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 "RtsTypeable.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 = 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(asyncExceptionsBlockedzh_fast) \
613 SymI_HasProto(blockAsyncExceptionszh_fast) \
614 SymI_HasProto(catchzh_fast) \
615 SymI_HasProto(catchRetryzh_fast) \
616 SymI_HasProto(catchSTMzh_fast) \
617 SymI_HasProto(checkzh_fast) \
618 SymI_HasProto(closure_flags) \
619 SymI_HasProto(cmp_thread) \
620 SymI_HasProto(cmpIntegerzh_fast) \
621 SymI_HasProto(cmpIntegerIntzh_fast) \
622 SymI_HasProto(complementIntegerzh_fast) \
623 SymI_HasProto(createAdjustor) \
624 SymI_HasProto(decodeDoublezh_fast) \
625 SymI_HasProto(decodeFloatzh_fast) \
626 SymI_HasProto(decodeDoublezu2Intzh_fast) \
627 SymI_HasProto(decodeFloatzuIntzh_fast) \
628 SymI_HasProto(defaultsHook) \
629 SymI_HasProto(delayzh_fast) \
630 SymI_HasProto(deRefWeakzh_fast) \
631 SymI_HasProto(deRefStablePtrzh_fast) \
632 SymI_HasProto(dirty_MUT_VAR) \
633 SymI_HasProto(divExactIntegerzh_fast) \
634 SymI_HasProto(divModIntegerzh_fast) \
635 SymI_HasProto(forkzh_fast) \
636 SymI_HasProto(forkOnzh_fast) \
637 SymI_HasProto(forkProcess) \
638 SymI_HasProto(forkOS_createThread) \
639 SymI_HasProto(freeHaskellFunctionPtr) \
640 SymI_HasProto(freeStablePtr) \
641 SymI_HasProto(getOrSetTypeableStore) \
642 SymI_HasProto(gcdIntegerzh_fast) \
643 SymI_HasProto(gcdIntegerIntzh_fast) \
644 SymI_HasProto(gcdIntzh_fast) \
645 SymI_HasProto(genSymZh) \
646 SymI_HasProto(genericRaise) \
647 SymI_HasProto(getProgArgv) \
648 SymI_HasProto(getFullProgArgv) \
649 SymI_HasProto(getStablePtr) \
650 SymI_HasProto(hs_init) \
651 SymI_HasProto(hs_exit) \
652 SymI_HasProto(hs_set_argv) \
653 SymI_HasProto(hs_add_root) \
654 SymI_HasProto(hs_perform_gc) \
655 SymI_HasProto(hs_free_stable_ptr) \
656 SymI_HasProto(hs_free_fun_ptr) \
657 SymI_HasProto(hs_hpc_rootModule) \
658 SymI_HasProto(initLinker) \
659 SymI_HasProto(unpackClosurezh_fast) \
660 SymI_HasProto(getApStackValzh_fast) \
661 SymI_HasProto(getSparkzh_fast) \
662 SymI_HasProto(int2Integerzh_fast) \
663 SymI_HasProto(integer2Intzh_fast) \
664 SymI_HasProto(integer2Wordzh_fast) \
665 SymI_HasProto(isCurrentThreadBoundzh_fast) \
666 SymI_HasProto(isDoubleDenormalized) \
667 SymI_HasProto(isDoubleInfinite) \
668 SymI_HasProto(isDoubleNaN) \
669 SymI_HasProto(isDoubleNegativeZero) \
670 SymI_HasProto(isEmptyMVarzh_fast) \
671 SymI_HasProto(isFloatDenormalized) \
672 SymI_HasProto(isFloatInfinite) \
673 SymI_HasProto(isFloatNaN) \
674 SymI_HasProto(isFloatNegativeZero) \
675 SymI_HasProto(killThreadzh_fast) \
676 SymI_HasProto(loadObj) \
677 SymI_HasProto(insertStableSymbol) \
678 SymI_HasProto(insertSymbol) \
679 SymI_HasProto(lookupSymbol) \
680 SymI_HasProto(makeStablePtrzh_fast) \
681 SymI_HasProto(minusIntegerzh_fast) \
682 SymI_HasProto(mkApUpd0zh_fast) \
683 SymI_HasProto(myThreadIdzh_fast) \
684 SymI_HasProto(labelThreadzh_fast) \
685 SymI_HasProto(newArrayzh_fast) \
686 SymI_HasProto(newBCOzh_fast) \
687 SymI_HasProto(newByteArrayzh_fast) \
688 SymI_HasProto_redirect(newCAF, newDynCAF) \
689 SymI_HasProto(newMVarzh_fast) \
690 SymI_HasProto(newMutVarzh_fast) \
691 SymI_HasProto(newTVarzh_fast) \
692 SymI_HasProto(noDuplicatezh_fast) \
693 SymI_HasProto(atomicModifyMutVarzh_fast) \
694 SymI_HasProto(newPinnedByteArrayzh_fast) \
695 SymI_HasProto(newAlignedPinnedByteArrayzh_fast) \
696 SymI_HasProto(newSpark) \
697 SymI_HasProto(orIntegerzh_fast) \
698 SymI_HasProto(performGC) \
699 SymI_HasProto(performMajorGC) \
700 SymI_HasProto(plusIntegerzh_fast) \
701 SymI_HasProto(prog_argc) \
702 SymI_HasProto(prog_argv) \
703 SymI_HasProto(putMVarzh_fast) \
704 SymI_HasProto(quotIntegerzh_fast) \
705 SymI_HasProto(quotRemIntegerzh_fast) \
706 SymI_HasProto(raisezh_fast) \
707 SymI_HasProto(raiseIOzh_fast) \
708 SymI_HasProto(readTVarzh_fast) \
709 SymI_HasProto(readTVarIOzh_fast) \
710 SymI_HasProto(remIntegerzh_fast) \
711 SymI_HasProto(resetNonBlockingFd) \
712 SymI_HasProto(resumeThread) \
713 SymI_HasProto(resolveObjs) \
714 SymI_HasProto(retryzh_fast) \
715 SymI_HasProto(rts_apply) \
716 SymI_HasProto(rts_checkSchedStatus) \
717 SymI_HasProto(rts_eval) \
718 SymI_HasProto(rts_evalIO) \
719 SymI_HasProto(rts_evalLazyIO) \
720 SymI_HasProto(rts_evalStableIO) \
721 SymI_HasProto(rts_eval_) \
722 SymI_HasProto(rts_getBool) \
723 SymI_HasProto(rts_getChar) \
724 SymI_HasProto(rts_getDouble) \
725 SymI_HasProto(rts_getFloat) \
726 SymI_HasProto(rts_getInt) \
727 SymI_HasProto(rts_getInt8) \
728 SymI_HasProto(rts_getInt16) \
729 SymI_HasProto(rts_getInt32) \
730 SymI_HasProto(rts_getInt64) \
731 SymI_HasProto(rts_getPtr) \
732 SymI_HasProto(rts_getFunPtr) \
733 SymI_HasProto(rts_getStablePtr) \
734 SymI_HasProto(rts_getThreadId) \
735 SymI_HasProto(rts_getWord) \
736 SymI_HasProto(rts_getWord8) \
737 SymI_HasProto(rts_getWord16) \
738 SymI_HasProto(rts_getWord32) \
739 SymI_HasProto(rts_getWord64) \
740 SymI_HasProto(rts_lock) \
741 SymI_HasProto(rts_mkBool) \
742 SymI_HasProto(rts_mkChar) \
743 SymI_HasProto(rts_mkDouble) \
744 SymI_HasProto(rts_mkFloat) \
745 SymI_HasProto(rts_mkInt) \
746 SymI_HasProto(rts_mkInt8) \
747 SymI_HasProto(rts_mkInt16) \
748 SymI_HasProto(rts_mkInt32) \
749 SymI_HasProto(rts_mkInt64) \
750 SymI_HasProto(rts_mkPtr) \
751 SymI_HasProto(rts_mkFunPtr) \
752 SymI_HasProto(rts_mkStablePtr) \
753 SymI_HasProto(rts_mkString) \
754 SymI_HasProto(rts_mkWord) \
755 SymI_HasProto(rts_mkWord8) \
756 SymI_HasProto(rts_mkWord16) \
757 SymI_HasProto(rts_mkWord32) \
758 SymI_HasProto(rts_mkWord64) \
759 SymI_HasProto(rts_unlock) \
760 SymI_HasProto(rtsSupportsBoundThreads) \
761 SymI_HasProto(__hscore_get_saved_termios) \
762 SymI_HasProto(__hscore_set_saved_termios) \
763 SymI_HasProto(setProgArgv) \
764 SymI_HasProto(startupHaskell) \
765 SymI_HasProto(shutdownHaskell) \
766 SymI_HasProto(shutdownHaskellAndExit) \
767 SymI_HasProto(stable_ptr_table) \
768 SymI_HasProto(stackOverflow) \
769 SymI_HasProto(stg_CAF_BLACKHOLE_info) \
770 SymI_HasProto(__stg_EAGER_BLACKHOLE_info) \
771 SymI_HasProto(awakenBlockedQueue) \
772 SymI_HasProto(startTimer) \
773 SymI_HasProto(stg_CHARLIKE_closure) \
774 SymI_HasProto(stg_MVAR_CLEAN_info) \
775 SymI_HasProto(stg_MVAR_DIRTY_info) \
776 SymI_HasProto(stg_IND_STATIC_info) \
777 SymI_HasProto(stg_INTLIKE_closure) \
778 SymI_HasProto(stg_MUT_ARR_PTRS_DIRTY_info) \
779 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN_info) \
780 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN0_info) \
781 SymI_HasProto(stg_WEAK_info) \
782 SymI_HasProto(stg_ap_v_info) \
783 SymI_HasProto(stg_ap_f_info) \
784 SymI_HasProto(stg_ap_d_info) \
785 SymI_HasProto(stg_ap_l_info) \
786 SymI_HasProto(stg_ap_n_info) \
787 SymI_HasProto(stg_ap_p_info) \
788 SymI_HasProto(stg_ap_pv_info) \
789 SymI_HasProto(stg_ap_pp_info) \
790 SymI_HasProto(stg_ap_ppv_info) \
791 SymI_HasProto(stg_ap_ppp_info) \
792 SymI_HasProto(stg_ap_pppv_info) \
793 SymI_HasProto(stg_ap_pppp_info) \
794 SymI_HasProto(stg_ap_ppppp_info) \
795 SymI_HasProto(stg_ap_pppppp_info) \
796 SymI_HasProto(stg_ap_0_fast) \
797 SymI_HasProto(stg_ap_v_fast) \
798 SymI_HasProto(stg_ap_f_fast) \
799 SymI_HasProto(stg_ap_d_fast) \
800 SymI_HasProto(stg_ap_l_fast) \
801 SymI_HasProto(stg_ap_n_fast) \
802 SymI_HasProto(stg_ap_p_fast) \
803 SymI_HasProto(stg_ap_pv_fast) \
804 SymI_HasProto(stg_ap_pp_fast) \
805 SymI_HasProto(stg_ap_ppv_fast) \
806 SymI_HasProto(stg_ap_ppp_fast) \
807 SymI_HasProto(stg_ap_pppv_fast) \
808 SymI_HasProto(stg_ap_pppp_fast) \
809 SymI_HasProto(stg_ap_ppppp_fast) \
810 SymI_HasProto(stg_ap_pppppp_fast) \
811 SymI_HasProto(stg_ap_1_upd_info) \
812 SymI_HasProto(stg_ap_2_upd_info) \
813 SymI_HasProto(stg_ap_3_upd_info) \
814 SymI_HasProto(stg_ap_4_upd_info) \
815 SymI_HasProto(stg_ap_5_upd_info) \
816 SymI_HasProto(stg_ap_6_upd_info) \
817 SymI_HasProto(stg_ap_7_upd_info) \
818 SymI_HasProto(stg_exit) \
819 SymI_HasProto(stg_sel_0_upd_info) \
820 SymI_HasProto(stg_sel_10_upd_info) \
821 SymI_HasProto(stg_sel_11_upd_info) \
822 SymI_HasProto(stg_sel_12_upd_info) \
823 SymI_HasProto(stg_sel_13_upd_info) \
824 SymI_HasProto(stg_sel_14_upd_info) \
825 SymI_HasProto(stg_sel_15_upd_info) \
826 SymI_HasProto(stg_sel_1_upd_info) \
827 SymI_HasProto(stg_sel_2_upd_info) \
828 SymI_HasProto(stg_sel_3_upd_info) \
829 SymI_HasProto(stg_sel_4_upd_info) \
830 SymI_HasProto(stg_sel_5_upd_info) \
831 SymI_HasProto(stg_sel_6_upd_info) \
832 SymI_HasProto(stg_sel_7_upd_info) \
833 SymI_HasProto(stg_sel_8_upd_info) \
834 SymI_HasProto(stg_sel_9_upd_info) \
835 SymI_HasProto(stg_upd_frame_info) \
836 SymI_HasProto(suspendThread) \
837 SymI_HasProto(takeMVarzh_fast) \
838 SymI_HasProto(threadStatuszh_fast) \
839 SymI_HasProto(timesIntegerzh_fast) \
840 SymI_HasProto(tryPutMVarzh_fast) \
841 SymI_HasProto(tryTakeMVarzh_fast) \
842 SymI_HasProto(unblockAsyncExceptionszh_fast) \
843 SymI_HasProto(unloadObj) \
844 SymI_HasProto(unsafeThawArrayzh_fast) \
845 SymI_HasProto(waitReadzh_fast) \
846 SymI_HasProto(waitWritezh_fast) \
847 SymI_HasProto(word2Integerzh_fast) \
848 SymI_HasProto(writeTVarzh_fast) \
849 SymI_HasProto(xorIntegerzh_fast) \
850 SymI_HasProto(yieldzh_fast) \
851 SymI_NeedsProto(stg_interp_constr_entry) \
852 SymI_HasProto(allocateExec) \
853 SymI_HasProto(freeExec) \
854 SymI_HasProto(getAllocations) \
855 SymI_HasProto(revertCAFs) \
856 SymI_HasProto(RtsFlags) \
857 SymI_NeedsProto(rts_breakpoint_io_action) \
858 SymI_NeedsProto(rts_stop_next_breakpoint) \
859 SymI_NeedsProto(rts_stop_on_exception) \
860 SymI_HasProto(stopTimer) \
861 SymI_HasProto(n_capabilities) \
862 SymI_HasProto(traceCcszh_fast) \
863 RTS_USER_SIGNALS_SYMBOLS
865 #ifdef SUPPORT_LONG_LONGS
866 #define RTS_LONG_LONG_SYMS \
867 SymI_HasProto(int64ToIntegerzh_fast) \
868 SymI_HasProto(word64ToIntegerzh_fast)
870 #define RTS_LONG_LONG_SYMS /* nothing */
873 // 64-bit support functions in libgcc.a
874 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
875 #define RTS_LIBGCC_SYMBOLS \
876 SymI_NeedsProto(__divdi3) \
877 SymI_NeedsProto(__udivdi3) \
878 SymI_NeedsProto(__moddi3) \
879 SymI_NeedsProto(__umoddi3) \
880 SymI_NeedsProto(__muldi3) \
881 SymI_NeedsProto(__ashldi3) \
882 SymI_NeedsProto(__ashrdi3) \
883 SymI_NeedsProto(__lshrdi3) \
884 SymI_NeedsProto(__eprintf)
885 #elif defined(ia64_HOST_ARCH)
886 #define RTS_LIBGCC_SYMBOLS \
887 SymI_NeedsProto(__divdi3) \
888 SymI_NeedsProto(__udivdi3) \
889 SymI_NeedsProto(__moddi3) \
890 SymI_NeedsProto(__umoddi3) \
891 SymI_NeedsProto(__divsf3) \
892 SymI_NeedsProto(__divdf3)
894 #define RTS_LIBGCC_SYMBOLS
897 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
898 // Symbols that don't have a leading underscore
899 // on Mac OS X. They have to receive special treatment,
900 // see machoInitSymbolsWithoutUnderscore()
901 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
902 SymI_NeedsProto(saveFP) \
903 SymI_NeedsProto(restFP)
906 /* entirely bogus claims about types of these symbols */
907 #define SymI_NeedsProto(vvv) extern void vvv(void);
908 #if defined(__PIC__) && defined(mingw32_TARGET_OS)
909 #define SymE_HasProto(vvv) SymE_HasProto(vvv);
910 #define SymE_NeedsProto(vvv) extern void _imp__ ## vvv (void);
912 #define SymE_NeedsProto(vvv) SymI_NeedsProto(vvv);
913 #define SymE_HasProto(vvv) SymI_HasProto(vvv)
915 #define SymI_HasProto(vvv) /**/
916 #define SymI_HasProto_redirect(vvv,xxx) /**/
920 RTS_POSIX_ONLY_SYMBOLS
921 RTS_MINGW_ONLY_SYMBOLS
922 RTS_CYGWIN_ONLY_SYMBOLS
923 RTS_DARWIN_ONLY_SYMBOLS
926 #undef SymI_NeedsProto
928 #undef SymI_HasProto_redirect
930 #undef SymE_NeedsProto
932 #ifdef LEADING_UNDERSCORE
933 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
935 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
938 #define SymI_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
940 #define SymE_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
941 (void*)DLL_IMPORT_DATA_REF(vvv) },
943 #define SymI_NeedsProto(vvv) SymI_HasProto(vvv)
944 #define SymE_NeedsProto(vvv) SymE_HasProto(vvv)
946 // SymI_HasProto_redirect allows us to redirect references to one symbol to
947 // another symbol. See newCAF/newDynCAF for an example.
948 #define SymI_HasProto_redirect(vvv,xxx) \
949 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
952 static RtsSymbolVal rtsSyms[] = {
956 RTS_POSIX_ONLY_SYMBOLS
957 RTS_MINGW_ONLY_SYMBOLS
958 RTS_CYGWIN_ONLY_SYMBOLS
959 RTS_DARWIN_ONLY_SYMBOLS
962 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
963 // dyld stub code contains references to this,
964 // but it should never be called because we treat
965 // lazy pointers as nonlazy.
966 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
968 { 0, 0 } /* sentinel */
973 /* -----------------------------------------------------------------------------
974 * Insert symbols into hash tables, checking for duplicates.
977 static void ghciInsertStrHashTable ( char* obj_name,
983 if (lookupHashTable(table, (StgWord)key) == NULL)
985 insertStrHashTable(table, (StgWord)key, data);
990 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
992 "whilst processing object file\n"
994 "This could be caused by:\n"
995 " * Loading two different object files which export the same symbol\n"
996 " * Specifying the same object file twice on the GHCi command line\n"
997 " * An incorrect `package.conf' entry, causing some object to be\n"
999 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
1006 /* -----------------------------------------------------------------------------
1007 * initialize the object linker
1011 static int linker_init_done = 0 ;
1013 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1014 static void *dl_prog_handle;
1022 /* Make initLinker idempotent, so we can call it
1023 before evey relevant operation; that means we
1024 don't need to initialise the linker separately */
1025 if (linker_init_done == 1) { return; } else {
1026 linker_init_done = 1;
1029 stablehash = allocStrHashTable();
1030 symhash = allocStrHashTable();
1032 /* populate the symbol table with stuff from the RTS */
1033 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
1034 ghciInsertStrHashTable("(GHCi built-in symbols)",
1035 symhash, sym->lbl, sym->addr);
1037 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1038 machoInitSymbolsWithoutUnderscore();
1041 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1042 # if defined(RTLD_DEFAULT)
1043 dl_prog_handle = RTLD_DEFAULT;
1045 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
1046 # endif /* RTLD_DEFAULT */
1049 #if defined(x86_64_HOST_ARCH)
1050 if (RtsFlags.MiscFlags.linkerMemBase != 0) {
1051 // User-override for mmap_32bit_base
1052 mmap_32bit_base = (void*)RtsFlags.MiscFlags.linkerMemBase;
1057 /* -----------------------------------------------------------------------------
1058 * Loading DLL or .so dynamic libraries
1059 * -----------------------------------------------------------------------------
1061 * Add a DLL from which symbols may be found. In the ELF case, just
1062 * do RTLD_GLOBAL-style add, so no further messing around needs to
1063 * happen in order that symbols in the loaded .so are findable --
1064 * lookupSymbol() will subsequently see them by dlsym on the program's
1065 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
1067 * In the PEi386 case, open the DLLs and put handles to them in a
1068 * linked list. When looking for a symbol, try all handles in the
1069 * list. This means that we need to load even DLLs that are guaranteed
1070 * to be in the ghc.exe image already, just so we can get a handle
1071 * to give to loadSymbol, so that we can find the symbols. For such
1072 * libraries, the LoadLibrary call should be a no-op except for returning
1077 #if defined(OBJFORMAT_PEi386)
1078 /* A record for storing handles into DLLs. */
1083 struct _OpenedDLL* next;
1088 /* A list thereof. */
1089 static OpenedDLL* opened_dlls = NULL;
1093 addDLL( char *dll_name )
1095 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1096 /* ------------------- ELF DLL loader ------------------- */
1102 // omitted: RTLD_NOW
1103 // see http://www.haskell.org/pipermail/cvs-ghc/2007-September/038570.html
1104 hdl= dlopen(dll_name, RTLD_LAZY | RTLD_GLOBAL);
1107 /* dlopen failed; return a ptr to the error msg. */
1109 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1116 # elif defined(OBJFORMAT_PEi386)
1117 /* ------------------- Win32 DLL loader ------------------- */
1125 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1127 /* See if we've already got it, and ignore if so. */
1128 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1129 if (0 == strcmp(o_dll->name, dll_name))
1133 /* The file name has no suffix (yet) so that we can try
1134 both foo.dll and foo.drv
1136 The documentation for LoadLibrary says:
1137 If no file name extension is specified in the lpFileName
1138 parameter, the default library extension .dll is
1139 appended. However, the file name string can include a trailing
1140 point character (.) to indicate that the module name has no
1143 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1144 sprintf(buf, "%s.DLL", dll_name);
1145 instance = LoadLibrary(buf);
1146 if (instance == NULL) {
1147 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1148 // KAA: allow loading of drivers (like winspool.drv)
1149 sprintf(buf, "%s.DRV", dll_name);
1150 instance = LoadLibrary(buf);
1151 if (instance == NULL) {
1152 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1153 // #1883: allow loading of unix-style libfoo.dll DLLs
1154 sprintf(buf, "lib%s.DLL", dll_name);
1155 instance = LoadLibrary(buf);
1156 if (instance == NULL) {
1163 /* Add this DLL to the list of DLLs in which to search for symbols. */
1164 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1165 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1166 strcpy(o_dll->name, dll_name);
1167 o_dll->instance = instance;
1168 o_dll->next = opened_dlls;
1169 opened_dlls = o_dll;
1175 sysErrorBelch(dll_name);
1177 /* LoadLibrary failed; return a ptr to the error msg. */
1178 return "addDLL: could not load DLL";
1181 barf("addDLL: not implemented on this platform");
1185 /* -----------------------------------------------------------------------------
1186 * insert a stable symbol in the hash table
1190 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1192 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1196 /* -----------------------------------------------------------------------------
1197 * insert a symbol in the hash table
1200 insertSymbol(char* obj_name, char* key, void* data)
1202 ghciInsertStrHashTable(obj_name, symhash, key, data);
1205 /* -----------------------------------------------------------------------------
1206 * lookup a symbol in the hash table
1209 lookupSymbol( char *lbl )
1213 ASSERT(symhash != NULL);
1214 val = lookupStrHashTable(symhash, lbl);
1217 # if defined(OBJFORMAT_ELF)
1218 return dlsym(dl_prog_handle, lbl);
1219 # elif defined(OBJFORMAT_MACHO)
1221 /* On OS X 10.3 and later, we use dlsym instead of the old legacy
1224 HACK: On OS X, global symbols are prefixed with an underscore.
1225 However, dlsym wants us to omit the leading underscore from the
1226 symbol name. For now, we simply strip it off here (and ONLY
1229 ASSERT(lbl[0] == '_');
1230 return dlsym(dl_prog_handle, lbl+1);
1232 if(NSIsSymbolNameDefined(lbl)) {
1233 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1234 return NSAddressOfSymbol(symbol);
1238 # endif /* HAVE_DLFCN_H */
1239 # elif defined(OBJFORMAT_PEi386)
1242 sym = lookupSymbolInDLLs(lbl);
1243 if (sym != NULL) { return sym; };
1245 // Also try looking up the symbol without the @N suffix. Some
1246 // DLLs have the suffixes on their symbols, some don't.
1247 zapTrailingAtSign ( lbl );
1248 sym = lookupSymbolInDLLs(lbl);
1249 if (sym != NULL) { return sym; };
1261 /* -----------------------------------------------------------------------------
1262 * Debugging aid: look in GHCi's object symbol tables for symbols
1263 * within DELTA bytes of the specified address, and show their names.
1266 void ghci_enquire ( char* addr );
1268 void ghci_enquire ( char* addr )
1273 const int DELTA = 64;
1278 for (oc = objects; oc; oc = oc->next) {
1279 for (i = 0; i < oc->n_symbols; i++) {
1280 sym = oc->symbols[i];
1281 if (sym == NULL) continue;
1284 a = lookupStrHashTable(symhash, sym);
1287 // debugBelch("ghci_enquire: can't find %s\n", sym);
1289 else if (addr-DELTA <= a && a <= addr+DELTA) {
1290 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1297 #ifdef ia64_HOST_ARCH
1298 static unsigned int PLTSize(void);
1302 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1305 mmapForLinker (size_t bytes, nat flags, int fd)
1307 void *map_addr = NULL;
1310 static nat fixed = 0;
1312 pagesize = getpagesize();
1313 size = ROUND_UP(bytes, pagesize);
1315 #if defined(x86_64_HOST_ARCH)
1318 if (mmap_32bit_base != 0) {
1319 map_addr = mmap_32bit_base;
1323 result = mmap(map_addr, size, PROT_EXEC|PROT_READ|PROT_WRITE,
1324 MAP_PRIVATE|TRY_MAP_32BIT|fixed|flags, fd, 0);
1326 if (result == MAP_FAILED) {
1327 sysErrorBelch("mmap %lu bytes at %p",(lnat)size,map_addr);
1328 errorBelch("Try specifying an address with +RTS -xm<addr> -RTS");
1329 stg_exit(EXIT_FAILURE);
1332 #if defined(x86_64_HOST_ARCH)
1333 if (mmap_32bit_base != 0) {
1334 if (result == map_addr) {
1335 mmap_32bit_base = map_addr + size;
1337 if ((W_)result > 0x80000000) {
1338 // oops, we were given memory over 2Gb
1339 #if defined(freebsd_HOST_OS)
1340 // Some platforms require MAP_FIXED. This is normally
1341 // a bad idea, because MAP_FIXED will overwrite
1342 // existing mappings.
1343 munmap(result,size);
1347 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);
1350 // hmm, we were given memory somewhere else, but it's
1351 // still under 2Gb so we can use it. Next time, ask
1352 // for memory right after the place we just got some
1353 mmap_32bit_base = (void*)result + size;
1357 if ((W_)result > 0x80000000) {
1358 // oops, we were given memory over 2Gb
1359 // ... try allocating memory somewhere else?;
1360 debugTrace(DEBUG_linker,"MAP_32BIT didn't work; gave us %lu bytes at 0x%p", bytes, result);
1361 munmap(result, size);
1363 // Set a base address and try again... (guess: 1Gb)
1364 mmap_32bit_base = (void*)0x40000000;
1374 /* -----------------------------------------------------------------------------
1375 * Load an obj (populate the global symbol table, but don't resolve yet)
1377 * Returns: 1 if ok, 0 on error.
1380 loadObj( char *path )
1392 /* debugBelch("loadObj %s\n", path ); */
1394 /* Check that we haven't already loaded this object.
1395 Ignore requests to load multiple times */
1399 for (o = objects; o; o = o->next) {
1400 if (0 == strcmp(o->fileName, path)) {
1402 break; /* don't need to search further */
1406 IF_DEBUG(linker, debugBelch(
1407 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1408 "same object file twice:\n"
1410 "GHCi will ignore this, but be warned.\n"
1412 return 1; /* success */
1416 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1418 # if defined(OBJFORMAT_ELF)
1419 oc->formatName = "ELF";
1420 # elif defined(OBJFORMAT_PEi386)
1421 oc->formatName = "PEi386";
1422 # elif defined(OBJFORMAT_MACHO)
1423 oc->formatName = "Mach-O";
1426 barf("loadObj: not implemented on this platform");
1429 r = stat(path, &st);
1430 if (r == -1) { return 0; }
1432 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1433 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1434 strcpy(oc->fileName, path);
1436 oc->fileSize = st.st_size;
1438 oc->sections = NULL;
1439 oc->proddables = NULL;
1441 /* chain it onto the list of objects */
1446 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1448 #if defined(openbsd_HOST_OS)
1449 fd = open(path, O_RDONLY, S_IRUSR);
1451 fd = open(path, O_RDONLY);
1454 barf("loadObj: can't open `%s'", path);
1456 #ifdef ia64_HOST_ARCH
1457 /* The PLT needs to be right before the object */
1460 pagesize = getpagesize();
1461 n = ROUND_UP(PLTSize(), pagesize);
1462 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1463 if (oc->plt == MAP_FAILED)
1464 barf("loadObj: can't allocate PLT");
1467 map_addr = oc->plt + n;
1469 n = ROUND_UP(oc->fileSize, pagesize);
1470 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1471 MAP_PRIVATE|TRY_MAP_32BIT, fd, 0);
1472 if (oc->image == MAP_FAILED)
1473 barf("loadObj: can't map `%s'", path);
1476 oc->image = mmapForLinker(oc->fileSize, 0, fd);
1481 #else /* !USE_MMAP */
1482 /* load the image into memory */
1483 f = fopen(path, "rb");
1485 barf("loadObj: can't read `%s'", path);
1487 # if defined(mingw32_HOST_OS)
1488 // TODO: We would like to use allocateExec here, but allocateExec
1489 // cannot currently allocate blocks large enough.
1490 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1491 PAGE_EXECUTE_READWRITE);
1492 # elif defined(darwin_HOST_OS)
1493 // In a Mach-O .o file, all sections can and will be misaligned
1494 // if the total size of the headers is not a multiple of the
1495 // desired alignment. This is fine for .o files that only serve
1496 // as input for the static linker, but it's not fine for us,
1497 // as SSE (used by gcc for floating point) and Altivec require
1498 // 16-byte alignment.
1499 // We calculate the correct alignment from the header before
1500 // reading the file, and then we misalign oc->image on purpose so
1501 // that the actual sections end up aligned again.
1502 oc->misalignment = machoGetMisalignment(f);
1503 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1504 oc->image += oc->misalignment;
1506 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1511 n = fread ( oc->image, 1, oc->fileSize, f );
1512 if (n != oc->fileSize)
1513 barf("loadObj: error whilst reading `%s'", path);
1516 #endif /* USE_MMAP */
1518 # if defined(OBJFORMAT_MACHO) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1519 r = ocAllocateSymbolExtras_MachO ( oc );
1520 if (!r) { return r; }
1521 # elif defined(OBJFORMAT_ELF) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1522 r = ocAllocateSymbolExtras_ELF ( oc );
1523 if (!r) { return r; }
1526 /* verify the in-memory image */
1527 # if defined(OBJFORMAT_ELF)
1528 r = ocVerifyImage_ELF ( oc );
1529 # elif defined(OBJFORMAT_PEi386)
1530 r = ocVerifyImage_PEi386 ( oc );
1531 # elif defined(OBJFORMAT_MACHO)
1532 r = ocVerifyImage_MachO ( oc );
1534 barf("loadObj: no verify method");
1536 if (!r) { return r; }
1538 /* build the symbol list for this image */
1539 # if defined(OBJFORMAT_ELF)
1540 r = ocGetNames_ELF ( oc );
1541 # elif defined(OBJFORMAT_PEi386)
1542 r = ocGetNames_PEi386 ( oc );
1543 # elif defined(OBJFORMAT_MACHO)
1544 r = ocGetNames_MachO ( oc );
1546 barf("loadObj: no getNames method");
1548 if (!r) { return r; }
1550 /* loaded, but not resolved yet */
1551 oc->status = OBJECT_LOADED;
1556 /* -----------------------------------------------------------------------------
1557 * resolve all the currently unlinked objects in memory
1559 * Returns: 1 if ok, 0 on error.
1569 for (oc = objects; oc; oc = oc->next) {
1570 if (oc->status != OBJECT_RESOLVED) {
1571 # if defined(OBJFORMAT_ELF)
1572 r = ocResolve_ELF ( oc );
1573 # elif defined(OBJFORMAT_PEi386)
1574 r = ocResolve_PEi386 ( oc );
1575 # elif defined(OBJFORMAT_MACHO)
1576 r = ocResolve_MachO ( oc );
1578 barf("resolveObjs: not implemented on this platform");
1580 if (!r) { return r; }
1581 oc->status = OBJECT_RESOLVED;
1587 /* -----------------------------------------------------------------------------
1588 * delete an object from the pool
1591 unloadObj( char *path )
1593 ObjectCode *oc, *prev;
1595 ASSERT(symhash != NULL);
1596 ASSERT(objects != NULL);
1601 for (oc = objects; oc; prev = oc, oc = oc->next) {
1602 if (!strcmp(oc->fileName,path)) {
1604 /* Remove all the mappings for the symbols within this
1609 for (i = 0; i < oc->n_symbols; i++) {
1610 if (oc->symbols[i] != NULL) {
1611 removeStrHashTable(symhash, oc->symbols[i], NULL);
1619 prev->next = oc->next;
1622 // We're going to leave this in place, in case there are
1623 // any pointers from the heap into it:
1624 // #ifdef mingw32_HOST_OS
1625 // VirtualFree(oc->image);
1627 // stgFree(oc->image);
1629 stgFree(oc->fileName);
1630 stgFree(oc->symbols);
1631 stgFree(oc->sections);
1637 errorBelch("unloadObj: can't find `%s' to unload", path);
1641 /* -----------------------------------------------------------------------------
1642 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1643 * which may be prodded during relocation, and abort if we try and write
1644 * outside any of these.
1646 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1649 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1650 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1654 pb->next = oc->proddables;
1655 oc->proddables = pb;
1658 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1661 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1662 char* s = (char*)(pb->start);
1663 char* e = s + pb->size - 1;
1664 char* a = (char*)addr;
1665 /* Assumes that the biggest fixup involves a 4-byte write. This
1666 probably needs to be changed to 8 (ie, +7) on 64-bit
1668 if (a >= s && (a+3) <= e) return;
1670 barf("checkProddableBlock: invalid fixup in runtime linker");
1673 /* -----------------------------------------------------------------------------
1674 * Section management.
1676 static void addSection ( ObjectCode* oc, SectionKind kind,
1677 void* start, void* end )
1679 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1683 s->next = oc->sections;
1686 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1687 start, ((char*)end)-1, end - start + 1, kind );
1692 /* --------------------------------------------------------------------------
1694 * This is about allocating a small chunk of memory for every symbol in the
1695 * object file. We make sure that the SymboLExtras are always "in range" of
1696 * limited-range PC-relative instructions on various platforms by allocating
1697 * them right next to the object code itself.
1700 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
1703 ocAllocateSymbolExtras
1705 Allocate additional space at the end of the object file image to make room
1706 for jump islands (powerpc, x86_64) and GOT entries (x86_64).
1708 PowerPC relative branch instructions have a 24 bit displacement field.
1709 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1710 If a particular imported symbol is outside this range, we have to redirect
1711 the jump to a short piece of new code that just loads the 32bit absolute
1712 address and jumps there.
1713 On x86_64, PC-relative jumps and PC-relative accesses to the GOT are limited
1716 This function just allocates space for one SymbolExtra for every
1717 undefined symbol in the object file. The code for the jump islands is
1718 filled in by makeSymbolExtra below.
1721 static int ocAllocateSymbolExtras( ObjectCode* oc, int count, int first )
1728 int misalignment = 0;
1729 #ifdef darwin_HOST_OS
1730 misalignment = oc->misalignment;
1736 // round up to the nearest 4
1737 aligned = (oc->fileSize + 3) & ~3;
1740 pagesize = getpagesize();
1741 n = ROUND_UP( oc->fileSize, pagesize );
1742 m = ROUND_UP( aligned + sizeof (SymbolExtra) * count, pagesize );
1744 /* we try to use spare space at the end of the last page of the
1745 * image for the jump islands, but if there isn't enough space
1746 * then we have to map some (anonymously, remembering MAP_32BIT).
1748 if( m > n ) // we need to allocate more pages
1750 oc->symbol_extras = mmapForLinker(sizeof(SymbolExtra) * count,
1755 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1758 oc->image -= misalignment;
1759 oc->image = stgReallocBytes( oc->image,
1761 aligned + sizeof (SymbolExtra) * count,
1762 "ocAllocateSymbolExtras" );
1763 oc->image += misalignment;
1765 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1766 #endif /* USE_MMAP */
1768 memset( oc->symbol_extras, 0, sizeof (SymbolExtra) * count );
1771 oc->symbol_extras = NULL;
1773 oc->first_symbol_extra = first;
1774 oc->n_symbol_extras = count;
1779 static SymbolExtra* makeSymbolExtra( ObjectCode* oc,
1780 unsigned long symbolNumber,
1781 unsigned long target )
1785 ASSERT( symbolNumber >= oc->first_symbol_extra
1786 && symbolNumber - oc->first_symbol_extra < oc->n_symbol_extras);
1788 extra = &oc->symbol_extras[symbolNumber - oc->first_symbol_extra];
1790 #ifdef powerpc_HOST_ARCH
1791 // lis r12, hi16(target)
1792 extra->jumpIsland.lis_r12 = 0x3d80;
1793 extra->jumpIsland.hi_addr = target >> 16;
1795 // ori r12, r12, lo16(target)
1796 extra->jumpIsland.ori_r12_r12 = 0x618c;
1797 extra->jumpIsland.lo_addr = target & 0xffff;
1800 extra->jumpIsland.mtctr_r12 = 0x7d8903a6;
1803 extra->jumpIsland.bctr = 0x4e800420;
1805 #ifdef x86_64_HOST_ARCH
1807 static uint8_t jmp[] = { 0xFF, 0x25, 0xF2, 0xFF, 0xFF, 0xFF };
1808 extra->addr = target;
1809 memcpy(extra->jumpIsland, jmp, 6);
1817 /* --------------------------------------------------------------------------
1818 * PowerPC specifics (instruction cache flushing)
1819 * ------------------------------------------------------------------------*/
1821 #ifdef powerpc_TARGET_ARCH
1823 ocFlushInstructionCache
1825 Flush the data & instruction caches.
1826 Because the PPC has split data/instruction caches, we have to
1827 do that whenever we modify code at runtime.
1830 static void ocFlushInstructionCache( ObjectCode *oc )
1832 int n = (oc->fileSize + sizeof( SymbolExtra ) * oc->n_symbol_extras + 3) / 4;
1833 unsigned long *p = (unsigned long *) oc->image;
1837 __asm__ volatile ( "dcbf 0,%0\n\t"
1845 __asm__ volatile ( "sync\n\t"
1851 /* --------------------------------------------------------------------------
1852 * PEi386 specifics (Win32 targets)
1853 * ------------------------------------------------------------------------*/
1855 /* The information for this linker comes from
1856 Microsoft Portable Executable
1857 and Common Object File Format Specification
1858 revision 5.1 January 1998
1859 which SimonM says comes from the MS Developer Network CDs.
1861 It can be found there (on older CDs), but can also be found
1864 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1866 (this is Rev 6.0 from February 1999).
1868 Things move, so if that fails, try searching for it via
1870 http://www.google.com/search?q=PE+COFF+specification
1872 The ultimate reference for the PE format is the Winnt.h
1873 header file that comes with the Platform SDKs; as always,
1874 implementations will drift wrt their documentation.
1876 A good background article on the PE format is Matt Pietrek's
1877 March 1994 article in Microsoft System Journal (MSJ)
1878 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1879 Win32 Portable Executable File Format." The info in there
1880 has recently been updated in a two part article in
1881 MSDN magazine, issues Feb and March 2002,
1882 "Inside Windows: An In-Depth Look into the Win32 Portable
1883 Executable File Format"
1885 John Levine's book "Linkers and Loaders" contains useful
1890 #if defined(OBJFORMAT_PEi386)
1894 typedef unsigned char UChar;
1895 typedef unsigned short UInt16;
1896 typedef unsigned int UInt32;
1903 UInt16 NumberOfSections;
1904 UInt32 TimeDateStamp;
1905 UInt32 PointerToSymbolTable;
1906 UInt32 NumberOfSymbols;
1907 UInt16 SizeOfOptionalHeader;
1908 UInt16 Characteristics;
1912 #define sizeof_COFF_header 20
1919 UInt32 VirtualAddress;
1920 UInt32 SizeOfRawData;
1921 UInt32 PointerToRawData;
1922 UInt32 PointerToRelocations;
1923 UInt32 PointerToLinenumbers;
1924 UInt16 NumberOfRelocations;
1925 UInt16 NumberOfLineNumbers;
1926 UInt32 Characteristics;
1930 #define sizeof_COFF_section 40
1937 UInt16 SectionNumber;
1940 UChar NumberOfAuxSymbols;
1944 #define sizeof_COFF_symbol 18
1949 UInt32 VirtualAddress;
1950 UInt32 SymbolTableIndex;
1955 #define sizeof_COFF_reloc 10
1958 /* From PE spec doc, section 3.3.2 */
1959 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1960 windows.h -- for the same purpose, but I want to know what I'm
1962 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1963 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1964 #define MYIMAGE_FILE_DLL 0x2000
1965 #define MYIMAGE_FILE_SYSTEM 0x1000
1966 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1967 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1968 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1970 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1971 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1972 #define MYIMAGE_SYM_CLASS_STATIC 3
1973 #define MYIMAGE_SYM_UNDEFINED 0
1975 /* From PE spec doc, section 4.1 */
1976 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1977 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1978 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1980 /* From PE spec doc, section 5.2.1 */
1981 #define MYIMAGE_REL_I386_DIR32 0x0006
1982 #define MYIMAGE_REL_I386_REL32 0x0014
1985 /* We use myindex to calculate array addresses, rather than
1986 simply doing the normal subscript thing. That's because
1987 some of the above structs have sizes which are not
1988 a whole number of words. GCC rounds their sizes up to a
1989 whole number of words, which means that the address calcs
1990 arising from using normal C indexing or pointer arithmetic
1991 are just plain wrong. Sigh.
1994 myindex ( int scale, void* base, int index )
1997 ((UChar*)base) + scale * index;
2002 printName ( UChar* name, UChar* strtab )
2004 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2005 UInt32 strtab_offset = * (UInt32*)(name+4);
2006 debugBelch("%s", strtab + strtab_offset );
2009 for (i = 0; i < 8; i++) {
2010 if (name[i] == 0) break;
2011 debugBelch("%c", name[i] );
2018 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
2020 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2021 UInt32 strtab_offset = * (UInt32*)(name+4);
2022 strncpy ( dst, strtab+strtab_offset, dstSize );
2028 if (name[i] == 0) break;
2038 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
2041 /* If the string is longer than 8 bytes, look in the
2042 string table for it -- this will be correctly zero terminated.
2044 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2045 UInt32 strtab_offset = * (UInt32*)(name+4);
2046 return ((UChar*)strtab) + strtab_offset;
2048 /* Otherwise, if shorter than 8 bytes, return the original,
2049 which by defn is correctly terminated.
2051 if (name[7]==0) return name;
2052 /* The annoying case: 8 bytes. Copy into a temporary
2053 (which is never freed ...)
2055 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
2057 strncpy(newstr,name,8);
2063 /* Just compares the short names (first 8 chars) */
2064 static COFF_section *
2065 findPEi386SectionCalled ( ObjectCode* oc, char* name )
2069 = (COFF_header*)(oc->image);
2070 COFF_section* sectab
2072 ((UChar*)(oc->image))
2073 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2075 for (i = 0; i < hdr->NumberOfSections; i++) {
2078 COFF_section* section_i
2080 myindex ( sizeof_COFF_section, sectab, i );
2081 n1 = (UChar*) &(section_i->Name);
2083 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
2084 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
2085 n1[6]==n2[6] && n1[7]==n2[7])
2094 zapTrailingAtSign ( UChar* sym )
2096 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
2098 if (sym[0] == 0) return;
2100 while (sym[i] != 0) i++;
2103 while (j > 0 && my_isdigit(sym[j])) j--;
2104 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
2109 lookupSymbolInDLLs ( UChar *lbl )
2114 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
2115 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
2117 if (lbl[0] == '_') {
2118 /* HACK: if the name has an initial underscore, try stripping
2119 it off & look that up first. I've yet to verify whether there's
2120 a Rule that governs whether an initial '_' *should always* be
2121 stripped off when mapping from import lib name to the DLL name.
2123 sym = GetProcAddress(o_dll->instance, (lbl+1));
2125 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
2129 sym = GetProcAddress(o_dll->instance, lbl);
2131 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
2140 ocVerifyImage_PEi386 ( ObjectCode* oc )
2145 COFF_section* sectab;
2146 COFF_symbol* symtab;
2148 /* debugBelch("\nLOADING %s\n", oc->fileName); */
2149 hdr = (COFF_header*)(oc->image);
2150 sectab = (COFF_section*) (
2151 ((UChar*)(oc->image))
2152 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2154 symtab = (COFF_symbol*) (
2155 ((UChar*)(oc->image))
2156 + hdr->PointerToSymbolTable
2158 strtab = ((UChar*)symtab)
2159 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2161 if (hdr->Machine != 0x14c) {
2162 errorBelch("%s: Not x86 PEi386", oc->fileName);
2165 if (hdr->SizeOfOptionalHeader != 0) {
2166 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2169 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2170 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2171 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2172 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2173 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2176 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2177 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2178 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2180 (int)(hdr->Characteristics));
2183 /* If the string table size is way crazy, this might indicate that
2184 there are more than 64k relocations, despite claims to the
2185 contrary. Hence this test. */
2186 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2188 if ( (*(UInt32*)strtab) > 600000 ) {
2189 /* Note that 600k has no special significance other than being
2190 big enough to handle the almost-2MB-sized lumps that
2191 constitute HSwin32*.o. */
2192 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2197 /* No further verification after this point; only debug printing. */
2199 IF_DEBUG(linker, i=1);
2200 if (i == 0) return 1;
2202 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2203 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2204 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2207 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2208 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2209 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2210 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2211 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2212 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2213 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2215 /* Print the section table. */
2217 for (i = 0; i < hdr->NumberOfSections; i++) {
2219 COFF_section* sectab_i
2221 myindex ( sizeof_COFF_section, sectab, i );
2228 printName ( sectab_i->Name, strtab );
2238 sectab_i->VirtualSize,
2239 sectab_i->VirtualAddress,
2240 sectab_i->SizeOfRawData,
2241 sectab_i->PointerToRawData,
2242 sectab_i->NumberOfRelocations,
2243 sectab_i->PointerToRelocations,
2244 sectab_i->PointerToRawData
2246 reltab = (COFF_reloc*) (
2247 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2250 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2251 /* If the relocation field (a short) has overflowed, the
2252 * real count can be found in the first reloc entry.
2254 * See Section 4.1 (last para) of the PE spec (rev6.0).
2256 COFF_reloc* rel = (COFF_reloc*)
2257 myindex ( sizeof_COFF_reloc, reltab, 0 );
2258 noRelocs = rel->VirtualAddress;
2261 noRelocs = sectab_i->NumberOfRelocations;
2265 for (; j < noRelocs; j++) {
2267 COFF_reloc* rel = (COFF_reloc*)
2268 myindex ( sizeof_COFF_reloc, reltab, j );
2270 " type 0x%-4x vaddr 0x%-8x name `",
2272 rel->VirtualAddress );
2273 sym = (COFF_symbol*)
2274 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2275 /* Hmm..mysterious looking offset - what's it for? SOF */
2276 printName ( sym->Name, strtab -10 );
2283 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2284 debugBelch("---START of string table---\n");
2285 for (i = 4; i < *(Int32*)strtab; i++) {
2287 debugBelch("\n"); else
2288 debugBelch("%c", strtab[i] );
2290 debugBelch("--- END of string table---\n");
2295 COFF_symbol* symtab_i;
2296 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2297 symtab_i = (COFF_symbol*)
2298 myindex ( sizeof_COFF_symbol, symtab, i );
2304 printName ( symtab_i->Name, strtab );
2313 (Int32)(symtab_i->SectionNumber),
2314 (UInt32)symtab_i->Type,
2315 (UInt32)symtab_i->StorageClass,
2316 (UInt32)symtab_i->NumberOfAuxSymbols
2318 i += symtab_i->NumberOfAuxSymbols;
2328 ocGetNames_PEi386 ( ObjectCode* oc )
2331 COFF_section* sectab;
2332 COFF_symbol* symtab;
2339 hdr = (COFF_header*)(oc->image);
2340 sectab = (COFF_section*) (
2341 ((UChar*)(oc->image))
2342 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2344 symtab = (COFF_symbol*) (
2345 ((UChar*)(oc->image))
2346 + hdr->PointerToSymbolTable
2348 strtab = ((UChar*)(oc->image))
2349 + hdr->PointerToSymbolTable
2350 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2352 /* Allocate space for any (local, anonymous) .bss sections. */
2354 for (i = 0; i < hdr->NumberOfSections; i++) {
2357 COFF_section* sectab_i
2359 myindex ( sizeof_COFF_section, sectab, i );
2360 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2361 /* sof 10/05: the PE spec text isn't too clear regarding what
2362 * the SizeOfRawData field is supposed to hold for object
2363 * file sections containing just uninitialized data -- for executables,
2364 * it is supposed to be zero; unclear what it's supposed to be
2365 * for object files. However, VirtualSize is guaranteed to be
2366 * zero for object files, which definitely suggests that SizeOfRawData
2367 * will be non-zero (where else would the size of this .bss section be
2368 * stored?) Looking at the COFF_section info for incoming object files,
2369 * this certainly appears to be the case.
2371 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2372 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2373 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2374 * variable decls into to the .bss section. (The specific function in Q which
2375 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2377 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2378 /* This is a non-empty .bss section. Allocate zeroed space for
2379 it, and set its PointerToRawData field such that oc->image +
2380 PointerToRawData == addr_of_zeroed_space. */
2381 bss_sz = sectab_i->VirtualSize;
2382 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2383 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2384 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2385 addProddableBlock(oc, zspace, bss_sz);
2386 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2389 /* Copy section information into the ObjectCode. */
2391 for (i = 0; i < hdr->NumberOfSections; i++) {
2397 = SECTIONKIND_OTHER;
2398 COFF_section* sectab_i
2400 myindex ( sizeof_COFF_section, sectab, i );
2401 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2404 /* I'm sure this is the Right Way to do it. However, the
2405 alternative of testing the sectab_i->Name field seems to
2406 work ok with Cygwin.
2408 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2409 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2410 kind = SECTIONKIND_CODE_OR_RODATA;
2413 if (0==strcmp(".text",sectab_i->Name) ||
2414 0==strcmp(".rdata",sectab_i->Name)||
2415 0==strcmp(".rodata",sectab_i->Name))
2416 kind = SECTIONKIND_CODE_OR_RODATA;
2417 if (0==strcmp(".data",sectab_i->Name) ||
2418 0==strcmp(".bss",sectab_i->Name))
2419 kind = SECTIONKIND_RWDATA;
2421 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2422 sz = sectab_i->SizeOfRawData;
2423 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2425 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2426 end = start + sz - 1;
2428 if (kind == SECTIONKIND_OTHER
2429 /* Ignore sections called which contain stabs debugging
2431 && 0 != strcmp(".stab", sectab_i->Name)
2432 && 0 != strcmp(".stabstr", sectab_i->Name)
2433 /* ignore constructor section for now */
2434 && 0 != strcmp(".ctors", sectab_i->Name)
2435 /* ignore section generated from .ident */
2436 && 0!= strcmp("/4", sectab_i->Name)
2437 /* ignore unknown section that appeared in gcc 3.4.5(?) */
2438 && 0!= strcmp(".reloc", sectab_i->Name)
2440 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2444 if (kind != SECTIONKIND_OTHER && end >= start) {
2445 addSection(oc, kind, start, end);
2446 addProddableBlock(oc, start, end - start + 1);
2450 /* Copy exported symbols into the ObjectCode. */
2452 oc->n_symbols = hdr->NumberOfSymbols;
2453 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2454 "ocGetNames_PEi386(oc->symbols)");
2455 /* Call me paranoid; I don't care. */
2456 for (i = 0; i < oc->n_symbols; i++)
2457 oc->symbols[i] = NULL;
2461 COFF_symbol* symtab_i;
2462 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2463 symtab_i = (COFF_symbol*)
2464 myindex ( sizeof_COFF_symbol, symtab, i );
2468 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2469 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2470 /* This symbol is global and defined, viz, exported */
2471 /* for MYIMAGE_SYMCLASS_EXTERNAL
2472 && !MYIMAGE_SYM_UNDEFINED,
2473 the address of the symbol is:
2474 address of relevant section + offset in section
2476 COFF_section* sectabent
2477 = (COFF_section*) myindex ( sizeof_COFF_section,
2479 symtab_i->SectionNumber-1 );
2480 addr = ((UChar*)(oc->image))
2481 + (sectabent->PointerToRawData
2485 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2486 && symtab_i->Value > 0) {
2487 /* This symbol isn't in any section at all, ie, global bss.
2488 Allocate zeroed space for it. */
2489 addr = stgCallocBytes(1, symtab_i->Value,
2490 "ocGetNames_PEi386(non-anonymous bss)");
2491 addSection(oc, SECTIONKIND_RWDATA, addr,
2492 ((UChar*)addr) + symtab_i->Value - 1);
2493 addProddableBlock(oc, addr, symtab_i->Value);
2494 /* debugBelch("BSS section at 0x%x\n", addr); */
2497 if (addr != NULL ) {
2498 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2499 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2500 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2501 ASSERT(i >= 0 && i < oc->n_symbols);
2502 /* cstring_from_COFF_symbol_name always succeeds. */
2503 oc->symbols[i] = sname;
2504 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2508 "IGNORING symbol %d\n"
2512 printName ( symtab_i->Name, strtab );
2521 (Int32)(symtab_i->SectionNumber),
2522 (UInt32)symtab_i->Type,
2523 (UInt32)symtab_i->StorageClass,
2524 (UInt32)symtab_i->NumberOfAuxSymbols
2529 i += symtab_i->NumberOfAuxSymbols;
2538 ocResolve_PEi386 ( ObjectCode* oc )
2541 COFF_section* sectab;
2542 COFF_symbol* symtab;
2552 /* ToDo: should be variable-sized? But is at least safe in the
2553 sense of buffer-overrun-proof. */
2555 /* debugBelch("resolving for %s\n", oc->fileName); */
2557 hdr = (COFF_header*)(oc->image);
2558 sectab = (COFF_section*) (
2559 ((UChar*)(oc->image))
2560 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2562 symtab = (COFF_symbol*) (
2563 ((UChar*)(oc->image))
2564 + hdr->PointerToSymbolTable
2566 strtab = ((UChar*)(oc->image))
2567 + hdr->PointerToSymbolTable
2568 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2570 for (i = 0; i < hdr->NumberOfSections; i++) {
2571 COFF_section* sectab_i
2573 myindex ( sizeof_COFF_section, sectab, i );
2576 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2579 /* Ignore sections called which contain stabs debugging
2581 if (0 == strcmp(".stab", sectab_i->Name)
2582 || 0 == strcmp(".stabstr", sectab_i->Name)
2583 || 0 == strcmp(".ctors", sectab_i->Name))
2586 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2587 /* If the relocation field (a short) has overflowed, the
2588 * real count can be found in the first reloc entry.
2590 * See Section 4.1 (last para) of the PE spec (rev6.0).
2592 * Nov2003 update: the GNU linker still doesn't correctly
2593 * handle the generation of relocatable object files with
2594 * overflown relocations. Hence the output to warn of potential
2597 COFF_reloc* rel = (COFF_reloc*)
2598 myindex ( sizeof_COFF_reloc, reltab, 0 );
2599 noRelocs = rel->VirtualAddress;
2601 /* 10/05: we now assume (and check for) a GNU ld that is capable
2602 * of handling object files with (>2^16) of relocs.
2605 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2610 noRelocs = sectab_i->NumberOfRelocations;
2615 for (; j < noRelocs; j++) {
2617 COFF_reloc* reltab_j
2619 myindex ( sizeof_COFF_reloc, reltab, j );
2621 /* the location to patch */
2623 ((UChar*)(oc->image))
2624 + (sectab_i->PointerToRawData
2625 + reltab_j->VirtualAddress
2626 - sectab_i->VirtualAddress )
2628 /* the existing contents of pP */
2630 /* the symbol to connect to */
2631 sym = (COFF_symbol*)
2632 myindex ( sizeof_COFF_symbol,
2633 symtab, reltab_j->SymbolTableIndex );
2636 "reloc sec %2d num %3d: type 0x%-4x "
2637 "vaddr 0x%-8x name `",
2639 (UInt32)reltab_j->Type,
2640 reltab_j->VirtualAddress );
2641 printName ( sym->Name, strtab );
2642 debugBelch("'\n" ));
2644 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2645 COFF_section* section_sym
2646 = findPEi386SectionCalled ( oc, sym->Name );
2648 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2651 S = ((UInt32)(oc->image))
2652 + (section_sym->PointerToRawData
2655 copyName ( sym->Name, strtab, symbol, 1000-1 );
2656 S = (UInt32) lookupSymbol( symbol );
2657 if ((void*)S != NULL) goto foundit;
2658 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
2662 checkProddableBlock(oc, pP);
2663 switch (reltab_j->Type) {
2664 case MYIMAGE_REL_I386_DIR32:
2667 case MYIMAGE_REL_I386_REL32:
2668 /* Tricky. We have to insert a displacement at
2669 pP which, when added to the PC for the _next_
2670 insn, gives the address of the target (S).
2671 Problem is to know the address of the next insn
2672 when we only know pP. We assume that this
2673 literal field is always the last in the insn,
2674 so that the address of the next insn is pP+4
2675 -- hence the constant 4.
2676 Also I don't know if A should be added, but so
2677 far it has always been zero.
2679 SOF 05/2005: 'A' (old contents of *pP) have been observed
2680 to contain values other than zero (the 'wx' object file
2681 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2682 So, add displacement to old value instead of asserting
2683 A to be zero. Fixes wxhaskell-related crashes, and no other
2684 ill effects have been observed.
2686 Update: the reason why we're seeing these more elaborate
2687 relocations is due to a switch in how the NCG compiles SRTs
2688 and offsets to them from info tables. SRTs live in .(ro)data,
2689 while info tables live in .text, causing GAS to emit REL32/DISP32
2690 relocations with non-zero values. Adding the displacement is
2691 the right thing to do.
2693 *pP = S - ((UInt32)pP) - 4 + A;
2696 debugBelch("%s: unhandled PEi386 relocation type %d",
2697 oc->fileName, reltab_j->Type);
2704 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2708 #endif /* defined(OBJFORMAT_PEi386) */
2711 /* --------------------------------------------------------------------------
2713 * ------------------------------------------------------------------------*/
2715 #if defined(OBJFORMAT_ELF)
2720 #if defined(sparc_HOST_ARCH)
2721 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2722 #elif defined(i386_HOST_ARCH)
2723 # define ELF_TARGET_386 /* Used inside <elf.h> */
2724 #elif defined(x86_64_HOST_ARCH)
2725 # define ELF_TARGET_X64_64
2727 #elif defined (ia64_HOST_ARCH)
2728 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2730 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2731 # define ELF_NEED_GOT /* needs Global Offset Table */
2732 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2735 #if !defined(openbsd_HOST_OS)
2738 /* openbsd elf has things in different places, with diff names */
2739 # include <elf_abi.h>
2740 # include <machine/reloc.h>
2741 # define R_386_32 RELOC_32
2742 # define R_386_PC32 RELOC_PC32
2745 /* If elf.h doesn't define it */
2746 # ifndef R_X86_64_PC64
2747 # define R_X86_64_PC64 24
2751 * Define a set of types which can be used for both ELF32 and ELF64
2755 #define ELFCLASS ELFCLASS64
2756 #define Elf_Addr Elf64_Addr
2757 #define Elf_Word Elf64_Word
2758 #define Elf_Sword Elf64_Sword
2759 #define Elf_Ehdr Elf64_Ehdr
2760 #define Elf_Phdr Elf64_Phdr
2761 #define Elf_Shdr Elf64_Shdr
2762 #define Elf_Sym Elf64_Sym
2763 #define Elf_Rel Elf64_Rel
2764 #define Elf_Rela Elf64_Rela
2765 #define ELF_ST_TYPE ELF64_ST_TYPE
2766 #define ELF_ST_BIND ELF64_ST_BIND
2767 #define ELF_R_TYPE ELF64_R_TYPE
2768 #define ELF_R_SYM ELF64_R_SYM
2770 #define ELFCLASS ELFCLASS32
2771 #define Elf_Addr Elf32_Addr
2772 #define Elf_Word Elf32_Word
2773 #define Elf_Sword Elf32_Sword
2774 #define Elf_Ehdr Elf32_Ehdr
2775 #define Elf_Phdr Elf32_Phdr
2776 #define Elf_Shdr Elf32_Shdr
2777 #define Elf_Sym Elf32_Sym
2778 #define Elf_Rel Elf32_Rel
2779 #define Elf_Rela Elf32_Rela
2781 #define ELF_ST_TYPE ELF32_ST_TYPE
2784 #define ELF_ST_BIND ELF32_ST_BIND
2787 #define ELF_R_TYPE ELF32_R_TYPE
2790 #define ELF_R_SYM ELF32_R_SYM
2796 * Functions to allocate entries in dynamic sections. Currently we simply
2797 * preallocate a large number, and we don't check if a entry for the given
2798 * target already exists (a linear search is too slow). Ideally these
2799 * entries would be associated with symbols.
2802 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2803 #define GOT_SIZE 0x20000
2804 #define FUNCTION_TABLE_SIZE 0x10000
2805 #define PLT_SIZE 0x08000
2808 static Elf_Addr got[GOT_SIZE];
2809 static unsigned int gotIndex;
2810 static Elf_Addr gp_val = (Elf_Addr)got;
2813 allocateGOTEntry(Elf_Addr target)
2817 if (gotIndex >= GOT_SIZE)
2818 barf("Global offset table overflow");
2820 entry = &got[gotIndex++];
2822 return (Elf_Addr)entry;
2826 #ifdef ELF_FUNCTION_DESC
2832 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2833 static unsigned int functionTableIndex;
2836 allocateFunctionDesc(Elf_Addr target)
2838 FunctionDesc *entry;
2840 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2841 barf("Function table overflow");
2843 entry = &functionTable[functionTableIndex++];
2845 entry->gp = (Elf_Addr)gp_val;
2846 return (Elf_Addr)entry;
2850 copyFunctionDesc(Elf_Addr target)
2852 FunctionDesc *olddesc = (FunctionDesc *)target;
2853 FunctionDesc *newdesc;
2855 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2856 newdesc->gp = olddesc->gp;
2857 return (Elf_Addr)newdesc;
2862 #ifdef ia64_HOST_ARCH
2863 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2864 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2866 static unsigned char plt_code[] =
2868 /* taken from binutils bfd/elfxx-ia64.c */
2869 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2870 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2871 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2872 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2873 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2874 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2877 /* If we can't get to the function descriptor via gp, take a local copy of it */
2878 #define PLT_RELOC(code, target) { \
2879 Elf64_Sxword rel_value = target - gp_val; \
2880 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2881 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2883 ia64_reloc_gprel22((Elf_Addr)code, target); \
2888 unsigned char code[sizeof(plt_code)];
2892 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2894 PLTEntry *plt = (PLTEntry *)oc->plt;
2897 if (oc->pltIndex >= PLT_SIZE)
2898 barf("Procedure table overflow");
2900 entry = &plt[oc->pltIndex++];
2901 memcpy(entry->code, plt_code, sizeof(entry->code));
2902 PLT_RELOC(entry->code, target);
2903 return (Elf_Addr)entry;
2909 return (PLT_SIZE * sizeof(PLTEntry));
2915 * Generic ELF functions
2919 findElfSection ( void* objImage, Elf_Word sh_type )
2921 char* ehdrC = (char*)objImage;
2922 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2923 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2924 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2928 for (i = 0; i < ehdr->e_shnum; i++) {
2929 if (shdr[i].sh_type == sh_type
2930 /* Ignore the section header's string table. */
2931 && i != ehdr->e_shstrndx
2932 /* Ignore string tables named .stabstr, as they contain
2934 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2936 ptr = ehdrC + shdr[i].sh_offset;
2943 #if defined(ia64_HOST_ARCH)
2945 findElfSegment ( void* objImage, Elf_Addr vaddr )
2947 char* ehdrC = (char*)objImage;
2948 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2949 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2950 Elf_Addr segaddr = 0;
2953 for (i = 0; i < ehdr->e_phnum; i++) {
2954 segaddr = phdr[i].p_vaddr;
2955 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2963 ocVerifyImage_ELF ( ObjectCode* oc )
2967 int i, j, nent, nstrtab, nsymtabs;
2971 char* ehdrC = (char*)(oc->image);
2972 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2974 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2975 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2976 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2977 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2978 errorBelch("%s: not an ELF object", oc->fileName);
2982 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2983 errorBelch("%s: unsupported ELF format", oc->fileName);
2987 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2988 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2990 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2991 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2993 errorBelch("%s: unknown endiannness", oc->fileName);
2997 if (ehdr->e_type != ET_REL) {
2998 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
3001 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
3003 IF_DEBUG(linker,debugBelch( "Architecture is " ));
3004 switch (ehdr->e_machine) {
3005 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
3006 #ifdef EM_SPARC32PLUS
3007 case EM_SPARC32PLUS:
3009 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
3011 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
3013 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
3015 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
3016 #elif defined(EM_AMD64)
3017 case EM_AMD64: IF_DEBUG(linker,debugBelch( "amd64" )); break;
3019 default: IF_DEBUG(linker,debugBelch( "unknown" ));
3020 errorBelch("%s: unknown architecture (e_machine == %d)"
3021 , oc->fileName, ehdr->e_machine);
3025 IF_DEBUG(linker,debugBelch(
3026 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
3027 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
3029 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
3031 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3033 if (ehdr->e_shstrndx == SHN_UNDEF) {
3034 errorBelch("%s: no section header string table", oc->fileName);
3037 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
3039 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
3042 for (i = 0; i < ehdr->e_shnum; i++) {
3043 IF_DEBUG(linker,debugBelch("%2d: ", i ));
3044 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
3045 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
3046 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
3047 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
3048 ehdrC + shdr[i].sh_offset,
3049 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
3051 if (shdr[i].sh_type == SHT_REL) {
3052 IF_DEBUG(linker,debugBelch("Rel " ));
3053 } else if (shdr[i].sh_type == SHT_RELA) {
3054 IF_DEBUG(linker,debugBelch("RelA " ));
3056 IF_DEBUG(linker,debugBelch(" "));
3059 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
3063 IF_DEBUG(linker,debugBelch( "\nString tables" ));
3066 for (i = 0; i < ehdr->e_shnum; i++) {
3067 if (shdr[i].sh_type == SHT_STRTAB
3068 /* Ignore the section header's string table. */
3069 && i != ehdr->e_shstrndx
3070 /* Ignore string tables named .stabstr, as they contain
3072 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
3074 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
3075 strtab = ehdrC + shdr[i].sh_offset;
3080 errorBelch("%s: no string tables, or too many", oc->fileName);
3085 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
3086 for (i = 0; i < ehdr->e_shnum; i++) {
3087 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3088 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
3090 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3091 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3092 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
3094 (long)shdr[i].sh_size % sizeof(Elf_Sym)
3096 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
3097 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
3100 for (j = 0; j < nent; j++) {
3101 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3102 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3103 (int)stab[j].st_shndx,
3104 (int)stab[j].st_size,
3105 (char*)stab[j].st_value ));
3107 IF_DEBUG(linker,debugBelch("type=" ));
3108 switch (ELF_ST_TYPE(stab[j].st_info)) {
3109 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3110 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3111 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3112 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3113 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3114 default: IF_DEBUG(linker,debugBelch("? " )); break;
3116 IF_DEBUG(linker,debugBelch(" " ));
3118 IF_DEBUG(linker,debugBelch("bind=" ));
3119 switch (ELF_ST_BIND(stab[j].st_info)) {
3120 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3121 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3122 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3123 default: IF_DEBUG(linker,debugBelch("? " )); break;
3125 IF_DEBUG(linker,debugBelch(" " ));
3127 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3131 if (nsymtabs == 0) {
3132 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3139 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3143 if (hdr->sh_type == SHT_PROGBITS
3144 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3145 /* .text-style section */
3146 return SECTIONKIND_CODE_OR_RODATA;
3149 if (hdr->sh_type == SHT_PROGBITS
3150 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3151 /* .data-style section */
3152 return SECTIONKIND_RWDATA;
3155 if (hdr->sh_type == SHT_PROGBITS
3156 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3157 /* .rodata-style section */
3158 return SECTIONKIND_CODE_OR_RODATA;
3161 if (hdr->sh_type == SHT_NOBITS
3162 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3163 /* .bss-style section */
3165 return SECTIONKIND_RWDATA;
3168 return SECTIONKIND_OTHER;
3173 ocGetNames_ELF ( ObjectCode* oc )
3178 char* ehdrC = (char*)(oc->image);
3179 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3180 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3181 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3183 ASSERT(symhash != NULL);
3186 errorBelch("%s: no strtab", oc->fileName);
3191 for (i = 0; i < ehdr->e_shnum; i++) {
3192 /* Figure out what kind of section it is. Logic derived from
3193 Figure 1.14 ("Special Sections") of the ELF document
3194 ("Portable Formats Specification, Version 1.1"). */
3196 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3198 if (is_bss && shdr[i].sh_size > 0) {
3199 /* This is a non-empty .bss section. Allocate zeroed space for
3200 it, and set its .sh_offset field such that
3201 ehdrC + .sh_offset == addr_of_zeroed_space. */
3202 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3203 "ocGetNames_ELF(BSS)");
3204 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3206 debugBelch("BSS section at 0x%x, size %d\n",
3207 zspace, shdr[i].sh_size);
3211 /* fill in the section info */
3212 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3213 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3214 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3215 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3218 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3220 /* copy stuff into this module's object symbol table */
3221 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3222 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3224 oc->n_symbols = nent;
3225 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3226 "ocGetNames_ELF(oc->symbols)");
3228 for (j = 0; j < nent; j++) {
3230 char isLocal = FALSE; /* avoids uninit-var warning */
3232 char* nm = strtab + stab[j].st_name;
3233 int secno = stab[j].st_shndx;
3235 /* Figure out if we want to add it; if so, set ad to its
3236 address. Otherwise leave ad == NULL. */
3238 if (secno == SHN_COMMON) {
3240 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3242 debugBelch("COMMON symbol, size %d name %s\n",
3243 stab[j].st_size, nm);
3245 /* Pointless to do addProddableBlock() for this area,
3246 since the linker should never poke around in it. */
3249 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3250 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3252 /* and not an undefined symbol */
3253 && stab[j].st_shndx != SHN_UNDEF
3254 /* and not in a "special section" */
3255 && stab[j].st_shndx < SHN_LORESERVE
3257 /* and it's a not a section or string table or anything silly */
3258 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3259 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3260 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3263 /* Section 0 is the undefined section, hence > and not >=. */
3264 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3266 if (shdr[secno].sh_type == SHT_NOBITS) {
3267 debugBelch(" BSS symbol, size %d off %d name %s\n",
3268 stab[j].st_size, stab[j].st_value, nm);
3271 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3272 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3275 #ifdef ELF_FUNCTION_DESC
3276 /* dlsym() and the initialisation table both give us function
3277 * descriptors, so to be consistent we store function descriptors
3278 * in the symbol table */
3279 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3280 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3282 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s\n",
3283 ad, oc->fileName, nm ));
3288 /* And the decision is ... */
3292 oc->symbols[j] = nm;
3295 /* Ignore entirely. */
3297 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3301 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3302 strtab + stab[j].st_name ));
3305 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3306 (int)ELF_ST_BIND(stab[j].st_info),
3307 (int)ELF_ST_TYPE(stab[j].st_info),
3308 (int)stab[j].st_shndx,
3309 strtab + stab[j].st_name
3312 oc->symbols[j] = NULL;
3321 /* Do ELF relocations which lack an explicit addend. All x86-linux
3322 relocations appear to be of this form. */
3324 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3325 Elf_Shdr* shdr, int shnum,
3326 Elf_Sym* stab, char* strtab )
3331 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3332 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3333 int target_shndx = shdr[shnum].sh_info;
3334 int symtab_shndx = shdr[shnum].sh_link;
3336 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3337 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3338 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3339 target_shndx, symtab_shndx ));
3341 /* Skip sections that we're not interested in. */
3344 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3345 if (kind == SECTIONKIND_OTHER) {
3346 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3351 for (j = 0; j < nent; j++) {
3352 Elf_Addr offset = rtab[j].r_offset;
3353 Elf_Addr info = rtab[j].r_info;
3355 Elf_Addr P = ((Elf_Addr)targ) + offset;
3356 Elf_Word* pP = (Elf_Word*)P;
3361 StgStablePtr stablePtr;
3364 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3365 j, (void*)offset, (void*)info ));
3367 IF_DEBUG(linker,debugBelch( " ZERO" ));
3370 Elf_Sym sym = stab[ELF_R_SYM(info)];
3371 /* First see if it is a local symbol. */
3372 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3373 /* Yes, so we can get the address directly from the ELF symbol
3375 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3377 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3378 + stab[ELF_R_SYM(info)].st_value);
3381 symbol = strtab + sym.st_name;
3382 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3383 if (NULL == stablePtr) {
3384 /* No, so look up the name in our global table. */
3385 S_tmp = lookupSymbol( symbol );
3386 S = (Elf_Addr)S_tmp;
3388 stableVal = deRefStablePtr( stablePtr );
3390 S = (Elf_Addr)S_tmp;
3394 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3397 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3400 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3401 (void*)P, (void*)S, (void*)A ));
3402 checkProddableBlock ( oc, pP );
3406 switch (ELF_R_TYPE(info)) {
3407 # ifdef i386_HOST_ARCH
3408 case R_386_32: *pP = value; break;
3409 case R_386_PC32: *pP = value - P; break;
3412 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3413 oc->fileName, (lnat)ELF_R_TYPE(info));
3421 /* Do ELF relocations for which explicit addends are supplied.
3422 sparc-solaris relocations appear to be of this form. */
3424 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3425 Elf_Shdr* shdr, int shnum,
3426 Elf_Sym* stab, char* strtab )
3429 char *symbol = NULL;
3431 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3432 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3433 int target_shndx = shdr[shnum].sh_info;
3434 int symtab_shndx = shdr[shnum].sh_link;
3436 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3437 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3438 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3439 target_shndx, symtab_shndx ));
3441 for (j = 0; j < nent; j++) {
3442 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3443 /* This #ifdef only serves to avoid unused-var warnings. */
3444 Elf_Addr offset = rtab[j].r_offset;
3445 Elf_Addr P = targ + offset;
3447 Elf_Addr info = rtab[j].r_info;
3448 Elf_Addr A = rtab[j].r_addend;
3452 # if defined(sparc_HOST_ARCH)
3453 Elf_Word* pP = (Elf_Word*)P;
3455 # elif defined(ia64_HOST_ARCH)
3456 Elf64_Xword *pP = (Elf64_Xword *)P;
3458 # elif defined(powerpc_HOST_ARCH)
3462 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3463 j, (void*)offset, (void*)info,
3466 IF_DEBUG(linker,debugBelch( " ZERO" ));
3469 Elf_Sym sym = stab[ELF_R_SYM(info)];
3470 /* First see if it is a local symbol. */
3471 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3472 /* Yes, so we can get the address directly from the ELF symbol
3474 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3476 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3477 + stab[ELF_R_SYM(info)].st_value);
3478 #ifdef ELF_FUNCTION_DESC
3479 /* Make a function descriptor for this function */
3480 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3481 S = allocateFunctionDesc(S + A);
3486 /* No, so look up the name in our global table. */
3487 symbol = strtab + sym.st_name;
3488 S_tmp = lookupSymbol( symbol );
3489 S = (Elf_Addr)S_tmp;
3491 #ifdef ELF_FUNCTION_DESC
3492 /* If a function, already a function descriptor - we would
3493 have to copy it to add an offset. */
3494 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3495 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3499 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3502 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3505 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3506 (void*)P, (void*)S, (void*)A ));
3507 /* checkProddableBlock ( oc, (void*)P ); */
3511 switch (ELF_R_TYPE(info)) {
3512 # if defined(sparc_HOST_ARCH)
3513 case R_SPARC_WDISP30:
3514 w1 = *pP & 0xC0000000;
3515 w2 = (Elf_Word)((value - P) >> 2);
3516 ASSERT((w2 & 0xC0000000) == 0);
3521 w1 = *pP & 0xFFC00000;
3522 w2 = (Elf_Word)(value >> 10);
3523 ASSERT((w2 & 0xFFC00000) == 0);
3529 w2 = (Elf_Word)(value & 0x3FF);
3530 ASSERT((w2 & ~0x3FF) == 0);
3534 /* According to the Sun documentation:
3536 This relocation type resembles R_SPARC_32, except it refers to an
3537 unaligned word. That is, the word to be relocated must be treated
3538 as four separate bytes with arbitrary alignment, not as a word
3539 aligned according to the architecture requirements.
3541 (JRS: which means that freeloading on the R_SPARC_32 case
3542 is probably wrong, but hey ...)
3546 w2 = (Elf_Word)value;
3549 # elif defined(ia64_HOST_ARCH)
3550 case R_IA64_DIR64LSB:
3551 case R_IA64_FPTR64LSB:
3554 case R_IA64_PCREL64LSB:
3557 case R_IA64_SEGREL64LSB:
3558 addr = findElfSegment(ehdrC, value);
3561 case R_IA64_GPREL22:
3562 ia64_reloc_gprel22(P, value);
3564 case R_IA64_LTOFF22:
3565 case R_IA64_LTOFF22X:
3566 case R_IA64_LTOFF_FPTR22:
3567 addr = allocateGOTEntry(value);
3568 ia64_reloc_gprel22(P, addr);
3570 case R_IA64_PCREL21B:
3571 ia64_reloc_pcrel21(P, S, oc);
3574 /* This goes with R_IA64_LTOFF22X and points to the load to
3575 * convert into a move. We don't implement relaxation. */
3577 # elif defined(powerpc_HOST_ARCH)
3578 case R_PPC_ADDR16_LO:
3579 *(Elf32_Half*) P = value;
3582 case R_PPC_ADDR16_HI:
3583 *(Elf32_Half*) P = value >> 16;
3586 case R_PPC_ADDR16_HA:
3587 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3591 *(Elf32_Word *) P = value;
3595 *(Elf32_Word *) P = value - P;
3601 if( delta << 6 >> 6 != delta )
3603 value = (Elf_Addr) (&makeSymbolExtra( oc, ELF_R_SYM(info), value )
3607 if( value == 0 || delta << 6 >> 6 != delta )
3609 barf( "Unable to make SymbolExtra for #%d",
3615 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3616 | (delta & 0x3fffffc);
3620 #if x86_64_HOST_ARCH
3622 *(Elf64_Xword *)P = value;
3627 StgInt64 off = value - P;
3628 if (off >= 0x7fffffffL || off < -0x80000000L) {
3629 #if X86_64_ELF_NONPIC_HACK
3630 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3632 off = pltAddress + A - P;
3634 barf("R_X86_64_PC32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3635 symbol, off, oc->fileName );
3638 *(Elf64_Word *)P = (Elf64_Word)off;
3644 StgInt64 off = value - P;
3645 *(Elf64_Word *)P = (Elf64_Word)off;
3650 if (value >= 0x7fffffffL) {
3651 #if X86_64_ELF_NONPIC_HACK
3652 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3654 value = pltAddress + A;
3656 barf("R_X86_64_32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3657 symbol, value, oc->fileName );
3660 *(Elf64_Word *)P = (Elf64_Word)value;
3664 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3665 #if X86_64_ELF_NONPIC_HACK
3666 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3668 value = pltAddress + A;
3670 barf("R_X86_64_32S relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3671 symbol, value, oc->fileName );
3674 *(Elf64_Sword *)P = (Elf64_Sword)value;
3677 case R_X86_64_GOTPCREL:
3679 StgInt64 gotAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)->addr;
3680 StgInt64 off = gotAddress + A - P;
3681 *(Elf64_Word *)P = (Elf64_Word)off;
3685 case R_X86_64_PLT32:
3687 StgInt64 off = value - P;
3688 if (off >= 0x7fffffffL || off < -0x80000000L) {
3689 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3691 off = pltAddress + A - P;
3693 *(Elf64_Word *)P = (Elf64_Word)off;
3699 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3700 oc->fileName, (lnat)ELF_R_TYPE(info));
3709 ocResolve_ELF ( ObjectCode* oc )
3713 Elf_Sym* stab = NULL;
3714 char* ehdrC = (char*)(oc->image);
3715 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3716 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3718 /* first find "the" symbol table */
3719 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3721 /* also go find the string table */
3722 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3724 if (stab == NULL || strtab == NULL) {
3725 errorBelch("%s: can't find string or symbol table", oc->fileName);
3729 /* Process the relocation sections. */
3730 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3731 if (shdr[shnum].sh_type == SHT_REL) {
3732 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3733 shnum, stab, strtab );
3737 if (shdr[shnum].sh_type == SHT_RELA) {
3738 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3739 shnum, stab, strtab );
3744 #if defined(powerpc_HOST_ARCH)
3745 ocFlushInstructionCache( oc );
3753 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3754 * at the front. The following utility functions pack and unpack instructions, and
3755 * take care of the most common relocations.
3758 #ifdef ia64_HOST_ARCH
3761 ia64_extract_instruction(Elf64_Xword *target)
3764 int slot = (Elf_Addr)target & 3;
3765 target = (Elf_Addr)target & ~3;
3773 return ((w1 >> 5) & 0x1ffffffffff);
3775 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3779 barf("ia64_extract_instruction: invalid slot %p", target);
3784 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3786 int slot = (Elf_Addr)target & 3;
3787 target = (Elf_Addr)target & ~3;
3792 *target |= value << 5;
3795 *target |= value << 46;
3796 *(target+1) |= value >> 18;
3799 *(target+1) |= value << 23;
3805 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3807 Elf64_Xword instruction;
3808 Elf64_Sxword rel_value;
3810 rel_value = value - gp_val;
3811 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3812 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3814 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3815 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3816 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3817 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3818 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3819 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3823 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3825 Elf64_Xword instruction;
3826 Elf64_Sxword rel_value;
3829 entry = allocatePLTEntry(value, oc);
3831 rel_value = (entry >> 4) - (target >> 4);
3832 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3833 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3835 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3836 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3837 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3838 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3844 * PowerPC & X86_64 ELF specifics
3847 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3849 static int ocAllocateSymbolExtras_ELF( ObjectCode *oc )
3855 ehdr = (Elf_Ehdr *) oc->image;
3856 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3858 for( i = 0; i < ehdr->e_shnum; i++ )
3859 if( shdr[i].sh_type == SHT_SYMTAB )
3862 if( i == ehdr->e_shnum )
3864 errorBelch( "This ELF file contains no symtab" );
3868 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3870 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3871 (int) shdr[i].sh_entsize, (int) sizeof( Elf_Sym ) );
3876 return ocAllocateSymbolExtras( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3879 #endif /* powerpc */
3883 /* --------------------------------------------------------------------------
3885 * ------------------------------------------------------------------------*/
3887 #if defined(OBJFORMAT_MACHO)
3890 Support for MachO linking on Darwin/MacOS X
3891 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3893 I hereby formally apologize for the hackish nature of this code.
3894 Things that need to be done:
3895 *) implement ocVerifyImage_MachO
3896 *) add still more sanity checks.
3899 #if x86_64_HOST_ARCH || powerpc64_HOST_ARCH
3900 #define mach_header mach_header_64
3901 #define segment_command segment_command_64
3902 #define section section_64
3903 #define nlist nlist_64
3906 #ifdef powerpc_HOST_ARCH
3907 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3909 struct mach_header *header = (struct mach_header *) oc->image;
3910 struct load_command *lc = (struct load_command *) (header + 1);
3913 for( i = 0; i < header->ncmds; i++ )
3915 if( lc->cmd == LC_SYMTAB )
3917 // Find out the first and last undefined external
3918 // symbol, so we don't have to allocate too many
3920 struct symtab_command *symLC = (struct symtab_command *) lc;
3921 unsigned min = symLC->nsyms, max = 0;
3922 struct nlist *nlist =
3923 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3925 for(i=0;i<symLC->nsyms;i++)
3927 if(nlist[i].n_type & N_STAB)
3929 else if(nlist[i].n_type & N_EXT)
3931 if((nlist[i].n_type & N_TYPE) == N_UNDF
3932 && (nlist[i].n_value == 0))
3942 return ocAllocateSymbolExtras(oc, max - min + 1, min);
3947 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3949 return ocAllocateSymbolExtras(oc,0,0);
3952 #ifdef x86_64_HOST_ARCH
3953 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3955 struct mach_header *header = (struct mach_header *) oc->image;
3956 struct load_command *lc = (struct load_command *) (header + 1);
3959 for( i = 0; i < header->ncmds; i++ )
3961 if( lc->cmd == LC_SYMTAB )
3963 // Just allocate one entry for every symbol
3964 struct symtab_command *symLC = (struct symtab_command *) lc;
3966 return ocAllocateSymbolExtras(oc, symLC->nsyms, 0);
3969 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3971 return ocAllocateSymbolExtras(oc,0,0);
3975 static int ocVerifyImage_MachO(ObjectCode* oc)
3977 char *image = (char*) oc->image;
3978 struct mach_header *header = (struct mach_header*) image;
3980 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
3981 if(header->magic != MH_MAGIC_64)
3984 if(header->magic != MH_MAGIC)
3987 // FIXME: do some more verifying here
3991 static int resolveImports(
3994 struct symtab_command *symLC,
3995 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3996 unsigned long *indirectSyms,
3997 struct nlist *nlist)
4000 size_t itemSize = 4;
4003 int isJumpTable = 0;
4004 if(!strcmp(sect->sectname,"__jump_table"))
4008 ASSERT(sect->reserved2 == itemSize);
4012 for(i=0; i*itemSize < sect->size;i++)
4014 // according to otool, reserved1 contains the first index into the indirect symbol table
4015 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
4016 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4019 if((symbol->n_type & N_TYPE) == N_UNDF
4020 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
4021 addr = (void*) (symbol->n_value);
4023 addr = lookupSymbol(nm);
4026 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
4034 checkProddableBlock(oc,image + sect->offset + i*itemSize);
4035 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
4036 *(unsigned*)(image + sect->offset + i*itemSize + 1)
4037 = (char*)addr - (image + sect->offset + i*itemSize + 5);
4042 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
4043 ((void**)(image + sect->offset))[i] = addr;
4050 static unsigned long relocateAddress(
4053 struct section* sections,
4054 unsigned long address)
4057 for(i = 0; i < nSections; i++)
4059 if(sections[i].addr <= address
4060 && address < sections[i].addr + sections[i].size)
4062 return (unsigned long)oc->image
4063 + sections[i].offset + address - sections[i].addr;
4066 barf("Invalid Mach-O file:"
4067 "Address out of bounds while relocating object file");
4071 static int relocateSection(
4074 struct symtab_command *symLC, struct nlist *nlist,
4075 int nSections, struct section* sections, struct section *sect)
4077 struct relocation_info *relocs;
4080 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
4082 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
4084 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
4086 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
4090 relocs = (struct relocation_info*) (image + sect->reloff);
4094 #ifdef x86_64_HOST_ARCH
4095 struct relocation_info *reloc = &relocs[i];
4097 char *thingPtr = image + sect->offset + reloc->r_address;
4101 int type = reloc->r_type;
4103 checkProddableBlock(oc,thingPtr);
4104 switch(reloc->r_length)
4107 thing = *(uint8_t*)thingPtr;
4108 baseValue = (uint64_t)thingPtr + 1;
4111 thing = *(uint16_t*)thingPtr;
4112 baseValue = (uint64_t)thingPtr + 2;
4115 thing = *(uint32_t*)thingPtr;
4116 baseValue = (uint64_t)thingPtr + 4;
4119 thing = *(uint64_t*)thingPtr;
4120 baseValue = (uint64_t)thingPtr + 8;
4123 barf("Unknown size.");
4126 if(type == X86_64_RELOC_GOT
4127 || type == X86_64_RELOC_GOT_LOAD)
4129 ASSERT(reloc->r_extern);
4130 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)->addr;
4132 type = X86_64_RELOC_SIGNED;
4134 else if(reloc->r_extern)
4136 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4137 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4138 if(symbol->n_value == 0)
4139 value = (uint64_t) lookupSymbol(nm);
4141 value = relocateAddress(oc, nSections, sections,
4146 value = sections[reloc->r_symbolnum-1].offset
4147 - sections[reloc->r_symbolnum-1].addr
4151 if(type == X86_64_RELOC_BRANCH)
4153 if((int32_t)(value - baseValue) != (int64_t)(value - baseValue))
4155 ASSERT(reloc->r_extern);
4156 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)
4159 ASSERT((int32_t)(value - baseValue) == (int64_t)(value - baseValue));
4160 type = X86_64_RELOC_SIGNED;
4165 case X86_64_RELOC_UNSIGNED:
4166 ASSERT(!reloc->r_pcrel);
4169 case X86_64_RELOC_SIGNED:
4170 ASSERT(reloc->r_pcrel);
4171 thing += value - baseValue;
4173 case X86_64_RELOC_SUBTRACTOR:
4174 ASSERT(!reloc->r_pcrel);
4178 barf("unkown relocation");
4181 switch(reloc->r_length)
4184 *(uint8_t*)thingPtr = thing;
4187 *(uint16_t*)thingPtr = thing;
4190 *(uint32_t*)thingPtr = thing;
4193 *(uint64_t*)thingPtr = thing;
4197 if(relocs[i].r_address & R_SCATTERED)
4199 struct scattered_relocation_info *scat =
4200 (struct scattered_relocation_info*) &relocs[i];
4204 if(scat->r_length == 2)
4206 unsigned long word = 0;
4207 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
4208 checkProddableBlock(oc,wordPtr);
4210 // Note on relocation types:
4211 // i386 uses the GENERIC_RELOC_* types,
4212 // while ppc uses special PPC_RELOC_* types.
4213 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
4214 // in both cases, all others are different.
4215 // Therefore, we use GENERIC_RELOC_VANILLA
4216 // and GENERIC_RELOC_PAIR instead of the PPC variants,
4217 // and use #ifdefs for the other types.
4219 // Step 1: Figure out what the relocated value should be
4220 if(scat->r_type == GENERIC_RELOC_VANILLA)
4222 word = *wordPtr + (unsigned long) relocateAddress(
4229 #ifdef powerpc_HOST_ARCH
4230 else if(scat->r_type == PPC_RELOC_SECTDIFF
4231 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
4232 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
4233 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
4235 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
4238 struct scattered_relocation_info *pair =
4239 (struct scattered_relocation_info*) &relocs[i+1];
4241 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
4242 barf("Invalid Mach-O file: "
4243 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
4245 word = (unsigned long)
4246 (relocateAddress(oc, nSections, sections, scat->r_value)
4247 - relocateAddress(oc, nSections, sections, pair->r_value));
4250 #ifdef powerpc_HOST_ARCH
4251 else if(scat->r_type == PPC_RELOC_HI16
4252 || scat->r_type == PPC_RELOC_LO16
4253 || scat->r_type == PPC_RELOC_HA16
4254 || scat->r_type == PPC_RELOC_LO14)
4255 { // these are generated by label+offset things
4256 struct relocation_info *pair = &relocs[i+1];
4257 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
4258 barf("Invalid Mach-O file: "
4259 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
4261 if(scat->r_type == PPC_RELOC_LO16)
4263 word = ((unsigned short*) wordPtr)[1];
4264 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4266 else if(scat->r_type == PPC_RELOC_LO14)
4268 barf("Unsupported Relocation: PPC_RELOC_LO14");
4269 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
4270 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4272 else if(scat->r_type == PPC_RELOC_HI16)
4274 word = ((unsigned short*) wordPtr)[1] << 16;
4275 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4277 else if(scat->r_type == PPC_RELOC_HA16)
4279 word = ((unsigned short*) wordPtr)[1] << 16;
4280 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4284 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4291 continue; // ignore the others
4293 #ifdef powerpc_HOST_ARCH
4294 if(scat->r_type == GENERIC_RELOC_VANILLA
4295 || scat->r_type == PPC_RELOC_SECTDIFF)
4297 if(scat->r_type == GENERIC_RELOC_VANILLA
4298 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4303 #ifdef powerpc_HOST_ARCH
4304 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4306 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4308 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4310 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4312 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4314 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4315 + ((word & (1<<15)) ? 1 : 0);
4321 continue; // FIXME: I hope it's OK to ignore all the others.
4325 struct relocation_info *reloc = &relocs[i];
4326 if(reloc->r_pcrel && !reloc->r_extern)
4329 if(reloc->r_length == 2)
4331 unsigned long word = 0;
4332 #ifdef powerpc_HOST_ARCH
4333 unsigned long jumpIsland = 0;
4334 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4335 // to avoid warning and to catch
4339 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4340 checkProddableBlock(oc,wordPtr);
4342 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4346 #ifdef powerpc_HOST_ARCH
4347 else if(reloc->r_type == PPC_RELOC_LO16)
4349 word = ((unsigned short*) wordPtr)[1];
4350 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4352 else if(reloc->r_type == PPC_RELOC_HI16)
4354 word = ((unsigned short*) wordPtr)[1] << 16;
4355 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4357 else if(reloc->r_type == PPC_RELOC_HA16)
4359 word = ((unsigned short*) wordPtr)[1] << 16;
4360 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4362 else if(reloc->r_type == PPC_RELOC_BR24)
4365 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4369 if(!reloc->r_extern)
4372 sections[reloc->r_symbolnum-1].offset
4373 - sections[reloc->r_symbolnum-1].addr
4380 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4381 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4382 void *symbolAddress = lookupSymbol(nm);
4385 errorBelch("\nunknown symbol `%s'", nm);
4391 #ifdef powerpc_HOST_ARCH
4392 // In the .o file, this should be a relative jump to NULL
4393 // and we'll change it to a relative jump to the symbol
4394 ASSERT(word + reloc->r_address == 0);
4395 jumpIsland = (unsigned long)
4396 &makeSymbolExtra(oc,
4398 (unsigned long) symbolAddress)
4402 offsetToJumpIsland = word + jumpIsland
4403 - (((long)image) + sect->offset - sect->addr);
4406 word += (unsigned long) symbolAddress
4407 - (((long)image) + sect->offset - sect->addr);
4411 word += (unsigned long) symbolAddress;
4415 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4420 #ifdef powerpc_HOST_ARCH
4421 else if(reloc->r_type == PPC_RELOC_LO16)
4423 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4426 else if(reloc->r_type == PPC_RELOC_HI16)
4428 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4431 else if(reloc->r_type == PPC_RELOC_HA16)
4433 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4434 + ((word & (1<<15)) ? 1 : 0);
4437 else if(reloc->r_type == PPC_RELOC_BR24)
4439 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4441 // The branch offset is too large.
4442 // Therefore, we try to use a jump island.
4445 barf("unconditional relative branch out of range: "
4446 "no jump island available");
4449 word = offsetToJumpIsland;
4450 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4451 barf("unconditional relative branch out of range: "
4452 "jump island out of range");
4454 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4459 barf("\nunknown relocation %d",reloc->r_type);
4467 static int ocGetNames_MachO(ObjectCode* oc)
4469 char *image = (char*) oc->image;
4470 struct mach_header *header = (struct mach_header*) image;
4471 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4472 unsigned i,curSymbol = 0;
4473 struct segment_command *segLC = NULL;
4474 struct section *sections;
4475 struct symtab_command *symLC = NULL;
4476 struct nlist *nlist;
4477 unsigned long commonSize = 0;
4478 char *commonStorage = NULL;
4479 unsigned long commonCounter;
4481 for(i=0;i<header->ncmds;i++)
4483 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4484 segLC = (struct segment_command*) lc;
4485 else if(lc->cmd == LC_SYMTAB)
4486 symLC = (struct symtab_command*) lc;
4487 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4490 sections = (struct section*) (segLC+1);
4491 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4495 barf("ocGetNames_MachO: no segment load command");
4497 for(i=0;i<segLC->nsects;i++)
4499 if(sections[i].size == 0)
4502 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4504 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4505 "ocGetNames_MachO(common symbols)");
4506 sections[i].offset = zeroFillArea - image;
4509 if(!strcmp(sections[i].sectname,"__text"))
4510 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4511 (void*) (image + sections[i].offset),
4512 (void*) (image + sections[i].offset + sections[i].size));
4513 else if(!strcmp(sections[i].sectname,"__const"))
4514 addSection(oc, SECTIONKIND_RWDATA,
4515 (void*) (image + sections[i].offset),
4516 (void*) (image + sections[i].offset + sections[i].size));
4517 else if(!strcmp(sections[i].sectname,"__data"))
4518 addSection(oc, SECTIONKIND_RWDATA,
4519 (void*) (image + sections[i].offset),
4520 (void*) (image + sections[i].offset + sections[i].size));
4521 else if(!strcmp(sections[i].sectname,"__bss")
4522 || !strcmp(sections[i].sectname,"__common"))
4523 addSection(oc, SECTIONKIND_RWDATA,
4524 (void*) (image + sections[i].offset),
4525 (void*) (image + sections[i].offset + sections[i].size));
4527 addProddableBlock(oc, (void*) (image + sections[i].offset),
4531 // count external symbols defined here
4535 for(i=0;i<symLC->nsyms;i++)
4537 if(nlist[i].n_type & N_STAB)
4539 else if(nlist[i].n_type & N_EXT)
4541 if((nlist[i].n_type & N_TYPE) == N_UNDF
4542 && (nlist[i].n_value != 0))
4544 commonSize += nlist[i].n_value;
4547 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4552 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4553 "ocGetNames_MachO(oc->symbols)");
4557 for(i=0;i<symLC->nsyms;i++)
4559 if(nlist[i].n_type & N_STAB)
4561 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4563 if(nlist[i].n_type & N_EXT)
4565 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4566 if((nlist[i].n_desc & N_WEAK_DEF) && lookupSymbol(nm))
4567 ; // weak definition, and we already have a definition
4570 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4572 + sections[nlist[i].n_sect-1].offset
4573 - sections[nlist[i].n_sect-1].addr
4574 + nlist[i].n_value);
4575 oc->symbols[curSymbol++] = nm;
4582 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4583 commonCounter = (unsigned long)commonStorage;
4586 for(i=0;i<symLC->nsyms;i++)
4588 if((nlist[i].n_type & N_TYPE) == N_UNDF
4589 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4591 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4592 unsigned long sz = nlist[i].n_value;
4594 nlist[i].n_value = commonCounter;
4596 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4597 (void*)commonCounter);
4598 oc->symbols[curSymbol++] = nm;
4600 commonCounter += sz;
4607 static int ocResolve_MachO(ObjectCode* oc)
4609 char *image = (char*) oc->image;
4610 struct mach_header *header = (struct mach_header*) image;
4611 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4613 struct segment_command *segLC = NULL;
4614 struct section *sections;
4615 struct symtab_command *symLC = NULL;
4616 struct dysymtab_command *dsymLC = NULL;
4617 struct nlist *nlist;
4619 for(i=0;i<header->ncmds;i++)
4621 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4622 segLC = (struct segment_command*) lc;
4623 else if(lc->cmd == LC_SYMTAB)
4624 symLC = (struct symtab_command*) lc;
4625 else if(lc->cmd == LC_DYSYMTAB)
4626 dsymLC = (struct dysymtab_command*) lc;
4627 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4630 sections = (struct section*) (segLC+1);
4631 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4636 unsigned long *indirectSyms
4637 = (unsigned long*) (image + dsymLC->indirectsymoff);
4639 for(i=0;i<segLC->nsects;i++)
4641 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4642 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4643 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4645 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4648 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4649 || !strcmp(sections[i].sectname,"__pointers"))
4651 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4654 else if(!strcmp(sections[i].sectname,"__jump_table"))
4656 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4662 for(i=0;i<segLC->nsects;i++)
4664 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4668 #if defined (powerpc_HOST_ARCH)
4669 ocFlushInstructionCache( oc );
4675 #ifdef powerpc_HOST_ARCH
4677 * The Mach-O object format uses leading underscores. But not everywhere.
4678 * There is a small number of runtime support functions defined in
4679 * libcc_dynamic.a whose name does not have a leading underscore.
4680 * As a consequence, we can't get their address from C code.
4681 * We have to use inline assembler just to take the address of a function.
4685 static void machoInitSymbolsWithoutUnderscore()
4687 extern void* symbolsWithoutUnderscore[];
4688 void **p = symbolsWithoutUnderscore;
4689 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4691 #undef SymI_NeedsProto
4692 #define SymI_NeedsProto(x) \
4693 __asm__ volatile(".long " # x);
4695 RTS_MACHO_NOUNDERLINE_SYMBOLS
4697 __asm__ volatile(".text");
4699 #undef SymI_NeedsProto
4700 #define SymI_NeedsProto(x) \
4701 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4703 RTS_MACHO_NOUNDERLINE_SYMBOLS
4705 #undef SymI_NeedsProto
4710 * Figure out by how much to shift the entire Mach-O file in memory
4711 * when loading so that its single segment ends up 16-byte-aligned
4713 static int machoGetMisalignment( FILE * f )
4715 struct mach_header header;
4718 fread(&header, sizeof(header), 1, f);
4721 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
4722 if(header.magic != MH_MAGIC_64)
4725 if(header.magic != MH_MAGIC)
4729 misalignment = (header.sizeofcmds + sizeof(header))
4732 return misalignment ? (16 - misalignment) : 0;