1 /* -----------------------------------------------------------------------------
3 * (c) The GHC Team, 2000-2004
7 * ---------------------------------------------------------------------------*/
10 #include "PosixSource.h"
13 /* Linux needs _GNU_SOURCE to get RTLD_DEFAULT from <dlfcn.h> and
14 MREMAP_MAYMOVE from <sys/mman.h>.
25 #include "LinkerInternals.h"
29 #include "RtsGlobals.h"
33 #ifdef HAVE_SYS_TYPES_H
34 #include <sys/types.h>
40 #ifdef HAVE_SYS_STAT_H
44 #if defined(HAVE_DLFCN_H)
48 #if defined(cygwin32_HOST_OS)
53 #ifdef HAVE_SYS_TIME_H
57 #include <sys/fcntl.h>
58 #include <sys/termios.h>
59 #include <sys/utime.h>
60 #include <sys/utsname.h>
64 #if defined(ia64_HOST_ARCH) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
69 #if defined(linux_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
77 #if defined(linux_HOST_OS) || defined(solaris2_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
78 # define OBJFORMAT_ELF
79 #elif defined(cygwin32_HOST_OS) || defined (mingw32_HOST_OS)
80 # define OBJFORMAT_PEi386
83 #elif defined(darwin_HOST_OS)
84 # define OBJFORMAT_MACHO
85 # include <mach-o/loader.h>
86 # include <mach-o/nlist.h>
87 # include <mach-o/reloc.h>
88 #if !defined(HAVE_DLFCN_H)
89 # include <mach-o/dyld.h>
91 #if defined(powerpc_HOST_ARCH)
92 # include <mach-o/ppc/reloc.h>
94 #if defined(x86_64_HOST_ARCH)
95 # include <mach-o/x86_64/reloc.h>
99 /* Hash table mapping symbol names to Symbol */
100 static /*Str*/HashTable *symhash;
102 /* Hash table mapping symbol names to StgStablePtr */
103 static /*Str*/HashTable *stablehash;
105 /* List of currently loaded objects */
106 ObjectCode *objects = NULL; /* initially empty */
108 #if defined(OBJFORMAT_ELF)
109 static int ocVerifyImage_ELF ( ObjectCode* oc );
110 static int ocGetNames_ELF ( ObjectCode* oc );
111 static int ocResolve_ELF ( ObjectCode* oc );
112 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
113 static int ocAllocateSymbolExtras_ELF ( ObjectCode* oc );
115 #elif defined(OBJFORMAT_PEi386)
116 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
117 static int ocGetNames_PEi386 ( ObjectCode* oc );
118 static int ocResolve_PEi386 ( ObjectCode* oc );
119 static void *lookupSymbolInDLLs ( unsigned char *lbl );
120 static void zapTrailingAtSign ( unsigned char *sym );
121 #elif defined(OBJFORMAT_MACHO)
122 static int ocVerifyImage_MachO ( ObjectCode* oc );
123 static int ocGetNames_MachO ( ObjectCode* oc );
124 static int ocResolve_MachO ( ObjectCode* oc );
126 static int machoGetMisalignment( FILE * );
127 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
128 static int ocAllocateSymbolExtras_MachO ( ObjectCode* oc );
130 #ifdef powerpc_HOST_ARCH
131 static void machoInitSymbolsWithoutUnderscore( void );
135 /* on x86_64 we have a problem with relocating symbol references in
136 * code that was compiled without -fPIC. By default, the small memory
137 * model is used, which assumes that symbol references can fit in a
138 * 32-bit slot. The system dynamic linker makes this work for
139 * references to shared libraries by either (a) allocating a jump
140 * table slot for code references, or (b) moving the symbol at load
141 * time (and copying its contents, if necessary) for data references.
143 * We unfortunately can't tell whether symbol references are to code
144 * or data. So for now we assume they are code (the vast majority
145 * are), and allocate jump-table slots. Unfortunately this will
146 * SILENTLY generate crashing code for data references. This hack is
147 * enabled by X86_64_ELF_NONPIC_HACK.
149 * One workaround is to use shared Haskell libraries. This is
150 * coming. Another workaround is to keep the static libraries but
151 * compile them with -fPIC, because that will generate PIC references
152 * to data which can be relocated. The PIC code is still too green to
153 * do this systematically, though.
156 * See thread http://www.haskell.org/pipermail/cvs-ghc/2007-September/038458.html
158 * Naming Scheme for Symbol Macros
160 * SymI_*: symbol is internal to the RTS. It resides in an object
161 * file/library that is statically.
162 * SymE_*: symbol is external to the RTS library. It might be linked
165 * Sym*_HasProto : the symbol prototype is imported in an include file
166 * or defined explicitly
167 * Sym*_NeedsProto: the symbol is undefined and we add a dummy
168 * default proto extern void sym(void);
170 #define X86_64_ELF_NONPIC_HACK 1
172 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
173 * small memory model on this architecture (see gcc docs,
176 * MAP_32BIT not available on OpenBSD/amd64
178 #if defined(x86_64_HOST_ARCH) && defined(MAP_32BIT)
179 #define TRY_MAP_32BIT MAP_32BIT
181 #define TRY_MAP_32BIT 0
185 * Due to the small memory model (see above), on x86_64 we have to map
186 * all our non-PIC object files into the low 2Gb of the address space
187 * (why 2Gb and not 4Gb? Because all addresses must be reachable
188 * using a 32-bit signed PC-relative offset). On Linux we can do this
189 * using the MAP_32BIT flag to mmap(), however on other OSs
190 * (e.g. *BSD, see #2063, and also on Linux inside Xen, see #2512), we
191 * can't do this. So on these systems, we have to pick a base address
192 * in the low 2Gb of the address space and try to allocate memory from
195 * We pick a default address based on the OS, but also make this
196 * configurable via an RTS flag (+RTS -xm)
198 #if defined(x86_64_HOST_ARCH)
200 #if defined(MAP_32BIT)
201 // Try to use MAP_32BIT
202 #define MMAP_32BIT_BASE_DEFAULT 0
205 #define MMAP_32BIT_BASE_DEFAULT 0x40000000
208 static void *mmap_32bit_base = (void *)MMAP_32BIT_BASE_DEFAULT;
211 /* MAP_ANONYMOUS is MAP_ANON on some systems, e.g. OpenBSD */
212 #if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
213 #define MAP_ANONYMOUS MAP_ANON
216 /* -----------------------------------------------------------------------------
217 * Built-in symbols from the RTS
220 typedef struct _RtsSymbolVal {
225 #define Maybe_Stable_Names SymI_HasProto(mkWeakzh_fast) \
226 SymI_HasProto(mkWeakForeignEnvzh_fast) \
227 SymI_HasProto(makeStableNamezh_fast) \
228 SymI_HasProto(finalizzeWeakzh_fast)
230 #if !defined (mingw32_HOST_OS)
231 #define RTS_POSIX_ONLY_SYMBOLS \
232 SymI_HasProto(shutdownHaskellAndSignal) \
233 SymI_NeedsProto(lockFile) \
234 SymI_NeedsProto(unlockFile) \
235 SymI_HasProto(signal_handlers) \
236 SymI_HasProto(stg_sig_install) \
237 SymI_NeedsProto(nocldstop)
240 #if defined (cygwin32_HOST_OS)
241 #define RTS_MINGW_ONLY_SYMBOLS /**/
242 /* Don't have the ability to read import libs / archives, so
243 * we have to stupidly list a lot of what libcygwin.a
246 #define RTS_CYGWIN_ONLY_SYMBOLS \
247 SymI_HasProto(regfree) \
248 SymI_HasProto(regexec) \
249 SymI_HasProto(regerror) \
250 SymI_HasProto(regcomp) \
251 SymI_HasProto(__errno) \
252 SymI_HasProto(access) \
253 SymI_HasProto(chmod) \
254 SymI_HasProto(chdir) \
255 SymI_HasProto(close) \
256 SymI_HasProto(creat) \
258 SymI_HasProto(dup2) \
259 SymI_HasProto(fstat) \
260 SymI_HasProto(fcntl) \
261 SymI_HasProto(getcwd) \
262 SymI_HasProto(getenv) \
263 SymI_HasProto(lseek) \
264 SymI_HasProto(open) \
265 SymI_HasProto(fpathconf) \
266 SymI_HasProto(pathconf) \
267 SymI_HasProto(stat) \
269 SymI_HasProto(tanh) \
270 SymI_HasProto(cosh) \
271 SymI_HasProto(sinh) \
272 SymI_HasProto(atan) \
273 SymI_HasProto(acos) \
274 SymI_HasProto(asin) \
280 SymI_HasProto(sqrt) \
281 SymI_HasProto(localtime_r) \
282 SymI_HasProto(gmtime_r) \
283 SymI_HasProto(mktime) \
284 SymI_NeedsProto(_imp___tzname) \
285 SymI_HasProto(gettimeofday) \
286 SymI_HasProto(timezone) \
287 SymI_HasProto(tcgetattr) \
288 SymI_HasProto(tcsetattr) \
289 SymI_HasProto(memcpy) \
290 SymI_HasProto(memmove) \
291 SymI_HasProto(realloc) \
292 SymI_HasProto(malloc) \
293 SymI_HasProto(free) \
294 SymI_HasProto(fork) \
295 SymI_HasProto(lstat) \
296 SymI_HasProto(isatty) \
297 SymI_HasProto(mkdir) \
298 SymI_HasProto(opendir) \
299 SymI_HasProto(readdir) \
300 SymI_HasProto(rewinddir) \
301 SymI_HasProto(closedir) \
302 SymI_HasProto(link) \
303 SymI_HasProto(mkfifo) \
304 SymI_HasProto(pipe) \
305 SymI_HasProto(read) \
306 SymI_HasProto(rename) \
307 SymI_HasProto(rmdir) \
308 SymI_HasProto(select) \
309 SymI_HasProto(system) \
310 SymI_HasProto(write) \
311 SymI_HasProto(strcmp) \
312 SymI_HasProto(strcpy) \
313 SymI_HasProto(strncpy) \
314 SymI_HasProto(strerror) \
315 SymI_HasProto(sigaddset) \
316 SymI_HasProto(sigemptyset) \
317 SymI_HasProto(sigprocmask) \
318 SymI_HasProto(umask) \
319 SymI_HasProto(uname) \
320 SymI_HasProto(unlink) \
321 SymI_HasProto(utime) \
322 SymI_HasProto(waitpid)
324 #elif !defined(mingw32_HOST_OS)
325 #define RTS_MINGW_ONLY_SYMBOLS /**/
326 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
327 #else /* defined(mingw32_HOST_OS) */
328 #define RTS_POSIX_ONLY_SYMBOLS /**/
329 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
331 /* Extra syms gen'ed by mingw-2's gcc-3.2: */
333 #define RTS_MINGW_EXTRA_SYMS \
334 SymI_NeedsProto(_imp____mb_cur_max) \
335 SymI_NeedsProto(_imp___pctype)
337 #define RTS_MINGW_EXTRA_SYMS
340 #if HAVE_GETTIMEOFDAY
341 #define RTS_MINGW_GETTIMEOFDAY_SYM SymI_NeedsProto(gettimeofday)
343 #define RTS_MINGW_GETTIMEOFDAY_SYM /**/
346 /* These are statically linked from the mingw libraries into the ghc
347 executable, so we have to employ this hack. */
348 #define RTS_MINGW_ONLY_SYMBOLS \
349 SymI_HasProto(asyncReadzh_fast) \
350 SymI_HasProto(asyncWritezh_fast) \
351 SymI_HasProto(asyncDoProczh_fast) \
352 SymI_HasProto(memset) \
353 SymI_HasProto(inet_ntoa) \
354 SymI_HasProto(inet_addr) \
355 SymI_HasProto(htonl) \
356 SymI_HasProto(recvfrom) \
357 SymI_HasProto(listen) \
358 SymI_HasProto(bind) \
359 SymI_HasProto(shutdown) \
360 SymI_HasProto(connect) \
361 SymI_HasProto(htons) \
362 SymI_HasProto(ntohs) \
363 SymI_HasProto(getservbyname) \
364 SymI_HasProto(getservbyport) \
365 SymI_HasProto(getprotobynumber) \
366 SymI_HasProto(getprotobyname) \
367 SymI_HasProto(gethostbyname) \
368 SymI_HasProto(gethostbyaddr) \
369 SymI_HasProto(gethostname) \
370 SymI_HasProto(strcpy) \
371 SymI_HasProto(strncpy) \
372 SymI_HasProto(abort) \
373 SymI_NeedsProto(_alloca) \
374 SymI_NeedsProto(isxdigit) \
375 SymI_NeedsProto(isupper) \
376 SymI_NeedsProto(ispunct) \
377 SymI_NeedsProto(islower) \
378 SymI_NeedsProto(isspace) \
379 SymI_NeedsProto(isprint) \
380 SymI_NeedsProto(isdigit) \
381 SymI_NeedsProto(iscntrl) \
382 SymI_NeedsProto(isalpha) \
383 SymI_NeedsProto(isalnum) \
384 SymI_HasProto(strcmp) \
385 SymI_HasProto(memmove) \
386 SymI_HasProto(realloc) \
387 SymI_HasProto(malloc) \
389 SymI_HasProto(tanh) \
390 SymI_HasProto(cosh) \
391 SymI_HasProto(sinh) \
392 SymI_HasProto(atan) \
393 SymI_HasProto(acos) \
394 SymI_HasProto(asin) \
400 SymI_HasProto(sqrt) \
401 SymI_HasProto(powf) \
402 SymI_HasProto(tanhf) \
403 SymI_HasProto(coshf) \
404 SymI_HasProto(sinhf) \
405 SymI_HasProto(atanf) \
406 SymI_HasProto(acosf) \
407 SymI_HasProto(asinf) \
408 SymI_HasProto(tanf) \
409 SymI_HasProto(cosf) \
410 SymI_HasProto(sinf) \
411 SymI_HasProto(expf) \
412 SymI_HasProto(logf) \
413 SymI_HasProto(sqrtf) \
414 SymI_HasProto(memcpy) \
415 SymI_HasProto(rts_InstallConsoleEvent) \
416 SymI_HasProto(rts_ConsoleHandlerDone) \
417 SymI_NeedsProto(mktime) \
418 SymI_NeedsProto(_imp___timezone) \
419 SymI_NeedsProto(_imp___tzname) \
420 SymI_NeedsProto(_imp__tzname) \
421 SymI_NeedsProto(_imp___iob) \
422 SymI_NeedsProto(_imp___osver) \
423 SymI_NeedsProto(localtime) \
424 SymI_NeedsProto(gmtime) \
425 SymI_NeedsProto(opendir) \
426 SymI_NeedsProto(readdir) \
427 SymI_NeedsProto(rewinddir) \
428 RTS_MINGW_EXTRA_SYMS \
429 RTS_MINGW_GETTIMEOFDAY_SYM \
430 SymI_NeedsProto(closedir)
433 #if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
434 #define RTS_DARWIN_ONLY_SYMBOLS \
435 SymI_NeedsProto(asprintf$LDBLStub) \
436 SymI_NeedsProto(err$LDBLStub) \
437 SymI_NeedsProto(errc$LDBLStub) \
438 SymI_NeedsProto(errx$LDBLStub) \
439 SymI_NeedsProto(fprintf$LDBLStub) \
440 SymI_NeedsProto(fscanf$LDBLStub) \
441 SymI_NeedsProto(fwprintf$LDBLStub) \
442 SymI_NeedsProto(fwscanf$LDBLStub) \
443 SymI_NeedsProto(printf$LDBLStub) \
444 SymI_NeedsProto(scanf$LDBLStub) \
445 SymI_NeedsProto(snprintf$LDBLStub) \
446 SymI_NeedsProto(sprintf$LDBLStub) \
447 SymI_NeedsProto(sscanf$LDBLStub) \
448 SymI_NeedsProto(strtold$LDBLStub) \
449 SymI_NeedsProto(swprintf$LDBLStub) \
450 SymI_NeedsProto(swscanf$LDBLStub) \
451 SymI_NeedsProto(syslog$LDBLStub) \
452 SymI_NeedsProto(vasprintf$LDBLStub) \
453 SymI_NeedsProto(verr$LDBLStub) \
454 SymI_NeedsProto(verrc$LDBLStub) \
455 SymI_NeedsProto(verrx$LDBLStub) \
456 SymI_NeedsProto(vfprintf$LDBLStub) \
457 SymI_NeedsProto(vfscanf$LDBLStub) \
458 SymI_NeedsProto(vfwprintf$LDBLStub) \
459 SymI_NeedsProto(vfwscanf$LDBLStub) \
460 SymI_NeedsProto(vprintf$LDBLStub) \
461 SymI_NeedsProto(vscanf$LDBLStub) \
462 SymI_NeedsProto(vsnprintf$LDBLStub) \
463 SymI_NeedsProto(vsprintf$LDBLStub) \
464 SymI_NeedsProto(vsscanf$LDBLStub) \
465 SymI_NeedsProto(vswprintf$LDBLStub) \
466 SymI_NeedsProto(vswscanf$LDBLStub) \
467 SymI_NeedsProto(vsyslog$LDBLStub) \
468 SymI_NeedsProto(vwarn$LDBLStub) \
469 SymI_NeedsProto(vwarnc$LDBLStub) \
470 SymI_NeedsProto(vwarnx$LDBLStub) \
471 SymI_NeedsProto(vwprintf$LDBLStub) \
472 SymI_NeedsProto(vwscanf$LDBLStub) \
473 SymI_NeedsProto(warn$LDBLStub) \
474 SymI_NeedsProto(warnc$LDBLStub) \
475 SymI_NeedsProto(warnx$LDBLStub) \
476 SymI_NeedsProto(wcstold$LDBLStub) \
477 SymI_NeedsProto(wprintf$LDBLStub) \
478 SymI_NeedsProto(wscanf$LDBLStub)
480 #define RTS_DARWIN_ONLY_SYMBOLS
484 # define MAIN_CAP_SYM SymI_HasProto(MainCapability)
486 # define MAIN_CAP_SYM
489 #if !defined(mingw32_HOST_OS)
490 #define RTS_USER_SIGNALS_SYMBOLS \
491 SymI_HasProto(setIOManagerPipe) \
492 SymI_NeedsProto(blockUserSignals) \
493 SymI_NeedsProto(unblockUserSignals)
495 #define RTS_USER_SIGNALS_SYMBOLS \
496 SymI_HasProto(sendIOManagerEvent) \
497 SymI_HasProto(readIOManagerEvent) \
498 SymI_HasProto(getIOManagerEvent) \
499 SymI_HasProto(console_handler)
502 #define RTS_LIBFFI_SYMBOLS \
503 SymE_NeedsProto(ffi_prep_cif) \
504 SymE_NeedsProto(ffi_call) \
505 SymE_NeedsProto(ffi_type_void) \
506 SymE_NeedsProto(ffi_type_float) \
507 SymE_NeedsProto(ffi_type_double) \
508 SymE_NeedsProto(ffi_type_sint64) \
509 SymE_NeedsProto(ffi_type_uint64) \
510 SymE_NeedsProto(ffi_type_sint32) \
511 SymE_NeedsProto(ffi_type_uint32) \
512 SymE_NeedsProto(ffi_type_sint16) \
513 SymE_NeedsProto(ffi_type_uint16) \
514 SymE_NeedsProto(ffi_type_sint8) \
515 SymE_NeedsProto(ffi_type_uint8) \
516 SymE_NeedsProto(ffi_type_pointer)
518 #ifdef TABLES_NEXT_TO_CODE
519 #define RTS_RET_SYMBOLS /* nothing */
521 #define RTS_RET_SYMBOLS \
522 SymI_HasProto(stg_enter_ret) \
523 SymI_HasProto(stg_gc_fun_ret) \
524 SymI_HasProto(stg_ap_v_ret) \
525 SymI_HasProto(stg_ap_f_ret) \
526 SymI_HasProto(stg_ap_d_ret) \
527 SymI_HasProto(stg_ap_l_ret) \
528 SymI_HasProto(stg_ap_n_ret) \
529 SymI_HasProto(stg_ap_p_ret) \
530 SymI_HasProto(stg_ap_pv_ret) \
531 SymI_HasProto(stg_ap_pp_ret) \
532 SymI_HasProto(stg_ap_ppv_ret) \
533 SymI_HasProto(stg_ap_ppp_ret) \
534 SymI_HasProto(stg_ap_pppv_ret) \
535 SymI_HasProto(stg_ap_pppp_ret) \
536 SymI_HasProto(stg_ap_ppppp_ret) \
537 SymI_HasProto(stg_ap_pppppp_ret)
540 /* On Windows, we link libgmp.a statically into libHSrts.dll */
541 #ifdef mingw32_HOST_OS
543 SymI_HasProto(__gmpz_cmp) \
544 SymI_HasProto(__gmpz_cmp_si) \
545 SymI_HasProto(__gmpz_cmp_ui) \
546 SymI_HasProto(__gmpz_get_si) \
547 SymI_HasProto(__gmpz_get_ui)
550 SymE_HasProto(__gmpz_cmp) \
551 SymE_HasProto(__gmpz_cmp_si) \
552 SymE_HasProto(__gmpz_cmp_ui) \
553 SymE_HasProto(__gmpz_get_si) \
554 SymE_HasProto(__gmpz_get_ui)
557 #define RTS_SYMBOLS \
559 SymI_HasProto(StgReturn) \
560 SymI_HasProto(stg_enter_info) \
561 SymI_HasProto(stg_gc_void_info) \
562 SymI_HasProto(__stg_gc_enter_1) \
563 SymI_HasProto(stg_gc_noregs) \
564 SymI_HasProto(stg_gc_unpt_r1_info) \
565 SymI_HasProto(stg_gc_unpt_r1) \
566 SymI_HasProto(stg_gc_unbx_r1_info) \
567 SymI_HasProto(stg_gc_unbx_r1) \
568 SymI_HasProto(stg_gc_f1_info) \
569 SymI_HasProto(stg_gc_f1) \
570 SymI_HasProto(stg_gc_d1_info) \
571 SymI_HasProto(stg_gc_d1) \
572 SymI_HasProto(stg_gc_l1_info) \
573 SymI_HasProto(stg_gc_l1) \
574 SymI_HasProto(__stg_gc_fun) \
575 SymI_HasProto(stg_gc_fun_info) \
576 SymI_HasProto(stg_gc_gen) \
577 SymI_HasProto(stg_gc_gen_info) \
578 SymI_HasProto(stg_gc_gen_hp) \
579 SymI_HasProto(stg_gc_ut) \
580 SymI_HasProto(stg_gen_yield) \
581 SymI_HasProto(stg_yield_noregs) \
582 SymI_HasProto(stg_yield_to_interpreter) \
583 SymI_HasProto(stg_gen_block) \
584 SymI_HasProto(stg_block_noregs) \
585 SymI_HasProto(stg_block_1) \
586 SymI_HasProto(stg_block_takemvar) \
587 SymI_HasProto(stg_block_putmvar) \
589 SymI_HasProto(MallocFailHook) \
590 SymI_HasProto(OnExitHook) \
591 SymI_HasProto(OutOfHeapHook) \
592 SymI_HasProto(StackOverflowHook) \
593 SymI_HasProto(addDLL) \
595 SymI_HasProto(__int_encodeDouble) \
596 SymI_HasProto(__word_encodeDouble) \
597 SymI_HasProto(__2Int_encodeDouble) \
598 SymI_HasProto(__int_encodeFloat) \
599 SymI_HasProto(__word_encodeFloat) \
600 SymI_HasProto(andIntegerzh_fast) \
601 SymI_HasProto(atomicallyzh_fast) \
602 SymI_HasProto(barf) \
603 SymI_HasProto(debugBelch) \
604 SymI_HasProto(errorBelch) \
605 SymI_HasProto(sysErrorBelch) \
606 SymI_HasProto(asyncExceptionsBlockedzh_fast) \
607 SymI_HasProto(blockAsyncExceptionszh_fast) \
608 SymI_HasProto(catchzh_fast) \
609 SymI_HasProto(catchRetryzh_fast) \
610 SymI_HasProto(catchSTMzh_fast) \
611 SymI_HasProto(checkzh_fast) \
612 SymI_HasProto(closure_flags) \
613 SymI_HasProto(cmp_thread) \
614 SymI_HasProto(cmpIntegerzh_fast) \
615 SymI_HasProto(cmpIntegerIntzh_fast) \
616 SymI_HasProto(complementIntegerzh_fast) \
617 SymI_HasProto(createAdjustor) \
618 SymI_HasProto(decodeDoublezh_fast) \
619 SymI_HasProto(decodeDoublezu2Intzh_fast) \
620 SymI_HasProto(decodeFloatzuIntzh_fast) \
621 SymI_HasProto(defaultsHook) \
622 SymI_HasProto(delayzh_fast) \
623 SymI_HasProto(deRefWeakzh_fast) \
624 SymI_HasProto(deRefStablePtrzh_fast) \
625 SymI_HasProto(dirty_MUT_VAR) \
626 SymI_HasProto(divExactIntegerzh_fast) \
627 SymI_HasProto(divModIntegerzh_fast) \
628 SymI_HasProto(forkzh_fast) \
629 SymI_HasProto(forkOnzh_fast) \
630 SymI_HasProto(forkProcess) \
631 SymI_HasProto(forkOS_createThread) \
632 SymI_HasProto(freeHaskellFunctionPtr) \
633 SymI_HasProto(freeStablePtr) \
634 SymI_HasProto(getOrSetTypeableStore) \
635 SymI_HasProto(getOrSetSignalHandlerStore) \
636 SymI_HasProto(gcdIntegerzh_fast) \
637 SymI_HasProto(gcdIntegerIntzh_fast) \
638 SymI_HasProto(gcdIntzh_fast) \
639 SymI_HasProto(genSymZh) \
640 SymI_HasProto(genericRaise) \
641 SymI_HasProto(getProgArgv) \
642 SymI_HasProto(getFullProgArgv) \
643 SymI_HasProto(getStablePtr) \
644 SymI_HasProto(hs_init) \
645 SymI_HasProto(hs_exit) \
646 SymI_HasProto(hs_set_argv) \
647 SymI_HasProto(hs_add_root) \
648 SymI_HasProto(hs_perform_gc) \
649 SymI_HasProto(hs_free_stable_ptr) \
650 SymI_HasProto(hs_free_fun_ptr) \
651 SymI_HasProto(hs_hpc_rootModule) \
652 SymI_HasProto(hs_hpc_module) \
653 SymI_HasProto(initLinker) \
654 SymI_HasProto(unpackClosurezh_fast) \
655 SymI_HasProto(getApStackValzh_fast) \
656 SymI_HasProto(getSparkzh_fast) \
657 SymI_HasProto(int2Integerzh_fast) \
658 SymI_HasProto(integer2Intzh_fast) \
659 SymI_HasProto(integer2Wordzh_fast) \
660 SymI_HasProto(isCurrentThreadBoundzh_fast) \
661 SymI_HasProto(isDoubleDenormalized) \
662 SymI_HasProto(isDoubleInfinite) \
663 SymI_HasProto(isDoubleNaN) \
664 SymI_HasProto(isDoubleNegativeZero) \
665 SymI_HasProto(isEmptyMVarzh_fast) \
666 SymI_HasProto(isFloatDenormalized) \
667 SymI_HasProto(isFloatInfinite) \
668 SymI_HasProto(isFloatNaN) \
669 SymI_HasProto(isFloatNegativeZero) \
670 SymI_HasProto(killThreadzh_fast) \
671 SymI_HasProto(loadObj) \
672 SymI_HasProto(insertStableSymbol) \
673 SymI_HasProto(insertSymbol) \
674 SymI_HasProto(lookupSymbol) \
675 SymI_HasProto(makeStablePtrzh_fast) \
676 SymI_HasProto(minusIntegerzh_fast) \
677 SymI_HasProto(mkApUpd0zh_fast) \
678 SymI_HasProto(myThreadIdzh_fast) \
679 SymI_HasProto(labelThreadzh_fast) \
680 SymI_HasProto(newArrayzh_fast) \
681 SymI_HasProto(newBCOzh_fast) \
682 SymI_HasProto(newByteArrayzh_fast) \
683 SymI_HasProto_redirect(newCAF, newDynCAF) \
684 SymI_HasProto(newMVarzh_fast) \
685 SymI_HasProto(newMutVarzh_fast) \
686 SymI_HasProto(newTVarzh_fast) \
687 SymI_HasProto(noDuplicatezh_fast) \
688 SymI_HasProto(atomicModifyMutVarzh_fast) \
689 SymI_HasProto(newPinnedByteArrayzh_fast) \
690 SymI_HasProto(newAlignedPinnedByteArrayzh_fast) \
691 SymI_HasProto(newSpark) \
692 SymI_HasProto(orIntegerzh_fast) \
693 SymI_HasProto(performGC) \
694 SymI_HasProto(performMajorGC) \
695 SymI_HasProto(plusIntegerzh_fast) \
696 SymI_HasProto(prog_argc) \
697 SymI_HasProto(prog_argv) \
698 SymI_HasProto(putMVarzh_fast) \
699 SymI_HasProto(quotIntegerzh_fast) \
700 SymI_HasProto(quotRemIntegerzh_fast) \
701 SymI_HasProto(raisezh_fast) \
702 SymI_HasProto(raiseIOzh_fast) \
703 SymI_HasProto(readTVarzh_fast) \
704 SymI_HasProto(readTVarIOzh_fast) \
705 SymI_HasProto(remIntegerzh_fast) \
706 SymI_HasProto(resetNonBlockingFd) \
707 SymI_HasProto(resumeThread) \
708 SymI_HasProto(resolveObjs) \
709 SymI_HasProto(retryzh_fast) \
710 SymI_HasProto(rts_apply) \
711 SymI_HasProto(rts_checkSchedStatus) \
712 SymI_HasProto(rts_eval) \
713 SymI_HasProto(rts_evalIO) \
714 SymI_HasProto(rts_evalLazyIO) \
715 SymI_HasProto(rts_evalStableIO) \
716 SymI_HasProto(rts_eval_) \
717 SymI_HasProto(rts_getBool) \
718 SymI_HasProto(rts_getChar) \
719 SymI_HasProto(rts_getDouble) \
720 SymI_HasProto(rts_getFloat) \
721 SymI_HasProto(rts_getInt) \
722 SymI_HasProto(rts_getInt8) \
723 SymI_HasProto(rts_getInt16) \
724 SymI_HasProto(rts_getInt32) \
725 SymI_HasProto(rts_getInt64) \
726 SymI_HasProto(rts_getPtr) \
727 SymI_HasProto(rts_getFunPtr) \
728 SymI_HasProto(rts_getStablePtr) \
729 SymI_HasProto(rts_getThreadId) \
730 SymI_HasProto(rts_getWord) \
731 SymI_HasProto(rts_getWord8) \
732 SymI_HasProto(rts_getWord16) \
733 SymI_HasProto(rts_getWord32) \
734 SymI_HasProto(rts_getWord64) \
735 SymI_HasProto(rts_lock) \
736 SymI_HasProto(rts_mkBool) \
737 SymI_HasProto(rts_mkChar) \
738 SymI_HasProto(rts_mkDouble) \
739 SymI_HasProto(rts_mkFloat) \
740 SymI_HasProto(rts_mkInt) \
741 SymI_HasProto(rts_mkInt8) \
742 SymI_HasProto(rts_mkInt16) \
743 SymI_HasProto(rts_mkInt32) \
744 SymI_HasProto(rts_mkInt64) \
745 SymI_HasProto(rts_mkPtr) \
746 SymI_HasProto(rts_mkFunPtr) \
747 SymI_HasProto(rts_mkStablePtr) \
748 SymI_HasProto(rts_mkString) \
749 SymI_HasProto(rts_mkWord) \
750 SymI_HasProto(rts_mkWord8) \
751 SymI_HasProto(rts_mkWord16) \
752 SymI_HasProto(rts_mkWord32) \
753 SymI_HasProto(rts_mkWord64) \
754 SymI_HasProto(rts_unlock) \
755 SymI_HasProto(rts_unsafeGetMyCapability) \
756 SymI_HasProto(rtsSupportsBoundThreads) \
757 SymI_HasProto(__hscore_get_saved_termios) \
758 SymI_HasProto(__hscore_set_saved_termios) \
759 SymI_HasProto(setProgArgv) \
760 SymI_HasProto(startupHaskell) \
761 SymI_HasProto(shutdownHaskell) \
762 SymI_HasProto(shutdownHaskellAndExit) \
763 SymI_HasProto(stable_ptr_table) \
764 SymI_HasProto(stackOverflow) \
765 SymI_HasProto(stg_CAF_BLACKHOLE_info) \
766 SymI_HasProto(__stg_EAGER_BLACKHOLE_info) \
767 SymI_HasProto(awakenBlockedQueue) \
768 SymI_HasProto(startTimer) \
769 SymI_HasProto(stg_CHARLIKE_closure) \
770 SymI_HasProto(stg_MVAR_CLEAN_info) \
771 SymI_HasProto(stg_MVAR_DIRTY_info) \
772 SymI_HasProto(stg_IND_STATIC_info) \
773 SymI_HasProto(stg_INTLIKE_closure) \
774 SymI_HasProto(stg_ARR_WORDS_info) \
775 SymI_HasProto(stg_MUT_ARR_PTRS_DIRTY_info) \
776 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN_info) \
777 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN0_info) \
778 SymI_HasProto(stg_WEAK_info) \
779 SymI_HasProto(stg_ap_v_info) \
780 SymI_HasProto(stg_ap_f_info) \
781 SymI_HasProto(stg_ap_d_info) \
782 SymI_HasProto(stg_ap_l_info) \
783 SymI_HasProto(stg_ap_n_info) \
784 SymI_HasProto(stg_ap_p_info) \
785 SymI_HasProto(stg_ap_pv_info) \
786 SymI_HasProto(stg_ap_pp_info) \
787 SymI_HasProto(stg_ap_ppv_info) \
788 SymI_HasProto(stg_ap_ppp_info) \
789 SymI_HasProto(stg_ap_pppv_info) \
790 SymI_HasProto(stg_ap_pppp_info) \
791 SymI_HasProto(stg_ap_ppppp_info) \
792 SymI_HasProto(stg_ap_pppppp_info) \
793 SymI_HasProto(stg_ap_0_fast) \
794 SymI_HasProto(stg_ap_v_fast) \
795 SymI_HasProto(stg_ap_f_fast) \
796 SymI_HasProto(stg_ap_d_fast) \
797 SymI_HasProto(stg_ap_l_fast) \
798 SymI_HasProto(stg_ap_n_fast) \
799 SymI_HasProto(stg_ap_p_fast) \
800 SymI_HasProto(stg_ap_pv_fast) \
801 SymI_HasProto(stg_ap_pp_fast) \
802 SymI_HasProto(stg_ap_ppv_fast) \
803 SymI_HasProto(stg_ap_ppp_fast) \
804 SymI_HasProto(stg_ap_pppv_fast) \
805 SymI_HasProto(stg_ap_pppp_fast) \
806 SymI_HasProto(stg_ap_ppppp_fast) \
807 SymI_HasProto(stg_ap_pppppp_fast) \
808 SymI_HasProto(stg_ap_1_upd_info) \
809 SymI_HasProto(stg_ap_2_upd_info) \
810 SymI_HasProto(stg_ap_3_upd_info) \
811 SymI_HasProto(stg_ap_4_upd_info) \
812 SymI_HasProto(stg_ap_5_upd_info) \
813 SymI_HasProto(stg_ap_6_upd_info) \
814 SymI_HasProto(stg_ap_7_upd_info) \
815 SymI_HasProto(stg_exit) \
816 SymI_HasProto(stg_sel_0_upd_info) \
817 SymI_HasProto(stg_sel_10_upd_info) \
818 SymI_HasProto(stg_sel_11_upd_info) \
819 SymI_HasProto(stg_sel_12_upd_info) \
820 SymI_HasProto(stg_sel_13_upd_info) \
821 SymI_HasProto(stg_sel_14_upd_info) \
822 SymI_HasProto(stg_sel_15_upd_info) \
823 SymI_HasProto(stg_sel_1_upd_info) \
824 SymI_HasProto(stg_sel_2_upd_info) \
825 SymI_HasProto(stg_sel_3_upd_info) \
826 SymI_HasProto(stg_sel_4_upd_info) \
827 SymI_HasProto(stg_sel_5_upd_info) \
828 SymI_HasProto(stg_sel_6_upd_info) \
829 SymI_HasProto(stg_sel_7_upd_info) \
830 SymI_HasProto(stg_sel_8_upd_info) \
831 SymI_HasProto(stg_sel_9_upd_info) \
832 SymI_HasProto(stg_upd_frame_info) \
833 SymI_HasProto(suspendThread) \
834 SymI_HasProto(takeMVarzh_fast) \
835 SymI_HasProto(threadStatuszh_fast) \
836 SymI_HasProto(timesIntegerzh_fast) \
837 SymI_HasProto(tryPutMVarzh_fast) \
838 SymI_HasProto(tryTakeMVarzh_fast) \
839 SymI_HasProto(unblockAsyncExceptionszh_fast) \
840 SymI_HasProto(unloadObj) \
841 SymI_HasProto(unsafeThawArrayzh_fast) \
842 SymI_HasProto(waitReadzh_fast) \
843 SymI_HasProto(waitWritezh_fast) \
844 SymI_HasProto(word2Integerzh_fast) \
845 SymI_HasProto(writeTVarzh_fast) \
846 SymI_HasProto(xorIntegerzh_fast) \
847 SymI_HasProto(yieldzh_fast) \
848 SymI_NeedsProto(stg_interp_constr_entry) \
849 SymI_HasProto(alloc_blocks) \
850 SymI_HasProto(alloc_blocks_lim) \
851 SymI_HasProto(allocateLocal) \
852 SymI_HasProto(allocateExec) \
853 SymI_HasProto(freeExec) \
854 SymI_HasProto(getAllocations) \
855 SymI_HasProto(revertCAFs) \
856 SymI_HasProto(RtsFlags) \
857 SymI_NeedsProto(rts_breakpoint_io_action) \
858 SymI_NeedsProto(rts_stop_next_breakpoint) \
859 SymI_NeedsProto(rts_stop_on_exception) \
860 SymI_HasProto(stopTimer) \
861 SymI_HasProto(n_capabilities) \
862 SymI_HasProto(traceCcszh_fast) \
863 RTS_USER_SIGNALS_SYMBOLS
865 #ifdef SUPPORT_LONG_LONGS
866 #define RTS_LONG_LONG_SYMS \
867 SymI_HasProto(int64ToIntegerzh_fast) \
868 SymI_HasProto(word64ToIntegerzh_fast)
870 #define RTS_LONG_LONG_SYMS /* nothing */
873 // 64-bit support functions in libgcc.a
874 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
875 #define RTS_LIBGCC_SYMBOLS \
876 SymI_NeedsProto(__divdi3) \
877 SymI_NeedsProto(__udivdi3) \
878 SymI_NeedsProto(__moddi3) \
879 SymI_NeedsProto(__umoddi3) \
880 SymI_NeedsProto(__muldi3) \
881 SymI_NeedsProto(__ashldi3) \
882 SymI_NeedsProto(__ashrdi3) \
883 SymI_NeedsProto(__lshrdi3) \
884 SymI_NeedsProto(__eprintf)
885 #elif defined(ia64_HOST_ARCH)
886 #define RTS_LIBGCC_SYMBOLS \
887 SymI_NeedsProto(__divdi3) \
888 SymI_NeedsProto(__udivdi3) \
889 SymI_NeedsProto(__moddi3) \
890 SymI_NeedsProto(__umoddi3) \
891 SymI_NeedsProto(__divsf3) \
892 SymI_NeedsProto(__divdf3)
894 #define RTS_LIBGCC_SYMBOLS
897 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
898 // Symbols that don't have a leading underscore
899 // on Mac OS X. They have to receive special treatment,
900 // see machoInitSymbolsWithoutUnderscore()
901 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
902 SymI_NeedsProto(saveFP) \
903 SymI_NeedsProto(restFP)
906 /* entirely bogus claims about types of these symbols */
907 #define SymI_NeedsProto(vvv) extern void vvv(void);
908 #if defined(__PIC__) && defined(mingw32_TARGET_OS)
909 #define SymE_HasProto(vvv) SymE_HasProto(vvv);
910 #define SymE_NeedsProto(vvv) extern void _imp__ ## vvv (void);
912 #define SymE_NeedsProto(vvv) SymI_NeedsProto(vvv);
913 #define SymE_HasProto(vvv) SymI_HasProto(vvv)
915 #define SymI_HasProto(vvv) /**/
916 #define SymI_HasProto_redirect(vvv,xxx) /**/
920 RTS_POSIX_ONLY_SYMBOLS
921 RTS_MINGW_ONLY_SYMBOLS
922 RTS_CYGWIN_ONLY_SYMBOLS
923 RTS_DARWIN_ONLY_SYMBOLS
926 #undef SymI_NeedsProto
928 #undef SymI_HasProto_redirect
930 #undef SymE_NeedsProto
932 #ifdef LEADING_UNDERSCORE
933 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
935 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
938 #define SymI_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
940 #define SymE_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
941 (void*)DLL_IMPORT_DATA_REF(vvv) },
943 #define SymI_NeedsProto(vvv) SymI_HasProto(vvv)
944 #define SymE_NeedsProto(vvv) SymE_HasProto(vvv)
946 // SymI_HasProto_redirect allows us to redirect references to one symbol to
947 // another symbol. See newCAF/newDynCAF for an example.
948 #define SymI_HasProto_redirect(vvv,xxx) \
949 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
952 static RtsSymbolVal rtsSyms[] = {
956 RTS_POSIX_ONLY_SYMBOLS
957 RTS_MINGW_ONLY_SYMBOLS
958 RTS_CYGWIN_ONLY_SYMBOLS
959 RTS_DARWIN_ONLY_SYMBOLS
962 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
963 // dyld stub code contains references to this,
964 // but it should never be called because we treat
965 // lazy pointers as nonlazy.
966 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
968 { 0, 0 } /* sentinel */
973 /* -----------------------------------------------------------------------------
974 * Insert symbols into hash tables, checking for duplicates.
977 static void ghciInsertStrHashTable ( char* obj_name,
983 if (lookupHashTable(table, (StgWord)key) == NULL)
985 insertStrHashTable(table, (StgWord)key, data);
990 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
992 "whilst processing object file\n"
994 "This could be caused by:\n"
995 " * Loading two different object files which export the same symbol\n"
996 " * Specifying the same object file twice on the GHCi command line\n"
997 " * An incorrect `package.conf' entry, causing some object to be\n"
999 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
1006 /* -----------------------------------------------------------------------------
1007 * initialize the object linker
1011 static int linker_init_done = 0 ;
1013 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1014 static void *dl_prog_handle;
1022 /* Make initLinker idempotent, so we can call it
1023 before evey relevant operation; that means we
1024 don't need to initialise the linker separately */
1025 if (linker_init_done == 1) { return; } else {
1026 linker_init_done = 1;
1029 stablehash = allocStrHashTable();
1030 symhash = allocStrHashTable();
1032 /* populate the symbol table with stuff from the RTS */
1033 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
1034 ghciInsertStrHashTable("(GHCi built-in symbols)",
1035 symhash, sym->lbl, sym->addr);
1037 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1038 machoInitSymbolsWithoutUnderscore();
1041 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1042 # if defined(RTLD_DEFAULT)
1043 dl_prog_handle = RTLD_DEFAULT;
1045 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
1046 # endif /* RTLD_DEFAULT */
1049 #if defined(x86_64_HOST_ARCH)
1050 if (RtsFlags.MiscFlags.linkerMemBase != 0) {
1051 // User-override for mmap_32bit_base
1052 mmap_32bit_base = (void*)RtsFlags.MiscFlags.linkerMemBase;
1056 #if defined(mingw32_HOST_OS)
1058 * These two libraries cause problems when added to the static link,
1059 * but are necessary for resolving symbols in GHCi, hence we load
1060 * them manually here.
1067 /* -----------------------------------------------------------------------------
1068 * Loading DLL or .so dynamic libraries
1069 * -----------------------------------------------------------------------------
1071 * Add a DLL from which symbols may be found. In the ELF case, just
1072 * do RTLD_GLOBAL-style add, so no further messing around needs to
1073 * happen in order that symbols in the loaded .so are findable --
1074 * lookupSymbol() will subsequently see them by dlsym on the program's
1075 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
1077 * In the PEi386 case, open the DLLs and put handles to them in a
1078 * linked list. When looking for a symbol, try all handles in the
1079 * list. This means that we need to load even DLLs that are guaranteed
1080 * to be in the ghc.exe image already, just so we can get a handle
1081 * to give to loadSymbol, so that we can find the symbols. For such
1082 * libraries, the LoadLibrary call should be a no-op except for returning
1087 #if defined(OBJFORMAT_PEi386)
1088 /* A record for storing handles into DLLs. */
1093 struct _OpenedDLL* next;
1098 /* A list thereof. */
1099 static OpenedDLL* opened_dlls = NULL;
1103 addDLL( char *dll_name )
1105 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1106 /* ------------------- ELF DLL loader ------------------- */
1112 // omitted: RTLD_NOW
1113 // see http://www.haskell.org/pipermail/cvs-ghc/2007-September/038570.html
1114 hdl= dlopen(dll_name, RTLD_LAZY | RTLD_GLOBAL);
1117 /* dlopen failed; return a ptr to the error msg. */
1119 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1126 # elif defined(OBJFORMAT_PEi386)
1127 /* ------------------- Win32 DLL loader ------------------- */
1135 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1137 /* See if we've already got it, and ignore if so. */
1138 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1139 if (0 == strcmp(o_dll->name, dll_name))
1143 /* The file name has no suffix (yet) so that we can try
1144 both foo.dll and foo.drv
1146 The documentation for LoadLibrary says:
1147 If no file name extension is specified in the lpFileName
1148 parameter, the default library extension .dll is
1149 appended. However, the file name string can include a trailing
1150 point character (.) to indicate that the module name has no
1153 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1154 sprintf(buf, "%s.DLL", dll_name);
1155 instance = LoadLibrary(buf);
1156 if (instance == NULL) {
1157 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1158 // KAA: allow loading of drivers (like winspool.drv)
1159 sprintf(buf, "%s.DRV", dll_name);
1160 instance = LoadLibrary(buf);
1161 if (instance == NULL) {
1162 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1163 // #1883: allow loading of unix-style libfoo.dll DLLs
1164 sprintf(buf, "lib%s.DLL", dll_name);
1165 instance = LoadLibrary(buf);
1166 if (instance == NULL) {
1173 /* Add this DLL to the list of DLLs in which to search for symbols. */
1174 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1175 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1176 strcpy(o_dll->name, dll_name);
1177 o_dll->instance = instance;
1178 o_dll->next = opened_dlls;
1179 opened_dlls = o_dll;
1185 sysErrorBelch(dll_name);
1187 /* LoadLibrary failed; return a ptr to the error msg. */
1188 return "addDLL: could not load DLL";
1191 barf("addDLL: not implemented on this platform");
1195 /* -----------------------------------------------------------------------------
1196 * insert a stable symbol in the hash table
1200 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1202 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1206 /* -----------------------------------------------------------------------------
1207 * insert a symbol in the hash table
1210 insertSymbol(char* obj_name, char* key, void* data)
1212 ghciInsertStrHashTable(obj_name, symhash, key, data);
1215 /* -----------------------------------------------------------------------------
1216 * lookup a symbol in the hash table
1219 lookupSymbol( char *lbl )
1223 ASSERT(symhash != NULL);
1224 val = lookupStrHashTable(symhash, lbl);
1227 # if defined(OBJFORMAT_ELF)
1228 return dlsym(dl_prog_handle, lbl);
1229 # elif defined(OBJFORMAT_MACHO)
1231 /* On OS X 10.3 and later, we use dlsym instead of the old legacy
1234 HACK: On OS X, global symbols are prefixed with an underscore.
1235 However, dlsym wants us to omit the leading underscore from the
1236 symbol name. For now, we simply strip it off here (and ONLY
1239 ASSERT(lbl[0] == '_');
1240 return dlsym(dl_prog_handle, lbl+1);
1242 if(NSIsSymbolNameDefined(lbl)) {
1243 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1244 return NSAddressOfSymbol(symbol);
1248 # endif /* HAVE_DLFCN_H */
1249 # elif defined(OBJFORMAT_PEi386)
1252 sym = lookupSymbolInDLLs(lbl);
1253 if (sym != NULL) { return sym; };
1255 // Also try looking up the symbol without the @N suffix. Some
1256 // DLLs have the suffixes on their symbols, some don't.
1257 zapTrailingAtSign ( lbl );
1258 sym = lookupSymbolInDLLs(lbl);
1259 if (sym != NULL) { return sym; };
1271 /* -----------------------------------------------------------------------------
1272 * Debugging aid: look in GHCi's object symbol tables for symbols
1273 * within DELTA bytes of the specified address, and show their names.
1276 void ghci_enquire ( char* addr );
1278 void ghci_enquire ( char* addr )
1283 const int DELTA = 64;
1288 for (oc = objects; oc; oc = oc->next) {
1289 for (i = 0; i < oc->n_symbols; i++) {
1290 sym = oc->symbols[i];
1291 if (sym == NULL) continue;
1294 a = lookupStrHashTable(symhash, sym);
1297 // debugBelch("ghci_enquire: can't find %s\n", sym);
1299 else if (addr-DELTA <= a && a <= addr+DELTA) {
1300 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1307 #ifdef ia64_HOST_ARCH
1308 static unsigned int PLTSize(void);
1312 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1315 mmapForLinker (size_t bytes, nat flags, int fd)
1317 void *map_addr = NULL;
1320 static nat fixed = 0;
1322 pagesize = getpagesize();
1323 size = ROUND_UP(bytes, pagesize);
1325 #if defined(x86_64_HOST_ARCH)
1328 if (mmap_32bit_base != 0) {
1329 map_addr = mmap_32bit_base;
1333 result = mmap(map_addr, size, PROT_EXEC|PROT_READ|PROT_WRITE,
1334 MAP_PRIVATE|TRY_MAP_32BIT|fixed|flags, fd, 0);
1336 if (result == MAP_FAILED) {
1337 sysErrorBelch("mmap %lu bytes at %p",(lnat)size,map_addr);
1338 errorBelch("Try specifying an address with +RTS -xm<addr> -RTS");
1339 stg_exit(EXIT_FAILURE);
1342 #if defined(x86_64_HOST_ARCH)
1343 if (mmap_32bit_base != 0) {
1344 if (result == map_addr) {
1345 mmap_32bit_base = map_addr + size;
1347 if ((W_)result > 0x80000000) {
1348 // oops, we were given memory over 2Gb
1349 #if defined(freebsd_HOST_OS)
1350 // Some platforms require MAP_FIXED. This is normally
1351 // a bad idea, because MAP_FIXED will overwrite
1352 // existing mappings.
1353 munmap(result,size);
1357 barf("loadObj: failed to mmap() memory below 2Gb; asked for %lu bytes at %p. Try specifying an address with +RTS -xm<addr> -RTS", size, map_addr, result);
1360 // hmm, we were given memory somewhere else, but it's
1361 // still under 2Gb so we can use it. Next time, ask
1362 // for memory right after the place we just got some
1363 mmap_32bit_base = (void*)result + size;
1367 if ((W_)result > 0x80000000) {
1368 // oops, we were given memory over 2Gb
1369 // ... try allocating memory somewhere else?;
1370 debugTrace(DEBUG_linker,"MAP_32BIT didn't work; gave us %lu bytes at 0x%p", bytes, result);
1371 munmap(result, size);
1373 // Set a base address and try again... (guess: 1Gb)
1374 mmap_32bit_base = (void*)0x40000000;
1384 /* -----------------------------------------------------------------------------
1385 * Load an obj (populate the global symbol table, but don't resolve yet)
1387 * Returns: 1 if ok, 0 on error.
1390 loadObj( char *path )
1402 /* debugBelch("loadObj %s\n", path ); */
1404 /* Check that we haven't already loaded this object.
1405 Ignore requests to load multiple times */
1409 for (o = objects; o; o = o->next) {
1410 if (0 == strcmp(o->fileName, path)) {
1412 break; /* don't need to search further */
1416 IF_DEBUG(linker, debugBelch(
1417 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1418 "same object file twice:\n"
1420 "GHCi will ignore this, but be warned.\n"
1422 return 1; /* success */
1426 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1428 # if defined(OBJFORMAT_ELF)
1429 oc->formatName = "ELF";
1430 # elif defined(OBJFORMAT_PEi386)
1431 oc->formatName = "PEi386";
1432 # elif defined(OBJFORMAT_MACHO)
1433 oc->formatName = "Mach-O";
1436 barf("loadObj: not implemented on this platform");
1439 r = stat(path, &st);
1440 if (r == -1) { return 0; }
1442 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1443 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1444 strcpy(oc->fileName, path);
1446 oc->fileSize = st.st_size;
1448 oc->sections = NULL;
1449 oc->proddables = NULL;
1451 /* chain it onto the list of objects */
1456 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1458 #if defined(openbsd_HOST_OS)
1459 fd = open(path, O_RDONLY, S_IRUSR);
1461 fd = open(path, O_RDONLY);
1464 barf("loadObj: can't open `%s'", path);
1466 #ifdef ia64_HOST_ARCH
1467 /* The PLT needs to be right before the object */
1470 pagesize = getpagesize();
1471 n = ROUND_UP(PLTSize(), pagesize);
1472 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1473 if (oc->plt == MAP_FAILED)
1474 barf("loadObj: can't allocate PLT");
1477 map_addr = oc->plt + n;
1479 n = ROUND_UP(oc->fileSize, pagesize);
1480 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1481 MAP_PRIVATE|TRY_MAP_32BIT, fd, 0);
1482 if (oc->image == MAP_FAILED)
1483 barf("loadObj: can't map `%s'", path);
1486 oc->image = mmapForLinker(oc->fileSize, 0, fd);
1491 #else /* !USE_MMAP */
1492 /* load the image into memory */
1493 f = fopen(path, "rb");
1495 barf("loadObj: can't read `%s'", path);
1497 # if defined(mingw32_HOST_OS)
1498 // TODO: We would like to use allocateExec here, but allocateExec
1499 // cannot currently allocate blocks large enough.
1500 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1501 PAGE_EXECUTE_READWRITE);
1502 # elif defined(darwin_HOST_OS)
1503 // In a Mach-O .o file, all sections can and will be misaligned
1504 // if the total size of the headers is not a multiple of the
1505 // desired alignment. This is fine for .o files that only serve
1506 // as input for the static linker, but it's not fine for us,
1507 // as SSE (used by gcc for floating point) and Altivec require
1508 // 16-byte alignment.
1509 // We calculate the correct alignment from the header before
1510 // reading the file, and then we misalign oc->image on purpose so
1511 // that the actual sections end up aligned again.
1512 oc->misalignment = machoGetMisalignment(f);
1513 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1514 oc->image += oc->misalignment;
1516 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1521 n = fread ( oc->image, 1, oc->fileSize, f );
1522 if (n != oc->fileSize)
1523 barf("loadObj: error whilst reading `%s'", path);
1526 #endif /* USE_MMAP */
1528 # if defined(OBJFORMAT_MACHO) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1529 r = ocAllocateSymbolExtras_MachO ( oc );
1530 if (!r) { return r; }
1531 # elif defined(OBJFORMAT_ELF) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1532 r = ocAllocateSymbolExtras_ELF ( oc );
1533 if (!r) { return r; }
1536 /* verify the in-memory image */
1537 # if defined(OBJFORMAT_ELF)
1538 r = ocVerifyImage_ELF ( oc );
1539 # elif defined(OBJFORMAT_PEi386)
1540 r = ocVerifyImage_PEi386 ( oc );
1541 # elif defined(OBJFORMAT_MACHO)
1542 r = ocVerifyImage_MachO ( oc );
1544 barf("loadObj: no verify method");
1546 if (!r) { return r; }
1548 /* build the symbol list for this image */
1549 # if defined(OBJFORMAT_ELF)
1550 r = ocGetNames_ELF ( oc );
1551 # elif defined(OBJFORMAT_PEi386)
1552 r = ocGetNames_PEi386 ( oc );
1553 # elif defined(OBJFORMAT_MACHO)
1554 r = ocGetNames_MachO ( oc );
1556 barf("loadObj: no getNames method");
1558 if (!r) { return r; }
1560 /* loaded, but not resolved yet */
1561 oc->status = OBJECT_LOADED;
1566 /* -----------------------------------------------------------------------------
1567 * resolve all the currently unlinked objects in memory
1569 * Returns: 1 if ok, 0 on error.
1579 for (oc = objects; oc; oc = oc->next) {
1580 if (oc->status != OBJECT_RESOLVED) {
1581 # if defined(OBJFORMAT_ELF)
1582 r = ocResolve_ELF ( oc );
1583 # elif defined(OBJFORMAT_PEi386)
1584 r = ocResolve_PEi386 ( oc );
1585 # elif defined(OBJFORMAT_MACHO)
1586 r = ocResolve_MachO ( oc );
1588 barf("resolveObjs: not implemented on this platform");
1590 if (!r) { return r; }
1591 oc->status = OBJECT_RESOLVED;
1597 /* -----------------------------------------------------------------------------
1598 * delete an object from the pool
1601 unloadObj( char *path )
1603 ObjectCode *oc, *prev;
1605 ASSERT(symhash != NULL);
1606 ASSERT(objects != NULL);
1611 for (oc = objects; oc; prev = oc, oc = oc->next) {
1612 if (!strcmp(oc->fileName,path)) {
1614 /* Remove all the mappings for the symbols within this
1619 for (i = 0; i < oc->n_symbols; i++) {
1620 if (oc->symbols[i] != NULL) {
1621 removeStrHashTable(symhash, oc->symbols[i], NULL);
1629 prev->next = oc->next;
1632 // We're going to leave this in place, in case there are
1633 // any pointers from the heap into it:
1634 // #ifdef mingw32_HOST_OS
1635 // VirtualFree(oc->image);
1637 // stgFree(oc->image);
1639 stgFree(oc->fileName);
1640 stgFree(oc->symbols);
1641 stgFree(oc->sections);
1647 errorBelch("unloadObj: can't find `%s' to unload", path);
1651 /* -----------------------------------------------------------------------------
1652 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1653 * which may be prodded during relocation, and abort if we try and write
1654 * outside any of these.
1656 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1659 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1660 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1664 pb->next = oc->proddables;
1665 oc->proddables = pb;
1668 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1671 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1672 char* s = (char*)(pb->start);
1673 char* e = s + pb->size - 1;
1674 char* a = (char*)addr;
1675 /* Assumes that the biggest fixup involves a 4-byte write. This
1676 probably needs to be changed to 8 (ie, +7) on 64-bit
1678 if (a >= s && (a+3) <= e) return;
1680 barf("checkProddableBlock: invalid fixup in runtime linker");
1683 /* -----------------------------------------------------------------------------
1684 * Section management.
1686 static void addSection ( ObjectCode* oc, SectionKind kind,
1687 void* start, void* end )
1689 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1693 s->next = oc->sections;
1696 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1697 start, ((char*)end)-1, end - start + 1, kind );
1702 /* --------------------------------------------------------------------------
1704 * This is about allocating a small chunk of memory for every symbol in the
1705 * object file. We make sure that the SymboLExtras are always "in range" of
1706 * limited-range PC-relative instructions on various platforms by allocating
1707 * them right next to the object code itself.
1710 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
1713 ocAllocateSymbolExtras
1715 Allocate additional space at the end of the object file image to make room
1716 for jump islands (powerpc, x86_64) and GOT entries (x86_64).
1718 PowerPC relative branch instructions have a 24 bit displacement field.
1719 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1720 If a particular imported symbol is outside this range, we have to redirect
1721 the jump to a short piece of new code that just loads the 32bit absolute
1722 address and jumps there.
1723 On x86_64, PC-relative jumps and PC-relative accesses to the GOT are limited
1726 This function just allocates space for one SymbolExtra for every
1727 undefined symbol in the object file. The code for the jump islands is
1728 filled in by makeSymbolExtra below.
1731 static int ocAllocateSymbolExtras( ObjectCode* oc, int count, int first )
1738 int misalignment = 0;
1739 #ifdef darwin_HOST_OS
1740 misalignment = oc->misalignment;
1746 // round up to the nearest 4
1747 aligned = (oc->fileSize + 3) & ~3;
1750 pagesize = getpagesize();
1751 n = ROUND_UP( oc->fileSize, pagesize );
1752 m = ROUND_UP( aligned + sizeof (SymbolExtra) * count, pagesize );
1754 /* we try to use spare space at the end of the last page of the
1755 * image for the jump islands, but if there isn't enough space
1756 * then we have to map some (anonymously, remembering MAP_32BIT).
1758 if( m > n ) // we need to allocate more pages
1760 oc->symbol_extras = mmapForLinker(sizeof(SymbolExtra) * count,
1765 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1768 oc->image -= misalignment;
1769 oc->image = stgReallocBytes( oc->image,
1771 aligned + sizeof (SymbolExtra) * count,
1772 "ocAllocateSymbolExtras" );
1773 oc->image += misalignment;
1775 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1776 #endif /* USE_MMAP */
1778 memset( oc->symbol_extras, 0, sizeof (SymbolExtra) * count );
1781 oc->symbol_extras = NULL;
1783 oc->first_symbol_extra = first;
1784 oc->n_symbol_extras = count;
1789 static SymbolExtra* makeSymbolExtra( ObjectCode* oc,
1790 unsigned long symbolNumber,
1791 unsigned long target )
1795 ASSERT( symbolNumber >= oc->first_symbol_extra
1796 && symbolNumber - oc->first_symbol_extra < oc->n_symbol_extras);
1798 extra = &oc->symbol_extras[symbolNumber - oc->first_symbol_extra];
1800 #ifdef powerpc_HOST_ARCH
1801 // lis r12, hi16(target)
1802 extra->jumpIsland.lis_r12 = 0x3d80;
1803 extra->jumpIsland.hi_addr = target >> 16;
1805 // ori r12, r12, lo16(target)
1806 extra->jumpIsland.ori_r12_r12 = 0x618c;
1807 extra->jumpIsland.lo_addr = target & 0xffff;
1810 extra->jumpIsland.mtctr_r12 = 0x7d8903a6;
1813 extra->jumpIsland.bctr = 0x4e800420;
1815 #ifdef x86_64_HOST_ARCH
1817 static uint8_t jmp[] = { 0xFF, 0x25, 0xF2, 0xFF, 0xFF, 0xFF };
1818 extra->addr = target;
1819 memcpy(extra->jumpIsland, jmp, 6);
1827 /* --------------------------------------------------------------------------
1828 * PowerPC specifics (instruction cache flushing)
1829 * ------------------------------------------------------------------------*/
1831 #ifdef powerpc_TARGET_ARCH
1833 ocFlushInstructionCache
1835 Flush the data & instruction caches.
1836 Because the PPC has split data/instruction caches, we have to
1837 do that whenever we modify code at runtime.
1840 static void ocFlushInstructionCache( ObjectCode *oc )
1842 int n = (oc->fileSize + sizeof( SymbolExtra ) * oc->n_symbol_extras + 3) / 4;
1843 unsigned long *p = (unsigned long *) oc->image;
1847 __asm__ volatile ( "dcbf 0,%0\n\t"
1855 __asm__ volatile ( "sync\n\t"
1861 /* --------------------------------------------------------------------------
1862 * PEi386 specifics (Win32 targets)
1863 * ------------------------------------------------------------------------*/
1865 /* The information for this linker comes from
1866 Microsoft Portable Executable
1867 and Common Object File Format Specification
1868 revision 5.1 January 1998
1869 which SimonM says comes from the MS Developer Network CDs.
1871 It can be found there (on older CDs), but can also be found
1874 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1876 (this is Rev 6.0 from February 1999).
1878 Things move, so if that fails, try searching for it via
1880 http://www.google.com/search?q=PE+COFF+specification
1882 The ultimate reference for the PE format is the Winnt.h
1883 header file that comes with the Platform SDKs; as always,
1884 implementations will drift wrt their documentation.
1886 A good background article on the PE format is Matt Pietrek's
1887 March 1994 article in Microsoft System Journal (MSJ)
1888 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1889 Win32 Portable Executable File Format." The info in there
1890 has recently been updated in a two part article in
1891 MSDN magazine, issues Feb and March 2002,
1892 "Inside Windows: An In-Depth Look into the Win32 Portable
1893 Executable File Format"
1895 John Levine's book "Linkers and Loaders" contains useful
1900 #if defined(OBJFORMAT_PEi386)
1904 typedef unsigned char UChar;
1905 typedef unsigned short UInt16;
1906 typedef unsigned int UInt32;
1913 UInt16 NumberOfSections;
1914 UInt32 TimeDateStamp;
1915 UInt32 PointerToSymbolTable;
1916 UInt32 NumberOfSymbols;
1917 UInt16 SizeOfOptionalHeader;
1918 UInt16 Characteristics;
1922 #define sizeof_COFF_header 20
1929 UInt32 VirtualAddress;
1930 UInt32 SizeOfRawData;
1931 UInt32 PointerToRawData;
1932 UInt32 PointerToRelocations;
1933 UInt32 PointerToLinenumbers;
1934 UInt16 NumberOfRelocations;
1935 UInt16 NumberOfLineNumbers;
1936 UInt32 Characteristics;
1940 #define sizeof_COFF_section 40
1947 UInt16 SectionNumber;
1950 UChar NumberOfAuxSymbols;
1954 #define sizeof_COFF_symbol 18
1959 UInt32 VirtualAddress;
1960 UInt32 SymbolTableIndex;
1965 #define sizeof_COFF_reloc 10
1968 /* From PE spec doc, section 3.3.2 */
1969 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1970 windows.h -- for the same purpose, but I want to know what I'm
1972 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1973 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1974 #define MYIMAGE_FILE_DLL 0x2000
1975 #define MYIMAGE_FILE_SYSTEM 0x1000
1976 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1977 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1978 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1980 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1981 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1982 #define MYIMAGE_SYM_CLASS_STATIC 3
1983 #define MYIMAGE_SYM_UNDEFINED 0
1985 /* From PE spec doc, section 4.1 */
1986 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1987 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1988 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1990 /* From PE spec doc, section 5.2.1 */
1991 #define MYIMAGE_REL_I386_DIR32 0x0006
1992 #define MYIMAGE_REL_I386_REL32 0x0014
1995 /* We use myindex to calculate array addresses, rather than
1996 simply doing the normal subscript thing. That's because
1997 some of the above structs have sizes which are not
1998 a whole number of words. GCC rounds their sizes up to a
1999 whole number of words, which means that the address calcs
2000 arising from using normal C indexing or pointer arithmetic
2001 are just plain wrong. Sigh.
2004 myindex ( int scale, void* base, int index )
2007 ((UChar*)base) + scale * index;
2012 printName ( UChar* name, UChar* strtab )
2014 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2015 UInt32 strtab_offset = * (UInt32*)(name+4);
2016 debugBelch("%s", strtab + strtab_offset );
2019 for (i = 0; i < 8; i++) {
2020 if (name[i] == 0) break;
2021 debugBelch("%c", name[i] );
2028 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
2030 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2031 UInt32 strtab_offset = * (UInt32*)(name+4);
2032 strncpy ( dst, strtab+strtab_offset, dstSize );
2038 if (name[i] == 0) break;
2048 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
2051 /* If the string is longer than 8 bytes, look in the
2052 string table for it -- this will be correctly zero terminated.
2054 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2055 UInt32 strtab_offset = * (UInt32*)(name+4);
2056 return ((UChar*)strtab) + strtab_offset;
2058 /* Otherwise, if shorter than 8 bytes, return the original,
2059 which by defn is correctly terminated.
2061 if (name[7]==0) return name;
2062 /* The annoying case: 8 bytes. Copy into a temporary
2063 (which is never freed ...)
2065 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
2067 strncpy(newstr,name,8);
2073 /* Just compares the short names (first 8 chars) */
2074 static COFF_section *
2075 findPEi386SectionCalled ( ObjectCode* oc, char* name )
2079 = (COFF_header*)(oc->image);
2080 COFF_section* sectab
2082 ((UChar*)(oc->image))
2083 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2085 for (i = 0; i < hdr->NumberOfSections; i++) {
2088 COFF_section* section_i
2090 myindex ( sizeof_COFF_section, sectab, i );
2091 n1 = (UChar*) &(section_i->Name);
2093 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
2094 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
2095 n1[6]==n2[6] && n1[7]==n2[7])
2104 zapTrailingAtSign ( UChar* sym )
2106 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
2108 if (sym[0] == 0) return;
2110 while (sym[i] != 0) i++;
2113 while (j > 0 && my_isdigit(sym[j])) j--;
2114 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
2119 lookupSymbolInDLLs ( UChar *lbl )
2124 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
2125 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
2127 if (lbl[0] == '_') {
2128 /* HACK: if the name has an initial underscore, try stripping
2129 it off & look that up first. I've yet to verify whether there's
2130 a Rule that governs whether an initial '_' *should always* be
2131 stripped off when mapping from import lib name to the DLL name.
2133 sym = GetProcAddress(o_dll->instance, (lbl+1));
2135 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
2139 sym = GetProcAddress(o_dll->instance, lbl);
2141 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
2150 ocVerifyImage_PEi386 ( ObjectCode* oc )
2155 COFF_section* sectab;
2156 COFF_symbol* symtab;
2158 /* debugBelch("\nLOADING %s\n", oc->fileName); */
2159 hdr = (COFF_header*)(oc->image);
2160 sectab = (COFF_section*) (
2161 ((UChar*)(oc->image))
2162 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2164 symtab = (COFF_symbol*) (
2165 ((UChar*)(oc->image))
2166 + hdr->PointerToSymbolTable
2168 strtab = ((UChar*)symtab)
2169 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2171 if (hdr->Machine != 0x14c) {
2172 errorBelch("%s: Not x86 PEi386", oc->fileName);
2175 if (hdr->SizeOfOptionalHeader != 0) {
2176 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2179 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2180 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2181 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2182 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2183 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2186 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2187 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2188 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2190 (int)(hdr->Characteristics));
2193 /* If the string table size is way crazy, this might indicate that
2194 there are more than 64k relocations, despite claims to the
2195 contrary. Hence this test. */
2196 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2198 if ( (*(UInt32*)strtab) > 600000 ) {
2199 /* Note that 600k has no special significance other than being
2200 big enough to handle the almost-2MB-sized lumps that
2201 constitute HSwin32*.o. */
2202 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2207 /* No further verification after this point; only debug printing. */
2209 IF_DEBUG(linker, i=1);
2210 if (i == 0) return 1;
2212 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2213 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2214 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2217 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2218 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2219 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2220 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2221 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2222 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2223 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2225 /* Print the section table. */
2227 for (i = 0; i < hdr->NumberOfSections; i++) {
2229 COFF_section* sectab_i
2231 myindex ( sizeof_COFF_section, sectab, i );
2238 printName ( sectab_i->Name, strtab );
2248 sectab_i->VirtualSize,
2249 sectab_i->VirtualAddress,
2250 sectab_i->SizeOfRawData,
2251 sectab_i->PointerToRawData,
2252 sectab_i->NumberOfRelocations,
2253 sectab_i->PointerToRelocations,
2254 sectab_i->PointerToRawData
2256 reltab = (COFF_reloc*) (
2257 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2260 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2261 /* If the relocation field (a short) has overflowed, the
2262 * real count can be found in the first reloc entry.
2264 * See Section 4.1 (last para) of the PE spec (rev6.0).
2266 COFF_reloc* rel = (COFF_reloc*)
2267 myindex ( sizeof_COFF_reloc, reltab, 0 );
2268 noRelocs = rel->VirtualAddress;
2271 noRelocs = sectab_i->NumberOfRelocations;
2275 for (; j < noRelocs; j++) {
2277 COFF_reloc* rel = (COFF_reloc*)
2278 myindex ( sizeof_COFF_reloc, reltab, j );
2280 " type 0x%-4x vaddr 0x%-8x name `",
2282 rel->VirtualAddress );
2283 sym = (COFF_symbol*)
2284 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2285 /* Hmm..mysterious looking offset - what's it for? SOF */
2286 printName ( sym->Name, strtab -10 );
2293 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2294 debugBelch("---START of string table---\n");
2295 for (i = 4; i < *(Int32*)strtab; i++) {
2297 debugBelch("\n"); else
2298 debugBelch("%c", strtab[i] );
2300 debugBelch("--- END of string table---\n");
2305 COFF_symbol* symtab_i;
2306 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2307 symtab_i = (COFF_symbol*)
2308 myindex ( sizeof_COFF_symbol, symtab, i );
2314 printName ( symtab_i->Name, strtab );
2323 (Int32)(symtab_i->SectionNumber),
2324 (UInt32)symtab_i->Type,
2325 (UInt32)symtab_i->StorageClass,
2326 (UInt32)symtab_i->NumberOfAuxSymbols
2328 i += symtab_i->NumberOfAuxSymbols;
2338 ocGetNames_PEi386 ( ObjectCode* oc )
2341 COFF_section* sectab;
2342 COFF_symbol* symtab;
2349 hdr = (COFF_header*)(oc->image);
2350 sectab = (COFF_section*) (
2351 ((UChar*)(oc->image))
2352 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2354 symtab = (COFF_symbol*) (
2355 ((UChar*)(oc->image))
2356 + hdr->PointerToSymbolTable
2358 strtab = ((UChar*)(oc->image))
2359 + hdr->PointerToSymbolTable
2360 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2362 /* Allocate space for any (local, anonymous) .bss sections. */
2364 for (i = 0; i < hdr->NumberOfSections; i++) {
2367 COFF_section* sectab_i
2369 myindex ( sizeof_COFF_section, sectab, i );
2370 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2371 /* sof 10/05: the PE spec text isn't too clear regarding what
2372 * the SizeOfRawData field is supposed to hold for object
2373 * file sections containing just uninitialized data -- for executables,
2374 * it is supposed to be zero; unclear what it's supposed to be
2375 * for object files. However, VirtualSize is guaranteed to be
2376 * zero for object files, which definitely suggests that SizeOfRawData
2377 * will be non-zero (where else would the size of this .bss section be
2378 * stored?) Looking at the COFF_section info for incoming object files,
2379 * this certainly appears to be the case.
2381 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2382 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2383 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2384 * variable decls into to the .bss section. (The specific function in Q which
2385 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2387 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2388 /* This is a non-empty .bss section. Allocate zeroed space for
2389 it, and set its PointerToRawData field such that oc->image +
2390 PointerToRawData == addr_of_zeroed_space. */
2391 bss_sz = sectab_i->VirtualSize;
2392 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2393 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2394 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2395 addProddableBlock(oc, zspace, bss_sz);
2396 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2399 /* Copy section information into the ObjectCode. */
2401 for (i = 0; i < hdr->NumberOfSections; i++) {
2407 = SECTIONKIND_OTHER;
2408 COFF_section* sectab_i
2410 myindex ( sizeof_COFF_section, sectab, i );
2411 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2414 /* I'm sure this is the Right Way to do it. However, the
2415 alternative of testing the sectab_i->Name field seems to
2416 work ok with Cygwin.
2418 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2419 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2420 kind = SECTIONKIND_CODE_OR_RODATA;
2423 if (0==strcmp(".text",sectab_i->Name) ||
2424 0==strcmp(".rdata",sectab_i->Name)||
2425 0==strcmp(".rodata",sectab_i->Name))
2426 kind = SECTIONKIND_CODE_OR_RODATA;
2427 if (0==strcmp(".data",sectab_i->Name) ||
2428 0==strcmp(".bss",sectab_i->Name))
2429 kind = SECTIONKIND_RWDATA;
2431 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2432 sz = sectab_i->SizeOfRawData;
2433 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2435 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2436 end = start + sz - 1;
2438 if (kind == SECTIONKIND_OTHER
2439 /* Ignore sections called which contain stabs debugging
2441 && 0 != strcmp(".stab", sectab_i->Name)
2442 && 0 != strcmp(".stabstr", sectab_i->Name)
2443 /* ignore constructor section for now */
2444 && 0 != strcmp(".ctors", sectab_i->Name)
2445 /* ignore section generated from .ident */
2446 && 0!= strcmp("/4", sectab_i->Name)
2447 /* ignore unknown section that appeared in gcc 3.4.5(?) */
2448 && 0!= strcmp(".reloc", sectab_i->Name)
2450 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2454 if (kind != SECTIONKIND_OTHER && end >= start) {
2455 addSection(oc, kind, start, end);
2456 addProddableBlock(oc, start, end - start + 1);
2460 /* Copy exported symbols into the ObjectCode. */
2462 oc->n_symbols = hdr->NumberOfSymbols;
2463 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2464 "ocGetNames_PEi386(oc->symbols)");
2465 /* Call me paranoid; I don't care. */
2466 for (i = 0; i < oc->n_symbols; i++)
2467 oc->symbols[i] = NULL;
2471 COFF_symbol* symtab_i;
2472 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2473 symtab_i = (COFF_symbol*)
2474 myindex ( sizeof_COFF_symbol, symtab, i );
2478 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2479 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2480 /* This symbol is global and defined, viz, exported */
2481 /* for MYIMAGE_SYMCLASS_EXTERNAL
2482 && !MYIMAGE_SYM_UNDEFINED,
2483 the address of the symbol is:
2484 address of relevant section + offset in section
2486 COFF_section* sectabent
2487 = (COFF_section*) myindex ( sizeof_COFF_section,
2489 symtab_i->SectionNumber-1 );
2490 addr = ((UChar*)(oc->image))
2491 + (sectabent->PointerToRawData
2495 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2496 && symtab_i->Value > 0) {
2497 /* This symbol isn't in any section at all, ie, global bss.
2498 Allocate zeroed space for it. */
2499 addr = stgCallocBytes(1, symtab_i->Value,
2500 "ocGetNames_PEi386(non-anonymous bss)");
2501 addSection(oc, SECTIONKIND_RWDATA, addr,
2502 ((UChar*)addr) + symtab_i->Value - 1);
2503 addProddableBlock(oc, addr, symtab_i->Value);
2504 /* debugBelch("BSS section at 0x%x\n", addr); */
2507 if (addr != NULL ) {
2508 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2509 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2510 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2511 ASSERT(i >= 0 && i < oc->n_symbols);
2512 /* cstring_from_COFF_symbol_name always succeeds. */
2513 oc->symbols[i] = sname;
2514 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2518 "IGNORING symbol %d\n"
2522 printName ( symtab_i->Name, strtab );
2531 (Int32)(symtab_i->SectionNumber),
2532 (UInt32)symtab_i->Type,
2533 (UInt32)symtab_i->StorageClass,
2534 (UInt32)symtab_i->NumberOfAuxSymbols
2539 i += symtab_i->NumberOfAuxSymbols;
2548 ocResolve_PEi386 ( ObjectCode* oc )
2551 COFF_section* sectab;
2552 COFF_symbol* symtab;
2562 /* ToDo: should be variable-sized? But is at least safe in the
2563 sense of buffer-overrun-proof. */
2565 /* debugBelch("resolving for %s\n", oc->fileName); */
2567 hdr = (COFF_header*)(oc->image);
2568 sectab = (COFF_section*) (
2569 ((UChar*)(oc->image))
2570 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2572 symtab = (COFF_symbol*) (
2573 ((UChar*)(oc->image))
2574 + hdr->PointerToSymbolTable
2576 strtab = ((UChar*)(oc->image))
2577 + hdr->PointerToSymbolTable
2578 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2580 for (i = 0; i < hdr->NumberOfSections; i++) {
2581 COFF_section* sectab_i
2583 myindex ( sizeof_COFF_section, sectab, i );
2586 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2589 /* Ignore sections called which contain stabs debugging
2591 if (0 == strcmp(".stab", sectab_i->Name)
2592 || 0 == strcmp(".stabstr", sectab_i->Name)
2593 || 0 == strcmp(".ctors", sectab_i->Name))
2596 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2597 /* If the relocation field (a short) has overflowed, the
2598 * real count can be found in the first reloc entry.
2600 * See Section 4.1 (last para) of the PE spec (rev6.0).
2602 * Nov2003 update: the GNU linker still doesn't correctly
2603 * handle the generation of relocatable object files with
2604 * overflown relocations. Hence the output to warn of potential
2607 COFF_reloc* rel = (COFF_reloc*)
2608 myindex ( sizeof_COFF_reloc, reltab, 0 );
2609 noRelocs = rel->VirtualAddress;
2611 /* 10/05: we now assume (and check for) a GNU ld that is capable
2612 * of handling object files with (>2^16) of relocs.
2615 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2620 noRelocs = sectab_i->NumberOfRelocations;
2625 for (; j < noRelocs; j++) {
2627 COFF_reloc* reltab_j
2629 myindex ( sizeof_COFF_reloc, reltab, j );
2631 /* the location to patch */
2633 ((UChar*)(oc->image))
2634 + (sectab_i->PointerToRawData
2635 + reltab_j->VirtualAddress
2636 - sectab_i->VirtualAddress )
2638 /* the existing contents of pP */
2640 /* the symbol to connect to */
2641 sym = (COFF_symbol*)
2642 myindex ( sizeof_COFF_symbol,
2643 symtab, reltab_j->SymbolTableIndex );
2646 "reloc sec %2d num %3d: type 0x%-4x "
2647 "vaddr 0x%-8x name `",
2649 (UInt32)reltab_j->Type,
2650 reltab_j->VirtualAddress );
2651 printName ( sym->Name, strtab );
2652 debugBelch("'\n" ));
2654 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2655 COFF_section* section_sym
2656 = findPEi386SectionCalled ( oc, sym->Name );
2658 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2661 S = ((UInt32)(oc->image))
2662 + (section_sym->PointerToRawData
2665 copyName ( sym->Name, strtab, symbol, 1000-1 );
2666 S = (UInt32) lookupSymbol( symbol );
2667 if ((void*)S != NULL) goto foundit;
2668 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
2672 checkProddableBlock(oc, pP);
2673 switch (reltab_j->Type) {
2674 case MYIMAGE_REL_I386_DIR32:
2677 case MYIMAGE_REL_I386_REL32:
2678 /* Tricky. We have to insert a displacement at
2679 pP which, when added to the PC for the _next_
2680 insn, gives the address of the target (S).
2681 Problem is to know the address of the next insn
2682 when we only know pP. We assume that this
2683 literal field is always the last in the insn,
2684 so that the address of the next insn is pP+4
2685 -- hence the constant 4.
2686 Also I don't know if A should be added, but so
2687 far it has always been zero.
2689 SOF 05/2005: 'A' (old contents of *pP) have been observed
2690 to contain values other than zero (the 'wx' object file
2691 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2692 So, add displacement to old value instead of asserting
2693 A to be zero. Fixes wxhaskell-related crashes, and no other
2694 ill effects have been observed.
2696 Update: the reason why we're seeing these more elaborate
2697 relocations is due to a switch in how the NCG compiles SRTs
2698 and offsets to them from info tables. SRTs live in .(ro)data,
2699 while info tables live in .text, causing GAS to emit REL32/DISP32
2700 relocations with non-zero values. Adding the displacement is
2701 the right thing to do.
2703 *pP = S - ((UInt32)pP) - 4 + A;
2706 debugBelch("%s: unhandled PEi386 relocation type %d",
2707 oc->fileName, reltab_j->Type);
2714 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2718 #endif /* defined(OBJFORMAT_PEi386) */
2721 /* --------------------------------------------------------------------------
2723 * ------------------------------------------------------------------------*/
2725 #if defined(OBJFORMAT_ELF)
2730 #if defined(sparc_HOST_ARCH)
2731 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2732 #elif defined(i386_HOST_ARCH)
2733 # define ELF_TARGET_386 /* Used inside <elf.h> */
2734 #elif defined(x86_64_HOST_ARCH)
2735 # define ELF_TARGET_X64_64
2737 #elif defined (ia64_HOST_ARCH)
2738 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2740 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2741 # define ELF_NEED_GOT /* needs Global Offset Table */
2742 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2745 #if !defined(openbsd_HOST_OS)
2748 /* openbsd elf has things in different places, with diff names */
2749 # include <elf_abi.h>
2750 # include <machine/reloc.h>
2751 # define R_386_32 RELOC_32
2752 # define R_386_PC32 RELOC_PC32
2755 /* If elf.h doesn't define it */
2756 # ifndef R_X86_64_PC64
2757 # define R_X86_64_PC64 24
2761 * Define a set of types which can be used for both ELF32 and ELF64
2765 #define ELFCLASS ELFCLASS64
2766 #define Elf_Addr Elf64_Addr
2767 #define Elf_Word Elf64_Word
2768 #define Elf_Sword Elf64_Sword
2769 #define Elf_Ehdr Elf64_Ehdr
2770 #define Elf_Phdr Elf64_Phdr
2771 #define Elf_Shdr Elf64_Shdr
2772 #define Elf_Sym Elf64_Sym
2773 #define Elf_Rel Elf64_Rel
2774 #define Elf_Rela Elf64_Rela
2775 #define ELF_ST_TYPE ELF64_ST_TYPE
2776 #define ELF_ST_BIND ELF64_ST_BIND
2777 #define ELF_R_TYPE ELF64_R_TYPE
2778 #define ELF_R_SYM ELF64_R_SYM
2780 #define ELFCLASS ELFCLASS32
2781 #define Elf_Addr Elf32_Addr
2782 #define Elf_Word Elf32_Word
2783 #define Elf_Sword Elf32_Sword
2784 #define Elf_Ehdr Elf32_Ehdr
2785 #define Elf_Phdr Elf32_Phdr
2786 #define Elf_Shdr Elf32_Shdr
2787 #define Elf_Sym Elf32_Sym
2788 #define Elf_Rel Elf32_Rel
2789 #define Elf_Rela Elf32_Rela
2791 #define ELF_ST_TYPE ELF32_ST_TYPE
2794 #define ELF_ST_BIND ELF32_ST_BIND
2797 #define ELF_R_TYPE ELF32_R_TYPE
2800 #define ELF_R_SYM ELF32_R_SYM
2806 * Functions to allocate entries in dynamic sections. Currently we simply
2807 * preallocate a large number, and we don't check if a entry for the given
2808 * target already exists (a linear search is too slow). Ideally these
2809 * entries would be associated with symbols.
2812 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2813 #define GOT_SIZE 0x20000
2814 #define FUNCTION_TABLE_SIZE 0x10000
2815 #define PLT_SIZE 0x08000
2818 static Elf_Addr got[GOT_SIZE];
2819 static unsigned int gotIndex;
2820 static Elf_Addr gp_val = (Elf_Addr)got;
2823 allocateGOTEntry(Elf_Addr target)
2827 if (gotIndex >= GOT_SIZE)
2828 barf("Global offset table overflow");
2830 entry = &got[gotIndex++];
2832 return (Elf_Addr)entry;
2836 #ifdef ELF_FUNCTION_DESC
2842 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2843 static unsigned int functionTableIndex;
2846 allocateFunctionDesc(Elf_Addr target)
2848 FunctionDesc *entry;
2850 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2851 barf("Function table overflow");
2853 entry = &functionTable[functionTableIndex++];
2855 entry->gp = (Elf_Addr)gp_val;
2856 return (Elf_Addr)entry;
2860 copyFunctionDesc(Elf_Addr target)
2862 FunctionDesc *olddesc = (FunctionDesc *)target;
2863 FunctionDesc *newdesc;
2865 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2866 newdesc->gp = olddesc->gp;
2867 return (Elf_Addr)newdesc;
2872 #ifdef ia64_HOST_ARCH
2873 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2874 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2876 static unsigned char plt_code[] =
2878 /* taken from binutils bfd/elfxx-ia64.c */
2879 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2880 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2881 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2882 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2883 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2884 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2887 /* If we can't get to the function descriptor via gp, take a local copy of it */
2888 #define PLT_RELOC(code, target) { \
2889 Elf64_Sxword rel_value = target - gp_val; \
2890 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2891 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2893 ia64_reloc_gprel22((Elf_Addr)code, target); \
2898 unsigned char code[sizeof(plt_code)];
2902 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2904 PLTEntry *plt = (PLTEntry *)oc->plt;
2907 if (oc->pltIndex >= PLT_SIZE)
2908 barf("Procedure table overflow");
2910 entry = &plt[oc->pltIndex++];
2911 memcpy(entry->code, plt_code, sizeof(entry->code));
2912 PLT_RELOC(entry->code, target);
2913 return (Elf_Addr)entry;
2919 return (PLT_SIZE * sizeof(PLTEntry));
2925 * Generic ELF functions
2929 findElfSection ( void* objImage, Elf_Word sh_type )
2931 char* ehdrC = (char*)objImage;
2932 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2933 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2934 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2938 for (i = 0; i < ehdr->e_shnum; i++) {
2939 if (shdr[i].sh_type == sh_type
2940 /* Ignore the section header's string table. */
2941 && i != ehdr->e_shstrndx
2942 /* Ignore string tables named .stabstr, as they contain
2944 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2946 ptr = ehdrC + shdr[i].sh_offset;
2953 #if defined(ia64_HOST_ARCH)
2955 findElfSegment ( void* objImage, Elf_Addr vaddr )
2957 char* ehdrC = (char*)objImage;
2958 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2959 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2960 Elf_Addr segaddr = 0;
2963 for (i = 0; i < ehdr->e_phnum; i++) {
2964 segaddr = phdr[i].p_vaddr;
2965 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2973 ocVerifyImage_ELF ( ObjectCode* oc )
2977 int i, j, nent, nstrtab, nsymtabs;
2981 char* ehdrC = (char*)(oc->image);
2982 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2984 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2985 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2986 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2987 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2988 errorBelch("%s: not an ELF object", oc->fileName);
2992 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2993 errorBelch("%s: unsupported ELF format", oc->fileName);
2997 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2998 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
3000 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
3001 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
3003 errorBelch("%s: unknown endiannness", oc->fileName);
3007 if (ehdr->e_type != ET_REL) {
3008 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
3011 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
3013 IF_DEBUG(linker,debugBelch( "Architecture is " ));
3014 switch (ehdr->e_machine) {
3015 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
3016 #ifdef EM_SPARC32PLUS
3017 case EM_SPARC32PLUS:
3019 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
3021 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
3023 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
3025 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
3026 #elif defined(EM_AMD64)
3027 case EM_AMD64: IF_DEBUG(linker,debugBelch( "amd64" )); break;
3029 default: IF_DEBUG(linker,debugBelch( "unknown" ));
3030 errorBelch("%s: unknown architecture (e_machine == %d)"
3031 , oc->fileName, ehdr->e_machine);
3035 IF_DEBUG(linker,debugBelch(
3036 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
3037 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
3039 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
3041 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3043 if (ehdr->e_shstrndx == SHN_UNDEF) {
3044 errorBelch("%s: no section header string table", oc->fileName);
3047 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
3049 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
3052 for (i = 0; i < ehdr->e_shnum; i++) {
3053 IF_DEBUG(linker,debugBelch("%2d: ", i ));
3054 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
3055 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
3056 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
3057 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
3058 ehdrC + shdr[i].sh_offset,
3059 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
3061 if (shdr[i].sh_type == SHT_REL) {
3062 IF_DEBUG(linker,debugBelch("Rel " ));
3063 } else if (shdr[i].sh_type == SHT_RELA) {
3064 IF_DEBUG(linker,debugBelch("RelA " ));
3066 IF_DEBUG(linker,debugBelch(" "));
3069 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
3073 IF_DEBUG(linker,debugBelch( "\nString tables" ));
3076 for (i = 0; i < ehdr->e_shnum; i++) {
3077 if (shdr[i].sh_type == SHT_STRTAB
3078 /* Ignore the section header's string table. */
3079 && i != ehdr->e_shstrndx
3080 /* Ignore string tables named .stabstr, as they contain
3082 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
3084 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
3085 strtab = ehdrC + shdr[i].sh_offset;
3090 errorBelch("%s: no string tables, or too many", oc->fileName);
3095 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
3096 for (i = 0; i < ehdr->e_shnum; i++) {
3097 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3098 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
3100 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3101 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3102 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
3104 (long)shdr[i].sh_size % sizeof(Elf_Sym)
3106 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
3107 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
3110 for (j = 0; j < nent; j++) {
3111 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3112 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3113 (int)stab[j].st_shndx,
3114 (int)stab[j].st_size,
3115 (char*)stab[j].st_value ));
3117 IF_DEBUG(linker,debugBelch("type=" ));
3118 switch (ELF_ST_TYPE(stab[j].st_info)) {
3119 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3120 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3121 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3122 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3123 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3124 default: IF_DEBUG(linker,debugBelch("? " )); break;
3126 IF_DEBUG(linker,debugBelch(" " ));
3128 IF_DEBUG(linker,debugBelch("bind=" ));
3129 switch (ELF_ST_BIND(stab[j].st_info)) {
3130 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3131 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3132 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3133 default: IF_DEBUG(linker,debugBelch("? " )); break;
3135 IF_DEBUG(linker,debugBelch(" " ));
3137 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3141 if (nsymtabs == 0) {
3142 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3149 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3153 if (hdr->sh_type == SHT_PROGBITS
3154 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3155 /* .text-style section */
3156 return SECTIONKIND_CODE_OR_RODATA;
3159 if (hdr->sh_type == SHT_PROGBITS
3160 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3161 /* .data-style section */
3162 return SECTIONKIND_RWDATA;
3165 if (hdr->sh_type == SHT_PROGBITS
3166 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3167 /* .rodata-style section */
3168 return SECTIONKIND_CODE_OR_RODATA;
3171 if (hdr->sh_type == SHT_NOBITS
3172 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3173 /* .bss-style section */
3175 return SECTIONKIND_RWDATA;
3178 return SECTIONKIND_OTHER;
3183 ocGetNames_ELF ( ObjectCode* oc )
3188 char* ehdrC = (char*)(oc->image);
3189 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3190 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3191 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3193 ASSERT(symhash != NULL);
3196 errorBelch("%s: no strtab", oc->fileName);
3201 for (i = 0; i < ehdr->e_shnum; i++) {
3202 /* Figure out what kind of section it is. Logic derived from
3203 Figure 1.14 ("Special Sections") of the ELF document
3204 ("Portable Formats Specification, Version 1.1"). */
3206 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3208 if (is_bss && shdr[i].sh_size > 0) {
3209 /* This is a non-empty .bss section. Allocate zeroed space for
3210 it, and set its .sh_offset field such that
3211 ehdrC + .sh_offset == addr_of_zeroed_space. */
3212 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3213 "ocGetNames_ELF(BSS)");
3214 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3216 debugBelch("BSS section at 0x%x, size %d\n",
3217 zspace, shdr[i].sh_size);
3221 /* fill in the section info */
3222 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3223 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3224 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3225 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3228 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3230 /* copy stuff into this module's object symbol table */
3231 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3232 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3234 oc->n_symbols = nent;
3235 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3236 "ocGetNames_ELF(oc->symbols)");
3238 for (j = 0; j < nent; j++) {
3240 char isLocal = FALSE; /* avoids uninit-var warning */
3242 char* nm = strtab + stab[j].st_name;
3243 int secno = stab[j].st_shndx;
3245 /* Figure out if we want to add it; if so, set ad to its
3246 address. Otherwise leave ad == NULL. */
3248 if (secno == SHN_COMMON) {
3250 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3252 debugBelch("COMMON symbol, size %d name %s\n",
3253 stab[j].st_size, nm);
3255 /* Pointless to do addProddableBlock() for this area,
3256 since the linker should never poke around in it. */
3259 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3260 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3262 /* and not an undefined symbol */
3263 && stab[j].st_shndx != SHN_UNDEF
3264 /* and not in a "special section" */
3265 && stab[j].st_shndx < SHN_LORESERVE
3267 /* and it's a not a section or string table or anything silly */
3268 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3269 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3270 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3273 /* Section 0 is the undefined section, hence > and not >=. */
3274 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3276 if (shdr[secno].sh_type == SHT_NOBITS) {
3277 debugBelch(" BSS symbol, size %d off %d name %s\n",
3278 stab[j].st_size, stab[j].st_value, nm);
3281 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3282 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3285 #ifdef ELF_FUNCTION_DESC
3286 /* dlsym() and the initialisation table both give us function
3287 * descriptors, so to be consistent we store function descriptors
3288 * in the symbol table */
3289 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3290 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3292 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s\n",
3293 ad, oc->fileName, nm ));
3298 /* And the decision is ... */
3302 oc->symbols[j] = nm;
3305 /* Ignore entirely. */
3307 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3311 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3312 strtab + stab[j].st_name ));
3315 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3316 (int)ELF_ST_BIND(stab[j].st_info),
3317 (int)ELF_ST_TYPE(stab[j].st_info),
3318 (int)stab[j].st_shndx,
3319 strtab + stab[j].st_name
3322 oc->symbols[j] = NULL;
3331 /* Do ELF relocations which lack an explicit addend. All x86-linux
3332 relocations appear to be of this form. */
3334 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3335 Elf_Shdr* shdr, int shnum,
3336 Elf_Sym* stab, char* strtab )
3341 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3342 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3343 int target_shndx = shdr[shnum].sh_info;
3344 int symtab_shndx = shdr[shnum].sh_link;
3346 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3347 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3348 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3349 target_shndx, symtab_shndx ));
3351 /* Skip sections that we're not interested in. */
3354 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3355 if (kind == SECTIONKIND_OTHER) {
3356 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3361 for (j = 0; j < nent; j++) {
3362 Elf_Addr offset = rtab[j].r_offset;
3363 Elf_Addr info = rtab[j].r_info;
3365 Elf_Addr P = ((Elf_Addr)targ) + offset;
3366 Elf_Word* pP = (Elf_Word*)P;
3371 StgStablePtr stablePtr;
3374 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3375 j, (void*)offset, (void*)info ));
3377 IF_DEBUG(linker,debugBelch( " ZERO" ));
3380 Elf_Sym sym = stab[ELF_R_SYM(info)];
3381 /* First see if it is a local symbol. */
3382 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3383 /* Yes, so we can get the address directly from the ELF symbol
3385 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3387 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3388 + stab[ELF_R_SYM(info)].st_value);
3391 symbol = strtab + sym.st_name;
3392 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3393 if (NULL == stablePtr) {
3394 /* No, so look up the name in our global table. */
3395 S_tmp = lookupSymbol( symbol );
3396 S = (Elf_Addr)S_tmp;
3398 stableVal = deRefStablePtr( stablePtr );
3400 S = (Elf_Addr)S_tmp;
3404 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3407 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3410 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3411 (void*)P, (void*)S, (void*)A ));
3412 checkProddableBlock ( oc, pP );
3416 switch (ELF_R_TYPE(info)) {
3417 # ifdef i386_HOST_ARCH
3418 case R_386_32: *pP = value; break;
3419 case R_386_PC32: *pP = value - P; break;
3422 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3423 oc->fileName, (lnat)ELF_R_TYPE(info));
3431 /* Do ELF relocations for which explicit addends are supplied.
3432 sparc-solaris relocations appear to be of this form. */
3434 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3435 Elf_Shdr* shdr, int shnum,
3436 Elf_Sym* stab, char* strtab )
3439 char *symbol = NULL;
3441 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3442 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3443 int target_shndx = shdr[shnum].sh_info;
3444 int symtab_shndx = shdr[shnum].sh_link;
3446 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3447 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3448 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3449 target_shndx, symtab_shndx ));
3451 for (j = 0; j < nent; j++) {
3452 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3453 /* This #ifdef only serves to avoid unused-var warnings. */
3454 Elf_Addr offset = rtab[j].r_offset;
3455 Elf_Addr P = targ + offset;
3457 Elf_Addr info = rtab[j].r_info;
3458 Elf_Addr A = rtab[j].r_addend;
3462 # if defined(sparc_HOST_ARCH)
3463 Elf_Word* pP = (Elf_Word*)P;
3465 # elif defined(ia64_HOST_ARCH)
3466 Elf64_Xword *pP = (Elf64_Xword *)P;
3468 # elif defined(powerpc_HOST_ARCH)
3472 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3473 j, (void*)offset, (void*)info,
3476 IF_DEBUG(linker,debugBelch( " ZERO" ));
3479 Elf_Sym sym = stab[ELF_R_SYM(info)];
3480 /* First see if it is a local symbol. */
3481 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3482 /* Yes, so we can get the address directly from the ELF symbol
3484 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3486 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3487 + stab[ELF_R_SYM(info)].st_value);
3488 #ifdef ELF_FUNCTION_DESC
3489 /* Make a function descriptor for this function */
3490 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3491 S = allocateFunctionDesc(S + A);
3496 /* No, so look up the name in our global table. */
3497 symbol = strtab + sym.st_name;
3498 S_tmp = lookupSymbol( symbol );
3499 S = (Elf_Addr)S_tmp;
3501 #ifdef ELF_FUNCTION_DESC
3502 /* If a function, already a function descriptor - we would
3503 have to copy it to add an offset. */
3504 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3505 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3509 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3512 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3515 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3516 (void*)P, (void*)S, (void*)A ));
3517 /* checkProddableBlock ( oc, (void*)P ); */
3521 switch (ELF_R_TYPE(info)) {
3522 # if defined(sparc_HOST_ARCH)
3523 case R_SPARC_WDISP30:
3524 w1 = *pP & 0xC0000000;
3525 w2 = (Elf_Word)((value - P) >> 2);
3526 ASSERT((w2 & 0xC0000000) == 0);
3531 w1 = *pP & 0xFFC00000;
3532 w2 = (Elf_Word)(value >> 10);
3533 ASSERT((w2 & 0xFFC00000) == 0);
3539 w2 = (Elf_Word)(value & 0x3FF);
3540 ASSERT((w2 & ~0x3FF) == 0);
3545 /* According to the Sun documentation:
3547 This relocation type resembles R_SPARC_32, except it refers to an
3548 unaligned word. That is, the word to be relocated must be treated
3549 as four separate bytes with arbitrary alignment, not as a word
3550 aligned according to the architecture requirements.
3553 w2 = (Elf_Word)value;
3555 // SPARC doesn't do misaligned writes of 32 bit words,
3556 // so we have to do this one byte-at-a-time.
3557 char *pPc = (char*)pP;
3558 pPc[0] = (char) ((Elf_Word)(w2 & 0xff000000) >> 24);
3559 pPc[1] = (char) ((Elf_Word)(w2 & 0x00ff0000) >> 16);
3560 pPc[2] = (char) ((Elf_Word)(w2 & 0x0000ff00) >> 8);
3561 pPc[3] = (char) ((Elf_Word)(w2 & 0x000000ff));
3565 w2 = (Elf_Word)value;
3568 # elif defined(ia64_HOST_ARCH)
3569 case R_IA64_DIR64LSB:
3570 case R_IA64_FPTR64LSB:
3573 case R_IA64_PCREL64LSB:
3576 case R_IA64_SEGREL64LSB:
3577 addr = findElfSegment(ehdrC, value);
3580 case R_IA64_GPREL22:
3581 ia64_reloc_gprel22(P, value);
3583 case R_IA64_LTOFF22:
3584 case R_IA64_LTOFF22X:
3585 case R_IA64_LTOFF_FPTR22:
3586 addr = allocateGOTEntry(value);
3587 ia64_reloc_gprel22(P, addr);
3589 case R_IA64_PCREL21B:
3590 ia64_reloc_pcrel21(P, S, oc);
3593 /* This goes with R_IA64_LTOFF22X and points to the load to
3594 * convert into a move. We don't implement relaxation. */
3596 # elif defined(powerpc_HOST_ARCH)
3597 case R_PPC_ADDR16_LO:
3598 *(Elf32_Half*) P = value;
3601 case R_PPC_ADDR16_HI:
3602 *(Elf32_Half*) P = value >> 16;
3605 case R_PPC_ADDR16_HA:
3606 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3610 *(Elf32_Word *) P = value;
3614 *(Elf32_Word *) P = value - P;
3620 if( delta << 6 >> 6 != delta )
3622 value = (Elf_Addr) (&makeSymbolExtra( oc, ELF_R_SYM(info), value )
3626 if( value == 0 || delta << 6 >> 6 != delta )
3628 barf( "Unable to make SymbolExtra for #%d",
3634 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3635 | (delta & 0x3fffffc);
3639 #if x86_64_HOST_ARCH
3641 *(Elf64_Xword *)P = value;
3646 StgInt64 off = value - P;
3647 if (off >= 0x7fffffffL || off < -0x80000000L) {
3648 #if X86_64_ELF_NONPIC_HACK
3649 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3651 off = pltAddress + A - P;
3653 barf("R_X86_64_PC32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3654 symbol, off, oc->fileName );
3657 *(Elf64_Word *)P = (Elf64_Word)off;
3663 StgInt64 off = value - P;
3664 *(Elf64_Word *)P = (Elf64_Word)off;
3669 if (value >= 0x7fffffffL) {
3670 #if X86_64_ELF_NONPIC_HACK
3671 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3673 value = pltAddress + A;
3675 barf("R_X86_64_32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3676 symbol, value, oc->fileName );
3679 *(Elf64_Word *)P = (Elf64_Word)value;
3683 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3684 #if X86_64_ELF_NONPIC_HACK
3685 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3687 value = pltAddress + A;
3689 barf("R_X86_64_32S relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3690 symbol, value, oc->fileName );
3693 *(Elf64_Sword *)P = (Elf64_Sword)value;
3696 case R_X86_64_GOTPCREL:
3698 StgInt64 gotAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)->addr;
3699 StgInt64 off = gotAddress + A - P;
3700 *(Elf64_Word *)P = (Elf64_Word)off;
3704 case R_X86_64_PLT32:
3706 StgInt64 off = value - P;
3707 if (off >= 0x7fffffffL || off < -0x80000000L) {
3708 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3710 off = pltAddress + A - P;
3712 *(Elf64_Word *)P = (Elf64_Word)off;
3718 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3719 oc->fileName, (lnat)ELF_R_TYPE(info));
3728 ocResolve_ELF ( ObjectCode* oc )
3732 Elf_Sym* stab = NULL;
3733 char* ehdrC = (char*)(oc->image);
3734 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3735 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3737 /* first find "the" symbol table */
3738 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3740 /* also go find the string table */
3741 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3743 if (stab == NULL || strtab == NULL) {
3744 errorBelch("%s: can't find string or symbol table", oc->fileName);
3748 /* Process the relocation sections. */
3749 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3750 if (shdr[shnum].sh_type == SHT_REL) {
3751 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3752 shnum, stab, strtab );
3756 if (shdr[shnum].sh_type == SHT_RELA) {
3757 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3758 shnum, stab, strtab );
3763 #if defined(powerpc_HOST_ARCH)
3764 ocFlushInstructionCache( oc );
3772 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3773 * at the front. The following utility functions pack and unpack instructions, and
3774 * take care of the most common relocations.
3777 #ifdef ia64_HOST_ARCH
3780 ia64_extract_instruction(Elf64_Xword *target)
3783 int slot = (Elf_Addr)target & 3;
3784 target = (Elf_Addr)target & ~3;
3792 return ((w1 >> 5) & 0x1ffffffffff);
3794 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3798 barf("ia64_extract_instruction: invalid slot %p", target);
3803 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3805 int slot = (Elf_Addr)target & 3;
3806 target = (Elf_Addr)target & ~3;
3811 *target |= value << 5;
3814 *target |= value << 46;
3815 *(target+1) |= value >> 18;
3818 *(target+1) |= value << 23;
3824 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3826 Elf64_Xword instruction;
3827 Elf64_Sxword rel_value;
3829 rel_value = value - gp_val;
3830 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3831 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3833 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3834 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3835 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3836 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3837 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3838 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3842 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3844 Elf64_Xword instruction;
3845 Elf64_Sxword rel_value;
3848 entry = allocatePLTEntry(value, oc);
3850 rel_value = (entry >> 4) - (target >> 4);
3851 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3852 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3854 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3855 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3856 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3857 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3863 * PowerPC & X86_64 ELF specifics
3866 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3868 static int ocAllocateSymbolExtras_ELF( ObjectCode *oc )
3874 ehdr = (Elf_Ehdr *) oc->image;
3875 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3877 for( i = 0; i < ehdr->e_shnum; i++ )
3878 if( shdr[i].sh_type == SHT_SYMTAB )
3881 if( i == ehdr->e_shnum )
3883 errorBelch( "This ELF file contains no symtab" );
3887 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3889 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3890 (int) shdr[i].sh_entsize, (int) sizeof( Elf_Sym ) );
3895 return ocAllocateSymbolExtras( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3898 #endif /* powerpc */
3902 /* --------------------------------------------------------------------------
3904 * ------------------------------------------------------------------------*/
3906 #if defined(OBJFORMAT_MACHO)
3909 Support for MachO linking on Darwin/MacOS X
3910 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3912 I hereby formally apologize for the hackish nature of this code.
3913 Things that need to be done:
3914 *) implement ocVerifyImage_MachO
3915 *) add still more sanity checks.
3918 #if x86_64_HOST_ARCH || powerpc64_HOST_ARCH
3919 #define mach_header mach_header_64
3920 #define segment_command segment_command_64
3921 #define section section_64
3922 #define nlist nlist_64
3925 #ifdef powerpc_HOST_ARCH
3926 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3928 struct mach_header *header = (struct mach_header *) oc->image;
3929 struct load_command *lc = (struct load_command *) (header + 1);
3932 for( i = 0; i < header->ncmds; i++ )
3934 if( lc->cmd == LC_SYMTAB )
3936 // Find out the first and last undefined external
3937 // symbol, so we don't have to allocate too many
3939 struct symtab_command *symLC = (struct symtab_command *) lc;
3940 unsigned min = symLC->nsyms, max = 0;
3941 struct nlist *nlist =
3942 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3944 for(i=0;i<symLC->nsyms;i++)
3946 if(nlist[i].n_type & N_STAB)
3948 else if(nlist[i].n_type & N_EXT)
3950 if((nlist[i].n_type & N_TYPE) == N_UNDF
3951 && (nlist[i].n_value == 0))
3961 return ocAllocateSymbolExtras(oc, max - min + 1, min);
3966 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3968 return ocAllocateSymbolExtras(oc,0,0);
3971 #ifdef x86_64_HOST_ARCH
3972 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3974 struct mach_header *header = (struct mach_header *) oc->image;
3975 struct load_command *lc = (struct load_command *) (header + 1);
3978 for( i = 0; i < header->ncmds; i++ )
3980 if( lc->cmd == LC_SYMTAB )
3982 // Just allocate one entry for every symbol
3983 struct symtab_command *symLC = (struct symtab_command *) lc;
3985 return ocAllocateSymbolExtras(oc, symLC->nsyms, 0);
3988 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3990 return ocAllocateSymbolExtras(oc,0,0);
3994 static int ocVerifyImage_MachO(ObjectCode* oc)
3996 char *image = (char*) oc->image;
3997 struct mach_header *header = (struct mach_header*) image;
3999 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
4000 if(header->magic != MH_MAGIC_64)
4003 if(header->magic != MH_MAGIC)
4006 // FIXME: do some more verifying here
4010 static int resolveImports(
4013 struct symtab_command *symLC,
4014 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
4015 unsigned long *indirectSyms,
4016 struct nlist *nlist)
4019 size_t itemSize = 4;
4022 int isJumpTable = 0;
4023 if(!strcmp(sect->sectname,"__jump_table"))
4027 ASSERT(sect->reserved2 == itemSize);
4031 for(i=0; i*itemSize < sect->size;i++)
4033 // according to otool, reserved1 contains the first index into the indirect symbol table
4034 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
4035 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4038 if((symbol->n_type & N_TYPE) == N_UNDF
4039 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
4040 addr = (void*) (symbol->n_value);
4042 addr = lookupSymbol(nm);
4045 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
4053 checkProddableBlock(oc,image + sect->offset + i*itemSize);
4054 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
4055 *(unsigned*)(image + sect->offset + i*itemSize + 1)
4056 = (char*)addr - (image + sect->offset + i*itemSize + 5);
4061 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
4062 ((void**)(image + sect->offset))[i] = addr;
4069 static unsigned long relocateAddress(
4072 struct section* sections,
4073 unsigned long address)
4076 for(i = 0; i < nSections; i++)
4078 if(sections[i].addr <= address
4079 && address < sections[i].addr + sections[i].size)
4081 return (unsigned long)oc->image
4082 + sections[i].offset + address - sections[i].addr;
4085 barf("Invalid Mach-O file:"
4086 "Address out of bounds while relocating object file");
4090 static int relocateSection(
4093 struct symtab_command *symLC, struct nlist *nlist,
4094 int nSections, struct section* sections, struct section *sect)
4096 struct relocation_info *relocs;
4099 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
4101 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
4103 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
4105 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
4109 relocs = (struct relocation_info*) (image + sect->reloff);
4113 #ifdef x86_64_HOST_ARCH
4114 struct relocation_info *reloc = &relocs[i];
4116 char *thingPtr = image + sect->offset + reloc->r_address;
4118 /* We shouldn't need to initialise this, but gcc on OS X 64 bit
4119 complains that it may be used uninitialized if we don't */
4122 int type = reloc->r_type;
4124 checkProddableBlock(oc,thingPtr);
4125 switch(reloc->r_length)
4128 thing = *(uint8_t*)thingPtr;
4129 baseValue = (uint64_t)thingPtr + 1;
4132 thing = *(uint16_t*)thingPtr;
4133 baseValue = (uint64_t)thingPtr + 2;
4136 thing = *(uint32_t*)thingPtr;
4137 baseValue = (uint64_t)thingPtr + 4;
4140 thing = *(uint64_t*)thingPtr;
4141 baseValue = (uint64_t)thingPtr + 8;
4144 barf("Unknown size.");
4147 if(type == X86_64_RELOC_GOT
4148 || type == X86_64_RELOC_GOT_LOAD)
4150 ASSERT(reloc->r_extern);
4151 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)->addr;
4153 type = X86_64_RELOC_SIGNED;
4155 else if(reloc->r_extern)
4157 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4158 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4159 if(symbol->n_value == 0)
4160 value = (uint64_t) lookupSymbol(nm);
4162 value = relocateAddress(oc, nSections, sections,
4167 value = sections[reloc->r_symbolnum-1].offset
4168 - sections[reloc->r_symbolnum-1].addr
4172 if(type == X86_64_RELOC_BRANCH)
4174 if((int32_t)(value - baseValue) != (int64_t)(value - baseValue))
4176 ASSERT(reloc->r_extern);
4177 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)
4180 ASSERT((int32_t)(value - baseValue) == (int64_t)(value - baseValue));
4181 type = X86_64_RELOC_SIGNED;
4186 case X86_64_RELOC_UNSIGNED:
4187 ASSERT(!reloc->r_pcrel);
4190 case X86_64_RELOC_SIGNED:
4191 ASSERT(reloc->r_pcrel);
4192 thing += value - baseValue;
4194 case X86_64_RELOC_SUBTRACTOR:
4195 ASSERT(!reloc->r_pcrel);
4199 barf("unkown relocation");
4202 switch(reloc->r_length)
4205 *(uint8_t*)thingPtr = thing;
4208 *(uint16_t*)thingPtr = thing;
4211 *(uint32_t*)thingPtr = thing;
4214 *(uint64_t*)thingPtr = thing;
4218 if(relocs[i].r_address & R_SCATTERED)
4220 struct scattered_relocation_info *scat =
4221 (struct scattered_relocation_info*) &relocs[i];
4225 if(scat->r_length == 2)
4227 unsigned long word = 0;
4228 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
4229 checkProddableBlock(oc,wordPtr);
4231 // Note on relocation types:
4232 // i386 uses the GENERIC_RELOC_* types,
4233 // while ppc uses special PPC_RELOC_* types.
4234 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
4235 // in both cases, all others are different.
4236 // Therefore, we use GENERIC_RELOC_VANILLA
4237 // and GENERIC_RELOC_PAIR instead of the PPC variants,
4238 // and use #ifdefs for the other types.
4240 // Step 1: Figure out what the relocated value should be
4241 if(scat->r_type == GENERIC_RELOC_VANILLA)
4243 word = *wordPtr + (unsigned long) relocateAddress(
4250 #ifdef powerpc_HOST_ARCH
4251 else if(scat->r_type == PPC_RELOC_SECTDIFF
4252 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
4253 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
4254 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
4256 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
4259 struct scattered_relocation_info *pair =
4260 (struct scattered_relocation_info*) &relocs[i+1];
4262 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
4263 barf("Invalid Mach-O file: "
4264 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
4266 word = (unsigned long)
4267 (relocateAddress(oc, nSections, sections, scat->r_value)
4268 - relocateAddress(oc, nSections, sections, pair->r_value));
4271 #ifdef powerpc_HOST_ARCH
4272 else if(scat->r_type == PPC_RELOC_HI16
4273 || scat->r_type == PPC_RELOC_LO16
4274 || scat->r_type == PPC_RELOC_HA16
4275 || scat->r_type == PPC_RELOC_LO14)
4276 { // these are generated by label+offset things
4277 struct relocation_info *pair = &relocs[i+1];
4278 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
4279 barf("Invalid Mach-O file: "
4280 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
4282 if(scat->r_type == PPC_RELOC_LO16)
4284 word = ((unsigned short*) wordPtr)[1];
4285 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4287 else if(scat->r_type == PPC_RELOC_LO14)
4289 barf("Unsupported Relocation: PPC_RELOC_LO14");
4290 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
4291 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4293 else if(scat->r_type == PPC_RELOC_HI16)
4295 word = ((unsigned short*) wordPtr)[1] << 16;
4296 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4298 else if(scat->r_type == PPC_RELOC_HA16)
4300 word = ((unsigned short*) wordPtr)[1] << 16;
4301 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4305 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4312 continue; // ignore the others
4314 #ifdef powerpc_HOST_ARCH
4315 if(scat->r_type == GENERIC_RELOC_VANILLA
4316 || scat->r_type == PPC_RELOC_SECTDIFF)
4318 if(scat->r_type == GENERIC_RELOC_VANILLA
4319 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4324 #ifdef powerpc_HOST_ARCH
4325 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4327 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4329 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4331 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4333 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4335 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4336 + ((word & (1<<15)) ? 1 : 0);
4342 continue; // FIXME: I hope it's OK to ignore all the others.
4346 struct relocation_info *reloc = &relocs[i];
4347 if(reloc->r_pcrel && !reloc->r_extern)
4350 if(reloc->r_length == 2)
4352 unsigned long word = 0;
4353 #ifdef powerpc_HOST_ARCH
4354 unsigned long jumpIsland = 0;
4355 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4356 // to avoid warning and to catch
4360 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4361 checkProddableBlock(oc,wordPtr);
4363 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4367 #ifdef powerpc_HOST_ARCH
4368 else if(reloc->r_type == PPC_RELOC_LO16)
4370 word = ((unsigned short*) wordPtr)[1];
4371 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4373 else if(reloc->r_type == PPC_RELOC_HI16)
4375 word = ((unsigned short*) wordPtr)[1] << 16;
4376 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4378 else if(reloc->r_type == PPC_RELOC_HA16)
4380 word = ((unsigned short*) wordPtr)[1] << 16;
4381 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4383 else if(reloc->r_type == PPC_RELOC_BR24)
4386 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4390 if(!reloc->r_extern)
4393 sections[reloc->r_symbolnum-1].offset
4394 - sections[reloc->r_symbolnum-1].addr
4401 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4402 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4403 void *symbolAddress = lookupSymbol(nm);
4406 errorBelch("\nunknown symbol `%s'", nm);
4412 #ifdef powerpc_HOST_ARCH
4413 // In the .o file, this should be a relative jump to NULL
4414 // and we'll change it to a relative jump to the symbol
4415 ASSERT(word + reloc->r_address == 0);
4416 jumpIsland = (unsigned long)
4417 &makeSymbolExtra(oc,
4419 (unsigned long) symbolAddress)
4423 offsetToJumpIsland = word + jumpIsland
4424 - (((long)image) + sect->offset - sect->addr);
4427 word += (unsigned long) symbolAddress
4428 - (((long)image) + sect->offset - sect->addr);
4432 word += (unsigned long) symbolAddress;
4436 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4441 #ifdef powerpc_HOST_ARCH
4442 else if(reloc->r_type == PPC_RELOC_LO16)
4444 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4447 else if(reloc->r_type == PPC_RELOC_HI16)
4449 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4452 else if(reloc->r_type == PPC_RELOC_HA16)
4454 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4455 + ((word & (1<<15)) ? 1 : 0);
4458 else if(reloc->r_type == PPC_RELOC_BR24)
4460 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4462 // The branch offset is too large.
4463 // Therefore, we try to use a jump island.
4466 barf("unconditional relative branch out of range: "
4467 "no jump island available");
4470 word = offsetToJumpIsland;
4471 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4472 barf("unconditional relative branch out of range: "
4473 "jump island out of range");
4475 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4480 barf("\nunknown relocation %d",reloc->r_type);
4488 static int ocGetNames_MachO(ObjectCode* oc)
4490 char *image = (char*) oc->image;
4491 struct mach_header *header = (struct mach_header*) image;
4492 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4493 unsigned i,curSymbol = 0;
4494 struct segment_command *segLC = NULL;
4495 struct section *sections;
4496 struct symtab_command *symLC = NULL;
4497 struct nlist *nlist;
4498 unsigned long commonSize = 0;
4499 char *commonStorage = NULL;
4500 unsigned long commonCounter;
4502 for(i=0;i<header->ncmds;i++)
4504 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4505 segLC = (struct segment_command*) lc;
4506 else if(lc->cmd == LC_SYMTAB)
4507 symLC = (struct symtab_command*) lc;
4508 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4511 sections = (struct section*) (segLC+1);
4512 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4516 barf("ocGetNames_MachO: no segment load command");
4518 for(i=0;i<segLC->nsects;i++)
4520 if(sections[i].size == 0)
4523 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4525 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4526 "ocGetNames_MachO(common symbols)");
4527 sections[i].offset = zeroFillArea - image;
4530 if(!strcmp(sections[i].sectname,"__text"))
4531 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4532 (void*) (image + sections[i].offset),
4533 (void*) (image + sections[i].offset + sections[i].size));
4534 else if(!strcmp(sections[i].sectname,"__const"))
4535 addSection(oc, SECTIONKIND_RWDATA,
4536 (void*) (image + sections[i].offset),
4537 (void*) (image + sections[i].offset + sections[i].size));
4538 else if(!strcmp(sections[i].sectname,"__data"))
4539 addSection(oc, SECTIONKIND_RWDATA,
4540 (void*) (image + sections[i].offset),
4541 (void*) (image + sections[i].offset + sections[i].size));
4542 else if(!strcmp(sections[i].sectname,"__bss")
4543 || !strcmp(sections[i].sectname,"__common"))
4544 addSection(oc, SECTIONKIND_RWDATA,
4545 (void*) (image + sections[i].offset),
4546 (void*) (image + sections[i].offset + sections[i].size));
4548 addProddableBlock(oc, (void*) (image + sections[i].offset),
4552 // count external symbols defined here
4556 for(i=0;i<symLC->nsyms;i++)
4558 if(nlist[i].n_type & N_STAB)
4560 else if(nlist[i].n_type & N_EXT)
4562 if((nlist[i].n_type & N_TYPE) == N_UNDF
4563 && (nlist[i].n_value != 0))
4565 commonSize += nlist[i].n_value;
4568 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4573 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4574 "ocGetNames_MachO(oc->symbols)");
4578 for(i=0;i<symLC->nsyms;i++)
4580 if(nlist[i].n_type & N_STAB)
4582 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4584 if(nlist[i].n_type & N_EXT)
4586 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4587 if((nlist[i].n_desc & N_WEAK_DEF) && lookupSymbol(nm))
4588 ; // weak definition, and we already have a definition
4591 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4593 + sections[nlist[i].n_sect-1].offset
4594 - sections[nlist[i].n_sect-1].addr
4595 + nlist[i].n_value);
4596 oc->symbols[curSymbol++] = nm;
4603 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4604 commonCounter = (unsigned long)commonStorage;
4607 for(i=0;i<symLC->nsyms;i++)
4609 if((nlist[i].n_type & N_TYPE) == N_UNDF
4610 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4612 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4613 unsigned long sz = nlist[i].n_value;
4615 nlist[i].n_value = commonCounter;
4617 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4618 (void*)commonCounter);
4619 oc->symbols[curSymbol++] = nm;
4621 commonCounter += sz;
4628 static int ocResolve_MachO(ObjectCode* oc)
4630 char *image = (char*) oc->image;
4631 struct mach_header *header = (struct mach_header*) image;
4632 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4634 struct segment_command *segLC = NULL;
4635 struct section *sections;
4636 struct symtab_command *symLC = NULL;
4637 struct dysymtab_command *dsymLC = NULL;
4638 struct nlist *nlist;
4640 for(i=0;i<header->ncmds;i++)
4642 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4643 segLC = (struct segment_command*) lc;
4644 else if(lc->cmd == LC_SYMTAB)
4645 symLC = (struct symtab_command*) lc;
4646 else if(lc->cmd == LC_DYSYMTAB)
4647 dsymLC = (struct dysymtab_command*) lc;
4648 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4651 sections = (struct section*) (segLC+1);
4652 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4657 unsigned long *indirectSyms
4658 = (unsigned long*) (image + dsymLC->indirectsymoff);
4660 for(i=0;i<segLC->nsects;i++)
4662 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4663 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4664 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4666 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4669 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4670 || !strcmp(sections[i].sectname,"__pointers"))
4672 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4675 else if(!strcmp(sections[i].sectname,"__jump_table"))
4677 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4683 for(i=0;i<segLC->nsects;i++)
4685 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4689 #if defined (powerpc_HOST_ARCH)
4690 ocFlushInstructionCache( oc );
4696 #ifdef powerpc_HOST_ARCH
4698 * The Mach-O object format uses leading underscores. But not everywhere.
4699 * There is a small number of runtime support functions defined in
4700 * libcc_dynamic.a whose name does not have a leading underscore.
4701 * As a consequence, we can't get their address from C code.
4702 * We have to use inline assembler just to take the address of a function.
4706 static void machoInitSymbolsWithoutUnderscore()
4708 extern void* symbolsWithoutUnderscore[];
4709 void **p = symbolsWithoutUnderscore;
4710 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4712 #undef SymI_NeedsProto
4713 #define SymI_NeedsProto(x) \
4714 __asm__ volatile(".long " # x);
4716 RTS_MACHO_NOUNDERLINE_SYMBOLS
4718 __asm__ volatile(".text");
4720 #undef SymI_NeedsProto
4721 #define SymI_NeedsProto(x) \
4722 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4724 RTS_MACHO_NOUNDERLINE_SYMBOLS
4726 #undef SymI_NeedsProto
4731 * Figure out by how much to shift the entire Mach-O file in memory
4732 * when loading so that its single segment ends up 16-byte-aligned
4734 static int machoGetMisalignment( FILE * f )
4736 struct mach_header header;
4739 fread(&header, sizeof(header), 1, f);
4742 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
4743 if(header.magic != MH_MAGIC_64)
4746 if(header.magic != MH_MAGIC)
4750 misalignment = (header.sizeofcmds + sizeof(header))
4753 return misalignment ? (16 - misalignment) : 0;