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 {
226 #define Maybe_Stable_Names SymI_HasProto(mkWeakzh_fast) \
227 SymI_HasProto(mkWeakForeignEnvzh_fast) \
228 SymI_HasProto(makeStableNamezh_fast) \
229 SymI_HasProto(finalizzeWeakzh_fast)
231 /* These are not available in GUM!!! -- HWL */
232 #define Maybe_Stable_Names
235 #if !defined (mingw32_HOST_OS)
236 #define RTS_POSIX_ONLY_SYMBOLS \
237 SymI_HasProto(shutdownHaskellAndSignal) \
238 SymI_NeedsProto(lockFile) \
239 SymI_NeedsProto(unlockFile) \
240 SymI_HasProto(signal_handlers) \
241 SymI_HasProto(stg_sig_install) \
242 SymI_NeedsProto(nocldstop)
245 #if defined (cygwin32_HOST_OS)
246 #define RTS_MINGW_ONLY_SYMBOLS /**/
247 /* Don't have the ability to read import libs / archives, so
248 * we have to stupidly list a lot of what libcygwin.a
251 #define RTS_CYGWIN_ONLY_SYMBOLS \
252 SymI_HasProto(regfree) \
253 SymI_HasProto(regexec) \
254 SymI_HasProto(regerror) \
255 SymI_HasProto(regcomp) \
256 SymI_HasProto(__errno) \
257 SymI_HasProto(access) \
258 SymI_HasProto(chmod) \
259 SymI_HasProto(chdir) \
260 SymI_HasProto(close) \
261 SymI_HasProto(creat) \
263 SymI_HasProto(dup2) \
264 SymI_HasProto(fstat) \
265 SymI_HasProto(fcntl) \
266 SymI_HasProto(getcwd) \
267 SymI_HasProto(getenv) \
268 SymI_HasProto(lseek) \
269 SymI_HasProto(open) \
270 SymI_HasProto(fpathconf) \
271 SymI_HasProto(pathconf) \
272 SymI_HasProto(stat) \
274 SymI_HasProto(tanh) \
275 SymI_HasProto(cosh) \
276 SymI_HasProto(sinh) \
277 SymI_HasProto(atan) \
278 SymI_HasProto(acos) \
279 SymI_HasProto(asin) \
285 SymI_HasProto(sqrt) \
286 SymI_HasProto(localtime_r) \
287 SymI_HasProto(gmtime_r) \
288 SymI_HasProto(mktime) \
289 SymI_NeedsProto(_imp___tzname) \
290 SymI_HasProto(gettimeofday) \
291 SymI_HasProto(timezone) \
292 SymI_HasProto(tcgetattr) \
293 SymI_HasProto(tcsetattr) \
294 SymI_HasProto(memcpy) \
295 SymI_HasProto(memmove) \
296 SymI_HasProto(realloc) \
297 SymI_HasProto(malloc) \
298 SymI_HasProto(free) \
299 SymI_HasProto(fork) \
300 SymI_HasProto(lstat) \
301 SymI_HasProto(isatty) \
302 SymI_HasProto(mkdir) \
303 SymI_HasProto(opendir) \
304 SymI_HasProto(readdir) \
305 SymI_HasProto(rewinddir) \
306 SymI_HasProto(closedir) \
307 SymI_HasProto(link) \
308 SymI_HasProto(mkfifo) \
309 SymI_HasProto(pipe) \
310 SymI_HasProto(read) \
311 SymI_HasProto(rename) \
312 SymI_HasProto(rmdir) \
313 SymI_HasProto(select) \
314 SymI_HasProto(system) \
315 SymI_HasProto(write) \
316 SymI_HasProto(strcmp) \
317 SymI_HasProto(strcpy) \
318 SymI_HasProto(strncpy) \
319 SymI_HasProto(strerror) \
320 SymI_HasProto(sigaddset) \
321 SymI_HasProto(sigemptyset) \
322 SymI_HasProto(sigprocmask) \
323 SymI_HasProto(umask) \
324 SymI_HasProto(uname) \
325 SymI_HasProto(unlink) \
326 SymI_HasProto(utime) \
327 SymI_HasProto(waitpid)
329 #elif !defined(mingw32_HOST_OS)
330 #define RTS_MINGW_ONLY_SYMBOLS /**/
331 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
332 #else /* defined(mingw32_HOST_OS) */
333 #define RTS_POSIX_ONLY_SYMBOLS /**/
334 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
336 /* Extra syms gen'ed by mingw-2's gcc-3.2: */
338 #define RTS_MINGW_EXTRA_SYMS \
339 SymI_NeedsProto(_imp____mb_cur_max) \
340 SymI_NeedsProto(_imp___pctype)
342 #define RTS_MINGW_EXTRA_SYMS
345 #if HAVE_GETTIMEOFDAY
346 #define RTS_MINGW_GETTIMEOFDAY_SYM SymI_NeedsProto(gettimeofday)
348 #define RTS_MINGW_GETTIMEOFDAY_SYM /**/
351 /* These are statically linked from the mingw libraries into the ghc
352 executable, so we have to employ this hack. */
353 #define RTS_MINGW_ONLY_SYMBOLS \
354 SymI_HasProto(asyncReadzh_fast) \
355 SymI_HasProto(asyncWritezh_fast) \
356 SymI_HasProto(asyncDoProczh_fast) \
357 SymI_HasProto(memset) \
358 SymI_HasProto(inet_ntoa) \
359 SymI_HasProto(inet_addr) \
360 SymI_HasProto(htonl) \
361 SymI_HasProto(recvfrom) \
362 SymI_HasProto(listen) \
363 SymI_HasProto(bind) \
364 SymI_HasProto(shutdown) \
365 SymI_HasProto(connect) \
366 SymI_HasProto(htons) \
367 SymI_HasProto(ntohs) \
368 SymI_HasProto(getservbyname) \
369 SymI_HasProto(getservbyport) \
370 SymI_HasProto(getprotobynumber) \
371 SymI_HasProto(getprotobyname) \
372 SymI_HasProto(gethostbyname) \
373 SymI_HasProto(gethostbyaddr) \
374 SymI_HasProto(gethostname) \
375 SymI_HasProto(strcpy) \
376 SymI_HasProto(strncpy) \
377 SymI_HasProto(abort) \
378 SymI_NeedsProto(_alloca) \
379 SymI_NeedsProto(isxdigit) \
380 SymI_NeedsProto(isupper) \
381 SymI_NeedsProto(ispunct) \
382 SymI_NeedsProto(islower) \
383 SymI_NeedsProto(isspace) \
384 SymI_NeedsProto(isprint) \
385 SymI_NeedsProto(isdigit) \
386 SymI_NeedsProto(iscntrl) \
387 SymI_NeedsProto(isalpha) \
388 SymI_NeedsProto(isalnum) \
389 SymI_HasProto(strcmp) \
390 SymI_HasProto(memmove) \
391 SymI_HasProto(realloc) \
392 SymI_HasProto(malloc) \
394 SymI_HasProto(tanh) \
395 SymI_HasProto(cosh) \
396 SymI_HasProto(sinh) \
397 SymI_HasProto(atan) \
398 SymI_HasProto(acos) \
399 SymI_HasProto(asin) \
405 SymI_HasProto(sqrt) \
406 SymI_HasProto(powf) \
407 SymI_HasProto(tanhf) \
408 SymI_HasProto(coshf) \
409 SymI_HasProto(sinhf) \
410 SymI_HasProto(atanf) \
411 SymI_HasProto(acosf) \
412 SymI_HasProto(asinf) \
413 SymI_HasProto(tanf) \
414 SymI_HasProto(cosf) \
415 SymI_HasProto(sinf) \
416 SymI_HasProto(expf) \
417 SymI_HasProto(logf) \
418 SymI_HasProto(sqrtf) \
419 SymI_HasProto(memcpy) \
420 SymI_HasProto(rts_InstallConsoleEvent) \
421 SymI_HasProto(rts_ConsoleHandlerDone) \
422 SymI_NeedsProto(mktime) \
423 SymI_NeedsProto(_imp___timezone) \
424 SymI_NeedsProto(_imp___tzname) \
425 SymI_NeedsProto(_imp__tzname) \
426 SymI_NeedsProto(_imp___iob) \
427 SymI_NeedsProto(_imp___osver) \
428 SymI_NeedsProto(localtime) \
429 SymI_NeedsProto(gmtime) \
430 SymI_NeedsProto(opendir) \
431 SymI_NeedsProto(readdir) \
432 SymI_NeedsProto(rewinddir) \
433 RTS_MINGW_EXTRA_SYMS \
434 RTS_MINGW_GETTIMEOFDAY_SYM \
435 SymI_NeedsProto(closedir)
438 #if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
439 #define RTS_DARWIN_ONLY_SYMBOLS \
440 SymI_NeedsProto(asprintf$LDBLStub) \
441 SymI_NeedsProto(err$LDBLStub) \
442 SymI_NeedsProto(errc$LDBLStub) \
443 SymI_NeedsProto(errx$LDBLStub) \
444 SymI_NeedsProto(fprintf$LDBLStub) \
445 SymI_NeedsProto(fscanf$LDBLStub) \
446 SymI_NeedsProto(fwprintf$LDBLStub) \
447 SymI_NeedsProto(fwscanf$LDBLStub) \
448 SymI_NeedsProto(printf$LDBLStub) \
449 SymI_NeedsProto(scanf$LDBLStub) \
450 SymI_NeedsProto(snprintf$LDBLStub) \
451 SymI_NeedsProto(sprintf$LDBLStub) \
452 SymI_NeedsProto(sscanf$LDBLStub) \
453 SymI_NeedsProto(strtold$LDBLStub) \
454 SymI_NeedsProto(swprintf$LDBLStub) \
455 SymI_NeedsProto(swscanf$LDBLStub) \
456 SymI_NeedsProto(syslog$LDBLStub) \
457 SymI_NeedsProto(vasprintf$LDBLStub) \
458 SymI_NeedsProto(verr$LDBLStub) \
459 SymI_NeedsProto(verrc$LDBLStub) \
460 SymI_NeedsProto(verrx$LDBLStub) \
461 SymI_NeedsProto(vfprintf$LDBLStub) \
462 SymI_NeedsProto(vfscanf$LDBLStub) \
463 SymI_NeedsProto(vfwprintf$LDBLStub) \
464 SymI_NeedsProto(vfwscanf$LDBLStub) \
465 SymI_NeedsProto(vprintf$LDBLStub) \
466 SymI_NeedsProto(vscanf$LDBLStub) \
467 SymI_NeedsProto(vsnprintf$LDBLStub) \
468 SymI_NeedsProto(vsprintf$LDBLStub) \
469 SymI_NeedsProto(vsscanf$LDBLStub) \
470 SymI_NeedsProto(vswprintf$LDBLStub) \
471 SymI_NeedsProto(vswscanf$LDBLStub) \
472 SymI_NeedsProto(vsyslog$LDBLStub) \
473 SymI_NeedsProto(vwarn$LDBLStub) \
474 SymI_NeedsProto(vwarnc$LDBLStub) \
475 SymI_NeedsProto(vwarnx$LDBLStub) \
476 SymI_NeedsProto(vwprintf$LDBLStub) \
477 SymI_NeedsProto(vwscanf$LDBLStub) \
478 SymI_NeedsProto(warn$LDBLStub) \
479 SymI_NeedsProto(warnc$LDBLStub) \
480 SymI_NeedsProto(warnx$LDBLStub) \
481 SymI_NeedsProto(wcstold$LDBLStub) \
482 SymI_NeedsProto(wprintf$LDBLStub) \
483 SymI_NeedsProto(wscanf$LDBLStub)
485 #define RTS_DARWIN_ONLY_SYMBOLS
489 # define MAIN_CAP_SYM SymI_HasProto(MainCapability)
491 # define MAIN_CAP_SYM
494 #if !defined(mingw32_HOST_OS)
495 #define RTS_USER_SIGNALS_SYMBOLS \
496 SymI_HasProto(setIOManagerPipe) \
497 SymI_NeedsProto(blockUserSignals) \
498 SymI_NeedsProto(unblockUserSignals)
500 #define RTS_USER_SIGNALS_SYMBOLS \
501 SymI_HasProto(sendIOManagerEvent) \
502 SymI_HasProto(readIOManagerEvent) \
503 SymI_HasProto(getIOManagerEvent) \
504 SymI_HasProto(console_handler)
507 #define RTS_LIBFFI_SYMBOLS \
508 SymE_NeedsProto(ffi_prep_cif) \
509 SymE_NeedsProto(ffi_call) \
510 SymE_NeedsProto(ffi_type_void) \
511 SymE_NeedsProto(ffi_type_float) \
512 SymE_NeedsProto(ffi_type_double) \
513 SymE_NeedsProto(ffi_type_sint64) \
514 SymE_NeedsProto(ffi_type_uint64) \
515 SymE_NeedsProto(ffi_type_sint32) \
516 SymE_NeedsProto(ffi_type_uint32) \
517 SymE_NeedsProto(ffi_type_sint16) \
518 SymE_NeedsProto(ffi_type_uint16) \
519 SymE_NeedsProto(ffi_type_sint8) \
520 SymE_NeedsProto(ffi_type_uint8) \
521 SymE_NeedsProto(ffi_type_pointer)
523 #ifdef TABLES_NEXT_TO_CODE
524 #define RTS_RET_SYMBOLS /* nothing */
526 #define RTS_RET_SYMBOLS \
527 SymI_HasProto(stg_enter_ret) \
528 SymI_HasProto(stg_gc_fun_ret) \
529 SymI_HasProto(stg_ap_v_ret) \
530 SymI_HasProto(stg_ap_f_ret) \
531 SymI_HasProto(stg_ap_d_ret) \
532 SymI_HasProto(stg_ap_l_ret) \
533 SymI_HasProto(stg_ap_n_ret) \
534 SymI_HasProto(stg_ap_p_ret) \
535 SymI_HasProto(stg_ap_pv_ret) \
536 SymI_HasProto(stg_ap_pp_ret) \
537 SymI_HasProto(stg_ap_ppv_ret) \
538 SymI_HasProto(stg_ap_ppp_ret) \
539 SymI_HasProto(stg_ap_pppv_ret) \
540 SymI_HasProto(stg_ap_pppp_ret) \
541 SymI_HasProto(stg_ap_ppppp_ret) \
542 SymI_HasProto(stg_ap_pppppp_ret)
545 /* On Windows, we link libgmp.a statically into libHSrts.dll */
546 #ifdef mingw32_HOST_OS
548 SymI_HasProto(__gmpz_cmp) \
549 SymI_HasProto(__gmpz_cmp_si) \
550 SymI_HasProto(__gmpz_cmp_ui) \
551 SymI_HasProto(__gmpz_get_si) \
552 SymI_HasProto(__gmpz_get_ui)
555 SymE_HasProto(__gmpz_cmp) \
556 SymE_HasProto(__gmpz_cmp_si) \
557 SymE_HasProto(__gmpz_cmp_ui) \
558 SymE_HasProto(__gmpz_get_si) \
559 SymE_HasProto(__gmpz_get_ui)
562 #define RTS_SYMBOLS \
564 SymI_HasProto(StgReturn) \
565 SymI_HasProto(stg_enter_info) \
566 SymI_HasProto(stg_gc_void_info) \
567 SymI_HasProto(__stg_gc_enter_1) \
568 SymI_HasProto(stg_gc_noregs) \
569 SymI_HasProto(stg_gc_unpt_r1_info) \
570 SymI_HasProto(stg_gc_unpt_r1) \
571 SymI_HasProto(stg_gc_unbx_r1_info) \
572 SymI_HasProto(stg_gc_unbx_r1) \
573 SymI_HasProto(stg_gc_f1_info) \
574 SymI_HasProto(stg_gc_f1) \
575 SymI_HasProto(stg_gc_d1_info) \
576 SymI_HasProto(stg_gc_d1) \
577 SymI_HasProto(stg_gc_l1_info) \
578 SymI_HasProto(stg_gc_l1) \
579 SymI_HasProto(__stg_gc_fun) \
580 SymI_HasProto(stg_gc_fun_info) \
581 SymI_HasProto(stg_gc_gen) \
582 SymI_HasProto(stg_gc_gen_info) \
583 SymI_HasProto(stg_gc_gen_hp) \
584 SymI_HasProto(stg_gc_ut) \
585 SymI_HasProto(stg_gen_yield) \
586 SymI_HasProto(stg_yield_noregs) \
587 SymI_HasProto(stg_yield_to_interpreter) \
588 SymI_HasProto(stg_gen_block) \
589 SymI_HasProto(stg_block_noregs) \
590 SymI_HasProto(stg_block_1) \
591 SymI_HasProto(stg_block_takemvar) \
592 SymI_HasProto(stg_block_putmvar) \
594 SymI_HasProto(MallocFailHook) \
595 SymI_HasProto(OnExitHook) \
596 SymI_HasProto(OutOfHeapHook) \
597 SymI_HasProto(StackOverflowHook) \
598 SymI_HasProto(__encodeDouble) \
599 SymI_HasProto(__encodeFloat) \
600 SymI_HasProto(addDLL) \
602 SymI_HasProto(__int_encodeDouble) \
603 SymI_HasProto(__word_encodeDouble) \
604 SymI_HasProto(__2Int_encodeDouble) \
605 SymI_HasProto(__int_encodeFloat) \
606 SymI_HasProto(__word_encodeFloat) \
607 SymI_HasProto(andIntegerzh_fast) \
608 SymI_HasProto(atomicallyzh_fast) \
609 SymI_HasProto(barf) \
610 SymI_HasProto(debugBelch) \
611 SymI_HasProto(errorBelch) \
612 SymI_HasProto(sysErrorBelch) \
613 SymI_HasProto(asyncExceptionsBlockedzh_fast) \
614 SymI_HasProto(blockAsyncExceptionszh_fast) \
615 SymI_HasProto(catchzh_fast) \
616 SymI_HasProto(catchRetryzh_fast) \
617 SymI_HasProto(catchSTMzh_fast) \
618 SymI_HasProto(checkzh_fast) \
619 SymI_HasProto(closure_flags) \
620 SymI_HasProto(cmp_thread) \
621 SymI_HasProto(cmpIntegerzh_fast) \
622 SymI_HasProto(cmpIntegerIntzh_fast) \
623 SymI_HasProto(complementIntegerzh_fast) \
624 SymI_HasProto(createAdjustor) \
625 SymI_HasProto(decodeDoublezh_fast) \
626 SymI_HasProto(decodeFloatzh_fast) \
627 SymI_HasProto(decodeDoublezu2Intzh_fast) \
628 SymI_HasProto(decodeFloatzuIntzh_fast) \
629 SymI_HasProto(defaultsHook) \
630 SymI_HasProto(delayzh_fast) \
631 SymI_HasProto(deRefWeakzh_fast) \
632 SymI_HasProto(deRefStablePtrzh_fast) \
633 SymI_HasProto(dirty_MUT_VAR) \
634 SymI_HasProto(divExactIntegerzh_fast) \
635 SymI_HasProto(divModIntegerzh_fast) \
636 SymI_HasProto(forkzh_fast) \
637 SymI_HasProto(forkOnzh_fast) \
638 SymI_HasProto(forkProcess) \
639 SymI_HasProto(forkOS_createThread) \
640 SymI_HasProto(freeHaskellFunctionPtr) \
641 SymI_HasProto(freeStablePtr) \
642 SymI_HasProto(getOrSetTypeableStore) \
643 SymI_HasProto(getOrSetSignalHandlerStore) \
644 SymI_HasProto(gcdIntegerzh_fast) \
645 SymI_HasProto(gcdIntegerIntzh_fast) \
646 SymI_HasProto(gcdIntzh_fast) \
647 SymI_HasProto(genSymZh) \
648 SymI_HasProto(genericRaise) \
649 SymI_HasProto(getProgArgv) \
650 SymI_HasProto(getFullProgArgv) \
651 SymI_HasProto(getStablePtr) \
652 SymI_HasProto(hs_init) \
653 SymI_HasProto(hs_exit) \
654 SymI_HasProto(hs_set_argv) \
655 SymI_HasProto(hs_add_root) \
656 SymI_HasProto(hs_perform_gc) \
657 SymI_HasProto(hs_free_stable_ptr) \
658 SymI_HasProto(hs_free_fun_ptr) \
659 SymI_HasProto(hs_hpc_rootModule) \
660 SymI_HasProto(hs_hpc_module) \
661 SymI_HasProto(initLinker) \
662 SymI_HasProto(unpackClosurezh_fast) \
663 SymI_HasProto(getApStackValzh_fast) \
664 SymI_HasProto(getSparkzh_fast) \
665 SymI_HasProto(int2Integerzh_fast) \
666 SymI_HasProto(integer2Intzh_fast) \
667 SymI_HasProto(integer2Wordzh_fast) \
668 SymI_HasProto(isCurrentThreadBoundzh_fast) \
669 SymI_HasProto(isDoubleDenormalized) \
670 SymI_HasProto(isDoubleInfinite) \
671 SymI_HasProto(isDoubleNaN) \
672 SymI_HasProto(isDoubleNegativeZero) \
673 SymI_HasProto(isEmptyMVarzh_fast) \
674 SymI_HasProto(isFloatDenormalized) \
675 SymI_HasProto(isFloatInfinite) \
676 SymI_HasProto(isFloatNaN) \
677 SymI_HasProto(isFloatNegativeZero) \
678 SymI_HasProto(killThreadzh_fast) \
679 SymI_HasProto(loadObj) \
680 SymI_HasProto(insertStableSymbol) \
681 SymI_HasProto(insertSymbol) \
682 SymI_HasProto(lookupSymbol) \
683 SymI_HasProto(makeStablePtrzh_fast) \
684 SymI_HasProto(minusIntegerzh_fast) \
685 SymI_HasProto(mkApUpd0zh_fast) \
686 SymI_HasProto(myThreadIdzh_fast) \
687 SymI_HasProto(labelThreadzh_fast) \
688 SymI_HasProto(newArrayzh_fast) \
689 SymI_HasProto(newBCOzh_fast) \
690 SymI_HasProto(newByteArrayzh_fast) \
691 SymI_HasProto_redirect(newCAF, newDynCAF) \
692 SymI_HasProto(newMVarzh_fast) \
693 SymI_HasProto(newMutVarzh_fast) \
694 SymI_HasProto(newTVarzh_fast) \
695 SymI_HasProto(noDuplicatezh_fast) \
696 SymI_HasProto(atomicModifyMutVarzh_fast) \
697 SymI_HasProto(newPinnedByteArrayzh_fast) \
698 SymI_HasProto(newAlignedPinnedByteArrayzh_fast) \
699 SymI_HasProto(newSpark) \
700 SymI_HasProto(orIntegerzh_fast) \
701 SymI_HasProto(performGC) \
702 SymI_HasProto(performMajorGC) \
703 SymI_HasProto(plusIntegerzh_fast) \
704 SymI_HasProto(prog_argc) \
705 SymI_HasProto(prog_argv) \
706 SymI_HasProto(putMVarzh_fast) \
707 SymI_HasProto(quotIntegerzh_fast) \
708 SymI_HasProto(quotRemIntegerzh_fast) \
709 SymI_HasProto(raisezh_fast) \
710 SymI_HasProto(raiseIOzh_fast) \
711 SymI_HasProto(readTVarzh_fast) \
712 SymI_HasProto(readTVarIOzh_fast) \
713 SymI_HasProto(remIntegerzh_fast) \
714 SymI_HasProto(resetNonBlockingFd) \
715 SymI_HasProto(resumeThread) \
716 SymI_HasProto(resolveObjs) \
717 SymI_HasProto(retryzh_fast) \
718 SymI_HasProto(rts_apply) \
719 SymI_HasProto(rts_checkSchedStatus) \
720 SymI_HasProto(rts_eval) \
721 SymI_HasProto(rts_evalIO) \
722 SymI_HasProto(rts_evalLazyIO) \
723 SymI_HasProto(rts_evalStableIO) \
724 SymI_HasProto(rts_eval_) \
725 SymI_HasProto(rts_getBool) \
726 SymI_HasProto(rts_getChar) \
727 SymI_HasProto(rts_getDouble) \
728 SymI_HasProto(rts_getFloat) \
729 SymI_HasProto(rts_getInt) \
730 SymI_HasProto(rts_getInt8) \
731 SymI_HasProto(rts_getInt16) \
732 SymI_HasProto(rts_getInt32) \
733 SymI_HasProto(rts_getInt64) \
734 SymI_HasProto(rts_getPtr) \
735 SymI_HasProto(rts_getFunPtr) \
736 SymI_HasProto(rts_getStablePtr) \
737 SymI_HasProto(rts_getThreadId) \
738 SymI_HasProto(rts_getWord) \
739 SymI_HasProto(rts_getWord8) \
740 SymI_HasProto(rts_getWord16) \
741 SymI_HasProto(rts_getWord32) \
742 SymI_HasProto(rts_getWord64) \
743 SymI_HasProto(rts_lock) \
744 SymI_HasProto(rts_mkBool) \
745 SymI_HasProto(rts_mkChar) \
746 SymI_HasProto(rts_mkDouble) \
747 SymI_HasProto(rts_mkFloat) \
748 SymI_HasProto(rts_mkInt) \
749 SymI_HasProto(rts_mkInt8) \
750 SymI_HasProto(rts_mkInt16) \
751 SymI_HasProto(rts_mkInt32) \
752 SymI_HasProto(rts_mkInt64) \
753 SymI_HasProto(rts_mkPtr) \
754 SymI_HasProto(rts_mkFunPtr) \
755 SymI_HasProto(rts_mkStablePtr) \
756 SymI_HasProto(rts_mkString) \
757 SymI_HasProto(rts_mkWord) \
758 SymI_HasProto(rts_mkWord8) \
759 SymI_HasProto(rts_mkWord16) \
760 SymI_HasProto(rts_mkWord32) \
761 SymI_HasProto(rts_mkWord64) \
762 SymI_HasProto(rts_unlock) \
763 SymI_HasProto(rtsSupportsBoundThreads) \
764 SymI_HasProto(__hscore_get_saved_termios) \
765 SymI_HasProto(__hscore_set_saved_termios) \
766 SymI_HasProto(setProgArgv) \
767 SymI_HasProto(startupHaskell) \
768 SymI_HasProto(shutdownHaskell) \
769 SymI_HasProto(shutdownHaskellAndExit) \
770 SymI_HasProto(stable_ptr_table) \
771 SymI_HasProto(stackOverflow) \
772 SymI_HasProto(stg_CAF_BLACKHOLE_info) \
773 SymI_HasProto(__stg_EAGER_BLACKHOLE_info) \
774 SymI_HasProto(awakenBlockedQueue) \
775 SymI_HasProto(startTimer) \
776 SymI_HasProto(stg_CHARLIKE_closure) \
777 SymI_HasProto(stg_MVAR_CLEAN_info) \
778 SymI_HasProto(stg_MVAR_DIRTY_info) \
779 SymI_HasProto(stg_IND_STATIC_info) \
780 SymI_HasProto(stg_INTLIKE_closure) \
781 SymI_HasProto(stg_MUT_ARR_PTRS_DIRTY_info) \
782 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN_info) \
783 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN0_info) \
784 SymI_HasProto(stg_WEAK_info) \
785 SymI_HasProto(stg_ap_v_info) \
786 SymI_HasProto(stg_ap_f_info) \
787 SymI_HasProto(stg_ap_d_info) \
788 SymI_HasProto(stg_ap_l_info) \
789 SymI_HasProto(stg_ap_n_info) \
790 SymI_HasProto(stg_ap_p_info) \
791 SymI_HasProto(stg_ap_pv_info) \
792 SymI_HasProto(stg_ap_pp_info) \
793 SymI_HasProto(stg_ap_ppv_info) \
794 SymI_HasProto(stg_ap_ppp_info) \
795 SymI_HasProto(stg_ap_pppv_info) \
796 SymI_HasProto(stg_ap_pppp_info) \
797 SymI_HasProto(stg_ap_ppppp_info) \
798 SymI_HasProto(stg_ap_pppppp_info) \
799 SymI_HasProto(stg_ap_0_fast) \
800 SymI_HasProto(stg_ap_v_fast) \
801 SymI_HasProto(stg_ap_f_fast) \
802 SymI_HasProto(stg_ap_d_fast) \
803 SymI_HasProto(stg_ap_l_fast) \
804 SymI_HasProto(stg_ap_n_fast) \
805 SymI_HasProto(stg_ap_p_fast) \
806 SymI_HasProto(stg_ap_pv_fast) \
807 SymI_HasProto(stg_ap_pp_fast) \
808 SymI_HasProto(stg_ap_ppv_fast) \
809 SymI_HasProto(stg_ap_ppp_fast) \
810 SymI_HasProto(stg_ap_pppv_fast) \
811 SymI_HasProto(stg_ap_pppp_fast) \
812 SymI_HasProto(stg_ap_ppppp_fast) \
813 SymI_HasProto(stg_ap_pppppp_fast) \
814 SymI_HasProto(stg_ap_1_upd_info) \
815 SymI_HasProto(stg_ap_2_upd_info) \
816 SymI_HasProto(stg_ap_3_upd_info) \
817 SymI_HasProto(stg_ap_4_upd_info) \
818 SymI_HasProto(stg_ap_5_upd_info) \
819 SymI_HasProto(stg_ap_6_upd_info) \
820 SymI_HasProto(stg_ap_7_upd_info) \
821 SymI_HasProto(stg_exit) \
822 SymI_HasProto(stg_sel_0_upd_info) \
823 SymI_HasProto(stg_sel_10_upd_info) \
824 SymI_HasProto(stg_sel_11_upd_info) \
825 SymI_HasProto(stg_sel_12_upd_info) \
826 SymI_HasProto(stg_sel_13_upd_info) \
827 SymI_HasProto(stg_sel_14_upd_info) \
828 SymI_HasProto(stg_sel_15_upd_info) \
829 SymI_HasProto(stg_sel_1_upd_info) \
830 SymI_HasProto(stg_sel_2_upd_info) \
831 SymI_HasProto(stg_sel_3_upd_info) \
832 SymI_HasProto(stg_sel_4_upd_info) \
833 SymI_HasProto(stg_sel_5_upd_info) \
834 SymI_HasProto(stg_sel_6_upd_info) \
835 SymI_HasProto(stg_sel_7_upd_info) \
836 SymI_HasProto(stg_sel_8_upd_info) \
837 SymI_HasProto(stg_sel_9_upd_info) \
838 SymI_HasProto(stg_upd_frame_info) \
839 SymI_HasProto(suspendThread) \
840 SymI_HasProto(takeMVarzh_fast) \
841 SymI_HasProto(threadStatuszh_fast) \
842 SymI_HasProto(timesIntegerzh_fast) \
843 SymI_HasProto(tryPutMVarzh_fast) \
844 SymI_HasProto(tryTakeMVarzh_fast) \
845 SymI_HasProto(unblockAsyncExceptionszh_fast) \
846 SymI_HasProto(unloadObj) \
847 SymI_HasProto(unsafeThawArrayzh_fast) \
848 SymI_HasProto(waitReadzh_fast) \
849 SymI_HasProto(waitWritezh_fast) \
850 SymI_HasProto(word2Integerzh_fast) \
851 SymI_HasProto(writeTVarzh_fast) \
852 SymI_HasProto(xorIntegerzh_fast) \
853 SymI_HasProto(yieldzh_fast) \
854 SymI_NeedsProto(stg_interp_constr_entry) \
855 SymI_HasProto(allocateExec) \
856 SymI_HasProto(freeExec) \
857 SymI_HasProto(getAllocations) \
858 SymI_HasProto(revertCAFs) \
859 SymI_HasProto(RtsFlags) \
860 SymI_NeedsProto(rts_breakpoint_io_action) \
861 SymI_NeedsProto(rts_stop_next_breakpoint) \
862 SymI_NeedsProto(rts_stop_on_exception) \
863 SymI_HasProto(stopTimer) \
864 SymI_HasProto(n_capabilities) \
865 SymI_HasProto(traceCcszh_fast) \
866 RTS_USER_SIGNALS_SYMBOLS
868 #ifdef SUPPORT_LONG_LONGS
869 #define RTS_LONG_LONG_SYMS \
870 SymI_HasProto(int64ToIntegerzh_fast) \
871 SymI_HasProto(word64ToIntegerzh_fast)
873 #define RTS_LONG_LONG_SYMS /* nothing */
876 // 64-bit support functions in libgcc.a
877 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
878 #define RTS_LIBGCC_SYMBOLS \
879 SymI_NeedsProto(__divdi3) \
880 SymI_NeedsProto(__udivdi3) \
881 SymI_NeedsProto(__moddi3) \
882 SymI_NeedsProto(__umoddi3) \
883 SymI_NeedsProto(__muldi3) \
884 SymI_NeedsProto(__ashldi3) \
885 SymI_NeedsProto(__ashrdi3) \
886 SymI_NeedsProto(__lshrdi3) \
887 SymI_NeedsProto(__eprintf)
888 #elif defined(ia64_HOST_ARCH)
889 #define RTS_LIBGCC_SYMBOLS \
890 SymI_NeedsProto(__divdi3) \
891 SymI_NeedsProto(__udivdi3) \
892 SymI_NeedsProto(__moddi3) \
893 SymI_NeedsProto(__umoddi3) \
894 SymI_NeedsProto(__divsf3) \
895 SymI_NeedsProto(__divdf3)
897 #define RTS_LIBGCC_SYMBOLS
900 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
901 // Symbols that don't have a leading underscore
902 // on Mac OS X. They have to receive special treatment,
903 // see machoInitSymbolsWithoutUnderscore()
904 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
905 SymI_NeedsProto(saveFP) \
906 SymI_NeedsProto(restFP)
909 /* entirely bogus claims about types of these symbols */
910 #define SymI_NeedsProto(vvv) extern void vvv(void);
911 #if defined(__PIC__) && defined(mingw32_TARGET_OS)
912 #define SymE_HasProto(vvv) SymE_HasProto(vvv);
913 #define SymE_NeedsProto(vvv) extern void _imp__ ## vvv (void);
915 #define SymE_NeedsProto(vvv) SymI_NeedsProto(vvv);
916 #define SymE_HasProto(vvv) SymI_HasProto(vvv)
918 #define SymI_HasProto(vvv) /**/
919 #define SymI_HasProto_redirect(vvv,xxx) /**/
923 RTS_POSIX_ONLY_SYMBOLS
924 RTS_MINGW_ONLY_SYMBOLS
925 RTS_CYGWIN_ONLY_SYMBOLS
926 RTS_DARWIN_ONLY_SYMBOLS
929 #undef SymI_NeedsProto
931 #undef SymI_HasProto_redirect
933 #undef SymE_NeedsProto
935 #ifdef LEADING_UNDERSCORE
936 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
938 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
941 #define SymI_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
943 #define SymE_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
944 (void*)DLL_IMPORT_DATA_REF(vvv) },
946 #define SymI_NeedsProto(vvv) SymI_HasProto(vvv)
947 #define SymE_NeedsProto(vvv) SymE_HasProto(vvv)
949 // SymI_HasProto_redirect allows us to redirect references to one symbol to
950 // another symbol. See newCAF/newDynCAF for an example.
951 #define SymI_HasProto_redirect(vvv,xxx) \
952 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
955 static RtsSymbolVal rtsSyms[] = {
959 RTS_POSIX_ONLY_SYMBOLS
960 RTS_MINGW_ONLY_SYMBOLS
961 RTS_CYGWIN_ONLY_SYMBOLS
962 RTS_DARWIN_ONLY_SYMBOLS
965 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
966 // dyld stub code contains references to this,
967 // but it should never be called because we treat
968 // lazy pointers as nonlazy.
969 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
971 { 0, 0 } /* sentinel */
976 /* -----------------------------------------------------------------------------
977 * Insert symbols into hash tables, checking for duplicates.
980 static void ghciInsertStrHashTable ( char* obj_name,
986 if (lookupHashTable(table, (StgWord)key) == NULL)
988 insertStrHashTable(table, (StgWord)key, data);
993 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
995 "whilst processing object file\n"
997 "This could be caused by:\n"
998 " * Loading two different object files which export the same symbol\n"
999 " * Specifying the same object file twice on the GHCi command line\n"
1000 " * An incorrect `package.conf' entry, causing some object to be\n"
1002 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
1009 /* -----------------------------------------------------------------------------
1010 * initialize the object linker
1014 static int linker_init_done = 0 ;
1016 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1017 static void *dl_prog_handle;
1025 /* Make initLinker idempotent, so we can call it
1026 before evey relevant operation; that means we
1027 don't need to initialise the linker separately */
1028 if (linker_init_done == 1) { return; } else {
1029 linker_init_done = 1;
1032 stablehash = allocStrHashTable();
1033 symhash = allocStrHashTable();
1035 /* populate the symbol table with stuff from the RTS */
1036 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
1037 ghciInsertStrHashTable("(GHCi built-in symbols)",
1038 symhash, sym->lbl, sym->addr);
1040 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1041 machoInitSymbolsWithoutUnderscore();
1044 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1045 # if defined(RTLD_DEFAULT)
1046 dl_prog_handle = RTLD_DEFAULT;
1048 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
1049 # endif /* RTLD_DEFAULT */
1052 #if defined(x86_64_HOST_ARCH)
1053 if (RtsFlags.MiscFlags.linkerMemBase != 0) {
1054 // User-override for mmap_32bit_base
1055 mmap_32bit_base = (void*)RtsFlags.MiscFlags.linkerMemBase;
1059 #if defined(mingw32_HOST_OS)
1061 * These two libraries cause problems when added to the static link,
1062 * but are necessary for resolving symbols in GHCi, hence we load
1063 * them manually here.
1070 /* -----------------------------------------------------------------------------
1071 * Loading DLL or .so dynamic libraries
1072 * -----------------------------------------------------------------------------
1074 * Add a DLL from which symbols may be found. In the ELF case, just
1075 * do RTLD_GLOBAL-style add, so no further messing around needs to
1076 * happen in order that symbols in the loaded .so are findable --
1077 * lookupSymbol() will subsequently see them by dlsym on the program's
1078 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
1080 * In the PEi386 case, open the DLLs and put handles to them in a
1081 * linked list. When looking for a symbol, try all handles in the
1082 * list. This means that we need to load even DLLs that are guaranteed
1083 * to be in the ghc.exe image already, just so we can get a handle
1084 * to give to loadSymbol, so that we can find the symbols. For such
1085 * libraries, the LoadLibrary call should be a no-op except for returning
1090 #if defined(OBJFORMAT_PEi386)
1091 /* A record for storing handles into DLLs. */
1096 struct _OpenedDLL* next;
1101 /* A list thereof. */
1102 static OpenedDLL* opened_dlls = NULL;
1106 addDLL( char *dll_name )
1108 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1109 /* ------------------- ELF DLL loader ------------------- */
1115 // omitted: RTLD_NOW
1116 // see http://www.haskell.org/pipermail/cvs-ghc/2007-September/038570.html
1117 hdl= dlopen(dll_name, RTLD_LAZY | RTLD_GLOBAL);
1120 /* dlopen failed; return a ptr to the error msg. */
1122 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1129 # elif defined(OBJFORMAT_PEi386)
1130 /* ------------------- Win32 DLL loader ------------------- */
1138 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1140 /* See if we've already got it, and ignore if so. */
1141 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1142 if (0 == strcmp(o_dll->name, dll_name))
1146 /* The file name has no suffix (yet) so that we can try
1147 both foo.dll and foo.drv
1149 The documentation for LoadLibrary says:
1150 If no file name extension is specified in the lpFileName
1151 parameter, the default library extension .dll is
1152 appended. However, the file name string can include a trailing
1153 point character (.) to indicate that the module name has no
1156 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1157 sprintf(buf, "%s.DLL", dll_name);
1158 instance = LoadLibrary(buf);
1159 if (instance == NULL) {
1160 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1161 // KAA: allow loading of drivers (like winspool.drv)
1162 sprintf(buf, "%s.DRV", dll_name);
1163 instance = LoadLibrary(buf);
1164 if (instance == NULL) {
1165 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1166 // #1883: allow loading of unix-style libfoo.dll DLLs
1167 sprintf(buf, "lib%s.DLL", dll_name);
1168 instance = LoadLibrary(buf);
1169 if (instance == NULL) {
1176 /* Add this DLL to the list of DLLs in which to search for symbols. */
1177 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1178 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1179 strcpy(o_dll->name, dll_name);
1180 o_dll->instance = instance;
1181 o_dll->next = opened_dlls;
1182 opened_dlls = o_dll;
1188 sysErrorBelch(dll_name);
1190 /* LoadLibrary failed; return a ptr to the error msg. */
1191 return "addDLL: could not load DLL";
1194 barf("addDLL: not implemented on this platform");
1198 /* -----------------------------------------------------------------------------
1199 * insert a stable symbol in the hash table
1203 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1205 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1209 /* -----------------------------------------------------------------------------
1210 * insert a symbol in the hash table
1213 insertSymbol(char* obj_name, char* key, void* data)
1215 ghciInsertStrHashTable(obj_name, symhash, key, data);
1218 /* -----------------------------------------------------------------------------
1219 * lookup a symbol in the hash table
1222 lookupSymbol( char *lbl )
1226 ASSERT(symhash != NULL);
1227 val = lookupStrHashTable(symhash, lbl);
1230 # if defined(OBJFORMAT_ELF)
1231 return dlsym(dl_prog_handle, lbl);
1232 # elif defined(OBJFORMAT_MACHO)
1234 /* On OS X 10.3 and later, we use dlsym instead of the old legacy
1237 HACK: On OS X, global symbols are prefixed with an underscore.
1238 However, dlsym wants us to omit the leading underscore from the
1239 symbol name. For now, we simply strip it off here (and ONLY
1242 ASSERT(lbl[0] == '_');
1243 return dlsym(dl_prog_handle, lbl+1);
1245 if(NSIsSymbolNameDefined(lbl)) {
1246 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1247 return NSAddressOfSymbol(symbol);
1251 # endif /* HAVE_DLFCN_H */
1252 # elif defined(OBJFORMAT_PEi386)
1255 sym = lookupSymbolInDLLs(lbl);
1256 if (sym != NULL) { return sym; };
1258 // Also try looking up the symbol without the @N suffix. Some
1259 // DLLs have the suffixes on their symbols, some don't.
1260 zapTrailingAtSign ( lbl );
1261 sym = lookupSymbolInDLLs(lbl);
1262 if (sym != NULL) { return sym; };
1274 /* -----------------------------------------------------------------------------
1275 * Debugging aid: look in GHCi's object symbol tables for symbols
1276 * within DELTA bytes of the specified address, and show their names.
1279 void ghci_enquire ( char* addr );
1281 void ghci_enquire ( char* addr )
1286 const int DELTA = 64;
1291 for (oc = objects; oc; oc = oc->next) {
1292 for (i = 0; i < oc->n_symbols; i++) {
1293 sym = oc->symbols[i];
1294 if (sym == NULL) continue;
1297 a = lookupStrHashTable(symhash, sym);
1300 // debugBelch("ghci_enquire: can't find %s\n", sym);
1302 else if (addr-DELTA <= a && a <= addr+DELTA) {
1303 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1310 #ifdef ia64_HOST_ARCH
1311 static unsigned int PLTSize(void);
1315 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1318 mmapForLinker (size_t bytes, nat flags, int fd)
1320 void *map_addr = NULL;
1323 static nat fixed = 0;
1325 pagesize = getpagesize();
1326 size = ROUND_UP(bytes, pagesize);
1328 #if defined(x86_64_HOST_ARCH)
1331 if (mmap_32bit_base != 0) {
1332 map_addr = mmap_32bit_base;
1336 result = mmap(map_addr, size, PROT_EXEC|PROT_READ|PROT_WRITE,
1337 MAP_PRIVATE|TRY_MAP_32BIT|fixed|flags, fd, 0);
1339 if (result == MAP_FAILED) {
1340 sysErrorBelch("mmap %lu bytes at %p",(lnat)size,map_addr);
1341 errorBelch("Try specifying an address with +RTS -xm<addr> -RTS");
1342 stg_exit(EXIT_FAILURE);
1345 #if defined(x86_64_HOST_ARCH)
1346 if (mmap_32bit_base != 0) {
1347 if (result == map_addr) {
1348 mmap_32bit_base = map_addr + size;
1350 if ((W_)result > 0x80000000) {
1351 // oops, we were given memory over 2Gb
1352 #if defined(freebsd_HOST_OS)
1353 // Some platforms require MAP_FIXED. This is normally
1354 // a bad idea, because MAP_FIXED will overwrite
1355 // existing mappings.
1356 munmap(result,size);
1360 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);
1363 // hmm, we were given memory somewhere else, but it's
1364 // still under 2Gb so we can use it. Next time, ask
1365 // for memory right after the place we just got some
1366 mmap_32bit_base = (void*)result + size;
1370 if ((W_)result > 0x80000000) {
1371 // oops, we were given memory over 2Gb
1372 // ... try allocating memory somewhere else?;
1373 debugTrace(DEBUG_linker,"MAP_32BIT didn't work; gave us %lu bytes at 0x%p", bytes, result);
1374 munmap(result, size);
1376 // Set a base address and try again... (guess: 1Gb)
1377 mmap_32bit_base = (void*)0x40000000;
1387 /* -----------------------------------------------------------------------------
1388 * Load an obj (populate the global symbol table, but don't resolve yet)
1390 * Returns: 1 if ok, 0 on error.
1393 loadObj( char *path )
1405 /* debugBelch("loadObj %s\n", path ); */
1407 /* Check that we haven't already loaded this object.
1408 Ignore requests to load multiple times */
1412 for (o = objects; o; o = o->next) {
1413 if (0 == strcmp(o->fileName, path)) {
1415 break; /* don't need to search further */
1419 IF_DEBUG(linker, debugBelch(
1420 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1421 "same object file twice:\n"
1423 "GHCi will ignore this, but be warned.\n"
1425 return 1; /* success */
1429 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1431 # if defined(OBJFORMAT_ELF)
1432 oc->formatName = "ELF";
1433 # elif defined(OBJFORMAT_PEi386)
1434 oc->formatName = "PEi386";
1435 # elif defined(OBJFORMAT_MACHO)
1436 oc->formatName = "Mach-O";
1439 barf("loadObj: not implemented on this platform");
1442 r = stat(path, &st);
1443 if (r == -1) { return 0; }
1445 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1446 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1447 strcpy(oc->fileName, path);
1449 oc->fileSize = st.st_size;
1451 oc->sections = NULL;
1452 oc->proddables = NULL;
1454 /* chain it onto the list of objects */
1459 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1461 #if defined(openbsd_HOST_OS)
1462 fd = open(path, O_RDONLY, S_IRUSR);
1464 fd = open(path, O_RDONLY);
1467 barf("loadObj: can't open `%s'", path);
1469 #ifdef ia64_HOST_ARCH
1470 /* The PLT needs to be right before the object */
1473 pagesize = getpagesize();
1474 n = ROUND_UP(PLTSize(), pagesize);
1475 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1476 if (oc->plt == MAP_FAILED)
1477 barf("loadObj: can't allocate PLT");
1480 map_addr = oc->plt + n;
1482 n = ROUND_UP(oc->fileSize, pagesize);
1483 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1484 MAP_PRIVATE|TRY_MAP_32BIT, fd, 0);
1485 if (oc->image == MAP_FAILED)
1486 barf("loadObj: can't map `%s'", path);
1489 oc->image = mmapForLinker(oc->fileSize, 0, fd);
1494 #else /* !USE_MMAP */
1495 /* load the image into memory */
1496 f = fopen(path, "rb");
1498 barf("loadObj: can't read `%s'", path);
1500 # if defined(mingw32_HOST_OS)
1501 // TODO: We would like to use allocateExec here, but allocateExec
1502 // cannot currently allocate blocks large enough.
1503 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1504 PAGE_EXECUTE_READWRITE);
1505 # elif defined(darwin_HOST_OS)
1506 // In a Mach-O .o file, all sections can and will be misaligned
1507 // if the total size of the headers is not a multiple of the
1508 // desired alignment. This is fine for .o files that only serve
1509 // as input for the static linker, but it's not fine for us,
1510 // as SSE (used by gcc for floating point) and Altivec require
1511 // 16-byte alignment.
1512 // We calculate the correct alignment from the header before
1513 // reading the file, and then we misalign oc->image on purpose so
1514 // that the actual sections end up aligned again.
1515 oc->misalignment = machoGetMisalignment(f);
1516 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1517 oc->image += oc->misalignment;
1519 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1524 n = fread ( oc->image, 1, oc->fileSize, f );
1525 if (n != oc->fileSize)
1526 barf("loadObj: error whilst reading `%s'", path);
1529 #endif /* USE_MMAP */
1531 # if defined(OBJFORMAT_MACHO) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1532 r = ocAllocateSymbolExtras_MachO ( oc );
1533 if (!r) { return r; }
1534 # elif defined(OBJFORMAT_ELF) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1535 r = ocAllocateSymbolExtras_ELF ( oc );
1536 if (!r) { return r; }
1539 /* verify the in-memory image */
1540 # if defined(OBJFORMAT_ELF)
1541 r = ocVerifyImage_ELF ( oc );
1542 # elif defined(OBJFORMAT_PEi386)
1543 r = ocVerifyImage_PEi386 ( oc );
1544 # elif defined(OBJFORMAT_MACHO)
1545 r = ocVerifyImage_MachO ( oc );
1547 barf("loadObj: no verify method");
1549 if (!r) { return r; }
1551 /* build the symbol list for this image */
1552 # if defined(OBJFORMAT_ELF)
1553 r = ocGetNames_ELF ( oc );
1554 # elif defined(OBJFORMAT_PEi386)
1555 r = ocGetNames_PEi386 ( oc );
1556 # elif defined(OBJFORMAT_MACHO)
1557 r = ocGetNames_MachO ( oc );
1559 barf("loadObj: no getNames method");
1561 if (!r) { return r; }
1563 /* loaded, but not resolved yet */
1564 oc->status = OBJECT_LOADED;
1569 /* -----------------------------------------------------------------------------
1570 * resolve all the currently unlinked objects in memory
1572 * Returns: 1 if ok, 0 on error.
1582 for (oc = objects; oc; oc = oc->next) {
1583 if (oc->status != OBJECT_RESOLVED) {
1584 # if defined(OBJFORMAT_ELF)
1585 r = ocResolve_ELF ( oc );
1586 # elif defined(OBJFORMAT_PEi386)
1587 r = ocResolve_PEi386 ( oc );
1588 # elif defined(OBJFORMAT_MACHO)
1589 r = ocResolve_MachO ( oc );
1591 barf("resolveObjs: not implemented on this platform");
1593 if (!r) { return r; }
1594 oc->status = OBJECT_RESOLVED;
1600 /* -----------------------------------------------------------------------------
1601 * delete an object from the pool
1604 unloadObj( char *path )
1606 ObjectCode *oc, *prev;
1608 ASSERT(symhash != NULL);
1609 ASSERT(objects != NULL);
1614 for (oc = objects; oc; prev = oc, oc = oc->next) {
1615 if (!strcmp(oc->fileName,path)) {
1617 /* Remove all the mappings for the symbols within this
1622 for (i = 0; i < oc->n_symbols; i++) {
1623 if (oc->symbols[i] != NULL) {
1624 removeStrHashTable(symhash, oc->symbols[i], NULL);
1632 prev->next = oc->next;
1635 // We're going to leave this in place, in case there are
1636 // any pointers from the heap into it:
1637 // #ifdef mingw32_HOST_OS
1638 // VirtualFree(oc->image);
1640 // stgFree(oc->image);
1642 stgFree(oc->fileName);
1643 stgFree(oc->symbols);
1644 stgFree(oc->sections);
1650 errorBelch("unloadObj: can't find `%s' to unload", path);
1654 /* -----------------------------------------------------------------------------
1655 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1656 * which may be prodded during relocation, and abort if we try and write
1657 * outside any of these.
1659 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1662 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1663 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1667 pb->next = oc->proddables;
1668 oc->proddables = pb;
1671 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1674 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1675 char* s = (char*)(pb->start);
1676 char* e = s + pb->size - 1;
1677 char* a = (char*)addr;
1678 /* Assumes that the biggest fixup involves a 4-byte write. This
1679 probably needs to be changed to 8 (ie, +7) on 64-bit
1681 if (a >= s && (a+3) <= e) return;
1683 barf("checkProddableBlock: invalid fixup in runtime linker");
1686 /* -----------------------------------------------------------------------------
1687 * Section management.
1689 static void addSection ( ObjectCode* oc, SectionKind kind,
1690 void* start, void* end )
1692 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1696 s->next = oc->sections;
1699 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1700 start, ((char*)end)-1, end - start + 1, kind );
1705 /* --------------------------------------------------------------------------
1707 * This is about allocating a small chunk of memory for every symbol in the
1708 * object file. We make sure that the SymboLExtras are always "in range" of
1709 * limited-range PC-relative instructions on various platforms by allocating
1710 * them right next to the object code itself.
1713 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
1716 ocAllocateSymbolExtras
1718 Allocate additional space at the end of the object file image to make room
1719 for jump islands (powerpc, x86_64) and GOT entries (x86_64).
1721 PowerPC relative branch instructions have a 24 bit displacement field.
1722 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1723 If a particular imported symbol is outside this range, we have to redirect
1724 the jump to a short piece of new code that just loads the 32bit absolute
1725 address and jumps there.
1726 On x86_64, PC-relative jumps and PC-relative accesses to the GOT are limited
1729 This function just allocates space for one SymbolExtra for every
1730 undefined symbol in the object file. The code for the jump islands is
1731 filled in by makeSymbolExtra below.
1734 static int ocAllocateSymbolExtras( ObjectCode* oc, int count, int first )
1741 int misalignment = 0;
1742 #ifdef darwin_HOST_OS
1743 misalignment = oc->misalignment;
1749 // round up to the nearest 4
1750 aligned = (oc->fileSize + 3) & ~3;
1753 pagesize = getpagesize();
1754 n = ROUND_UP( oc->fileSize, pagesize );
1755 m = ROUND_UP( aligned + sizeof (SymbolExtra) * count, pagesize );
1757 /* we try to use spare space at the end of the last page of the
1758 * image for the jump islands, but if there isn't enough space
1759 * then we have to map some (anonymously, remembering MAP_32BIT).
1761 if( m > n ) // we need to allocate more pages
1763 oc->symbol_extras = mmapForLinker(sizeof(SymbolExtra) * count,
1768 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1771 oc->image -= misalignment;
1772 oc->image = stgReallocBytes( oc->image,
1774 aligned + sizeof (SymbolExtra) * count,
1775 "ocAllocateSymbolExtras" );
1776 oc->image += misalignment;
1778 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1779 #endif /* USE_MMAP */
1781 memset( oc->symbol_extras, 0, sizeof (SymbolExtra) * count );
1784 oc->symbol_extras = NULL;
1786 oc->first_symbol_extra = first;
1787 oc->n_symbol_extras = count;
1792 static SymbolExtra* makeSymbolExtra( ObjectCode* oc,
1793 unsigned long symbolNumber,
1794 unsigned long target )
1798 ASSERT( symbolNumber >= oc->first_symbol_extra
1799 && symbolNumber - oc->first_symbol_extra < oc->n_symbol_extras);
1801 extra = &oc->symbol_extras[symbolNumber - oc->first_symbol_extra];
1803 #ifdef powerpc_HOST_ARCH
1804 // lis r12, hi16(target)
1805 extra->jumpIsland.lis_r12 = 0x3d80;
1806 extra->jumpIsland.hi_addr = target >> 16;
1808 // ori r12, r12, lo16(target)
1809 extra->jumpIsland.ori_r12_r12 = 0x618c;
1810 extra->jumpIsland.lo_addr = target & 0xffff;
1813 extra->jumpIsland.mtctr_r12 = 0x7d8903a6;
1816 extra->jumpIsland.bctr = 0x4e800420;
1818 #ifdef x86_64_HOST_ARCH
1820 static uint8_t jmp[] = { 0xFF, 0x25, 0xF2, 0xFF, 0xFF, 0xFF };
1821 extra->addr = target;
1822 memcpy(extra->jumpIsland, jmp, 6);
1830 /* --------------------------------------------------------------------------
1831 * PowerPC specifics (instruction cache flushing)
1832 * ------------------------------------------------------------------------*/
1834 #ifdef powerpc_TARGET_ARCH
1836 ocFlushInstructionCache
1838 Flush the data & instruction caches.
1839 Because the PPC has split data/instruction caches, we have to
1840 do that whenever we modify code at runtime.
1843 static void ocFlushInstructionCache( ObjectCode *oc )
1845 int n = (oc->fileSize + sizeof( SymbolExtra ) * oc->n_symbol_extras + 3) / 4;
1846 unsigned long *p = (unsigned long *) oc->image;
1850 __asm__ volatile ( "dcbf 0,%0\n\t"
1858 __asm__ volatile ( "sync\n\t"
1864 /* --------------------------------------------------------------------------
1865 * PEi386 specifics (Win32 targets)
1866 * ------------------------------------------------------------------------*/
1868 /* The information for this linker comes from
1869 Microsoft Portable Executable
1870 and Common Object File Format Specification
1871 revision 5.1 January 1998
1872 which SimonM says comes from the MS Developer Network CDs.
1874 It can be found there (on older CDs), but can also be found
1877 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1879 (this is Rev 6.0 from February 1999).
1881 Things move, so if that fails, try searching for it via
1883 http://www.google.com/search?q=PE+COFF+specification
1885 The ultimate reference for the PE format is the Winnt.h
1886 header file that comes with the Platform SDKs; as always,
1887 implementations will drift wrt their documentation.
1889 A good background article on the PE format is Matt Pietrek's
1890 March 1994 article in Microsoft System Journal (MSJ)
1891 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1892 Win32 Portable Executable File Format." The info in there
1893 has recently been updated in a two part article in
1894 MSDN magazine, issues Feb and March 2002,
1895 "Inside Windows: An In-Depth Look into the Win32 Portable
1896 Executable File Format"
1898 John Levine's book "Linkers and Loaders" contains useful
1903 #if defined(OBJFORMAT_PEi386)
1907 typedef unsigned char UChar;
1908 typedef unsigned short UInt16;
1909 typedef unsigned int UInt32;
1916 UInt16 NumberOfSections;
1917 UInt32 TimeDateStamp;
1918 UInt32 PointerToSymbolTable;
1919 UInt32 NumberOfSymbols;
1920 UInt16 SizeOfOptionalHeader;
1921 UInt16 Characteristics;
1925 #define sizeof_COFF_header 20
1932 UInt32 VirtualAddress;
1933 UInt32 SizeOfRawData;
1934 UInt32 PointerToRawData;
1935 UInt32 PointerToRelocations;
1936 UInt32 PointerToLinenumbers;
1937 UInt16 NumberOfRelocations;
1938 UInt16 NumberOfLineNumbers;
1939 UInt32 Characteristics;
1943 #define sizeof_COFF_section 40
1950 UInt16 SectionNumber;
1953 UChar NumberOfAuxSymbols;
1957 #define sizeof_COFF_symbol 18
1962 UInt32 VirtualAddress;
1963 UInt32 SymbolTableIndex;
1968 #define sizeof_COFF_reloc 10
1971 /* From PE spec doc, section 3.3.2 */
1972 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1973 windows.h -- for the same purpose, but I want to know what I'm
1975 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1976 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1977 #define MYIMAGE_FILE_DLL 0x2000
1978 #define MYIMAGE_FILE_SYSTEM 0x1000
1979 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1980 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1981 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1983 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1984 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1985 #define MYIMAGE_SYM_CLASS_STATIC 3
1986 #define MYIMAGE_SYM_UNDEFINED 0
1988 /* From PE spec doc, section 4.1 */
1989 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1990 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1991 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1993 /* From PE spec doc, section 5.2.1 */
1994 #define MYIMAGE_REL_I386_DIR32 0x0006
1995 #define MYIMAGE_REL_I386_REL32 0x0014
1998 /* We use myindex to calculate array addresses, rather than
1999 simply doing the normal subscript thing. That's because
2000 some of the above structs have sizes which are not
2001 a whole number of words. GCC rounds their sizes up to a
2002 whole number of words, which means that the address calcs
2003 arising from using normal C indexing or pointer arithmetic
2004 are just plain wrong. Sigh.
2007 myindex ( int scale, void* base, int index )
2010 ((UChar*)base) + scale * index;
2015 printName ( UChar* name, UChar* strtab )
2017 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2018 UInt32 strtab_offset = * (UInt32*)(name+4);
2019 debugBelch("%s", strtab + strtab_offset );
2022 for (i = 0; i < 8; i++) {
2023 if (name[i] == 0) break;
2024 debugBelch("%c", name[i] );
2031 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
2033 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2034 UInt32 strtab_offset = * (UInt32*)(name+4);
2035 strncpy ( dst, strtab+strtab_offset, dstSize );
2041 if (name[i] == 0) break;
2051 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
2054 /* If the string is longer than 8 bytes, look in the
2055 string table for it -- this will be correctly zero terminated.
2057 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2058 UInt32 strtab_offset = * (UInt32*)(name+4);
2059 return ((UChar*)strtab) + strtab_offset;
2061 /* Otherwise, if shorter than 8 bytes, return the original,
2062 which by defn is correctly terminated.
2064 if (name[7]==0) return name;
2065 /* The annoying case: 8 bytes. Copy into a temporary
2066 (which is never freed ...)
2068 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
2070 strncpy(newstr,name,8);
2076 /* Just compares the short names (first 8 chars) */
2077 static COFF_section *
2078 findPEi386SectionCalled ( ObjectCode* oc, char* name )
2082 = (COFF_header*)(oc->image);
2083 COFF_section* sectab
2085 ((UChar*)(oc->image))
2086 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2088 for (i = 0; i < hdr->NumberOfSections; i++) {
2091 COFF_section* section_i
2093 myindex ( sizeof_COFF_section, sectab, i );
2094 n1 = (UChar*) &(section_i->Name);
2096 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
2097 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
2098 n1[6]==n2[6] && n1[7]==n2[7])
2107 zapTrailingAtSign ( UChar* sym )
2109 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
2111 if (sym[0] == 0) return;
2113 while (sym[i] != 0) i++;
2116 while (j > 0 && my_isdigit(sym[j])) j--;
2117 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
2122 lookupSymbolInDLLs ( UChar *lbl )
2127 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
2128 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
2130 if (lbl[0] == '_') {
2131 /* HACK: if the name has an initial underscore, try stripping
2132 it off & look that up first. I've yet to verify whether there's
2133 a Rule that governs whether an initial '_' *should always* be
2134 stripped off when mapping from import lib name to the DLL name.
2136 sym = GetProcAddress(o_dll->instance, (lbl+1));
2138 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
2142 sym = GetProcAddress(o_dll->instance, lbl);
2144 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
2153 ocVerifyImage_PEi386 ( ObjectCode* oc )
2158 COFF_section* sectab;
2159 COFF_symbol* symtab;
2161 /* debugBelch("\nLOADING %s\n", oc->fileName); */
2162 hdr = (COFF_header*)(oc->image);
2163 sectab = (COFF_section*) (
2164 ((UChar*)(oc->image))
2165 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2167 symtab = (COFF_symbol*) (
2168 ((UChar*)(oc->image))
2169 + hdr->PointerToSymbolTable
2171 strtab = ((UChar*)symtab)
2172 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2174 if (hdr->Machine != 0x14c) {
2175 errorBelch("%s: Not x86 PEi386", oc->fileName);
2178 if (hdr->SizeOfOptionalHeader != 0) {
2179 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2182 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2183 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2184 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2185 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2186 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2189 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2190 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2191 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2193 (int)(hdr->Characteristics));
2196 /* If the string table size is way crazy, this might indicate that
2197 there are more than 64k relocations, despite claims to the
2198 contrary. Hence this test. */
2199 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2201 if ( (*(UInt32*)strtab) > 600000 ) {
2202 /* Note that 600k has no special significance other than being
2203 big enough to handle the almost-2MB-sized lumps that
2204 constitute HSwin32*.o. */
2205 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2210 /* No further verification after this point; only debug printing. */
2212 IF_DEBUG(linker, i=1);
2213 if (i == 0) return 1;
2215 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2216 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2217 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2220 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2221 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2222 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2223 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2224 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2225 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2226 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2228 /* Print the section table. */
2230 for (i = 0; i < hdr->NumberOfSections; i++) {
2232 COFF_section* sectab_i
2234 myindex ( sizeof_COFF_section, sectab, i );
2241 printName ( sectab_i->Name, strtab );
2251 sectab_i->VirtualSize,
2252 sectab_i->VirtualAddress,
2253 sectab_i->SizeOfRawData,
2254 sectab_i->PointerToRawData,
2255 sectab_i->NumberOfRelocations,
2256 sectab_i->PointerToRelocations,
2257 sectab_i->PointerToRawData
2259 reltab = (COFF_reloc*) (
2260 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2263 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2264 /* If the relocation field (a short) has overflowed, the
2265 * real count can be found in the first reloc entry.
2267 * See Section 4.1 (last para) of the PE spec (rev6.0).
2269 COFF_reloc* rel = (COFF_reloc*)
2270 myindex ( sizeof_COFF_reloc, reltab, 0 );
2271 noRelocs = rel->VirtualAddress;
2274 noRelocs = sectab_i->NumberOfRelocations;
2278 for (; j < noRelocs; j++) {
2280 COFF_reloc* rel = (COFF_reloc*)
2281 myindex ( sizeof_COFF_reloc, reltab, j );
2283 " type 0x%-4x vaddr 0x%-8x name `",
2285 rel->VirtualAddress );
2286 sym = (COFF_symbol*)
2287 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2288 /* Hmm..mysterious looking offset - what's it for? SOF */
2289 printName ( sym->Name, strtab -10 );
2296 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2297 debugBelch("---START of string table---\n");
2298 for (i = 4; i < *(Int32*)strtab; i++) {
2300 debugBelch("\n"); else
2301 debugBelch("%c", strtab[i] );
2303 debugBelch("--- END of string table---\n");
2308 COFF_symbol* symtab_i;
2309 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2310 symtab_i = (COFF_symbol*)
2311 myindex ( sizeof_COFF_symbol, symtab, i );
2317 printName ( symtab_i->Name, strtab );
2326 (Int32)(symtab_i->SectionNumber),
2327 (UInt32)symtab_i->Type,
2328 (UInt32)symtab_i->StorageClass,
2329 (UInt32)symtab_i->NumberOfAuxSymbols
2331 i += symtab_i->NumberOfAuxSymbols;
2341 ocGetNames_PEi386 ( ObjectCode* oc )
2344 COFF_section* sectab;
2345 COFF_symbol* symtab;
2352 hdr = (COFF_header*)(oc->image);
2353 sectab = (COFF_section*) (
2354 ((UChar*)(oc->image))
2355 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2357 symtab = (COFF_symbol*) (
2358 ((UChar*)(oc->image))
2359 + hdr->PointerToSymbolTable
2361 strtab = ((UChar*)(oc->image))
2362 + hdr->PointerToSymbolTable
2363 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2365 /* Allocate space for any (local, anonymous) .bss sections. */
2367 for (i = 0; i < hdr->NumberOfSections; i++) {
2370 COFF_section* sectab_i
2372 myindex ( sizeof_COFF_section, sectab, i );
2373 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2374 /* sof 10/05: the PE spec text isn't too clear regarding what
2375 * the SizeOfRawData field is supposed to hold for object
2376 * file sections containing just uninitialized data -- for executables,
2377 * it is supposed to be zero; unclear what it's supposed to be
2378 * for object files. However, VirtualSize is guaranteed to be
2379 * zero for object files, which definitely suggests that SizeOfRawData
2380 * will be non-zero (where else would the size of this .bss section be
2381 * stored?) Looking at the COFF_section info for incoming object files,
2382 * this certainly appears to be the case.
2384 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2385 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2386 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2387 * variable decls into to the .bss section. (The specific function in Q which
2388 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2390 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2391 /* This is a non-empty .bss section. Allocate zeroed space for
2392 it, and set its PointerToRawData field such that oc->image +
2393 PointerToRawData == addr_of_zeroed_space. */
2394 bss_sz = sectab_i->VirtualSize;
2395 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2396 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2397 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2398 addProddableBlock(oc, zspace, bss_sz);
2399 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2402 /* Copy section information into the ObjectCode. */
2404 for (i = 0; i < hdr->NumberOfSections; i++) {
2410 = SECTIONKIND_OTHER;
2411 COFF_section* sectab_i
2413 myindex ( sizeof_COFF_section, sectab, i );
2414 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2417 /* I'm sure this is the Right Way to do it. However, the
2418 alternative of testing the sectab_i->Name field seems to
2419 work ok with Cygwin.
2421 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2422 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2423 kind = SECTIONKIND_CODE_OR_RODATA;
2426 if (0==strcmp(".text",sectab_i->Name) ||
2427 0==strcmp(".rdata",sectab_i->Name)||
2428 0==strcmp(".rodata",sectab_i->Name))
2429 kind = SECTIONKIND_CODE_OR_RODATA;
2430 if (0==strcmp(".data",sectab_i->Name) ||
2431 0==strcmp(".bss",sectab_i->Name))
2432 kind = SECTIONKIND_RWDATA;
2434 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2435 sz = sectab_i->SizeOfRawData;
2436 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2438 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2439 end = start + sz - 1;
2441 if (kind == SECTIONKIND_OTHER
2442 /* Ignore sections called which contain stabs debugging
2444 && 0 != strcmp(".stab", sectab_i->Name)
2445 && 0 != strcmp(".stabstr", sectab_i->Name)
2446 /* ignore constructor section for now */
2447 && 0 != strcmp(".ctors", sectab_i->Name)
2448 /* ignore section generated from .ident */
2449 && 0!= strcmp("/4", sectab_i->Name)
2450 /* ignore unknown section that appeared in gcc 3.4.5(?) */
2451 && 0!= strcmp(".reloc", sectab_i->Name)
2453 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2457 if (kind != SECTIONKIND_OTHER && end >= start) {
2458 addSection(oc, kind, start, end);
2459 addProddableBlock(oc, start, end - start + 1);
2463 /* Copy exported symbols into the ObjectCode. */
2465 oc->n_symbols = hdr->NumberOfSymbols;
2466 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2467 "ocGetNames_PEi386(oc->symbols)");
2468 /* Call me paranoid; I don't care. */
2469 for (i = 0; i < oc->n_symbols; i++)
2470 oc->symbols[i] = NULL;
2474 COFF_symbol* symtab_i;
2475 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2476 symtab_i = (COFF_symbol*)
2477 myindex ( sizeof_COFF_symbol, symtab, i );
2481 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2482 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2483 /* This symbol is global and defined, viz, exported */
2484 /* for MYIMAGE_SYMCLASS_EXTERNAL
2485 && !MYIMAGE_SYM_UNDEFINED,
2486 the address of the symbol is:
2487 address of relevant section + offset in section
2489 COFF_section* sectabent
2490 = (COFF_section*) myindex ( sizeof_COFF_section,
2492 symtab_i->SectionNumber-1 );
2493 addr = ((UChar*)(oc->image))
2494 + (sectabent->PointerToRawData
2498 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2499 && symtab_i->Value > 0) {
2500 /* This symbol isn't in any section at all, ie, global bss.
2501 Allocate zeroed space for it. */
2502 addr = stgCallocBytes(1, symtab_i->Value,
2503 "ocGetNames_PEi386(non-anonymous bss)");
2504 addSection(oc, SECTIONKIND_RWDATA, addr,
2505 ((UChar*)addr) + symtab_i->Value - 1);
2506 addProddableBlock(oc, addr, symtab_i->Value);
2507 /* debugBelch("BSS section at 0x%x\n", addr); */
2510 if (addr != NULL ) {
2511 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2512 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2513 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2514 ASSERT(i >= 0 && i < oc->n_symbols);
2515 /* cstring_from_COFF_symbol_name always succeeds. */
2516 oc->symbols[i] = sname;
2517 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2521 "IGNORING symbol %d\n"
2525 printName ( symtab_i->Name, strtab );
2534 (Int32)(symtab_i->SectionNumber),
2535 (UInt32)symtab_i->Type,
2536 (UInt32)symtab_i->StorageClass,
2537 (UInt32)symtab_i->NumberOfAuxSymbols
2542 i += symtab_i->NumberOfAuxSymbols;
2551 ocResolve_PEi386 ( ObjectCode* oc )
2554 COFF_section* sectab;
2555 COFF_symbol* symtab;
2565 /* ToDo: should be variable-sized? But is at least safe in the
2566 sense of buffer-overrun-proof. */
2568 /* debugBelch("resolving for %s\n", oc->fileName); */
2570 hdr = (COFF_header*)(oc->image);
2571 sectab = (COFF_section*) (
2572 ((UChar*)(oc->image))
2573 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2575 symtab = (COFF_symbol*) (
2576 ((UChar*)(oc->image))
2577 + hdr->PointerToSymbolTable
2579 strtab = ((UChar*)(oc->image))
2580 + hdr->PointerToSymbolTable
2581 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2583 for (i = 0; i < hdr->NumberOfSections; i++) {
2584 COFF_section* sectab_i
2586 myindex ( sizeof_COFF_section, sectab, i );
2589 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2592 /* Ignore sections called which contain stabs debugging
2594 if (0 == strcmp(".stab", sectab_i->Name)
2595 || 0 == strcmp(".stabstr", sectab_i->Name)
2596 || 0 == strcmp(".ctors", sectab_i->Name))
2599 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2600 /* If the relocation field (a short) has overflowed, the
2601 * real count can be found in the first reloc entry.
2603 * See Section 4.1 (last para) of the PE spec (rev6.0).
2605 * Nov2003 update: the GNU linker still doesn't correctly
2606 * handle the generation of relocatable object files with
2607 * overflown relocations. Hence the output to warn of potential
2610 COFF_reloc* rel = (COFF_reloc*)
2611 myindex ( sizeof_COFF_reloc, reltab, 0 );
2612 noRelocs = rel->VirtualAddress;
2614 /* 10/05: we now assume (and check for) a GNU ld that is capable
2615 * of handling object files with (>2^16) of relocs.
2618 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2623 noRelocs = sectab_i->NumberOfRelocations;
2628 for (; j < noRelocs; j++) {
2630 COFF_reloc* reltab_j
2632 myindex ( sizeof_COFF_reloc, reltab, j );
2634 /* the location to patch */
2636 ((UChar*)(oc->image))
2637 + (sectab_i->PointerToRawData
2638 + reltab_j->VirtualAddress
2639 - sectab_i->VirtualAddress )
2641 /* the existing contents of pP */
2643 /* the symbol to connect to */
2644 sym = (COFF_symbol*)
2645 myindex ( sizeof_COFF_symbol,
2646 symtab, reltab_j->SymbolTableIndex );
2649 "reloc sec %2d num %3d: type 0x%-4x "
2650 "vaddr 0x%-8x name `",
2652 (UInt32)reltab_j->Type,
2653 reltab_j->VirtualAddress );
2654 printName ( sym->Name, strtab );
2655 debugBelch("'\n" ));
2657 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2658 COFF_section* section_sym
2659 = findPEi386SectionCalled ( oc, sym->Name );
2661 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2664 S = ((UInt32)(oc->image))
2665 + (section_sym->PointerToRawData
2668 copyName ( sym->Name, strtab, symbol, 1000-1 );
2669 S = (UInt32) lookupSymbol( symbol );
2670 if ((void*)S != NULL) goto foundit;
2671 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
2675 checkProddableBlock(oc, pP);
2676 switch (reltab_j->Type) {
2677 case MYIMAGE_REL_I386_DIR32:
2680 case MYIMAGE_REL_I386_REL32:
2681 /* Tricky. We have to insert a displacement at
2682 pP which, when added to the PC for the _next_
2683 insn, gives the address of the target (S).
2684 Problem is to know the address of the next insn
2685 when we only know pP. We assume that this
2686 literal field is always the last in the insn,
2687 so that the address of the next insn is pP+4
2688 -- hence the constant 4.
2689 Also I don't know if A should be added, but so
2690 far it has always been zero.
2692 SOF 05/2005: 'A' (old contents of *pP) have been observed
2693 to contain values other than zero (the 'wx' object file
2694 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2695 So, add displacement to old value instead of asserting
2696 A to be zero. Fixes wxhaskell-related crashes, and no other
2697 ill effects have been observed.
2699 Update: the reason why we're seeing these more elaborate
2700 relocations is due to a switch in how the NCG compiles SRTs
2701 and offsets to them from info tables. SRTs live in .(ro)data,
2702 while info tables live in .text, causing GAS to emit REL32/DISP32
2703 relocations with non-zero values. Adding the displacement is
2704 the right thing to do.
2706 *pP = S - ((UInt32)pP) - 4 + A;
2709 debugBelch("%s: unhandled PEi386 relocation type %d",
2710 oc->fileName, reltab_j->Type);
2717 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2721 #endif /* defined(OBJFORMAT_PEi386) */
2724 /* --------------------------------------------------------------------------
2726 * ------------------------------------------------------------------------*/
2728 #if defined(OBJFORMAT_ELF)
2733 #if defined(sparc_HOST_ARCH)
2734 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2735 #elif defined(i386_HOST_ARCH)
2736 # define ELF_TARGET_386 /* Used inside <elf.h> */
2737 #elif defined(x86_64_HOST_ARCH)
2738 # define ELF_TARGET_X64_64
2740 #elif defined (ia64_HOST_ARCH)
2741 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2743 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2744 # define ELF_NEED_GOT /* needs Global Offset Table */
2745 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2748 #if !defined(openbsd_HOST_OS)
2751 /* openbsd elf has things in different places, with diff names */
2752 # include <elf_abi.h>
2753 # include <machine/reloc.h>
2754 # define R_386_32 RELOC_32
2755 # define R_386_PC32 RELOC_PC32
2758 /* If elf.h doesn't define it */
2759 # ifndef R_X86_64_PC64
2760 # define R_X86_64_PC64 24
2764 * Define a set of types which can be used for both ELF32 and ELF64
2768 #define ELFCLASS ELFCLASS64
2769 #define Elf_Addr Elf64_Addr
2770 #define Elf_Word Elf64_Word
2771 #define Elf_Sword Elf64_Sword
2772 #define Elf_Ehdr Elf64_Ehdr
2773 #define Elf_Phdr Elf64_Phdr
2774 #define Elf_Shdr Elf64_Shdr
2775 #define Elf_Sym Elf64_Sym
2776 #define Elf_Rel Elf64_Rel
2777 #define Elf_Rela Elf64_Rela
2778 #define ELF_ST_TYPE ELF64_ST_TYPE
2779 #define ELF_ST_BIND ELF64_ST_BIND
2780 #define ELF_R_TYPE ELF64_R_TYPE
2781 #define ELF_R_SYM ELF64_R_SYM
2783 #define ELFCLASS ELFCLASS32
2784 #define Elf_Addr Elf32_Addr
2785 #define Elf_Word Elf32_Word
2786 #define Elf_Sword Elf32_Sword
2787 #define Elf_Ehdr Elf32_Ehdr
2788 #define Elf_Phdr Elf32_Phdr
2789 #define Elf_Shdr Elf32_Shdr
2790 #define Elf_Sym Elf32_Sym
2791 #define Elf_Rel Elf32_Rel
2792 #define Elf_Rela Elf32_Rela
2794 #define ELF_ST_TYPE ELF32_ST_TYPE
2797 #define ELF_ST_BIND ELF32_ST_BIND
2800 #define ELF_R_TYPE ELF32_R_TYPE
2803 #define ELF_R_SYM ELF32_R_SYM
2809 * Functions to allocate entries in dynamic sections. Currently we simply
2810 * preallocate a large number, and we don't check if a entry for the given
2811 * target already exists (a linear search is too slow). Ideally these
2812 * entries would be associated with symbols.
2815 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2816 #define GOT_SIZE 0x20000
2817 #define FUNCTION_TABLE_SIZE 0x10000
2818 #define PLT_SIZE 0x08000
2821 static Elf_Addr got[GOT_SIZE];
2822 static unsigned int gotIndex;
2823 static Elf_Addr gp_val = (Elf_Addr)got;
2826 allocateGOTEntry(Elf_Addr target)
2830 if (gotIndex >= GOT_SIZE)
2831 barf("Global offset table overflow");
2833 entry = &got[gotIndex++];
2835 return (Elf_Addr)entry;
2839 #ifdef ELF_FUNCTION_DESC
2845 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2846 static unsigned int functionTableIndex;
2849 allocateFunctionDesc(Elf_Addr target)
2851 FunctionDesc *entry;
2853 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2854 barf("Function table overflow");
2856 entry = &functionTable[functionTableIndex++];
2858 entry->gp = (Elf_Addr)gp_val;
2859 return (Elf_Addr)entry;
2863 copyFunctionDesc(Elf_Addr target)
2865 FunctionDesc *olddesc = (FunctionDesc *)target;
2866 FunctionDesc *newdesc;
2868 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2869 newdesc->gp = olddesc->gp;
2870 return (Elf_Addr)newdesc;
2875 #ifdef ia64_HOST_ARCH
2876 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2877 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2879 static unsigned char plt_code[] =
2881 /* taken from binutils bfd/elfxx-ia64.c */
2882 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2883 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2884 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2885 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2886 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2887 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2890 /* If we can't get to the function descriptor via gp, take a local copy of it */
2891 #define PLT_RELOC(code, target) { \
2892 Elf64_Sxword rel_value = target - gp_val; \
2893 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2894 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2896 ia64_reloc_gprel22((Elf_Addr)code, target); \
2901 unsigned char code[sizeof(plt_code)];
2905 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2907 PLTEntry *plt = (PLTEntry *)oc->plt;
2910 if (oc->pltIndex >= PLT_SIZE)
2911 barf("Procedure table overflow");
2913 entry = &plt[oc->pltIndex++];
2914 memcpy(entry->code, plt_code, sizeof(entry->code));
2915 PLT_RELOC(entry->code, target);
2916 return (Elf_Addr)entry;
2922 return (PLT_SIZE * sizeof(PLTEntry));
2928 * Generic ELF functions
2932 findElfSection ( void* objImage, Elf_Word sh_type )
2934 char* ehdrC = (char*)objImage;
2935 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2936 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2937 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2941 for (i = 0; i < ehdr->e_shnum; i++) {
2942 if (shdr[i].sh_type == sh_type
2943 /* Ignore the section header's string table. */
2944 && i != ehdr->e_shstrndx
2945 /* Ignore string tables named .stabstr, as they contain
2947 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2949 ptr = ehdrC + shdr[i].sh_offset;
2956 #if defined(ia64_HOST_ARCH)
2958 findElfSegment ( void* objImage, Elf_Addr vaddr )
2960 char* ehdrC = (char*)objImage;
2961 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2962 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2963 Elf_Addr segaddr = 0;
2966 for (i = 0; i < ehdr->e_phnum; i++) {
2967 segaddr = phdr[i].p_vaddr;
2968 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2976 ocVerifyImage_ELF ( ObjectCode* oc )
2980 int i, j, nent, nstrtab, nsymtabs;
2984 char* ehdrC = (char*)(oc->image);
2985 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2987 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2988 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2989 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2990 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2991 errorBelch("%s: not an ELF object", oc->fileName);
2995 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2996 errorBelch("%s: unsupported ELF format", oc->fileName);
3000 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
3001 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
3003 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
3004 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
3006 errorBelch("%s: unknown endiannness", oc->fileName);
3010 if (ehdr->e_type != ET_REL) {
3011 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
3014 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
3016 IF_DEBUG(linker,debugBelch( "Architecture is " ));
3017 switch (ehdr->e_machine) {
3018 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
3019 #ifdef EM_SPARC32PLUS
3020 case EM_SPARC32PLUS:
3022 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
3024 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
3026 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
3028 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
3029 #elif defined(EM_AMD64)
3030 case EM_AMD64: IF_DEBUG(linker,debugBelch( "amd64" )); break;
3032 default: IF_DEBUG(linker,debugBelch( "unknown" ));
3033 errorBelch("%s: unknown architecture (e_machine == %d)"
3034 , oc->fileName, ehdr->e_machine);
3038 IF_DEBUG(linker,debugBelch(
3039 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
3040 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
3042 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
3044 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3046 if (ehdr->e_shstrndx == SHN_UNDEF) {
3047 errorBelch("%s: no section header string table", oc->fileName);
3050 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
3052 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
3055 for (i = 0; i < ehdr->e_shnum; i++) {
3056 IF_DEBUG(linker,debugBelch("%2d: ", i ));
3057 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
3058 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
3059 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
3060 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
3061 ehdrC + shdr[i].sh_offset,
3062 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
3064 if (shdr[i].sh_type == SHT_REL) {
3065 IF_DEBUG(linker,debugBelch("Rel " ));
3066 } else if (shdr[i].sh_type == SHT_RELA) {
3067 IF_DEBUG(linker,debugBelch("RelA " ));
3069 IF_DEBUG(linker,debugBelch(" "));
3072 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
3076 IF_DEBUG(linker,debugBelch( "\nString tables" ));
3079 for (i = 0; i < ehdr->e_shnum; i++) {
3080 if (shdr[i].sh_type == SHT_STRTAB
3081 /* Ignore the section header's string table. */
3082 && i != ehdr->e_shstrndx
3083 /* Ignore string tables named .stabstr, as they contain
3085 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
3087 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
3088 strtab = ehdrC + shdr[i].sh_offset;
3093 errorBelch("%s: no string tables, or too many", oc->fileName);
3098 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
3099 for (i = 0; i < ehdr->e_shnum; i++) {
3100 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3101 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
3103 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3104 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3105 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
3107 (long)shdr[i].sh_size % sizeof(Elf_Sym)
3109 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
3110 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
3113 for (j = 0; j < nent; j++) {
3114 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3115 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3116 (int)stab[j].st_shndx,
3117 (int)stab[j].st_size,
3118 (char*)stab[j].st_value ));
3120 IF_DEBUG(linker,debugBelch("type=" ));
3121 switch (ELF_ST_TYPE(stab[j].st_info)) {
3122 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3123 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3124 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3125 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3126 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3127 default: IF_DEBUG(linker,debugBelch("? " )); break;
3129 IF_DEBUG(linker,debugBelch(" " ));
3131 IF_DEBUG(linker,debugBelch("bind=" ));
3132 switch (ELF_ST_BIND(stab[j].st_info)) {
3133 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3134 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3135 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3136 default: IF_DEBUG(linker,debugBelch("? " )); break;
3138 IF_DEBUG(linker,debugBelch(" " ));
3140 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3144 if (nsymtabs == 0) {
3145 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3152 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3156 if (hdr->sh_type == SHT_PROGBITS
3157 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3158 /* .text-style section */
3159 return SECTIONKIND_CODE_OR_RODATA;
3162 if (hdr->sh_type == SHT_PROGBITS
3163 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3164 /* .data-style section */
3165 return SECTIONKIND_RWDATA;
3168 if (hdr->sh_type == SHT_PROGBITS
3169 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3170 /* .rodata-style section */
3171 return SECTIONKIND_CODE_OR_RODATA;
3174 if (hdr->sh_type == SHT_NOBITS
3175 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3176 /* .bss-style section */
3178 return SECTIONKIND_RWDATA;
3181 return SECTIONKIND_OTHER;
3186 ocGetNames_ELF ( ObjectCode* oc )
3191 char* ehdrC = (char*)(oc->image);
3192 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3193 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3194 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3196 ASSERT(symhash != NULL);
3199 errorBelch("%s: no strtab", oc->fileName);
3204 for (i = 0; i < ehdr->e_shnum; i++) {
3205 /* Figure out what kind of section it is. Logic derived from
3206 Figure 1.14 ("Special Sections") of the ELF document
3207 ("Portable Formats Specification, Version 1.1"). */
3209 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3211 if (is_bss && shdr[i].sh_size > 0) {
3212 /* This is a non-empty .bss section. Allocate zeroed space for
3213 it, and set its .sh_offset field such that
3214 ehdrC + .sh_offset == addr_of_zeroed_space. */
3215 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3216 "ocGetNames_ELF(BSS)");
3217 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3219 debugBelch("BSS section at 0x%x, size %d\n",
3220 zspace, shdr[i].sh_size);
3224 /* fill in the section info */
3225 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3226 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3227 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3228 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3231 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3233 /* copy stuff into this module's object symbol table */
3234 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3235 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3237 oc->n_symbols = nent;
3238 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3239 "ocGetNames_ELF(oc->symbols)");
3241 for (j = 0; j < nent; j++) {
3243 char isLocal = FALSE; /* avoids uninit-var warning */
3245 char* nm = strtab + stab[j].st_name;
3246 int secno = stab[j].st_shndx;
3248 /* Figure out if we want to add it; if so, set ad to its
3249 address. Otherwise leave ad == NULL. */
3251 if (secno == SHN_COMMON) {
3253 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3255 debugBelch("COMMON symbol, size %d name %s\n",
3256 stab[j].st_size, nm);
3258 /* Pointless to do addProddableBlock() for this area,
3259 since the linker should never poke around in it. */
3262 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3263 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3265 /* and not an undefined symbol */
3266 && stab[j].st_shndx != SHN_UNDEF
3267 /* and not in a "special section" */
3268 && stab[j].st_shndx < SHN_LORESERVE
3270 /* and it's a not a section or string table or anything silly */
3271 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3272 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3273 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3276 /* Section 0 is the undefined section, hence > and not >=. */
3277 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3279 if (shdr[secno].sh_type == SHT_NOBITS) {
3280 debugBelch(" BSS symbol, size %d off %d name %s\n",
3281 stab[j].st_size, stab[j].st_value, nm);
3284 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3285 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3288 #ifdef ELF_FUNCTION_DESC
3289 /* dlsym() and the initialisation table both give us function
3290 * descriptors, so to be consistent we store function descriptors
3291 * in the symbol table */
3292 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3293 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3295 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s\n",
3296 ad, oc->fileName, nm ));
3301 /* And the decision is ... */
3305 oc->symbols[j] = nm;
3308 /* Ignore entirely. */
3310 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3314 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3315 strtab + stab[j].st_name ));
3318 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3319 (int)ELF_ST_BIND(stab[j].st_info),
3320 (int)ELF_ST_TYPE(stab[j].st_info),
3321 (int)stab[j].st_shndx,
3322 strtab + stab[j].st_name
3325 oc->symbols[j] = NULL;
3334 /* Do ELF relocations which lack an explicit addend. All x86-linux
3335 relocations appear to be of this form. */
3337 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3338 Elf_Shdr* shdr, int shnum,
3339 Elf_Sym* stab, char* strtab )
3344 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3345 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3346 int target_shndx = shdr[shnum].sh_info;
3347 int symtab_shndx = shdr[shnum].sh_link;
3349 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3350 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3351 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3352 target_shndx, symtab_shndx ));
3354 /* Skip sections that we're not interested in. */
3357 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3358 if (kind == SECTIONKIND_OTHER) {
3359 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3364 for (j = 0; j < nent; j++) {
3365 Elf_Addr offset = rtab[j].r_offset;
3366 Elf_Addr info = rtab[j].r_info;
3368 Elf_Addr P = ((Elf_Addr)targ) + offset;
3369 Elf_Word* pP = (Elf_Word*)P;
3374 StgStablePtr stablePtr;
3377 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3378 j, (void*)offset, (void*)info ));
3380 IF_DEBUG(linker,debugBelch( " ZERO" ));
3383 Elf_Sym sym = stab[ELF_R_SYM(info)];
3384 /* First see if it is a local symbol. */
3385 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3386 /* Yes, so we can get the address directly from the ELF symbol
3388 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3390 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3391 + stab[ELF_R_SYM(info)].st_value);
3394 symbol = strtab + sym.st_name;
3395 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3396 if (NULL == stablePtr) {
3397 /* No, so look up the name in our global table. */
3398 S_tmp = lookupSymbol( symbol );
3399 S = (Elf_Addr)S_tmp;
3401 stableVal = deRefStablePtr( stablePtr );
3403 S = (Elf_Addr)S_tmp;
3407 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3410 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3413 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3414 (void*)P, (void*)S, (void*)A ));
3415 checkProddableBlock ( oc, pP );
3419 switch (ELF_R_TYPE(info)) {
3420 # ifdef i386_HOST_ARCH
3421 case R_386_32: *pP = value; break;
3422 case R_386_PC32: *pP = value - P; break;
3425 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3426 oc->fileName, (lnat)ELF_R_TYPE(info));
3434 /* Do ELF relocations for which explicit addends are supplied.
3435 sparc-solaris relocations appear to be of this form. */
3437 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3438 Elf_Shdr* shdr, int shnum,
3439 Elf_Sym* stab, char* strtab )
3442 char *symbol = NULL;
3444 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3445 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3446 int target_shndx = shdr[shnum].sh_info;
3447 int symtab_shndx = shdr[shnum].sh_link;
3449 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3450 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3451 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3452 target_shndx, symtab_shndx ));
3454 for (j = 0; j < nent; j++) {
3455 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3456 /* This #ifdef only serves to avoid unused-var warnings. */
3457 Elf_Addr offset = rtab[j].r_offset;
3458 Elf_Addr P = targ + offset;
3460 Elf_Addr info = rtab[j].r_info;
3461 Elf_Addr A = rtab[j].r_addend;
3465 # if defined(sparc_HOST_ARCH)
3466 Elf_Word* pP = (Elf_Word*)P;
3468 # elif defined(ia64_HOST_ARCH)
3469 Elf64_Xword *pP = (Elf64_Xword *)P;
3471 # elif defined(powerpc_HOST_ARCH)
3475 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3476 j, (void*)offset, (void*)info,
3479 IF_DEBUG(linker,debugBelch( " ZERO" ));
3482 Elf_Sym sym = stab[ELF_R_SYM(info)];
3483 /* First see if it is a local symbol. */
3484 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3485 /* Yes, so we can get the address directly from the ELF symbol
3487 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3489 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3490 + stab[ELF_R_SYM(info)].st_value);
3491 #ifdef ELF_FUNCTION_DESC
3492 /* Make a function descriptor for this function */
3493 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3494 S = allocateFunctionDesc(S + A);
3499 /* No, so look up the name in our global table. */
3500 symbol = strtab + sym.st_name;
3501 S_tmp = lookupSymbol( symbol );
3502 S = (Elf_Addr)S_tmp;
3504 #ifdef ELF_FUNCTION_DESC
3505 /* If a function, already a function descriptor - we would
3506 have to copy it to add an offset. */
3507 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3508 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3512 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3515 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3518 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3519 (void*)P, (void*)S, (void*)A ));
3520 /* checkProddableBlock ( oc, (void*)P ); */
3524 switch (ELF_R_TYPE(info)) {
3525 # if defined(sparc_HOST_ARCH)
3526 case R_SPARC_WDISP30:
3527 w1 = *pP & 0xC0000000;
3528 w2 = (Elf_Word)((value - P) >> 2);
3529 ASSERT((w2 & 0xC0000000) == 0);
3534 w1 = *pP & 0xFFC00000;
3535 w2 = (Elf_Word)(value >> 10);
3536 ASSERT((w2 & 0xFFC00000) == 0);
3542 w2 = (Elf_Word)(value & 0x3FF);
3543 ASSERT((w2 & ~0x3FF) == 0);
3547 /* According to the Sun documentation:
3549 This relocation type resembles R_SPARC_32, except it refers to an
3550 unaligned word. That is, the word to be relocated must be treated
3551 as four separate bytes with arbitrary alignment, not as a word
3552 aligned according to the architecture requirements.
3554 (JRS: which means that freeloading on the R_SPARC_32 case
3555 is probably wrong, but hey ...)
3559 w2 = (Elf_Word)value;
3562 # elif defined(ia64_HOST_ARCH)
3563 case R_IA64_DIR64LSB:
3564 case R_IA64_FPTR64LSB:
3567 case R_IA64_PCREL64LSB:
3570 case R_IA64_SEGREL64LSB:
3571 addr = findElfSegment(ehdrC, value);
3574 case R_IA64_GPREL22:
3575 ia64_reloc_gprel22(P, value);
3577 case R_IA64_LTOFF22:
3578 case R_IA64_LTOFF22X:
3579 case R_IA64_LTOFF_FPTR22:
3580 addr = allocateGOTEntry(value);
3581 ia64_reloc_gprel22(P, addr);
3583 case R_IA64_PCREL21B:
3584 ia64_reloc_pcrel21(P, S, oc);
3587 /* This goes with R_IA64_LTOFF22X and points to the load to
3588 * convert into a move. We don't implement relaxation. */
3590 # elif defined(powerpc_HOST_ARCH)
3591 case R_PPC_ADDR16_LO:
3592 *(Elf32_Half*) P = value;
3595 case R_PPC_ADDR16_HI:
3596 *(Elf32_Half*) P = value >> 16;
3599 case R_PPC_ADDR16_HA:
3600 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3604 *(Elf32_Word *) P = value;
3608 *(Elf32_Word *) P = value - P;
3614 if( delta << 6 >> 6 != delta )
3616 value = (Elf_Addr) (&makeSymbolExtra( oc, ELF_R_SYM(info), value )
3620 if( value == 0 || delta << 6 >> 6 != delta )
3622 barf( "Unable to make SymbolExtra for #%d",
3628 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3629 | (delta & 0x3fffffc);
3633 #if x86_64_HOST_ARCH
3635 *(Elf64_Xword *)P = value;
3640 StgInt64 off = value - P;
3641 if (off >= 0x7fffffffL || off < -0x80000000L) {
3642 #if X86_64_ELF_NONPIC_HACK
3643 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3645 off = pltAddress + A - P;
3647 barf("R_X86_64_PC32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3648 symbol, off, oc->fileName );
3651 *(Elf64_Word *)P = (Elf64_Word)off;
3657 StgInt64 off = value - P;
3658 *(Elf64_Word *)P = (Elf64_Word)off;
3663 if (value >= 0x7fffffffL) {
3664 #if X86_64_ELF_NONPIC_HACK
3665 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3667 value = pltAddress + A;
3669 barf("R_X86_64_32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3670 symbol, value, oc->fileName );
3673 *(Elf64_Word *)P = (Elf64_Word)value;
3677 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3678 #if X86_64_ELF_NONPIC_HACK
3679 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3681 value = pltAddress + A;
3683 barf("R_X86_64_32S relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3684 symbol, value, oc->fileName );
3687 *(Elf64_Sword *)P = (Elf64_Sword)value;
3690 case R_X86_64_GOTPCREL:
3692 StgInt64 gotAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)->addr;
3693 StgInt64 off = gotAddress + A - P;
3694 *(Elf64_Word *)P = (Elf64_Word)off;
3698 case R_X86_64_PLT32:
3700 StgInt64 off = value - P;
3701 if (off >= 0x7fffffffL || off < -0x80000000L) {
3702 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3704 off = pltAddress + A - P;
3706 *(Elf64_Word *)P = (Elf64_Word)off;
3712 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3713 oc->fileName, (lnat)ELF_R_TYPE(info));
3722 ocResolve_ELF ( ObjectCode* oc )
3726 Elf_Sym* stab = NULL;
3727 char* ehdrC = (char*)(oc->image);
3728 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3729 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3731 /* first find "the" symbol table */
3732 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3734 /* also go find the string table */
3735 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3737 if (stab == NULL || strtab == NULL) {
3738 errorBelch("%s: can't find string or symbol table", oc->fileName);
3742 /* Process the relocation sections. */
3743 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3744 if (shdr[shnum].sh_type == SHT_REL) {
3745 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3746 shnum, stab, strtab );
3750 if (shdr[shnum].sh_type == SHT_RELA) {
3751 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3752 shnum, stab, strtab );
3757 #if defined(powerpc_HOST_ARCH)
3758 ocFlushInstructionCache( oc );
3766 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3767 * at the front. The following utility functions pack and unpack instructions, and
3768 * take care of the most common relocations.
3771 #ifdef ia64_HOST_ARCH
3774 ia64_extract_instruction(Elf64_Xword *target)
3777 int slot = (Elf_Addr)target & 3;
3778 target = (Elf_Addr)target & ~3;
3786 return ((w1 >> 5) & 0x1ffffffffff);
3788 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3792 barf("ia64_extract_instruction: invalid slot %p", target);
3797 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3799 int slot = (Elf_Addr)target & 3;
3800 target = (Elf_Addr)target & ~3;
3805 *target |= value << 5;
3808 *target |= value << 46;
3809 *(target+1) |= value >> 18;
3812 *(target+1) |= value << 23;
3818 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3820 Elf64_Xword instruction;
3821 Elf64_Sxword rel_value;
3823 rel_value = value - gp_val;
3824 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3825 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3827 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3828 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3829 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3830 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3831 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3832 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3836 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3838 Elf64_Xword instruction;
3839 Elf64_Sxword rel_value;
3842 entry = allocatePLTEntry(value, oc);
3844 rel_value = (entry >> 4) - (target >> 4);
3845 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3846 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3848 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3849 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3850 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3851 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3857 * PowerPC & X86_64 ELF specifics
3860 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3862 static int ocAllocateSymbolExtras_ELF( ObjectCode *oc )
3868 ehdr = (Elf_Ehdr *) oc->image;
3869 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3871 for( i = 0; i < ehdr->e_shnum; i++ )
3872 if( shdr[i].sh_type == SHT_SYMTAB )
3875 if( i == ehdr->e_shnum )
3877 errorBelch( "This ELF file contains no symtab" );
3881 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3883 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3884 (int) shdr[i].sh_entsize, (int) sizeof( Elf_Sym ) );
3889 return ocAllocateSymbolExtras( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3892 #endif /* powerpc */
3896 /* --------------------------------------------------------------------------
3898 * ------------------------------------------------------------------------*/
3900 #if defined(OBJFORMAT_MACHO)
3903 Support for MachO linking on Darwin/MacOS X
3904 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3906 I hereby formally apologize for the hackish nature of this code.
3907 Things that need to be done:
3908 *) implement ocVerifyImage_MachO
3909 *) add still more sanity checks.
3912 #if x86_64_HOST_ARCH || powerpc64_HOST_ARCH
3913 #define mach_header mach_header_64
3914 #define segment_command segment_command_64
3915 #define section section_64
3916 #define nlist nlist_64
3919 #ifdef powerpc_HOST_ARCH
3920 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3922 struct mach_header *header = (struct mach_header *) oc->image;
3923 struct load_command *lc = (struct load_command *) (header + 1);
3926 for( i = 0; i < header->ncmds; i++ )
3928 if( lc->cmd == LC_SYMTAB )
3930 // Find out the first and last undefined external
3931 // symbol, so we don't have to allocate too many
3933 struct symtab_command *symLC = (struct symtab_command *) lc;
3934 unsigned min = symLC->nsyms, max = 0;
3935 struct nlist *nlist =
3936 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3938 for(i=0;i<symLC->nsyms;i++)
3940 if(nlist[i].n_type & N_STAB)
3942 else if(nlist[i].n_type & N_EXT)
3944 if((nlist[i].n_type & N_TYPE) == N_UNDF
3945 && (nlist[i].n_value == 0))
3955 return ocAllocateSymbolExtras(oc, max - min + 1, min);
3960 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3962 return ocAllocateSymbolExtras(oc,0,0);
3965 #ifdef x86_64_HOST_ARCH
3966 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3968 struct mach_header *header = (struct mach_header *) oc->image;
3969 struct load_command *lc = (struct load_command *) (header + 1);
3972 for( i = 0; i < header->ncmds; i++ )
3974 if( lc->cmd == LC_SYMTAB )
3976 // Just allocate one entry for every symbol
3977 struct symtab_command *symLC = (struct symtab_command *) lc;
3979 return ocAllocateSymbolExtras(oc, symLC->nsyms, 0);
3982 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3984 return ocAllocateSymbolExtras(oc,0,0);
3988 static int ocVerifyImage_MachO(ObjectCode* oc)
3990 char *image = (char*) oc->image;
3991 struct mach_header *header = (struct mach_header*) image;
3993 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
3994 if(header->magic != MH_MAGIC_64)
3997 if(header->magic != MH_MAGIC)
4000 // FIXME: do some more verifying here
4004 static int resolveImports(
4007 struct symtab_command *symLC,
4008 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
4009 unsigned long *indirectSyms,
4010 struct nlist *nlist)
4013 size_t itemSize = 4;
4016 int isJumpTable = 0;
4017 if(!strcmp(sect->sectname,"__jump_table"))
4021 ASSERT(sect->reserved2 == itemSize);
4025 for(i=0; i*itemSize < sect->size;i++)
4027 // according to otool, reserved1 contains the first index into the indirect symbol table
4028 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
4029 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4032 if((symbol->n_type & N_TYPE) == N_UNDF
4033 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
4034 addr = (void*) (symbol->n_value);
4036 addr = lookupSymbol(nm);
4039 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
4047 checkProddableBlock(oc,image + sect->offset + i*itemSize);
4048 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
4049 *(unsigned*)(image + sect->offset + i*itemSize + 1)
4050 = (char*)addr - (image + sect->offset + i*itemSize + 5);
4055 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
4056 ((void**)(image + sect->offset))[i] = addr;
4063 static unsigned long relocateAddress(
4066 struct section* sections,
4067 unsigned long address)
4070 for(i = 0; i < nSections; i++)
4072 if(sections[i].addr <= address
4073 && address < sections[i].addr + sections[i].size)
4075 return (unsigned long)oc->image
4076 + sections[i].offset + address - sections[i].addr;
4079 barf("Invalid Mach-O file:"
4080 "Address out of bounds while relocating object file");
4084 static int relocateSection(
4087 struct symtab_command *symLC, struct nlist *nlist,
4088 int nSections, struct section* sections, struct section *sect)
4090 struct relocation_info *relocs;
4093 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
4095 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
4097 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
4099 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
4103 relocs = (struct relocation_info*) (image + sect->reloff);
4107 #ifdef x86_64_HOST_ARCH
4108 struct relocation_info *reloc = &relocs[i];
4110 char *thingPtr = image + sect->offset + reloc->r_address;
4112 /* We shouldn't need to initialise this, but gcc on OS X 64 bit
4113 complains that it may be used uninitialized if we don't */
4116 int type = reloc->r_type;
4118 checkProddableBlock(oc,thingPtr);
4119 switch(reloc->r_length)
4122 thing = *(uint8_t*)thingPtr;
4123 baseValue = (uint64_t)thingPtr + 1;
4126 thing = *(uint16_t*)thingPtr;
4127 baseValue = (uint64_t)thingPtr + 2;
4130 thing = *(uint32_t*)thingPtr;
4131 baseValue = (uint64_t)thingPtr + 4;
4134 thing = *(uint64_t*)thingPtr;
4135 baseValue = (uint64_t)thingPtr + 8;
4138 barf("Unknown size.");
4141 if(type == X86_64_RELOC_GOT
4142 || type == X86_64_RELOC_GOT_LOAD)
4144 ASSERT(reloc->r_extern);
4145 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)->addr;
4147 type = X86_64_RELOC_SIGNED;
4149 else if(reloc->r_extern)
4151 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4152 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4153 if(symbol->n_value == 0)
4154 value = (uint64_t) lookupSymbol(nm);
4156 value = relocateAddress(oc, nSections, sections,
4161 value = sections[reloc->r_symbolnum-1].offset
4162 - sections[reloc->r_symbolnum-1].addr
4166 if(type == X86_64_RELOC_BRANCH)
4168 if((int32_t)(value - baseValue) != (int64_t)(value - baseValue))
4170 ASSERT(reloc->r_extern);
4171 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)
4174 ASSERT((int32_t)(value - baseValue) == (int64_t)(value - baseValue));
4175 type = X86_64_RELOC_SIGNED;
4180 case X86_64_RELOC_UNSIGNED:
4181 ASSERT(!reloc->r_pcrel);
4184 case X86_64_RELOC_SIGNED:
4185 ASSERT(reloc->r_pcrel);
4186 thing += value - baseValue;
4188 case X86_64_RELOC_SUBTRACTOR:
4189 ASSERT(!reloc->r_pcrel);
4193 barf("unkown relocation");
4196 switch(reloc->r_length)
4199 *(uint8_t*)thingPtr = thing;
4202 *(uint16_t*)thingPtr = thing;
4205 *(uint32_t*)thingPtr = thing;
4208 *(uint64_t*)thingPtr = thing;
4212 if(relocs[i].r_address & R_SCATTERED)
4214 struct scattered_relocation_info *scat =
4215 (struct scattered_relocation_info*) &relocs[i];
4219 if(scat->r_length == 2)
4221 unsigned long word = 0;
4222 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
4223 checkProddableBlock(oc,wordPtr);
4225 // Note on relocation types:
4226 // i386 uses the GENERIC_RELOC_* types,
4227 // while ppc uses special PPC_RELOC_* types.
4228 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
4229 // in both cases, all others are different.
4230 // Therefore, we use GENERIC_RELOC_VANILLA
4231 // and GENERIC_RELOC_PAIR instead of the PPC variants,
4232 // and use #ifdefs for the other types.
4234 // Step 1: Figure out what the relocated value should be
4235 if(scat->r_type == GENERIC_RELOC_VANILLA)
4237 word = *wordPtr + (unsigned long) relocateAddress(
4244 #ifdef powerpc_HOST_ARCH
4245 else if(scat->r_type == PPC_RELOC_SECTDIFF
4246 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
4247 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
4248 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
4250 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
4253 struct scattered_relocation_info *pair =
4254 (struct scattered_relocation_info*) &relocs[i+1];
4256 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
4257 barf("Invalid Mach-O file: "
4258 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
4260 word = (unsigned long)
4261 (relocateAddress(oc, nSections, sections, scat->r_value)
4262 - relocateAddress(oc, nSections, sections, pair->r_value));
4265 #ifdef powerpc_HOST_ARCH
4266 else if(scat->r_type == PPC_RELOC_HI16
4267 || scat->r_type == PPC_RELOC_LO16
4268 || scat->r_type == PPC_RELOC_HA16
4269 || scat->r_type == PPC_RELOC_LO14)
4270 { // these are generated by label+offset things
4271 struct relocation_info *pair = &relocs[i+1];
4272 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
4273 barf("Invalid Mach-O file: "
4274 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
4276 if(scat->r_type == PPC_RELOC_LO16)
4278 word = ((unsigned short*) wordPtr)[1];
4279 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4281 else if(scat->r_type == PPC_RELOC_LO14)
4283 barf("Unsupported Relocation: PPC_RELOC_LO14");
4284 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
4285 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4287 else if(scat->r_type == PPC_RELOC_HI16)
4289 word = ((unsigned short*) wordPtr)[1] << 16;
4290 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4292 else if(scat->r_type == PPC_RELOC_HA16)
4294 word = ((unsigned short*) wordPtr)[1] << 16;
4295 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4299 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4306 continue; // ignore the others
4308 #ifdef powerpc_HOST_ARCH
4309 if(scat->r_type == GENERIC_RELOC_VANILLA
4310 || scat->r_type == PPC_RELOC_SECTDIFF)
4312 if(scat->r_type == GENERIC_RELOC_VANILLA
4313 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4318 #ifdef powerpc_HOST_ARCH
4319 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4321 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4323 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4325 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4327 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4329 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4330 + ((word & (1<<15)) ? 1 : 0);
4336 continue; // FIXME: I hope it's OK to ignore all the others.
4340 struct relocation_info *reloc = &relocs[i];
4341 if(reloc->r_pcrel && !reloc->r_extern)
4344 if(reloc->r_length == 2)
4346 unsigned long word = 0;
4347 #ifdef powerpc_HOST_ARCH
4348 unsigned long jumpIsland = 0;
4349 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4350 // to avoid warning and to catch
4354 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4355 checkProddableBlock(oc,wordPtr);
4357 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4361 #ifdef powerpc_HOST_ARCH
4362 else if(reloc->r_type == PPC_RELOC_LO16)
4364 word = ((unsigned short*) wordPtr)[1];
4365 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4367 else if(reloc->r_type == PPC_RELOC_HI16)
4369 word = ((unsigned short*) wordPtr)[1] << 16;
4370 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4372 else if(reloc->r_type == PPC_RELOC_HA16)
4374 word = ((unsigned short*) wordPtr)[1] << 16;
4375 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4377 else if(reloc->r_type == PPC_RELOC_BR24)
4380 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4384 if(!reloc->r_extern)
4387 sections[reloc->r_symbolnum-1].offset
4388 - sections[reloc->r_symbolnum-1].addr
4395 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4396 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4397 void *symbolAddress = lookupSymbol(nm);
4400 errorBelch("\nunknown symbol `%s'", nm);
4406 #ifdef powerpc_HOST_ARCH
4407 // In the .o file, this should be a relative jump to NULL
4408 // and we'll change it to a relative jump to the symbol
4409 ASSERT(word + reloc->r_address == 0);
4410 jumpIsland = (unsigned long)
4411 &makeSymbolExtra(oc,
4413 (unsigned long) symbolAddress)
4417 offsetToJumpIsland = word + jumpIsland
4418 - (((long)image) + sect->offset - sect->addr);
4421 word += (unsigned long) symbolAddress
4422 - (((long)image) + sect->offset - sect->addr);
4426 word += (unsigned long) symbolAddress;
4430 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4435 #ifdef powerpc_HOST_ARCH
4436 else if(reloc->r_type == PPC_RELOC_LO16)
4438 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4441 else if(reloc->r_type == PPC_RELOC_HI16)
4443 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4446 else if(reloc->r_type == PPC_RELOC_HA16)
4448 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4449 + ((word & (1<<15)) ? 1 : 0);
4452 else if(reloc->r_type == PPC_RELOC_BR24)
4454 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4456 // The branch offset is too large.
4457 // Therefore, we try to use a jump island.
4460 barf("unconditional relative branch out of range: "
4461 "no jump island available");
4464 word = offsetToJumpIsland;
4465 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4466 barf("unconditional relative branch out of range: "
4467 "jump island out of range");
4469 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4474 barf("\nunknown relocation %d",reloc->r_type);
4482 static int ocGetNames_MachO(ObjectCode* oc)
4484 char *image = (char*) oc->image;
4485 struct mach_header *header = (struct mach_header*) image;
4486 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4487 unsigned i,curSymbol = 0;
4488 struct segment_command *segLC = NULL;
4489 struct section *sections;
4490 struct symtab_command *symLC = NULL;
4491 struct nlist *nlist;
4492 unsigned long commonSize = 0;
4493 char *commonStorage = NULL;
4494 unsigned long commonCounter;
4496 for(i=0;i<header->ncmds;i++)
4498 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4499 segLC = (struct segment_command*) lc;
4500 else if(lc->cmd == LC_SYMTAB)
4501 symLC = (struct symtab_command*) lc;
4502 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4505 sections = (struct section*) (segLC+1);
4506 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4510 barf("ocGetNames_MachO: no segment load command");
4512 for(i=0;i<segLC->nsects;i++)
4514 if(sections[i].size == 0)
4517 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4519 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4520 "ocGetNames_MachO(common symbols)");
4521 sections[i].offset = zeroFillArea - image;
4524 if(!strcmp(sections[i].sectname,"__text"))
4525 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4526 (void*) (image + sections[i].offset),
4527 (void*) (image + sections[i].offset + sections[i].size));
4528 else if(!strcmp(sections[i].sectname,"__const"))
4529 addSection(oc, SECTIONKIND_RWDATA,
4530 (void*) (image + sections[i].offset),
4531 (void*) (image + sections[i].offset + sections[i].size));
4532 else if(!strcmp(sections[i].sectname,"__data"))
4533 addSection(oc, SECTIONKIND_RWDATA,
4534 (void*) (image + sections[i].offset),
4535 (void*) (image + sections[i].offset + sections[i].size));
4536 else if(!strcmp(sections[i].sectname,"__bss")
4537 || !strcmp(sections[i].sectname,"__common"))
4538 addSection(oc, SECTIONKIND_RWDATA,
4539 (void*) (image + sections[i].offset),
4540 (void*) (image + sections[i].offset + sections[i].size));
4542 addProddableBlock(oc, (void*) (image + sections[i].offset),
4546 // count external symbols defined here
4550 for(i=0;i<symLC->nsyms;i++)
4552 if(nlist[i].n_type & N_STAB)
4554 else if(nlist[i].n_type & N_EXT)
4556 if((nlist[i].n_type & N_TYPE) == N_UNDF
4557 && (nlist[i].n_value != 0))
4559 commonSize += nlist[i].n_value;
4562 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4567 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4568 "ocGetNames_MachO(oc->symbols)");
4572 for(i=0;i<symLC->nsyms;i++)
4574 if(nlist[i].n_type & N_STAB)
4576 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4578 if(nlist[i].n_type & N_EXT)
4580 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4581 if((nlist[i].n_desc & N_WEAK_DEF) && lookupSymbol(nm))
4582 ; // weak definition, and we already have a definition
4585 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4587 + sections[nlist[i].n_sect-1].offset
4588 - sections[nlist[i].n_sect-1].addr
4589 + nlist[i].n_value);
4590 oc->symbols[curSymbol++] = nm;
4597 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4598 commonCounter = (unsigned long)commonStorage;
4601 for(i=0;i<symLC->nsyms;i++)
4603 if((nlist[i].n_type & N_TYPE) == N_UNDF
4604 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4606 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4607 unsigned long sz = nlist[i].n_value;
4609 nlist[i].n_value = commonCounter;
4611 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4612 (void*)commonCounter);
4613 oc->symbols[curSymbol++] = nm;
4615 commonCounter += sz;
4622 static int ocResolve_MachO(ObjectCode* oc)
4624 char *image = (char*) oc->image;
4625 struct mach_header *header = (struct mach_header*) image;
4626 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4628 struct segment_command *segLC = NULL;
4629 struct section *sections;
4630 struct symtab_command *symLC = NULL;
4631 struct dysymtab_command *dsymLC = NULL;
4632 struct nlist *nlist;
4634 for(i=0;i<header->ncmds;i++)
4636 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4637 segLC = (struct segment_command*) lc;
4638 else if(lc->cmd == LC_SYMTAB)
4639 symLC = (struct symtab_command*) lc;
4640 else if(lc->cmd == LC_DYSYMTAB)
4641 dsymLC = (struct dysymtab_command*) lc;
4642 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4645 sections = (struct section*) (segLC+1);
4646 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4651 unsigned long *indirectSyms
4652 = (unsigned long*) (image + dsymLC->indirectsymoff);
4654 for(i=0;i<segLC->nsects;i++)
4656 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4657 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4658 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4660 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4663 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4664 || !strcmp(sections[i].sectname,"__pointers"))
4666 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4669 else if(!strcmp(sections[i].sectname,"__jump_table"))
4671 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4677 for(i=0;i<segLC->nsects;i++)
4679 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4683 #if defined (powerpc_HOST_ARCH)
4684 ocFlushInstructionCache( oc );
4690 #ifdef powerpc_HOST_ARCH
4692 * The Mach-O object format uses leading underscores. But not everywhere.
4693 * There is a small number of runtime support functions defined in
4694 * libcc_dynamic.a whose name does not have a leading underscore.
4695 * As a consequence, we can't get their address from C code.
4696 * We have to use inline assembler just to take the address of a function.
4700 static void machoInitSymbolsWithoutUnderscore()
4702 extern void* symbolsWithoutUnderscore[];
4703 void **p = symbolsWithoutUnderscore;
4704 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4706 #undef SymI_NeedsProto
4707 #define SymI_NeedsProto(x) \
4708 __asm__ volatile(".long " # x);
4710 RTS_MACHO_NOUNDERLINE_SYMBOLS
4712 __asm__ volatile(".text");
4714 #undef SymI_NeedsProto
4715 #define SymI_NeedsProto(x) \
4716 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4718 RTS_MACHO_NOUNDERLINE_SYMBOLS
4720 #undef SymI_NeedsProto
4725 * Figure out by how much to shift the entire Mach-O file in memory
4726 * when loading so that its single segment ends up 16-byte-aligned
4728 static int machoGetMisalignment( FILE * f )
4730 struct mach_header header;
4733 fread(&header, sizeof(header), 1, f);
4736 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
4737 if(header.magic != MH_MAGIC_64)
4740 if(header.magic != MH_MAGIC)
4744 misalignment = (header.sizeofcmds + sizeof(header))
4747 return misalignment ? (16 - misalignment) : 0;