1 /* -----------------------------------------------------------------------------
3 * (c) The GHC Team, 2000-2004
7 * ---------------------------------------------------------------------------*/
10 #include "PosixSource.h"
13 /* Linux needs _GNU_SOURCE to get RTLD_DEFAULT from <dlfcn.h> and
14 MREMAP_MAYMOVE from <sys/mman.h>.
25 #include "LinkerInternals.h"
29 #include "RtsGlobals.h"
33 #ifdef HAVE_SYS_TYPES_H
34 #include <sys/types.h>
40 #ifdef HAVE_SYS_STAT_H
44 #if defined(HAVE_DLFCN_H)
48 #if defined(cygwin32_HOST_OS)
53 #ifdef HAVE_SYS_TIME_H
57 #include <sys/fcntl.h>
58 #include <sys/termios.h>
59 #include <sys/utime.h>
60 #include <sys/utsname.h>
64 #if defined(ia64_HOST_ARCH) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
69 #if defined(linux_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
77 #if defined(linux_HOST_OS) || defined(solaris2_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
78 # define OBJFORMAT_ELF
79 #elif defined(cygwin32_HOST_OS) || defined (mingw32_HOST_OS)
80 # define OBJFORMAT_PEi386
83 #elif defined(darwin_HOST_OS)
84 # define OBJFORMAT_MACHO
85 # include <mach-o/loader.h>
86 # include <mach-o/nlist.h>
87 # include <mach-o/reloc.h>
88 #if !defined(HAVE_DLFCN_H)
89 # include <mach-o/dyld.h>
91 #if defined(powerpc_HOST_ARCH)
92 # include <mach-o/ppc/reloc.h>
94 #if defined(x86_64_HOST_ARCH)
95 # include <mach-o/x86_64/reloc.h>
99 /* Hash table mapping symbol names to Symbol */
100 static /*Str*/HashTable *symhash;
102 /* Hash table mapping symbol names to StgStablePtr */
103 static /*Str*/HashTable *stablehash;
105 /* List of currently loaded objects */
106 ObjectCode *objects = NULL; /* initially empty */
108 #if defined(OBJFORMAT_ELF)
109 static int ocVerifyImage_ELF ( ObjectCode* oc );
110 static int ocGetNames_ELF ( ObjectCode* oc );
111 static int ocResolve_ELF ( ObjectCode* oc );
112 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
113 static int ocAllocateSymbolExtras_ELF ( ObjectCode* oc );
115 #elif defined(OBJFORMAT_PEi386)
116 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
117 static int ocGetNames_PEi386 ( ObjectCode* oc );
118 static int ocResolve_PEi386 ( ObjectCode* oc );
119 static void *lookupSymbolInDLLs ( unsigned char *lbl );
120 static void zapTrailingAtSign ( unsigned char *sym );
121 #elif defined(OBJFORMAT_MACHO)
122 static int ocVerifyImage_MachO ( ObjectCode* oc );
123 static int ocGetNames_MachO ( ObjectCode* oc );
124 static int ocResolve_MachO ( ObjectCode* oc );
126 static int machoGetMisalignment( FILE * );
127 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
128 static int ocAllocateSymbolExtras_MachO ( ObjectCode* oc );
130 #ifdef powerpc_HOST_ARCH
131 static void machoInitSymbolsWithoutUnderscore( void );
135 /* on x86_64 we have a problem with relocating symbol references in
136 * code that was compiled without -fPIC. By default, the small memory
137 * model is used, which assumes that symbol references can fit in a
138 * 32-bit slot. The system dynamic linker makes this work for
139 * references to shared libraries by either (a) allocating a jump
140 * table slot for code references, or (b) moving the symbol at load
141 * time (and copying its contents, if necessary) for data references.
143 * We unfortunately can't tell whether symbol references are to code
144 * or data. So for now we assume they are code (the vast majority
145 * are), and allocate jump-table slots. Unfortunately this will
146 * SILENTLY generate crashing code for data references. This hack is
147 * enabled by X86_64_ELF_NONPIC_HACK.
149 * One workaround is to use shared Haskell libraries. This is
150 * coming. Another workaround is to keep the static libraries but
151 * compile them with -fPIC, because that will generate PIC references
152 * to data which can be relocated. The PIC code is still too green to
153 * do this systematically, though.
156 * See thread http://www.haskell.org/pipermail/cvs-ghc/2007-September/038458.html
158 * Naming Scheme for Symbol Macros
160 * SymI_*: symbol is internal to the RTS. It resides in an object
161 * file/library that is statically.
162 * SymE_*: symbol is external to the RTS library. It might be linked
165 * Sym*_HasProto : the symbol prototype is imported in an include file
166 * or defined explicitly
167 * Sym*_NeedsProto: the symbol is undefined and we add a dummy
168 * default proto extern void sym(void);
170 #define X86_64_ELF_NONPIC_HACK 1
172 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
173 * small memory model on this architecture (see gcc docs,
176 * MAP_32BIT not available on OpenBSD/amd64
178 #if defined(x86_64_HOST_ARCH) && defined(MAP_32BIT)
179 #define TRY_MAP_32BIT MAP_32BIT
181 #define TRY_MAP_32BIT 0
185 * Due to the small memory model (see above), on x86_64 we have to map
186 * all our non-PIC object files into the low 2Gb of the address space
187 * (why 2Gb and not 4Gb? Because all addresses must be reachable
188 * using a 32-bit signed PC-relative offset). On Linux we can do this
189 * using the MAP_32BIT flag to mmap(), however on other OSs
190 * (e.g. *BSD, see #2063, and also on Linux inside Xen, see #2512), we
191 * can't do this. So on these systems, we have to pick a base address
192 * in the low 2Gb of the address space and try to allocate memory from
195 * We pick a default address based on the OS, but also make this
196 * configurable via an RTS flag (+RTS -xm)
198 #if defined(x86_64_HOST_ARCH)
200 #if defined(MAP_32BIT)
201 // Try to use MAP_32BIT
202 #define MMAP_32BIT_BASE_DEFAULT 0
205 #define MMAP_32BIT_BASE_DEFAULT 0x40000000
208 static void *mmap_32bit_base = 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(getOrSetSignalHandlerStore) \
643 SymI_HasProto(gcdIntegerzh_fast) \
644 SymI_HasProto(gcdIntegerIntzh_fast) \
645 SymI_HasProto(gcdIntzh_fast) \
646 SymI_HasProto(genSymZh) \
647 SymI_HasProto(genericRaise) \
648 SymI_HasProto(getProgArgv) \
649 SymI_HasProto(getFullProgArgv) \
650 SymI_HasProto(getStablePtr) \
651 SymI_HasProto(hs_init) \
652 SymI_HasProto(hs_exit) \
653 SymI_HasProto(hs_set_argv) \
654 SymI_HasProto(hs_add_root) \
655 SymI_HasProto(hs_perform_gc) \
656 SymI_HasProto(hs_free_stable_ptr) \
657 SymI_HasProto(hs_free_fun_ptr) \
658 SymI_HasProto(hs_hpc_rootModule) \
659 SymI_HasProto(hs_hpc_module) \
660 SymI_HasProto(initLinker) \
661 SymI_HasProto(unpackClosurezh_fast) \
662 SymI_HasProto(getApStackValzh_fast) \
663 SymI_HasProto(getSparkzh_fast) \
664 SymI_HasProto(int2Integerzh_fast) \
665 SymI_HasProto(integer2Intzh_fast) \
666 SymI_HasProto(integer2Wordzh_fast) \
667 SymI_HasProto(isCurrentThreadBoundzh_fast) \
668 SymI_HasProto(isDoubleDenormalized) \
669 SymI_HasProto(isDoubleInfinite) \
670 SymI_HasProto(isDoubleNaN) \
671 SymI_HasProto(isDoubleNegativeZero) \
672 SymI_HasProto(isEmptyMVarzh_fast) \
673 SymI_HasProto(isFloatDenormalized) \
674 SymI_HasProto(isFloatInfinite) \
675 SymI_HasProto(isFloatNaN) \
676 SymI_HasProto(isFloatNegativeZero) \
677 SymI_HasProto(killThreadzh_fast) \
678 SymI_HasProto(loadObj) \
679 SymI_HasProto(insertStableSymbol) \
680 SymI_HasProto(insertSymbol) \
681 SymI_HasProto(lookupSymbol) \
682 SymI_HasProto(makeStablePtrzh_fast) \
683 SymI_HasProto(minusIntegerzh_fast) \
684 SymI_HasProto(mkApUpd0zh_fast) \
685 SymI_HasProto(myThreadIdzh_fast) \
686 SymI_HasProto(labelThreadzh_fast) \
687 SymI_HasProto(newArrayzh_fast) \
688 SymI_HasProto(newBCOzh_fast) \
689 SymI_HasProto(newByteArrayzh_fast) \
690 SymI_HasProto_redirect(newCAF, newDynCAF) \
691 SymI_HasProto(newMVarzh_fast) \
692 SymI_HasProto(newMutVarzh_fast) \
693 SymI_HasProto(newTVarzh_fast) \
694 SymI_HasProto(noDuplicatezh_fast) \
695 SymI_HasProto(atomicModifyMutVarzh_fast) \
696 SymI_HasProto(newPinnedByteArrayzh_fast) \
697 SymI_HasProto(newAlignedPinnedByteArrayzh_fast) \
698 SymI_HasProto(newSpark) \
699 SymI_HasProto(orIntegerzh_fast) \
700 SymI_HasProto(performGC) \
701 SymI_HasProto(performMajorGC) \
702 SymI_HasProto(plusIntegerzh_fast) \
703 SymI_HasProto(prog_argc) \
704 SymI_HasProto(prog_argv) \
705 SymI_HasProto(putMVarzh_fast) \
706 SymI_HasProto(quotIntegerzh_fast) \
707 SymI_HasProto(quotRemIntegerzh_fast) \
708 SymI_HasProto(raisezh_fast) \
709 SymI_HasProto(raiseIOzh_fast) \
710 SymI_HasProto(readTVarzh_fast) \
711 SymI_HasProto(readTVarIOzh_fast) \
712 SymI_HasProto(remIntegerzh_fast) \
713 SymI_HasProto(resetNonBlockingFd) \
714 SymI_HasProto(resumeThread) \
715 SymI_HasProto(resolveObjs) \
716 SymI_HasProto(retryzh_fast) \
717 SymI_HasProto(rts_apply) \
718 SymI_HasProto(rts_checkSchedStatus) \
719 SymI_HasProto(rts_eval) \
720 SymI_HasProto(rts_evalIO) \
721 SymI_HasProto(rts_evalLazyIO) \
722 SymI_HasProto(rts_evalStableIO) \
723 SymI_HasProto(rts_eval_) \
724 SymI_HasProto(rts_getBool) \
725 SymI_HasProto(rts_getChar) \
726 SymI_HasProto(rts_getDouble) \
727 SymI_HasProto(rts_getFloat) \
728 SymI_HasProto(rts_getInt) \
729 SymI_HasProto(rts_getInt8) \
730 SymI_HasProto(rts_getInt16) \
731 SymI_HasProto(rts_getInt32) \
732 SymI_HasProto(rts_getInt64) \
733 SymI_HasProto(rts_getPtr) \
734 SymI_HasProto(rts_getFunPtr) \
735 SymI_HasProto(rts_getStablePtr) \
736 SymI_HasProto(rts_getThreadId) \
737 SymI_HasProto(rts_getWord) \
738 SymI_HasProto(rts_getWord8) \
739 SymI_HasProto(rts_getWord16) \
740 SymI_HasProto(rts_getWord32) \
741 SymI_HasProto(rts_getWord64) \
742 SymI_HasProto(rts_lock) \
743 SymI_HasProto(rts_mkBool) \
744 SymI_HasProto(rts_mkChar) \
745 SymI_HasProto(rts_mkDouble) \
746 SymI_HasProto(rts_mkFloat) \
747 SymI_HasProto(rts_mkInt) \
748 SymI_HasProto(rts_mkInt8) \
749 SymI_HasProto(rts_mkInt16) \
750 SymI_HasProto(rts_mkInt32) \
751 SymI_HasProto(rts_mkInt64) \
752 SymI_HasProto(rts_mkPtr) \
753 SymI_HasProto(rts_mkFunPtr) \
754 SymI_HasProto(rts_mkStablePtr) \
755 SymI_HasProto(rts_mkString) \
756 SymI_HasProto(rts_mkWord) \
757 SymI_HasProto(rts_mkWord8) \
758 SymI_HasProto(rts_mkWord16) \
759 SymI_HasProto(rts_mkWord32) \
760 SymI_HasProto(rts_mkWord64) \
761 SymI_HasProto(rts_unlock) \
762 SymI_HasProto(rtsSupportsBoundThreads) \
763 SymI_HasProto(__hscore_get_saved_termios) \
764 SymI_HasProto(__hscore_set_saved_termios) \
765 SymI_HasProto(setProgArgv) \
766 SymI_HasProto(startupHaskell) \
767 SymI_HasProto(shutdownHaskell) \
768 SymI_HasProto(shutdownHaskellAndExit) \
769 SymI_HasProto(stable_ptr_table) \
770 SymI_HasProto(stackOverflow) \
771 SymI_HasProto(stg_CAF_BLACKHOLE_info) \
772 SymI_HasProto(__stg_EAGER_BLACKHOLE_info) \
773 SymI_HasProto(awakenBlockedQueue) \
774 SymI_HasProto(startTimer) \
775 SymI_HasProto(stg_CHARLIKE_closure) \
776 SymI_HasProto(stg_MVAR_CLEAN_info) \
777 SymI_HasProto(stg_MVAR_DIRTY_info) \
778 SymI_HasProto(stg_IND_STATIC_info) \
779 SymI_HasProto(stg_INTLIKE_closure) \
780 SymI_HasProto(stg_MUT_ARR_PTRS_DIRTY_info) \
781 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN_info) \
782 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN0_info) \
783 SymI_HasProto(stg_WEAK_info) \
784 SymI_HasProto(stg_ap_v_info) \
785 SymI_HasProto(stg_ap_f_info) \
786 SymI_HasProto(stg_ap_d_info) \
787 SymI_HasProto(stg_ap_l_info) \
788 SymI_HasProto(stg_ap_n_info) \
789 SymI_HasProto(stg_ap_p_info) \
790 SymI_HasProto(stg_ap_pv_info) \
791 SymI_HasProto(stg_ap_pp_info) \
792 SymI_HasProto(stg_ap_ppv_info) \
793 SymI_HasProto(stg_ap_ppp_info) \
794 SymI_HasProto(stg_ap_pppv_info) \
795 SymI_HasProto(stg_ap_pppp_info) \
796 SymI_HasProto(stg_ap_ppppp_info) \
797 SymI_HasProto(stg_ap_pppppp_info) \
798 SymI_HasProto(stg_ap_0_fast) \
799 SymI_HasProto(stg_ap_v_fast) \
800 SymI_HasProto(stg_ap_f_fast) \
801 SymI_HasProto(stg_ap_d_fast) \
802 SymI_HasProto(stg_ap_l_fast) \
803 SymI_HasProto(stg_ap_n_fast) \
804 SymI_HasProto(stg_ap_p_fast) \
805 SymI_HasProto(stg_ap_pv_fast) \
806 SymI_HasProto(stg_ap_pp_fast) \
807 SymI_HasProto(stg_ap_ppv_fast) \
808 SymI_HasProto(stg_ap_ppp_fast) \
809 SymI_HasProto(stg_ap_pppv_fast) \
810 SymI_HasProto(stg_ap_pppp_fast) \
811 SymI_HasProto(stg_ap_ppppp_fast) \
812 SymI_HasProto(stg_ap_pppppp_fast) \
813 SymI_HasProto(stg_ap_1_upd_info) \
814 SymI_HasProto(stg_ap_2_upd_info) \
815 SymI_HasProto(stg_ap_3_upd_info) \
816 SymI_HasProto(stg_ap_4_upd_info) \
817 SymI_HasProto(stg_ap_5_upd_info) \
818 SymI_HasProto(stg_ap_6_upd_info) \
819 SymI_HasProto(stg_ap_7_upd_info) \
820 SymI_HasProto(stg_exit) \
821 SymI_HasProto(stg_sel_0_upd_info) \
822 SymI_HasProto(stg_sel_10_upd_info) \
823 SymI_HasProto(stg_sel_11_upd_info) \
824 SymI_HasProto(stg_sel_12_upd_info) \
825 SymI_HasProto(stg_sel_13_upd_info) \
826 SymI_HasProto(stg_sel_14_upd_info) \
827 SymI_HasProto(stg_sel_15_upd_info) \
828 SymI_HasProto(stg_sel_1_upd_info) \
829 SymI_HasProto(stg_sel_2_upd_info) \
830 SymI_HasProto(stg_sel_3_upd_info) \
831 SymI_HasProto(stg_sel_4_upd_info) \
832 SymI_HasProto(stg_sel_5_upd_info) \
833 SymI_HasProto(stg_sel_6_upd_info) \
834 SymI_HasProto(stg_sel_7_upd_info) \
835 SymI_HasProto(stg_sel_8_upd_info) \
836 SymI_HasProto(stg_sel_9_upd_info) \
837 SymI_HasProto(stg_upd_frame_info) \
838 SymI_HasProto(suspendThread) \
839 SymI_HasProto(takeMVarzh_fast) \
840 SymI_HasProto(threadStatuszh_fast) \
841 SymI_HasProto(timesIntegerzh_fast) \
842 SymI_HasProto(tryPutMVarzh_fast) \
843 SymI_HasProto(tryTakeMVarzh_fast) \
844 SymI_HasProto(unblockAsyncExceptionszh_fast) \
845 SymI_HasProto(unloadObj) \
846 SymI_HasProto(unsafeThawArrayzh_fast) \
847 SymI_HasProto(waitReadzh_fast) \
848 SymI_HasProto(waitWritezh_fast) \
849 SymI_HasProto(word2Integerzh_fast) \
850 SymI_HasProto(writeTVarzh_fast) \
851 SymI_HasProto(xorIntegerzh_fast) \
852 SymI_HasProto(yieldzh_fast) \
853 SymI_NeedsProto(stg_interp_constr_entry) \
854 SymI_HasProto(allocateExec) \
855 SymI_HasProto(freeExec) \
856 SymI_HasProto(getAllocations) \
857 SymI_HasProto(revertCAFs) \
858 SymI_HasProto(RtsFlags) \
859 SymI_NeedsProto(rts_breakpoint_io_action) \
860 SymI_NeedsProto(rts_stop_next_breakpoint) \
861 SymI_NeedsProto(rts_stop_on_exception) \
862 SymI_HasProto(stopTimer) \
863 SymI_HasProto(n_capabilities) \
864 SymI_HasProto(traceCcszh_fast) \
865 RTS_USER_SIGNALS_SYMBOLS
867 #ifdef SUPPORT_LONG_LONGS
868 #define RTS_LONG_LONG_SYMS \
869 SymI_HasProto(int64ToIntegerzh_fast) \
870 SymI_HasProto(word64ToIntegerzh_fast)
872 #define RTS_LONG_LONG_SYMS /* nothing */
875 // 64-bit support functions in libgcc.a
876 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
877 #define RTS_LIBGCC_SYMBOLS \
878 SymI_NeedsProto(__divdi3) \
879 SymI_NeedsProto(__udivdi3) \
880 SymI_NeedsProto(__moddi3) \
881 SymI_NeedsProto(__umoddi3) \
882 SymI_NeedsProto(__muldi3) \
883 SymI_NeedsProto(__ashldi3) \
884 SymI_NeedsProto(__ashrdi3) \
885 SymI_NeedsProto(__lshrdi3) \
886 SymI_NeedsProto(__eprintf)
887 #elif defined(ia64_HOST_ARCH)
888 #define RTS_LIBGCC_SYMBOLS \
889 SymI_NeedsProto(__divdi3) \
890 SymI_NeedsProto(__udivdi3) \
891 SymI_NeedsProto(__moddi3) \
892 SymI_NeedsProto(__umoddi3) \
893 SymI_NeedsProto(__divsf3) \
894 SymI_NeedsProto(__divdf3)
896 #define RTS_LIBGCC_SYMBOLS
899 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
900 // Symbols that don't have a leading underscore
901 // on Mac OS X. They have to receive special treatment,
902 // see machoInitSymbolsWithoutUnderscore()
903 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
904 SymI_NeedsProto(saveFP) \
905 SymI_NeedsProto(restFP)
908 /* entirely bogus claims about types of these symbols */
909 #define SymI_NeedsProto(vvv) extern void vvv(void);
910 #if defined(__PIC__) && defined(mingw32_TARGET_OS)
911 #define SymE_HasProto(vvv) SymE_HasProto(vvv);
912 #define SymE_NeedsProto(vvv) extern void _imp__ ## vvv (void);
914 #define SymE_NeedsProto(vvv) SymI_NeedsProto(vvv);
915 #define SymE_HasProto(vvv) SymI_HasProto(vvv)
917 #define SymI_HasProto(vvv) /**/
918 #define SymI_HasProto_redirect(vvv,xxx) /**/
922 RTS_POSIX_ONLY_SYMBOLS
923 RTS_MINGW_ONLY_SYMBOLS
924 RTS_CYGWIN_ONLY_SYMBOLS
925 RTS_DARWIN_ONLY_SYMBOLS
928 #undef SymI_NeedsProto
930 #undef SymI_HasProto_redirect
932 #undef SymE_NeedsProto
934 #ifdef LEADING_UNDERSCORE
935 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
937 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
940 #define SymI_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
942 #define SymE_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
943 (void*)DLL_IMPORT_DATA_REF(vvv) },
945 #define SymI_NeedsProto(vvv) SymI_HasProto(vvv)
946 #define SymE_NeedsProto(vvv) SymE_HasProto(vvv)
948 // SymI_HasProto_redirect allows us to redirect references to one symbol to
949 // another symbol. See newCAF/newDynCAF for an example.
950 #define SymI_HasProto_redirect(vvv,xxx) \
951 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
954 static RtsSymbolVal rtsSyms[] = {
958 RTS_POSIX_ONLY_SYMBOLS
959 RTS_MINGW_ONLY_SYMBOLS
960 RTS_CYGWIN_ONLY_SYMBOLS
961 RTS_DARWIN_ONLY_SYMBOLS
964 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
965 // dyld stub code contains references to this,
966 // but it should never be called because we treat
967 // lazy pointers as nonlazy.
968 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
970 { 0, 0 } /* sentinel */
975 /* -----------------------------------------------------------------------------
976 * Insert symbols into hash tables, checking for duplicates.
979 static void ghciInsertStrHashTable ( char* obj_name,
985 if (lookupHashTable(table, (StgWord)key) == NULL)
987 insertStrHashTable(table, (StgWord)key, data);
992 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
994 "whilst processing object file\n"
996 "This could be caused by:\n"
997 " * Loading two different object files which export the same symbol\n"
998 " * Specifying the same object file twice on the GHCi command line\n"
999 " * An incorrect `package.conf' entry, causing some object to be\n"
1001 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
1008 /* -----------------------------------------------------------------------------
1009 * initialize the object linker
1013 static int linker_init_done = 0 ;
1015 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1016 static void *dl_prog_handle;
1024 /* Make initLinker idempotent, so we can call it
1025 before evey relevant operation; that means we
1026 don't need to initialise the linker separately */
1027 if (linker_init_done == 1) { return; } else {
1028 linker_init_done = 1;
1031 stablehash = allocStrHashTable();
1032 symhash = allocStrHashTable();
1034 /* populate the symbol table with stuff from the RTS */
1035 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
1036 ghciInsertStrHashTable("(GHCi built-in symbols)",
1037 symhash, sym->lbl, sym->addr);
1039 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1040 machoInitSymbolsWithoutUnderscore();
1043 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1044 # if defined(RTLD_DEFAULT)
1045 dl_prog_handle = RTLD_DEFAULT;
1047 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
1048 # endif /* RTLD_DEFAULT */
1051 #if defined(x86_64_HOST_ARCH)
1052 if (RtsFlags.MiscFlags.linkerMemBase != 0) {
1053 // User-override for mmap_32bit_base
1054 mmap_32bit_base = (void*)RtsFlags.MiscFlags.linkerMemBase;
1059 /* -----------------------------------------------------------------------------
1060 * Loading DLL or .so dynamic libraries
1061 * -----------------------------------------------------------------------------
1063 * Add a DLL from which symbols may be found. In the ELF case, just
1064 * do RTLD_GLOBAL-style add, so no further messing around needs to
1065 * happen in order that symbols in the loaded .so are findable --
1066 * lookupSymbol() will subsequently see them by dlsym on the program's
1067 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
1069 * In the PEi386 case, open the DLLs and put handles to them in a
1070 * linked list. When looking for a symbol, try all handles in the
1071 * list. This means that we need to load even DLLs that are guaranteed
1072 * to be in the ghc.exe image already, just so we can get a handle
1073 * to give to loadSymbol, so that we can find the symbols. For such
1074 * libraries, the LoadLibrary call should be a no-op except for returning
1079 #if defined(OBJFORMAT_PEi386)
1080 /* A record for storing handles into DLLs. */
1085 struct _OpenedDLL* next;
1090 /* A list thereof. */
1091 static OpenedDLL* opened_dlls = NULL;
1095 addDLL( char *dll_name )
1097 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1098 /* ------------------- ELF DLL loader ------------------- */
1104 // omitted: RTLD_NOW
1105 // see http://www.haskell.org/pipermail/cvs-ghc/2007-September/038570.html
1106 hdl= dlopen(dll_name, RTLD_LAZY | RTLD_GLOBAL);
1109 /* dlopen failed; return a ptr to the error msg. */
1111 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1118 # elif defined(OBJFORMAT_PEi386)
1119 /* ------------------- Win32 DLL loader ------------------- */
1127 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1129 /* See if we've already got it, and ignore if so. */
1130 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1131 if (0 == strcmp(o_dll->name, dll_name))
1135 /* The file name has no suffix (yet) so that we can try
1136 both foo.dll and foo.drv
1138 The documentation for LoadLibrary says:
1139 If no file name extension is specified in the lpFileName
1140 parameter, the default library extension .dll is
1141 appended. However, the file name string can include a trailing
1142 point character (.) to indicate that the module name has no
1145 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1146 sprintf(buf, "%s.DLL", dll_name);
1147 instance = LoadLibrary(buf);
1148 if (instance == NULL) {
1149 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1150 // KAA: allow loading of drivers (like winspool.drv)
1151 sprintf(buf, "%s.DRV", dll_name);
1152 instance = LoadLibrary(buf);
1153 if (instance == NULL) {
1154 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1155 // #1883: allow loading of unix-style libfoo.dll DLLs
1156 sprintf(buf, "lib%s.DLL", dll_name);
1157 instance = LoadLibrary(buf);
1158 if (instance == NULL) {
1165 /* Add this DLL to the list of DLLs in which to search for symbols. */
1166 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1167 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1168 strcpy(o_dll->name, dll_name);
1169 o_dll->instance = instance;
1170 o_dll->next = opened_dlls;
1171 opened_dlls = o_dll;
1177 sysErrorBelch(dll_name);
1179 /* LoadLibrary failed; return a ptr to the error msg. */
1180 return "addDLL: could not load DLL";
1183 barf("addDLL: not implemented on this platform");
1187 /* -----------------------------------------------------------------------------
1188 * insert a stable symbol in the hash table
1192 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1194 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1198 /* -----------------------------------------------------------------------------
1199 * insert a symbol in the hash table
1202 insertSymbol(char* obj_name, char* key, void* data)
1204 ghciInsertStrHashTable(obj_name, symhash, key, data);
1207 /* -----------------------------------------------------------------------------
1208 * lookup a symbol in the hash table
1211 lookupSymbol( char *lbl )
1215 ASSERT(symhash != NULL);
1216 val = lookupStrHashTable(symhash, lbl);
1219 # if defined(OBJFORMAT_ELF)
1220 return dlsym(dl_prog_handle, lbl);
1221 # elif defined(OBJFORMAT_MACHO)
1223 /* On OS X 10.3 and later, we use dlsym instead of the old legacy
1226 HACK: On OS X, global symbols are prefixed with an underscore.
1227 However, dlsym wants us to omit the leading underscore from the
1228 symbol name. For now, we simply strip it off here (and ONLY
1231 ASSERT(lbl[0] == '_');
1232 return dlsym(dl_prog_handle, lbl+1);
1234 if(NSIsSymbolNameDefined(lbl)) {
1235 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1236 return NSAddressOfSymbol(symbol);
1240 # endif /* HAVE_DLFCN_H */
1241 # elif defined(OBJFORMAT_PEi386)
1244 sym = lookupSymbolInDLLs(lbl);
1245 if (sym != NULL) { return sym; };
1247 // Also try looking up the symbol without the @N suffix. Some
1248 // DLLs have the suffixes on their symbols, some don't.
1249 zapTrailingAtSign ( lbl );
1250 sym = lookupSymbolInDLLs(lbl);
1251 if (sym != NULL) { return sym; };
1263 /* -----------------------------------------------------------------------------
1264 * Debugging aid: look in GHCi's object symbol tables for symbols
1265 * within DELTA bytes of the specified address, and show their names.
1268 void ghci_enquire ( char* addr );
1270 void ghci_enquire ( char* addr )
1275 const int DELTA = 64;
1280 for (oc = objects; oc; oc = oc->next) {
1281 for (i = 0; i < oc->n_symbols; i++) {
1282 sym = oc->symbols[i];
1283 if (sym == NULL) continue;
1286 a = lookupStrHashTable(symhash, sym);
1289 // debugBelch("ghci_enquire: can't find %s\n", sym);
1291 else if (addr-DELTA <= a && a <= addr+DELTA) {
1292 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1299 #ifdef ia64_HOST_ARCH
1300 static unsigned int PLTSize(void);
1304 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1307 mmapForLinker (size_t bytes, nat flags, int fd)
1309 void *map_addr = NULL;
1312 static nat fixed = 0;
1314 pagesize = getpagesize();
1315 size = ROUND_UP(bytes, pagesize);
1317 #if defined(x86_64_HOST_ARCH)
1320 if (mmap_32bit_base != 0) {
1321 map_addr = mmap_32bit_base;
1325 result = mmap(map_addr, size, PROT_EXEC|PROT_READ|PROT_WRITE,
1326 MAP_PRIVATE|TRY_MAP_32BIT|fixed|flags, fd, 0);
1328 if (result == MAP_FAILED) {
1329 sysErrorBelch("mmap %lu bytes at %p",(lnat)size,map_addr);
1330 errorBelch("Try specifying an address with +RTS -xm<addr> -RTS");
1331 stg_exit(EXIT_FAILURE);
1334 #if defined(x86_64_HOST_ARCH)
1335 if (mmap_32bit_base != 0) {
1336 if (result == map_addr) {
1337 mmap_32bit_base = map_addr + size;
1339 if ((W_)result > 0x80000000) {
1340 // oops, we were given memory over 2Gb
1341 #if defined(freebsd_HOST_OS)
1342 // Some platforms require MAP_FIXED. This is normally
1343 // a bad idea, because MAP_FIXED will overwrite
1344 // existing mappings.
1345 munmap(result,size);
1349 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);
1352 // hmm, we were given memory somewhere else, but it's
1353 // still under 2Gb so we can use it. Next time, ask
1354 // for memory right after the place we just got some
1355 mmap_32bit_base = (void*)result + size;
1359 if ((W_)result > 0x80000000) {
1360 // oops, we were given memory over 2Gb
1361 // ... try allocating memory somewhere else?;
1362 debugTrace(DEBUG_linker,"MAP_32BIT didn't work; gave us %lu bytes at 0x%p", bytes, result);
1363 munmap(result, size);
1365 // Set a base address and try again... (guess: 1Gb)
1366 mmap_32bit_base = (void*)0x40000000;
1376 /* -----------------------------------------------------------------------------
1377 * Load an obj (populate the global symbol table, but don't resolve yet)
1379 * Returns: 1 if ok, 0 on error.
1382 loadObj( char *path )
1394 /* debugBelch("loadObj %s\n", path ); */
1396 /* Check that we haven't already loaded this object.
1397 Ignore requests to load multiple times */
1401 for (o = objects; o; o = o->next) {
1402 if (0 == strcmp(o->fileName, path)) {
1404 break; /* don't need to search further */
1408 IF_DEBUG(linker, debugBelch(
1409 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1410 "same object file twice:\n"
1412 "GHCi will ignore this, but be warned.\n"
1414 return 1; /* success */
1418 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1420 # if defined(OBJFORMAT_ELF)
1421 oc->formatName = "ELF";
1422 # elif defined(OBJFORMAT_PEi386)
1423 oc->formatName = "PEi386";
1424 # elif defined(OBJFORMAT_MACHO)
1425 oc->formatName = "Mach-O";
1428 barf("loadObj: not implemented on this platform");
1431 r = stat(path, &st);
1432 if (r == -1) { return 0; }
1434 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1435 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1436 strcpy(oc->fileName, path);
1438 oc->fileSize = st.st_size;
1440 oc->sections = NULL;
1441 oc->proddables = NULL;
1443 /* chain it onto the list of objects */
1448 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1450 #if defined(openbsd_HOST_OS)
1451 fd = open(path, O_RDONLY, S_IRUSR);
1453 fd = open(path, O_RDONLY);
1456 barf("loadObj: can't open `%s'", path);
1458 #ifdef ia64_HOST_ARCH
1459 /* The PLT needs to be right before the object */
1462 pagesize = getpagesize();
1463 n = ROUND_UP(PLTSize(), pagesize);
1464 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1465 if (oc->plt == MAP_FAILED)
1466 barf("loadObj: can't allocate PLT");
1469 map_addr = oc->plt + n;
1471 n = ROUND_UP(oc->fileSize, pagesize);
1472 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1473 MAP_PRIVATE|TRY_MAP_32BIT, fd, 0);
1474 if (oc->image == MAP_FAILED)
1475 barf("loadObj: can't map `%s'", path);
1478 oc->image = mmapForLinker(oc->fileSize, 0, fd);
1483 #else /* !USE_MMAP */
1484 /* load the image into memory */
1485 f = fopen(path, "rb");
1487 barf("loadObj: can't read `%s'", path);
1489 # if defined(mingw32_HOST_OS)
1490 // TODO: We would like to use allocateExec here, but allocateExec
1491 // cannot currently allocate blocks large enough.
1492 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1493 PAGE_EXECUTE_READWRITE);
1494 # elif defined(darwin_HOST_OS)
1495 // In a Mach-O .o file, all sections can and will be misaligned
1496 // if the total size of the headers is not a multiple of the
1497 // desired alignment. This is fine for .o files that only serve
1498 // as input for the static linker, but it's not fine for us,
1499 // as SSE (used by gcc for floating point) and Altivec require
1500 // 16-byte alignment.
1501 // We calculate the correct alignment from the header before
1502 // reading the file, and then we misalign oc->image on purpose so
1503 // that the actual sections end up aligned again.
1504 oc->misalignment = machoGetMisalignment(f);
1505 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1506 oc->image += oc->misalignment;
1508 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1513 n = fread ( oc->image, 1, oc->fileSize, f );
1514 if (n != oc->fileSize)
1515 barf("loadObj: error whilst reading `%s'", path);
1518 #endif /* USE_MMAP */
1520 # if defined(OBJFORMAT_MACHO) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1521 r = ocAllocateSymbolExtras_MachO ( oc );
1522 if (!r) { return r; }
1523 # elif defined(OBJFORMAT_ELF) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1524 r = ocAllocateSymbolExtras_ELF ( oc );
1525 if (!r) { return r; }
1528 /* verify the in-memory image */
1529 # if defined(OBJFORMAT_ELF)
1530 r = ocVerifyImage_ELF ( oc );
1531 # elif defined(OBJFORMAT_PEi386)
1532 r = ocVerifyImage_PEi386 ( oc );
1533 # elif defined(OBJFORMAT_MACHO)
1534 r = ocVerifyImage_MachO ( oc );
1536 barf("loadObj: no verify method");
1538 if (!r) { return r; }
1540 /* build the symbol list for this image */
1541 # if defined(OBJFORMAT_ELF)
1542 r = ocGetNames_ELF ( oc );
1543 # elif defined(OBJFORMAT_PEi386)
1544 r = ocGetNames_PEi386 ( oc );
1545 # elif defined(OBJFORMAT_MACHO)
1546 r = ocGetNames_MachO ( oc );
1548 barf("loadObj: no getNames method");
1550 if (!r) { return r; }
1552 /* loaded, but not resolved yet */
1553 oc->status = OBJECT_LOADED;
1558 /* -----------------------------------------------------------------------------
1559 * resolve all the currently unlinked objects in memory
1561 * Returns: 1 if ok, 0 on error.
1571 for (oc = objects; oc; oc = oc->next) {
1572 if (oc->status != OBJECT_RESOLVED) {
1573 # if defined(OBJFORMAT_ELF)
1574 r = ocResolve_ELF ( oc );
1575 # elif defined(OBJFORMAT_PEi386)
1576 r = ocResolve_PEi386 ( oc );
1577 # elif defined(OBJFORMAT_MACHO)
1578 r = ocResolve_MachO ( oc );
1580 barf("resolveObjs: not implemented on this platform");
1582 if (!r) { return r; }
1583 oc->status = OBJECT_RESOLVED;
1589 /* -----------------------------------------------------------------------------
1590 * delete an object from the pool
1593 unloadObj( char *path )
1595 ObjectCode *oc, *prev;
1597 ASSERT(symhash != NULL);
1598 ASSERT(objects != NULL);
1603 for (oc = objects; oc; prev = oc, oc = oc->next) {
1604 if (!strcmp(oc->fileName,path)) {
1606 /* Remove all the mappings for the symbols within this
1611 for (i = 0; i < oc->n_symbols; i++) {
1612 if (oc->symbols[i] != NULL) {
1613 removeStrHashTable(symhash, oc->symbols[i], NULL);
1621 prev->next = oc->next;
1624 // We're going to leave this in place, in case there are
1625 // any pointers from the heap into it:
1626 // #ifdef mingw32_HOST_OS
1627 // VirtualFree(oc->image);
1629 // stgFree(oc->image);
1631 stgFree(oc->fileName);
1632 stgFree(oc->symbols);
1633 stgFree(oc->sections);
1639 errorBelch("unloadObj: can't find `%s' to unload", path);
1643 /* -----------------------------------------------------------------------------
1644 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1645 * which may be prodded during relocation, and abort if we try and write
1646 * outside any of these.
1648 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1651 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1652 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1656 pb->next = oc->proddables;
1657 oc->proddables = pb;
1660 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1663 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1664 char* s = (char*)(pb->start);
1665 char* e = s + pb->size - 1;
1666 char* a = (char*)addr;
1667 /* Assumes that the biggest fixup involves a 4-byte write. This
1668 probably needs to be changed to 8 (ie, +7) on 64-bit
1670 if (a >= s && (a+3) <= e) return;
1672 barf("checkProddableBlock: invalid fixup in runtime linker");
1675 /* -----------------------------------------------------------------------------
1676 * Section management.
1678 static void addSection ( ObjectCode* oc, SectionKind kind,
1679 void* start, void* end )
1681 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1685 s->next = oc->sections;
1688 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1689 start, ((char*)end)-1, end - start + 1, kind );
1694 /* --------------------------------------------------------------------------
1696 * This is about allocating a small chunk of memory for every symbol in the
1697 * object file. We make sure that the SymboLExtras are always "in range" of
1698 * limited-range PC-relative instructions on various platforms by allocating
1699 * them right next to the object code itself.
1702 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
1705 ocAllocateSymbolExtras
1707 Allocate additional space at the end of the object file image to make room
1708 for jump islands (powerpc, x86_64) and GOT entries (x86_64).
1710 PowerPC relative branch instructions have a 24 bit displacement field.
1711 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1712 If a particular imported symbol is outside this range, we have to redirect
1713 the jump to a short piece of new code that just loads the 32bit absolute
1714 address and jumps there.
1715 On x86_64, PC-relative jumps and PC-relative accesses to the GOT are limited
1718 This function just allocates space for one SymbolExtra for every
1719 undefined symbol in the object file. The code for the jump islands is
1720 filled in by makeSymbolExtra below.
1723 static int ocAllocateSymbolExtras( ObjectCode* oc, int count, int first )
1730 int misalignment = 0;
1731 #ifdef darwin_HOST_OS
1732 misalignment = oc->misalignment;
1738 // round up to the nearest 4
1739 aligned = (oc->fileSize + 3) & ~3;
1742 pagesize = getpagesize();
1743 n = ROUND_UP( oc->fileSize, pagesize );
1744 m = ROUND_UP( aligned + sizeof (SymbolExtra) * count, pagesize );
1746 /* we try to use spare space at the end of the last page of the
1747 * image for the jump islands, but if there isn't enough space
1748 * then we have to map some (anonymously, remembering MAP_32BIT).
1750 if( m > n ) // we need to allocate more pages
1752 oc->symbol_extras = mmapForLinker(sizeof(SymbolExtra) * count,
1757 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1760 oc->image -= misalignment;
1761 oc->image = stgReallocBytes( oc->image,
1763 aligned + sizeof (SymbolExtra) * count,
1764 "ocAllocateSymbolExtras" );
1765 oc->image += misalignment;
1767 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1768 #endif /* USE_MMAP */
1770 memset( oc->symbol_extras, 0, sizeof (SymbolExtra) * count );
1773 oc->symbol_extras = NULL;
1775 oc->first_symbol_extra = first;
1776 oc->n_symbol_extras = count;
1781 static SymbolExtra* makeSymbolExtra( ObjectCode* oc,
1782 unsigned long symbolNumber,
1783 unsigned long target )
1787 ASSERT( symbolNumber >= oc->first_symbol_extra
1788 && symbolNumber - oc->first_symbol_extra < oc->n_symbol_extras);
1790 extra = &oc->symbol_extras[symbolNumber - oc->first_symbol_extra];
1792 #ifdef powerpc_HOST_ARCH
1793 // lis r12, hi16(target)
1794 extra->jumpIsland.lis_r12 = 0x3d80;
1795 extra->jumpIsland.hi_addr = target >> 16;
1797 // ori r12, r12, lo16(target)
1798 extra->jumpIsland.ori_r12_r12 = 0x618c;
1799 extra->jumpIsland.lo_addr = target & 0xffff;
1802 extra->jumpIsland.mtctr_r12 = 0x7d8903a6;
1805 extra->jumpIsland.bctr = 0x4e800420;
1807 #ifdef x86_64_HOST_ARCH
1809 static uint8_t jmp[] = { 0xFF, 0x25, 0xF2, 0xFF, 0xFF, 0xFF };
1810 extra->addr = target;
1811 memcpy(extra->jumpIsland, jmp, 6);
1819 /* --------------------------------------------------------------------------
1820 * PowerPC specifics (instruction cache flushing)
1821 * ------------------------------------------------------------------------*/
1823 #ifdef powerpc_TARGET_ARCH
1825 ocFlushInstructionCache
1827 Flush the data & instruction caches.
1828 Because the PPC has split data/instruction caches, we have to
1829 do that whenever we modify code at runtime.
1832 static void ocFlushInstructionCache( ObjectCode *oc )
1834 int n = (oc->fileSize + sizeof( SymbolExtra ) * oc->n_symbol_extras + 3) / 4;
1835 unsigned long *p = (unsigned long *) oc->image;
1839 __asm__ volatile ( "dcbf 0,%0\n\t"
1847 __asm__ volatile ( "sync\n\t"
1853 /* --------------------------------------------------------------------------
1854 * PEi386 specifics (Win32 targets)
1855 * ------------------------------------------------------------------------*/
1857 /* The information for this linker comes from
1858 Microsoft Portable Executable
1859 and Common Object File Format Specification
1860 revision 5.1 January 1998
1861 which SimonM says comes from the MS Developer Network CDs.
1863 It can be found there (on older CDs), but can also be found
1866 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1868 (this is Rev 6.0 from February 1999).
1870 Things move, so if that fails, try searching for it via
1872 http://www.google.com/search?q=PE+COFF+specification
1874 The ultimate reference for the PE format is the Winnt.h
1875 header file that comes with the Platform SDKs; as always,
1876 implementations will drift wrt their documentation.
1878 A good background article on the PE format is Matt Pietrek's
1879 March 1994 article in Microsoft System Journal (MSJ)
1880 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1881 Win32 Portable Executable File Format." The info in there
1882 has recently been updated in a two part article in
1883 MSDN magazine, issues Feb and March 2002,
1884 "Inside Windows: An In-Depth Look into the Win32 Portable
1885 Executable File Format"
1887 John Levine's book "Linkers and Loaders" contains useful
1892 #if defined(OBJFORMAT_PEi386)
1896 typedef unsigned char UChar;
1897 typedef unsigned short UInt16;
1898 typedef unsigned int UInt32;
1905 UInt16 NumberOfSections;
1906 UInt32 TimeDateStamp;
1907 UInt32 PointerToSymbolTable;
1908 UInt32 NumberOfSymbols;
1909 UInt16 SizeOfOptionalHeader;
1910 UInt16 Characteristics;
1914 #define sizeof_COFF_header 20
1921 UInt32 VirtualAddress;
1922 UInt32 SizeOfRawData;
1923 UInt32 PointerToRawData;
1924 UInt32 PointerToRelocations;
1925 UInt32 PointerToLinenumbers;
1926 UInt16 NumberOfRelocations;
1927 UInt16 NumberOfLineNumbers;
1928 UInt32 Characteristics;
1932 #define sizeof_COFF_section 40
1939 UInt16 SectionNumber;
1942 UChar NumberOfAuxSymbols;
1946 #define sizeof_COFF_symbol 18
1951 UInt32 VirtualAddress;
1952 UInt32 SymbolTableIndex;
1957 #define sizeof_COFF_reloc 10
1960 /* From PE spec doc, section 3.3.2 */
1961 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1962 windows.h -- for the same purpose, but I want to know what I'm
1964 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1965 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1966 #define MYIMAGE_FILE_DLL 0x2000
1967 #define MYIMAGE_FILE_SYSTEM 0x1000
1968 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1969 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1970 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1972 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1973 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1974 #define MYIMAGE_SYM_CLASS_STATIC 3
1975 #define MYIMAGE_SYM_UNDEFINED 0
1977 /* From PE spec doc, section 4.1 */
1978 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1979 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1980 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1982 /* From PE spec doc, section 5.2.1 */
1983 #define MYIMAGE_REL_I386_DIR32 0x0006
1984 #define MYIMAGE_REL_I386_REL32 0x0014
1987 /* We use myindex to calculate array addresses, rather than
1988 simply doing the normal subscript thing. That's because
1989 some of the above structs have sizes which are not
1990 a whole number of words. GCC rounds their sizes up to a
1991 whole number of words, which means that the address calcs
1992 arising from using normal C indexing or pointer arithmetic
1993 are just plain wrong. Sigh.
1996 myindex ( int scale, void* base, int index )
1999 ((UChar*)base) + scale * index;
2004 printName ( UChar* name, UChar* strtab )
2006 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2007 UInt32 strtab_offset = * (UInt32*)(name+4);
2008 debugBelch("%s", strtab + strtab_offset );
2011 for (i = 0; i < 8; i++) {
2012 if (name[i] == 0) break;
2013 debugBelch("%c", name[i] );
2020 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
2022 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2023 UInt32 strtab_offset = * (UInt32*)(name+4);
2024 strncpy ( dst, strtab+strtab_offset, dstSize );
2030 if (name[i] == 0) break;
2040 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
2043 /* If the string is longer than 8 bytes, look in the
2044 string table for it -- this will be correctly zero terminated.
2046 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2047 UInt32 strtab_offset = * (UInt32*)(name+4);
2048 return ((UChar*)strtab) + strtab_offset;
2050 /* Otherwise, if shorter than 8 bytes, return the original,
2051 which by defn is correctly terminated.
2053 if (name[7]==0) return name;
2054 /* The annoying case: 8 bytes. Copy into a temporary
2055 (which is never freed ...)
2057 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
2059 strncpy(newstr,name,8);
2065 /* Just compares the short names (first 8 chars) */
2066 static COFF_section *
2067 findPEi386SectionCalled ( ObjectCode* oc, char* name )
2071 = (COFF_header*)(oc->image);
2072 COFF_section* sectab
2074 ((UChar*)(oc->image))
2075 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2077 for (i = 0; i < hdr->NumberOfSections; i++) {
2080 COFF_section* section_i
2082 myindex ( sizeof_COFF_section, sectab, i );
2083 n1 = (UChar*) &(section_i->Name);
2085 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
2086 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
2087 n1[6]==n2[6] && n1[7]==n2[7])
2096 zapTrailingAtSign ( UChar* sym )
2098 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
2100 if (sym[0] == 0) return;
2102 while (sym[i] != 0) i++;
2105 while (j > 0 && my_isdigit(sym[j])) j--;
2106 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
2111 lookupSymbolInDLLs ( UChar *lbl )
2116 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
2117 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
2119 if (lbl[0] == '_') {
2120 /* HACK: if the name has an initial underscore, try stripping
2121 it off & look that up first. I've yet to verify whether there's
2122 a Rule that governs whether an initial '_' *should always* be
2123 stripped off when mapping from import lib name to the DLL name.
2125 sym = GetProcAddress(o_dll->instance, (lbl+1));
2127 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
2131 sym = GetProcAddress(o_dll->instance, lbl);
2133 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
2142 ocVerifyImage_PEi386 ( ObjectCode* oc )
2147 COFF_section* sectab;
2148 COFF_symbol* symtab;
2150 /* debugBelch("\nLOADING %s\n", oc->fileName); */
2151 hdr = (COFF_header*)(oc->image);
2152 sectab = (COFF_section*) (
2153 ((UChar*)(oc->image))
2154 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2156 symtab = (COFF_symbol*) (
2157 ((UChar*)(oc->image))
2158 + hdr->PointerToSymbolTable
2160 strtab = ((UChar*)symtab)
2161 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2163 if (hdr->Machine != 0x14c) {
2164 errorBelch("%s: Not x86 PEi386", oc->fileName);
2167 if (hdr->SizeOfOptionalHeader != 0) {
2168 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2171 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2172 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2173 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2174 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2175 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2178 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2179 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2180 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2182 (int)(hdr->Characteristics));
2185 /* If the string table size is way crazy, this might indicate that
2186 there are more than 64k relocations, despite claims to the
2187 contrary. Hence this test. */
2188 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2190 if ( (*(UInt32*)strtab) > 600000 ) {
2191 /* Note that 600k has no special significance other than being
2192 big enough to handle the almost-2MB-sized lumps that
2193 constitute HSwin32*.o. */
2194 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2199 /* No further verification after this point; only debug printing. */
2201 IF_DEBUG(linker, i=1);
2202 if (i == 0) return 1;
2204 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2205 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2206 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2209 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2210 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2211 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2212 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2213 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2214 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2215 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2217 /* Print the section table. */
2219 for (i = 0; i < hdr->NumberOfSections; i++) {
2221 COFF_section* sectab_i
2223 myindex ( sizeof_COFF_section, sectab, i );
2230 printName ( sectab_i->Name, strtab );
2240 sectab_i->VirtualSize,
2241 sectab_i->VirtualAddress,
2242 sectab_i->SizeOfRawData,
2243 sectab_i->PointerToRawData,
2244 sectab_i->NumberOfRelocations,
2245 sectab_i->PointerToRelocations,
2246 sectab_i->PointerToRawData
2248 reltab = (COFF_reloc*) (
2249 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2252 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2253 /* If the relocation field (a short) has overflowed, the
2254 * real count can be found in the first reloc entry.
2256 * See Section 4.1 (last para) of the PE spec (rev6.0).
2258 COFF_reloc* rel = (COFF_reloc*)
2259 myindex ( sizeof_COFF_reloc, reltab, 0 );
2260 noRelocs = rel->VirtualAddress;
2263 noRelocs = sectab_i->NumberOfRelocations;
2267 for (; j < noRelocs; j++) {
2269 COFF_reloc* rel = (COFF_reloc*)
2270 myindex ( sizeof_COFF_reloc, reltab, j );
2272 " type 0x%-4x vaddr 0x%-8x name `",
2274 rel->VirtualAddress );
2275 sym = (COFF_symbol*)
2276 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2277 /* Hmm..mysterious looking offset - what's it for? SOF */
2278 printName ( sym->Name, strtab -10 );
2285 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2286 debugBelch("---START of string table---\n");
2287 for (i = 4; i < *(Int32*)strtab; i++) {
2289 debugBelch("\n"); else
2290 debugBelch("%c", strtab[i] );
2292 debugBelch("--- END of string table---\n");
2297 COFF_symbol* symtab_i;
2298 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2299 symtab_i = (COFF_symbol*)
2300 myindex ( sizeof_COFF_symbol, symtab, i );
2306 printName ( symtab_i->Name, strtab );
2315 (Int32)(symtab_i->SectionNumber),
2316 (UInt32)symtab_i->Type,
2317 (UInt32)symtab_i->StorageClass,
2318 (UInt32)symtab_i->NumberOfAuxSymbols
2320 i += symtab_i->NumberOfAuxSymbols;
2330 ocGetNames_PEi386 ( ObjectCode* oc )
2333 COFF_section* sectab;
2334 COFF_symbol* symtab;
2341 hdr = (COFF_header*)(oc->image);
2342 sectab = (COFF_section*) (
2343 ((UChar*)(oc->image))
2344 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2346 symtab = (COFF_symbol*) (
2347 ((UChar*)(oc->image))
2348 + hdr->PointerToSymbolTable
2350 strtab = ((UChar*)(oc->image))
2351 + hdr->PointerToSymbolTable
2352 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2354 /* Allocate space for any (local, anonymous) .bss sections. */
2356 for (i = 0; i < hdr->NumberOfSections; i++) {
2359 COFF_section* sectab_i
2361 myindex ( sizeof_COFF_section, sectab, i );
2362 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2363 /* sof 10/05: the PE spec text isn't too clear regarding what
2364 * the SizeOfRawData field is supposed to hold for object
2365 * file sections containing just uninitialized data -- for executables,
2366 * it is supposed to be zero; unclear what it's supposed to be
2367 * for object files. However, VirtualSize is guaranteed to be
2368 * zero for object files, which definitely suggests that SizeOfRawData
2369 * will be non-zero (where else would the size of this .bss section be
2370 * stored?) Looking at the COFF_section info for incoming object files,
2371 * this certainly appears to be the case.
2373 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2374 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2375 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2376 * variable decls into to the .bss section. (The specific function in Q which
2377 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2379 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2380 /* This is a non-empty .bss section. Allocate zeroed space for
2381 it, and set its PointerToRawData field such that oc->image +
2382 PointerToRawData == addr_of_zeroed_space. */
2383 bss_sz = sectab_i->VirtualSize;
2384 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2385 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2386 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2387 addProddableBlock(oc, zspace, bss_sz);
2388 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2391 /* Copy section information into the ObjectCode. */
2393 for (i = 0; i < hdr->NumberOfSections; i++) {
2399 = SECTIONKIND_OTHER;
2400 COFF_section* sectab_i
2402 myindex ( sizeof_COFF_section, sectab, i );
2403 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2406 /* I'm sure this is the Right Way to do it. However, the
2407 alternative of testing the sectab_i->Name field seems to
2408 work ok with Cygwin.
2410 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2411 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2412 kind = SECTIONKIND_CODE_OR_RODATA;
2415 if (0==strcmp(".text",sectab_i->Name) ||
2416 0==strcmp(".rdata",sectab_i->Name)||
2417 0==strcmp(".rodata",sectab_i->Name))
2418 kind = SECTIONKIND_CODE_OR_RODATA;
2419 if (0==strcmp(".data",sectab_i->Name) ||
2420 0==strcmp(".bss",sectab_i->Name))
2421 kind = SECTIONKIND_RWDATA;
2423 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2424 sz = sectab_i->SizeOfRawData;
2425 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2427 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2428 end = start + sz - 1;
2430 if (kind == SECTIONKIND_OTHER
2431 /* Ignore sections called which contain stabs debugging
2433 && 0 != strcmp(".stab", sectab_i->Name)
2434 && 0 != strcmp(".stabstr", sectab_i->Name)
2435 /* ignore constructor section for now */
2436 && 0 != strcmp(".ctors", sectab_i->Name)
2437 /* ignore section generated from .ident */
2438 && 0!= strcmp("/4", sectab_i->Name)
2439 /* ignore unknown section that appeared in gcc 3.4.5(?) */
2440 && 0!= strcmp(".reloc", sectab_i->Name)
2442 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2446 if (kind != SECTIONKIND_OTHER && end >= start) {
2447 addSection(oc, kind, start, end);
2448 addProddableBlock(oc, start, end - start + 1);
2452 /* Copy exported symbols into the ObjectCode. */
2454 oc->n_symbols = hdr->NumberOfSymbols;
2455 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2456 "ocGetNames_PEi386(oc->symbols)");
2457 /* Call me paranoid; I don't care. */
2458 for (i = 0; i < oc->n_symbols; i++)
2459 oc->symbols[i] = NULL;
2463 COFF_symbol* symtab_i;
2464 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2465 symtab_i = (COFF_symbol*)
2466 myindex ( sizeof_COFF_symbol, symtab, i );
2470 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2471 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2472 /* This symbol is global and defined, viz, exported */
2473 /* for MYIMAGE_SYMCLASS_EXTERNAL
2474 && !MYIMAGE_SYM_UNDEFINED,
2475 the address of the symbol is:
2476 address of relevant section + offset in section
2478 COFF_section* sectabent
2479 = (COFF_section*) myindex ( sizeof_COFF_section,
2481 symtab_i->SectionNumber-1 );
2482 addr = ((UChar*)(oc->image))
2483 + (sectabent->PointerToRawData
2487 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2488 && symtab_i->Value > 0) {
2489 /* This symbol isn't in any section at all, ie, global bss.
2490 Allocate zeroed space for it. */
2491 addr = stgCallocBytes(1, symtab_i->Value,
2492 "ocGetNames_PEi386(non-anonymous bss)");
2493 addSection(oc, SECTIONKIND_RWDATA, addr,
2494 ((UChar*)addr) + symtab_i->Value - 1);
2495 addProddableBlock(oc, addr, symtab_i->Value);
2496 /* debugBelch("BSS section at 0x%x\n", addr); */
2499 if (addr != NULL ) {
2500 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2501 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2502 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2503 ASSERT(i >= 0 && i < oc->n_symbols);
2504 /* cstring_from_COFF_symbol_name always succeeds. */
2505 oc->symbols[i] = sname;
2506 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2510 "IGNORING symbol %d\n"
2514 printName ( symtab_i->Name, strtab );
2523 (Int32)(symtab_i->SectionNumber),
2524 (UInt32)symtab_i->Type,
2525 (UInt32)symtab_i->StorageClass,
2526 (UInt32)symtab_i->NumberOfAuxSymbols
2531 i += symtab_i->NumberOfAuxSymbols;
2540 ocResolve_PEi386 ( ObjectCode* oc )
2543 COFF_section* sectab;
2544 COFF_symbol* symtab;
2554 /* ToDo: should be variable-sized? But is at least safe in the
2555 sense of buffer-overrun-proof. */
2557 /* debugBelch("resolving for %s\n", oc->fileName); */
2559 hdr = (COFF_header*)(oc->image);
2560 sectab = (COFF_section*) (
2561 ((UChar*)(oc->image))
2562 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2564 symtab = (COFF_symbol*) (
2565 ((UChar*)(oc->image))
2566 + hdr->PointerToSymbolTable
2568 strtab = ((UChar*)(oc->image))
2569 + hdr->PointerToSymbolTable
2570 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2572 for (i = 0; i < hdr->NumberOfSections; i++) {
2573 COFF_section* sectab_i
2575 myindex ( sizeof_COFF_section, sectab, i );
2578 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2581 /* Ignore sections called which contain stabs debugging
2583 if (0 == strcmp(".stab", sectab_i->Name)
2584 || 0 == strcmp(".stabstr", sectab_i->Name)
2585 || 0 == strcmp(".ctors", sectab_i->Name))
2588 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2589 /* If the relocation field (a short) has overflowed, the
2590 * real count can be found in the first reloc entry.
2592 * See Section 4.1 (last para) of the PE spec (rev6.0).
2594 * Nov2003 update: the GNU linker still doesn't correctly
2595 * handle the generation of relocatable object files with
2596 * overflown relocations. Hence the output to warn of potential
2599 COFF_reloc* rel = (COFF_reloc*)
2600 myindex ( sizeof_COFF_reloc, reltab, 0 );
2601 noRelocs = rel->VirtualAddress;
2603 /* 10/05: we now assume (and check for) a GNU ld that is capable
2604 * of handling object files with (>2^16) of relocs.
2607 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2612 noRelocs = sectab_i->NumberOfRelocations;
2617 for (; j < noRelocs; j++) {
2619 COFF_reloc* reltab_j
2621 myindex ( sizeof_COFF_reloc, reltab, j );
2623 /* the location to patch */
2625 ((UChar*)(oc->image))
2626 + (sectab_i->PointerToRawData
2627 + reltab_j->VirtualAddress
2628 - sectab_i->VirtualAddress )
2630 /* the existing contents of pP */
2632 /* the symbol to connect to */
2633 sym = (COFF_symbol*)
2634 myindex ( sizeof_COFF_symbol,
2635 symtab, reltab_j->SymbolTableIndex );
2638 "reloc sec %2d num %3d: type 0x%-4x "
2639 "vaddr 0x%-8x name `",
2641 (UInt32)reltab_j->Type,
2642 reltab_j->VirtualAddress );
2643 printName ( sym->Name, strtab );
2644 debugBelch("'\n" ));
2646 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2647 COFF_section* section_sym
2648 = findPEi386SectionCalled ( oc, sym->Name );
2650 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2653 S = ((UInt32)(oc->image))
2654 + (section_sym->PointerToRawData
2657 copyName ( sym->Name, strtab, symbol, 1000-1 );
2658 S = (UInt32) lookupSymbol( symbol );
2659 if ((void*)S != NULL) goto foundit;
2660 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
2664 checkProddableBlock(oc, pP);
2665 switch (reltab_j->Type) {
2666 case MYIMAGE_REL_I386_DIR32:
2669 case MYIMAGE_REL_I386_REL32:
2670 /* Tricky. We have to insert a displacement at
2671 pP which, when added to the PC for the _next_
2672 insn, gives the address of the target (S).
2673 Problem is to know the address of the next insn
2674 when we only know pP. We assume that this
2675 literal field is always the last in the insn,
2676 so that the address of the next insn is pP+4
2677 -- hence the constant 4.
2678 Also I don't know if A should be added, but so
2679 far it has always been zero.
2681 SOF 05/2005: 'A' (old contents of *pP) have been observed
2682 to contain values other than zero (the 'wx' object file
2683 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2684 So, add displacement to old value instead of asserting
2685 A to be zero. Fixes wxhaskell-related crashes, and no other
2686 ill effects have been observed.
2688 Update: the reason why we're seeing these more elaborate
2689 relocations is due to a switch in how the NCG compiles SRTs
2690 and offsets to them from info tables. SRTs live in .(ro)data,
2691 while info tables live in .text, causing GAS to emit REL32/DISP32
2692 relocations with non-zero values. Adding the displacement is
2693 the right thing to do.
2695 *pP = S - ((UInt32)pP) - 4 + A;
2698 debugBelch("%s: unhandled PEi386 relocation type %d",
2699 oc->fileName, reltab_j->Type);
2706 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2710 #endif /* defined(OBJFORMAT_PEi386) */
2713 /* --------------------------------------------------------------------------
2715 * ------------------------------------------------------------------------*/
2717 #if defined(OBJFORMAT_ELF)
2722 #if defined(sparc_HOST_ARCH)
2723 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2724 #elif defined(i386_HOST_ARCH)
2725 # define ELF_TARGET_386 /* Used inside <elf.h> */
2726 #elif defined(x86_64_HOST_ARCH)
2727 # define ELF_TARGET_X64_64
2729 #elif defined (ia64_HOST_ARCH)
2730 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2732 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2733 # define ELF_NEED_GOT /* needs Global Offset Table */
2734 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2737 #if !defined(openbsd_HOST_OS)
2740 /* openbsd elf has things in different places, with diff names */
2741 # include <elf_abi.h>
2742 # include <machine/reloc.h>
2743 # define R_386_32 RELOC_32
2744 # define R_386_PC32 RELOC_PC32
2747 /* If elf.h doesn't define it */
2748 # ifndef R_X86_64_PC64
2749 # define R_X86_64_PC64 24
2753 * Define a set of types which can be used for both ELF32 and ELF64
2757 #define ELFCLASS ELFCLASS64
2758 #define Elf_Addr Elf64_Addr
2759 #define Elf_Word Elf64_Word
2760 #define Elf_Sword Elf64_Sword
2761 #define Elf_Ehdr Elf64_Ehdr
2762 #define Elf_Phdr Elf64_Phdr
2763 #define Elf_Shdr Elf64_Shdr
2764 #define Elf_Sym Elf64_Sym
2765 #define Elf_Rel Elf64_Rel
2766 #define Elf_Rela Elf64_Rela
2767 #define ELF_ST_TYPE ELF64_ST_TYPE
2768 #define ELF_ST_BIND ELF64_ST_BIND
2769 #define ELF_R_TYPE ELF64_R_TYPE
2770 #define ELF_R_SYM ELF64_R_SYM
2772 #define ELFCLASS ELFCLASS32
2773 #define Elf_Addr Elf32_Addr
2774 #define Elf_Word Elf32_Word
2775 #define Elf_Sword Elf32_Sword
2776 #define Elf_Ehdr Elf32_Ehdr
2777 #define Elf_Phdr Elf32_Phdr
2778 #define Elf_Shdr Elf32_Shdr
2779 #define Elf_Sym Elf32_Sym
2780 #define Elf_Rel Elf32_Rel
2781 #define Elf_Rela Elf32_Rela
2783 #define ELF_ST_TYPE ELF32_ST_TYPE
2786 #define ELF_ST_BIND ELF32_ST_BIND
2789 #define ELF_R_TYPE ELF32_R_TYPE
2792 #define ELF_R_SYM ELF32_R_SYM
2798 * Functions to allocate entries in dynamic sections. Currently we simply
2799 * preallocate a large number, and we don't check if a entry for the given
2800 * target already exists (a linear search is too slow). Ideally these
2801 * entries would be associated with symbols.
2804 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2805 #define GOT_SIZE 0x20000
2806 #define FUNCTION_TABLE_SIZE 0x10000
2807 #define PLT_SIZE 0x08000
2810 static Elf_Addr got[GOT_SIZE];
2811 static unsigned int gotIndex;
2812 static Elf_Addr gp_val = (Elf_Addr)got;
2815 allocateGOTEntry(Elf_Addr target)
2819 if (gotIndex >= GOT_SIZE)
2820 barf("Global offset table overflow");
2822 entry = &got[gotIndex++];
2824 return (Elf_Addr)entry;
2828 #ifdef ELF_FUNCTION_DESC
2834 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2835 static unsigned int functionTableIndex;
2838 allocateFunctionDesc(Elf_Addr target)
2840 FunctionDesc *entry;
2842 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2843 barf("Function table overflow");
2845 entry = &functionTable[functionTableIndex++];
2847 entry->gp = (Elf_Addr)gp_val;
2848 return (Elf_Addr)entry;
2852 copyFunctionDesc(Elf_Addr target)
2854 FunctionDesc *olddesc = (FunctionDesc *)target;
2855 FunctionDesc *newdesc;
2857 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2858 newdesc->gp = olddesc->gp;
2859 return (Elf_Addr)newdesc;
2864 #ifdef ia64_HOST_ARCH
2865 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2866 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2868 static unsigned char plt_code[] =
2870 /* taken from binutils bfd/elfxx-ia64.c */
2871 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2872 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2873 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2874 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2875 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2876 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2879 /* If we can't get to the function descriptor via gp, take a local copy of it */
2880 #define PLT_RELOC(code, target) { \
2881 Elf64_Sxword rel_value = target - gp_val; \
2882 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2883 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2885 ia64_reloc_gprel22((Elf_Addr)code, target); \
2890 unsigned char code[sizeof(plt_code)];
2894 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2896 PLTEntry *plt = (PLTEntry *)oc->plt;
2899 if (oc->pltIndex >= PLT_SIZE)
2900 barf("Procedure table overflow");
2902 entry = &plt[oc->pltIndex++];
2903 memcpy(entry->code, plt_code, sizeof(entry->code));
2904 PLT_RELOC(entry->code, target);
2905 return (Elf_Addr)entry;
2911 return (PLT_SIZE * sizeof(PLTEntry));
2917 * Generic ELF functions
2921 findElfSection ( void* objImage, Elf_Word sh_type )
2923 char* ehdrC = (char*)objImage;
2924 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2925 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2926 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2930 for (i = 0; i < ehdr->e_shnum; i++) {
2931 if (shdr[i].sh_type == sh_type
2932 /* Ignore the section header's string table. */
2933 && i != ehdr->e_shstrndx
2934 /* Ignore string tables named .stabstr, as they contain
2936 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2938 ptr = ehdrC + shdr[i].sh_offset;
2945 #if defined(ia64_HOST_ARCH)
2947 findElfSegment ( void* objImage, Elf_Addr vaddr )
2949 char* ehdrC = (char*)objImage;
2950 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2951 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2952 Elf_Addr segaddr = 0;
2955 for (i = 0; i < ehdr->e_phnum; i++) {
2956 segaddr = phdr[i].p_vaddr;
2957 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2965 ocVerifyImage_ELF ( ObjectCode* oc )
2969 int i, j, nent, nstrtab, nsymtabs;
2973 char* ehdrC = (char*)(oc->image);
2974 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2976 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2977 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2978 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2979 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2980 errorBelch("%s: not an ELF object", oc->fileName);
2984 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2985 errorBelch("%s: unsupported ELF format", oc->fileName);
2989 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2990 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2992 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2993 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2995 errorBelch("%s: unknown endiannness", oc->fileName);
2999 if (ehdr->e_type != ET_REL) {
3000 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
3003 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
3005 IF_DEBUG(linker,debugBelch( "Architecture is " ));
3006 switch (ehdr->e_machine) {
3007 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
3008 #ifdef EM_SPARC32PLUS
3009 case EM_SPARC32PLUS:
3011 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
3013 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
3015 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
3017 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
3018 #elif defined(EM_AMD64)
3019 case EM_AMD64: IF_DEBUG(linker,debugBelch( "amd64" )); break;
3021 default: IF_DEBUG(linker,debugBelch( "unknown" ));
3022 errorBelch("%s: unknown architecture (e_machine == %d)"
3023 , oc->fileName, ehdr->e_machine);
3027 IF_DEBUG(linker,debugBelch(
3028 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
3029 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
3031 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
3033 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3035 if (ehdr->e_shstrndx == SHN_UNDEF) {
3036 errorBelch("%s: no section header string table", oc->fileName);
3039 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
3041 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
3044 for (i = 0; i < ehdr->e_shnum; i++) {
3045 IF_DEBUG(linker,debugBelch("%2d: ", i ));
3046 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
3047 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
3048 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
3049 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
3050 ehdrC + shdr[i].sh_offset,
3051 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
3053 if (shdr[i].sh_type == SHT_REL) {
3054 IF_DEBUG(linker,debugBelch("Rel " ));
3055 } else if (shdr[i].sh_type == SHT_RELA) {
3056 IF_DEBUG(linker,debugBelch("RelA " ));
3058 IF_DEBUG(linker,debugBelch(" "));
3061 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
3065 IF_DEBUG(linker,debugBelch( "\nString tables" ));
3068 for (i = 0; i < ehdr->e_shnum; i++) {
3069 if (shdr[i].sh_type == SHT_STRTAB
3070 /* Ignore the section header's string table. */
3071 && i != ehdr->e_shstrndx
3072 /* Ignore string tables named .stabstr, as they contain
3074 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
3076 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
3077 strtab = ehdrC + shdr[i].sh_offset;
3082 errorBelch("%s: no string tables, or too many", oc->fileName);
3087 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
3088 for (i = 0; i < ehdr->e_shnum; i++) {
3089 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3090 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
3092 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3093 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3094 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
3096 (long)shdr[i].sh_size % sizeof(Elf_Sym)
3098 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
3099 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
3102 for (j = 0; j < nent; j++) {
3103 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3104 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3105 (int)stab[j].st_shndx,
3106 (int)stab[j].st_size,
3107 (char*)stab[j].st_value ));
3109 IF_DEBUG(linker,debugBelch("type=" ));
3110 switch (ELF_ST_TYPE(stab[j].st_info)) {
3111 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3112 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3113 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3114 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3115 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3116 default: IF_DEBUG(linker,debugBelch("? " )); break;
3118 IF_DEBUG(linker,debugBelch(" " ));
3120 IF_DEBUG(linker,debugBelch("bind=" ));
3121 switch (ELF_ST_BIND(stab[j].st_info)) {
3122 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3123 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3124 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3125 default: IF_DEBUG(linker,debugBelch("? " )); break;
3127 IF_DEBUG(linker,debugBelch(" " ));
3129 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3133 if (nsymtabs == 0) {
3134 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3141 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3145 if (hdr->sh_type == SHT_PROGBITS
3146 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3147 /* .text-style section */
3148 return SECTIONKIND_CODE_OR_RODATA;
3151 if (hdr->sh_type == SHT_PROGBITS
3152 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3153 /* .data-style section */
3154 return SECTIONKIND_RWDATA;
3157 if (hdr->sh_type == SHT_PROGBITS
3158 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3159 /* .rodata-style section */
3160 return SECTIONKIND_CODE_OR_RODATA;
3163 if (hdr->sh_type == SHT_NOBITS
3164 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3165 /* .bss-style section */
3167 return SECTIONKIND_RWDATA;
3170 return SECTIONKIND_OTHER;
3175 ocGetNames_ELF ( ObjectCode* oc )
3180 char* ehdrC = (char*)(oc->image);
3181 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3182 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3183 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3185 ASSERT(symhash != NULL);
3188 errorBelch("%s: no strtab", oc->fileName);
3193 for (i = 0; i < ehdr->e_shnum; i++) {
3194 /* Figure out what kind of section it is. Logic derived from
3195 Figure 1.14 ("Special Sections") of the ELF document
3196 ("Portable Formats Specification, Version 1.1"). */
3198 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3200 if (is_bss && shdr[i].sh_size > 0) {
3201 /* This is a non-empty .bss section. Allocate zeroed space for
3202 it, and set its .sh_offset field such that
3203 ehdrC + .sh_offset == addr_of_zeroed_space. */
3204 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3205 "ocGetNames_ELF(BSS)");
3206 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3208 debugBelch("BSS section at 0x%x, size %d\n",
3209 zspace, shdr[i].sh_size);
3213 /* fill in the section info */
3214 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3215 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3216 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3217 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3220 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3222 /* copy stuff into this module's object symbol table */
3223 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3224 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3226 oc->n_symbols = nent;
3227 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3228 "ocGetNames_ELF(oc->symbols)");
3230 for (j = 0; j < nent; j++) {
3232 char isLocal = FALSE; /* avoids uninit-var warning */
3234 char* nm = strtab + stab[j].st_name;
3235 int secno = stab[j].st_shndx;
3237 /* Figure out if we want to add it; if so, set ad to its
3238 address. Otherwise leave ad == NULL. */
3240 if (secno == SHN_COMMON) {
3242 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3244 debugBelch("COMMON symbol, size %d name %s\n",
3245 stab[j].st_size, nm);
3247 /* Pointless to do addProddableBlock() for this area,
3248 since the linker should never poke around in it. */
3251 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3252 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3254 /* and not an undefined symbol */
3255 && stab[j].st_shndx != SHN_UNDEF
3256 /* and not in a "special section" */
3257 && stab[j].st_shndx < SHN_LORESERVE
3259 /* and it's a not a section or string table or anything silly */
3260 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3261 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3262 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3265 /* Section 0 is the undefined section, hence > and not >=. */
3266 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3268 if (shdr[secno].sh_type == SHT_NOBITS) {
3269 debugBelch(" BSS symbol, size %d off %d name %s\n",
3270 stab[j].st_size, stab[j].st_value, nm);
3273 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3274 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3277 #ifdef ELF_FUNCTION_DESC
3278 /* dlsym() and the initialisation table both give us function
3279 * descriptors, so to be consistent we store function descriptors
3280 * in the symbol table */
3281 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3282 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3284 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s\n",
3285 ad, oc->fileName, nm ));
3290 /* And the decision is ... */
3294 oc->symbols[j] = nm;
3297 /* Ignore entirely. */
3299 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3303 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3304 strtab + stab[j].st_name ));
3307 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3308 (int)ELF_ST_BIND(stab[j].st_info),
3309 (int)ELF_ST_TYPE(stab[j].st_info),
3310 (int)stab[j].st_shndx,
3311 strtab + stab[j].st_name
3314 oc->symbols[j] = NULL;
3323 /* Do ELF relocations which lack an explicit addend. All x86-linux
3324 relocations appear to be of this form. */
3326 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3327 Elf_Shdr* shdr, int shnum,
3328 Elf_Sym* stab, char* strtab )
3333 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3334 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3335 int target_shndx = shdr[shnum].sh_info;
3336 int symtab_shndx = shdr[shnum].sh_link;
3338 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3339 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3340 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3341 target_shndx, symtab_shndx ));
3343 /* Skip sections that we're not interested in. */
3346 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3347 if (kind == SECTIONKIND_OTHER) {
3348 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3353 for (j = 0; j < nent; j++) {
3354 Elf_Addr offset = rtab[j].r_offset;
3355 Elf_Addr info = rtab[j].r_info;
3357 Elf_Addr P = ((Elf_Addr)targ) + offset;
3358 Elf_Word* pP = (Elf_Word*)P;
3363 StgStablePtr stablePtr;
3366 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3367 j, (void*)offset, (void*)info ));
3369 IF_DEBUG(linker,debugBelch( " ZERO" ));
3372 Elf_Sym sym = stab[ELF_R_SYM(info)];
3373 /* First see if it is a local symbol. */
3374 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3375 /* Yes, so we can get the address directly from the ELF symbol
3377 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3379 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3380 + stab[ELF_R_SYM(info)].st_value);
3383 symbol = strtab + sym.st_name;
3384 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3385 if (NULL == stablePtr) {
3386 /* No, so look up the name in our global table. */
3387 S_tmp = lookupSymbol( symbol );
3388 S = (Elf_Addr)S_tmp;
3390 stableVal = deRefStablePtr( stablePtr );
3392 S = (Elf_Addr)S_tmp;
3396 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3399 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3402 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3403 (void*)P, (void*)S, (void*)A ));
3404 checkProddableBlock ( oc, pP );
3408 switch (ELF_R_TYPE(info)) {
3409 # ifdef i386_HOST_ARCH
3410 case R_386_32: *pP = value; break;
3411 case R_386_PC32: *pP = value - P; break;
3414 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3415 oc->fileName, (lnat)ELF_R_TYPE(info));
3423 /* Do ELF relocations for which explicit addends are supplied.
3424 sparc-solaris relocations appear to be of this form. */
3426 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3427 Elf_Shdr* shdr, int shnum,
3428 Elf_Sym* stab, char* strtab )
3431 char *symbol = NULL;
3433 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3434 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3435 int target_shndx = shdr[shnum].sh_info;
3436 int symtab_shndx = shdr[shnum].sh_link;
3438 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3439 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3440 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3441 target_shndx, symtab_shndx ));
3443 for (j = 0; j < nent; j++) {
3444 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3445 /* This #ifdef only serves to avoid unused-var warnings. */
3446 Elf_Addr offset = rtab[j].r_offset;
3447 Elf_Addr P = targ + offset;
3449 Elf_Addr info = rtab[j].r_info;
3450 Elf_Addr A = rtab[j].r_addend;
3454 # if defined(sparc_HOST_ARCH)
3455 Elf_Word* pP = (Elf_Word*)P;
3457 # elif defined(ia64_HOST_ARCH)
3458 Elf64_Xword *pP = (Elf64_Xword *)P;
3460 # elif defined(powerpc_HOST_ARCH)
3464 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3465 j, (void*)offset, (void*)info,
3468 IF_DEBUG(linker,debugBelch( " ZERO" ));
3471 Elf_Sym sym = stab[ELF_R_SYM(info)];
3472 /* First see if it is a local symbol. */
3473 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3474 /* Yes, so we can get the address directly from the ELF symbol
3476 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3478 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3479 + stab[ELF_R_SYM(info)].st_value);
3480 #ifdef ELF_FUNCTION_DESC
3481 /* Make a function descriptor for this function */
3482 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3483 S = allocateFunctionDesc(S + A);
3488 /* No, so look up the name in our global table. */
3489 symbol = strtab + sym.st_name;
3490 S_tmp = lookupSymbol( symbol );
3491 S = (Elf_Addr)S_tmp;
3493 #ifdef ELF_FUNCTION_DESC
3494 /* If a function, already a function descriptor - we would
3495 have to copy it to add an offset. */
3496 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3497 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3501 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3504 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3507 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3508 (void*)P, (void*)S, (void*)A ));
3509 /* checkProddableBlock ( oc, (void*)P ); */
3513 switch (ELF_R_TYPE(info)) {
3514 # if defined(sparc_HOST_ARCH)
3515 case R_SPARC_WDISP30:
3516 w1 = *pP & 0xC0000000;
3517 w2 = (Elf_Word)((value - P) >> 2);
3518 ASSERT((w2 & 0xC0000000) == 0);
3523 w1 = *pP & 0xFFC00000;
3524 w2 = (Elf_Word)(value >> 10);
3525 ASSERT((w2 & 0xFFC00000) == 0);
3531 w2 = (Elf_Word)(value & 0x3FF);
3532 ASSERT((w2 & ~0x3FF) == 0);
3536 /* According to the Sun documentation:
3538 This relocation type resembles R_SPARC_32, except it refers to an
3539 unaligned word. That is, the word to be relocated must be treated
3540 as four separate bytes with arbitrary alignment, not as a word
3541 aligned according to the architecture requirements.
3543 (JRS: which means that freeloading on the R_SPARC_32 case
3544 is probably wrong, but hey ...)
3548 w2 = (Elf_Word)value;
3551 # elif defined(ia64_HOST_ARCH)
3552 case R_IA64_DIR64LSB:
3553 case R_IA64_FPTR64LSB:
3556 case R_IA64_PCREL64LSB:
3559 case R_IA64_SEGREL64LSB:
3560 addr = findElfSegment(ehdrC, value);
3563 case R_IA64_GPREL22:
3564 ia64_reloc_gprel22(P, value);
3566 case R_IA64_LTOFF22:
3567 case R_IA64_LTOFF22X:
3568 case R_IA64_LTOFF_FPTR22:
3569 addr = allocateGOTEntry(value);
3570 ia64_reloc_gprel22(P, addr);
3572 case R_IA64_PCREL21B:
3573 ia64_reloc_pcrel21(P, S, oc);
3576 /* This goes with R_IA64_LTOFF22X and points to the load to
3577 * convert into a move. We don't implement relaxation. */
3579 # elif defined(powerpc_HOST_ARCH)
3580 case R_PPC_ADDR16_LO:
3581 *(Elf32_Half*) P = value;
3584 case R_PPC_ADDR16_HI:
3585 *(Elf32_Half*) P = value >> 16;
3588 case R_PPC_ADDR16_HA:
3589 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3593 *(Elf32_Word *) P = value;
3597 *(Elf32_Word *) P = value - P;
3603 if( delta << 6 >> 6 != delta )
3605 value = (Elf_Addr) (&makeSymbolExtra( oc, ELF_R_SYM(info), value )
3609 if( value == 0 || delta << 6 >> 6 != delta )
3611 barf( "Unable to make SymbolExtra for #%d",
3617 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3618 | (delta & 0x3fffffc);
3622 #if x86_64_HOST_ARCH
3624 *(Elf64_Xword *)P = value;
3629 StgInt64 off = value - P;
3630 if (off >= 0x7fffffffL || off < -0x80000000L) {
3631 #if X86_64_ELF_NONPIC_HACK
3632 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3634 off = pltAddress + A - P;
3636 barf("R_X86_64_PC32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3637 symbol, off, oc->fileName );
3640 *(Elf64_Word *)P = (Elf64_Word)off;
3646 StgInt64 off = value - P;
3647 *(Elf64_Word *)P = (Elf64_Word)off;
3652 if (value >= 0x7fffffffL) {
3653 #if X86_64_ELF_NONPIC_HACK
3654 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3656 value = pltAddress + A;
3658 barf("R_X86_64_32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3659 symbol, value, oc->fileName );
3662 *(Elf64_Word *)P = (Elf64_Word)value;
3666 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3667 #if X86_64_ELF_NONPIC_HACK
3668 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3670 value = pltAddress + A;
3672 barf("R_X86_64_32S relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3673 symbol, value, oc->fileName );
3676 *(Elf64_Sword *)P = (Elf64_Sword)value;
3679 case R_X86_64_GOTPCREL:
3681 StgInt64 gotAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)->addr;
3682 StgInt64 off = gotAddress + A - P;
3683 *(Elf64_Word *)P = (Elf64_Word)off;
3687 case R_X86_64_PLT32:
3689 StgInt64 off = value - P;
3690 if (off >= 0x7fffffffL || off < -0x80000000L) {
3691 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3693 off = pltAddress + A - P;
3695 *(Elf64_Word *)P = (Elf64_Word)off;
3701 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3702 oc->fileName, (lnat)ELF_R_TYPE(info));
3711 ocResolve_ELF ( ObjectCode* oc )
3715 Elf_Sym* stab = NULL;
3716 char* ehdrC = (char*)(oc->image);
3717 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3718 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3720 /* first find "the" symbol table */
3721 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3723 /* also go find the string table */
3724 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3726 if (stab == NULL || strtab == NULL) {
3727 errorBelch("%s: can't find string or symbol table", oc->fileName);
3731 /* Process the relocation sections. */
3732 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3733 if (shdr[shnum].sh_type == SHT_REL) {
3734 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3735 shnum, stab, strtab );
3739 if (shdr[shnum].sh_type == SHT_RELA) {
3740 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3741 shnum, stab, strtab );
3746 #if defined(powerpc_HOST_ARCH)
3747 ocFlushInstructionCache( oc );
3755 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3756 * at the front. The following utility functions pack and unpack instructions, and
3757 * take care of the most common relocations.
3760 #ifdef ia64_HOST_ARCH
3763 ia64_extract_instruction(Elf64_Xword *target)
3766 int slot = (Elf_Addr)target & 3;
3767 target = (Elf_Addr)target & ~3;
3775 return ((w1 >> 5) & 0x1ffffffffff);
3777 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3781 barf("ia64_extract_instruction: invalid slot %p", target);
3786 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3788 int slot = (Elf_Addr)target & 3;
3789 target = (Elf_Addr)target & ~3;
3794 *target |= value << 5;
3797 *target |= value << 46;
3798 *(target+1) |= value >> 18;
3801 *(target+1) |= value << 23;
3807 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3809 Elf64_Xword instruction;
3810 Elf64_Sxword rel_value;
3812 rel_value = value - gp_val;
3813 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3814 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3816 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3817 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3818 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3819 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3820 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3821 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3825 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3827 Elf64_Xword instruction;
3828 Elf64_Sxword rel_value;
3831 entry = allocatePLTEntry(value, oc);
3833 rel_value = (entry >> 4) - (target >> 4);
3834 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3835 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3837 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3838 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3839 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3840 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3846 * PowerPC & X86_64 ELF specifics
3849 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3851 static int ocAllocateSymbolExtras_ELF( ObjectCode *oc )
3857 ehdr = (Elf_Ehdr *) oc->image;
3858 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3860 for( i = 0; i < ehdr->e_shnum; i++ )
3861 if( shdr[i].sh_type == SHT_SYMTAB )
3864 if( i == ehdr->e_shnum )
3866 errorBelch( "This ELF file contains no symtab" );
3870 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3872 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3873 (int) shdr[i].sh_entsize, (int) sizeof( Elf_Sym ) );
3878 return ocAllocateSymbolExtras( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3881 #endif /* powerpc */
3885 /* --------------------------------------------------------------------------
3887 * ------------------------------------------------------------------------*/
3889 #if defined(OBJFORMAT_MACHO)
3892 Support for MachO linking on Darwin/MacOS X
3893 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3895 I hereby formally apologize for the hackish nature of this code.
3896 Things that need to be done:
3897 *) implement ocVerifyImage_MachO
3898 *) add still more sanity checks.
3901 #if x86_64_HOST_ARCH || powerpc64_HOST_ARCH
3902 #define mach_header mach_header_64
3903 #define segment_command segment_command_64
3904 #define section section_64
3905 #define nlist nlist_64
3908 #ifdef powerpc_HOST_ARCH
3909 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3911 struct mach_header *header = (struct mach_header *) oc->image;
3912 struct load_command *lc = (struct load_command *) (header + 1);
3915 for( i = 0; i < header->ncmds; i++ )
3917 if( lc->cmd == LC_SYMTAB )
3919 // Find out the first and last undefined external
3920 // symbol, so we don't have to allocate too many
3922 struct symtab_command *symLC = (struct symtab_command *) lc;
3923 unsigned min = symLC->nsyms, max = 0;
3924 struct nlist *nlist =
3925 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3927 for(i=0;i<symLC->nsyms;i++)
3929 if(nlist[i].n_type & N_STAB)
3931 else if(nlist[i].n_type & N_EXT)
3933 if((nlist[i].n_type & N_TYPE) == N_UNDF
3934 && (nlist[i].n_value == 0))
3944 return ocAllocateSymbolExtras(oc, max - min + 1, min);
3949 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3951 return ocAllocateSymbolExtras(oc,0,0);
3954 #ifdef x86_64_HOST_ARCH
3955 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3957 struct mach_header *header = (struct mach_header *) oc->image;
3958 struct load_command *lc = (struct load_command *) (header + 1);
3961 for( i = 0; i < header->ncmds; i++ )
3963 if( lc->cmd == LC_SYMTAB )
3965 // Just allocate one entry for every symbol
3966 struct symtab_command *symLC = (struct symtab_command *) lc;
3968 return ocAllocateSymbolExtras(oc, symLC->nsyms, 0);
3971 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3973 return ocAllocateSymbolExtras(oc,0,0);
3977 static int ocVerifyImage_MachO(ObjectCode* oc)
3979 char *image = (char*) oc->image;
3980 struct mach_header *header = (struct mach_header*) image;
3982 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
3983 if(header->magic != MH_MAGIC_64)
3986 if(header->magic != MH_MAGIC)
3989 // FIXME: do some more verifying here
3993 static int resolveImports(
3996 struct symtab_command *symLC,
3997 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3998 unsigned long *indirectSyms,
3999 struct nlist *nlist)
4002 size_t itemSize = 4;
4005 int isJumpTable = 0;
4006 if(!strcmp(sect->sectname,"__jump_table"))
4010 ASSERT(sect->reserved2 == itemSize);
4014 for(i=0; i*itemSize < sect->size;i++)
4016 // according to otool, reserved1 contains the first index into the indirect symbol table
4017 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
4018 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4021 if((symbol->n_type & N_TYPE) == N_UNDF
4022 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
4023 addr = (void*) (symbol->n_value);
4025 addr = lookupSymbol(nm);
4028 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
4036 checkProddableBlock(oc,image + sect->offset + i*itemSize);
4037 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
4038 *(unsigned*)(image + sect->offset + i*itemSize + 1)
4039 = (char*)addr - (image + sect->offset + i*itemSize + 5);
4044 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
4045 ((void**)(image + sect->offset))[i] = addr;
4052 static unsigned long relocateAddress(
4055 struct section* sections,
4056 unsigned long address)
4059 for(i = 0; i < nSections; i++)
4061 if(sections[i].addr <= address
4062 && address < sections[i].addr + sections[i].size)
4064 return (unsigned long)oc->image
4065 + sections[i].offset + address - sections[i].addr;
4068 barf("Invalid Mach-O file:"
4069 "Address out of bounds while relocating object file");
4073 static int relocateSection(
4076 struct symtab_command *symLC, struct nlist *nlist,
4077 int nSections, struct section* sections, struct section *sect)
4079 struct relocation_info *relocs;
4082 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
4084 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
4086 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
4088 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
4092 relocs = (struct relocation_info*) (image + sect->reloff);
4096 #ifdef x86_64_HOST_ARCH
4097 struct relocation_info *reloc = &relocs[i];
4099 char *thingPtr = image + sect->offset + reloc->r_address;
4103 int type = reloc->r_type;
4105 checkProddableBlock(oc,thingPtr);
4106 switch(reloc->r_length)
4109 thing = *(uint8_t*)thingPtr;
4110 baseValue = (uint64_t)thingPtr + 1;
4113 thing = *(uint16_t*)thingPtr;
4114 baseValue = (uint64_t)thingPtr + 2;
4117 thing = *(uint32_t*)thingPtr;
4118 baseValue = (uint64_t)thingPtr + 4;
4121 thing = *(uint64_t*)thingPtr;
4122 baseValue = (uint64_t)thingPtr + 8;
4125 barf("Unknown size.");
4128 if(type == X86_64_RELOC_GOT
4129 || type == X86_64_RELOC_GOT_LOAD)
4131 ASSERT(reloc->r_extern);
4132 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)->addr;
4134 type = X86_64_RELOC_SIGNED;
4136 else if(reloc->r_extern)
4138 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4139 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4140 if(symbol->n_value == 0)
4141 value = (uint64_t) lookupSymbol(nm);
4143 value = relocateAddress(oc, nSections, sections,
4148 value = sections[reloc->r_symbolnum-1].offset
4149 - sections[reloc->r_symbolnum-1].addr
4153 if(type == X86_64_RELOC_BRANCH)
4155 if((int32_t)(value - baseValue) != (int64_t)(value - baseValue))
4157 ASSERT(reloc->r_extern);
4158 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)
4161 ASSERT((int32_t)(value - baseValue) == (int64_t)(value - baseValue));
4162 type = X86_64_RELOC_SIGNED;
4167 case X86_64_RELOC_UNSIGNED:
4168 ASSERT(!reloc->r_pcrel);
4171 case X86_64_RELOC_SIGNED:
4172 ASSERT(reloc->r_pcrel);
4173 thing += value - baseValue;
4175 case X86_64_RELOC_SUBTRACTOR:
4176 ASSERT(!reloc->r_pcrel);
4180 barf("unkown relocation");
4183 switch(reloc->r_length)
4186 *(uint8_t*)thingPtr = thing;
4189 *(uint16_t*)thingPtr = thing;
4192 *(uint32_t*)thingPtr = thing;
4195 *(uint64_t*)thingPtr = thing;
4199 if(relocs[i].r_address & R_SCATTERED)
4201 struct scattered_relocation_info *scat =
4202 (struct scattered_relocation_info*) &relocs[i];
4206 if(scat->r_length == 2)
4208 unsigned long word = 0;
4209 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
4210 checkProddableBlock(oc,wordPtr);
4212 // Note on relocation types:
4213 // i386 uses the GENERIC_RELOC_* types,
4214 // while ppc uses special PPC_RELOC_* types.
4215 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
4216 // in both cases, all others are different.
4217 // Therefore, we use GENERIC_RELOC_VANILLA
4218 // and GENERIC_RELOC_PAIR instead of the PPC variants,
4219 // and use #ifdefs for the other types.
4221 // Step 1: Figure out what the relocated value should be
4222 if(scat->r_type == GENERIC_RELOC_VANILLA)
4224 word = *wordPtr + (unsigned long) relocateAddress(
4231 #ifdef powerpc_HOST_ARCH
4232 else if(scat->r_type == PPC_RELOC_SECTDIFF
4233 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
4234 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
4235 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
4237 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
4240 struct scattered_relocation_info *pair =
4241 (struct scattered_relocation_info*) &relocs[i+1];
4243 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
4244 barf("Invalid Mach-O file: "
4245 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
4247 word = (unsigned long)
4248 (relocateAddress(oc, nSections, sections, scat->r_value)
4249 - relocateAddress(oc, nSections, sections, pair->r_value));
4252 #ifdef powerpc_HOST_ARCH
4253 else if(scat->r_type == PPC_RELOC_HI16
4254 || scat->r_type == PPC_RELOC_LO16
4255 || scat->r_type == PPC_RELOC_HA16
4256 || scat->r_type == PPC_RELOC_LO14)
4257 { // these are generated by label+offset things
4258 struct relocation_info *pair = &relocs[i+1];
4259 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
4260 barf("Invalid Mach-O file: "
4261 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
4263 if(scat->r_type == PPC_RELOC_LO16)
4265 word = ((unsigned short*) wordPtr)[1];
4266 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4268 else if(scat->r_type == PPC_RELOC_LO14)
4270 barf("Unsupported Relocation: PPC_RELOC_LO14");
4271 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
4272 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4274 else if(scat->r_type == PPC_RELOC_HI16)
4276 word = ((unsigned short*) wordPtr)[1] << 16;
4277 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4279 else if(scat->r_type == PPC_RELOC_HA16)
4281 word = ((unsigned short*) wordPtr)[1] << 16;
4282 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4286 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4293 continue; // ignore the others
4295 #ifdef powerpc_HOST_ARCH
4296 if(scat->r_type == GENERIC_RELOC_VANILLA
4297 || scat->r_type == PPC_RELOC_SECTDIFF)
4299 if(scat->r_type == GENERIC_RELOC_VANILLA
4300 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4305 #ifdef powerpc_HOST_ARCH
4306 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4308 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4310 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4312 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4314 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4316 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4317 + ((word & (1<<15)) ? 1 : 0);
4323 continue; // FIXME: I hope it's OK to ignore all the others.
4327 struct relocation_info *reloc = &relocs[i];
4328 if(reloc->r_pcrel && !reloc->r_extern)
4331 if(reloc->r_length == 2)
4333 unsigned long word = 0;
4334 #ifdef powerpc_HOST_ARCH
4335 unsigned long jumpIsland = 0;
4336 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4337 // to avoid warning and to catch
4341 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4342 checkProddableBlock(oc,wordPtr);
4344 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4348 #ifdef powerpc_HOST_ARCH
4349 else if(reloc->r_type == PPC_RELOC_LO16)
4351 word = ((unsigned short*) wordPtr)[1];
4352 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4354 else if(reloc->r_type == PPC_RELOC_HI16)
4356 word = ((unsigned short*) wordPtr)[1] << 16;
4357 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4359 else if(reloc->r_type == PPC_RELOC_HA16)
4361 word = ((unsigned short*) wordPtr)[1] << 16;
4362 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4364 else if(reloc->r_type == PPC_RELOC_BR24)
4367 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4371 if(!reloc->r_extern)
4374 sections[reloc->r_symbolnum-1].offset
4375 - sections[reloc->r_symbolnum-1].addr
4382 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4383 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4384 void *symbolAddress = lookupSymbol(nm);
4387 errorBelch("\nunknown symbol `%s'", nm);
4393 #ifdef powerpc_HOST_ARCH
4394 // In the .o file, this should be a relative jump to NULL
4395 // and we'll change it to a relative jump to the symbol
4396 ASSERT(word + reloc->r_address == 0);
4397 jumpIsland = (unsigned long)
4398 &makeSymbolExtra(oc,
4400 (unsigned long) symbolAddress)
4404 offsetToJumpIsland = word + jumpIsland
4405 - (((long)image) + sect->offset - sect->addr);
4408 word += (unsigned long) symbolAddress
4409 - (((long)image) + sect->offset - sect->addr);
4413 word += (unsigned long) symbolAddress;
4417 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4422 #ifdef powerpc_HOST_ARCH
4423 else if(reloc->r_type == PPC_RELOC_LO16)
4425 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4428 else if(reloc->r_type == PPC_RELOC_HI16)
4430 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4433 else if(reloc->r_type == PPC_RELOC_HA16)
4435 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4436 + ((word & (1<<15)) ? 1 : 0);
4439 else if(reloc->r_type == PPC_RELOC_BR24)
4441 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4443 // The branch offset is too large.
4444 // Therefore, we try to use a jump island.
4447 barf("unconditional relative branch out of range: "
4448 "no jump island available");
4451 word = offsetToJumpIsland;
4452 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4453 barf("unconditional relative branch out of range: "
4454 "jump island out of range");
4456 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4461 barf("\nunknown relocation %d",reloc->r_type);
4469 static int ocGetNames_MachO(ObjectCode* oc)
4471 char *image = (char*) oc->image;
4472 struct mach_header *header = (struct mach_header*) image;
4473 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4474 unsigned i,curSymbol = 0;
4475 struct segment_command *segLC = NULL;
4476 struct section *sections;
4477 struct symtab_command *symLC = NULL;
4478 struct nlist *nlist;
4479 unsigned long commonSize = 0;
4480 char *commonStorage = NULL;
4481 unsigned long commonCounter;
4483 for(i=0;i<header->ncmds;i++)
4485 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4486 segLC = (struct segment_command*) lc;
4487 else if(lc->cmd == LC_SYMTAB)
4488 symLC = (struct symtab_command*) lc;
4489 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4492 sections = (struct section*) (segLC+1);
4493 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4497 barf("ocGetNames_MachO: no segment load command");
4499 for(i=0;i<segLC->nsects;i++)
4501 if(sections[i].size == 0)
4504 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4506 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4507 "ocGetNames_MachO(common symbols)");
4508 sections[i].offset = zeroFillArea - image;
4511 if(!strcmp(sections[i].sectname,"__text"))
4512 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4513 (void*) (image + sections[i].offset),
4514 (void*) (image + sections[i].offset + sections[i].size));
4515 else if(!strcmp(sections[i].sectname,"__const"))
4516 addSection(oc, SECTIONKIND_RWDATA,
4517 (void*) (image + sections[i].offset),
4518 (void*) (image + sections[i].offset + sections[i].size));
4519 else if(!strcmp(sections[i].sectname,"__data"))
4520 addSection(oc, SECTIONKIND_RWDATA,
4521 (void*) (image + sections[i].offset),
4522 (void*) (image + sections[i].offset + sections[i].size));
4523 else if(!strcmp(sections[i].sectname,"__bss")
4524 || !strcmp(sections[i].sectname,"__common"))
4525 addSection(oc, SECTIONKIND_RWDATA,
4526 (void*) (image + sections[i].offset),
4527 (void*) (image + sections[i].offset + sections[i].size));
4529 addProddableBlock(oc, (void*) (image + sections[i].offset),
4533 // count external symbols defined here
4537 for(i=0;i<symLC->nsyms;i++)
4539 if(nlist[i].n_type & N_STAB)
4541 else if(nlist[i].n_type & N_EXT)
4543 if((nlist[i].n_type & N_TYPE) == N_UNDF
4544 && (nlist[i].n_value != 0))
4546 commonSize += nlist[i].n_value;
4549 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4554 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4555 "ocGetNames_MachO(oc->symbols)");
4559 for(i=0;i<symLC->nsyms;i++)
4561 if(nlist[i].n_type & N_STAB)
4563 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4565 if(nlist[i].n_type & N_EXT)
4567 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4568 if((nlist[i].n_desc & N_WEAK_DEF) && lookupSymbol(nm))
4569 ; // weak definition, and we already have a definition
4572 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4574 + sections[nlist[i].n_sect-1].offset
4575 - sections[nlist[i].n_sect-1].addr
4576 + nlist[i].n_value);
4577 oc->symbols[curSymbol++] = nm;
4584 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4585 commonCounter = (unsigned long)commonStorage;
4588 for(i=0;i<symLC->nsyms;i++)
4590 if((nlist[i].n_type & N_TYPE) == N_UNDF
4591 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4593 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4594 unsigned long sz = nlist[i].n_value;
4596 nlist[i].n_value = commonCounter;
4598 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4599 (void*)commonCounter);
4600 oc->symbols[curSymbol++] = nm;
4602 commonCounter += sz;
4609 static int ocResolve_MachO(ObjectCode* oc)
4611 char *image = (char*) oc->image;
4612 struct mach_header *header = (struct mach_header*) image;
4613 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4615 struct segment_command *segLC = NULL;
4616 struct section *sections;
4617 struct symtab_command *symLC = NULL;
4618 struct dysymtab_command *dsymLC = NULL;
4619 struct nlist *nlist;
4621 for(i=0;i<header->ncmds;i++)
4623 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4624 segLC = (struct segment_command*) lc;
4625 else if(lc->cmd == LC_SYMTAB)
4626 symLC = (struct symtab_command*) lc;
4627 else if(lc->cmd == LC_DYSYMTAB)
4628 dsymLC = (struct dysymtab_command*) lc;
4629 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4632 sections = (struct section*) (segLC+1);
4633 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4638 unsigned long *indirectSyms
4639 = (unsigned long*) (image + dsymLC->indirectsymoff);
4641 for(i=0;i<segLC->nsects;i++)
4643 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4644 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4645 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4647 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4650 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4651 || !strcmp(sections[i].sectname,"__pointers"))
4653 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4656 else if(!strcmp(sections[i].sectname,"__jump_table"))
4658 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4664 for(i=0;i<segLC->nsects;i++)
4666 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4670 #if defined (powerpc_HOST_ARCH)
4671 ocFlushInstructionCache( oc );
4677 #ifdef powerpc_HOST_ARCH
4679 * The Mach-O object format uses leading underscores. But not everywhere.
4680 * There is a small number of runtime support functions defined in
4681 * libcc_dynamic.a whose name does not have a leading underscore.
4682 * As a consequence, we can't get their address from C code.
4683 * We have to use inline assembler just to take the address of a function.
4687 static void machoInitSymbolsWithoutUnderscore()
4689 extern void* symbolsWithoutUnderscore[];
4690 void **p = symbolsWithoutUnderscore;
4691 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4693 #undef SymI_NeedsProto
4694 #define SymI_NeedsProto(x) \
4695 __asm__ volatile(".long " # x);
4697 RTS_MACHO_NOUNDERLINE_SYMBOLS
4699 __asm__ volatile(".text");
4701 #undef SymI_NeedsProto
4702 #define SymI_NeedsProto(x) \
4703 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4705 RTS_MACHO_NOUNDERLINE_SYMBOLS
4707 #undef SymI_NeedsProto
4712 * Figure out by how much to shift the entire Mach-O file in memory
4713 * when loading so that its single segment ends up 16-byte-aligned
4715 static int machoGetMisalignment( FILE * f )
4717 struct mach_header header;
4720 fread(&header, sizeof(header), 1, f);
4723 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
4724 if(header.magic != MH_MAGIC_64)
4727 if(header.magic != MH_MAGIC)
4731 misalignment = (header.sizeofcmds + sizeof(header))
4734 return misalignment ? (16 - misalignment) : 0;