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(rtsSupportsBoundThreads) \
756 SymI_HasProto(__hscore_get_saved_termios) \
757 SymI_HasProto(__hscore_set_saved_termios) \
758 SymI_HasProto(setProgArgv) \
759 SymI_HasProto(startupHaskell) \
760 SymI_HasProto(shutdownHaskell) \
761 SymI_HasProto(shutdownHaskellAndExit) \
762 SymI_HasProto(stable_ptr_table) \
763 SymI_HasProto(stackOverflow) \
764 SymI_HasProto(stg_CAF_BLACKHOLE_info) \
765 SymI_HasProto(__stg_EAGER_BLACKHOLE_info) \
766 SymI_HasProto(awakenBlockedQueue) \
767 SymI_HasProto(startTimer) \
768 SymI_HasProto(stg_CHARLIKE_closure) \
769 SymI_HasProto(stg_MVAR_CLEAN_info) \
770 SymI_HasProto(stg_MVAR_DIRTY_info) \
771 SymI_HasProto(stg_IND_STATIC_info) \
772 SymI_HasProto(stg_INTLIKE_closure) \
773 SymI_HasProto(stg_MUT_ARR_PTRS_DIRTY_info) \
774 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN_info) \
775 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN0_info) \
776 SymI_HasProto(stg_WEAK_info) \
777 SymI_HasProto(stg_ap_v_info) \
778 SymI_HasProto(stg_ap_f_info) \
779 SymI_HasProto(stg_ap_d_info) \
780 SymI_HasProto(stg_ap_l_info) \
781 SymI_HasProto(stg_ap_n_info) \
782 SymI_HasProto(stg_ap_p_info) \
783 SymI_HasProto(stg_ap_pv_info) \
784 SymI_HasProto(stg_ap_pp_info) \
785 SymI_HasProto(stg_ap_ppv_info) \
786 SymI_HasProto(stg_ap_ppp_info) \
787 SymI_HasProto(stg_ap_pppv_info) \
788 SymI_HasProto(stg_ap_pppp_info) \
789 SymI_HasProto(stg_ap_ppppp_info) \
790 SymI_HasProto(stg_ap_pppppp_info) \
791 SymI_HasProto(stg_ap_0_fast) \
792 SymI_HasProto(stg_ap_v_fast) \
793 SymI_HasProto(stg_ap_f_fast) \
794 SymI_HasProto(stg_ap_d_fast) \
795 SymI_HasProto(stg_ap_l_fast) \
796 SymI_HasProto(stg_ap_n_fast) \
797 SymI_HasProto(stg_ap_p_fast) \
798 SymI_HasProto(stg_ap_pv_fast) \
799 SymI_HasProto(stg_ap_pp_fast) \
800 SymI_HasProto(stg_ap_ppv_fast) \
801 SymI_HasProto(stg_ap_ppp_fast) \
802 SymI_HasProto(stg_ap_pppv_fast) \
803 SymI_HasProto(stg_ap_pppp_fast) \
804 SymI_HasProto(stg_ap_ppppp_fast) \
805 SymI_HasProto(stg_ap_pppppp_fast) \
806 SymI_HasProto(stg_ap_1_upd_info) \
807 SymI_HasProto(stg_ap_2_upd_info) \
808 SymI_HasProto(stg_ap_3_upd_info) \
809 SymI_HasProto(stg_ap_4_upd_info) \
810 SymI_HasProto(stg_ap_5_upd_info) \
811 SymI_HasProto(stg_ap_6_upd_info) \
812 SymI_HasProto(stg_ap_7_upd_info) \
813 SymI_HasProto(stg_exit) \
814 SymI_HasProto(stg_sel_0_upd_info) \
815 SymI_HasProto(stg_sel_10_upd_info) \
816 SymI_HasProto(stg_sel_11_upd_info) \
817 SymI_HasProto(stg_sel_12_upd_info) \
818 SymI_HasProto(stg_sel_13_upd_info) \
819 SymI_HasProto(stg_sel_14_upd_info) \
820 SymI_HasProto(stg_sel_15_upd_info) \
821 SymI_HasProto(stg_sel_1_upd_info) \
822 SymI_HasProto(stg_sel_2_upd_info) \
823 SymI_HasProto(stg_sel_3_upd_info) \
824 SymI_HasProto(stg_sel_4_upd_info) \
825 SymI_HasProto(stg_sel_5_upd_info) \
826 SymI_HasProto(stg_sel_6_upd_info) \
827 SymI_HasProto(stg_sel_7_upd_info) \
828 SymI_HasProto(stg_sel_8_upd_info) \
829 SymI_HasProto(stg_sel_9_upd_info) \
830 SymI_HasProto(stg_upd_frame_info) \
831 SymI_HasProto(suspendThread) \
832 SymI_HasProto(takeMVarzh_fast) \
833 SymI_HasProto(threadStatuszh_fast) \
834 SymI_HasProto(timesIntegerzh_fast) \
835 SymI_HasProto(tryPutMVarzh_fast) \
836 SymI_HasProto(tryTakeMVarzh_fast) \
837 SymI_HasProto(unblockAsyncExceptionszh_fast) \
838 SymI_HasProto(unloadObj) \
839 SymI_HasProto(unsafeThawArrayzh_fast) \
840 SymI_HasProto(waitReadzh_fast) \
841 SymI_HasProto(waitWritezh_fast) \
842 SymI_HasProto(word2Integerzh_fast) \
843 SymI_HasProto(writeTVarzh_fast) \
844 SymI_HasProto(xorIntegerzh_fast) \
845 SymI_HasProto(yieldzh_fast) \
846 SymI_NeedsProto(stg_interp_constr_entry) \
847 SymI_HasProto(allocateExec) \
848 SymI_HasProto(freeExec) \
849 SymI_HasProto(getAllocations) \
850 SymI_HasProto(revertCAFs) \
851 SymI_HasProto(RtsFlags) \
852 SymI_NeedsProto(rts_breakpoint_io_action) \
853 SymI_NeedsProto(rts_stop_next_breakpoint) \
854 SymI_NeedsProto(rts_stop_on_exception) \
855 SymI_HasProto(stopTimer) \
856 SymI_HasProto(n_capabilities) \
857 SymI_HasProto(traceCcszh_fast) \
858 RTS_USER_SIGNALS_SYMBOLS
860 #ifdef SUPPORT_LONG_LONGS
861 #define RTS_LONG_LONG_SYMS \
862 SymI_HasProto(int64ToIntegerzh_fast) \
863 SymI_HasProto(word64ToIntegerzh_fast)
865 #define RTS_LONG_LONG_SYMS /* nothing */
868 // 64-bit support functions in libgcc.a
869 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
870 #define RTS_LIBGCC_SYMBOLS \
871 SymI_NeedsProto(__divdi3) \
872 SymI_NeedsProto(__udivdi3) \
873 SymI_NeedsProto(__moddi3) \
874 SymI_NeedsProto(__umoddi3) \
875 SymI_NeedsProto(__muldi3) \
876 SymI_NeedsProto(__ashldi3) \
877 SymI_NeedsProto(__ashrdi3) \
878 SymI_NeedsProto(__lshrdi3) \
879 SymI_NeedsProto(__eprintf)
880 #elif defined(ia64_HOST_ARCH)
881 #define RTS_LIBGCC_SYMBOLS \
882 SymI_NeedsProto(__divdi3) \
883 SymI_NeedsProto(__udivdi3) \
884 SymI_NeedsProto(__moddi3) \
885 SymI_NeedsProto(__umoddi3) \
886 SymI_NeedsProto(__divsf3) \
887 SymI_NeedsProto(__divdf3)
889 #define RTS_LIBGCC_SYMBOLS
892 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
893 // Symbols that don't have a leading underscore
894 // on Mac OS X. They have to receive special treatment,
895 // see machoInitSymbolsWithoutUnderscore()
896 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
897 SymI_NeedsProto(saveFP) \
898 SymI_NeedsProto(restFP)
901 /* entirely bogus claims about types of these symbols */
902 #define SymI_NeedsProto(vvv) extern void vvv(void);
903 #if defined(__PIC__) && defined(mingw32_TARGET_OS)
904 #define SymE_HasProto(vvv) SymE_HasProto(vvv);
905 #define SymE_NeedsProto(vvv) extern void _imp__ ## vvv (void);
907 #define SymE_NeedsProto(vvv) SymI_NeedsProto(vvv);
908 #define SymE_HasProto(vvv) SymI_HasProto(vvv)
910 #define SymI_HasProto(vvv) /**/
911 #define SymI_HasProto_redirect(vvv,xxx) /**/
915 RTS_POSIX_ONLY_SYMBOLS
916 RTS_MINGW_ONLY_SYMBOLS
917 RTS_CYGWIN_ONLY_SYMBOLS
918 RTS_DARWIN_ONLY_SYMBOLS
921 #undef SymI_NeedsProto
923 #undef SymI_HasProto_redirect
925 #undef SymE_NeedsProto
927 #ifdef LEADING_UNDERSCORE
928 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
930 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
933 #define SymI_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
935 #define SymE_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
936 (void*)DLL_IMPORT_DATA_REF(vvv) },
938 #define SymI_NeedsProto(vvv) SymI_HasProto(vvv)
939 #define SymE_NeedsProto(vvv) SymE_HasProto(vvv)
941 // SymI_HasProto_redirect allows us to redirect references to one symbol to
942 // another symbol. See newCAF/newDynCAF for an example.
943 #define SymI_HasProto_redirect(vvv,xxx) \
944 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
947 static RtsSymbolVal rtsSyms[] = {
951 RTS_POSIX_ONLY_SYMBOLS
952 RTS_MINGW_ONLY_SYMBOLS
953 RTS_CYGWIN_ONLY_SYMBOLS
954 RTS_DARWIN_ONLY_SYMBOLS
957 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
958 // dyld stub code contains references to this,
959 // but it should never be called because we treat
960 // lazy pointers as nonlazy.
961 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
963 { 0, 0 } /* sentinel */
968 /* -----------------------------------------------------------------------------
969 * Insert symbols into hash tables, checking for duplicates.
972 static void ghciInsertStrHashTable ( char* obj_name,
978 if (lookupHashTable(table, (StgWord)key) == NULL)
980 insertStrHashTable(table, (StgWord)key, data);
985 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
987 "whilst processing object file\n"
989 "This could be caused by:\n"
990 " * Loading two different object files which export the same symbol\n"
991 " * Specifying the same object file twice on the GHCi command line\n"
992 " * An incorrect `package.conf' entry, causing some object to be\n"
994 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
1001 /* -----------------------------------------------------------------------------
1002 * initialize the object linker
1006 static int linker_init_done = 0 ;
1008 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1009 static void *dl_prog_handle;
1017 /* Make initLinker idempotent, so we can call it
1018 before evey relevant operation; that means we
1019 don't need to initialise the linker separately */
1020 if (linker_init_done == 1) { return; } else {
1021 linker_init_done = 1;
1024 stablehash = allocStrHashTable();
1025 symhash = allocStrHashTable();
1027 /* populate the symbol table with stuff from the RTS */
1028 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
1029 ghciInsertStrHashTable("(GHCi built-in symbols)",
1030 symhash, sym->lbl, sym->addr);
1032 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1033 machoInitSymbolsWithoutUnderscore();
1036 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1037 # if defined(RTLD_DEFAULT)
1038 dl_prog_handle = RTLD_DEFAULT;
1040 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
1041 # endif /* RTLD_DEFAULT */
1044 #if defined(x86_64_HOST_ARCH)
1045 if (RtsFlags.MiscFlags.linkerMemBase != 0) {
1046 // User-override for mmap_32bit_base
1047 mmap_32bit_base = (void*)RtsFlags.MiscFlags.linkerMemBase;
1051 #if defined(mingw32_HOST_OS)
1053 * These two libraries cause problems when added to the static link,
1054 * but are necessary for resolving symbols in GHCi, hence we load
1055 * them manually here.
1062 /* -----------------------------------------------------------------------------
1063 * Loading DLL or .so dynamic libraries
1064 * -----------------------------------------------------------------------------
1066 * Add a DLL from which symbols may be found. In the ELF case, just
1067 * do RTLD_GLOBAL-style add, so no further messing around needs to
1068 * happen in order that symbols in the loaded .so are findable --
1069 * lookupSymbol() will subsequently see them by dlsym on the program's
1070 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
1072 * In the PEi386 case, open the DLLs and put handles to them in a
1073 * linked list. When looking for a symbol, try all handles in the
1074 * list. This means that we need to load even DLLs that are guaranteed
1075 * to be in the ghc.exe image already, just so we can get a handle
1076 * to give to loadSymbol, so that we can find the symbols. For such
1077 * libraries, the LoadLibrary call should be a no-op except for returning
1082 #if defined(OBJFORMAT_PEi386)
1083 /* A record for storing handles into DLLs. */
1088 struct _OpenedDLL* next;
1093 /* A list thereof. */
1094 static OpenedDLL* opened_dlls = NULL;
1098 addDLL( char *dll_name )
1100 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1101 /* ------------------- ELF DLL loader ------------------- */
1107 // omitted: RTLD_NOW
1108 // see http://www.haskell.org/pipermail/cvs-ghc/2007-September/038570.html
1109 hdl= dlopen(dll_name, RTLD_LAZY | RTLD_GLOBAL);
1112 /* dlopen failed; return a ptr to the error msg. */
1114 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1121 # elif defined(OBJFORMAT_PEi386)
1122 /* ------------------- Win32 DLL loader ------------------- */
1130 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1132 /* See if we've already got it, and ignore if so. */
1133 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1134 if (0 == strcmp(o_dll->name, dll_name))
1138 /* The file name has no suffix (yet) so that we can try
1139 both foo.dll and foo.drv
1141 The documentation for LoadLibrary says:
1142 If no file name extension is specified in the lpFileName
1143 parameter, the default library extension .dll is
1144 appended. However, the file name string can include a trailing
1145 point character (.) to indicate that the module name has no
1148 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1149 sprintf(buf, "%s.DLL", dll_name);
1150 instance = LoadLibrary(buf);
1151 if (instance == NULL) {
1152 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1153 // KAA: allow loading of drivers (like winspool.drv)
1154 sprintf(buf, "%s.DRV", dll_name);
1155 instance = LoadLibrary(buf);
1156 if (instance == NULL) {
1157 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1158 // #1883: allow loading of unix-style libfoo.dll DLLs
1159 sprintf(buf, "lib%s.DLL", dll_name);
1160 instance = LoadLibrary(buf);
1161 if (instance == NULL) {
1168 /* Add this DLL to the list of DLLs in which to search for symbols. */
1169 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1170 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1171 strcpy(o_dll->name, dll_name);
1172 o_dll->instance = instance;
1173 o_dll->next = opened_dlls;
1174 opened_dlls = o_dll;
1180 sysErrorBelch(dll_name);
1182 /* LoadLibrary failed; return a ptr to the error msg. */
1183 return "addDLL: could not load DLL";
1186 barf("addDLL: not implemented on this platform");
1190 /* -----------------------------------------------------------------------------
1191 * insert a stable symbol in the hash table
1195 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1197 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1201 /* -----------------------------------------------------------------------------
1202 * insert a symbol in the hash table
1205 insertSymbol(char* obj_name, char* key, void* data)
1207 ghciInsertStrHashTable(obj_name, symhash, key, data);
1210 /* -----------------------------------------------------------------------------
1211 * lookup a symbol in the hash table
1214 lookupSymbol( char *lbl )
1218 ASSERT(symhash != NULL);
1219 val = lookupStrHashTable(symhash, lbl);
1222 # if defined(OBJFORMAT_ELF)
1223 return dlsym(dl_prog_handle, lbl);
1224 # elif defined(OBJFORMAT_MACHO)
1226 /* On OS X 10.3 and later, we use dlsym instead of the old legacy
1229 HACK: On OS X, global symbols are prefixed with an underscore.
1230 However, dlsym wants us to omit the leading underscore from the
1231 symbol name. For now, we simply strip it off here (and ONLY
1234 ASSERT(lbl[0] == '_');
1235 return dlsym(dl_prog_handle, lbl+1);
1237 if(NSIsSymbolNameDefined(lbl)) {
1238 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1239 return NSAddressOfSymbol(symbol);
1243 # endif /* HAVE_DLFCN_H */
1244 # elif defined(OBJFORMAT_PEi386)
1247 sym = lookupSymbolInDLLs(lbl);
1248 if (sym != NULL) { return sym; };
1250 // Also try looking up the symbol without the @N suffix. Some
1251 // DLLs have the suffixes on their symbols, some don't.
1252 zapTrailingAtSign ( lbl );
1253 sym = lookupSymbolInDLLs(lbl);
1254 if (sym != NULL) { return sym; };
1266 /* -----------------------------------------------------------------------------
1267 * Debugging aid: look in GHCi's object symbol tables for symbols
1268 * within DELTA bytes of the specified address, and show their names.
1271 void ghci_enquire ( char* addr );
1273 void ghci_enquire ( char* addr )
1278 const int DELTA = 64;
1283 for (oc = objects; oc; oc = oc->next) {
1284 for (i = 0; i < oc->n_symbols; i++) {
1285 sym = oc->symbols[i];
1286 if (sym == NULL) continue;
1289 a = lookupStrHashTable(symhash, sym);
1292 // debugBelch("ghci_enquire: can't find %s\n", sym);
1294 else if (addr-DELTA <= a && a <= addr+DELTA) {
1295 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1302 #ifdef ia64_HOST_ARCH
1303 static unsigned int PLTSize(void);
1307 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1310 mmapForLinker (size_t bytes, nat flags, int fd)
1312 void *map_addr = NULL;
1315 static nat fixed = 0;
1317 pagesize = getpagesize();
1318 size = ROUND_UP(bytes, pagesize);
1320 #if defined(x86_64_HOST_ARCH)
1323 if (mmap_32bit_base != 0) {
1324 map_addr = mmap_32bit_base;
1328 result = mmap(map_addr, size, PROT_EXEC|PROT_READ|PROT_WRITE,
1329 MAP_PRIVATE|TRY_MAP_32BIT|fixed|flags, fd, 0);
1331 if (result == MAP_FAILED) {
1332 sysErrorBelch("mmap %lu bytes at %p",(lnat)size,map_addr);
1333 errorBelch("Try specifying an address with +RTS -xm<addr> -RTS");
1334 stg_exit(EXIT_FAILURE);
1337 #if defined(x86_64_HOST_ARCH)
1338 if (mmap_32bit_base != 0) {
1339 if (result == map_addr) {
1340 mmap_32bit_base = map_addr + size;
1342 if ((W_)result > 0x80000000) {
1343 // oops, we were given memory over 2Gb
1344 #if defined(freebsd_HOST_OS)
1345 // Some platforms require MAP_FIXED. This is normally
1346 // a bad idea, because MAP_FIXED will overwrite
1347 // existing mappings.
1348 munmap(result,size);
1352 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);
1355 // hmm, we were given memory somewhere else, but it's
1356 // still under 2Gb so we can use it. Next time, ask
1357 // for memory right after the place we just got some
1358 mmap_32bit_base = (void*)result + size;
1362 if ((W_)result > 0x80000000) {
1363 // oops, we were given memory over 2Gb
1364 // ... try allocating memory somewhere else?;
1365 debugTrace(DEBUG_linker,"MAP_32BIT didn't work; gave us %lu bytes at 0x%p", bytes, result);
1366 munmap(result, size);
1368 // Set a base address and try again... (guess: 1Gb)
1369 mmap_32bit_base = (void*)0x40000000;
1379 /* -----------------------------------------------------------------------------
1380 * Load an obj (populate the global symbol table, but don't resolve yet)
1382 * Returns: 1 if ok, 0 on error.
1385 loadObj( char *path )
1397 /* debugBelch("loadObj %s\n", path ); */
1399 /* Check that we haven't already loaded this object.
1400 Ignore requests to load multiple times */
1404 for (o = objects; o; o = o->next) {
1405 if (0 == strcmp(o->fileName, path)) {
1407 break; /* don't need to search further */
1411 IF_DEBUG(linker, debugBelch(
1412 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1413 "same object file twice:\n"
1415 "GHCi will ignore this, but be warned.\n"
1417 return 1; /* success */
1421 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1423 # if defined(OBJFORMAT_ELF)
1424 oc->formatName = "ELF";
1425 # elif defined(OBJFORMAT_PEi386)
1426 oc->formatName = "PEi386";
1427 # elif defined(OBJFORMAT_MACHO)
1428 oc->formatName = "Mach-O";
1431 barf("loadObj: not implemented on this platform");
1434 r = stat(path, &st);
1435 if (r == -1) { return 0; }
1437 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1438 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1439 strcpy(oc->fileName, path);
1441 oc->fileSize = st.st_size;
1443 oc->sections = NULL;
1444 oc->proddables = NULL;
1446 /* chain it onto the list of objects */
1451 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1453 #if defined(openbsd_HOST_OS)
1454 fd = open(path, O_RDONLY, S_IRUSR);
1456 fd = open(path, O_RDONLY);
1459 barf("loadObj: can't open `%s'", path);
1461 #ifdef ia64_HOST_ARCH
1462 /* The PLT needs to be right before the object */
1465 pagesize = getpagesize();
1466 n = ROUND_UP(PLTSize(), pagesize);
1467 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1468 if (oc->plt == MAP_FAILED)
1469 barf("loadObj: can't allocate PLT");
1472 map_addr = oc->plt + n;
1474 n = ROUND_UP(oc->fileSize, pagesize);
1475 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1476 MAP_PRIVATE|TRY_MAP_32BIT, fd, 0);
1477 if (oc->image == MAP_FAILED)
1478 barf("loadObj: can't map `%s'", path);
1481 oc->image = mmapForLinker(oc->fileSize, 0, fd);
1486 #else /* !USE_MMAP */
1487 /* load the image into memory */
1488 f = fopen(path, "rb");
1490 barf("loadObj: can't read `%s'", path);
1492 # if defined(mingw32_HOST_OS)
1493 // TODO: We would like to use allocateExec here, but allocateExec
1494 // cannot currently allocate blocks large enough.
1495 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1496 PAGE_EXECUTE_READWRITE);
1497 # elif defined(darwin_HOST_OS)
1498 // In a Mach-O .o file, all sections can and will be misaligned
1499 // if the total size of the headers is not a multiple of the
1500 // desired alignment. This is fine for .o files that only serve
1501 // as input for the static linker, but it's not fine for us,
1502 // as SSE (used by gcc for floating point) and Altivec require
1503 // 16-byte alignment.
1504 // We calculate the correct alignment from the header before
1505 // reading the file, and then we misalign oc->image on purpose so
1506 // that the actual sections end up aligned again.
1507 oc->misalignment = machoGetMisalignment(f);
1508 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1509 oc->image += oc->misalignment;
1511 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1516 n = fread ( oc->image, 1, oc->fileSize, f );
1517 if (n != oc->fileSize)
1518 barf("loadObj: error whilst reading `%s'", path);
1521 #endif /* USE_MMAP */
1523 # if defined(OBJFORMAT_MACHO) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1524 r = ocAllocateSymbolExtras_MachO ( oc );
1525 if (!r) { return r; }
1526 # elif defined(OBJFORMAT_ELF) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1527 r = ocAllocateSymbolExtras_ELF ( oc );
1528 if (!r) { return r; }
1531 /* verify the in-memory image */
1532 # if defined(OBJFORMAT_ELF)
1533 r = ocVerifyImage_ELF ( oc );
1534 # elif defined(OBJFORMAT_PEi386)
1535 r = ocVerifyImage_PEi386 ( oc );
1536 # elif defined(OBJFORMAT_MACHO)
1537 r = ocVerifyImage_MachO ( oc );
1539 barf("loadObj: no verify method");
1541 if (!r) { return r; }
1543 /* build the symbol list for this image */
1544 # if defined(OBJFORMAT_ELF)
1545 r = ocGetNames_ELF ( oc );
1546 # elif defined(OBJFORMAT_PEi386)
1547 r = ocGetNames_PEi386 ( oc );
1548 # elif defined(OBJFORMAT_MACHO)
1549 r = ocGetNames_MachO ( oc );
1551 barf("loadObj: no getNames method");
1553 if (!r) { return r; }
1555 /* loaded, but not resolved yet */
1556 oc->status = OBJECT_LOADED;
1561 /* -----------------------------------------------------------------------------
1562 * resolve all the currently unlinked objects in memory
1564 * Returns: 1 if ok, 0 on error.
1574 for (oc = objects; oc; oc = oc->next) {
1575 if (oc->status != OBJECT_RESOLVED) {
1576 # if defined(OBJFORMAT_ELF)
1577 r = ocResolve_ELF ( oc );
1578 # elif defined(OBJFORMAT_PEi386)
1579 r = ocResolve_PEi386 ( oc );
1580 # elif defined(OBJFORMAT_MACHO)
1581 r = ocResolve_MachO ( oc );
1583 barf("resolveObjs: not implemented on this platform");
1585 if (!r) { return r; }
1586 oc->status = OBJECT_RESOLVED;
1592 /* -----------------------------------------------------------------------------
1593 * delete an object from the pool
1596 unloadObj( char *path )
1598 ObjectCode *oc, *prev;
1600 ASSERT(symhash != NULL);
1601 ASSERT(objects != NULL);
1606 for (oc = objects; oc; prev = oc, oc = oc->next) {
1607 if (!strcmp(oc->fileName,path)) {
1609 /* Remove all the mappings for the symbols within this
1614 for (i = 0; i < oc->n_symbols; i++) {
1615 if (oc->symbols[i] != NULL) {
1616 removeStrHashTable(symhash, oc->symbols[i], NULL);
1624 prev->next = oc->next;
1627 // We're going to leave this in place, in case there are
1628 // any pointers from the heap into it:
1629 // #ifdef mingw32_HOST_OS
1630 // VirtualFree(oc->image);
1632 // stgFree(oc->image);
1634 stgFree(oc->fileName);
1635 stgFree(oc->symbols);
1636 stgFree(oc->sections);
1642 errorBelch("unloadObj: can't find `%s' to unload", path);
1646 /* -----------------------------------------------------------------------------
1647 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1648 * which may be prodded during relocation, and abort if we try and write
1649 * outside any of these.
1651 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1654 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1655 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1659 pb->next = oc->proddables;
1660 oc->proddables = pb;
1663 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1666 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1667 char* s = (char*)(pb->start);
1668 char* e = s + pb->size - 1;
1669 char* a = (char*)addr;
1670 /* Assumes that the biggest fixup involves a 4-byte write. This
1671 probably needs to be changed to 8 (ie, +7) on 64-bit
1673 if (a >= s && (a+3) <= e) return;
1675 barf("checkProddableBlock: invalid fixup in runtime linker");
1678 /* -----------------------------------------------------------------------------
1679 * Section management.
1681 static void addSection ( ObjectCode* oc, SectionKind kind,
1682 void* start, void* end )
1684 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1688 s->next = oc->sections;
1691 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1692 start, ((char*)end)-1, end - start + 1, kind );
1697 /* --------------------------------------------------------------------------
1699 * This is about allocating a small chunk of memory for every symbol in the
1700 * object file. We make sure that the SymboLExtras are always "in range" of
1701 * limited-range PC-relative instructions on various platforms by allocating
1702 * them right next to the object code itself.
1705 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
1708 ocAllocateSymbolExtras
1710 Allocate additional space at the end of the object file image to make room
1711 for jump islands (powerpc, x86_64) and GOT entries (x86_64).
1713 PowerPC relative branch instructions have a 24 bit displacement field.
1714 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1715 If a particular imported symbol is outside this range, we have to redirect
1716 the jump to a short piece of new code that just loads the 32bit absolute
1717 address and jumps there.
1718 On x86_64, PC-relative jumps and PC-relative accesses to the GOT are limited
1721 This function just allocates space for one SymbolExtra for every
1722 undefined symbol in the object file. The code for the jump islands is
1723 filled in by makeSymbolExtra below.
1726 static int ocAllocateSymbolExtras( ObjectCode* oc, int count, int first )
1733 int misalignment = 0;
1734 #ifdef darwin_HOST_OS
1735 misalignment = oc->misalignment;
1741 // round up to the nearest 4
1742 aligned = (oc->fileSize + 3) & ~3;
1745 pagesize = getpagesize();
1746 n = ROUND_UP( oc->fileSize, pagesize );
1747 m = ROUND_UP( aligned + sizeof (SymbolExtra) * count, pagesize );
1749 /* we try to use spare space at the end of the last page of the
1750 * image for the jump islands, but if there isn't enough space
1751 * then we have to map some (anonymously, remembering MAP_32BIT).
1753 if( m > n ) // we need to allocate more pages
1755 oc->symbol_extras = mmapForLinker(sizeof(SymbolExtra) * count,
1760 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1763 oc->image -= misalignment;
1764 oc->image = stgReallocBytes( oc->image,
1766 aligned + sizeof (SymbolExtra) * count,
1767 "ocAllocateSymbolExtras" );
1768 oc->image += misalignment;
1770 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1771 #endif /* USE_MMAP */
1773 memset( oc->symbol_extras, 0, sizeof (SymbolExtra) * count );
1776 oc->symbol_extras = NULL;
1778 oc->first_symbol_extra = first;
1779 oc->n_symbol_extras = count;
1784 static SymbolExtra* makeSymbolExtra( ObjectCode* oc,
1785 unsigned long symbolNumber,
1786 unsigned long target )
1790 ASSERT( symbolNumber >= oc->first_symbol_extra
1791 && symbolNumber - oc->first_symbol_extra < oc->n_symbol_extras);
1793 extra = &oc->symbol_extras[symbolNumber - oc->first_symbol_extra];
1795 #ifdef powerpc_HOST_ARCH
1796 // lis r12, hi16(target)
1797 extra->jumpIsland.lis_r12 = 0x3d80;
1798 extra->jumpIsland.hi_addr = target >> 16;
1800 // ori r12, r12, lo16(target)
1801 extra->jumpIsland.ori_r12_r12 = 0x618c;
1802 extra->jumpIsland.lo_addr = target & 0xffff;
1805 extra->jumpIsland.mtctr_r12 = 0x7d8903a6;
1808 extra->jumpIsland.bctr = 0x4e800420;
1810 #ifdef x86_64_HOST_ARCH
1812 static uint8_t jmp[] = { 0xFF, 0x25, 0xF2, 0xFF, 0xFF, 0xFF };
1813 extra->addr = target;
1814 memcpy(extra->jumpIsland, jmp, 6);
1822 /* --------------------------------------------------------------------------
1823 * PowerPC specifics (instruction cache flushing)
1824 * ------------------------------------------------------------------------*/
1826 #ifdef powerpc_TARGET_ARCH
1828 ocFlushInstructionCache
1830 Flush the data & instruction caches.
1831 Because the PPC has split data/instruction caches, we have to
1832 do that whenever we modify code at runtime.
1835 static void ocFlushInstructionCache( ObjectCode *oc )
1837 int n = (oc->fileSize + sizeof( SymbolExtra ) * oc->n_symbol_extras + 3) / 4;
1838 unsigned long *p = (unsigned long *) oc->image;
1842 __asm__ volatile ( "dcbf 0,%0\n\t"
1850 __asm__ volatile ( "sync\n\t"
1856 /* --------------------------------------------------------------------------
1857 * PEi386 specifics (Win32 targets)
1858 * ------------------------------------------------------------------------*/
1860 /* The information for this linker comes from
1861 Microsoft Portable Executable
1862 and Common Object File Format Specification
1863 revision 5.1 January 1998
1864 which SimonM says comes from the MS Developer Network CDs.
1866 It can be found there (on older CDs), but can also be found
1869 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1871 (this is Rev 6.0 from February 1999).
1873 Things move, so if that fails, try searching for it via
1875 http://www.google.com/search?q=PE+COFF+specification
1877 The ultimate reference for the PE format is the Winnt.h
1878 header file that comes with the Platform SDKs; as always,
1879 implementations will drift wrt their documentation.
1881 A good background article on the PE format is Matt Pietrek's
1882 March 1994 article in Microsoft System Journal (MSJ)
1883 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1884 Win32 Portable Executable File Format." The info in there
1885 has recently been updated in a two part article in
1886 MSDN magazine, issues Feb and March 2002,
1887 "Inside Windows: An In-Depth Look into the Win32 Portable
1888 Executable File Format"
1890 John Levine's book "Linkers and Loaders" contains useful
1895 #if defined(OBJFORMAT_PEi386)
1899 typedef unsigned char UChar;
1900 typedef unsigned short UInt16;
1901 typedef unsigned int UInt32;
1908 UInt16 NumberOfSections;
1909 UInt32 TimeDateStamp;
1910 UInt32 PointerToSymbolTable;
1911 UInt32 NumberOfSymbols;
1912 UInt16 SizeOfOptionalHeader;
1913 UInt16 Characteristics;
1917 #define sizeof_COFF_header 20
1924 UInt32 VirtualAddress;
1925 UInt32 SizeOfRawData;
1926 UInt32 PointerToRawData;
1927 UInt32 PointerToRelocations;
1928 UInt32 PointerToLinenumbers;
1929 UInt16 NumberOfRelocations;
1930 UInt16 NumberOfLineNumbers;
1931 UInt32 Characteristics;
1935 #define sizeof_COFF_section 40
1942 UInt16 SectionNumber;
1945 UChar NumberOfAuxSymbols;
1949 #define sizeof_COFF_symbol 18
1954 UInt32 VirtualAddress;
1955 UInt32 SymbolTableIndex;
1960 #define sizeof_COFF_reloc 10
1963 /* From PE spec doc, section 3.3.2 */
1964 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1965 windows.h -- for the same purpose, but I want to know what I'm
1967 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1968 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1969 #define MYIMAGE_FILE_DLL 0x2000
1970 #define MYIMAGE_FILE_SYSTEM 0x1000
1971 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1972 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1973 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1975 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1976 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1977 #define MYIMAGE_SYM_CLASS_STATIC 3
1978 #define MYIMAGE_SYM_UNDEFINED 0
1980 /* From PE spec doc, section 4.1 */
1981 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1982 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1983 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1985 /* From PE spec doc, section 5.2.1 */
1986 #define MYIMAGE_REL_I386_DIR32 0x0006
1987 #define MYIMAGE_REL_I386_REL32 0x0014
1990 /* We use myindex to calculate array addresses, rather than
1991 simply doing the normal subscript thing. That's because
1992 some of the above structs have sizes which are not
1993 a whole number of words. GCC rounds their sizes up to a
1994 whole number of words, which means that the address calcs
1995 arising from using normal C indexing or pointer arithmetic
1996 are just plain wrong. Sigh.
1999 myindex ( int scale, void* base, int index )
2002 ((UChar*)base) + scale * index;
2007 printName ( UChar* name, UChar* strtab )
2009 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2010 UInt32 strtab_offset = * (UInt32*)(name+4);
2011 debugBelch("%s", strtab + strtab_offset );
2014 for (i = 0; i < 8; i++) {
2015 if (name[i] == 0) break;
2016 debugBelch("%c", name[i] );
2023 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
2025 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2026 UInt32 strtab_offset = * (UInt32*)(name+4);
2027 strncpy ( dst, strtab+strtab_offset, dstSize );
2033 if (name[i] == 0) break;
2043 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
2046 /* If the string is longer than 8 bytes, look in the
2047 string table for it -- this will be correctly zero terminated.
2049 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2050 UInt32 strtab_offset = * (UInt32*)(name+4);
2051 return ((UChar*)strtab) + strtab_offset;
2053 /* Otherwise, if shorter than 8 bytes, return the original,
2054 which by defn is correctly terminated.
2056 if (name[7]==0) return name;
2057 /* The annoying case: 8 bytes. Copy into a temporary
2058 (which is never freed ...)
2060 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
2062 strncpy(newstr,name,8);
2068 /* Just compares the short names (first 8 chars) */
2069 static COFF_section *
2070 findPEi386SectionCalled ( ObjectCode* oc, char* name )
2074 = (COFF_header*)(oc->image);
2075 COFF_section* sectab
2077 ((UChar*)(oc->image))
2078 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2080 for (i = 0; i < hdr->NumberOfSections; i++) {
2083 COFF_section* section_i
2085 myindex ( sizeof_COFF_section, sectab, i );
2086 n1 = (UChar*) &(section_i->Name);
2088 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
2089 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
2090 n1[6]==n2[6] && n1[7]==n2[7])
2099 zapTrailingAtSign ( UChar* sym )
2101 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
2103 if (sym[0] == 0) return;
2105 while (sym[i] != 0) i++;
2108 while (j > 0 && my_isdigit(sym[j])) j--;
2109 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
2114 lookupSymbolInDLLs ( UChar *lbl )
2119 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
2120 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
2122 if (lbl[0] == '_') {
2123 /* HACK: if the name has an initial underscore, try stripping
2124 it off & look that up first. I've yet to verify whether there's
2125 a Rule that governs whether an initial '_' *should always* be
2126 stripped off when mapping from import lib name to the DLL name.
2128 sym = GetProcAddress(o_dll->instance, (lbl+1));
2130 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
2134 sym = GetProcAddress(o_dll->instance, lbl);
2136 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
2145 ocVerifyImage_PEi386 ( ObjectCode* oc )
2150 COFF_section* sectab;
2151 COFF_symbol* symtab;
2153 /* debugBelch("\nLOADING %s\n", oc->fileName); */
2154 hdr = (COFF_header*)(oc->image);
2155 sectab = (COFF_section*) (
2156 ((UChar*)(oc->image))
2157 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2159 symtab = (COFF_symbol*) (
2160 ((UChar*)(oc->image))
2161 + hdr->PointerToSymbolTable
2163 strtab = ((UChar*)symtab)
2164 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2166 if (hdr->Machine != 0x14c) {
2167 errorBelch("%s: Not x86 PEi386", oc->fileName);
2170 if (hdr->SizeOfOptionalHeader != 0) {
2171 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2174 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2175 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2176 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2177 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2178 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2181 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2182 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2183 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2185 (int)(hdr->Characteristics));
2188 /* If the string table size is way crazy, this might indicate that
2189 there are more than 64k relocations, despite claims to the
2190 contrary. Hence this test. */
2191 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2193 if ( (*(UInt32*)strtab) > 600000 ) {
2194 /* Note that 600k has no special significance other than being
2195 big enough to handle the almost-2MB-sized lumps that
2196 constitute HSwin32*.o. */
2197 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2202 /* No further verification after this point; only debug printing. */
2204 IF_DEBUG(linker, i=1);
2205 if (i == 0) return 1;
2207 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2208 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2209 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2212 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2213 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2214 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2215 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2216 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2217 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2218 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2220 /* Print the section table. */
2222 for (i = 0; i < hdr->NumberOfSections; i++) {
2224 COFF_section* sectab_i
2226 myindex ( sizeof_COFF_section, sectab, i );
2233 printName ( sectab_i->Name, strtab );
2243 sectab_i->VirtualSize,
2244 sectab_i->VirtualAddress,
2245 sectab_i->SizeOfRawData,
2246 sectab_i->PointerToRawData,
2247 sectab_i->NumberOfRelocations,
2248 sectab_i->PointerToRelocations,
2249 sectab_i->PointerToRawData
2251 reltab = (COFF_reloc*) (
2252 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2255 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2256 /* If the relocation field (a short) has overflowed, the
2257 * real count can be found in the first reloc entry.
2259 * See Section 4.1 (last para) of the PE spec (rev6.0).
2261 COFF_reloc* rel = (COFF_reloc*)
2262 myindex ( sizeof_COFF_reloc, reltab, 0 );
2263 noRelocs = rel->VirtualAddress;
2266 noRelocs = sectab_i->NumberOfRelocations;
2270 for (; j < noRelocs; j++) {
2272 COFF_reloc* rel = (COFF_reloc*)
2273 myindex ( sizeof_COFF_reloc, reltab, j );
2275 " type 0x%-4x vaddr 0x%-8x name `",
2277 rel->VirtualAddress );
2278 sym = (COFF_symbol*)
2279 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2280 /* Hmm..mysterious looking offset - what's it for? SOF */
2281 printName ( sym->Name, strtab -10 );
2288 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2289 debugBelch("---START of string table---\n");
2290 for (i = 4; i < *(Int32*)strtab; i++) {
2292 debugBelch("\n"); else
2293 debugBelch("%c", strtab[i] );
2295 debugBelch("--- END of string table---\n");
2300 COFF_symbol* symtab_i;
2301 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2302 symtab_i = (COFF_symbol*)
2303 myindex ( sizeof_COFF_symbol, symtab, i );
2309 printName ( symtab_i->Name, strtab );
2318 (Int32)(symtab_i->SectionNumber),
2319 (UInt32)symtab_i->Type,
2320 (UInt32)symtab_i->StorageClass,
2321 (UInt32)symtab_i->NumberOfAuxSymbols
2323 i += symtab_i->NumberOfAuxSymbols;
2333 ocGetNames_PEi386 ( ObjectCode* oc )
2336 COFF_section* sectab;
2337 COFF_symbol* symtab;
2344 hdr = (COFF_header*)(oc->image);
2345 sectab = (COFF_section*) (
2346 ((UChar*)(oc->image))
2347 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2349 symtab = (COFF_symbol*) (
2350 ((UChar*)(oc->image))
2351 + hdr->PointerToSymbolTable
2353 strtab = ((UChar*)(oc->image))
2354 + hdr->PointerToSymbolTable
2355 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2357 /* Allocate space for any (local, anonymous) .bss sections. */
2359 for (i = 0; i < hdr->NumberOfSections; i++) {
2362 COFF_section* sectab_i
2364 myindex ( sizeof_COFF_section, sectab, i );
2365 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2366 /* sof 10/05: the PE spec text isn't too clear regarding what
2367 * the SizeOfRawData field is supposed to hold for object
2368 * file sections containing just uninitialized data -- for executables,
2369 * it is supposed to be zero; unclear what it's supposed to be
2370 * for object files. However, VirtualSize is guaranteed to be
2371 * zero for object files, which definitely suggests that SizeOfRawData
2372 * will be non-zero (where else would the size of this .bss section be
2373 * stored?) Looking at the COFF_section info for incoming object files,
2374 * this certainly appears to be the case.
2376 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2377 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2378 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2379 * variable decls into to the .bss section. (The specific function in Q which
2380 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2382 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2383 /* This is a non-empty .bss section. Allocate zeroed space for
2384 it, and set its PointerToRawData field such that oc->image +
2385 PointerToRawData == addr_of_zeroed_space. */
2386 bss_sz = sectab_i->VirtualSize;
2387 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2388 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2389 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2390 addProddableBlock(oc, zspace, bss_sz);
2391 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2394 /* Copy section information into the ObjectCode. */
2396 for (i = 0; i < hdr->NumberOfSections; i++) {
2402 = SECTIONKIND_OTHER;
2403 COFF_section* sectab_i
2405 myindex ( sizeof_COFF_section, sectab, i );
2406 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2409 /* I'm sure this is the Right Way to do it. However, the
2410 alternative of testing the sectab_i->Name field seems to
2411 work ok with Cygwin.
2413 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2414 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2415 kind = SECTIONKIND_CODE_OR_RODATA;
2418 if (0==strcmp(".text",sectab_i->Name) ||
2419 0==strcmp(".rdata",sectab_i->Name)||
2420 0==strcmp(".rodata",sectab_i->Name))
2421 kind = SECTIONKIND_CODE_OR_RODATA;
2422 if (0==strcmp(".data",sectab_i->Name) ||
2423 0==strcmp(".bss",sectab_i->Name))
2424 kind = SECTIONKIND_RWDATA;
2426 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2427 sz = sectab_i->SizeOfRawData;
2428 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2430 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2431 end = start + sz - 1;
2433 if (kind == SECTIONKIND_OTHER
2434 /* Ignore sections called which contain stabs debugging
2436 && 0 != strcmp(".stab", sectab_i->Name)
2437 && 0 != strcmp(".stabstr", sectab_i->Name)
2438 /* ignore constructor section for now */
2439 && 0 != strcmp(".ctors", sectab_i->Name)
2440 /* ignore section generated from .ident */
2441 && 0!= strcmp("/4", sectab_i->Name)
2442 /* ignore unknown section that appeared in gcc 3.4.5(?) */
2443 && 0!= strcmp(".reloc", sectab_i->Name)
2445 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2449 if (kind != SECTIONKIND_OTHER && end >= start) {
2450 addSection(oc, kind, start, end);
2451 addProddableBlock(oc, start, end - start + 1);
2455 /* Copy exported symbols into the ObjectCode. */
2457 oc->n_symbols = hdr->NumberOfSymbols;
2458 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2459 "ocGetNames_PEi386(oc->symbols)");
2460 /* Call me paranoid; I don't care. */
2461 for (i = 0; i < oc->n_symbols; i++)
2462 oc->symbols[i] = NULL;
2466 COFF_symbol* symtab_i;
2467 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2468 symtab_i = (COFF_symbol*)
2469 myindex ( sizeof_COFF_symbol, symtab, i );
2473 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2474 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2475 /* This symbol is global and defined, viz, exported */
2476 /* for MYIMAGE_SYMCLASS_EXTERNAL
2477 && !MYIMAGE_SYM_UNDEFINED,
2478 the address of the symbol is:
2479 address of relevant section + offset in section
2481 COFF_section* sectabent
2482 = (COFF_section*) myindex ( sizeof_COFF_section,
2484 symtab_i->SectionNumber-1 );
2485 addr = ((UChar*)(oc->image))
2486 + (sectabent->PointerToRawData
2490 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2491 && symtab_i->Value > 0) {
2492 /* This symbol isn't in any section at all, ie, global bss.
2493 Allocate zeroed space for it. */
2494 addr = stgCallocBytes(1, symtab_i->Value,
2495 "ocGetNames_PEi386(non-anonymous bss)");
2496 addSection(oc, SECTIONKIND_RWDATA, addr,
2497 ((UChar*)addr) + symtab_i->Value - 1);
2498 addProddableBlock(oc, addr, symtab_i->Value);
2499 /* debugBelch("BSS section at 0x%x\n", addr); */
2502 if (addr != NULL ) {
2503 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2504 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2505 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2506 ASSERT(i >= 0 && i < oc->n_symbols);
2507 /* cstring_from_COFF_symbol_name always succeeds. */
2508 oc->symbols[i] = sname;
2509 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2513 "IGNORING symbol %d\n"
2517 printName ( symtab_i->Name, strtab );
2526 (Int32)(symtab_i->SectionNumber),
2527 (UInt32)symtab_i->Type,
2528 (UInt32)symtab_i->StorageClass,
2529 (UInt32)symtab_i->NumberOfAuxSymbols
2534 i += symtab_i->NumberOfAuxSymbols;
2543 ocResolve_PEi386 ( ObjectCode* oc )
2546 COFF_section* sectab;
2547 COFF_symbol* symtab;
2557 /* ToDo: should be variable-sized? But is at least safe in the
2558 sense of buffer-overrun-proof. */
2560 /* debugBelch("resolving for %s\n", oc->fileName); */
2562 hdr = (COFF_header*)(oc->image);
2563 sectab = (COFF_section*) (
2564 ((UChar*)(oc->image))
2565 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2567 symtab = (COFF_symbol*) (
2568 ((UChar*)(oc->image))
2569 + hdr->PointerToSymbolTable
2571 strtab = ((UChar*)(oc->image))
2572 + hdr->PointerToSymbolTable
2573 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2575 for (i = 0; i < hdr->NumberOfSections; i++) {
2576 COFF_section* sectab_i
2578 myindex ( sizeof_COFF_section, sectab, i );
2581 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2584 /* Ignore sections called which contain stabs debugging
2586 if (0 == strcmp(".stab", sectab_i->Name)
2587 || 0 == strcmp(".stabstr", sectab_i->Name)
2588 || 0 == strcmp(".ctors", sectab_i->Name))
2591 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2592 /* If the relocation field (a short) has overflowed, the
2593 * real count can be found in the first reloc entry.
2595 * See Section 4.1 (last para) of the PE spec (rev6.0).
2597 * Nov2003 update: the GNU linker still doesn't correctly
2598 * handle the generation of relocatable object files with
2599 * overflown relocations. Hence the output to warn of potential
2602 COFF_reloc* rel = (COFF_reloc*)
2603 myindex ( sizeof_COFF_reloc, reltab, 0 );
2604 noRelocs = rel->VirtualAddress;
2606 /* 10/05: we now assume (and check for) a GNU ld that is capable
2607 * of handling object files with (>2^16) of relocs.
2610 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2615 noRelocs = sectab_i->NumberOfRelocations;
2620 for (; j < noRelocs; j++) {
2622 COFF_reloc* reltab_j
2624 myindex ( sizeof_COFF_reloc, reltab, j );
2626 /* the location to patch */
2628 ((UChar*)(oc->image))
2629 + (sectab_i->PointerToRawData
2630 + reltab_j->VirtualAddress
2631 - sectab_i->VirtualAddress )
2633 /* the existing contents of pP */
2635 /* the symbol to connect to */
2636 sym = (COFF_symbol*)
2637 myindex ( sizeof_COFF_symbol,
2638 symtab, reltab_j->SymbolTableIndex );
2641 "reloc sec %2d num %3d: type 0x%-4x "
2642 "vaddr 0x%-8x name `",
2644 (UInt32)reltab_j->Type,
2645 reltab_j->VirtualAddress );
2646 printName ( sym->Name, strtab );
2647 debugBelch("'\n" ));
2649 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2650 COFF_section* section_sym
2651 = findPEi386SectionCalled ( oc, sym->Name );
2653 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2656 S = ((UInt32)(oc->image))
2657 + (section_sym->PointerToRawData
2660 copyName ( sym->Name, strtab, symbol, 1000-1 );
2661 S = (UInt32) lookupSymbol( symbol );
2662 if ((void*)S != NULL) goto foundit;
2663 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
2667 checkProddableBlock(oc, pP);
2668 switch (reltab_j->Type) {
2669 case MYIMAGE_REL_I386_DIR32:
2672 case MYIMAGE_REL_I386_REL32:
2673 /* Tricky. We have to insert a displacement at
2674 pP which, when added to the PC for the _next_
2675 insn, gives the address of the target (S).
2676 Problem is to know the address of the next insn
2677 when we only know pP. We assume that this
2678 literal field is always the last in the insn,
2679 so that the address of the next insn is pP+4
2680 -- hence the constant 4.
2681 Also I don't know if A should be added, but so
2682 far it has always been zero.
2684 SOF 05/2005: 'A' (old contents of *pP) have been observed
2685 to contain values other than zero (the 'wx' object file
2686 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2687 So, add displacement to old value instead of asserting
2688 A to be zero. Fixes wxhaskell-related crashes, and no other
2689 ill effects have been observed.
2691 Update: the reason why we're seeing these more elaborate
2692 relocations is due to a switch in how the NCG compiles SRTs
2693 and offsets to them from info tables. SRTs live in .(ro)data,
2694 while info tables live in .text, causing GAS to emit REL32/DISP32
2695 relocations with non-zero values. Adding the displacement is
2696 the right thing to do.
2698 *pP = S - ((UInt32)pP) - 4 + A;
2701 debugBelch("%s: unhandled PEi386 relocation type %d",
2702 oc->fileName, reltab_j->Type);
2709 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2713 #endif /* defined(OBJFORMAT_PEi386) */
2716 /* --------------------------------------------------------------------------
2718 * ------------------------------------------------------------------------*/
2720 #if defined(OBJFORMAT_ELF)
2725 #if defined(sparc_HOST_ARCH)
2726 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2727 #elif defined(i386_HOST_ARCH)
2728 # define ELF_TARGET_386 /* Used inside <elf.h> */
2729 #elif defined(x86_64_HOST_ARCH)
2730 # define ELF_TARGET_X64_64
2732 #elif defined (ia64_HOST_ARCH)
2733 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2735 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2736 # define ELF_NEED_GOT /* needs Global Offset Table */
2737 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2740 #if !defined(openbsd_HOST_OS)
2743 /* openbsd elf has things in different places, with diff names */
2744 # include <elf_abi.h>
2745 # include <machine/reloc.h>
2746 # define R_386_32 RELOC_32
2747 # define R_386_PC32 RELOC_PC32
2750 /* If elf.h doesn't define it */
2751 # ifndef R_X86_64_PC64
2752 # define R_X86_64_PC64 24
2756 * Define a set of types which can be used for both ELF32 and ELF64
2760 #define ELFCLASS ELFCLASS64
2761 #define Elf_Addr Elf64_Addr
2762 #define Elf_Word Elf64_Word
2763 #define Elf_Sword Elf64_Sword
2764 #define Elf_Ehdr Elf64_Ehdr
2765 #define Elf_Phdr Elf64_Phdr
2766 #define Elf_Shdr Elf64_Shdr
2767 #define Elf_Sym Elf64_Sym
2768 #define Elf_Rel Elf64_Rel
2769 #define Elf_Rela Elf64_Rela
2770 #define ELF_ST_TYPE ELF64_ST_TYPE
2771 #define ELF_ST_BIND ELF64_ST_BIND
2772 #define ELF_R_TYPE ELF64_R_TYPE
2773 #define ELF_R_SYM ELF64_R_SYM
2775 #define ELFCLASS ELFCLASS32
2776 #define Elf_Addr Elf32_Addr
2777 #define Elf_Word Elf32_Word
2778 #define Elf_Sword Elf32_Sword
2779 #define Elf_Ehdr Elf32_Ehdr
2780 #define Elf_Phdr Elf32_Phdr
2781 #define Elf_Shdr Elf32_Shdr
2782 #define Elf_Sym Elf32_Sym
2783 #define Elf_Rel Elf32_Rel
2784 #define Elf_Rela Elf32_Rela
2786 #define ELF_ST_TYPE ELF32_ST_TYPE
2789 #define ELF_ST_BIND ELF32_ST_BIND
2792 #define ELF_R_TYPE ELF32_R_TYPE
2795 #define ELF_R_SYM ELF32_R_SYM
2801 * Functions to allocate entries in dynamic sections. Currently we simply
2802 * preallocate a large number, and we don't check if a entry for the given
2803 * target already exists (a linear search is too slow). Ideally these
2804 * entries would be associated with symbols.
2807 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2808 #define GOT_SIZE 0x20000
2809 #define FUNCTION_TABLE_SIZE 0x10000
2810 #define PLT_SIZE 0x08000
2813 static Elf_Addr got[GOT_SIZE];
2814 static unsigned int gotIndex;
2815 static Elf_Addr gp_val = (Elf_Addr)got;
2818 allocateGOTEntry(Elf_Addr target)
2822 if (gotIndex >= GOT_SIZE)
2823 barf("Global offset table overflow");
2825 entry = &got[gotIndex++];
2827 return (Elf_Addr)entry;
2831 #ifdef ELF_FUNCTION_DESC
2837 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2838 static unsigned int functionTableIndex;
2841 allocateFunctionDesc(Elf_Addr target)
2843 FunctionDesc *entry;
2845 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2846 barf("Function table overflow");
2848 entry = &functionTable[functionTableIndex++];
2850 entry->gp = (Elf_Addr)gp_val;
2851 return (Elf_Addr)entry;
2855 copyFunctionDesc(Elf_Addr target)
2857 FunctionDesc *olddesc = (FunctionDesc *)target;
2858 FunctionDesc *newdesc;
2860 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2861 newdesc->gp = olddesc->gp;
2862 return (Elf_Addr)newdesc;
2867 #ifdef ia64_HOST_ARCH
2868 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2869 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2871 static unsigned char plt_code[] =
2873 /* taken from binutils bfd/elfxx-ia64.c */
2874 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2875 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2876 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2877 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2878 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2879 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2882 /* If we can't get to the function descriptor via gp, take a local copy of it */
2883 #define PLT_RELOC(code, target) { \
2884 Elf64_Sxword rel_value = target - gp_val; \
2885 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2886 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2888 ia64_reloc_gprel22((Elf_Addr)code, target); \
2893 unsigned char code[sizeof(plt_code)];
2897 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2899 PLTEntry *plt = (PLTEntry *)oc->plt;
2902 if (oc->pltIndex >= PLT_SIZE)
2903 barf("Procedure table overflow");
2905 entry = &plt[oc->pltIndex++];
2906 memcpy(entry->code, plt_code, sizeof(entry->code));
2907 PLT_RELOC(entry->code, target);
2908 return (Elf_Addr)entry;
2914 return (PLT_SIZE * sizeof(PLTEntry));
2920 * Generic ELF functions
2924 findElfSection ( void* objImage, Elf_Word sh_type )
2926 char* ehdrC = (char*)objImage;
2927 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2928 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2929 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2933 for (i = 0; i < ehdr->e_shnum; i++) {
2934 if (shdr[i].sh_type == sh_type
2935 /* Ignore the section header's string table. */
2936 && i != ehdr->e_shstrndx
2937 /* Ignore string tables named .stabstr, as they contain
2939 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2941 ptr = ehdrC + shdr[i].sh_offset;
2948 #if defined(ia64_HOST_ARCH)
2950 findElfSegment ( void* objImage, Elf_Addr vaddr )
2952 char* ehdrC = (char*)objImage;
2953 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2954 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2955 Elf_Addr segaddr = 0;
2958 for (i = 0; i < ehdr->e_phnum; i++) {
2959 segaddr = phdr[i].p_vaddr;
2960 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2968 ocVerifyImage_ELF ( ObjectCode* oc )
2972 int i, j, nent, nstrtab, nsymtabs;
2976 char* ehdrC = (char*)(oc->image);
2977 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2979 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2980 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2981 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2982 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2983 errorBelch("%s: not an ELF object", oc->fileName);
2987 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2988 errorBelch("%s: unsupported ELF format", oc->fileName);
2992 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2993 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2995 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2996 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2998 errorBelch("%s: unknown endiannness", oc->fileName);
3002 if (ehdr->e_type != ET_REL) {
3003 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
3006 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
3008 IF_DEBUG(linker,debugBelch( "Architecture is " ));
3009 switch (ehdr->e_machine) {
3010 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
3011 #ifdef EM_SPARC32PLUS
3012 case EM_SPARC32PLUS:
3014 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
3016 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
3018 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
3020 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
3021 #elif defined(EM_AMD64)
3022 case EM_AMD64: IF_DEBUG(linker,debugBelch( "amd64" )); break;
3024 default: IF_DEBUG(linker,debugBelch( "unknown" ));
3025 errorBelch("%s: unknown architecture (e_machine == %d)"
3026 , oc->fileName, ehdr->e_machine);
3030 IF_DEBUG(linker,debugBelch(
3031 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
3032 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
3034 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
3036 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3038 if (ehdr->e_shstrndx == SHN_UNDEF) {
3039 errorBelch("%s: no section header string table", oc->fileName);
3042 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
3044 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
3047 for (i = 0; i < ehdr->e_shnum; i++) {
3048 IF_DEBUG(linker,debugBelch("%2d: ", i ));
3049 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
3050 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
3051 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
3052 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
3053 ehdrC + shdr[i].sh_offset,
3054 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
3056 if (shdr[i].sh_type == SHT_REL) {
3057 IF_DEBUG(linker,debugBelch("Rel " ));
3058 } else if (shdr[i].sh_type == SHT_RELA) {
3059 IF_DEBUG(linker,debugBelch("RelA " ));
3061 IF_DEBUG(linker,debugBelch(" "));
3064 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
3068 IF_DEBUG(linker,debugBelch( "\nString tables" ));
3071 for (i = 0; i < ehdr->e_shnum; i++) {
3072 if (shdr[i].sh_type == SHT_STRTAB
3073 /* Ignore the section header's string table. */
3074 && i != ehdr->e_shstrndx
3075 /* Ignore string tables named .stabstr, as they contain
3077 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
3079 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
3080 strtab = ehdrC + shdr[i].sh_offset;
3085 errorBelch("%s: no string tables, or too many", oc->fileName);
3090 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
3091 for (i = 0; i < ehdr->e_shnum; i++) {
3092 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3093 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
3095 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3096 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3097 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
3099 (long)shdr[i].sh_size % sizeof(Elf_Sym)
3101 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
3102 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
3105 for (j = 0; j < nent; j++) {
3106 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3107 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3108 (int)stab[j].st_shndx,
3109 (int)stab[j].st_size,
3110 (char*)stab[j].st_value ));
3112 IF_DEBUG(linker,debugBelch("type=" ));
3113 switch (ELF_ST_TYPE(stab[j].st_info)) {
3114 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3115 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3116 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3117 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3118 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3119 default: IF_DEBUG(linker,debugBelch("? " )); break;
3121 IF_DEBUG(linker,debugBelch(" " ));
3123 IF_DEBUG(linker,debugBelch("bind=" ));
3124 switch (ELF_ST_BIND(stab[j].st_info)) {
3125 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3126 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3127 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3128 default: IF_DEBUG(linker,debugBelch("? " )); break;
3130 IF_DEBUG(linker,debugBelch(" " ));
3132 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3136 if (nsymtabs == 0) {
3137 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3144 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3148 if (hdr->sh_type == SHT_PROGBITS
3149 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3150 /* .text-style section */
3151 return SECTIONKIND_CODE_OR_RODATA;
3154 if (hdr->sh_type == SHT_PROGBITS
3155 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3156 /* .data-style section */
3157 return SECTIONKIND_RWDATA;
3160 if (hdr->sh_type == SHT_PROGBITS
3161 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3162 /* .rodata-style section */
3163 return SECTIONKIND_CODE_OR_RODATA;
3166 if (hdr->sh_type == SHT_NOBITS
3167 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3168 /* .bss-style section */
3170 return SECTIONKIND_RWDATA;
3173 return SECTIONKIND_OTHER;
3178 ocGetNames_ELF ( ObjectCode* oc )
3183 char* ehdrC = (char*)(oc->image);
3184 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3185 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3186 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3188 ASSERT(symhash != NULL);
3191 errorBelch("%s: no strtab", oc->fileName);
3196 for (i = 0; i < ehdr->e_shnum; i++) {
3197 /* Figure out what kind of section it is. Logic derived from
3198 Figure 1.14 ("Special Sections") of the ELF document
3199 ("Portable Formats Specification, Version 1.1"). */
3201 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3203 if (is_bss && shdr[i].sh_size > 0) {
3204 /* This is a non-empty .bss section. Allocate zeroed space for
3205 it, and set its .sh_offset field such that
3206 ehdrC + .sh_offset == addr_of_zeroed_space. */
3207 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3208 "ocGetNames_ELF(BSS)");
3209 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3211 debugBelch("BSS section at 0x%x, size %d\n",
3212 zspace, shdr[i].sh_size);
3216 /* fill in the section info */
3217 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3218 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3219 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3220 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3223 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3225 /* copy stuff into this module's object symbol table */
3226 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3227 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3229 oc->n_symbols = nent;
3230 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3231 "ocGetNames_ELF(oc->symbols)");
3233 for (j = 0; j < nent; j++) {
3235 char isLocal = FALSE; /* avoids uninit-var warning */
3237 char* nm = strtab + stab[j].st_name;
3238 int secno = stab[j].st_shndx;
3240 /* Figure out if we want to add it; if so, set ad to its
3241 address. Otherwise leave ad == NULL. */
3243 if (secno == SHN_COMMON) {
3245 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3247 debugBelch("COMMON symbol, size %d name %s\n",
3248 stab[j].st_size, nm);
3250 /* Pointless to do addProddableBlock() for this area,
3251 since the linker should never poke around in it. */
3254 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3255 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3257 /* and not an undefined symbol */
3258 && stab[j].st_shndx != SHN_UNDEF
3259 /* and not in a "special section" */
3260 && stab[j].st_shndx < SHN_LORESERVE
3262 /* and it's a not a section or string table or anything silly */
3263 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3264 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3265 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3268 /* Section 0 is the undefined section, hence > and not >=. */
3269 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3271 if (shdr[secno].sh_type == SHT_NOBITS) {
3272 debugBelch(" BSS symbol, size %d off %d name %s\n",
3273 stab[j].st_size, stab[j].st_value, nm);
3276 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3277 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3280 #ifdef ELF_FUNCTION_DESC
3281 /* dlsym() and the initialisation table both give us function
3282 * descriptors, so to be consistent we store function descriptors
3283 * in the symbol table */
3284 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3285 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3287 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s\n",
3288 ad, oc->fileName, nm ));
3293 /* And the decision is ... */
3297 oc->symbols[j] = nm;
3300 /* Ignore entirely. */
3302 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3306 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3307 strtab + stab[j].st_name ));
3310 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3311 (int)ELF_ST_BIND(stab[j].st_info),
3312 (int)ELF_ST_TYPE(stab[j].st_info),
3313 (int)stab[j].st_shndx,
3314 strtab + stab[j].st_name
3317 oc->symbols[j] = NULL;
3326 /* Do ELF relocations which lack an explicit addend. All x86-linux
3327 relocations appear to be of this form. */
3329 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3330 Elf_Shdr* shdr, int shnum,
3331 Elf_Sym* stab, char* strtab )
3336 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3337 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3338 int target_shndx = shdr[shnum].sh_info;
3339 int symtab_shndx = shdr[shnum].sh_link;
3341 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3342 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3343 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3344 target_shndx, symtab_shndx ));
3346 /* Skip sections that we're not interested in. */
3349 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3350 if (kind == SECTIONKIND_OTHER) {
3351 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3356 for (j = 0; j < nent; j++) {
3357 Elf_Addr offset = rtab[j].r_offset;
3358 Elf_Addr info = rtab[j].r_info;
3360 Elf_Addr P = ((Elf_Addr)targ) + offset;
3361 Elf_Word* pP = (Elf_Word*)P;
3366 StgStablePtr stablePtr;
3369 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3370 j, (void*)offset, (void*)info ));
3372 IF_DEBUG(linker,debugBelch( " ZERO" ));
3375 Elf_Sym sym = stab[ELF_R_SYM(info)];
3376 /* First see if it is a local symbol. */
3377 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3378 /* Yes, so we can get the address directly from the ELF symbol
3380 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3382 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3383 + stab[ELF_R_SYM(info)].st_value);
3386 symbol = strtab + sym.st_name;
3387 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3388 if (NULL == stablePtr) {
3389 /* No, so look up the name in our global table. */
3390 S_tmp = lookupSymbol( symbol );
3391 S = (Elf_Addr)S_tmp;
3393 stableVal = deRefStablePtr( stablePtr );
3395 S = (Elf_Addr)S_tmp;
3399 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3402 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3405 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3406 (void*)P, (void*)S, (void*)A ));
3407 checkProddableBlock ( oc, pP );
3411 switch (ELF_R_TYPE(info)) {
3412 # ifdef i386_HOST_ARCH
3413 case R_386_32: *pP = value; break;
3414 case R_386_PC32: *pP = value - P; break;
3417 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3418 oc->fileName, (lnat)ELF_R_TYPE(info));
3426 /* Do ELF relocations for which explicit addends are supplied.
3427 sparc-solaris relocations appear to be of this form. */
3429 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3430 Elf_Shdr* shdr, int shnum,
3431 Elf_Sym* stab, char* strtab )
3434 char *symbol = NULL;
3436 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3437 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3438 int target_shndx = shdr[shnum].sh_info;
3439 int symtab_shndx = shdr[shnum].sh_link;
3441 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3442 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3443 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3444 target_shndx, symtab_shndx ));
3446 for (j = 0; j < nent; j++) {
3447 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3448 /* This #ifdef only serves to avoid unused-var warnings. */
3449 Elf_Addr offset = rtab[j].r_offset;
3450 Elf_Addr P = targ + offset;
3452 Elf_Addr info = rtab[j].r_info;
3453 Elf_Addr A = rtab[j].r_addend;
3457 # if defined(sparc_HOST_ARCH)
3458 Elf_Word* pP = (Elf_Word*)P;
3460 # elif defined(ia64_HOST_ARCH)
3461 Elf64_Xword *pP = (Elf64_Xword *)P;
3463 # elif defined(powerpc_HOST_ARCH)
3467 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3468 j, (void*)offset, (void*)info,
3471 IF_DEBUG(linker,debugBelch( " ZERO" ));
3474 Elf_Sym sym = stab[ELF_R_SYM(info)];
3475 /* First see if it is a local symbol. */
3476 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3477 /* Yes, so we can get the address directly from the ELF symbol
3479 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3481 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3482 + stab[ELF_R_SYM(info)].st_value);
3483 #ifdef ELF_FUNCTION_DESC
3484 /* Make a function descriptor for this function */
3485 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3486 S = allocateFunctionDesc(S + A);
3491 /* No, so look up the name in our global table. */
3492 symbol = strtab + sym.st_name;
3493 S_tmp = lookupSymbol( symbol );
3494 S = (Elf_Addr)S_tmp;
3496 #ifdef ELF_FUNCTION_DESC
3497 /* If a function, already a function descriptor - we would
3498 have to copy it to add an offset. */
3499 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3500 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3504 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3507 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3510 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3511 (void*)P, (void*)S, (void*)A ));
3512 /* checkProddableBlock ( oc, (void*)P ); */
3516 switch (ELF_R_TYPE(info)) {
3517 # if defined(sparc_HOST_ARCH)
3518 case R_SPARC_WDISP30:
3519 w1 = *pP & 0xC0000000;
3520 w2 = (Elf_Word)((value - P) >> 2);
3521 ASSERT((w2 & 0xC0000000) == 0);
3526 w1 = *pP & 0xFFC00000;
3527 w2 = (Elf_Word)(value >> 10);
3528 ASSERT((w2 & 0xFFC00000) == 0);
3534 w2 = (Elf_Word)(value & 0x3FF);
3535 ASSERT((w2 & ~0x3FF) == 0);
3540 /* According to the Sun documentation:
3542 This relocation type resembles R_SPARC_32, except it refers to an
3543 unaligned word. That is, the word to be relocated must be treated
3544 as four separate bytes with arbitrary alignment, not as a word
3545 aligned according to the architecture requirements.
3548 w2 = (Elf_Word)value;
3550 // SPARC doesn't do misaligned writes of 32 bit words,
3551 // so we have to do this one byte-at-a-time.
3552 char *pPc = (char*)pP;
3553 pPc[0] = (char) ((Elf_Word)(w2 & 0xff000000) >> 24);
3554 pPc[1] = (char) ((Elf_Word)(w2 & 0x00ff0000) >> 16);
3555 pPc[2] = (char) ((Elf_Word)(w2 & 0x0000ff00) >> 8);
3556 pPc[3] = (char) ((Elf_Word)(w2 & 0x000000ff));
3560 w2 = (Elf_Word)value;
3563 # elif defined(ia64_HOST_ARCH)
3564 case R_IA64_DIR64LSB:
3565 case R_IA64_FPTR64LSB:
3568 case R_IA64_PCREL64LSB:
3571 case R_IA64_SEGREL64LSB:
3572 addr = findElfSegment(ehdrC, value);
3575 case R_IA64_GPREL22:
3576 ia64_reloc_gprel22(P, value);
3578 case R_IA64_LTOFF22:
3579 case R_IA64_LTOFF22X:
3580 case R_IA64_LTOFF_FPTR22:
3581 addr = allocateGOTEntry(value);
3582 ia64_reloc_gprel22(P, addr);
3584 case R_IA64_PCREL21B:
3585 ia64_reloc_pcrel21(P, S, oc);
3588 /* This goes with R_IA64_LTOFF22X and points to the load to
3589 * convert into a move. We don't implement relaxation. */
3591 # elif defined(powerpc_HOST_ARCH)
3592 case R_PPC_ADDR16_LO:
3593 *(Elf32_Half*) P = value;
3596 case R_PPC_ADDR16_HI:
3597 *(Elf32_Half*) P = value >> 16;
3600 case R_PPC_ADDR16_HA:
3601 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3605 *(Elf32_Word *) P = value;
3609 *(Elf32_Word *) P = value - P;
3615 if( delta << 6 >> 6 != delta )
3617 value = (Elf_Addr) (&makeSymbolExtra( oc, ELF_R_SYM(info), value )
3621 if( value == 0 || delta << 6 >> 6 != delta )
3623 barf( "Unable to make SymbolExtra for #%d",
3629 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3630 | (delta & 0x3fffffc);
3634 #if x86_64_HOST_ARCH
3636 *(Elf64_Xword *)P = value;
3641 StgInt64 off = value - P;
3642 if (off >= 0x7fffffffL || off < -0x80000000L) {
3643 #if X86_64_ELF_NONPIC_HACK
3644 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3646 off = pltAddress + A - P;
3648 barf("R_X86_64_PC32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3649 symbol, off, oc->fileName );
3652 *(Elf64_Word *)P = (Elf64_Word)off;
3658 StgInt64 off = value - P;
3659 *(Elf64_Word *)P = (Elf64_Word)off;
3664 if (value >= 0x7fffffffL) {
3665 #if X86_64_ELF_NONPIC_HACK
3666 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3668 value = pltAddress + A;
3670 barf("R_X86_64_32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3671 symbol, value, oc->fileName );
3674 *(Elf64_Word *)P = (Elf64_Word)value;
3678 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3679 #if X86_64_ELF_NONPIC_HACK
3680 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3682 value = pltAddress + A;
3684 barf("R_X86_64_32S relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3685 symbol, value, oc->fileName );
3688 *(Elf64_Sword *)P = (Elf64_Sword)value;
3691 case R_X86_64_GOTPCREL:
3693 StgInt64 gotAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)->addr;
3694 StgInt64 off = gotAddress + A - P;
3695 *(Elf64_Word *)P = (Elf64_Word)off;
3699 case R_X86_64_PLT32:
3701 StgInt64 off = value - P;
3702 if (off >= 0x7fffffffL || off < -0x80000000L) {
3703 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3705 off = pltAddress + A - P;
3707 *(Elf64_Word *)P = (Elf64_Word)off;
3713 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3714 oc->fileName, (lnat)ELF_R_TYPE(info));
3723 ocResolve_ELF ( ObjectCode* oc )
3727 Elf_Sym* stab = NULL;
3728 char* ehdrC = (char*)(oc->image);
3729 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3730 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3732 /* first find "the" symbol table */
3733 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3735 /* also go find the string table */
3736 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3738 if (stab == NULL || strtab == NULL) {
3739 errorBelch("%s: can't find string or symbol table", oc->fileName);
3743 /* Process the relocation sections. */
3744 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3745 if (shdr[shnum].sh_type == SHT_REL) {
3746 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3747 shnum, stab, strtab );
3751 if (shdr[shnum].sh_type == SHT_RELA) {
3752 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3753 shnum, stab, strtab );
3758 #if defined(powerpc_HOST_ARCH)
3759 ocFlushInstructionCache( oc );
3767 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3768 * at the front. The following utility functions pack and unpack instructions, and
3769 * take care of the most common relocations.
3772 #ifdef ia64_HOST_ARCH
3775 ia64_extract_instruction(Elf64_Xword *target)
3778 int slot = (Elf_Addr)target & 3;
3779 target = (Elf_Addr)target & ~3;
3787 return ((w1 >> 5) & 0x1ffffffffff);
3789 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3793 barf("ia64_extract_instruction: invalid slot %p", target);
3798 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3800 int slot = (Elf_Addr)target & 3;
3801 target = (Elf_Addr)target & ~3;
3806 *target |= value << 5;
3809 *target |= value << 46;
3810 *(target+1) |= value >> 18;
3813 *(target+1) |= value << 23;
3819 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3821 Elf64_Xword instruction;
3822 Elf64_Sxword rel_value;
3824 rel_value = value - gp_val;
3825 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3826 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3828 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3829 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3830 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3831 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3832 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3833 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3837 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3839 Elf64_Xword instruction;
3840 Elf64_Sxword rel_value;
3843 entry = allocatePLTEntry(value, oc);
3845 rel_value = (entry >> 4) - (target >> 4);
3846 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3847 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3849 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3850 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3851 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3852 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3858 * PowerPC & X86_64 ELF specifics
3861 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3863 static int ocAllocateSymbolExtras_ELF( ObjectCode *oc )
3869 ehdr = (Elf_Ehdr *) oc->image;
3870 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3872 for( i = 0; i < ehdr->e_shnum; i++ )
3873 if( shdr[i].sh_type == SHT_SYMTAB )
3876 if( i == ehdr->e_shnum )
3878 errorBelch( "This ELF file contains no symtab" );
3882 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3884 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3885 (int) shdr[i].sh_entsize, (int) sizeof( Elf_Sym ) );
3890 return ocAllocateSymbolExtras( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3893 #endif /* powerpc */
3897 /* --------------------------------------------------------------------------
3899 * ------------------------------------------------------------------------*/
3901 #if defined(OBJFORMAT_MACHO)
3904 Support for MachO linking on Darwin/MacOS X
3905 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3907 I hereby formally apologize for the hackish nature of this code.
3908 Things that need to be done:
3909 *) implement ocVerifyImage_MachO
3910 *) add still more sanity checks.
3913 #if x86_64_HOST_ARCH || powerpc64_HOST_ARCH
3914 #define mach_header mach_header_64
3915 #define segment_command segment_command_64
3916 #define section section_64
3917 #define nlist nlist_64
3920 #ifdef powerpc_HOST_ARCH
3921 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3923 struct mach_header *header = (struct mach_header *) oc->image;
3924 struct load_command *lc = (struct load_command *) (header + 1);
3927 for( i = 0; i < header->ncmds; i++ )
3929 if( lc->cmd == LC_SYMTAB )
3931 // Find out the first and last undefined external
3932 // symbol, so we don't have to allocate too many
3934 struct symtab_command *symLC = (struct symtab_command *) lc;
3935 unsigned min = symLC->nsyms, max = 0;
3936 struct nlist *nlist =
3937 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3939 for(i=0;i<symLC->nsyms;i++)
3941 if(nlist[i].n_type & N_STAB)
3943 else if(nlist[i].n_type & N_EXT)
3945 if((nlist[i].n_type & N_TYPE) == N_UNDF
3946 && (nlist[i].n_value == 0))
3956 return ocAllocateSymbolExtras(oc, max - min + 1, min);
3961 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3963 return ocAllocateSymbolExtras(oc,0,0);
3966 #ifdef x86_64_HOST_ARCH
3967 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3969 struct mach_header *header = (struct mach_header *) oc->image;
3970 struct load_command *lc = (struct load_command *) (header + 1);
3973 for( i = 0; i < header->ncmds; i++ )
3975 if( lc->cmd == LC_SYMTAB )
3977 // Just allocate one entry for every symbol
3978 struct symtab_command *symLC = (struct symtab_command *) lc;
3980 return ocAllocateSymbolExtras(oc, symLC->nsyms, 0);
3983 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3985 return ocAllocateSymbolExtras(oc,0,0);
3989 static int ocVerifyImage_MachO(ObjectCode* oc)
3991 char *image = (char*) oc->image;
3992 struct mach_header *header = (struct mach_header*) image;
3994 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
3995 if(header->magic != MH_MAGIC_64)
3998 if(header->magic != MH_MAGIC)
4001 // FIXME: do some more verifying here
4005 static int resolveImports(
4008 struct symtab_command *symLC,
4009 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
4010 unsigned long *indirectSyms,
4011 struct nlist *nlist)
4014 size_t itemSize = 4;
4017 int isJumpTable = 0;
4018 if(!strcmp(sect->sectname,"__jump_table"))
4022 ASSERT(sect->reserved2 == itemSize);
4026 for(i=0; i*itemSize < sect->size;i++)
4028 // according to otool, reserved1 contains the first index into the indirect symbol table
4029 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
4030 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4033 if((symbol->n_type & N_TYPE) == N_UNDF
4034 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
4035 addr = (void*) (symbol->n_value);
4037 addr = lookupSymbol(nm);
4040 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
4048 checkProddableBlock(oc,image + sect->offset + i*itemSize);
4049 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
4050 *(unsigned*)(image + sect->offset + i*itemSize + 1)
4051 = (char*)addr - (image + sect->offset + i*itemSize + 5);
4056 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
4057 ((void**)(image + sect->offset))[i] = addr;
4064 static unsigned long relocateAddress(
4067 struct section* sections,
4068 unsigned long address)
4071 for(i = 0; i < nSections; i++)
4073 if(sections[i].addr <= address
4074 && address < sections[i].addr + sections[i].size)
4076 return (unsigned long)oc->image
4077 + sections[i].offset + address - sections[i].addr;
4080 barf("Invalid Mach-O file:"
4081 "Address out of bounds while relocating object file");
4085 static int relocateSection(
4088 struct symtab_command *symLC, struct nlist *nlist,
4089 int nSections, struct section* sections, struct section *sect)
4091 struct relocation_info *relocs;
4094 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
4096 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
4098 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
4100 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
4104 relocs = (struct relocation_info*) (image + sect->reloff);
4108 #ifdef x86_64_HOST_ARCH
4109 struct relocation_info *reloc = &relocs[i];
4111 char *thingPtr = image + sect->offset + reloc->r_address;
4113 /* We shouldn't need to initialise this, but gcc on OS X 64 bit
4114 complains that it may be used uninitialized if we don't */
4117 int type = reloc->r_type;
4119 checkProddableBlock(oc,thingPtr);
4120 switch(reloc->r_length)
4123 thing = *(uint8_t*)thingPtr;
4124 baseValue = (uint64_t)thingPtr + 1;
4127 thing = *(uint16_t*)thingPtr;
4128 baseValue = (uint64_t)thingPtr + 2;
4131 thing = *(uint32_t*)thingPtr;
4132 baseValue = (uint64_t)thingPtr + 4;
4135 thing = *(uint64_t*)thingPtr;
4136 baseValue = (uint64_t)thingPtr + 8;
4139 barf("Unknown size.");
4142 if(type == X86_64_RELOC_GOT
4143 || type == X86_64_RELOC_GOT_LOAD)
4145 ASSERT(reloc->r_extern);
4146 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)->addr;
4148 type = X86_64_RELOC_SIGNED;
4150 else if(reloc->r_extern)
4152 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4153 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4154 if(symbol->n_value == 0)
4155 value = (uint64_t) lookupSymbol(nm);
4157 value = relocateAddress(oc, nSections, sections,
4162 value = sections[reloc->r_symbolnum-1].offset
4163 - sections[reloc->r_symbolnum-1].addr
4167 if(type == X86_64_RELOC_BRANCH)
4169 if((int32_t)(value - baseValue) != (int64_t)(value - baseValue))
4171 ASSERT(reloc->r_extern);
4172 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)
4175 ASSERT((int32_t)(value - baseValue) == (int64_t)(value - baseValue));
4176 type = X86_64_RELOC_SIGNED;
4181 case X86_64_RELOC_UNSIGNED:
4182 ASSERT(!reloc->r_pcrel);
4185 case X86_64_RELOC_SIGNED:
4186 ASSERT(reloc->r_pcrel);
4187 thing += value - baseValue;
4189 case X86_64_RELOC_SUBTRACTOR:
4190 ASSERT(!reloc->r_pcrel);
4194 barf("unkown relocation");
4197 switch(reloc->r_length)
4200 *(uint8_t*)thingPtr = thing;
4203 *(uint16_t*)thingPtr = thing;
4206 *(uint32_t*)thingPtr = thing;
4209 *(uint64_t*)thingPtr = thing;
4213 if(relocs[i].r_address & R_SCATTERED)
4215 struct scattered_relocation_info *scat =
4216 (struct scattered_relocation_info*) &relocs[i];
4220 if(scat->r_length == 2)
4222 unsigned long word = 0;
4223 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
4224 checkProddableBlock(oc,wordPtr);
4226 // Note on relocation types:
4227 // i386 uses the GENERIC_RELOC_* types,
4228 // while ppc uses special PPC_RELOC_* types.
4229 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
4230 // in both cases, all others are different.
4231 // Therefore, we use GENERIC_RELOC_VANILLA
4232 // and GENERIC_RELOC_PAIR instead of the PPC variants,
4233 // and use #ifdefs for the other types.
4235 // Step 1: Figure out what the relocated value should be
4236 if(scat->r_type == GENERIC_RELOC_VANILLA)
4238 word = *wordPtr + (unsigned long) relocateAddress(
4245 #ifdef powerpc_HOST_ARCH
4246 else if(scat->r_type == PPC_RELOC_SECTDIFF
4247 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
4248 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
4249 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
4251 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
4254 struct scattered_relocation_info *pair =
4255 (struct scattered_relocation_info*) &relocs[i+1];
4257 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
4258 barf("Invalid Mach-O file: "
4259 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
4261 word = (unsigned long)
4262 (relocateAddress(oc, nSections, sections, scat->r_value)
4263 - relocateAddress(oc, nSections, sections, pair->r_value));
4266 #ifdef powerpc_HOST_ARCH
4267 else if(scat->r_type == PPC_RELOC_HI16
4268 || scat->r_type == PPC_RELOC_LO16
4269 || scat->r_type == PPC_RELOC_HA16
4270 || scat->r_type == PPC_RELOC_LO14)
4271 { // these are generated by label+offset things
4272 struct relocation_info *pair = &relocs[i+1];
4273 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
4274 barf("Invalid Mach-O file: "
4275 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
4277 if(scat->r_type == PPC_RELOC_LO16)
4279 word = ((unsigned short*) wordPtr)[1];
4280 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4282 else if(scat->r_type == PPC_RELOC_LO14)
4284 barf("Unsupported Relocation: PPC_RELOC_LO14");
4285 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
4286 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4288 else if(scat->r_type == PPC_RELOC_HI16)
4290 word = ((unsigned short*) wordPtr)[1] << 16;
4291 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4293 else if(scat->r_type == PPC_RELOC_HA16)
4295 word = ((unsigned short*) wordPtr)[1] << 16;
4296 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4300 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4307 continue; // ignore the others
4309 #ifdef powerpc_HOST_ARCH
4310 if(scat->r_type == GENERIC_RELOC_VANILLA
4311 || scat->r_type == PPC_RELOC_SECTDIFF)
4313 if(scat->r_type == GENERIC_RELOC_VANILLA
4314 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4319 #ifdef powerpc_HOST_ARCH
4320 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4322 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4324 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4326 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4328 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4330 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4331 + ((word & (1<<15)) ? 1 : 0);
4337 continue; // FIXME: I hope it's OK to ignore all the others.
4341 struct relocation_info *reloc = &relocs[i];
4342 if(reloc->r_pcrel && !reloc->r_extern)
4345 if(reloc->r_length == 2)
4347 unsigned long word = 0;
4348 #ifdef powerpc_HOST_ARCH
4349 unsigned long jumpIsland = 0;
4350 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4351 // to avoid warning and to catch
4355 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4356 checkProddableBlock(oc,wordPtr);
4358 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4362 #ifdef powerpc_HOST_ARCH
4363 else if(reloc->r_type == PPC_RELOC_LO16)
4365 word = ((unsigned short*) wordPtr)[1];
4366 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4368 else if(reloc->r_type == PPC_RELOC_HI16)
4370 word = ((unsigned short*) wordPtr)[1] << 16;
4371 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4373 else if(reloc->r_type == PPC_RELOC_HA16)
4375 word = ((unsigned short*) wordPtr)[1] << 16;
4376 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4378 else if(reloc->r_type == PPC_RELOC_BR24)
4381 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4385 if(!reloc->r_extern)
4388 sections[reloc->r_symbolnum-1].offset
4389 - sections[reloc->r_symbolnum-1].addr
4396 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4397 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4398 void *symbolAddress = lookupSymbol(nm);
4401 errorBelch("\nunknown symbol `%s'", nm);
4407 #ifdef powerpc_HOST_ARCH
4408 // In the .o file, this should be a relative jump to NULL
4409 // and we'll change it to a relative jump to the symbol
4410 ASSERT(word + reloc->r_address == 0);
4411 jumpIsland = (unsigned long)
4412 &makeSymbolExtra(oc,
4414 (unsigned long) symbolAddress)
4418 offsetToJumpIsland = word + jumpIsland
4419 - (((long)image) + sect->offset - sect->addr);
4422 word += (unsigned long) symbolAddress
4423 - (((long)image) + sect->offset - sect->addr);
4427 word += (unsigned long) symbolAddress;
4431 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4436 #ifdef powerpc_HOST_ARCH
4437 else if(reloc->r_type == PPC_RELOC_LO16)
4439 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4442 else if(reloc->r_type == PPC_RELOC_HI16)
4444 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4447 else if(reloc->r_type == PPC_RELOC_HA16)
4449 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4450 + ((word & (1<<15)) ? 1 : 0);
4453 else if(reloc->r_type == PPC_RELOC_BR24)
4455 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4457 // The branch offset is too large.
4458 // Therefore, we try to use a jump island.
4461 barf("unconditional relative branch out of range: "
4462 "no jump island available");
4465 word = offsetToJumpIsland;
4466 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4467 barf("unconditional relative branch out of range: "
4468 "jump island out of range");
4470 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4475 barf("\nunknown relocation %d",reloc->r_type);
4483 static int ocGetNames_MachO(ObjectCode* oc)
4485 char *image = (char*) oc->image;
4486 struct mach_header *header = (struct mach_header*) image;
4487 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4488 unsigned i,curSymbol = 0;
4489 struct segment_command *segLC = NULL;
4490 struct section *sections;
4491 struct symtab_command *symLC = NULL;
4492 struct nlist *nlist;
4493 unsigned long commonSize = 0;
4494 char *commonStorage = NULL;
4495 unsigned long commonCounter;
4497 for(i=0;i<header->ncmds;i++)
4499 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4500 segLC = (struct segment_command*) lc;
4501 else if(lc->cmd == LC_SYMTAB)
4502 symLC = (struct symtab_command*) lc;
4503 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4506 sections = (struct section*) (segLC+1);
4507 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4511 barf("ocGetNames_MachO: no segment load command");
4513 for(i=0;i<segLC->nsects;i++)
4515 if(sections[i].size == 0)
4518 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4520 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4521 "ocGetNames_MachO(common symbols)");
4522 sections[i].offset = zeroFillArea - image;
4525 if(!strcmp(sections[i].sectname,"__text"))
4526 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4527 (void*) (image + sections[i].offset),
4528 (void*) (image + sections[i].offset + sections[i].size));
4529 else if(!strcmp(sections[i].sectname,"__const"))
4530 addSection(oc, SECTIONKIND_RWDATA,
4531 (void*) (image + sections[i].offset),
4532 (void*) (image + sections[i].offset + sections[i].size));
4533 else if(!strcmp(sections[i].sectname,"__data"))
4534 addSection(oc, SECTIONKIND_RWDATA,
4535 (void*) (image + sections[i].offset),
4536 (void*) (image + sections[i].offset + sections[i].size));
4537 else if(!strcmp(sections[i].sectname,"__bss")
4538 || !strcmp(sections[i].sectname,"__common"))
4539 addSection(oc, SECTIONKIND_RWDATA,
4540 (void*) (image + sections[i].offset),
4541 (void*) (image + sections[i].offset + sections[i].size));
4543 addProddableBlock(oc, (void*) (image + sections[i].offset),
4547 // count external symbols defined here
4551 for(i=0;i<symLC->nsyms;i++)
4553 if(nlist[i].n_type & N_STAB)
4555 else if(nlist[i].n_type & N_EXT)
4557 if((nlist[i].n_type & N_TYPE) == N_UNDF
4558 && (nlist[i].n_value != 0))
4560 commonSize += nlist[i].n_value;
4563 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4568 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4569 "ocGetNames_MachO(oc->symbols)");
4573 for(i=0;i<symLC->nsyms;i++)
4575 if(nlist[i].n_type & N_STAB)
4577 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4579 if(nlist[i].n_type & N_EXT)
4581 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4582 if((nlist[i].n_desc & N_WEAK_DEF) && lookupSymbol(nm))
4583 ; // weak definition, and we already have a definition
4586 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4588 + sections[nlist[i].n_sect-1].offset
4589 - sections[nlist[i].n_sect-1].addr
4590 + nlist[i].n_value);
4591 oc->symbols[curSymbol++] = nm;
4598 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4599 commonCounter = (unsigned long)commonStorage;
4602 for(i=0;i<symLC->nsyms;i++)
4604 if((nlist[i].n_type & N_TYPE) == N_UNDF
4605 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4607 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4608 unsigned long sz = nlist[i].n_value;
4610 nlist[i].n_value = commonCounter;
4612 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4613 (void*)commonCounter);
4614 oc->symbols[curSymbol++] = nm;
4616 commonCounter += sz;
4623 static int ocResolve_MachO(ObjectCode* oc)
4625 char *image = (char*) oc->image;
4626 struct mach_header *header = (struct mach_header*) image;
4627 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4629 struct segment_command *segLC = NULL;
4630 struct section *sections;
4631 struct symtab_command *symLC = NULL;
4632 struct dysymtab_command *dsymLC = NULL;
4633 struct nlist *nlist;
4635 for(i=0;i<header->ncmds;i++)
4637 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4638 segLC = (struct segment_command*) lc;
4639 else if(lc->cmd == LC_SYMTAB)
4640 symLC = (struct symtab_command*) lc;
4641 else if(lc->cmd == LC_DYSYMTAB)
4642 dsymLC = (struct dysymtab_command*) lc;
4643 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4646 sections = (struct section*) (segLC+1);
4647 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4652 unsigned long *indirectSyms
4653 = (unsigned long*) (image + dsymLC->indirectsymoff);
4655 for(i=0;i<segLC->nsects;i++)
4657 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4658 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4659 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4661 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4664 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4665 || !strcmp(sections[i].sectname,"__pointers"))
4667 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4670 else if(!strcmp(sections[i].sectname,"__jump_table"))
4672 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4678 for(i=0;i<segLC->nsects;i++)
4680 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4684 #if defined (powerpc_HOST_ARCH)
4685 ocFlushInstructionCache( oc );
4691 #ifdef powerpc_HOST_ARCH
4693 * The Mach-O object format uses leading underscores. But not everywhere.
4694 * There is a small number of runtime support functions defined in
4695 * libcc_dynamic.a whose name does not have a leading underscore.
4696 * As a consequence, we can't get their address from C code.
4697 * We have to use inline assembler just to take the address of a function.
4701 static void machoInitSymbolsWithoutUnderscore()
4703 extern void* symbolsWithoutUnderscore[];
4704 void **p = symbolsWithoutUnderscore;
4705 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4707 #undef SymI_NeedsProto
4708 #define SymI_NeedsProto(x) \
4709 __asm__ volatile(".long " # x);
4711 RTS_MACHO_NOUNDERLINE_SYMBOLS
4713 __asm__ volatile(".text");
4715 #undef SymI_NeedsProto
4716 #define SymI_NeedsProto(x) \
4717 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4719 RTS_MACHO_NOUNDERLINE_SYMBOLS
4721 #undef SymI_NeedsProto
4726 * Figure out by how much to shift the entire Mach-O file in memory
4727 * when loading so that its single segment ends up 16-byte-aligned
4729 static int machoGetMisalignment( FILE * f )
4731 struct mach_header header;
4734 fread(&header, sizeof(header), 1, f);
4737 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
4738 if(header.magic != MH_MAGIC_64)
4741 if(header.magic != MH_MAGIC)
4745 misalignment = (header.sizeofcmds + sizeof(header))
4748 return misalignment ? (16 - misalignment) : 0;