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(hs_hpc_module) \
659 SymI_HasProto(initLinker) \
660 SymI_HasProto(unpackClosurezh_fast) \
661 SymI_HasProto(getApStackValzh_fast) \
662 SymI_HasProto(getSparkzh_fast) \
663 SymI_HasProto(int2Integerzh_fast) \
664 SymI_HasProto(integer2Intzh_fast) \
665 SymI_HasProto(integer2Wordzh_fast) \
666 SymI_HasProto(isCurrentThreadBoundzh_fast) \
667 SymI_HasProto(isDoubleDenormalized) \
668 SymI_HasProto(isDoubleInfinite) \
669 SymI_HasProto(isDoubleNaN) \
670 SymI_HasProto(isDoubleNegativeZero) \
671 SymI_HasProto(isEmptyMVarzh_fast) \
672 SymI_HasProto(isFloatDenormalized) \
673 SymI_HasProto(isFloatInfinite) \
674 SymI_HasProto(isFloatNaN) \
675 SymI_HasProto(isFloatNegativeZero) \
676 SymI_HasProto(killThreadzh_fast) \
677 SymI_HasProto(loadObj) \
678 SymI_HasProto(insertStableSymbol) \
679 SymI_HasProto(insertSymbol) \
680 SymI_HasProto(lookupSymbol) \
681 SymI_HasProto(makeStablePtrzh_fast) \
682 SymI_HasProto(minusIntegerzh_fast) \
683 SymI_HasProto(mkApUpd0zh_fast) \
684 SymI_HasProto(myThreadIdzh_fast) \
685 SymI_HasProto(labelThreadzh_fast) \
686 SymI_HasProto(newArrayzh_fast) \
687 SymI_HasProto(newBCOzh_fast) \
688 SymI_HasProto(newByteArrayzh_fast) \
689 SymI_HasProto_redirect(newCAF, newDynCAF) \
690 SymI_HasProto(newMVarzh_fast) \
691 SymI_HasProto(newMutVarzh_fast) \
692 SymI_HasProto(newTVarzh_fast) \
693 SymI_HasProto(noDuplicatezh_fast) \
694 SymI_HasProto(atomicModifyMutVarzh_fast) \
695 SymI_HasProto(newPinnedByteArrayzh_fast) \
696 SymI_HasProto(newAlignedPinnedByteArrayzh_fast) \
697 SymI_HasProto(newSpark) \
698 SymI_HasProto(orIntegerzh_fast) \
699 SymI_HasProto(performGC) \
700 SymI_HasProto(performMajorGC) \
701 SymI_HasProto(plusIntegerzh_fast) \
702 SymI_HasProto(prog_argc) \
703 SymI_HasProto(prog_argv) \
704 SymI_HasProto(putMVarzh_fast) \
705 SymI_HasProto(quotIntegerzh_fast) \
706 SymI_HasProto(quotRemIntegerzh_fast) \
707 SymI_HasProto(raisezh_fast) \
708 SymI_HasProto(raiseIOzh_fast) \
709 SymI_HasProto(readTVarzh_fast) \
710 SymI_HasProto(readTVarIOzh_fast) \
711 SymI_HasProto(remIntegerzh_fast) \
712 SymI_HasProto(resetNonBlockingFd) \
713 SymI_HasProto(resumeThread) \
714 SymI_HasProto(resolveObjs) \
715 SymI_HasProto(retryzh_fast) \
716 SymI_HasProto(rts_apply) \
717 SymI_HasProto(rts_checkSchedStatus) \
718 SymI_HasProto(rts_eval) \
719 SymI_HasProto(rts_evalIO) \
720 SymI_HasProto(rts_evalLazyIO) \
721 SymI_HasProto(rts_evalStableIO) \
722 SymI_HasProto(rts_eval_) \
723 SymI_HasProto(rts_getBool) \
724 SymI_HasProto(rts_getChar) \
725 SymI_HasProto(rts_getDouble) \
726 SymI_HasProto(rts_getFloat) \
727 SymI_HasProto(rts_getInt) \
728 SymI_HasProto(rts_getInt8) \
729 SymI_HasProto(rts_getInt16) \
730 SymI_HasProto(rts_getInt32) \
731 SymI_HasProto(rts_getInt64) \
732 SymI_HasProto(rts_getPtr) \
733 SymI_HasProto(rts_getFunPtr) \
734 SymI_HasProto(rts_getStablePtr) \
735 SymI_HasProto(rts_getThreadId) \
736 SymI_HasProto(rts_getWord) \
737 SymI_HasProto(rts_getWord8) \
738 SymI_HasProto(rts_getWord16) \
739 SymI_HasProto(rts_getWord32) \
740 SymI_HasProto(rts_getWord64) \
741 SymI_HasProto(rts_lock) \
742 SymI_HasProto(rts_mkBool) \
743 SymI_HasProto(rts_mkChar) \
744 SymI_HasProto(rts_mkDouble) \
745 SymI_HasProto(rts_mkFloat) \
746 SymI_HasProto(rts_mkInt) \
747 SymI_HasProto(rts_mkInt8) \
748 SymI_HasProto(rts_mkInt16) \
749 SymI_HasProto(rts_mkInt32) \
750 SymI_HasProto(rts_mkInt64) \
751 SymI_HasProto(rts_mkPtr) \
752 SymI_HasProto(rts_mkFunPtr) \
753 SymI_HasProto(rts_mkStablePtr) \
754 SymI_HasProto(rts_mkString) \
755 SymI_HasProto(rts_mkWord) \
756 SymI_HasProto(rts_mkWord8) \
757 SymI_HasProto(rts_mkWord16) \
758 SymI_HasProto(rts_mkWord32) \
759 SymI_HasProto(rts_mkWord64) \
760 SymI_HasProto(rts_unlock) \
761 SymI_HasProto(rtsSupportsBoundThreads) \
762 SymI_HasProto(__hscore_get_saved_termios) \
763 SymI_HasProto(__hscore_set_saved_termios) \
764 SymI_HasProto(setProgArgv) \
765 SymI_HasProto(startupHaskell) \
766 SymI_HasProto(shutdownHaskell) \
767 SymI_HasProto(shutdownHaskellAndExit) \
768 SymI_HasProto(stable_ptr_table) \
769 SymI_HasProto(stackOverflow) \
770 SymI_HasProto(stg_CAF_BLACKHOLE_info) \
771 SymI_HasProto(__stg_EAGER_BLACKHOLE_info) \
772 SymI_HasProto(awakenBlockedQueue) \
773 SymI_HasProto(startTimer) \
774 SymI_HasProto(stg_CHARLIKE_closure) \
775 SymI_HasProto(stg_MVAR_CLEAN_info) \
776 SymI_HasProto(stg_MVAR_DIRTY_info) \
777 SymI_HasProto(stg_IND_STATIC_info) \
778 SymI_HasProto(stg_INTLIKE_closure) \
779 SymI_HasProto(stg_MUT_ARR_PTRS_DIRTY_info) \
780 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN_info) \
781 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN0_info) \
782 SymI_HasProto(stg_WEAK_info) \
783 SymI_HasProto(stg_ap_v_info) \
784 SymI_HasProto(stg_ap_f_info) \
785 SymI_HasProto(stg_ap_d_info) \
786 SymI_HasProto(stg_ap_l_info) \
787 SymI_HasProto(stg_ap_n_info) \
788 SymI_HasProto(stg_ap_p_info) \
789 SymI_HasProto(stg_ap_pv_info) \
790 SymI_HasProto(stg_ap_pp_info) \
791 SymI_HasProto(stg_ap_ppv_info) \
792 SymI_HasProto(stg_ap_ppp_info) \
793 SymI_HasProto(stg_ap_pppv_info) \
794 SymI_HasProto(stg_ap_pppp_info) \
795 SymI_HasProto(stg_ap_ppppp_info) \
796 SymI_HasProto(stg_ap_pppppp_info) \
797 SymI_HasProto(stg_ap_0_fast) \
798 SymI_HasProto(stg_ap_v_fast) \
799 SymI_HasProto(stg_ap_f_fast) \
800 SymI_HasProto(stg_ap_d_fast) \
801 SymI_HasProto(stg_ap_l_fast) \
802 SymI_HasProto(stg_ap_n_fast) \
803 SymI_HasProto(stg_ap_p_fast) \
804 SymI_HasProto(stg_ap_pv_fast) \
805 SymI_HasProto(stg_ap_pp_fast) \
806 SymI_HasProto(stg_ap_ppv_fast) \
807 SymI_HasProto(stg_ap_ppp_fast) \
808 SymI_HasProto(stg_ap_pppv_fast) \
809 SymI_HasProto(stg_ap_pppp_fast) \
810 SymI_HasProto(stg_ap_ppppp_fast) \
811 SymI_HasProto(stg_ap_pppppp_fast) \
812 SymI_HasProto(stg_ap_1_upd_info) \
813 SymI_HasProto(stg_ap_2_upd_info) \
814 SymI_HasProto(stg_ap_3_upd_info) \
815 SymI_HasProto(stg_ap_4_upd_info) \
816 SymI_HasProto(stg_ap_5_upd_info) \
817 SymI_HasProto(stg_ap_6_upd_info) \
818 SymI_HasProto(stg_ap_7_upd_info) \
819 SymI_HasProto(stg_exit) \
820 SymI_HasProto(stg_sel_0_upd_info) \
821 SymI_HasProto(stg_sel_10_upd_info) \
822 SymI_HasProto(stg_sel_11_upd_info) \
823 SymI_HasProto(stg_sel_12_upd_info) \
824 SymI_HasProto(stg_sel_13_upd_info) \
825 SymI_HasProto(stg_sel_14_upd_info) \
826 SymI_HasProto(stg_sel_15_upd_info) \
827 SymI_HasProto(stg_sel_1_upd_info) \
828 SymI_HasProto(stg_sel_2_upd_info) \
829 SymI_HasProto(stg_sel_3_upd_info) \
830 SymI_HasProto(stg_sel_4_upd_info) \
831 SymI_HasProto(stg_sel_5_upd_info) \
832 SymI_HasProto(stg_sel_6_upd_info) \
833 SymI_HasProto(stg_sel_7_upd_info) \
834 SymI_HasProto(stg_sel_8_upd_info) \
835 SymI_HasProto(stg_sel_9_upd_info) \
836 SymI_HasProto(stg_upd_frame_info) \
837 SymI_HasProto(suspendThread) \
838 SymI_HasProto(takeMVarzh_fast) \
839 SymI_HasProto(threadStatuszh_fast) \
840 SymI_HasProto(timesIntegerzh_fast) \
841 SymI_HasProto(tryPutMVarzh_fast) \
842 SymI_HasProto(tryTakeMVarzh_fast) \
843 SymI_HasProto(unblockAsyncExceptionszh_fast) \
844 SymI_HasProto(unloadObj) \
845 SymI_HasProto(unsafeThawArrayzh_fast) \
846 SymI_HasProto(waitReadzh_fast) \
847 SymI_HasProto(waitWritezh_fast) \
848 SymI_HasProto(word2Integerzh_fast) \
849 SymI_HasProto(writeTVarzh_fast) \
850 SymI_HasProto(xorIntegerzh_fast) \
851 SymI_HasProto(yieldzh_fast) \
852 SymI_NeedsProto(stg_interp_constr_entry) \
853 SymI_HasProto(allocateExec) \
854 SymI_HasProto(freeExec) \
855 SymI_HasProto(getAllocations) \
856 SymI_HasProto(revertCAFs) \
857 SymI_HasProto(RtsFlags) \
858 SymI_NeedsProto(rts_breakpoint_io_action) \
859 SymI_NeedsProto(rts_stop_next_breakpoint) \
860 SymI_NeedsProto(rts_stop_on_exception) \
861 SymI_HasProto(stopTimer) \
862 SymI_HasProto(n_capabilities) \
863 SymI_HasProto(traceCcszh_fast) \
864 RTS_USER_SIGNALS_SYMBOLS
866 #ifdef SUPPORT_LONG_LONGS
867 #define RTS_LONG_LONG_SYMS \
868 SymI_HasProto(int64ToIntegerzh_fast) \
869 SymI_HasProto(word64ToIntegerzh_fast)
871 #define RTS_LONG_LONG_SYMS /* nothing */
874 // 64-bit support functions in libgcc.a
875 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
876 #define RTS_LIBGCC_SYMBOLS \
877 SymI_NeedsProto(__divdi3) \
878 SymI_NeedsProto(__udivdi3) \
879 SymI_NeedsProto(__moddi3) \
880 SymI_NeedsProto(__umoddi3) \
881 SymI_NeedsProto(__muldi3) \
882 SymI_NeedsProto(__ashldi3) \
883 SymI_NeedsProto(__ashrdi3) \
884 SymI_NeedsProto(__lshrdi3) \
885 SymI_NeedsProto(__eprintf)
886 #elif defined(ia64_HOST_ARCH)
887 #define RTS_LIBGCC_SYMBOLS \
888 SymI_NeedsProto(__divdi3) \
889 SymI_NeedsProto(__udivdi3) \
890 SymI_NeedsProto(__moddi3) \
891 SymI_NeedsProto(__umoddi3) \
892 SymI_NeedsProto(__divsf3) \
893 SymI_NeedsProto(__divdf3)
895 #define RTS_LIBGCC_SYMBOLS
898 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
899 // Symbols that don't have a leading underscore
900 // on Mac OS X. They have to receive special treatment,
901 // see machoInitSymbolsWithoutUnderscore()
902 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
903 SymI_NeedsProto(saveFP) \
904 SymI_NeedsProto(restFP)
907 /* entirely bogus claims about types of these symbols */
908 #define SymI_NeedsProto(vvv) extern void vvv(void);
909 #if defined(__PIC__) && defined(mingw32_TARGET_OS)
910 #define SymE_HasProto(vvv) SymE_HasProto(vvv);
911 #define SymE_NeedsProto(vvv) extern void _imp__ ## vvv (void);
913 #define SymE_NeedsProto(vvv) SymI_NeedsProto(vvv);
914 #define SymE_HasProto(vvv) SymI_HasProto(vvv)
916 #define SymI_HasProto(vvv) /**/
917 #define SymI_HasProto_redirect(vvv,xxx) /**/
921 RTS_POSIX_ONLY_SYMBOLS
922 RTS_MINGW_ONLY_SYMBOLS
923 RTS_CYGWIN_ONLY_SYMBOLS
924 RTS_DARWIN_ONLY_SYMBOLS
927 #undef SymI_NeedsProto
929 #undef SymI_HasProto_redirect
931 #undef SymE_NeedsProto
933 #ifdef LEADING_UNDERSCORE
934 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
936 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
939 #define SymI_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
941 #define SymE_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
942 (void*)DLL_IMPORT_DATA_REF(vvv) },
944 #define SymI_NeedsProto(vvv) SymI_HasProto(vvv)
945 #define SymE_NeedsProto(vvv) SymE_HasProto(vvv)
947 // SymI_HasProto_redirect allows us to redirect references to one symbol to
948 // another symbol. See newCAF/newDynCAF for an example.
949 #define SymI_HasProto_redirect(vvv,xxx) \
950 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
953 static RtsSymbolVal rtsSyms[] = {
957 RTS_POSIX_ONLY_SYMBOLS
958 RTS_MINGW_ONLY_SYMBOLS
959 RTS_CYGWIN_ONLY_SYMBOLS
960 RTS_DARWIN_ONLY_SYMBOLS
963 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
964 // dyld stub code contains references to this,
965 // but it should never be called because we treat
966 // lazy pointers as nonlazy.
967 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
969 { 0, 0 } /* sentinel */
974 /* -----------------------------------------------------------------------------
975 * Insert symbols into hash tables, checking for duplicates.
978 static void ghciInsertStrHashTable ( char* obj_name,
984 if (lookupHashTable(table, (StgWord)key) == NULL)
986 insertStrHashTable(table, (StgWord)key, data);
991 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
993 "whilst processing object file\n"
995 "This could be caused by:\n"
996 " * Loading two different object files which export the same symbol\n"
997 " * Specifying the same object file twice on the GHCi command line\n"
998 " * An incorrect `package.conf' entry, causing some object to be\n"
1000 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
1007 /* -----------------------------------------------------------------------------
1008 * initialize the object linker
1012 static int linker_init_done = 0 ;
1014 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1015 static void *dl_prog_handle;
1023 /* Make initLinker idempotent, so we can call it
1024 before evey relevant operation; that means we
1025 don't need to initialise the linker separately */
1026 if (linker_init_done == 1) { return; } else {
1027 linker_init_done = 1;
1030 stablehash = allocStrHashTable();
1031 symhash = allocStrHashTable();
1033 /* populate the symbol table with stuff from the RTS */
1034 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
1035 ghciInsertStrHashTable("(GHCi built-in symbols)",
1036 symhash, sym->lbl, sym->addr);
1038 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1039 machoInitSymbolsWithoutUnderscore();
1042 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1043 # if defined(RTLD_DEFAULT)
1044 dl_prog_handle = RTLD_DEFAULT;
1046 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
1047 # endif /* RTLD_DEFAULT */
1050 #if defined(x86_64_HOST_ARCH)
1051 if (RtsFlags.MiscFlags.linkerMemBase != 0) {
1052 // User-override for mmap_32bit_base
1053 mmap_32bit_base = (void*)RtsFlags.MiscFlags.linkerMemBase;
1058 /* -----------------------------------------------------------------------------
1059 * Loading DLL or .so dynamic libraries
1060 * -----------------------------------------------------------------------------
1062 * Add a DLL from which symbols may be found. In the ELF case, just
1063 * do RTLD_GLOBAL-style add, so no further messing around needs to
1064 * happen in order that symbols in the loaded .so are findable --
1065 * lookupSymbol() will subsequently see them by dlsym on the program's
1066 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
1068 * In the PEi386 case, open the DLLs and put handles to them in a
1069 * linked list. When looking for a symbol, try all handles in the
1070 * list. This means that we need to load even DLLs that are guaranteed
1071 * to be in the ghc.exe image already, just so we can get a handle
1072 * to give to loadSymbol, so that we can find the symbols. For such
1073 * libraries, the LoadLibrary call should be a no-op except for returning
1078 #if defined(OBJFORMAT_PEi386)
1079 /* A record for storing handles into DLLs. */
1084 struct _OpenedDLL* next;
1089 /* A list thereof. */
1090 static OpenedDLL* opened_dlls = NULL;
1094 addDLL( char *dll_name )
1096 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1097 /* ------------------- ELF DLL loader ------------------- */
1103 // omitted: RTLD_NOW
1104 // see http://www.haskell.org/pipermail/cvs-ghc/2007-September/038570.html
1105 hdl= dlopen(dll_name, RTLD_LAZY | RTLD_GLOBAL);
1108 /* dlopen failed; return a ptr to the error msg. */
1110 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1117 # elif defined(OBJFORMAT_PEi386)
1118 /* ------------------- Win32 DLL loader ------------------- */
1126 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1128 /* See if we've already got it, and ignore if so. */
1129 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1130 if (0 == strcmp(o_dll->name, dll_name))
1134 /* The file name has no suffix (yet) so that we can try
1135 both foo.dll and foo.drv
1137 The documentation for LoadLibrary says:
1138 If no file name extension is specified in the lpFileName
1139 parameter, the default library extension .dll is
1140 appended. However, the file name string can include a trailing
1141 point character (.) to indicate that the module name has no
1144 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1145 sprintf(buf, "%s.DLL", dll_name);
1146 instance = LoadLibrary(buf);
1147 if (instance == NULL) {
1148 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1149 // KAA: allow loading of drivers (like winspool.drv)
1150 sprintf(buf, "%s.DRV", dll_name);
1151 instance = LoadLibrary(buf);
1152 if (instance == NULL) {
1153 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1154 // #1883: allow loading of unix-style libfoo.dll DLLs
1155 sprintf(buf, "lib%s.DLL", dll_name);
1156 instance = LoadLibrary(buf);
1157 if (instance == NULL) {
1164 /* Add this DLL to the list of DLLs in which to search for symbols. */
1165 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1166 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1167 strcpy(o_dll->name, dll_name);
1168 o_dll->instance = instance;
1169 o_dll->next = opened_dlls;
1170 opened_dlls = o_dll;
1176 sysErrorBelch(dll_name);
1178 /* LoadLibrary failed; return a ptr to the error msg. */
1179 return "addDLL: could not load DLL";
1182 barf("addDLL: not implemented on this platform");
1186 /* -----------------------------------------------------------------------------
1187 * insert a stable symbol in the hash table
1191 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1193 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1197 /* -----------------------------------------------------------------------------
1198 * insert a symbol in the hash table
1201 insertSymbol(char* obj_name, char* key, void* data)
1203 ghciInsertStrHashTable(obj_name, symhash, key, data);
1206 /* -----------------------------------------------------------------------------
1207 * lookup a symbol in the hash table
1210 lookupSymbol( char *lbl )
1214 ASSERT(symhash != NULL);
1215 val = lookupStrHashTable(symhash, lbl);
1218 # if defined(OBJFORMAT_ELF)
1219 return dlsym(dl_prog_handle, lbl);
1220 # elif defined(OBJFORMAT_MACHO)
1222 /* On OS X 10.3 and later, we use dlsym instead of the old legacy
1225 HACK: On OS X, global symbols are prefixed with an underscore.
1226 However, dlsym wants us to omit the leading underscore from the
1227 symbol name. For now, we simply strip it off here (and ONLY
1230 ASSERT(lbl[0] == '_');
1231 return dlsym(dl_prog_handle, lbl+1);
1233 if(NSIsSymbolNameDefined(lbl)) {
1234 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1235 return NSAddressOfSymbol(symbol);
1239 # endif /* HAVE_DLFCN_H */
1240 # elif defined(OBJFORMAT_PEi386)
1243 sym = lookupSymbolInDLLs(lbl);
1244 if (sym != NULL) { return sym; };
1246 // Also try looking up the symbol without the @N suffix. Some
1247 // DLLs have the suffixes on their symbols, some don't.
1248 zapTrailingAtSign ( lbl );
1249 sym = lookupSymbolInDLLs(lbl);
1250 if (sym != NULL) { return sym; };
1262 /* -----------------------------------------------------------------------------
1263 * Debugging aid: look in GHCi's object symbol tables for symbols
1264 * within DELTA bytes of the specified address, and show their names.
1267 void ghci_enquire ( char* addr );
1269 void ghci_enquire ( char* addr )
1274 const int DELTA = 64;
1279 for (oc = objects; oc; oc = oc->next) {
1280 for (i = 0; i < oc->n_symbols; i++) {
1281 sym = oc->symbols[i];
1282 if (sym == NULL) continue;
1285 a = lookupStrHashTable(symhash, sym);
1288 // debugBelch("ghci_enquire: can't find %s\n", sym);
1290 else if (addr-DELTA <= a && a <= addr+DELTA) {
1291 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1298 #ifdef ia64_HOST_ARCH
1299 static unsigned int PLTSize(void);
1303 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1306 mmapForLinker (size_t bytes, nat flags, int fd)
1308 void *map_addr = NULL;
1311 static nat fixed = 0;
1313 pagesize = getpagesize();
1314 size = ROUND_UP(bytes, pagesize);
1316 #if defined(x86_64_HOST_ARCH)
1319 if (mmap_32bit_base != 0) {
1320 map_addr = mmap_32bit_base;
1324 result = mmap(map_addr, size, PROT_EXEC|PROT_READ|PROT_WRITE,
1325 MAP_PRIVATE|TRY_MAP_32BIT|fixed|flags, fd, 0);
1327 if (result == MAP_FAILED) {
1328 sysErrorBelch("mmap %lu bytes at %p",(lnat)size,map_addr);
1329 errorBelch("Try specifying an address with +RTS -xm<addr> -RTS");
1330 stg_exit(EXIT_FAILURE);
1333 #if defined(x86_64_HOST_ARCH)
1334 if (mmap_32bit_base != 0) {
1335 if (result == map_addr) {
1336 mmap_32bit_base = map_addr + size;
1338 if ((W_)result > 0x80000000) {
1339 // oops, we were given memory over 2Gb
1340 #if defined(freebsd_HOST_OS)
1341 // Some platforms require MAP_FIXED. This is normally
1342 // a bad idea, because MAP_FIXED will overwrite
1343 // existing mappings.
1344 munmap(result,size);
1348 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);
1351 // hmm, we were given memory somewhere else, but it's
1352 // still under 2Gb so we can use it. Next time, ask
1353 // for memory right after the place we just got some
1354 mmap_32bit_base = (void*)result + size;
1358 if ((W_)result > 0x80000000) {
1359 // oops, we were given memory over 2Gb
1360 // ... try allocating memory somewhere else?;
1361 debugTrace(DEBUG_linker,"MAP_32BIT didn't work; gave us %lu bytes at 0x%p", bytes, result);
1362 munmap(result, size);
1364 // Set a base address and try again... (guess: 1Gb)
1365 mmap_32bit_base = (void*)0x40000000;
1375 /* -----------------------------------------------------------------------------
1376 * Load an obj (populate the global symbol table, but don't resolve yet)
1378 * Returns: 1 if ok, 0 on error.
1381 loadObj( char *path )
1393 /* debugBelch("loadObj %s\n", path ); */
1395 /* Check that we haven't already loaded this object.
1396 Ignore requests to load multiple times */
1400 for (o = objects; o; o = o->next) {
1401 if (0 == strcmp(o->fileName, path)) {
1403 break; /* don't need to search further */
1407 IF_DEBUG(linker, debugBelch(
1408 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1409 "same object file twice:\n"
1411 "GHCi will ignore this, but be warned.\n"
1413 return 1; /* success */
1417 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1419 # if defined(OBJFORMAT_ELF)
1420 oc->formatName = "ELF";
1421 # elif defined(OBJFORMAT_PEi386)
1422 oc->formatName = "PEi386";
1423 # elif defined(OBJFORMAT_MACHO)
1424 oc->formatName = "Mach-O";
1427 barf("loadObj: not implemented on this platform");
1430 r = stat(path, &st);
1431 if (r == -1) { return 0; }
1433 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1434 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1435 strcpy(oc->fileName, path);
1437 oc->fileSize = st.st_size;
1439 oc->sections = NULL;
1440 oc->proddables = NULL;
1442 /* chain it onto the list of objects */
1447 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1449 #if defined(openbsd_HOST_OS)
1450 fd = open(path, O_RDONLY, S_IRUSR);
1452 fd = open(path, O_RDONLY);
1455 barf("loadObj: can't open `%s'", path);
1457 #ifdef ia64_HOST_ARCH
1458 /* The PLT needs to be right before the object */
1461 pagesize = getpagesize();
1462 n = ROUND_UP(PLTSize(), pagesize);
1463 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1464 if (oc->plt == MAP_FAILED)
1465 barf("loadObj: can't allocate PLT");
1468 map_addr = oc->plt + n;
1470 n = ROUND_UP(oc->fileSize, pagesize);
1471 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1472 MAP_PRIVATE|TRY_MAP_32BIT, fd, 0);
1473 if (oc->image == MAP_FAILED)
1474 barf("loadObj: can't map `%s'", path);
1477 oc->image = mmapForLinker(oc->fileSize, 0, fd);
1482 #else /* !USE_MMAP */
1483 /* load the image into memory */
1484 f = fopen(path, "rb");
1486 barf("loadObj: can't read `%s'", path);
1488 # if defined(mingw32_HOST_OS)
1489 // TODO: We would like to use allocateExec here, but allocateExec
1490 // cannot currently allocate blocks large enough.
1491 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1492 PAGE_EXECUTE_READWRITE);
1493 # elif defined(darwin_HOST_OS)
1494 // In a Mach-O .o file, all sections can and will be misaligned
1495 // if the total size of the headers is not a multiple of the
1496 // desired alignment. This is fine for .o files that only serve
1497 // as input for the static linker, but it's not fine for us,
1498 // as SSE (used by gcc for floating point) and Altivec require
1499 // 16-byte alignment.
1500 // We calculate the correct alignment from the header before
1501 // reading the file, and then we misalign oc->image on purpose so
1502 // that the actual sections end up aligned again.
1503 oc->misalignment = machoGetMisalignment(f);
1504 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1505 oc->image += oc->misalignment;
1507 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1512 n = fread ( oc->image, 1, oc->fileSize, f );
1513 if (n != oc->fileSize)
1514 barf("loadObj: error whilst reading `%s'", path);
1517 #endif /* USE_MMAP */
1519 # if defined(OBJFORMAT_MACHO) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1520 r = ocAllocateSymbolExtras_MachO ( oc );
1521 if (!r) { return r; }
1522 # elif defined(OBJFORMAT_ELF) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1523 r = ocAllocateSymbolExtras_ELF ( oc );
1524 if (!r) { return r; }
1527 /* verify the in-memory image */
1528 # if defined(OBJFORMAT_ELF)
1529 r = ocVerifyImage_ELF ( oc );
1530 # elif defined(OBJFORMAT_PEi386)
1531 r = ocVerifyImage_PEi386 ( oc );
1532 # elif defined(OBJFORMAT_MACHO)
1533 r = ocVerifyImage_MachO ( oc );
1535 barf("loadObj: no verify method");
1537 if (!r) { return r; }
1539 /* build the symbol list for this image */
1540 # if defined(OBJFORMAT_ELF)
1541 r = ocGetNames_ELF ( oc );
1542 # elif defined(OBJFORMAT_PEi386)
1543 r = ocGetNames_PEi386 ( oc );
1544 # elif defined(OBJFORMAT_MACHO)
1545 r = ocGetNames_MachO ( oc );
1547 barf("loadObj: no getNames method");
1549 if (!r) { return r; }
1551 /* loaded, but not resolved yet */
1552 oc->status = OBJECT_LOADED;
1557 /* -----------------------------------------------------------------------------
1558 * resolve all the currently unlinked objects in memory
1560 * Returns: 1 if ok, 0 on error.
1570 for (oc = objects; oc; oc = oc->next) {
1571 if (oc->status != OBJECT_RESOLVED) {
1572 # if defined(OBJFORMAT_ELF)
1573 r = ocResolve_ELF ( oc );
1574 # elif defined(OBJFORMAT_PEi386)
1575 r = ocResolve_PEi386 ( oc );
1576 # elif defined(OBJFORMAT_MACHO)
1577 r = ocResolve_MachO ( oc );
1579 barf("resolveObjs: not implemented on this platform");
1581 if (!r) { return r; }
1582 oc->status = OBJECT_RESOLVED;
1588 /* -----------------------------------------------------------------------------
1589 * delete an object from the pool
1592 unloadObj( char *path )
1594 ObjectCode *oc, *prev;
1596 ASSERT(symhash != NULL);
1597 ASSERT(objects != NULL);
1602 for (oc = objects; oc; prev = oc, oc = oc->next) {
1603 if (!strcmp(oc->fileName,path)) {
1605 /* Remove all the mappings for the symbols within this
1610 for (i = 0; i < oc->n_symbols; i++) {
1611 if (oc->symbols[i] != NULL) {
1612 removeStrHashTable(symhash, oc->symbols[i], NULL);
1620 prev->next = oc->next;
1623 // We're going to leave this in place, in case there are
1624 // any pointers from the heap into it:
1625 // #ifdef mingw32_HOST_OS
1626 // VirtualFree(oc->image);
1628 // stgFree(oc->image);
1630 stgFree(oc->fileName);
1631 stgFree(oc->symbols);
1632 stgFree(oc->sections);
1638 errorBelch("unloadObj: can't find `%s' to unload", path);
1642 /* -----------------------------------------------------------------------------
1643 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1644 * which may be prodded during relocation, and abort if we try and write
1645 * outside any of these.
1647 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1650 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1651 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1655 pb->next = oc->proddables;
1656 oc->proddables = pb;
1659 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1662 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1663 char* s = (char*)(pb->start);
1664 char* e = s + pb->size - 1;
1665 char* a = (char*)addr;
1666 /* Assumes that the biggest fixup involves a 4-byte write. This
1667 probably needs to be changed to 8 (ie, +7) on 64-bit
1669 if (a >= s && (a+3) <= e) return;
1671 barf("checkProddableBlock: invalid fixup in runtime linker");
1674 /* -----------------------------------------------------------------------------
1675 * Section management.
1677 static void addSection ( ObjectCode* oc, SectionKind kind,
1678 void* start, void* end )
1680 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1684 s->next = oc->sections;
1687 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1688 start, ((char*)end)-1, end - start + 1, kind );
1693 /* --------------------------------------------------------------------------
1695 * This is about allocating a small chunk of memory for every symbol in the
1696 * object file. We make sure that the SymboLExtras are always "in range" of
1697 * limited-range PC-relative instructions on various platforms by allocating
1698 * them right next to the object code itself.
1701 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
1704 ocAllocateSymbolExtras
1706 Allocate additional space at the end of the object file image to make room
1707 for jump islands (powerpc, x86_64) and GOT entries (x86_64).
1709 PowerPC relative branch instructions have a 24 bit displacement field.
1710 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1711 If a particular imported symbol is outside this range, we have to redirect
1712 the jump to a short piece of new code that just loads the 32bit absolute
1713 address and jumps there.
1714 On x86_64, PC-relative jumps and PC-relative accesses to the GOT are limited
1717 This function just allocates space for one SymbolExtra for every
1718 undefined symbol in the object file. The code for the jump islands is
1719 filled in by makeSymbolExtra below.
1722 static int ocAllocateSymbolExtras( ObjectCode* oc, int count, int first )
1729 int misalignment = 0;
1730 #ifdef darwin_HOST_OS
1731 misalignment = oc->misalignment;
1737 // round up to the nearest 4
1738 aligned = (oc->fileSize + 3) & ~3;
1741 pagesize = getpagesize();
1742 n = ROUND_UP( oc->fileSize, pagesize );
1743 m = ROUND_UP( aligned + sizeof (SymbolExtra) * count, pagesize );
1745 /* we try to use spare space at the end of the last page of the
1746 * image for the jump islands, but if there isn't enough space
1747 * then we have to map some (anonymously, remembering MAP_32BIT).
1749 if( m > n ) // we need to allocate more pages
1751 oc->symbol_extras = mmapForLinker(sizeof(SymbolExtra) * count,
1756 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1759 oc->image -= misalignment;
1760 oc->image = stgReallocBytes( oc->image,
1762 aligned + sizeof (SymbolExtra) * count,
1763 "ocAllocateSymbolExtras" );
1764 oc->image += misalignment;
1766 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1767 #endif /* USE_MMAP */
1769 memset( oc->symbol_extras, 0, sizeof (SymbolExtra) * count );
1772 oc->symbol_extras = NULL;
1774 oc->first_symbol_extra = first;
1775 oc->n_symbol_extras = count;
1780 static SymbolExtra* makeSymbolExtra( ObjectCode* oc,
1781 unsigned long symbolNumber,
1782 unsigned long target )
1786 ASSERT( symbolNumber >= oc->first_symbol_extra
1787 && symbolNumber - oc->first_symbol_extra < oc->n_symbol_extras);
1789 extra = &oc->symbol_extras[symbolNumber - oc->first_symbol_extra];
1791 #ifdef powerpc_HOST_ARCH
1792 // lis r12, hi16(target)
1793 extra->jumpIsland.lis_r12 = 0x3d80;
1794 extra->jumpIsland.hi_addr = target >> 16;
1796 // ori r12, r12, lo16(target)
1797 extra->jumpIsland.ori_r12_r12 = 0x618c;
1798 extra->jumpIsland.lo_addr = target & 0xffff;
1801 extra->jumpIsland.mtctr_r12 = 0x7d8903a6;
1804 extra->jumpIsland.bctr = 0x4e800420;
1806 #ifdef x86_64_HOST_ARCH
1808 static uint8_t jmp[] = { 0xFF, 0x25, 0xF2, 0xFF, 0xFF, 0xFF };
1809 extra->addr = target;
1810 memcpy(extra->jumpIsland, jmp, 6);
1818 /* --------------------------------------------------------------------------
1819 * PowerPC specifics (instruction cache flushing)
1820 * ------------------------------------------------------------------------*/
1822 #ifdef powerpc_TARGET_ARCH
1824 ocFlushInstructionCache
1826 Flush the data & instruction caches.
1827 Because the PPC has split data/instruction caches, we have to
1828 do that whenever we modify code at runtime.
1831 static void ocFlushInstructionCache( ObjectCode *oc )
1833 int n = (oc->fileSize + sizeof( SymbolExtra ) * oc->n_symbol_extras + 3) / 4;
1834 unsigned long *p = (unsigned long *) oc->image;
1838 __asm__ volatile ( "dcbf 0,%0\n\t"
1846 __asm__ volatile ( "sync\n\t"
1852 /* --------------------------------------------------------------------------
1853 * PEi386 specifics (Win32 targets)
1854 * ------------------------------------------------------------------------*/
1856 /* The information for this linker comes from
1857 Microsoft Portable Executable
1858 and Common Object File Format Specification
1859 revision 5.1 January 1998
1860 which SimonM says comes from the MS Developer Network CDs.
1862 It can be found there (on older CDs), but can also be found
1865 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1867 (this is Rev 6.0 from February 1999).
1869 Things move, so if that fails, try searching for it via
1871 http://www.google.com/search?q=PE+COFF+specification
1873 The ultimate reference for the PE format is the Winnt.h
1874 header file that comes with the Platform SDKs; as always,
1875 implementations will drift wrt their documentation.
1877 A good background article on the PE format is Matt Pietrek's
1878 March 1994 article in Microsoft System Journal (MSJ)
1879 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1880 Win32 Portable Executable File Format." The info in there
1881 has recently been updated in a two part article in
1882 MSDN magazine, issues Feb and March 2002,
1883 "Inside Windows: An In-Depth Look into the Win32 Portable
1884 Executable File Format"
1886 John Levine's book "Linkers and Loaders" contains useful
1891 #if defined(OBJFORMAT_PEi386)
1895 typedef unsigned char UChar;
1896 typedef unsigned short UInt16;
1897 typedef unsigned int UInt32;
1904 UInt16 NumberOfSections;
1905 UInt32 TimeDateStamp;
1906 UInt32 PointerToSymbolTable;
1907 UInt32 NumberOfSymbols;
1908 UInt16 SizeOfOptionalHeader;
1909 UInt16 Characteristics;
1913 #define sizeof_COFF_header 20
1920 UInt32 VirtualAddress;
1921 UInt32 SizeOfRawData;
1922 UInt32 PointerToRawData;
1923 UInt32 PointerToRelocations;
1924 UInt32 PointerToLinenumbers;
1925 UInt16 NumberOfRelocations;
1926 UInt16 NumberOfLineNumbers;
1927 UInt32 Characteristics;
1931 #define sizeof_COFF_section 40
1938 UInt16 SectionNumber;
1941 UChar NumberOfAuxSymbols;
1945 #define sizeof_COFF_symbol 18
1950 UInt32 VirtualAddress;
1951 UInt32 SymbolTableIndex;
1956 #define sizeof_COFF_reloc 10
1959 /* From PE spec doc, section 3.3.2 */
1960 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1961 windows.h -- for the same purpose, but I want to know what I'm
1963 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1964 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1965 #define MYIMAGE_FILE_DLL 0x2000
1966 #define MYIMAGE_FILE_SYSTEM 0x1000
1967 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1968 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1969 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1971 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1972 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1973 #define MYIMAGE_SYM_CLASS_STATIC 3
1974 #define MYIMAGE_SYM_UNDEFINED 0
1976 /* From PE spec doc, section 4.1 */
1977 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1978 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1979 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1981 /* From PE spec doc, section 5.2.1 */
1982 #define MYIMAGE_REL_I386_DIR32 0x0006
1983 #define MYIMAGE_REL_I386_REL32 0x0014
1986 /* We use myindex to calculate array addresses, rather than
1987 simply doing the normal subscript thing. That's because
1988 some of the above structs have sizes which are not
1989 a whole number of words. GCC rounds their sizes up to a
1990 whole number of words, which means that the address calcs
1991 arising from using normal C indexing or pointer arithmetic
1992 are just plain wrong. Sigh.
1995 myindex ( int scale, void* base, int index )
1998 ((UChar*)base) + scale * index;
2003 printName ( UChar* name, UChar* strtab )
2005 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2006 UInt32 strtab_offset = * (UInt32*)(name+4);
2007 debugBelch("%s", strtab + strtab_offset );
2010 for (i = 0; i < 8; i++) {
2011 if (name[i] == 0) break;
2012 debugBelch("%c", name[i] );
2019 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
2021 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2022 UInt32 strtab_offset = * (UInt32*)(name+4);
2023 strncpy ( dst, strtab+strtab_offset, dstSize );
2029 if (name[i] == 0) break;
2039 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
2042 /* If the string is longer than 8 bytes, look in the
2043 string table for it -- this will be correctly zero terminated.
2045 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2046 UInt32 strtab_offset = * (UInt32*)(name+4);
2047 return ((UChar*)strtab) + strtab_offset;
2049 /* Otherwise, if shorter than 8 bytes, return the original,
2050 which by defn is correctly terminated.
2052 if (name[7]==0) return name;
2053 /* The annoying case: 8 bytes. Copy into a temporary
2054 (which is never freed ...)
2056 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
2058 strncpy(newstr,name,8);
2064 /* Just compares the short names (first 8 chars) */
2065 static COFF_section *
2066 findPEi386SectionCalled ( ObjectCode* oc, char* name )
2070 = (COFF_header*)(oc->image);
2071 COFF_section* sectab
2073 ((UChar*)(oc->image))
2074 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2076 for (i = 0; i < hdr->NumberOfSections; i++) {
2079 COFF_section* section_i
2081 myindex ( sizeof_COFF_section, sectab, i );
2082 n1 = (UChar*) &(section_i->Name);
2084 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
2085 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
2086 n1[6]==n2[6] && n1[7]==n2[7])
2095 zapTrailingAtSign ( UChar* sym )
2097 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
2099 if (sym[0] == 0) return;
2101 while (sym[i] != 0) i++;
2104 while (j > 0 && my_isdigit(sym[j])) j--;
2105 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
2110 lookupSymbolInDLLs ( UChar *lbl )
2115 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
2116 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
2118 if (lbl[0] == '_') {
2119 /* HACK: if the name has an initial underscore, try stripping
2120 it off & look that up first. I've yet to verify whether there's
2121 a Rule that governs whether an initial '_' *should always* be
2122 stripped off when mapping from import lib name to the DLL name.
2124 sym = GetProcAddress(o_dll->instance, (lbl+1));
2126 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
2130 sym = GetProcAddress(o_dll->instance, lbl);
2132 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
2141 ocVerifyImage_PEi386 ( ObjectCode* oc )
2146 COFF_section* sectab;
2147 COFF_symbol* symtab;
2149 /* debugBelch("\nLOADING %s\n", oc->fileName); */
2150 hdr = (COFF_header*)(oc->image);
2151 sectab = (COFF_section*) (
2152 ((UChar*)(oc->image))
2153 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2155 symtab = (COFF_symbol*) (
2156 ((UChar*)(oc->image))
2157 + hdr->PointerToSymbolTable
2159 strtab = ((UChar*)symtab)
2160 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2162 if (hdr->Machine != 0x14c) {
2163 errorBelch("%s: Not x86 PEi386", oc->fileName);
2166 if (hdr->SizeOfOptionalHeader != 0) {
2167 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2170 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2171 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2172 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2173 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2174 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2177 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2178 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2179 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2181 (int)(hdr->Characteristics));
2184 /* If the string table size is way crazy, this might indicate that
2185 there are more than 64k relocations, despite claims to the
2186 contrary. Hence this test. */
2187 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2189 if ( (*(UInt32*)strtab) > 600000 ) {
2190 /* Note that 600k has no special significance other than being
2191 big enough to handle the almost-2MB-sized lumps that
2192 constitute HSwin32*.o. */
2193 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2198 /* No further verification after this point; only debug printing. */
2200 IF_DEBUG(linker, i=1);
2201 if (i == 0) return 1;
2203 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2204 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2205 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2208 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2209 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2210 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2211 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2212 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2213 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2214 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2216 /* Print the section table. */
2218 for (i = 0; i < hdr->NumberOfSections; i++) {
2220 COFF_section* sectab_i
2222 myindex ( sizeof_COFF_section, sectab, i );
2229 printName ( sectab_i->Name, strtab );
2239 sectab_i->VirtualSize,
2240 sectab_i->VirtualAddress,
2241 sectab_i->SizeOfRawData,
2242 sectab_i->PointerToRawData,
2243 sectab_i->NumberOfRelocations,
2244 sectab_i->PointerToRelocations,
2245 sectab_i->PointerToRawData
2247 reltab = (COFF_reloc*) (
2248 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2251 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2252 /* If the relocation field (a short) has overflowed, the
2253 * real count can be found in the first reloc entry.
2255 * See Section 4.1 (last para) of the PE spec (rev6.0).
2257 COFF_reloc* rel = (COFF_reloc*)
2258 myindex ( sizeof_COFF_reloc, reltab, 0 );
2259 noRelocs = rel->VirtualAddress;
2262 noRelocs = sectab_i->NumberOfRelocations;
2266 for (; j < noRelocs; j++) {
2268 COFF_reloc* rel = (COFF_reloc*)
2269 myindex ( sizeof_COFF_reloc, reltab, j );
2271 " type 0x%-4x vaddr 0x%-8x name `",
2273 rel->VirtualAddress );
2274 sym = (COFF_symbol*)
2275 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2276 /* Hmm..mysterious looking offset - what's it for? SOF */
2277 printName ( sym->Name, strtab -10 );
2284 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2285 debugBelch("---START of string table---\n");
2286 for (i = 4; i < *(Int32*)strtab; i++) {
2288 debugBelch("\n"); else
2289 debugBelch("%c", strtab[i] );
2291 debugBelch("--- END of string table---\n");
2296 COFF_symbol* symtab_i;
2297 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2298 symtab_i = (COFF_symbol*)
2299 myindex ( sizeof_COFF_symbol, symtab, i );
2305 printName ( symtab_i->Name, strtab );
2314 (Int32)(symtab_i->SectionNumber),
2315 (UInt32)symtab_i->Type,
2316 (UInt32)symtab_i->StorageClass,
2317 (UInt32)symtab_i->NumberOfAuxSymbols
2319 i += symtab_i->NumberOfAuxSymbols;
2329 ocGetNames_PEi386 ( ObjectCode* oc )
2332 COFF_section* sectab;
2333 COFF_symbol* symtab;
2340 hdr = (COFF_header*)(oc->image);
2341 sectab = (COFF_section*) (
2342 ((UChar*)(oc->image))
2343 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2345 symtab = (COFF_symbol*) (
2346 ((UChar*)(oc->image))
2347 + hdr->PointerToSymbolTable
2349 strtab = ((UChar*)(oc->image))
2350 + hdr->PointerToSymbolTable
2351 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2353 /* Allocate space for any (local, anonymous) .bss sections. */
2355 for (i = 0; i < hdr->NumberOfSections; i++) {
2358 COFF_section* sectab_i
2360 myindex ( sizeof_COFF_section, sectab, i );
2361 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2362 /* sof 10/05: the PE spec text isn't too clear regarding what
2363 * the SizeOfRawData field is supposed to hold for object
2364 * file sections containing just uninitialized data -- for executables,
2365 * it is supposed to be zero; unclear what it's supposed to be
2366 * for object files. However, VirtualSize is guaranteed to be
2367 * zero for object files, which definitely suggests that SizeOfRawData
2368 * will be non-zero (where else would the size of this .bss section be
2369 * stored?) Looking at the COFF_section info for incoming object files,
2370 * this certainly appears to be the case.
2372 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2373 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2374 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2375 * variable decls into to the .bss section. (The specific function in Q which
2376 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2378 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2379 /* This is a non-empty .bss section. Allocate zeroed space for
2380 it, and set its PointerToRawData field such that oc->image +
2381 PointerToRawData == addr_of_zeroed_space. */
2382 bss_sz = sectab_i->VirtualSize;
2383 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2384 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2385 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2386 addProddableBlock(oc, zspace, bss_sz);
2387 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2390 /* Copy section information into the ObjectCode. */
2392 for (i = 0; i < hdr->NumberOfSections; i++) {
2398 = SECTIONKIND_OTHER;
2399 COFF_section* sectab_i
2401 myindex ( sizeof_COFF_section, sectab, i );
2402 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2405 /* I'm sure this is the Right Way to do it. However, the
2406 alternative of testing the sectab_i->Name field seems to
2407 work ok with Cygwin.
2409 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2410 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2411 kind = SECTIONKIND_CODE_OR_RODATA;
2414 if (0==strcmp(".text",sectab_i->Name) ||
2415 0==strcmp(".rdata",sectab_i->Name)||
2416 0==strcmp(".rodata",sectab_i->Name))
2417 kind = SECTIONKIND_CODE_OR_RODATA;
2418 if (0==strcmp(".data",sectab_i->Name) ||
2419 0==strcmp(".bss",sectab_i->Name))
2420 kind = SECTIONKIND_RWDATA;
2422 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2423 sz = sectab_i->SizeOfRawData;
2424 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2426 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2427 end = start + sz - 1;
2429 if (kind == SECTIONKIND_OTHER
2430 /* Ignore sections called which contain stabs debugging
2432 && 0 != strcmp(".stab", sectab_i->Name)
2433 && 0 != strcmp(".stabstr", sectab_i->Name)
2434 /* ignore constructor section for now */
2435 && 0 != strcmp(".ctors", sectab_i->Name)
2436 /* ignore section generated from .ident */
2437 && 0!= strcmp("/4", sectab_i->Name)
2438 /* ignore unknown section that appeared in gcc 3.4.5(?) */
2439 && 0!= strcmp(".reloc", sectab_i->Name)
2441 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2445 if (kind != SECTIONKIND_OTHER && end >= start) {
2446 addSection(oc, kind, start, end);
2447 addProddableBlock(oc, start, end - start + 1);
2451 /* Copy exported symbols into the ObjectCode. */
2453 oc->n_symbols = hdr->NumberOfSymbols;
2454 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2455 "ocGetNames_PEi386(oc->symbols)");
2456 /* Call me paranoid; I don't care. */
2457 for (i = 0; i < oc->n_symbols; i++)
2458 oc->symbols[i] = NULL;
2462 COFF_symbol* symtab_i;
2463 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2464 symtab_i = (COFF_symbol*)
2465 myindex ( sizeof_COFF_symbol, symtab, i );
2469 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2470 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2471 /* This symbol is global and defined, viz, exported */
2472 /* for MYIMAGE_SYMCLASS_EXTERNAL
2473 && !MYIMAGE_SYM_UNDEFINED,
2474 the address of the symbol is:
2475 address of relevant section + offset in section
2477 COFF_section* sectabent
2478 = (COFF_section*) myindex ( sizeof_COFF_section,
2480 symtab_i->SectionNumber-1 );
2481 addr = ((UChar*)(oc->image))
2482 + (sectabent->PointerToRawData
2486 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2487 && symtab_i->Value > 0) {
2488 /* This symbol isn't in any section at all, ie, global bss.
2489 Allocate zeroed space for it. */
2490 addr = stgCallocBytes(1, symtab_i->Value,
2491 "ocGetNames_PEi386(non-anonymous bss)");
2492 addSection(oc, SECTIONKIND_RWDATA, addr,
2493 ((UChar*)addr) + symtab_i->Value - 1);
2494 addProddableBlock(oc, addr, symtab_i->Value);
2495 /* debugBelch("BSS section at 0x%x\n", addr); */
2498 if (addr != NULL ) {
2499 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2500 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2501 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2502 ASSERT(i >= 0 && i < oc->n_symbols);
2503 /* cstring_from_COFF_symbol_name always succeeds. */
2504 oc->symbols[i] = sname;
2505 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2509 "IGNORING symbol %d\n"
2513 printName ( symtab_i->Name, strtab );
2522 (Int32)(symtab_i->SectionNumber),
2523 (UInt32)symtab_i->Type,
2524 (UInt32)symtab_i->StorageClass,
2525 (UInt32)symtab_i->NumberOfAuxSymbols
2530 i += symtab_i->NumberOfAuxSymbols;
2539 ocResolve_PEi386 ( ObjectCode* oc )
2542 COFF_section* sectab;
2543 COFF_symbol* symtab;
2553 /* ToDo: should be variable-sized? But is at least safe in the
2554 sense of buffer-overrun-proof. */
2556 /* debugBelch("resolving for %s\n", oc->fileName); */
2558 hdr = (COFF_header*)(oc->image);
2559 sectab = (COFF_section*) (
2560 ((UChar*)(oc->image))
2561 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2563 symtab = (COFF_symbol*) (
2564 ((UChar*)(oc->image))
2565 + hdr->PointerToSymbolTable
2567 strtab = ((UChar*)(oc->image))
2568 + hdr->PointerToSymbolTable
2569 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2571 for (i = 0; i < hdr->NumberOfSections; i++) {
2572 COFF_section* sectab_i
2574 myindex ( sizeof_COFF_section, sectab, i );
2577 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2580 /* Ignore sections called which contain stabs debugging
2582 if (0 == strcmp(".stab", sectab_i->Name)
2583 || 0 == strcmp(".stabstr", sectab_i->Name)
2584 || 0 == strcmp(".ctors", sectab_i->Name))
2587 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2588 /* If the relocation field (a short) has overflowed, the
2589 * real count can be found in the first reloc entry.
2591 * See Section 4.1 (last para) of the PE spec (rev6.0).
2593 * Nov2003 update: the GNU linker still doesn't correctly
2594 * handle the generation of relocatable object files with
2595 * overflown relocations. Hence the output to warn of potential
2598 COFF_reloc* rel = (COFF_reloc*)
2599 myindex ( sizeof_COFF_reloc, reltab, 0 );
2600 noRelocs = rel->VirtualAddress;
2602 /* 10/05: we now assume (and check for) a GNU ld that is capable
2603 * of handling object files with (>2^16) of relocs.
2606 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2611 noRelocs = sectab_i->NumberOfRelocations;
2616 for (; j < noRelocs; j++) {
2618 COFF_reloc* reltab_j
2620 myindex ( sizeof_COFF_reloc, reltab, j );
2622 /* the location to patch */
2624 ((UChar*)(oc->image))
2625 + (sectab_i->PointerToRawData
2626 + reltab_j->VirtualAddress
2627 - sectab_i->VirtualAddress )
2629 /* the existing contents of pP */
2631 /* the symbol to connect to */
2632 sym = (COFF_symbol*)
2633 myindex ( sizeof_COFF_symbol,
2634 symtab, reltab_j->SymbolTableIndex );
2637 "reloc sec %2d num %3d: type 0x%-4x "
2638 "vaddr 0x%-8x name `",
2640 (UInt32)reltab_j->Type,
2641 reltab_j->VirtualAddress );
2642 printName ( sym->Name, strtab );
2643 debugBelch("'\n" ));
2645 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2646 COFF_section* section_sym
2647 = findPEi386SectionCalled ( oc, sym->Name );
2649 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2652 S = ((UInt32)(oc->image))
2653 + (section_sym->PointerToRawData
2656 copyName ( sym->Name, strtab, symbol, 1000-1 );
2657 S = (UInt32) lookupSymbol( symbol );
2658 if ((void*)S != NULL) goto foundit;
2659 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
2663 checkProddableBlock(oc, pP);
2664 switch (reltab_j->Type) {
2665 case MYIMAGE_REL_I386_DIR32:
2668 case MYIMAGE_REL_I386_REL32:
2669 /* Tricky. We have to insert a displacement at
2670 pP which, when added to the PC for the _next_
2671 insn, gives the address of the target (S).
2672 Problem is to know the address of the next insn
2673 when we only know pP. We assume that this
2674 literal field is always the last in the insn,
2675 so that the address of the next insn is pP+4
2676 -- hence the constant 4.
2677 Also I don't know if A should be added, but so
2678 far it has always been zero.
2680 SOF 05/2005: 'A' (old contents of *pP) have been observed
2681 to contain values other than zero (the 'wx' object file
2682 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2683 So, add displacement to old value instead of asserting
2684 A to be zero. Fixes wxhaskell-related crashes, and no other
2685 ill effects have been observed.
2687 Update: the reason why we're seeing these more elaborate
2688 relocations is due to a switch in how the NCG compiles SRTs
2689 and offsets to them from info tables. SRTs live in .(ro)data,
2690 while info tables live in .text, causing GAS to emit REL32/DISP32
2691 relocations with non-zero values. Adding the displacement is
2692 the right thing to do.
2694 *pP = S - ((UInt32)pP) - 4 + A;
2697 debugBelch("%s: unhandled PEi386 relocation type %d",
2698 oc->fileName, reltab_j->Type);
2705 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2709 #endif /* defined(OBJFORMAT_PEi386) */
2712 /* --------------------------------------------------------------------------
2714 * ------------------------------------------------------------------------*/
2716 #if defined(OBJFORMAT_ELF)
2721 #if defined(sparc_HOST_ARCH)
2722 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2723 #elif defined(i386_HOST_ARCH)
2724 # define ELF_TARGET_386 /* Used inside <elf.h> */
2725 #elif defined(x86_64_HOST_ARCH)
2726 # define ELF_TARGET_X64_64
2728 #elif defined (ia64_HOST_ARCH)
2729 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2731 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2732 # define ELF_NEED_GOT /* needs Global Offset Table */
2733 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2736 #if !defined(openbsd_HOST_OS)
2739 /* openbsd elf has things in different places, with diff names */
2740 # include <elf_abi.h>
2741 # include <machine/reloc.h>
2742 # define R_386_32 RELOC_32
2743 # define R_386_PC32 RELOC_PC32
2746 /* If elf.h doesn't define it */
2747 # ifndef R_X86_64_PC64
2748 # define R_X86_64_PC64 24
2752 * Define a set of types which can be used for both ELF32 and ELF64
2756 #define ELFCLASS ELFCLASS64
2757 #define Elf_Addr Elf64_Addr
2758 #define Elf_Word Elf64_Word
2759 #define Elf_Sword Elf64_Sword
2760 #define Elf_Ehdr Elf64_Ehdr
2761 #define Elf_Phdr Elf64_Phdr
2762 #define Elf_Shdr Elf64_Shdr
2763 #define Elf_Sym Elf64_Sym
2764 #define Elf_Rel Elf64_Rel
2765 #define Elf_Rela Elf64_Rela
2766 #define ELF_ST_TYPE ELF64_ST_TYPE
2767 #define ELF_ST_BIND ELF64_ST_BIND
2768 #define ELF_R_TYPE ELF64_R_TYPE
2769 #define ELF_R_SYM ELF64_R_SYM
2771 #define ELFCLASS ELFCLASS32
2772 #define Elf_Addr Elf32_Addr
2773 #define Elf_Word Elf32_Word
2774 #define Elf_Sword Elf32_Sword
2775 #define Elf_Ehdr Elf32_Ehdr
2776 #define Elf_Phdr Elf32_Phdr
2777 #define Elf_Shdr Elf32_Shdr
2778 #define Elf_Sym Elf32_Sym
2779 #define Elf_Rel Elf32_Rel
2780 #define Elf_Rela Elf32_Rela
2782 #define ELF_ST_TYPE ELF32_ST_TYPE
2785 #define ELF_ST_BIND ELF32_ST_BIND
2788 #define ELF_R_TYPE ELF32_R_TYPE
2791 #define ELF_R_SYM ELF32_R_SYM
2797 * Functions to allocate entries in dynamic sections. Currently we simply
2798 * preallocate a large number, and we don't check if a entry for the given
2799 * target already exists (a linear search is too slow). Ideally these
2800 * entries would be associated with symbols.
2803 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2804 #define GOT_SIZE 0x20000
2805 #define FUNCTION_TABLE_SIZE 0x10000
2806 #define PLT_SIZE 0x08000
2809 static Elf_Addr got[GOT_SIZE];
2810 static unsigned int gotIndex;
2811 static Elf_Addr gp_val = (Elf_Addr)got;
2814 allocateGOTEntry(Elf_Addr target)
2818 if (gotIndex >= GOT_SIZE)
2819 barf("Global offset table overflow");
2821 entry = &got[gotIndex++];
2823 return (Elf_Addr)entry;
2827 #ifdef ELF_FUNCTION_DESC
2833 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2834 static unsigned int functionTableIndex;
2837 allocateFunctionDesc(Elf_Addr target)
2839 FunctionDesc *entry;
2841 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2842 barf("Function table overflow");
2844 entry = &functionTable[functionTableIndex++];
2846 entry->gp = (Elf_Addr)gp_val;
2847 return (Elf_Addr)entry;
2851 copyFunctionDesc(Elf_Addr target)
2853 FunctionDesc *olddesc = (FunctionDesc *)target;
2854 FunctionDesc *newdesc;
2856 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2857 newdesc->gp = olddesc->gp;
2858 return (Elf_Addr)newdesc;
2863 #ifdef ia64_HOST_ARCH
2864 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2865 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2867 static unsigned char plt_code[] =
2869 /* taken from binutils bfd/elfxx-ia64.c */
2870 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2871 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2872 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2873 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2874 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2875 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2878 /* If we can't get to the function descriptor via gp, take a local copy of it */
2879 #define PLT_RELOC(code, target) { \
2880 Elf64_Sxword rel_value = target - gp_val; \
2881 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2882 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2884 ia64_reloc_gprel22((Elf_Addr)code, target); \
2889 unsigned char code[sizeof(plt_code)];
2893 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2895 PLTEntry *plt = (PLTEntry *)oc->plt;
2898 if (oc->pltIndex >= PLT_SIZE)
2899 barf("Procedure table overflow");
2901 entry = &plt[oc->pltIndex++];
2902 memcpy(entry->code, plt_code, sizeof(entry->code));
2903 PLT_RELOC(entry->code, target);
2904 return (Elf_Addr)entry;
2910 return (PLT_SIZE * sizeof(PLTEntry));
2916 * Generic ELF functions
2920 findElfSection ( void* objImage, Elf_Word sh_type )
2922 char* ehdrC = (char*)objImage;
2923 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2924 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2925 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2929 for (i = 0; i < ehdr->e_shnum; i++) {
2930 if (shdr[i].sh_type == sh_type
2931 /* Ignore the section header's string table. */
2932 && i != ehdr->e_shstrndx
2933 /* Ignore string tables named .stabstr, as they contain
2935 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2937 ptr = ehdrC + shdr[i].sh_offset;
2944 #if defined(ia64_HOST_ARCH)
2946 findElfSegment ( void* objImage, Elf_Addr vaddr )
2948 char* ehdrC = (char*)objImage;
2949 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2950 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2951 Elf_Addr segaddr = 0;
2954 for (i = 0; i < ehdr->e_phnum; i++) {
2955 segaddr = phdr[i].p_vaddr;
2956 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2964 ocVerifyImage_ELF ( ObjectCode* oc )
2968 int i, j, nent, nstrtab, nsymtabs;
2972 char* ehdrC = (char*)(oc->image);
2973 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2975 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2976 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2977 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2978 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2979 errorBelch("%s: not an ELF object", oc->fileName);
2983 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2984 errorBelch("%s: unsupported ELF format", oc->fileName);
2988 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2989 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2991 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2992 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2994 errorBelch("%s: unknown endiannness", oc->fileName);
2998 if (ehdr->e_type != ET_REL) {
2999 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
3002 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
3004 IF_DEBUG(linker,debugBelch( "Architecture is " ));
3005 switch (ehdr->e_machine) {
3006 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
3007 #ifdef EM_SPARC32PLUS
3008 case EM_SPARC32PLUS:
3010 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
3012 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
3014 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
3016 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
3017 #elif defined(EM_AMD64)
3018 case EM_AMD64: IF_DEBUG(linker,debugBelch( "amd64" )); break;
3020 default: IF_DEBUG(linker,debugBelch( "unknown" ));
3021 errorBelch("%s: unknown architecture (e_machine == %d)"
3022 , oc->fileName, ehdr->e_machine);
3026 IF_DEBUG(linker,debugBelch(
3027 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
3028 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
3030 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
3032 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3034 if (ehdr->e_shstrndx == SHN_UNDEF) {
3035 errorBelch("%s: no section header string table", oc->fileName);
3038 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
3040 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
3043 for (i = 0; i < ehdr->e_shnum; i++) {
3044 IF_DEBUG(linker,debugBelch("%2d: ", i ));
3045 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
3046 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
3047 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
3048 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
3049 ehdrC + shdr[i].sh_offset,
3050 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
3052 if (shdr[i].sh_type == SHT_REL) {
3053 IF_DEBUG(linker,debugBelch("Rel " ));
3054 } else if (shdr[i].sh_type == SHT_RELA) {
3055 IF_DEBUG(linker,debugBelch("RelA " ));
3057 IF_DEBUG(linker,debugBelch(" "));
3060 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
3064 IF_DEBUG(linker,debugBelch( "\nString tables" ));
3067 for (i = 0; i < ehdr->e_shnum; i++) {
3068 if (shdr[i].sh_type == SHT_STRTAB
3069 /* Ignore the section header's string table. */
3070 && i != ehdr->e_shstrndx
3071 /* Ignore string tables named .stabstr, as they contain
3073 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
3075 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
3076 strtab = ehdrC + shdr[i].sh_offset;
3081 errorBelch("%s: no string tables, or too many", oc->fileName);
3086 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
3087 for (i = 0; i < ehdr->e_shnum; i++) {
3088 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3089 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
3091 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3092 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3093 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
3095 (long)shdr[i].sh_size % sizeof(Elf_Sym)
3097 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
3098 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
3101 for (j = 0; j < nent; j++) {
3102 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3103 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3104 (int)stab[j].st_shndx,
3105 (int)stab[j].st_size,
3106 (char*)stab[j].st_value ));
3108 IF_DEBUG(linker,debugBelch("type=" ));
3109 switch (ELF_ST_TYPE(stab[j].st_info)) {
3110 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3111 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3112 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3113 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3114 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3115 default: IF_DEBUG(linker,debugBelch("? " )); break;
3117 IF_DEBUG(linker,debugBelch(" " ));
3119 IF_DEBUG(linker,debugBelch("bind=" ));
3120 switch (ELF_ST_BIND(stab[j].st_info)) {
3121 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3122 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3123 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3124 default: IF_DEBUG(linker,debugBelch("? " )); break;
3126 IF_DEBUG(linker,debugBelch(" " ));
3128 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3132 if (nsymtabs == 0) {
3133 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3140 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3144 if (hdr->sh_type == SHT_PROGBITS
3145 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3146 /* .text-style section */
3147 return SECTIONKIND_CODE_OR_RODATA;
3150 if (hdr->sh_type == SHT_PROGBITS
3151 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3152 /* .data-style section */
3153 return SECTIONKIND_RWDATA;
3156 if (hdr->sh_type == SHT_PROGBITS
3157 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3158 /* .rodata-style section */
3159 return SECTIONKIND_CODE_OR_RODATA;
3162 if (hdr->sh_type == SHT_NOBITS
3163 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3164 /* .bss-style section */
3166 return SECTIONKIND_RWDATA;
3169 return SECTIONKIND_OTHER;
3174 ocGetNames_ELF ( ObjectCode* oc )
3179 char* ehdrC = (char*)(oc->image);
3180 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3181 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3182 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3184 ASSERT(symhash != NULL);
3187 errorBelch("%s: no strtab", oc->fileName);
3192 for (i = 0; i < ehdr->e_shnum; i++) {
3193 /* Figure out what kind of section it is. Logic derived from
3194 Figure 1.14 ("Special Sections") of the ELF document
3195 ("Portable Formats Specification, Version 1.1"). */
3197 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3199 if (is_bss && shdr[i].sh_size > 0) {
3200 /* This is a non-empty .bss section. Allocate zeroed space for
3201 it, and set its .sh_offset field such that
3202 ehdrC + .sh_offset == addr_of_zeroed_space. */
3203 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3204 "ocGetNames_ELF(BSS)");
3205 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3207 debugBelch("BSS section at 0x%x, size %d\n",
3208 zspace, shdr[i].sh_size);
3212 /* fill in the section info */
3213 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3214 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3215 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3216 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3219 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3221 /* copy stuff into this module's object symbol table */
3222 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3223 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3225 oc->n_symbols = nent;
3226 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3227 "ocGetNames_ELF(oc->symbols)");
3229 for (j = 0; j < nent; j++) {
3231 char isLocal = FALSE; /* avoids uninit-var warning */
3233 char* nm = strtab + stab[j].st_name;
3234 int secno = stab[j].st_shndx;
3236 /* Figure out if we want to add it; if so, set ad to its
3237 address. Otherwise leave ad == NULL. */
3239 if (secno == SHN_COMMON) {
3241 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3243 debugBelch("COMMON symbol, size %d name %s\n",
3244 stab[j].st_size, nm);
3246 /* Pointless to do addProddableBlock() for this area,
3247 since the linker should never poke around in it. */
3250 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3251 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3253 /* and not an undefined symbol */
3254 && stab[j].st_shndx != SHN_UNDEF
3255 /* and not in a "special section" */
3256 && stab[j].st_shndx < SHN_LORESERVE
3258 /* and it's a not a section or string table or anything silly */
3259 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3260 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3261 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3264 /* Section 0 is the undefined section, hence > and not >=. */
3265 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3267 if (shdr[secno].sh_type == SHT_NOBITS) {
3268 debugBelch(" BSS symbol, size %d off %d name %s\n",
3269 stab[j].st_size, stab[j].st_value, nm);
3272 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3273 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3276 #ifdef ELF_FUNCTION_DESC
3277 /* dlsym() and the initialisation table both give us function
3278 * descriptors, so to be consistent we store function descriptors
3279 * in the symbol table */
3280 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3281 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3283 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s\n",
3284 ad, oc->fileName, nm ));
3289 /* And the decision is ... */
3293 oc->symbols[j] = nm;
3296 /* Ignore entirely. */
3298 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3302 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3303 strtab + stab[j].st_name ));
3306 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3307 (int)ELF_ST_BIND(stab[j].st_info),
3308 (int)ELF_ST_TYPE(stab[j].st_info),
3309 (int)stab[j].st_shndx,
3310 strtab + stab[j].st_name
3313 oc->symbols[j] = NULL;
3322 /* Do ELF relocations which lack an explicit addend. All x86-linux
3323 relocations appear to be of this form. */
3325 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3326 Elf_Shdr* shdr, int shnum,
3327 Elf_Sym* stab, char* strtab )
3332 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3333 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3334 int target_shndx = shdr[shnum].sh_info;
3335 int symtab_shndx = shdr[shnum].sh_link;
3337 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3338 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3339 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3340 target_shndx, symtab_shndx ));
3342 /* Skip sections that we're not interested in. */
3345 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3346 if (kind == SECTIONKIND_OTHER) {
3347 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3352 for (j = 0; j < nent; j++) {
3353 Elf_Addr offset = rtab[j].r_offset;
3354 Elf_Addr info = rtab[j].r_info;
3356 Elf_Addr P = ((Elf_Addr)targ) + offset;
3357 Elf_Word* pP = (Elf_Word*)P;
3362 StgStablePtr stablePtr;
3365 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3366 j, (void*)offset, (void*)info ));
3368 IF_DEBUG(linker,debugBelch( " ZERO" ));
3371 Elf_Sym sym = stab[ELF_R_SYM(info)];
3372 /* First see if it is a local symbol. */
3373 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3374 /* Yes, so we can get the address directly from the ELF symbol
3376 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3378 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3379 + stab[ELF_R_SYM(info)].st_value);
3382 symbol = strtab + sym.st_name;
3383 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3384 if (NULL == stablePtr) {
3385 /* No, so look up the name in our global table. */
3386 S_tmp = lookupSymbol( symbol );
3387 S = (Elf_Addr)S_tmp;
3389 stableVal = deRefStablePtr( stablePtr );
3391 S = (Elf_Addr)S_tmp;
3395 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3398 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3401 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3402 (void*)P, (void*)S, (void*)A ));
3403 checkProddableBlock ( oc, pP );
3407 switch (ELF_R_TYPE(info)) {
3408 # ifdef i386_HOST_ARCH
3409 case R_386_32: *pP = value; break;
3410 case R_386_PC32: *pP = value - P; break;
3413 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3414 oc->fileName, (lnat)ELF_R_TYPE(info));
3422 /* Do ELF relocations for which explicit addends are supplied.
3423 sparc-solaris relocations appear to be of this form. */
3425 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3426 Elf_Shdr* shdr, int shnum,
3427 Elf_Sym* stab, char* strtab )
3430 char *symbol = NULL;
3432 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3433 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3434 int target_shndx = shdr[shnum].sh_info;
3435 int symtab_shndx = shdr[shnum].sh_link;
3437 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3438 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3439 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3440 target_shndx, symtab_shndx ));
3442 for (j = 0; j < nent; j++) {
3443 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3444 /* This #ifdef only serves to avoid unused-var warnings. */
3445 Elf_Addr offset = rtab[j].r_offset;
3446 Elf_Addr P = targ + offset;
3448 Elf_Addr info = rtab[j].r_info;
3449 Elf_Addr A = rtab[j].r_addend;
3453 # if defined(sparc_HOST_ARCH)
3454 Elf_Word* pP = (Elf_Word*)P;
3456 # elif defined(ia64_HOST_ARCH)
3457 Elf64_Xword *pP = (Elf64_Xword *)P;
3459 # elif defined(powerpc_HOST_ARCH)
3463 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3464 j, (void*)offset, (void*)info,
3467 IF_DEBUG(linker,debugBelch( " ZERO" ));
3470 Elf_Sym sym = stab[ELF_R_SYM(info)];
3471 /* First see if it is a local symbol. */
3472 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3473 /* Yes, so we can get the address directly from the ELF symbol
3475 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3477 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3478 + stab[ELF_R_SYM(info)].st_value);
3479 #ifdef ELF_FUNCTION_DESC
3480 /* Make a function descriptor for this function */
3481 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3482 S = allocateFunctionDesc(S + A);
3487 /* No, so look up the name in our global table. */
3488 symbol = strtab + sym.st_name;
3489 S_tmp = lookupSymbol( symbol );
3490 S = (Elf_Addr)S_tmp;
3492 #ifdef ELF_FUNCTION_DESC
3493 /* If a function, already a function descriptor - we would
3494 have to copy it to add an offset. */
3495 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3496 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3500 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3503 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3506 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3507 (void*)P, (void*)S, (void*)A ));
3508 /* checkProddableBlock ( oc, (void*)P ); */
3512 switch (ELF_R_TYPE(info)) {
3513 # if defined(sparc_HOST_ARCH)
3514 case R_SPARC_WDISP30:
3515 w1 = *pP & 0xC0000000;
3516 w2 = (Elf_Word)((value - P) >> 2);
3517 ASSERT((w2 & 0xC0000000) == 0);
3522 w1 = *pP & 0xFFC00000;
3523 w2 = (Elf_Word)(value >> 10);
3524 ASSERT((w2 & 0xFFC00000) == 0);
3530 w2 = (Elf_Word)(value & 0x3FF);
3531 ASSERT((w2 & ~0x3FF) == 0);
3535 /* According to the Sun documentation:
3537 This relocation type resembles R_SPARC_32, except it refers to an
3538 unaligned word. That is, the word to be relocated must be treated
3539 as four separate bytes with arbitrary alignment, not as a word
3540 aligned according to the architecture requirements.
3542 (JRS: which means that freeloading on the R_SPARC_32 case
3543 is probably wrong, but hey ...)
3547 w2 = (Elf_Word)value;
3550 # elif defined(ia64_HOST_ARCH)
3551 case R_IA64_DIR64LSB:
3552 case R_IA64_FPTR64LSB:
3555 case R_IA64_PCREL64LSB:
3558 case R_IA64_SEGREL64LSB:
3559 addr = findElfSegment(ehdrC, value);
3562 case R_IA64_GPREL22:
3563 ia64_reloc_gprel22(P, value);
3565 case R_IA64_LTOFF22:
3566 case R_IA64_LTOFF22X:
3567 case R_IA64_LTOFF_FPTR22:
3568 addr = allocateGOTEntry(value);
3569 ia64_reloc_gprel22(P, addr);
3571 case R_IA64_PCREL21B:
3572 ia64_reloc_pcrel21(P, S, oc);
3575 /* This goes with R_IA64_LTOFF22X and points to the load to
3576 * convert into a move. We don't implement relaxation. */
3578 # elif defined(powerpc_HOST_ARCH)
3579 case R_PPC_ADDR16_LO:
3580 *(Elf32_Half*) P = value;
3583 case R_PPC_ADDR16_HI:
3584 *(Elf32_Half*) P = value >> 16;
3587 case R_PPC_ADDR16_HA:
3588 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3592 *(Elf32_Word *) P = value;
3596 *(Elf32_Word *) P = value - P;
3602 if( delta << 6 >> 6 != delta )
3604 value = (Elf_Addr) (&makeSymbolExtra( oc, ELF_R_SYM(info), value )
3608 if( value == 0 || delta << 6 >> 6 != delta )
3610 barf( "Unable to make SymbolExtra for #%d",
3616 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3617 | (delta & 0x3fffffc);
3621 #if x86_64_HOST_ARCH
3623 *(Elf64_Xword *)P = value;
3628 StgInt64 off = value - P;
3629 if (off >= 0x7fffffffL || off < -0x80000000L) {
3630 #if X86_64_ELF_NONPIC_HACK
3631 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3633 off = pltAddress + A - P;
3635 barf("R_X86_64_PC32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3636 symbol, off, oc->fileName );
3639 *(Elf64_Word *)P = (Elf64_Word)off;
3645 StgInt64 off = value - P;
3646 *(Elf64_Word *)P = (Elf64_Word)off;
3651 if (value >= 0x7fffffffL) {
3652 #if X86_64_ELF_NONPIC_HACK
3653 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3655 value = pltAddress + A;
3657 barf("R_X86_64_32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3658 symbol, value, oc->fileName );
3661 *(Elf64_Word *)P = (Elf64_Word)value;
3665 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3666 #if X86_64_ELF_NONPIC_HACK
3667 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3669 value = pltAddress + A;
3671 barf("R_X86_64_32S relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3672 symbol, value, oc->fileName );
3675 *(Elf64_Sword *)P = (Elf64_Sword)value;
3678 case R_X86_64_GOTPCREL:
3680 StgInt64 gotAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)->addr;
3681 StgInt64 off = gotAddress + A - P;
3682 *(Elf64_Word *)P = (Elf64_Word)off;
3686 case R_X86_64_PLT32:
3688 StgInt64 off = value - P;
3689 if (off >= 0x7fffffffL || off < -0x80000000L) {
3690 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3692 off = pltAddress + A - P;
3694 *(Elf64_Word *)P = (Elf64_Word)off;
3700 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3701 oc->fileName, (lnat)ELF_R_TYPE(info));
3710 ocResolve_ELF ( ObjectCode* oc )
3714 Elf_Sym* stab = NULL;
3715 char* ehdrC = (char*)(oc->image);
3716 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3717 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3719 /* first find "the" symbol table */
3720 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3722 /* also go find the string table */
3723 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3725 if (stab == NULL || strtab == NULL) {
3726 errorBelch("%s: can't find string or symbol table", oc->fileName);
3730 /* Process the relocation sections. */
3731 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3732 if (shdr[shnum].sh_type == SHT_REL) {
3733 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3734 shnum, stab, strtab );
3738 if (shdr[shnum].sh_type == SHT_RELA) {
3739 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3740 shnum, stab, strtab );
3745 #if defined(powerpc_HOST_ARCH)
3746 ocFlushInstructionCache( oc );
3754 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3755 * at the front. The following utility functions pack and unpack instructions, and
3756 * take care of the most common relocations.
3759 #ifdef ia64_HOST_ARCH
3762 ia64_extract_instruction(Elf64_Xword *target)
3765 int slot = (Elf_Addr)target & 3;
3766 target = (Elf_Addr)target & ~3;
3774 return ((w1 >> 5) & 0x1ffffffffff);
3776 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3780 barf("ia64_extract_instruction: invalid slot %p", target);
3785 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3787 int slot = (Elf_Addr)target & 3;
3788 target = (Elf_Addr)target & ~3;
3793 *target |= value << 5;
3796 *target |= value << 46;
3797 *(target+1) |= value >> 18;
3800 *(target+1) |= value << 23;
3806 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3808 Elf64_Xword instruction;
3809 Elf64_Sxword rel_value;
3811 rel_value = value - gp_val;
3812 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3813 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3815 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3816 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3817 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3818 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3819 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3820 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3824 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3826 Elf64_Xword instruction;
3827 Elf64_Sxword rel_value;
3830 entry = allocatePLTEntry(value, oc);
3832 rel_value = (entry >> 4) - (target >> 4);
3833 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3834 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3836 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3837 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3838 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3839 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3845 * PowerPC & X86_64 ELF specifics
3848 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3850 static int ocAllocateSymbolExtras_ELF( ObjectCode *oc )
3856 ehdr = (Elf_Ehdr *) oc->image;
3857 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3859 for( i = 0; i < ehdr->e_shnum; i++ )
3860 if( shdr[i].sh_type == SHT_SYMTAB )
3863 if( i == ehdr->e_shnum )
3865 errorBelch( "This ELF file contains no symtab" );
3869 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3871 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3872 (int) shdr[i].sh_entsize, (int) sizeof( Elf_Sym ) );
3877 return ocAllocateSymbolExtras( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3880 #endif /* powerpc */
3884 /* --------------------------------------------------------------------------
3886 * ------------------------------------------------------------------------*/
3888 #if defined(OBJFORMAT_MACHO)
3891 Support for MachO linking on Darwin/MacOS X
3892 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3894 I hereby formally apologize for the hackish nature of this code.
3895 Things that need to be done:
3896 *) implement ocVerifyImage_MachO
3897 *) add still more sanity checks.
3900 #if x86_64_HOST_ARCH || powerpc64_HOST_ARCH
3901 #define mach_header mach_header_64
3902 #define segment_command segment_command_64
3903 #define section section_64
3904 #define nlist nlist_64
3907 #ifdef powerpc_HOST_ARCH
3908 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3910 struct mach_header *header = (struct mach_header *) oc->image;
3911 struct load_command *lc = (struct load_command *) (header + 1);
3914 for( i = 0; i < header->ncmds; i++ )
3916 if( lc->cmd == LC_SYMTAB )
3918 // Find out the first and last undefined external
3919 // symbol, so we don't have to allocate too many
3921 struct symtab_command *symLC = (struct symtab_command *) lc;
3922 unsigned min = symLC->nsyms, max = 0;
3923 struct nlist *nlist =
3924 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3926 for(i=0;i<symLC->nsyms;i++)
3928 if(nlist[i].n_type & N_STAB)
3930 else if(nlist[i].n_type & N_EXT)
3932 if((nlist[i].n_type & N_TYPE) == N_UNDF
3933 && (nlist[i].n_value == 0))
3943 return ocAllocateSymbolExtras(oc, max - min + 1, min);
3948 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3950 return ocAllocateSymbolExtras(oc,0,0);
3953 #ifdef x86_64_HOST_ARCH
3954 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3956 struct mach_header *header = (struct mach_header *) oc->image;
3957 struct load_command *lc = (struct load_command *) (header + 1);
3960 for( i = 0; i < header->ncmds; i++ )
3962 if( lc->cmd == LC_SYMTAB )
3964 // Just allocate one entry for every symbol
3965 struct symtab_command *symLC = (struct symtab_command *) lc;
3967 return ocAllocateSymbolExtras(oc, symLC->nsyms, 0);
3970 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3972 return ocAllocateSymbolExtras(oc,0,0);
3976 static int ocVerifyImage_MachO(ObjectCode* oc)
3978 char *image = (char*) oc->image;
3979 struct mach_header *header = (struct mach_header*) image;
3981 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
3982 if(header->magic != MH_MAGIC_64)
3985 if(header->magic != MH_MAGIC)
3988 // FIXME: do some more verifying here
3992 static int resolveImports(
3995 struct symtab_command *symLC,
3996 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3997 unsigned long *indirectSyms,
3998 struct nlist *nlist)
4001 size_t itemSize = 4;
4004 int isJumpTable = 0;
4005 if(!strcmp(sect->sectname,"__jump_table"))
4009 ASSERT(sect->reserved2 == itemSize);
4013 for(i=0; i*itemSize < sect->size;i++)
4015 // according to otool, reserved1 contains the first index into the indirect symbol table
4016 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
4017 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4020 if((symbol->n_type & N_TYPE) == N_UNDF
4021 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
4022 addr = (void*) (symbol->n_value);
4024 addr = lookupSymbol(nm);
4027 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
4035 checkProddableBlock(oc,image + sect->offset + i*itemSize);
4036 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
4037 *(unsigned*)(image + sect->offset + i*itemSize + 1)
4038 = (char*)addr - (image + sect->offset + i*itemSize + 5);
4043 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
4044 ((void**)(image + sect->offset))[i] = addr;
4051 static unsigned long relocateAddress(
4054 struct section* sections,
4055 unsigned long address)
4058 for(i = 0; i < nSections; i++)
4060 if(sections[i].addr <= address
4061 && address < sections[i].addr + sections[i].size)
4063 return (unsigned long)oc->image
4064 + sections[i].offset + address - sections[i].addr;
4067 barf("Invalid Mach-O file:"
4068 "Address out of bounds while relocating object file");
4072 static int relocateSection(
4075 struct symtab_command *symLC, struct nlist *nlist,
4076 int nSections, struct section* sections, struct section *sect)
4078 struct relocation_info *relocs;
4081 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
4083 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
4085 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
4087 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
4091 relocs = (struct relocation_info*) (image + sect->reloff);
4095 #ifdef x86_64_HOST_ARCH
4096 struct relocation_info *reloc = &relocs[i];
4098 char *thingPtr = image + sect->offset + reloc->r_address;
4102 int type = reloc->r_type;
4104 checkProddableBlock(oc,thingPtr);
4105 switch(reloc->r_length)
4108 thing = *(uint8_t*)thingPtr;
4109 baseValue = (uint64_t)thingPtr + 1;
4112 thing = *(uint16_t*)thingPtr;
4113 baseValue = (uint64_t)thingPtr + 2;
4116 thing = *(uint32_t*)thingPtr;
4117 baseValue = (uint64_t)thingPtr + 4;
4120 thing = *(uint64_t*)thingPtr;
4121 baseValue = (uint64_t)thingPtr + 8;
4124 barf("Unknown size.");
4127 if(type == X86_64_RELOC_GOT
4128 || type == X86_64_RELOC_GOT_LOAD)
4130 ASSERT(reloc->r_extern);
4131 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)->addr;
4133 type = X86_64_RELOC_SIGNED;
4135 else if(reloc->r_extern)
4137 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4138 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4139 if(symbol->n_value == 0)
4140 value = (uint64_t) lookupSymbol(nm);
4142 value = relocateAddress(oc, nSections, sections,
4147 value = sections[reloc->r_symbolnum-1].offset
4148 - sections[reloc->r_symbolnum-1].addr
4152 if(type == X86_64_RELOC_BRANCH)
4154 if((int32_t)(value - baseValue) != (int64_t)(value - baseValue))
4156 ASSERT(reloc->r_extern);
4157 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)
4160 ASSERT((int32_t)(value - baseValue) == (int64_t)(value - baseValue));
4161 type = X86_64_RELOC_SIGNED;
4166 case X86_64_RELOC_UNSIGNED:
4167 ASSERT(!reloc->r_pcrel);
4170 case X86_64_RELOC_SIGNED:
4171 ASSERT(reloc->r_pcrel);
4172 thing += value - baseValue;
4174 case X86_64_RELOC_SUBTRACTOR:
4175 ASSERT(!reloc->r_pcrel);
4179 barf("unkown relocation");
4182 switch(reloc->r_length)
4185 *(uint8_t*)thingPtr = thing;
4188 *(uint16_t*)thingPtr = thing;
4191 *(uint32_t*)thingPtr = thing;
4194 *(uint64_t*)thingPtr = thing;
4198 if(relocs[i].r_address & R_SCATTERED)
4200 struct scattered_relocation_info *scat =
4201 (struct scattered_relocation_info*) &relocs[i];
4205 if(scat->r_length == 2)
4207 unsigned long word = 0;
4208 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
4209 checkProddableBlock(oc,wordPtr);
4211 // Note on relocation types:
4212 // i386 uses the GENERIC_RELOC_* types,
4213 // while ppc uses special PPC_RELOC_* types.
4214 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
4215 // in both cases, all others are different.
4216 // Therefore, we use GENERIC_RELOC_VANILLA
4217 // and GENERIC_RELOC_PAIR instead of the PPC variants,
4218 // and use #ifdefs for the other types.
4220 // Step 1: Figure out what the relocated value should be
4221 if(scat->r_type == GENERIC_RELOC_VANILLA)
4223 word = *wordPtr + (unsigned long) relocateAddress(
4230 #ifdef powerpc_HOST_ARCH
4231 else if(scat->r_type == PPC_RELOC_SECTDIFF
4232 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
4233 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
4234 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
4236 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
4239 struct scattered_relocation_info *pair =
4240 (struct scattered_relocation_info*) &relocs[i+1];
4242 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
4243 barf("Invalid Mach-O file: "
4244 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
4246 word = (unsigned long)
4247 (relocateAddress(oc, nSections, sections, scat->r_value)
4248 - relocateAddress(oc, nSections, sections, pair->r_value));
4251 #ifdef powerpc_HOST_ARCH
4252 else if(scat->r_type == PPC_RELOC_HI16
4253 || scat->r_type == PPC_RELOC_LO16
4254 || scat->r_type == PPC_RELOC_HA16
4255 || scat->r_type == PPC_RELOC_LO14)
4256 { // these are generated by label+offset things
4257 struct relocation_info *pair = &relocs[i+1];
4258 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
4259 barf("Invalid Mach-O file: "
4260 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
4262 if(scat->r_type == PPC_RELOC_LO16)
4264 word = ((unsigned short*) wordPtr)[1];
4265 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4267 else if(scat->r_type == PPC_RELOC_LO14)
4269 barf("Unsupported Relocation: PPC_RELOC_LO14");
4270 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
4271 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4273 else if(scat->r_type == PPC_RELOC_HI16)
4275 word = ((unsigned short*) wordPtr)[1] << 16;
4276 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4278 else if(scat->r_type == PPC_RELOC_HA16)
4280 word = ((unsigned short*) wordPtr)[1] << 16;
4281 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4285 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4292 continue; // ignore the others
4294 #ifdef powerpc_HOST_ARCH
4295 if(scat->r_type == GENERIC_RELOC_VANILLA
4296 || scat->r_type == PPC_RELOC_SECTDIFF)
4298 if(scat->r_type == GENERIC_RELOC_VANILLA
4299 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4304 #ifdef powerpc_HOST_ARCH
4305 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4307 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4309 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4311 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4313 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4315 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4316 + ((word & (1<<15)) ? 1 : 0);
4322 continue; // FIXME: I hope it's OK to ignore all the others.
4326 struct relocation_info *reloc = &relocs[i];
4327 if(reloc->r_pcrel && !reloc->r_extern)
4330 if(reloc->r_length == 2)
4332 unsigned long word = 0;
4333 #ifdef powerpc_HOST_ARCH
4334 unsigned long jumpIsland = 0;
4335 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4336 // to avoid warning and to catch
4340 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4341 checkProddableBlock(oc,wordPtr);
4343 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4347 #ifdef powerpc_HOST_ARCH
4348 else if(reloc->r_type == PPC_RELOC_LO16)
4350 word = ((unsigned short*) wordPtr)[1];
4351 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4353 else if(reloc->r_type == PPC_RELOC_HI16)
4355 word = ((unsigned short*) wordPtr)[1] << 16;
4356 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4358 else if(reloc->r_type == PPC_RELOC_HA16)
4360 word = ((unsigned short*) wordPtr)[1] << 16;
4361 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4363 else if(reloc->r_type == PPC_RELOC_BR24)
4366 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4370 if(!reloc->r_extern)
4373 sections[reloc->r_symbolnum-1].offset
4374 - sections[reloc->r_symbolnum-1].addr
4381 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4382 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4383 void *symbolAddress = lookupSymbol(nm);
4386 errorBelch("\nunknown symbol `%s'", nm);
4392 #ifdef powerpc_HOST_ARCH
4393 // In the .o file, this should be a relative jump to NULL
4394 // and we'll change it to a relative jump to the symbol
4395 ASSERT(word + reloc->r_address == 0);
4396 jumpIsland = (unsigned long)
4397 &makeSymbolExtra(oc,
4399 (unsigned long) symbolAddress)
4403 offsetToJumpIsland = word + jumpIsland
4404 - (((long)image) + sect->offset - sect->addr);
4407 word += (unsigned long) symbolAddress
4408 - (((long)image) + sect->offset - sect->addr);
4412 word += (unsigned long) symbolAddress;
4416 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4421 #ifdef powerpc_HOST_ARCH
4422 else if(reloc->r_type == PPC_RELOC_LO16)
4424 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4427 else if(reloc->r_type == PPC_RELOC_HI16)
4429 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4432 else if(reloc->r_type == PPC_RELOC_HA16)
4434 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4435 + ((word & (1<<15)) ? 1 : 0);
4438 else if(reloc->r_type == PPC_RELOC_BR24)
4440 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4442 // The branch offset is too large.
4443 // Therefore, we try to use a jump island.
4446 barf("unconditional relative branch out of range: "
4447 "no jump island available");
4450 word = offsetToJumpIsland;
4451 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4452 barf("unconditional relative branch out of range: "
4453 "jump island out of range");
4455 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4460 barf("\nunknown relocation %d",reloc->r_type);
4468 static int ocGetNames_MachO(ObjectCode* oc)
4470 char *image = (char*) oc->image;
4471 struct mach_header *header = (struct mach_header*) image;
4472 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4473 unsigned i,curSymbol = 0;
4474 struct segment_command *segLC = NULL;
4475 struct section *sections;
4476 struct symtab_command *symLC = NULL;
4477 struct nlist *nlist;
4478 unsigned long commonSize = 0;
4479 char *commonStorage = NULL;
4480 unsigned long commonCounter;
4482 for(i=0;i<header->ncmds;i++)
4484 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4485 segLC = (struct segment_command*) lc;
4486 else if(lc->cmd == LC_SYMTAB)
4487 symLC = (struct symtab_command*) lc;
4488 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4491 sections = (struct section*) (segLC+1);
4492 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4496 barf("ocGetNames_MachO: no segment load command");
4498 for(i=0;i<segLC->nsects;i++)
4500 if(sections[i].size == 0)
4503 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4505 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4506 "ocGetNames_MachO(common symbols)");
4507 sections[i].offset = zeroFillArea - image;
4510 if(!strcmp(sections[i].sectname,"__text"))
4511 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4512 (void*) (image + sections[i].offset),
4513 (void*) (image + sections[i].offset + sections[i].size));
4514 else if(!strcmp(sections[i].sectname,"__const"))
4515 addSection(oc, SECTIONKIND_RWDATA,
4516 (void*) (image + sections[i].offset),
4517 (void*) (image + sections[i].offset + sections[i].size));
4518 else if(!strcmp(sections[i].sectname,"__data"))
4519 addSection(oc, SECTIONKIND_RWDATA,
4520 (void*) (image + sections[i].offset),
4521 (void*) (image + sections[i].offset + sections[i].size));
4522 else if(!strcmp(sections[i].sectname,"__bss")
4523 || !strcmp(sections[i].sectname,"__common"))
4524 addSection(oc, SECTIONKIND_RWDATA,
4525 (void*) (image + sections[i].offset),
4526 (void*) (image + sections[i].offset + sections[i].size));
4528 addProddableBlock(oc, (void*) (image + sections[i].offset),
4532 // count external symbols defined here
4536 for(i=0;i<symLC->nsyms;i++)
4538 if(nlist[i].n_type & N_STAB)
4540 else if(nlist[i].n_type & N_EXT)
4542 if((nlist[i].n_type & N_TYPE) == N_UNDF
4543 && (nlist[i].n_value != 0))
4545 commonSize += nlist[i].n_value;
4548 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4553 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4554 "ocGetNames_MachO(oc->symbols)");
4558 for(i=0;i<symLC->nsyms;i++)
4560 if(nlist[i].n_type & N_STAB)
4562 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4564 if(nlist[i].n_type & N_EXT)
4566 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4567 if((nlist[i].n_desc & N_WEAK_DEF) && lookupSymbol(nm))
4568 ; // weak definition, and we already have a definition
4571 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4573 + sections[nlist[i].n_sect-1].offset
4574 - sections[nlist[i].n_sect-1].addr
4575 + nlist[i].n_value);
4576 oc->symbols[curSymbol++] = nm;
4583 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4584 commonCounter = (unsigned long)commonStorage;
4587 for(i=0;i<symLC->nsyms;i++)
4589 if((nlist[i].n_type & N_TYPE) == N_UNDF
4590 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4592 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4593 unsigned long sz = nlist[i].n_value;
4595 nlist[i].n_value = commonCounter;
4597 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4598 (void*)commonCounter);
4599 oc->symbols[curSymbol++] = nm;
4601 commonCounter += sz;
4608 static int ocResolve_MachO(ObjectCode* oc)
4610 char *image = (char*) oc->image;
4611 struct mach_header *header = (struct mach_header*) image;
4612 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4614 struct segment_command *segLC = NULL;
4615 struct section *sections;
4616 struct symtab_command *symLC = NULL;
4617 struct dysymtab_command *dsymLC = NULL;
4618 struct nlist *nlist;
4620 for(i=0;i<header->ncmds;i++)
4622 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4623 segLC = (struct segment_command*) lc;
4624 else if(lc->cmd == LC_SYMTAB)
4625 symLC = (struct symtab_command*) lc;
4626 else if(lc->cmd == LC_DYSYMTAB)
4627 dsymLC = (struct dysymtab_command*) lc;
4628 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4631 sections = (struct section*) (segLC+1);
4632 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4637 unsigned long *indirectSyms
4638 = (unsigned long*) (image + dsymLC->indirectsymoff);
4640 for(i=0;i<segLC->nsects;i++)
4642 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4643 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4644 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4646 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4649 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4650 || !strcmp(sections[i].sectname,"__pointers"))
4652 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4655 else if(!strcmp(sections[i].sectname,"__jump_table"))
4657 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4663 for(i=0;i<segLC->nsects;i++)
4665 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4669 #if defined (powerpc_HOST_ARCH)
4670 ocFlushInstructionCache( oc );
4676 #ifdef powerpc_HOST_ARCH
4678 * The Mach-O object format uses leading underscores. But not everywhere.
4679 * There is a small number of runtime support functions defined in
4680 * libcc_dynamic.a whose name does not have a leading underscore.
4681 * As a consequence, we can't get their address from C code.
4682 * We have to use inline assembler just to take the address of a function.
4686 static void machoInitSymbolsWithoutUnderscore()
4688 extern void* symbolsWithoutUnderscore[];
4689 void **p = symbolsWithoutUnderscore;
4690 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4692 #undef SymI_NeedsProto
4693 #define SymI_NeedsProto(x) \
4694 __asm__ volatile(".long " # x);
4696 RTS_MACHO_NOUNDERLINE_SYMBOLS
4698 __asm__ volatile(".text");
4700 #undef SymI_NeedsProto
4701 #define SymI_NeedsProto(x) \
4702 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4704 RTS_MACHO_NOUNDERLINE_SYMBOLS
4706 #undef SymI_NeedsProto
4711 * Figure out by how much to shift the entire Mach-O file in memory
4712 * when loading so that its single segment ends up 16-byte-aligned
4714 static int machoGetMisalignment( FILE * f )
4716 struct mach_header header;
4719 fread(&header, sizeof(header), 1, f);
4722 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
4723 if(header.magic != MH_MAGIC_64)
4726 if(header.magic != MH_MAGIC)
4730 misalignment = (header.sizeofcmds + sizeof(header))
4733 return misalignment ? (16 - misalignment) : 0;