1 /* -----------------------------------------------------------------------------
3 * (c) The GHC Team, 2000-2004
7 * ---------------------------------------------------------------------------*/
10 #include "PosixSource.h"
13 /* Linux needs _GNU_SOURCE to get RTLD_DEFAULT from <dlfcn.h> and
14 MREMAP_MAYMOVE from <sys/mman.h>.
25 #include "LinkerInternals.h"
29 #include "RtsTypeable.h"
33 #ifdef HAVE_SYS_TYPES_H
34 #include <sys/types.h>
40 #ifdef HAVE_SYS_STAT_H
44 #if defined(HAVE_DLFCN_H)
48 #if defined(cygwin32_HOST_OS)
53 #ifdef HAVE_SYS_TIME_H
57 #include <sys/fcntl.h>
58 #include <sys/termios.h>
59 #include <sys/utime.h>
60 #include <sys/utsname.h>
64 #if defined(ia64_HOST_ARCH) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
69 #if defined(linux_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
77 #if defined(linux_HOST_OS) || defined(solaris2_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
78 # define OBJFORMAT_ELF
79 #elif defined(cygwin32_HOST_OS) || defined (mingw32_HOST_OS)
80 # define OBJFORMAT_PEi386
83 #elif defined(darwin_HOST_OS)
84 # define OBJFORMAT_MACHO
85 # include <mach-o/loader.h>
86 # include <mach-o/nlist.h>
87 # include <mach-o/reloc.h>
88 #if !defined(HAVE_DLFCN_H)
89 # include <mach-o/dyld.h>
91 #if defined(powerpc_HOST_ARCH)
92 # include <mach-o/ppc/reloc.h>
94 #if defined(x86_64_HOST_ARCH)
95 # include <mach-o/x86_64/reloc.h>
99 /* Hash table mapping symbol names to Symbol */
100 static /*Str*/HashTable *symhash;
102 /* Hash table mapping symbol names to StgStablePtr */
103 static /*Str*/HashTable *stablehash;
105 /* List of currently loaded objects */
106 ObjectCode *objects = NULL; /* initially empty */
108 #if defined(OBJFORMAT_ELF)
109 static int ocVerifyImage_ELF ( ObjectCode* oc );
110 static int ocGetNames_ELF ( ObjectCode* oc );
111 static int ocResolve_ELF ( ObjectCode* oc );
112 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
113 static int ocAllocateSymbolExtras_ELF ( ObjectCode* oc );
115 #elif defined(OBJFORMAT_PEi386)
116 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
117 static int ocGetNames_PEi386 ( ObjectCode* oc );
118 static int ocResolve_PEi386 ( ObjectCode* oc );
119 static void *lookupSymbolInDLLs ( unsigned char *lbl );
120 static void zapTrailingAtSign ( unsigned char *sym );
121 #elif defined(OBJFORMAT_MACHO)
122 static int ocVerifyImage_MachO ( ObjectCode* oc );
123 static int ocGetNames_MachO ( ObjectCode* oc );
124 static int ocResolve_MachO ( ObjectCode* oc );
126 static int machoGetMisalignment( FILE * );
127 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
128 static int ocAllocateSymbolExtras_MachO ( ObjectCode* oc );
130 #ifdef powerpc_HOST_ARCH
131 static void machoInitSymbolsWithoutUnderscore( void );
135 /* on x86_64 we have a problem with relocating symbol references in
136 * code that was compiled without -fPIC. By default, the small memory
137 * model is used, which assumes that symbol references can fit in a
138 * 32-bit slot. The system dynamic linker makes this work for
139 * references to shared libraries by either (a) allocating a jump
140 * table slot for code references, or (b) moving the symbol at load
141 * time (and copying its contents, if necessary) for data references.
143 * We unfortunately can't tell whether symbol references are to code
144 * or data. So for now we assume they are code (the vast majority
145 * are), and allocate jump-table slots. Unfortunately this will
146 * SILENTLY generate crashing code for data references. This hack is
147 * enabled by X86_64_ELF_NONPIC_HACK.
149 * One workaround is to use shared Haskell libraries. This is
150 * coming. Another workaround is to keep the static libraries but
151 * compile them with -fPIC, because that will generate PIC references
152 * to data which can be relocated. The PIC code is still too green to
153 * do this systematically, though.
156 * See thread http://www.haskell.org/pipermail/cvs-ghc/2007-September/038458.html
158 * Naming Scheme for Symbol Macros
160 * SymI_*: symbol is internal to the RTS. It resides in an object
161 * file/library that is statically.
162 * SymE_*: symbol is external to the RTS library. It might be linked
165 * Sym*_HasProto : the symbol prototype is imported in an include file
166 * or defined explicitly
167 * Sym*_NeedsProto: the symbol is undefined and we add a dummy
168 * default proto extern void sym(void);
170 #define X86_64_ELF_NONPIC_HACK 1
172 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
173 * small memory model on this architecture (see gcc docs,
176 * MAP_32BIT not available on OpenBSD/amd64
178 #if defined(x86_64_HOST_ARCH) && defined(MAP_32BIT)
179 #define TRY_MAP_32BIT MAP_32BIT
181 #define TRY_MAP_32BIT 0
185 * Due to the small memory model (see above), on x86_64 we have to map
186 * all our non-PIC object files into the low 2Gb of the address space
187 * (why 2Gb and not 4Gb? Because all addresses must be reachable
188 * using a 32-bit signed PC-relative offset). On Linux we can do this
189 * using the MAP_32BIT flag to mmap(), however on other OSs
190 * (e.g. *BSD, see #2063, and also on Linux inside Xen, see #2512), we
191 * can't do this. So on these systems, we have to pick a base address
192 * in the low 2Gb of the address space and try to allocate memory from
195 * We pick a default address based on the OS, but also make this
196 * configurable via an RTS flag (+RTS -xm)
198 #if defined(x86_64_HOST_ARCH)
200 #if defined(MAP_32BIT)
201 // Try to use MAP_32BIT
202 #define MMAP_32BIT_BASE_DEFAULT 0
205 #define MMAP_32BIT_BASE_DEFAULT 0x40000000
208 static void *mmap_32bit_base = MMAP_32BIT_BASE_DEFAULT;
211 /* MAP_ANONYMOUS is MAP_ANON on some systems, e.g. OpenBSD */
212 #if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
213 #define MAP_ANONYMOUS MAP_ANON
216 /* -----------------------------------------------------------------------------
217 * Built-in symbols from the RTS
220 typedef struct _RtsSymbolVal {
226 #define Maybe_Stable_Names SymI_HasProto(mkWeakzh_fast) \
227 SymI_HasProto(makeStableNamezh_fast) \
228 SymI_HasProto(finalizzeWeakzh_fast)
230 /* These are not available in GUM!!! -- HWL */
231 #define Maybe_Stable_Names
234 #if !defined (mingw32_HOST_OS)
235 #define RTS_POSIX_ONLY_SYMBOLS \
236 SymI_HasProto(shutdownHaskellAndSignal) \
237 SymI_NeedsProto(lockFile) \
238 SymI_NeedsProto(unlockFile) \
239 SymI_HasProto(signal_handlers) \
240 SymI_HasProto(stg_sig_install) \
241 SymI_NeedsProto(nocldstop)
244 #if defined (cygwin32_HOST_OS)
245 #define RTS_MINGW_ONLY_SYMBOLS /**/
246 /* Don't have the ability to read import libs / archives, so
247 * we have to stupidly list a lot of what libcygwin.a
250 #define RTS_CYGWIN_ONLY_SYMBOLS \
251 SymI_HasProto(regfree) \
252 SymI_HasProto(regexec) \
253 SymI_HasProto(regerror) \
254 SymI_HasProto(regcomp) \
255 SymI_HasProto(__errno) \
256 SymI_HasProto(access) \
257 SymI_HasProto(chmod) \
258 SymI_HasProto(chdir) \
259 SymI_HasProto(close) \
260 SymI_HasProto(creat) \
262 SymI_HasProto(dup2) \
263 SymI_HasProto(fstat) \
264 SymI_HasProto(fcntl) \
265 SymI_HasProto(getcwd) \
266 SymI_HasProto(getenv) \
267 SymI_HasProto(lseek) \
268 SymI_HasProto(open) \
269 SymI_HasProto(fpathconf) \
270 SymI_HasProto(pathconf) \
271 SymI_HasProto(stat) \
273 SymI_HasProto(tanh) \
274 SymI_HasProto(cosh) \
275 SymI_HasProto(sinh) \
276 SymI_HasProto(atan) \
277 SymI_HasProto(acos) \
278 SymI_HasProto(asin) \
284 SymI_HasProto(sqrt) \
285 SymI_HasProto(localtime_r) \
286 SymI_HasProto(gmtime_r) \
287 SymI_HasProto(mktime) \
288 SymI_NeedsProto(_imp___tzname) \
289 SymI_HasProto(gettimeofday) \
290 SymI_HasProto(timezone) \
291 SymI_HasProto(tcgetattr) \
292 SymI_HasProto(tcsetattr) \
293 SymI_HasProto(memcpy) \
294 SymI_HasProto(memmove) \
295 SymI_HasProto(realloc) \
296 SymI_HasProto(malloc) \
297 SymI_HasProto(free) \
298 SymI_HasProto(fork) \
299 SymI_HasProto(lstat) \
300 SymI_HasProto(isatty) \
301 SymI_HasProto(mkdir) \
302 SymI_HasProto(opendir) \
303 SymI_HasProto(readdir) \
304 SymI_HasProto(rewinddir) \
305 SymI_HasProto(closedir) \
306 SymI_HasProto(link) \
307 SymI_HasProto(mkfifo) \
308 SymI_HasProto(pipe) \
309 SymI_HasProto(read) \
310 SymI_HasProto(rename) \
311 SymI_HasProto(rmdir) \
312 SymI_HasProto(select) \
313 SymI_HasProto(system) \
314 SymI_HasProto(write) \
315 SymI_HasProto(strcmp) \
316 SymI_HasProto(strcpy) \
317 SymI_HasProto(strncpy) \
318 SymI_HasProto(strerror) \
319 SymI_HasProto(sigaddset) \
320 SymI_HasProto(sigemptyset) \
321 SymI_HasProto(sigprocmask) \
322 SymI_HasProto(umask) \
323 SymI_HasProto(uname) \
324 SymI_HasProto(unlink) \
325 SymI_HasProto(utime) \
326 SymI_HasProto(waitpid)
328 #elif !defined(mingw32_HOST_OS)
329 #define RTS_MINGW_ONLY_SYMBOLS /**/
330 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
331 #else /* defined(mingw32_HOST_OS) */
332 #define RTS_POSIX_ONLY_SYMBOLS /**/
333 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
335 /* Extra syms gen'ed by mingw-2's gcc-3.2: */
337 #define RTS_MINGW_EXTRA_SYMS \
338 SymI_NeedsProto(_imp____mb_cur_max) \
339 SymI_NeedsProto(_imp___pctype)
341 #define RTS_MINGW_EXTRA_SYMS
344 #if HAVE_GETTIMEOFDAY
345 #define RTS_MINGW_GETTIMEOFDAY_SYM SymI_NeedsProto(gettimeofday)
347 #define RTS_MINGW_GETTIMEOFDAY_SYM /**/
350 /* These are statically linked from the mingw libraries into the ghc
351 executable, so we have to employ this hack. */
352 #define RTS_MINGW_ONLY_SYMBOLS \
353 SymI_HasProto(asyncReadzh_fast) \
354 SymI_HasProto(asyncWritezh_fast) \
355 SymI_HasProto(asyncDoProczh_fast) \
356 SymI_HasProto(memset) \
357 SymI_HasProto(inet_ntoa) \
358 SymI_HasProto(inet_addr) \
359 SymI_HasProto(htonl) \
360 SymI_HasProto(recvfrom) \
361 SymI_HasProto(listen) \
362 SymI_HasProto(bind) \
363 SymI_HasProto(shutdown) \
364 SymI_HasProto(connect) \
365 SymI_HasProto(htons) \
366 SymI_HasProto(ntohs) \
367 SymI_HasProto(getservbyname) \
368 SymI_HasProto(getservbyport) \
369 SymI_HasProto(getprotobynumber) \
370 SymI_HasProto(getprotobyname) \
371 SymI_HasProto(gethostbyname) \
372 SymI_HasProto(gethostbyaddr) \
373 SymI_HasProto(gethostname) \
374 SymI_HasProto(strcpy) \
375 SymI_HasProto(strncpy) \
376 SymI_HasProto(abort) \
377 SymI_NeedsProto(_alloca) \
378 SymI_NeedsProto(isxdigit) \
379 SymI_NeedsProto(isupper) \
380 SymI_NeedsProto(ispunct) \
381 SymI_NeedsProto(islower) \
382 SymI_NeedsProto(isspace) \
383 SymI_NeedsProto(isprint) \
384 SymI_NeedsProto(isdigit) \
385 SymI_NeedsProto(iscntrl) \
386 SymI_NeedsProto(isalpha) \
387 SymI_NeedsProto(isalnum) \
388 SymI_HasProto(strcmp) \
389 SymI_HasProto(memmove) \
390 SymI_HasProto(realloc) \
391 SymI_HasProto(malloc) \
393 SymI_HasProto(tanh) \
394 SymI_HasProto(cosh) \
395 SymI_HasProto(sinh) \
396 SymI_HasProto(atan) \
397 SymI_HasProto(acos) \
398 SymI_HasProto(asin) \
404 SymI_HasProto(sqrt) \
405 SymI_HasProto(powf) \
406 SymI_HasProto(tanhf) \
407 SymI_HasProto(coshf) \
408 SymI_HasProto(sinhf) \
409 SymI_HasProto(atanf) \
410 SymI_HasProto(acosf) \
411 SymI_HasProto(asinf) \
412 SymI_HasProto(tanf) \
413 SymI_HasProto(cosf) \
414 SymI_HasProto(sinf) \
415 SymI_HasProto(expf) \
416 SymI_HasProto(logf) \
417 SymI_HasProto(sqrtf) \
418 SymI_HasProto(memcpy) \
419 SymI_HasProto(rts_InstallConsoleEvent) \
420 SymI_HasProto(rts_ConsoleHandlerDone) \
421 SymI_NeedsProto(mktime) \
422 SymI_NeedsProto(_imp___timezone) \
423 SymI_NeedsProto(_imp___tzname) \
424 SymI_NeedsProto(_imp__tzname) \
425 SymI_NeedsProto(_imp___iob) \
426 SymI_NeedsProto(_imp___osver) \
427 SymI_NeedsProto(localtime) \
428 SymI_NeedsProto(gmtime) \
429 SymI_NeedsProto(opendir) \
430 SymI_NeedsProto(readdir) \
431 SymI_NeedsProto(rewinddir) \
432 RTS_MINGW_EXTRA_SYMS \
433 RTS_MINGW_GETTIMEOFDAY_SYM \
434 SymI_NeedsProto(closedir)
437 #if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
438 #define RTS_DARWIN_ONLY_SYMBOLS \
439 SymI_NeedsProto(asprintf$LDBLStub) \
440 SymI_NeedsProto(err$LDBLStub) \
441 SymI_NeedsProto(errc$LDBLStub) \
442 SymI_NeedsProto(errx$LDBLStub) \
443 SymI_NeedsProto(fprintf$LDBLStub) \
444 SymI_NeedsProto(fscanf$LDBLStub) \
445 SymI_NeedsProto(fwprintf$LDBLStub) \
446 SymI_NeedsProto(fwscanf$LDBLStub) \
447 SymI_NeedsProto(printf$LDBLStub) \
448 SymI_NeedsProto(scanf$LDBLStub) \
449 SymI_NeedsProto(snprintf$LDBLStub) \
450 SymI_NeedsProto(sprintf$LDBLStub) \
451 SymI_NeedsProto(sscanf$LDBLStub) \
452 SymI_NeedsProto(strtold$LDBLStub) \
453 SymI_NeedsProto(swprintf$LDBLStub) \
454 SymI_NeedsProto(swscanf$LDBLStub) \
455 SymI_NeedsProto(syslog$LDBLStub) \
456 SymI_NeedsProto(vasprintf$LDBLStub) \
457 SymI_NeedsProto(verr$LDBLStub) \
458 SymI_NeedsProto(verrc$LDBLStub) \
459 SymI_NeedsProto(verrx$LDBLStub) \
460 SymI_NeedsProto(vfprintf$LDBLStub) \
461 SymI_NeedsProto(vfscanf$LDBLStub) \
462 SymI_NeedsProto(vfwprintf$LDBLStub) \
463 SymI_NeedsProto(vfwscanf$LDBLStub) \
464 SymI_NeedsProto(vprintf$LDBLStub) \
465 SymI_NeedsProto(vscanf$LDBLStub) \
466 SymI_NeedsProto(vsnprintf$LDBLStub) \
467 SymI_NeedsProto(vsprintf$LDBLStub) \
468 SymI_NeedsProto(vsscanf$LDBLStub) \
469 SymI_NeedsProto(vswprintf$LDBLStub) \
470 SymI_NeedsProto(vswscanf$LDBLStub) \
471 SymI_NeedsProto(vsyslog$LDBLStub) \
472 SymI_NeedsProto(vwarn$LDBLStub) \
473 SymI_NeedsProto(vwarnc$LDBLStub) \
474 SymI_NeedsProto(vwarnx$LDBLStub) \
475 SymI_NeedsProto(vwprintf$LDBLStub) \
476 SymI_NeedsProto(vwscanf$LDBLStub) \
477 SymI_NeedsProto(warn$LDBLStub) \
478 SymI_NeedsProto(warnc$LDBLStub) \
479 SymI_NeedsProto(warnx$LDBLStub) \
480 SymI_NeedsProto(wcstold$LDBLStub) \
481 SymI_NeedsProto(wprintf$LDBLStub) \
482 SymI_NeedsProto(wscanf$LDBLStub)
484 #define RTS_DARWIN_ONLY_SYMBOLS
488 # define MAIN_CAP_SYM SymI_HasProto(MainCapability)
490 # define MAIN_CAP_SYM
493 #if !defined(mingw32_HOST_OS)
494 #define RTS_USER_SIGNALS_SYMBOLS \
495 SymI_HasProto(setIOManagerPipe)
497 #define RTS_USER_SIGNALS_SYMBOLS \
498 SymI_HasProto(sendIOManagerEvent) \
499 SymI_HasProto(readIOManagerEvent) \
500 SymI_HasProto(getIOManagerEvent) \
501 SymI_HasProto(console_handler)
504 #define RTS_LIBFFI_SYMBOLS \
505 SymE_NeedsProto(ffi_prep_cif) \
506 SymE_NeedsProto(ffi_call) \
507 SymE_NeedsProto(ffi_type_void) \
508 SymE_NeedsProto(ffi_type_float) \
509 SymE_NeedsProto(ffi_type_double) \
510 SymE_NeedsProto(ffi_type_sint64) \
511 SymE_NeedsProto(ffi_type_uint64) \
512 SymE_NeedsProto(ffi_type_sint32) \
513 SymE_NeedsProto(ffi_type_uint32) \
514 SymE_NeedsProto(ffi_type_sint16) \
515 SymE_NeedsProto(ffi_type_uint16) \
516 SymE_NeedsProto(ffi_type_sint8) \
517 SymE_NeedsProto(ffi_type_uint8) \
518 SymE_NeedsProto(ffi_type_pointer)
520 #ifdef TABLES_NEXT_TO_CODE
521 #define RTS_RET_SYMBOLS /* nothing */
523 #define RTS_RET_SYMBOLS \
524 SymI_HasProto(stg_enter_ret) \
525 SymI_HasProto(stg_gc_fun_ret) \
526 SymI_HasProto(stg_ap_v_ret) \
527 SymI_HasProto(stg_ap_f_ret) \
528 SymI_HasProto(stg_ap_d_ret) \
529 SymI_HasProto(stg_ap_l_ret) \
530 SymI_HasProto(stg_ap_n_ret) \
531 SymI_HasProto(stg_ap_p_ret) \
532 SymI_HasProto(stg_ap_pv_ret) \
533 SymI_HasProto(stg_ap_pp_ret) \
534 SymI_HasProto(stg_ap_ppv_ret) \
535 SymI_HasProto(stg_ap_ppp_ret) \
536 SymI_HasProto(stg_ap_pppv_ret) \
537 SymI_HasProto(stg_ap_pppp_ret) \
538 SymI_HasProto(stg_ap_ppppp_ret) \
539 SymI_HasProto(stg_ap_pppppp_ret)
542 /* On Windows, we link libgmp.a statically into libHSrts.dll */
543 #ifdef mingw32_HOST_OS
545 SymI_HasProto(__gmpz_cmp) \
546 SymI_HasProto(__gmpz_cmp_si) \
547 SymI_HasProto(__gmpz_cmp_ui) \
548 SymI_HasProto(__gmpz_get_si) \
549 SymI_HasProto(__gmpz_get_ui)
552 SymE_HasProto(__gmpz_cmp) \
553 SymE_HasProto(__gmpz_cmp_si) \
554 SymE_HasProto(__gmpz_cmp_ui) \
555 SymE_HasProto(__gmpz_get_si) \
556 SymE_HasProto(__gmpz_get_ui)
559 #define RTS_SYMBOLS \
561 SymI_HasProto(StgReturn) \
562 SymI_HasProto(stg_enter_info) \
563 SymI_HasProto(stg_gc_void_info) \
564 SymI_HasProto(__stg_gc_enter_1) \
565 SymI_HasProto(stg_gc_noregs) \
566 SymI_HasProto(stg_gc_unpt_r1_info) \
567 SymI_HasProto(stg_gc_unpt_r1) \
568 SymI_HasProto(stg_gc_unbx_r1_info) \
569 SymI_HasProto(stg_gc_unbx_r1) \
570 SymI_HasProto(stg_gc_f1_info) \
571 SymI_HasProto(stg_gc_f1) \
572 SymI_HasProto(stg_gc_d1_info) \
573 SymI_HasProto(stg_gc_d1) \
574 SymI_HasProto(stg_gc_l1_info) \
575 SymI_HasProto(stg_gc_l1) \
576 SymI_HasProto(__stg_gc_fun) \
577 SymI_HasProto(stg_gc_fun_info) \
578 SymI_HasProto(stg_gc_gen) \
579 SymI_HasProto(stg_gc_gen_info) \
580 SymI_HasProto(stg_gc_gen_hp) \
581 SymI_HasProto(stg_gc_ut) \
582 SymI_HasProto(stg_gen_yield) \
583 SymI_HasProto(stg_yield_noregs) \
584 SymI_HasProto(stg_yield_to_interpreter) \
585 SymI_HasProto(stg_gen_block) \
586 SymI_HasProto(stg_block_noregs) \
587 SymI_HasProto(stg_block_1) \
588 SymI_HasProto(stg_block_takemvar) \
589 SymI_HasProto(stg_block_putmvar) \
591 SymI_HasProto(MallocFailHook) \
592 SymI_HasProto(OnExitHook) \
593 SymI_HasProto(OutOfHeapHook) \
594 SymI_HasProto(StackOverflowHook) \
595 SymI_HasProto(__encodeDouble) \
596 SymI_HasProto(__encodeFloat) \
597 SymI_HasProto(addDLL) \
599 SymI_HasProto(__int_encodeDouble) \
600 SymI_HasProto(__word_encodeDouble) \
601 SymI_HasProto(__2Int_encodeDouble) \
602 SymI_HasProto(__int_encodeFloat) \
603 SymI_HasProto(__word_encodeFloat) \
604 SymI_HasProto(andIntegerzh_fast) \
605 SymI_HasProto(atomicallyzh_fast) \
606 SymI_HasProto(barf) \
607 SymI_HasProto(debugBelch) \
608 SymI_HasProto(errorBelch) \
609 SymI_HasProto(asyncExceptionsBlockedzh_fast) \
610 SymI_HasProto(blockAsyncExceptionszh_fast) \
611 SymI_HasProto(catchzh_fast) \
612 SymI_HasProto(catchRetryzh_fast) \
613 SymI_HasProto(catchSTMzh_fast) \
614 SymI_HasProto(checkzh_fast) \
615 SymI_HasProto(closure_flags) \
616 SymI_HasProto(cmp_thread) \
617 SymI_HasProto(cmpIntegerzh_fast) \
618 SymI_HasProto(cmpIntegerIntzh_fast) \
619 SymI_HasProto(complementIntegerzh_fast) \
620 SymI_HasProto(createAdjustor) \
621 SymI_HasProto(decodeDoublezh_fast) \
622 SymI_HasProto(decodeFloatzh_fast) \
623 SymI_HasProto(decodeDoublezu2Intzh_fast) \
624 SymI_HasProto(decodeFloatzuIntzh_fast) \
625 SymI_HasProto(defaultsHook) \
626 SymI_HasProto(delayzh_fast) \
627 SymI_HasProto(deRefWeakzh_fast) \
628 SymI_HasProto(deRefStablePtrzh_fast) \
629 SymI_HasProto(dirty_MUT_VAR) \
630 SymI_HasProto(divExactIntegerzh_fast) \
631 SymI_HasProto(divModIntegerzh_fast) \
632 SymI_HasProto(forkzh_fast) \
633 SymI_HasProto(forkOnzh_fast) \
634 SymI_HasProto(forkProcess) \
635 SymI_HasProto(forkOS_createThread) \
636 SymI_HasProto(freeHaskellFunctionPtr) \
637 SymI_HasProto(freeStablePtr) \
638 SymI_HasProto(getOrSetTypeableStore) \
639 SymI_HasProto(gcdIntegerzh_fast) \
640 SymI_HasProto(gcdIntegerIntzh_fast) \
641 SymI_HasProto(gcdIntzh_fast) \
642 SymI_HasProto(genSymZh) \
643 SymI_HasProto(genericRaise) \
644 SymI_HasProto(getProgArgv) \
645 SymI_HasProto(getFullProgArgv) \
646 SymI_HasProto(getStablePtr) \
647 SymI_HasProto(hs_init) \
648 SymI_HasProto(hs_exit) \
649 SymI_HasProto(hs_set_argv) \
650 SymI_HasProto(hs_add_root) \
651 SymI_HasProto(hs_perform_gc) \
652 SymI_HasProto(hs_free_stable_ptr) \
653 SymI_HasProto(hs_free_fun_ptr) \
654 SymI_HasProto(hs_hpc_rootModule) \
655 SymI_HasProto(initLinker) \
656 SymI_HasProto(unpackClosurezh_fast) \
657 SymI_HasProto(getApStackValzh_fast) \
658 SymI_HasProto(getSparkzh_fast) \
659 SymI_HasProto(int2Integerzh_fast) \
660 SymI_HasProto(integer2Intzh_fast) \
661 SymI_HasProto(integer2Wordzh_fast) \
662 SymI_HasProto(isCurrentThreadBoundzh_fast) \
663 SymI_HasProto(isDoubleDenormalized) \
664 SymI_HasProto(isDoubleInfinite) \
665 SymI_HasProto(isDoubleNaN) \
666 SymI_HasProto(isDoubleNegativeZero) \
667 SymI_HasProto(isEmptyMVarzh_fast) \
668 SymI_HasProto(isFloatDenormalized) \
669 SymI_HasProto(isFloatInfinite) \
670 SymI_HasProto(isFloatNaN) \
671 SymI_HasProto(isFloatNegativeZero) \
672 SymI_HasProto(killThreadzh_fast) \
673 SymI_HasProto(loadObj) \
674 SymI_HasProto(insertStableSymbol) \
675 SymI_HasProto(insertSymbol) \
676 SymI_HasProto(lookupSymbol) \
677 SymI_HasProto(makeStablePtrzh_fast) \
678 SymI_HasProto(minusIntegerzh_fast) \
679 SymI_HasProto(mkApUpd0zh_fast) \
680 SymI_HasProto(myThreadIdzh_fast) \
681 SymI_HasProto(labelThreadzh_fast) \
682 SymI_HasProto(newArrayzh_fast) \
683 SymI_HasProto(newBCOzh_fast) \
684 SymI_HasProto(newByteArrayzh_fast) \
685 SymI_HasProto_redirect(newCAF, newDynCAF) \
686 SymI_HasProto(newMVarzh_fast) \
687 SymI_HasProto(newMutVarzh_fast) \
688 SymI_HasProto(newTVarzh_fast) \
689 SymI_HasProto(noDuplicatezh_fast) \
690 SymI_HasProto(atomicModifyMutVarzh_fast) \
691 SymI_HasProto(newPinnedByteArrayzh_fast) \
692 SymI_HasProto(newSpark) \
693 SymI_HasProto(orIntegerzh_fast) \
694 SymI_HasProto(performGC) \
695 SymI_HasProto(performMajorGC) \
696 SymI_HasProto(plusIntegerzh_fast) \
697 SymI_HasProto(prog_argc) \
698 SymI_HasProto(prog_argv) \
699 SymI_HasProto(putMVarzh_fast) \
700 SymI_HasProto(quotIntegerzh_fast) \
701 SymI_HasProto(quotRemIntegerzh_fast) \
702 SymI_HasProto(raisezh_fast) \
703 SymI_HasProto(raiseIOzh_fast) \
704 SymI_HasProto(readTVarzh_fast) \
705 SymI_HasProto(readTVarIOzh_fast) \
706 SymI_HasProto(remIntegerzh_fast) \
707 SymI_HasProto(resetNonBlockingFd) \
708 SymI_HasProto(resumeThread) \
709 SymI_HasProto(resolveObjs) \
710 SymI_HasProto(retryzh_fast) \
711 SymI_HasProto(rts_apply) \
712 SymI_HasProto(rts_checkSchedStatus) \
713 SymI_HasProto(rts_eval) \
714 SymI_HasProto(rts_evalIO) \
715 SymI_HasProto(rts_evalLazyIO) \
716 SymI_HasProto(rts_evalStableIO) \
717 SymI_HasProto(rts_eval_) \
718 SymI_HasProto(rts_getBool) \
719 SymI_HasProto(rts_getChar) \
720 SymI_HasProto(rts_getDouble) \
721 SymI_HasProto(rts_getFloat) \
722 SymI_HasProto(rts_getInt) \
723 SymI_HasProto(rts_getInt8) \
724 SymI_HasProto(rts_getInt16) \
725 SymI_HasProto(rts_getInt32) \
726 SymI_HasProto(rts_getInt64) \
727 SymI_HasProto(rts_getPtr) \
728 SymI_HasProto(rts_getFunPtr) \
729 SymI_HasProto(rts_getStablePtr) \
730 SymI_HasProto(rts_getThreadId) \
731 SymI_HasProto(rts_getWord) \
732 SymI_HasProto(rts_getWord8) \
733 SymI_HasProto(rts_getWord16) \
734 SymI_HasProto(rts_getWord32) \
735 SymI_HasProto(rts_getWord64) \
736 SymI_HasProto(rts_lock) \
737 SymI_HasProto(rts_mkBool) \
738 SymI_HasProto(rts_mkChar) \
739 SymI_HasProto(rts_mkDouble) \
740 SymI_HasProto(rts_mkFloat) \
741 SymI_HasProto(rts_mkInt) \
742 SymI_HasProto(rts_mkInt8) \
743 SymI_HasProto(rts_mkInt16) \
744 SymI_HasProto(rts_mkInt32) \
745 SymI_HasProto(rts_mkInt64) \
746 SymI_HasProto(rts_mkPtr) \
747 SymI_HasProto(rts_mkFunPtr) \
748 SymI_HasProto(rts_mkStablePtr) \
749 SymI_HasProto(rts_mkString) \
750 SymI_HasProto(rts_mkWord) \
751 SymI_HasProto(rts_mkWord8) \
752 SymI_HasProto(rts_mkWord16) \
753 SymI_HasProto(rts_mkWord32) \
754 SymI_HasProto(rts_mkWord64) \
755 SymI_HasProto(rts_unlock) \
756 SymI_HasProto(rtsSupportsBoundThreads) \
757 SymI_HasProto(__hscore_get_saved_termios) \
758 SymI_HasProto(__hscore_set_saved_termios) \
759 SymI_HasProto(setProgArgv) \
760 SymI_HasProto(startupHaskell) \
761 SymI_HasProto(shutdownHaskell) \
762 SymI_HasProto(shutdownHaskellAndExit) \
763 SymI_HasProto(stable_ptr_table) \
764 SymI_HasProto(stackOverflow) \
765 SymI_HasProto(stg_CAF_BLACKHOLE_info) \
766 SymI_HasProto(awakenBlockedQueue) \
767 SymI_HasProto(startTimer) \
768 SymI_HasProto(stg_CHARLIKE_closure) \
769 SymI_HasProto(stg_MVAR_CLEAN_info) \
770 SymI_HasProto(stg_MVAR_DIRTY_info) \
771 SymI_HasProto(stg_IND_STATIC_info) \
772 SymI_HasProto(stg_INTLIKE_closure) \
773 SymI_HasProto(stg_MUT_ARR_PTRS_DIRTY_info) \
774 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN_info) \
775 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN0_info) \
776 SymI_HasProto(stg_WEAK_info) \
777 SymI_HasProto(stg_ap_v_info) \
778 SymI_HasProto(stg_ap_f_info) \
779 SymI_HasProto(stg_ap_d_info) \
780 SymI_HasProto(stg_ap_l_info) \
781 SymI_HasProto(stg_ap_n_info) \
782 SymI_HasProto(stg_ap_p_info) \
783 SymI_HasProto(stg_ap_pv_info) \
784 SymI_HasProto(stg_ap_pp_info) \
785 SymI_HasProto(stg_ap_ppv_info) \
786 SymI_HasProto(stg_ap_ppp_info) \
787 SymI_HasProto(stg_ap_pppv_info) \
788 SymI_HasProto(stg_ap_pppp_info) \
789 SymI_HasProto(stg_ap_ppppp_info) \
790 SymI_HasProto(stg_ap_pppppp_info) \
791 SymI_HasProto(stg_ap_0_fast) \
792 SymI_HasProto(stg_ap_v_fast) \
793 SymI_HasProto(stg_ap_f_fast) \
794 SymI_HasProto(stg_ap_d_fast) \
795 SymI_HasProto(stg_ap_l_fast) \
796 SymI_HasProto(stg_ap_n_fast) \
797 SymI_HasProto(stg_ap_p_fast) \
798 SymI_HasProto(stg_ap_pv_fast) \
799 SymI_HasProto(stg_ap_pp_fast) \
800 SymI_HasProto(stg_ap_ppv_fast) \
801 SymI_HasProto(stg_ap_ppp_fast) \
802 SymI_HasProto(stg_ap_pppv_fast) \
803 SymI_HasProto(stg_ap_pppp_fast) \
804 SymI_HasProto(stg_ap_ppppp_fast) \
805 SymI_HasProto(stg_ap_pppppp_fast) \
806 SymI_HasProto(stg_ap_1_upd_info) \
807 SymI_HasProto(stg_ap_2_upd_info) \
808 SymI_HasProto(stg_ap_3_upd_info) \
809 SymI_HasProto(stg_ap_4_upd_info) \
810 SymI_HasProto(stg_ap_5_upd_info) \
811 SymI_HasProto(stg_ap_6_upd_info) \
812 SymI_HasProto(stg_ap_7_upd_info) \
813 SymI_HasProto(stg_exit) \
814 SymI_HasProto(stg_sel_0_upd_info) \
815 SymI_HasProto(stg_sel_10_upd_info) \
816 SymI_HasProto(stg_sel_11_upd_info) \
817 SymI_HasProto(stg_sel_12_upd_info) \
818 SymI_HasProto(stg_sel_13_upd_info) \
819 SymI_HasProto(stg_sel_14_upd_info) \
820 SymI_HasProto(stg_sel_15_upd_info) \
821 SymI_HasProto(stg_sel_1_upd_info) \
822 SymI_HasProto(stg_sel_2_upd_info) \
823 SymI_HasProto(stg_sel_3_upd_info) \
824 SymI_HasProto(stg_sel_4_upd_info) \
825 SymI_HasProto(stg_sel_5_upd_info) \
826 SymI_HasProto(stg_sel_6_upd_info) \
827 SymI_HasProto(stg_sel_7_upd_info) \
828 SymI_HasProto(stg_sel_8_upd_info) \
829 SymI_HasProto(stg_sel_9_upd_info) \
830 SymI_HasProto(stg_upd_frame_info) \
831 SymI_HasProto(suspendThread) \
832 SymI_HasProto(takeMVarzh_fast) \
833 SymI_HasProto(threadStatuszh_fast) \
834 SymI_HasProto(timesIntegerzh_fast) \
835 SymI_HasProto(tryPutMVarzh_fast) \
836 SymI_HasProto(tryTakeMVarzh_fast) \
837 SymI_HasProto(unblockAsyncExceptionszh_fast) \
838 SymI_HasProto(unloadObj) \
839 SymI_HasProto(unsafeThawArrayzh_fast) \
840 SymI_HasProto(waitReadzh_fast) \
841 SymI_HasProto(waitWritezh_fast) \
842 SymI_HasProto(word2Integerzh_fast) \
843 SymI_HasProto(writeTVarzh_fast) \
844 SymI_HasProto(xorIntegerzh_fast) \
845 SymI_HasProto(yieldzh_fast) \
846 SymI_NeedsProto(stg_interp_constr_entry) \
847 SymI_HasProto(allocateExec) \
848 SymI_HasProto(freeExec) \
849 SymI_HasProto(getAllocations) \
850 SymI_HasProto(revertCAFs) \
851 SymI_HasProto(RtsFlags) \
852 SymI_NeedsProto(rts_breakpoint_io_action) \
853 SymI_NeedsProto(rts_stop_next_breakpoint) \
854 SymI_NeedsProto(rts_stop_on_exception) \
855 SymI_HasProto(stopTimer) \
856 SymI_HasProto(n_capabilities) \
857 RTS_USER_SIGNALS_SYMBOLS
859 #ifdef SUPPORT_LONG_LONGS
860 #define RTS_LONG_LONG_SYMS \
861 SymI_HasProto(int64ToIntegerzh_fast) \
862 SymI_HasProto(word64ToIntegerzh_fast)
864 #define RTS_LONG_LONG_SYMS /* nothing */
867 // 64-bit support functions in libgcc.a
868 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
869 #define RTS_LIBGCC_SYMBOLS \
870 SymI_NeedsProto(__divdi3) \
871 SymI_NeedsProto(__udivdi3) \
872 SymI_NeedsProto(__moddi3) \
873 SymI_NeedsProto(__umoddi3) \
874 SymI_NeedsProto(__muldi3) \
875 SymI_NeedsProto(__ashldi3) \
876 SymI_NeedsProto(__ashrdi3) \
877 SymI_NeedsProto(__lshrdi3) \
878 SymI_NeedsProto(__eprintf)
879 #elif defined(ia64_HOST_ARCH)
880 #define RTS_LIBGCC_SYMBOLS \
881 SymI_NeedsProto(__divdi3) \
882 SymI_NeedsProto(__udivdi3) \
883 SymI_NeedsProto(__moddi3) \
884 SymI_NeedsProto(__umoddi3) \
885 SymI_NeedsProto(__divsf3) \
886 SymI_NeedsProto(__divdf3)
888 #define RTS_LIBGCC_SYMBOLS
891 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
892 // Symbols that don't have a leading underscore
893 // on Mac OS X. They have to receive special treatment,
894 // see machoInitSymbolsWithoutUnderscore()
895 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
896 SymI_NeedsProto(saveFP) \
897 SymI_NeedsProto(restFP)
900 /* entirely bogus claims about types of these symbols */
901 #define SymI_NeedsProto(vvv) extern void vvv(void);
902 #if defined(__PIC__) && defined(mingw32_TARGET_OS)
903 #define SymE_HasProto(vvv) SymE_HasProto(vvv);
904 #define SymE_NeedsProto(vvv) extern void _imp__ ## vvv (void);
906 #define SymE_NeedsProto(vvv) SymI_NeedsProto(vvv);
907 #define SymE_HasProto(vvv) SymI_HasProto(vvv)
909 #define SymI_HasProto(vvv) /**/
910 #define SymI_HasProto_redirect(vvv,xxx) /**/
914 RTS_POSIX_ONLY_SYMBOLS
915 RTS_MINGW_ONLY_SYMBOLS
916 RTS_CYGWIN_ONLY_SYMBOLS
917 RTS_DARWIN_ONLY_SYMBOLS
920 #undef SymI_NeedsProto
922 #undef SymI_HasProto_redirect
924 #undef SymE_NeedsProto
926 #ifdef LEADING_UNDERSCORE
927 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
929 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
932 #define SymI_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
934 #define SymE_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
935 (void*)DLL_IMPORT_DATA_REF(vvv) },
937 #define SymI_NeedsProto(vvv) SymI_HasProto(vvv)
938 #define SymE_NeedsProto(vvv) SymE_HasProto(vvv)
940 // SymI_HasProto_redirect allows us to redirect references to one symbol to
941 // another symbol. See newCAF/newDynCAF for an example.
942 #define SymI_HasProto_redirect(vvv,xxx) \
943 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
946 static RtsSymbolVal rtsSyms[] = {
950 RTS_POSIX_ONLY_SYMBOLS
951 RTS_MINGW_ONLY_SYMBOLS
952 RTS_CYGWIN_ONLY_SYMBOLS
953 RTS_DARWIN_ONLY_SYMBOLS
956 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
957 // dyld stub code contains references to this,
958 // but it should never be called because we treat
959 // lazy pointers as nonlazy.
960 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
962 { 0, 0 } /* sentinel */
967 /* -----------------------------------------------------------------------------
968 * Insert symbols into hash tables, checking for duplicates.
971 static void ghciInsertStrHashTable ( char* obj_name,
977 if (lookupHashTable(table, (StgWord)key) == NULL)
979 insertStrHashTable(table, (StgWord)key, data);
984 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
986 "whilst processing object file\n"
988 "This could be caused by:\n"
989 " * Loading two different object files which export the same symbol\n"
990 " * Specifying the same object file twice on the GHCi command line\n"
991 " * An incorrect `package.conf' entry, causing some object to be\n"
993 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
1000 /* -----------------------------------------------------------------------------
1001 * initialize the object linker
1005 static int linker_init_done = 0 ;
1007 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1008 static void *dl_prog_handle;
1016 /* Make initLinker idempotent, so we can call it
1017 before evey relevant operation; that means we
1018 don't need to initialise the linker separately */
1019 if (linker_init_done == 1) { return; } else {
1020 linker_init_done = 1;
1023 stablehash = allocStrHashTable();
1024 symhash = allocStrHashTable();
1026 /* populate the symbol table with stuff from the RTS */
1027 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
1028 ghciInsertStrHashTable("(GHCi built-in symbols)",
1029 symhash, sym->lbl, sym->addr);
1031 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1032 machoInitSymbolsWithoutUnderscore();
1035 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1036 # if defined(RTLD_DEFAULT)
1037 dl_prog_handle = RTLD_DEFAULT;
1039 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
1040 # endif /* RTLD_DEFAULT */
1043 #if defined(x86_64_HOST_ARCH)
1044 if (RtsFlags.MiscFlags.linkerMemBase != 0) {
1045 // User-override for mmap_32bit_base
1046 mmap_32bit_base = (void*)RtsFlags.MiscFlags.linkerMemBase;
1051 /* -----------------------------------------------------------------------------
1052 * Loading DLL or .so dynamic libraries
1053 * -----------------------------------------------------------------------------
1055 * Add a DLL from which symbols may be found. In the ELF case, just
1056 * do RTLD_GLOBAL-style add, so no further messing around needs to
1057 * happen in order that symbols in the loaded .so are findable --
1058 * lookupSymbol() will subsequently see them by dlsym on the program's
1059 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
1061 * In the PEi386 case, open the DLLs and put handles to them in a
1062 * linked list. When looking for a symbol, try all handles in the
1063 * list. This means that we need to load even DLLs that are guaranteed
1064 * to be in the ghc.exe image already, just so we can get a handle
1065 * to give to loadSymbol, so that we can find the symbols. For such
1066 * libraries, the LoadLibrary call should be a no-op except for returning
1071 #if defined(OBJFORMAT_PEi386)
1072 /* A record for storing handles into DLLs. */
1077 struct _OpenedDLL* next;
1082 /* A list thereof. */
1083 static OpenedDLL* opened_dlls = NULL;
1087 addDLL( char *dll_name )
1089 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1090 /* ------------------- ELF DLL loader ------------------- */
1096 // omitted: RTLD_NOW
1097 // see http://www.haskell.org/pipermail/cvs-ghc/2007-September/038570.html
1098 hdl= dlopen(dll_name, RTLD_LAZY | RTLD_GLOBAL);
1101 /* dlopen failed; return a ptr to the error msg. */
1103 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1110 # elif defined(OBJFORMAT_PEi386)
1111 /* ------------------- Win32 DLL loader ------------------- */
1119 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1121 /* See if we've already got it, and ignore if so. */
1122 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1123 if (0 == strcmp(o_dll->name, dll_name))
1127 /* The file name has no suffix (yet) so that we can try
1128 both foo.dll and foo.drv
1130 The documentation for LoadLibrary says:
1131 If no file name extension is specified in the lpFileName
1132 parameter, the default library extension .dll is
1133 appended. However, the file name string can include a trailing
1134 point character (.) to indicate that the module name has no
1137 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1138 sprintf(buf, "%s.DLL", dll_name);
1139 instance = LoadLibrary(buf);
1140 if (instance == NULL) {
1141 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1142 // KAA: allow loading of drivers (like winspool.drv)
1143 sprintf(buf, "%s.DRV", dll_name);
1144 instance = LoadLibrary(buf);
1145 if (instance == NULL) {
1146 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1147 // #1883: allow loading of unix-style libfoo.dll DLLs
1148 sprintf(buf, "lib%s.DLL", dll_name);
1149 instance = LoadLibrary(buf);
1150 if (instance == NULL) {
1157 /* Add this DLL to the list of DLLs in which to search for symbols. */
1158 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1159 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1160 strcpy(o_dll->name, dll_name);
1161 o_dll->instance = instance;
1162 o_dll->next = opened_dlls;
1163 opened_dlls = o_dll;
1169 sysErrorBelch(dll_name);
1171 /* LoadLibrary failed; return a ptr to the error msg. */
1172 return "addDLL: could not load DLL";
1175 barf("addDLL: not implemented on this platform");
1179 /* -----------------------------------------------------------------------------
1180 * insert a stable symbol in the hash table
1184 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1186 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1190 /* -----------------------------------------------------------------------------
1191 * insert a symbol in the hash table
1194 insertSymbol(char* obj_name, char* key, void* data)
1196 ghciInsertStrHashTable(obj_name, symhash, key, data);
1199 /* -----------------------------------------------------------------------------
1200 * lookup a symbol in the hash table
1203 lookupSymbol( char *lbl )
1207 ASSERT(symhash != NULL);
1208 val = lookupStrHashTable(symhash, lbl);
1211 # if defined(OBJFORMAT_ELF)
1212 return dlsym(dl_prog_handle, lbl);
1213 # elif defined(OBJFORMAT_MACHO)
1215 /* On OS X 10.3 and later, we use dlsym instead of the old legacy
1218 HACK: On OS X, global symbols are prefixed with an underscore.
1219 However, dlsym wants us to omit the leading underscore from the
1220 symbol name. For now, we simply strip it off here (and ONLY
1223 ASSERT(lbl[0] == '_');
1224 return dlsym(dl_prog_handle, lbl+1);
1226 if(NSIsSymbolNameDefined(lbl)) {
1227 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1228 return NSAddressOfSymbol(symbol);
1232 # endif /* HAVE_DLFCN_H */
1233 # elif defined(OBJFORMAT_PEi386)
1236 sym = lookupSymbolInDLLs(lbl);
1237 if (sym != NULL) { return sym; };
1239 // Also try looking up the symbol without the @N suffix. Some
1240 // DLLs have the suffixes on their symbols, some don't.
1241 zapTrailingAtSign ( lbl );
1242 sym = lookupSymbolInDLLs(lbl);
1243 if (sym != NULL) { return sym; };
1255 /* -----------------------------------------------------------------------------
1256 * Debugging aid: look in GHCi's object symbol tables for symbols
1257 * within DELTA bytes of the specified address, and show their names.
1260 void ghci_enquire ( char* addr );
1262 void ghci_enquire ( char* addr )
1267 const int DELTA = 64;
1272 for (oc = objects; oc; oc = oc->next) {
1273 for (i = 0; i < oc->n_symbols; i++) {
1274 sym = oc->symbols[i];
1275 if (sym == NULL) continue;
1278 a = lookupStrHashTable(symhash, sym);
1281 // debugBelch("ghci_enquire: can't find %s\n", sym);
1283 else if (addr-DELTA <= a && a <= addr+DELTA) {
1284 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1291 #ifdef ia64_HOST_ARCH
1292 static unsigned int PLTSize(void);
1296 mmapForLinker (size_t bytes, nat flags, int fd)
1298 void *map_addr = NULL;
1303 #if defined(x86_64_HOST_ARCH)
1304 if (mmap_32bit_base != 0) {
1305 map_addr = mmap_32bit_base;
1309 result = mmap(map_addr, bytes, PROT_EXEC|PROT_READ|PROT_WRITE,
1310 MAP_PRIVATE|TRY_MAP_32BIT|flags, fd, 0);
1312 if (result == MAP_FAILED) {
1313 sysErrorBelch("mmap");
1314 stg_exit(EXIT_FAILURE);
1317 #if defined(x86_64_HOST_ARCH)
1318 if (mmap_32bit_base != 0) {
1319 if (result == map_addr) {
1320 mmap_32bit_base = map_addr + bytes;
1322 if ((W_)result > 0x80000000) {
1323 // oops, we were given memory over 2Gb
1324 // ... try allocating memory somewhere else?;
1325 barf("loadObj: failed to mmap() memory below 2Gb; asked for %lu bytes at 0x%p, got 0x%p. Try specifying an address with +RTS -xm<addr> -RTS", bytes, map_addr, result);
1327 // hmm, we were given memory somewhere else, but it's
1328 // still under 2Gb so we can use it. Next time, ask
1329 // for memory right after the place we just got some
1330 mmap_32bit_base = (void*)result + bytes;
1334 if ((W_)result > 0x80000000) {
1335 // oops, we were given memory over 2Gb
1336 // ... try allocating memory somewhere else?;
1337 debugTrace(DEBUG_linker,"MAP_32BIT didn't work; gave us %lu bytes at 0x%p", bytes, result);
1338 munmap(result, bytes);
1340 // Set a base address and try again... (guess: 1Gb)
1341 mmap_32bit_base = (void*)0x40000000;
1350 /* -----------------------------------------------------------------------------
1351 * Load an obj (populate the global symbol table, but don't resolve yet)
1353 * Returns: 1 if ok, 0 on error.
1356 loadObj( char *path )
1368 /* debugBelch("loadObj %s\n", path ); */
1370 /* Check that we haven't already loaded this object.
1371 Ignore requests to load multiple times */
1375 for (o = objects; o; o = o->next) {
1376 if (0 == strcmp(o->fileName, path)) {
1378 break; /* don't need to search further */
1382 IF_DEBUG(linker, debugBelch(
1383 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1384 "same object file twice:\n"
1386 "GHCi will ignore this, but be warned.\n"
1388 return 1; /* success */
1392 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1394 # if defined(OBJFORMAT_ELF)
1395 oc->formatName = "ELF";
1396 # elif defined(OBJFORMAT_PEi386)
1397 oc->formatName = "PEi386";
1398 # elif defined(OBJFORMAT_MACHO)
1399 oc->formatName = "Mach-O";
1402 barf("loadObj: not implemented on this platform");
1405 r = stat(path, &st);
1406 if (r == -1) { return 0; }
1408 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1409 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1410 strcpy(oc->fileName, path);
1412 oc->fileSize = st.st_size;
1414 oc->sections = NULL;
1415 oc->proddables = NULL;
1417 /* chain it onto the list of objects */
1422 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1424 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1426 #if defined(openbsd_HOST_OS)
1427 fd = open(path, O_RDONLY, S_IRUSR);
1429 fd = open(path, O_RDONLY);
1432 barf("loadObj: can't open `%s'", path);
1434 pagesize = getpagesize();
1436 #ifdef ia64_HOST_ARCH
1437 /* The PLT needs to be right before the object */
1438 n = ROUND_UP(PLTSize(), pagesize);
1439 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1440 if (oc->plt == MAP_FAILED)
1441 barf("loadObj: can't allocate PLT");
1444 map_addr = oc->plt + n;
1447 n = ROUND_UP(oc->fileSize, pagesize);
1449 #ifdef ia64_HOST_ARCH
1450 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1451 MAP_PRIVATE|TRY_MAP_32BIT, fd, 0);
1452 if (oc->image == MAP_FAILED)
1453 barf("loadObj: can't map `%s'", path);
1455 oc->image = mmapForLinker(n, 0, fd);
1460 #else /* !USE_MMAP */
1462 /* load the image into memory */
1463 f = fopen(path, "rb");
1465 barf("loadObj: can't read `%s'", path);
1467 # if defined(mingw32_HOST_OS)
1468 // TODO: We would like to use allocateExec here, but allocateExec
1469 // cannot currently allocate blocks large enough.
1470 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1471 PAGE_EXECUTE_READWRITE);
1472 # elif defined(darwin_HOST_OS)
1473 // In a Mach-O .o file, all sections can and will be misaligned
1474 // if the total size of the headers is not a multiple of the
1475 // desired alignment. This is fine for .o files that only serve
1476 // as input for the static linker, but it's not fine for us,
1477 // as SSE (used by gcc for floating point) and Altivec require
1478 // 16-byte alignment.
1479 // We calculate the correct alignment from the header before
1480 // reading the file, and then we misalign oc->image on purpose so
1481 // that the actual sections end up aligned again.
1482 oc->misalignment = machoGetMisalignment(f);
1483 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1484 oc->image += oc->misalignment;
1486 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1489 n = fread ( oc->image, 1, oc->fileSize, f );
1490 if (n != oc->fileSize)
1491 barf("loadObj: error whilst reading `%s'", path);
1494 #endif /* USE_MMAP */
1496 # if defined(OBJFORMAT_MACHO) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1497 r = ocAllocateSymbolExtras_MachO ( oc );
1498 if (!r) { return r; }
1499 # elif defined(OBJFORMAT_ELF) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1500 r = ocAllocateSymbolExtras_ELF ( oc );
1501 if (!r) { return r; }
1504 /* verify the in-memory image */
1505 # if defined(OBJFORMAT_ELF)
1506 r = ocVerifyImage_ELF ( oc );
1507 # elif defined(OBJFORMAT_PEi386)
1508 r = ocVerifyImage_PEi386 ( oc );
1509 # elif defined(OBJFORMAT_MACHO)
1510 r = ocVerifyImage_MachO ( oc );
1512 barf("loadObj: no verify method");
1514 if (!r) { return r; }
1516 /* build the symbol list for this image */
1517 # if defined(OBJFORMAT_ELF)
1518 r = ocGetNames_ELF ( oc );
1519 # elif defined(OBJFORMAT_PEi386)
1520 r = ocGetNames_PEi386 ( oc );
1521 # elif defined(OBJFORMAT_MACHO)
1522 r = ocGetNames_MachO ( oc );
1524 barf("loadObj: no getNames method");
1526 if (!r) { return r; }
1528 /* loaded, but not resolved yet */
1529 oc->status = OBJECT_LOADED;
1534 /* -----------------------------------------------------------------------------
1535 * resolve all the currently unlinked objects in memory
1537 * Returns: 1 if ok, 0 on error.
1547 for (oc = objects; oc; oc = oc->next) {
1548 if (oc->status != OBJECT_RESOLVED) {
1549 # if defined(OBJFORMAT_ELF)
1550 r = ocResolve_ELF ( oc );
1551 # elif defined(OBJFORMAT_PEi386)
1552 r = ocResolve_PEi386 ( oc );
1553 # elif defined(OBJFORMAT_MACHO)
1554 r = ocResolve_MachO ( oc );
1556 barf("resolveObjs: not implemented on this platform");
1558 if (!r) { return r; }
1559 oc->status = OBJECT_RESOLVED;
1565 /* -----------------------------------------------------------------------------
1566 * delete an object from the pool
1569 unloadObj( char *path )
1571 ObjectCode *oc, *prev;
1573 ASSERT(symhash != NULL);
1574 ASSERT(objects != NULL);
1579 for (oc = objects; oc; prev = oc, oc = oc->next) {
1580 if (!strcmp(oc->fileName,path)) {
1582 /* Remove all the mappings for the symbols within this
1587 for (i = 0; i < oc->n_symbols; i++) {
1588 if (oc->symbols[i] != NULL) {
1589 removeStrHashTable(symhash, oc->symbols[i], NULL);
1597 prev->next = oc->next;
1600 // We're going to leave this in place, in case there are
1601 // any pointers from the heap into it:
1602 // #ifdef mingw32_HOST_OS
1603 // VirtualFree(oc->image);
1605 // stgFree(oc->image);
1607 stgFree(oc->fileName);
1608 stgFree(oc->symbols);
1609 stgFree(oc->sections);
1615 errorBelch("unloadObj: can't find `%s' to unload", path);
1619 /* -----------------------------------------------------------------------------
1620 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1621 * which may be prodded during relocation, and abort if we try and write
1622 * outside any of these.
1624 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1627 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1628 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1632 pb->next = oc->proddables;
1633 oc->proddables = pb;
1636 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1639 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1640 char* s = (char*)(pb->start);
1641 char* e = s + pb->size - 1;
1642 char* a = (char*)addr;
1643 /* Assumes that the biggest fixup involves a 4-byte write. This
1644 probably needs to be changed to 8 (ie, +7) on 64-bit
1646 if (a >= s && (a+3) <= e) return;
1648 barf("checkProddableBlock: invalid fixup in runtime linker");
1651 /* -----------------------------------------------------------------------------
1652 * Section management.
1654 static void addSection ( ObjectCode* oc, SectionKind kind,
1655 void* start, void* end )
1657 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1661 s->next = oc->sections;
1664 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1665 start, ((char*)end)-1, end - start + 1, kind );
1670 /* --------------------------------------------------------------------------
1672 * This is about allocating a small chunk of memory for every symbol in the
1673 * object file. We make sure that the SymboLExtras are always "in range" of
1674 * limited-range PC-relative instructions on various platforms by allocating
1675 * them right next to the object code itself.
1678 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
1681 ocAllocateSymbolExtras
1683 Allocate additional space at the end of the object file image to make room
1684 for jump islands (powerpc, x86_64) and GOT entries (x86_64).
1686 PowerPC relative branch instructions have a 24 bit displacement field.
1687 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1688 If a particular imported symbol is outside this range, we have to redirect
1689 the jump to a short piece of new code that just loads the 32bit absolute
1690 address and jumps there.
1691 On x86_64, PC-relative jumps and PC-relative accesses to the GOT are limited
1694 This function just allocates space for one SymbolExtra for every
1695 undefined symbol in the object file. The code for the jump islands is
1696 filled in by makeSymbolExtra below.
1699 static int ocAllocateSymbolExtras( ObjectCode* oc, int count, int first )
1706 int misalignment = 0;
1707 #ifdef darwin_HOST_OS
1708 misalignment = oc->misalignment;
1714 // round up to the nearest 4
1715 aligned = (oc->fileSize + 3) & ~3;
1718 pagesize = getpagesize();
1719 n = ROUND_UP( oc->fileSize, pagesize );
1720 m = ROUND_UP( aligned + sizeof (SymbolExtra) * count, pagesize );
1722 /* we try to use spare space at the end of the last page of the
1723 * image for the jump islands, but if there isn't enough space
1724 * then we have to map some (anonymously, remembering MAP_32BIT).
1726 if( m > n ) // we need to allocate more pages
1728 oc->symbol_extras = mmapForLinker(sizeof(SymbolExtra) * count,
1733 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1736 oc->image -= misalignment;
1737 oc->image = stgReallocBytes( oc->image,
1739 aligned + sizeof (SymbolExtra) * count,
1740 "ocAllocateSymbolExtras" );
1741 oc->image += misalignment;
1743 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1744 #endif /* USE_MMAP */
1746 memset( oc->symbol_extras, 0, sizeof (SymbolExtra) * count );
1749 oc->symbol_extras = NULL;
1751 oc->first_symbol_extra = first;
1752 oc->n_symbol_extras = count;
1757 static SymbolExtra* makeSymbolExtra( ObjectCode* oc,
1758 unsigned long symbolNumber,
1759 unsigned long target )
1763 ASSERT( symbolNumber >= oc->first_symbol_extra
1764 && symbolNumber - oc->first_symbol_extra < oc->n_symbol_extras);
1766 extra = &oc->symbol_extras[symbolNumber - oc->first_symbol_extra];
1768 #ifdef powerpc_HOST_ARCH
1769 // lis r12, hi16(target)
1770 extra->jumpIsland.lis_r12 = 0x3d80;
1771 extra->jumpIsland.hi_addr = target >> 16;
1773 // ori r12, r12, lo16(target)
1774 extra->jumpIsland.ori_r12_r12 = 0x618c;
1775 extra->jumpIsland.lo_addr = target & 0xffff;
1778 extra->jumpIsland.mtctr_r12 = 0x7d8903a6;
1781 extra->jumpIsland.bctr = 0x4e800420;
1783 #ifdef x86_64_HOST_ARCH
1785 static uint8_t jmp[] = { 0xFF, 0x25, 0xF2, 0xFF, 0xFF, 0xFF };
1786 extra->addr = target;
1787 memcpy(extra->jumpIsland, jmp, 6);
1795 /* --------------------------------------------------------------------------
1796 * PowerPC specifics (instruction cache flushing)
1797 * ------------------------------------------------------------------------*/
1799 #ifdef powerpc_TARGET_ARCH
1801 ocFlushInstructionCache
1803 Flush the data & instruction caches.
1804 Because the PPC has split data/instruction caches, we have to
1805 do that whenever we modify code at runtime.
1808 static void ocFlushInstructionCache( ObjectCode *oc )
1810 int n = (oc->fileSize + sizeof( SymbolExtra ) * oc->n_symbol_extras + 3) / 4;
1811 unsigned long *p = (unsigned long *) oc->image;
1815 __asm__ volatile ( "dcbf 0,%0\n\t"
1823 __asm__ volatile ( "sync\n\t"
1829 /* --------------------------------------------------------------------------
1830 * PEi386 specifics (Win32 targets)
1831 * ------------------------------------------------------------------------*/
1833 /* The information for this linker comes from
1834 Microsoft Portable Executable
1835 and Common Object File Format Specification
1836 revision 5.1 January 1998
1837 which SimonM says comes from the MS Developer Network CDs.
1839 It can be found there (on older CDs), but can also be found
1842 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1844 (this is Rev 6.0 from February 1999).
1846 Things move, so if that fails, try searching for it via
1848 http://www.google.com/search?q=PE+COFF+specification
1850 The ultimate reference for the PE format is the Winnt.h
1851 header file that comes with the Platform SDKs; as always,
1852 implementations will drift wrt their documentation.
1854 A good background article on the PE format is Matt Pietrek's
1855 March 1994 article in Microsoft System Journal (MSJ)
1856 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1857 Win32 Portable Executable File Format." The info in there
1858 has recently been updated in a two part article in
1859 MSDN magazine, issues Feb and March 2002,
1860 "Inside Windows: An In-Depth Look into the Win32 Portable
1861 Executable File Format"
1863 John Levine's book "Linkers and Loaders" contains useful
1868 #if defined(OBJFORMAT_PEi386)
1872 typedef unsigned char UChar;
1873 typedef unsigned short UInt16;
1874 typedef unsigned int UInt32;
1881 UInt16 NumberOfSections;
1882 UInt32 TimeDateStamp;
1883 UInt32 PointerToSymbolTable;
1884 UInt32 NumberOfSymbols;
1885 UInt16 SizeOfOptionalHeader;
1886 UInt16 Characteristics;
1890 #define sizeof_COFF_header 20
1897 UInt32 VirtualAddress;
1898 UInt32 SizeOfRawData;
1899 UInt32 PointerToRawData;
1900 UInt32 PointerToRelocations;
1901 UInt32 PointerToLinenumbers;
1902 UInt16 NumberOfRelocations;
1903 UInt16 NumberOfLineNumbers;
1904 UInt32 Characteristics;
1908 #define sizeof_COFF_section 40
1915 UInt16 SectionNumber;
1918 UChar NumberOfAuxSymbols;
1922 #define sizeof_COFF_symbol 18
1927 UInt32 VirtualAddress;
1928 UInt32 SymbolTableIndex;
1933 #define sizeof_COFF_reloc 10
1936 /* From PE spec doc, section 3.3.2 */
1937 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1938 windows.h -- for the same purpose, but I want to know what I'm
1940 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1941 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1942 #define MYIMAGE_FILE_DLL 0x2000
1943 #define MYIMAGE_FILE_SYSTEM 0x1000
1944 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1945 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1946 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1948 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1949 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1950 #define MYIMAGE_SYM_CLASS_STATIC 3
1951 #define MYIMAGE_SYM_UNDEFINED 0
1953 /* From PE spec doc, section 4.1 */
1954 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1955 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1956 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1958 /* From PE spec doc, section 5.2.1 */
1959 #define MYIMAGE_REL_I386_DIR32 0x0006
1960 #define MYIMAGE_REL_I386_REL32 0x0014
1963 /* We use myindex to calculate array addresses, rather than
1964 simply doing the normal subscript thing. That's because
1965 some of the above structs have sizes which are not
1966 a whole number of words. GCC rounds their sizes up to a
1967 whole number of words, which means that the address calcs
1968 arising from using normal C indexing or pointer arithmetic
1969 are just plain wrong. Sigh.
1972 myindex ( int scale, void* base, int index )
1975 ((UChar*)base) + scale * index;
1980 printName ( UChar* name, UChar* strtab )
1982 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1983 UInt32 strtab_offset = * (UInt32*)(name+4);
1984 debugBelch("%s", strtab + strtab_offset );
1987 for (i = 0; i < 8; i++) {
1988 if (name[i] == 0) break;
1989 debugBelch("%c", name[i] );
1996 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1998 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1999 UInt32 strtab_offset = * (UInt32*)(name+4);
2000 strncpy ( dst, strtab+strtab_offset, dstSize );
2006 if (name[i] == 0) break;
2016 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
2019 /* If the string is longer than 8 bytes, look in the
2020 string table for it -- this will be correctly zero terminated.
2022 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2023 UInt32 strtab_offset = * (UInt32*)(name+4);
2024 return ((UChar*)strtab) + strtab_offset;
2026 /* Otherwise, if shorter than 8 bytes, return the original,
2027 which by defn is correctly terminated.
2029 if (name[7]==0) return name;
2030 /* The annoying case: 8 bytes. Copy into a temporary
2031 (which is never freed ...)
2033 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
2035 strncpy(newstr,name,8);
2041 /* Just compares the short names (first 8 chars) */
2042 static COFF_section *
2043 findPEi386SectionCalled ( ObjectCode* oc, char* name )
2047 = (COFF_header*)(oc->image);
2048 COFF_section* sectab
2050 ((UChar*)(oc->image))
2051 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2053 for (i = 0; i < hdr->NumberOfSections; i++) {
2056 COFF_section* section_i
2058 myindex ( sizeof_COFF_section, sectab, i );
2059 n1 = (UChar*) &(section_i->Name);
2061 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
2062 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
2063 n1[6]==n2[6] && n1[7]==n2[7])
2072 zapTrailingAtSign ( UChar* sym )
2074 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
2076 if (sym[0] == 0) return;
2078 while (sym[i] != 0) i++;
2081 while (j > 0 && my_isdigit(sym[j])) j--;
2082 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
2087 lookupSymbolInDLLs ( UChar *lbl )
2092 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
2093 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
2095 if (lbl[0] == '_') {
2096 /* HACK: if the name has an initial underscore, try stripping
2097 it off & look that up first. I've yet to verify whether there's
2098 a Rule that governs whether an initial '_' *should always* be
2099 stripped off when mapping from import lib name to the DLL name.
2101 sym = GetProcAddress(o_dll->instance, (lbl+1));
2103 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
2107 sym = GetProcAddress(o_dll->instance, lbl);
2109 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
2118 ocVerifyImage_PEi386 ( ObjectCode* oc )
2123 COFF_section* sectab;
2124 COFF_symbol* symtab;
2126 /* debugBelch("\nLOADING %s\n", oc->fileName); */
2127 hdr = (COFF_header*)(oc->image);
2128 sectab = (COFF_section*) (
2129 ((UChar*)(oc->image))
2130 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2132 symtab = (COFF_symbol*) (
2133 ((UChar*)(oc->image))
2134 + hdr->PointerToSymbolTable
2136 strtab = ((UChar*)symtab)
2137 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2139 if (hdr->Machine != 0x14c) {
2140 errorBelch("%s: Not x86 PEi386", oc->fileName);
2143 if (hdr->SizeOfOptionalHeader != 0) {
2144 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2147 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2148 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2149 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2150 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2151 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2154 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2155 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2156 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2158 (int)(hdr->Characteristics));
2161 /* If the string table size is way crazy, this might indicate that
2162 there are more than 64k relocations, despite claims to the
2163 contrary. Hence this test. */
2164 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2166 if ( (*(UInt32*)strtab) > 600000 ) {
2167 /* Note that 600k has no special significance other than being
2168 big enough to handle the almost-2MB-sized lumps that
2169 constitute HSwin32*.o. */
2170 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2175 /* No further verification after this point; only debug printing. */
2177 IF_DEBUG(linker, i=1);
2178 if (i == 0) return 1;
2180 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2181 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2182 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2185 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2186 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2187 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2188 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2189 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2190 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2191 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2193 /* Print the section table. */
2195 for (i = 0; i < hdr->NumberOfSections; i++) {
2197 COFF_section* sectab_i
2199 myindex ( sizeof_COFF_section, sectab, i );
2206 printName ( sectab_i->Name, strtab );
2216 sectab_i->VirtualSize,
2217 sectab_i->VirtualAddress,
2218 sectab_i->SizeOfRawData,
2219 sectab_i->PointerToRawData,
2220 sectab_i->NumberOfRelocations,
2221 sectab_i->PointerToRelocations,
2222 sectab_i->PointerToRawData
2224 reltab = (COFF_reloc*) (
2225 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2228 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2229 /* If the relocation field (a short) has overflowed, the
2230 * real count can be found in the first reloc entry.
2232 * See Section 4.1 (last para) of the PE spec (rev6.0).
2234 COFF_reloc* rel = (COFF_reloc*)
2235 myindex ( sizeof_COFF_reloc, reltab, 0 );
2236 noRelocs = rel->VirtualAddress;
2239 noRelocs = sectab_i->NumberOfRelocations;
2243 for (; j < noRelocs; j++) {
2245 COFF_reloc* rel = (COFF_reloc*)
2246 myindex ( sizeof_COFF_reloc, reltab, j );
2248 " type 0x%-4x vaddr 0x%-8x name `",
2250 rel->VirtualAddress );
2251 sym = (COFF_symbol*)
2252 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2253 /* Hmm..mysterious looking offset - what's it for? SOF */
2254 printName ( sym->Name, strtab -10 );
2261 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2262 debugBelch("---START of string table---\n");
2263 for (i = 4; i < *(Int32*)strtab; i++) {
2265 debugBelch("\n"); else
2266 debugBelch("%c", strtab[i] );
2268 debugBelch("--- END of string table---\n");
2273 COFF_symbol* symtab_i;
2274 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2275 symtab_i = (COFF_symbol*)
2276 myindex ( sizeof_COFF_symbol, symtab, i );
2282 printName ( symtab_i->Name, strtab );
2291 (Int32)(symtab_i->SectionNumber),
2292 (UInt32)symtab_i->Type,
2293 (UInt32)symtab_i->StorageClass,
2294 (UInt32)symtab_i->NumberOfAuxSymbols
2296 i += symtab_i->NumberOfAuxSymbols;
2306 ocGetNames_PEi386 ( ObjectCode* oc )
2309 COFF_section* sectab;
2310 COFF_symbol* symtab;
2317 hdr = (COFF_header*)(oc->image);
2318 sectab = (COFF_section*) (
2319 ((UChar*)(oc->image))
2320 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2322 symtab = (COFF_symbol*) (
2323 ((UChar*)(oc->image))
2324 + hdr->PointerToSymbolTable
2326 strtab = ((UChar*)(oc->image))
2327 + hdr->PointerToSymbolTable
2328 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2330 /* Allocate space for any (local, anonymous) .bss sections. */
2332 for (i = 0; i < hdr->NumberOfSections; i++) {
2335 COFF_section* sectab_i
2337 myindex ( sizeof_COFF_section, sectab, i );
2338 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2339 /* sof 10/05: the PE spec text isn't too clear regarding what
2340 * the SizeOfRawData field is supposed to hold for object
2341 * file sections containing just uninitialized data -- for executables,
2342 * it is supposed to be zero; unclear what it's supposed to be
2343 * for object files. However, VirtualSize is guaranteed to be
2344 * zero for object files, which definitely suggests that SizeOfRawData
2345 * will be non-zero (where else would the size of this .bss section be
2346 * stored?) Looking at the COFF_section info for incoming object files,
2347 * this certainly appears to be the case.
2349 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2350 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2351 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2352 * variable decls into to the .bss section. (The specific function in Q which
2353 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2355 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2356 /* This is a non-empty .bss section. Allocate zeroed space for
2357 it, and set its PointerToRawData field such that oc->image +
2358 PointerToRawData == addr_of_zeroed_space. */
2359 bss_sz = sectab_i->VirtualSize;
2360 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2361 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2362 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2363 addProddableBlock(oc, zspace, bss_sz);
2364 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2367 /* Copy section information into the ObjectCode. */
2369 for (i = 0; i < hdr->NumberOfSections; i++) {
2375 = SECTIONKIND_OTHER;
2376 COFF_section* sectab_i
2378 myindex ( sizeof_COFF_section, sectab, i );
2379 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2382 /* I'm sure this is the Right Way to do it. However, the
2383 alternative of testing the sectab_i->Name field seems to
2384 work ok with Cygwin.
2386 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2387 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2388 kind = SECTIONKIND_CODE_OR_RODATA;
2391 if (0==strcmp(".text",sectab_i->Name) ||
2392 0==strcmp(".rdata",sectab_i->Name)||
2393 0==strcmp(".rodata",sectab_i->Name))
2394 kind = SECTIONKIND_CODE_OR_RODATA;
2395 if (0==strcmp(".data",sectab_i->Name) ||
2396 0==strcmp(".bss",sectab_i->Name))
2397 kind = SECTIONKIND_RWDATA;
2399 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2400 sz = sectab_i->SizeOfRawData;
2401 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2403 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2404 end = start + sz - 1;
2406 if (kind == SECTIONKIND_OTHER
2407 /* Ignore sections called which contain stabs debugging
2409 && 0 != strcmp(".stab", sectab_i->Name)
2410 && 0 != strcmp(".stabstr", sectab_i->Name)
2411 /* ignore constructor section for now */
2412 && 0 != strcmp(".ctors", sectab_i->Name)
2413 /* ignore section generated from .ident */
2414 && 0!= strcmp("/4", sectab_i->Name)
2415 /* ignore unknown section that appeared in gcc 3.4.5(?) */
2416 && 0!= strcmp(".reloc", sectab_i->Name)
2418 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2422 if (kind != SECTIONKIND_OTHER && end >= start) {
2423 addSection(oc, kind, start, end);
2424 addProddableBlock(oc, start, end - start + 1);
2428 /* Copy exported symbols into the ObjectCode. */
2430 oc->n_symbols = hdr->NumberOfSymbols;
2431 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2432 "ocGetNames_PEi386(oc->symbols)");
2433 /* Call me paranoid; I don't care. */
2434 for (i = 0; i < oc->n_symbols; i++)
2435 oc->symbols[i] = NULL;
2439 COFF_symbol* symtab_i;
2440 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2441 symtab_i = (COFF_symbol*)
2442 myindex ( sizeof_COFF_symbol, symtab, i );
2446 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2447 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2448 /* This symbol is global and defined, viz, exported */
2449 /* for MYIMAGE_SYMCLASS_EXTERNAL
2450 && !MYIMAGE_SYM_UNDEFINED,
2451 the address of the symbol is:
2452 address of relevant section + offset in section
2454 COFF_section* sectabent
2455 = (COFF_section*) myindex ( sizeof_COFF_section,
2457 symtab_i->SectionNumber-1 );
2458 addr = ((UChar*)(oc->image))
2459 + (sectabent->PointerToRawData
2463 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2464 && symtab_i->Value > 0) {
2465 /* This symbol isn't in any section at all, ie, global bss.
2466 Allocate zeroed space for it. */
2467 addr = stgCallocBytes(1, symtab_i->Value,
2468 "ocGetNames_PEi386(non-anonymous bss)");
2469 addSection(oc, SECTIONKIND_RWDATA, addr,
2470 ((UChar*)addr) + symtab_i->Value - 1);
2471 addProddableBlock(oc, addr, symtab_i->Value);
2472 /* debugBelch("BSS section at 0x%x\n", addr); */
2475 if (addr != NULL ) {
2476 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2477 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2478 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2479 ASSERT(i >= 0 && i < oc->n_symbols);
2480 /* cstring_from_COFF_symbol_name always succeeds. */
2481 oc->symbols[i] = sname;
2482 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2486 "IGNORING symbol %d\n"
2490 printName ( symtab_i->Name, strtab );
2499 (Int32)(symtab_i->SectionNumber),
2500 (UInt32)symtab_i->Type,
2501 (UInt32)symtab_i->StorageClass,
2502 (UInt32)symtab_i->NumberOfAuxSymbols
2507 i += symtab_i->NumberOfAuxSymbols;
2516 ocResolve_PEi386 ( ObjectCode* oc )
2519 COFF_section* sectab;
2520 COFF_symbol* symtab;
2530 /* ToDo: should be variable-sized? But is at least safe in the
2531 sense of buffer-overrun-proof. */
2533 /* debugBelch("resolving for %s\n", oc->fileName); */
2535 hdr = (COFF_header*)(oc->image);
2536 sectab = (COFF_section*) (
2537 ((UChar*)(oc->image))
2538 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2540 symtab = (COFF_symbol*) (
2541 ((UChar*)(oc->image))
2542 + hdr->PointerToSymbolTable
2544 strtab = ((UChar*)(oc->image))
2545 + hdr->PointerToSymbolTable
2546 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2548 for (i = 0; i < hdr->NumberOfSections; i++) {
2549 COFF_section* sectab_i
2551 myindex ( sizeof_COFF_section, sectab, i );
2554 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2557 /* Ignore sections called which contain stabs debugging
2559 if (0 == strcmp(".stab", sectab_i->Name)
2560 || 0 == strcmp(".stabstr", sectab_i->Name)
2561 || 0 == strcmp(".ctors", sectab_i->Name))
2564 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2565 /* If the relocation field (a short) has overflowed, the
2566 * real count can be found in the first reloc entry.
2568 * See Section 4.1 (last para) of the PE spec (rev6.0).
2570 * Nov2003 update: the GNU linker still doesn't correctly
2571 * handle the generation of relocatable object files with
2572 * overflown relocations. Hence the output to warn of potential
2575 COFF_reloc* rel = (COFF_reloc*)
2576 myindex ( sizeof_COFF_reloc, reltab, 0 );
2577 noRelocs = rel->VirtualAddress;
2579 /* 10/05: we now assume (and check for) a GNU ld that is capable
2580 * of handling object files with (>2^16) of relocs.
2583 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2588 noRelocs = sectab_i->NumberOfRelocations;
2593 for (; j < noRelocs; j++) {
2595 COFF_reloc* reltab_j
2597 myindex ( sizeof_COFF_reloc, reltab, j );
2599 /* the location to patch */
2601 ((UChar*)(oc->image))
2602 + (sectab_i->PointerToRawData
2603 + reltab_j->VirtualAddress
2604 - sectab_i->VirtualAddress )
2606 /* the existing contents of pP */
2608 /* the symbol to connect to */
2609 sym = (COFF_symbol*)
2610 myindex ( sizeof_COFF_symbol,
2611 symtab, reltab_j->SymbolTableIndex );
2614 "reloc sec %2d num %3d: type 0x%-4x "
2615 "vaddr 0x%-8x name `",
2617 (UInt32)reltab_j->Type,
2618 reltab_j->VirtualAddress );
2619 printName ( sym->Name, strtab );
2620 debugBelch("'\n" ));
2622 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2623 COFF_section* section_sym
2624 = findPEi386SectionCalled ( oc, sym->Name );
2626 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2629 S = ((UInt32)(oc->image))
2630 + (section_sym->PointerToRawData
2633 copyName ( sym->Name, strtab, symbol, 1000-1 );
2634 S = (UInt32) lookupSymbol( symbol );
2635 if ((void*)S != NULL) goto foundit;
2636 /* Newline first because the interactive linker has printed "linking..." */
2637 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2641 checkProddableBlock(oc, pP);
2642 switch (reltab_j->Type) {
2643 case MYIMAGE_REL_I386_DIR32:
2646 case MYIMAGE_REL_I386_REL32:
2647 /* Tricky. We have to insert a displacement at
2648 pP which, when added to the PC for the _next_
2649 insn, gives the address of the target (S).
2650 Problem is to know the address of the next insn
2651 when we only know pP. We assume that this
2652 literal field is always the last in the insn,
2653 so that the address of the next insn is pP+4
2654 -- hence the constant 4.
2655 Also I don't know if A should be added, but so
2656 far it has always been zero.
2658 SOF 05/2005: 'A' (old contents of *pP) have been observed
2659 to contain values other than zero (the 'wx' object file
2660 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2661 So, add displacement to old value instead of asserting
2662 A to be zero. Fixes wxhaskell-related crashes, and no other
2663 ill effects have been observed.
2665 Update: the reason why we're seeing these more elaborate
2666 relocations is due to a switch in how the NCG compiles SRTs
2667 and offsets to them from info tables. SRTs live in .(ro)data,
2668 while info tables live in .text, causing GAS to emit REL32/DISP32
2669 relocations with non-zero values. Adding the displacement is
2670 the right thing to do.
2672 *pP = S - ((UInt32)pP) - 4 + A;
2675 debugBelch("%s: unhandled PEi386 relocation type %d",
2676 oc->fileName, reltab_j->Type);
2683 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2687 #endif /* defined(OBJFORMAT_PEi386) */
2690 /* --------------------------------------------------------------------------
2692 * ------------------------------------------------------------------------*/
2694 #if defined(OBJFORMAT_ELF)
2699 #if defined(sparc_HOST_ARCH)
2700 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2701 #elif defined(i386_HOST_ARCH)
2702 # define ELF_TARGET_386 /* Used inside <elf.h> */
2703 #elif defined(x86_64_HOST_ARCH)
2704 # define ELF_TARGET_X64_64
2706 #elif defined (ia64_HOST_ARCH)
2707 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2709 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2710 # define ELF_NEED_GOT /* needs Global Offset Table */
2711 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2714 #if !defined(openbsd_HOST_OS)
2717 /* openbsd elf has things in different places, with diff names */
2718 # include <elf_abi.h>
2719 # include <machine/reloc.h>
2720 # define R_386_32 RELOC_32
2721 # define R_386_PC32 RELOC_PC32
2724 /* If elf.h doesn't define it */
2725 # ifndef R_X86_64_PC64
2726 # define R_X86_64_PC64 24
2730 * Define a set of types which can be used for both ELF32 and ELF64
2734 #define ELFCLASS ELFCLASS64
2735 #define Elf_Addr Elf64_Addr
2736 #define Elf_Word Elf64_Word
2737 #define Elf_Sword Elf64_Sword
2738 #define Elf_Ehdr Elf64_Ehdr
2739 #define Elf_Phdr Elf64_Phdr
2740 #define Elf_Shdr Elf64_Shdr
2741 #define Elf_Sym Elf64_Sym
2742 #define Elf_Rel Elf64_Rel
2743 #define Elf_Rela Elf64_Rela
2744 #define ELF_ST_TYPE ELF64_ST_TYPE
2745 #define ELF_ST_BIND ELF64_ST_BIND
2746 #define ELF_R_TYPE ELF64_R_TYPE
2747 #define ELF_R_SYM ELF64_R_SYM
2749 #define ELFCLASS ELFCLASS32
2750 #define Elf_Addr Elf32_Addr
2751 #define Elf_Word Elf32_Word
2752 #define Elf_Sword Elf32_Sword
2753 #define Elf_Ehdr Elf32_Ehdr
2754 #define Elf_Phdr Elf32_Phdr
2755 #define Elf_Shdr Elf32_Shdr
2756 #define Elf_Sym Elf32_Sym
2757 #define Elf_Rel Elf32_Rel
2758 #define Elf_Rela Elf32_Rela
2760 #define ELF_ST_TYPE ELF32_ST_TYPE
2763 #define ELF_ST_BIND ELF32_ST_BIND
2766 #define ELF_R_TYPE ELF32_R_TYPE
2769 #define ELF_R_SYM ELF32_R_SYM
2775 * Functions to allocate entries in dynamic sections. Currently we simply
2776 * preallocate a large number, and we don't check if a entry for the given
2777 * target already exists (a linear search is too slow). Ideally these
2778 * entries would be associated with symbols.
2781 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2782 #define GOT_SIZE 0x20000
2783 #define FUNCTION_TABLE_SIZE 0x10000
2784 #define PLT_SIZE 0x08000
2787 static Elf_Addr got[GOT_SIZE];
2788 static unsigned int gotIndex;
2789 static Elf_Addr gp_val = (Elf_Addr)got;
2792 allocateGOTEntry(Elf_Addr target)
2796 if (gotIndex >= GOT_SIZE)
2797 barf("Global offset table overflow");
2799 entry = &got[gotIndex++];
2801 return (Elf_Addr)entry;
2805 #ifdef ELF_FUNCTION_DESC
2811 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2812 static unsigned int functionTableIndex;
2815 allocateFunctionDesc(Elf_Addr target)
2817 FunctionDesc *entry;
2819 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2820 barf("Function table overflow");
2822 entry = &functionTable[functionTableIndex++];
2824 entry->gp = (Elf_Addr)gp_val;
2825 return (Elf_Addr)entry;
2829 copyFunctionDesc(Elf_Addr target)
2831 FunctionDesc *olddesc = (FunctionDesc *)target;
2832 FunctionDesc *newdesc;
2834 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2835 newdesc->gp = olddesc->gp;
2836 return (Elf_Addr)newdesc;
2841 #ifdef ia64_HOST_ARCH
2842 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2843 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2845 static unsigned char plt_code[] =
2847 /* taken from binutils bfd/elfxx-ia64.c */
2848 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2849 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2850 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2851 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2852 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2853 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2856 /* If we can't get to the function descriptor via gp, take a local copy of it */
2857 #define PLT_RELOC(code, target) { \
2858 Elf64_Sxword rel_value = target - gp_val; \
2859 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2860 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2862 ia64_reloc_gprel22((Elf_Addr)code, target); \
2867 unsigned char code[sizeof(plt_code)];
2871 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2873 PLTEntry *plt = (PLTEntry *)oc->plt;
2876 if (oc->pltIndex >= PLT_SIZE)
2877 barf("Procedure table overflow");
2879 entry = &plt[oc->pltIndex++];
2880 memcpy(entry->code, plt_code, sizeof(entry->code));
2881 PLT_RELOC(entry->code, target);
2882 return (Elf_Addr)entry;
2888 return (PLT_SIZE * sizeof(PLTEntry));
2894 * Generic ELF functions
2898 findElfSection ( void* objImage, Elf_Word sh_type )
2900 char* ehdrC = (char*)objImage;
2901 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2902 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2903 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2907 for (i = 0; i < ehdr->e_shnum; i++) {
2908 if (shdr[i].sh_type == sh_type
2909 /* Ignore the section header's string table. */
2910 && i != ehdr->e_shstrndx
2911 /* Ignore string tables named .stabstr, as they contain
2913 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2915 ptr = ehdrC + shdr[i].sh_offset;
2922 #if defined(ia64_HOST_ARCH)
2924 findElfSegment ( void* objImage, Elf_Addr vaddr )
2926 char* ehdrC = (char*)objImage;
2927 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2928 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2929 Elf_Addr segaddr = 0;
2932 for (i = 0; i < ehdr->e_phnum; i++) {
2933 segaddr = phdr[i].p_vaddr;
2934 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2942 ocVerifyImage_ELF ( ObjectCode* oc )
2946 int i, j, nent, nstrtab, nsymtabs;
2950 char* ehdrC = (char*)(oc->image);
2951 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2953 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2954 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2955 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2956 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2957 errorBelch("%s: not an ELF object", oc->fileName);
2961 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2962 errorBelch("%s: unsupported ELF format", oc->fileName);
2966 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2967 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2969 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2970 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2972 errorBelch("%s: unknown endiannness", oc->fileName);
2976 if (ehdr->e_type != ET_REL) {
2977 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2980 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2982 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2983 switch (ehdr->e_machine) {
2984 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2985 #ifdef EM_SPARC32PLUS
2986 case EM_SPARC32PLUS:
2988 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2990 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2992 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2994 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2995 #elif defined(EM_AMD64)
2996 case EM_AMD64: IF_DEBUG(linker,debugBelch( "amd64" )); break;
2998 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2999 errorBelch("%s: unknown architecture (e_machine == %d)"
3000 , oc->fileName, ehdr->e_machine);
3004 IF_DEBUG(linker,debugBelch(
3005 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
3006 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
3008 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
3010 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3012 if (ehdr->e_shstrndx == SHN_UNDEF) {
3013 errorBelch("%s: no section header string table", oc->fileName);
3016 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
3018 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
3021 for (i = 0; i < ehdr->e_shnum; i++) {
3022 IF_DEBUG(linker,debugBelch("%2d: ", i ));
3023 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
3024 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
3025 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
3026 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
3027 ehdrC + shdr[i].sh_offset,
3028 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
3030 if (shdr[i].sh_type == SHT_REL) {
3031 IF_DEBUG(linker,debugBelch("Rel " ));
3032 } else if (shdr[i].sh_type == SHT_RELA) {
3033 IF_DEBUG(linker,debugBelch("RelA " ));
3035 IF_DEBUG(linker,debugBelch(" "));
3038 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
3042 IF_DEBUG(linker,debugBelch( "\nString tables" ));
3045 for (i = 0; i < ehdr->e_shnum; i++) {
3046 if (shdr[i].sh_type == SHT_STRTAB
3047 /* Ignore the section header's string table. */
3048 && i != ehdr->e_shstrndx
3049 /* Ignore string tables named .stabstr, as they contain
3051 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
3053 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
3054 strtab = ehdrC + shdr[i].sh_offset;
3059 errorBelch("%s: no string tables, or too many", oc->fileName);
3064 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
3065 for (i = 0; i < ehdr->e_shnum; i++) {
3066 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3067 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
3069 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3070 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3071 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
3073 (long)shdr[i].sh_size % sizeof(Elf_Sym)
3075 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
3076 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
3079 for (j = 0; j < nent; j++) {
3080 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3081 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3082 (int)stab[j].st_shndx,
3083 (int)stab[j].st_size,
3084 (char*)stab[j].st_value ));
3086 IF_DEBUG(linker,debugBelch("type=" ));
3087 switch (ELF_ST_TYPE(stab[j].st_info)) {
3088 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3089 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3090 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3091 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3092 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3093 default: IF_DEBUG(linker,debugBelch("? " )); break;
3095 IF_DEBUG(linker,debugBelch(" " ));
3097 IF_DEBUG(linker,debugBelch("bind=" ));
3098 switch (ELF_ST_BIND(stab[j].st_info)) {
3099 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3100 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3101 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3102 default: IF_DEBUG(linker,debugBelch("? " )); break;
3104 IF_DEBUG(linker,debugBelch(" " ));
3106 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3110 if (nsymtabs == 0) {
3111 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3118 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3122 if (hdr->sh_type == SHT_PROGBITS
3123 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3124 /* .text-style section */
3125 return SECTIONKIND_CODE_OR_RODATA;
3128 if (hdr->sh_type == SHT_PROGBITS
3129 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3130 /* .data-style section */
3131 return SECTIONKIND_RWDATA;
3134 if (hdr->sh_type == SHT_PROGBITS
3135 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3136 /* .rodata-style section */
3137 return SECTIONKIND_CODE_OR_RODATA;
3140 if (hdr->sh_type == SHT_NOBITS
3141 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3142 /* .bss-style section */
3144 return SECTIONKIND_RWDATA;
3147 return SECTIONKIND_OTHER;
3152 ocGetNames_ELF ( ObjectCode* oc )
3157 char* ehdrC = (char*)(oc->image);
3158 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3159 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3160 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3162 ASSERT(symhash != NULL);
3165 errorBelch("%s: no strtab", oc->fileName);
3170 for (i = 0; i < ehdr->e_shnum; i++) {
3171 /* Figure out what kind of section it is. Logic derived from
3172 Figure 1.14 ("Special Sections") of the ELF document
3173 ("Portable Formats Specification, Version 1.1"). */
3175 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3177 if (is_bss && shdr[i].sh_size > 0) {
3178 /* This is a non-empty .bss section. Allocate zeroed space for
3179 it, and set its .sh_offset field such that
3180 ehdrC + .sh_offset == addr_of_zeroed_space. */
3181 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3182 "ocGetNames_ELF(BSS)");
3183 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3185 debugBelch("BSS section at 0x%x, size %d\n",
3186 zspace, shdr[i].sh_size);
3190 /* fill in the section info */
3191 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3192 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3193 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3194 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3197 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3199 /* copy stuff into this module's object symbol table */
3200 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3201 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3203 oc->n_symbols = nent;
3204 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3205 "ocGetNames_ELF(oc->symbols)");
3207 for (j = 0; j < nent; j++) {
3209 char isLocal = FALSE; /* avoids uninit-var warning */
3211 char* nm = strtab + stab[j].st_name;
3212 int secno = stab[j].st_shndx;
3214 /* Figure out if we want to add it; if so, set ad to its
3215 address. Otherwise leave ad == NULL. */
3217 if (secno == SHN_COMMON) {
3219 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3221 debugBelch("COMMON symbol, size %d name %s\n",
3222 stab[j].st_size, nm);
3224 /* Pointless to do addProddableBlock() for this area,
3225 since the linker should never poke around in it. */
3228 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3229 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3231 /* and not an undefined symbol */
3232 && stab[j].st_shndx != SHN_UNDEF
3233 /* and not in a "special section" */
3234 && stab[j].st_shndx < SHN_LORESERVE
3236 /* and it's a not a section or string table or anything silly */
3237 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3238 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3239 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3242 /* Section 0 is the undefined section, hence > and not >=. */
3243 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3245 if (shdr[secno].sh_type == SHT_NOBITS) {
3246 debugBelch(" BSS symbol, size %d off %d name %s\n",
3247 stab[j].st_size, stab[j].st_value, nm);
3250 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3251 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3254 #ifdef ELF_FUNCTION_DESC
3255 /* dlsym() and the initialisation table both give us function
3256 * descriptors, so to be consistent we store function descriptors
3257 * in the symbol table */
3258 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3259 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3261 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s\n",
3262 ad, oc->fileName, nm ));
3267 /* And the decision is ... */
3271 oc->symbols[j] = nm;
3274 /* Ignore entirely. */
3276 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3280 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3281 strtab + stab[j].st_name ));
3284 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3285 (int)ELF_ST_BIND(stab[j].st_info),
3286 (int)ELF_ST_TYPE(stab[j].st_info),
3287 (int)stab[j].st_shndx,
3288 strtab + stab[j].st_name
3291 oc->symbols[j] = NULL;
3300 /* Do ELF relocations which lack an explicit addend. All x86-linux
3301 relocations appear to be of this form. */
3303 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3304 Elf_Shdr* shdr, int shnum,
3305 Elf_Sym* stab, char* strtab )
3310 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3311 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3312 int target_shndx = shdr[shnum].sh_info;
3313 int symtab_shndx = shdr[shnum].sh_link;
3315 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3316 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3317 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3318 target_shndx, symtab_shndx ));
3320 /* Skip sections that we're not interested in. */
3323 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3324 if (kind == SECTIONKIND_OTHER) {
3325 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3330 for (j = 0; j < nent; j++) {
3331 Elf_Addr offset = rtab[j].r_offset;
3332 Elf_Addr info = rtab[j].r_info;
3334 Elf_Addr P = ((Elf_Addr)targ) + offset;
3335 Elf_Word* pP = (Elf_Word*)P;
3340 StgStablePtr stablePtr;
3343 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3344 j, (void*)offset, (void*)info ));
3346 IF_DEBUG(linker,debugBelch( " ZERO" ));
3349 Elf_Sym sym = stab[ELF_R_SYM(info)];
3350 /* First see if it is a local symbol. */
3351 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3352 /* Yes, so we can get the address directly from the ELF symbol
3354 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3356 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3357 + stab[ELF_R_SYM(info)].st_value);
3360 symbol = strtab + sym.st_name;
3361 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3362 if (NULL == stablePtr) {
3363 /* No, so look up the name in our global table. */
3364 S_tmp = lookupSymbol( symbol );
3365 S = (Elf_Addr)S_tmp;
3367 stableVal = deRefStablePtr( stablePtr );
3369 S = (Elf_Addr)S_tmp;
3373 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3376 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3379 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3380 (void*)P, (void*)S, (void*)A ));
3381 checkProddableBlock ( oc, pP );
3385 switch (ELF_R_TYPE(info)) {
3386 # ifdef i386_HOST_ARCH
3387 case R_386_32: *pP = value; break;
3388 case R_386_PC32: *pP = value - P; break;
3391 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3392 oc->fileName, (lnat)ELF_R_TYPE(info));
3400 /* Do ELF relocations for which explicit addends are supplied.
3401 sparc-solaris relocations appear to be of this form. */
3403 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3404 Elf_Shdr* shdr, int shnum,
3405 Elf_Sym* stab, char* strtab )
3408 char *symbol = NULL;
3410 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3411 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3412 int target_shndx = shdr[shnum].sh_info;
3413 int symtab_shndx = shdr[shnum].sh_link;
3415 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3416 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3417 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3418 target_shndx, symtab_shndx ));
3420 for (j = 0; j < nent; j++) {
3421 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3422 /* This #ifdef only serves to avoid unused-var warnings. */
3423 Elf_Addr offset = rtab[j].r_offset;
3424 Elf_Addr P = targ + offset;
3426 Elf_Addr info = rtab[j].r_info;
3427 Elf_Addr A = rtab[j].r_addend;
3431 # if defined(sparc_HOST_ARCH)
3432 Elf_Word* pP = (Elf_Word*)P;
3434 # elif defined(ia64_HOST_ARCH)
3435 Elf64_Xword *pP = (Elf64_Xword *)P;
3437 # elif defined(powerpc_HOST_ARCH)
3441 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3442 j, (void*)offset, (void*)info,
3445 IF_DEBUG(linker,debugBelch( " ZERO" ));
3448 Elf_Sym sym = stab[ELF_R_SYM(info)];
3449 /* First see if it is a local symbol. */
3450 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3451 /* Yes, so we can get the address directly from the ELF symbol
3453 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3455 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3456 + stab[ELF_R_SYM(info)].st_value);
3457 #ifdef ELF_FUNCTION_DESC
3458 /* Make a function descriptor for this function */
3459 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3460 S = allocateFunctionDesc(S + A);
3465 /* No, so look up the name in our global table. */
3466 symbol = strtab + sym.st_name;
3467 S_tmp = lookupSymbol( symbol );
3468 S = (Elf_Addr)S_tmp;
3470 #ifdef ELF_FUNCTION_DESC
3471 /* If a function, already a function descriptor - we would
3472 have to copy it to add an offset. */
3473 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3474 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3478 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3481 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3484 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3485 (void*)P, (void*)S, (void*)A ));
3486 /* checkProddableBlock ( oc, (void*)P ); */
3490 switch (ELF_R_TYPE(info)) {
3491 # if defined(sparc_HOST_ARCH)
3492 case R_SPARC_WDISP30:
3493 w1 = *pP & 0xC0000000;
3494 w2 = (Elf_Word)((value - P) >> 2);
3495 ASSERT((w2 & 0xC0000000) == 0);
3500 w1 = *pP & 0xFFC00000;
3501 w2 = (Elf_Word)(value >> 10);
3502 ASSERT((w2 & 0xFFC00000) == 0);
3508 w2 = (Elf_Word)(value & 0x3FF);
3509 ASSERT((w2 & ~0x3FF) == 0);
3513 /* According to the Sun documentation:
3515 This relocation type resembles R_SPARC_32, except it refers to an
3516 unaligned word. That is, the word to be relocated must be treated
3517 as four separate bytes with arbitrary alignment, not as a word
3518 aligned according to the architecture requirements.
3520 (JRS: which means that freeloading on the R_SPARC_32 case
3521 is probably wrong, but hey ...)
3525 w2 = (Elf_Word)value;
3528 # elif defined(ia64_HOST_ARCH)
3529 case R_IA64_DIR64LSB:
3530 case R_IA64_FPTR64LSB:
3533 case R_IA64_PCREL64LSB:
3536 case R_IA64_SEGREL64LSB:
3537 addr = findElfSegment(ehdrC, value);
3540 case R_IA64_GPREL22:
3541 ia64_reloc_gprel22(P, value);
3543 case R_IA64_LTOFF22:
3544 case R_IA64_LTOFF22X:
3545 case R_IA64_LTOFF_FPTR22:
3546 addr = allocateGOTEntry(value);
3547 ia64_reloc_gprel22(P, addr);
3549 case R_IA64_PCREL21B:
3550 ia64_reloc_pcrel21(P, S, oc);
3553 /* This goes with R_IA64_LTOFF22X and points to the load to
3554 * convert into a move. We don't implement relaxation. */
3556 # elif defined(powerpc_HOST_ARCH)
3557 case R_PPC_ADDR16_LO:
3558 *(Elf32_Half*) P = value;
3561 case R_PPC_ADDR16_HI:
3562 *(Elf32_Half*) P = value >> 16;
3565 case R_PPC_ADDR16_HA:
3566 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3570 *(Elf32_Word *) P = value;
3574 *(Elf32_Word *) P = value - P;
3580 if( delta << 6 >> 6 != delta )
3582 value = (Elf_Addr) (&makeSymbolExtra( oc, ELF_R_SYM(info), value )
3586 if( value == 0 || delta << 6 >> 6 != delta )
3588 barf( "Unable to make SymbolExtra for #%d",
3594 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3595 | (delta & 0x3fffffc);
3599 #if x86_64_HOST_ARCH
3601 *(Elf64_Xword *)P = value;
3606 StgInt64 off = value - P;
3607 if (off >= 0x7fffffffL || off < -0x80000000L) {
3608 #if X86_64_ELF_NONPIC_HACK
3609 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3611 off = pltAddress + A - P;
3613 barf("R_X86_64_PC32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3614 symbol, off, oc->fileName );
3617 *(Elf64_Word *)P = (Elf64_Word)off;
3623 StgInt64 off = value - P;
3624 *(Elf64_Word *)P = (Elf64_Word)off;
3629 if (value >= 0x7fffffffL) {
3630 #if X86_64_ELF_NONPIC_HACK
3631 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3633 value = pltAddress + A;
3635 barf("R_X86_64_32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3636 symbol, value, oc->fileName );
3639 *(Elf64_Word *)P = (Elf64_Word)value;
3643 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3644 #if X86_64_ELF_NONPIC_HACK
3645 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3647 value = pltAddress + A;
3649 barf("R_X86_64_32S relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3650 symbol, value, oc->fileName );
3653 *(Elf64_Sword *)P = (Elf64_Sword)value;
3656 case R_X86_64_GOTPCREL:
3658 StgInt64 gotAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)->addr;
3659 StgInt64 off = gotAddress + A - P;
3660 *(Elf64_Word *)P = (Elf64_Word)off;
3664 case R_X86_64_PLT32:
3666 StgInt64 off = value - P;
3667 if (off >= 0x7fffffffL || off < -0x80000000L) {
3668 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3670 off = pltAddress + A - P;
3672 *(Elf64_Word *)P = (Elf64_Word)off;
3678 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3679 oc->fileName, (lnat)ELF_R_TYPE(info));
3688 ocResolve_ELF ( ObjectCode* oc )
3692 Elf_Sym* stab = NULL;
3693 char* ehdrC = (char*)(oc->image);
3694 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3695 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3697 /* first find "the" symbol table */
3698 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3700 /* also go find the string table */
3701 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3703 if (stab == NULL || strtab == NULL) {
3704 errorBelch("%s: can't find string or symbol table", oc->fileName);
3708 /* Process the relocation sections. */
3709 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3710 if (shdr[shnum].sh_type == SHT_REL) {
3711 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3712 shnum, stab, strtab );
3716 if (shdr[shnum].sh_type == SHT_RELA) {
3717 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3718 shnum, stab, strtab );
3723 #if defined(powerpc_HOST_ARCH)
3724 ocFlushInstructionCache( oc );
3732 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3733 * at the front. The following utility functions pack and unpack instructions, and
3734 * take care of the most common relocations.
3737 #ifdef ia64_HOST_ARCH
3740 ia64_extract_instruction(Elf64_Xword *target)
3743 int slot = (Elf_Addr)target & 3;
3744 target = (Elf_Addr)target & ~3;
3752 return ((w1 >> 5) & 0x1ffffffffff);
3754 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3758 barf("ia64_extract_instruction: invalid slot %p", target);
3763 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3765 int slot = (Elf_Addr)target & 3;
3766 target = (Elf_Addr)target & ~3;
3771 *target |= value << 5;
3774 *target |= value << 46;
3775 *(target+1) |= value >> 18;
3778 *(target+1) |= value << 23;
3784 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3786 Elf64_Xword instruction;
3787 Elf64_Sxword rel_value;
3789 rel_value = value - gp_val;
3790 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3791 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3793 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3794 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3795 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3796 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3797 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3798 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3802 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3804 Elf64_Xword instruction;
3805 Elf64_Sxword rel_value;
3808 entry = allocatePLTEntry(value, oc);
3810 rel_value = (entry >> 4) - (target >> 4);
3811 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3812 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3814 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3815 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3816 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3817 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3823 * PowerPC & X86_64 ELF specifics
3826 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3828 static int ocAllocateSymbolExtras_ELF( ObjectCode *oc )
3834 ehdr = (Elf_Ehdr *) oc->image;
3835 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3837 for( i = 0; i < ehdr->e_shnum; i++ )
3838 if( shdr[i].sh_type == SHT_SYMTAB )
3841 if( i == ehdr->e_shnum )
3843 errorBelch( "This ELF file contains no symtab" );
3847 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3849 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3850 (int) shdr[i].sh_entsize, (int) sizeof( Elf_Sym ) );
3855 return ocAllocateSymbolExtras( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3858 #endif /* powerpc */
3862 /* --------------------------------------------------------------------------
3864 * ------------------------------------------------------------------------*/
3866 #if defined(OBJFORMAT_MACHO)
3869 Support for MachO linking on Darwin/MacOS X
3870 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3872 I hereby formally apologize for the hackish nature of this code.
3873 Things that need to be done:
3874 *) implement ocVerifyImage_MachO
3875 *) add still more sanity checks.
3878 #if x86_64_HOST_ARCH || powerpc64_HOST_ARCH
3879 #define mach_header mach_header_64
3880 #define segment_command segment_command_64
3881 #define section section_64
3882 #define nlist nlist_64
3885 #ifdef powerpc_HOST_ARCH
3886 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3888 struct mach_header *header = (struct mach_header *) oc->image;
3889 struct load_command *lc = (struct load_command *) (header + 1);
3892 for( i = 0; i < header->ncmds; i++ )
3894 if( lc->cmd == LC_SYMTAB )
3896 // Find out the first and last undefined external
3897 // symbol, so we don't have to allocate too many
3899 struct symtab_command *symLC = (struct symtab_command *) lc;
3900 unsigned min = symLC->nsyms, max = 0;
3901 struct nlist *nlist =
3902 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3904 for(i=0;i<symLC->nsyms;i++)
3906 if(nlist[i].n_type & N_STAB)
3908 else if(nlist[i].n_type & N_EXT)
3910 if((nlist[i].n_type & N_TYPE) == N_UNDF
3911 && (nlist[i].n_value == 0))
3921 return ocAllocateSymbolExtras(oc, max - min + 1, min);
3926 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3928 return ocAllocateSymbolExtras(oc,0,0);
3931 #ifdef x86_64_HOST_ARCH
3932 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3934 struct mach_header *header = (struct mach_header *) oc->image;
3935 struct load_command *lc = (struct load_command *) (header + 1);
3938 for( i = 0; i < header->ncmds; i++ )
3940 if( lc->cmd == LC_SYMTAB )
3942 // Just allocate one entry for every symbol
3943 struct symtab_command *symLC = (struct symtab_command *) lc;
3945 return ocAllocateSymbolExtras(oc, symLC->nsyms, 0);
3948 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3950 return ocAllocateSymbolExtras(oc,0,0);
3954 static int ocVerifyImage_MachO(ObjectCode* oc)
3956 char *image = (char*) oc->image;
3957 struct mach_header *header = (struct mach_header*) image;
3959 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
3960 if(header->magic != MH_MAGIC_64)
3963 if(header->magic != MH_MAGIC)
3966 // FIXME: do some more verifying here
3970 static int resolveImports(
3973 struct symtab_command *symLC,
3974 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3975 unsigned long *indirectSyms,
3976 struct nlist *nlist)
3979 size_t itemSize = 4;
3982 int isJumpTable = 0;
3983 if(!strcmp(sect->sectname,"__jump_table"))
3987 ASSERT(sect->reserved2 == itemSize);
3991 for(i=0; i*itemSize < sect->size;i++)
3993 // according to otool, reserved1 contains the first index into the indirect symbol table
3994 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3995 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3998 if((symbol->n_type & N_TYPE) == N_UNDF
3999 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
4000 addr = (void*) (symbol->n_value);
4002 addr = lookupSymbol(nm);
4005 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
4013 checkProddableBlock(oc,image + sect->offset + i*itemSize);
4014 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
4015 *(unsigned*)(image + sect->offset + i*itemSize + 1)
4016 = (char*)addr - (image + sect->offset + i*itemSize + 5);
4021 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
4022 ((void**)(image + sect->offset))[i] = addr;
4029 static unsigned long relocateAddress(
4032 struct section* sections,
4033 unsigned long address)
4036 for(i = 0; i < nSections; i++)
4038 if(sections[i].addr <= address
4039 && address < sections[i].addr + sections[i].size)
4041 return (unsigned long)oc->image
4042 + sections[i].offset + address - sections[i].addr;
4045 barf("Invalid Mach-O file:"
4046 "Address out of bounds while relocating object file");
4050 static int relocateSection(
4053 struct symtab_command *symLC, struct nlist *nlist,
4054 int nSections, struct section* sections, struct section *sect)
4056 struct relocation_info *relocs;
4059 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
4061 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
4063 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
4065 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
4069 relocs = (struct relocation_info*) (image + sect->reloff);
4073 #ifdef x86_64_HOST_ARCH
4074 struct relocation_info *reloc = &relocs[i];
4076 char *thingPtr = image + sect->offset + reloc->r_address;
4080 int type = reloc->r_type;
4082 checkProddableBlock(oc,thingPtr);
4083 switch(reloc->r_length)
4086 thing = *(uint8_t*)thingPtr;
4087 baseValue = (uint64_t)thingPtr + 1;
4090 thing = *(uint16_t*)thingPtr;
4091 baseValue = (uint64_t)thingPtr + 2;
4094 thing = *(uint32_t*)thingPtr;
4095 baseValue = (uint64_t)thingPtr + 4;
4098 thing = *(uint64_t*)thingPtr;
4099 baseValue = (uint64_t)thingPtr + 8;
4102 barf("Unknown size.");
4105 if(type == X86_64_RELOC_GOT
4106 || type == X86_64_RELOC_GOT_LOAD)
4108 ASSERT(reloc->r_extern);
4109 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)->addr;
4111 type = X86_64_RELOC_SIGNED;
4113 else if(reloc->r_extern)
4115 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4116 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4117 if(symbol->n_value == 0)
4118 value = (uint64_t) lookupSymbol(nm);
4120 value = relocateAddress(oc, nSections, sections,
4125 value = sections[reloc->r_symbolnum-1].offset
4126 - sections[reloc->r_symbolnum-1].addr
4130 if(type == X86_64_RELOC_BRANCH)
4132 if((int32_t)(value - baseValue) != (int64_t)(value - baseValue))
4134 ASSERT(reloc->r_extern);
4135 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)
4138 ASSERT((int32_t)(value - baseValue) == (int64_t)(value - baseValue));
4139 type = X86_64_RELOC_SIGNED;
4144 case X86_64_RELOC_UNSIGNED:
4145 ASSERT(!reloc->r_pcrel);
4148 case X86_64_RELOC_SIGNED:
4149 ASSERT(reloc->r_pcrel);
4150 thing += value - baseValue;
4152 case X86_64_RELOC_SUBTRACTOR:
4153 ASSERT(!reloc->r_pcrel);
4157 barf("unkown relocation");
4160 switch(reloc->r_length)
4163 *(uint8_t*)thingPtr = thing;
4166 *(uint16_t*)thingPtr = thing;
4169 *(uint32_t*)thingPtr = thing;
4172 *(uint64_t*)thingPtr = thing;
4176 if(relocs[i].r_address & R_SCATTERED)
4178 struct scattered_relocation_info *scat =
4179 (struct scattered_relocation_info*) &relocs[i];
4183 if(scat->r_length == 2)
4185 unsigned long word = 0;
4186 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
4187 checkProddableBlock(oc,wordPtr);
4189 // Note on relocation types:
4190 // i386 uses the GENERIC_RELOC_* types,
4191 // while ppc uses special PPC_RELOC_* types.
4192 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
4193 // in both cases, all others are different.
4194 // Therefore, we use GENERIC_RELOC_VANILLA
4195 // and GENERIC_RELOC_PAIR instead of the PPC variants,
4196 // and use #ifdefs for the other types.
4198 // Step 1: Figure out what the relocated value should be
4199 if(scat->r_type == GENERIC_RELOC_VANILLA)
4201 word = *wordPtr + (unsigned long) relocateAddress(
4208 #ifdef powerpc_HOST_ARCH
4209 else if(scat->r_type == PPC_RELOC_SECTDIFF
4210 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
4211 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
4212 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
4214 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
4217 struct scattered_relocation_info *pair =
4218 (struct scattered_relocation_info*) &relocs[i+1];
4220 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
4221 barf("Invalid Mach-O file: "
4222 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
4224 word = (unsigned long)
4225 (relocateAddress(oc, nSections, sections, scat->r_value)
4226 - relocateAddress(oc, nSections, sections, pair->r_value));
4229 #ifdef powerpc_HOST_ARCH
4230 else if(scat->r_type == PPC_RELOC_HI16
4231 || scat->r_type == PPC_RELOC_LO16
4232 || scat->r_type == PPC_RELOC_HA16
4233 || scat->r_type == PPC_RELOC_LO14)
4234 { // these are generated by label+offset things
4235 struct relocation_info *pair = &relocs[i+1];
4236 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
4237 barf("Invalid Mach-O file: "
4238 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
4240 if(scat->r_type == PPC_RELOC_LO16)
4242 word = ((unsigned short*) wordPtr)[1];
4243 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4245 else if(scat->r_type == PPC_RELOC_LO14)
4247 barf("Unsupported Relocation: PPC_RELOC_LO14");
4248 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
4249 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4251 else if(scat->r_type == PPC_RELOC_HI16)
4253 word = ((unsigned short*) wordPtr)[1] << 16;
4254 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4256 else if(scat->r_type == PPC_RELOC_HA16)
4258 word = ((unsigned short*) wordPtr)[1] << 16;
4259 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4263 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4270 continue; // ignore the others
4272 #ifdef powerpc_HOST_ARCH
4273 if(scat->r_type == GENERIC_RELOC_VANILLA
4274 || scat->r_type == PPC_RELOC_SECTDIFF)
4276 if(scat->r_type == GENERIC_RELOC_VANILLA
4277 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4282 #ifdef powerpc_HOST_ARCH
4283 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4285 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4287 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4289 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4291 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4293 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4294 + ((word & (1<<15)) ? 1 : 0);
4300 continue; // FIXME: I hope it's OK to ignore all the others.
4304 struct relocation_info *reloc = &relocs[i];
4305 if(reloc->r_pcrel && !reloc->r_extern)
4308 if(reloc->r_length == 2)
4310 unsigned long word = 0;
4311 #ifdef powerpc_HOST_ARCH
4312 unsigned long jumpIsland = 0;
4313 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4314 // to avoid warning and to catch
4318 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4319 checkProddableBlock(oc,wordPtr);
4321 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4325 #ifdef powerpc_HOST_ARCH
4326 else if(reloc->r_type == PPC_RELOC_LO16)
4328 word = ((unsigned short*) wordPtr)[1];
4329 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4331 else if(reloc->r_type == PPC_RELOC_HI16)
4333 word = ((unsigned short*) wordPtr)[1] << 16;
4334 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4336 else if(reloc->r_type == PPC_RELOC_HA16)
4338 word = ((unsigned short*) wordPtr)[1] << 16;
4339 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4341 else if(reloc->r_type == PPC_RELOC_BR24)
4344 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4348 if(!reloc->r_extern)
4351 sections[reloc->r_symbolnum-1].offset
4352 - sections[reloc->r_symbolnum-1].addr
4359 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4360 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4361 void *symbolAddress = lookupSymbol(nm);
4364 errorBelch("\nunknown symbol `%s'", nm);
4370 #ifdef powerpc_HOST_ARCH
4371 // In the .o file, this should be a relative jump to NULL
4372 // and we'll change it to a relative jump to the symbol
4373 ASSERT(word + reloc->r_address == 0);
4374 jumpIsland = (unsigned long)
4375 &makeSymbolExtra(oc,
4377 (unsigned long) symbolAddress)
4381 offsetToJumpIsland = word + jumpIsland
4382 - (((long)image) + sect->offset - sect->addr);
4385 word += (unsigned long) symbolAddress
4386 - (((long)image) + sect->offset - sect->addr);
4390 word += (unsigned long) symbolAddress;
4394 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4399 #ifdef powerpc_HOST_ARCH
4400 else if(reloc->r_type == PPC_RELOC_LO16)
4402 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4405 else if(reloc->r_type == PPC_RELOC_HI16)
4407 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4410 else if(reloc->r_type == PPC_RELOC_HA16)
4412 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4413 + ((word & (1<<15)) ? 1 : 0);
4416 else if(reloc->r_type == PPC_RELOC_BR24)
4418 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4420 // The branch offset is too large.
4421 // Therefore, we try to use a jump island.
4424 barf("unconditional relative branch out of range: "
4425 "no jump island available");
4428 word = offsetToJumpIsland;
4429 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4430 barf("unconditional relative branch out of range: "
4431 "jump island out of range");
4433 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4438 barf("\nunknown relocation %d",reloc->r_type);
4446 static int ocGetNames_MachO(ObjectCode* oc)
4448 char *image = (char*) oc->image;
4449 struct mach_header *header = (struct mach_header*) image;
4450 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4451 unsigned i,curSymbol = 0;
4452 struct segment_command *segLC = NULL;
4453 struct section *sections;
4454 struct symtab_command *symLC = NULL;
4455 struct nlist *nlist;
4456 unsigned long commonSize = 0;
4457 char *commonStorage = NULL;
4458 unsigned long commonCounter;
4460 for(i=0;i<header->ncmds;i++)
4462 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4463 segLC = (struct segment_command*) lc;
4464 else if(lc->cmd == LC_SYMTAB)
4465 symLC = (struct symtab_command*) lc;
4466 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4469 sections = (struct section*) (segLC+1);
4470 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4474 barf("ocGetNames_MachO: no segment load command");
4476 for(i=0;i<segLC->nsects;i++)
4478 if(sections[i].size == 0)
4481 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4483 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4484 "ocGetNames_MachO(common symbols)");
4485 sections[i].offset = zeroFillArea - image;
4488 if(!strcmp(sections[i].sectname,"__text"))
4489 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4490 (void*) (image + sections[i].offset),
4491 (void*) (image + sections[i].offset + sections[i].size));
4492 else if(!strcmp(sections[i].sectname,"__const"))
4493 addSection(oc, SECTIONKIND_RWDATA,
4494 (void*) (image + sections[i].offset),
4495 (void*) (image + sections[i].offset + sections[i].size));
4496 else if(!strcmp(sections[i].sectname,"__data"))
4497 addSection(oc, SECTIONKIND_RWDATA,
4498 (void*) (image + sections[i].offset),
4499 (void*) (image + sections[i].offset + sections[i].size));
4500 else if(!strcmp(sections[i].sectname,"__bss")
4501 || !strcmp(sections[i].sectname,"__common"))
4502 addSection(oc, SECTIONKIND_RWDATA,
4503 (void*) (image + sections[i].offset),
4504 (void*) (image + sections[i].offset + sections[i].size));
4506 addProddableBlock(oc, (void*) (image + sections[i].offset),
4510 // count external symbols defined here
4514 for(i=0;i<symLC->nsyms;i++)
4516 if(nlist[i].n_type & N_STAB)
4518 else if(nlist[i].n_type & N_EXT)
4520 if((nlist[i].n_type & N_TYPE) == N_UNDF
4521 && (nlist[i].n_value != 0))
4523 commonSize += nlist[i].n_value;
4526 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4531 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4532 "ocGetNames_MachO(oc->symbols)");
4536 for(i=0;i<symLC->nsyms;i++)
4538 if(nlist[i].n_type & N_STAB)
4540 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4542 if(nlist[i].n_type & N_EXT)
4544 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4545 if((nlist[i].n_desc & N_WEAK_DEF) && lookupSymbol(nm))
4546 ; // weak definition, and we already have a definition
4549 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4551 + sections[nlist[i].n_sect-1].offset
4552 - sections[nlist[i].n_sect-1].addr
4553 + nlist[i].n_value);
4554 oc->symbols[curSymbol++] = nm;
4561 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4562 commonCounter = (unsigned long)commonStorage;
4565 for(i=0;i<symLC->nsyms;i++)
4567 if((nlist[i].n_type & N_TYPE) == N_UNDF
4568 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4570 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4571 unsigned long sz = nlist[i].n_value;
4573 nlist[i].n_value = commonCounter;
4575 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4576 (void*)commonCounter);
4577 oc->symbols[curSymbol++] = nm;
4579 commonCounter += sz;
4586 static int ocResolve_MachO(ObjectCode* oc)
4588 char *image = (char*) oc->image;
4589 struct mach_header *header = (struct mach_header*) image;
4590 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4592 struct segment_command *segLC = NULL;
4593 struct section *sections;
4594 struct symtab_command *symLC = NULL;
4595 struct dysymtab_command *dsymLC = NULL;
4596 struct nlist *nlist;
4598 for(i=0;i<header->ncmds;i++)
4600 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4601 segLC = (struct segment_command*) lc;
4602 else if(lc->cmd == LC_SYMTAB)
4603 symLC = (struct symtab_command*) lc;
4604 else if(lc->cmd == LC_DYSYMTAB)
4605 dsymLC = (struct dysymtab_command*) lc;
4606 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4609 sections = (struct section*) (segLC+1);
4610 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4615 unsigned long *indirectSyms
4616 = (unsigned long*) (image + dsymLC->indirectsymoff);
4618 for(i=0;i<segLC->nsects;i++)
4620 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4621 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4622 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4624 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4627 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4628 || !strcmp(sections[i].sectname,"__pointers"))
4630 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4633 else if(!strcmp(sections[i].sectname,"__jump_table"))
4635 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4641 for(i=0;i<segLC->nsects;i++)
4643 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4647 #if defined (powerpc_HOST_ARCH)
4648 ocFlushInstructionCache( oc );
4654 #ifdef powerpc_HOST_ARCH
4656 * The Mach-O object format uses leading underscores. But not everywhere.
4657 * There is a small number of runtime support functions defined in
4658 * libcc_dynamic.a whose name does not have a leading underscore.
4659 * As a consequence, we can't get their address from C code.
4660 * We have to use inline assembler just to take the address of a function.
4664 static void machoInitSymbolsWithoutUnderscore()
4666 extern void* symbolsWithoutUnderscore[];
4667 void **p = symbolsWithoutUnderscore;
4668 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4671 #define SymI_NeedsProto(x) \
4672 __asm__ volatile(".long " # x);
4674 RTS_MACHO_NOUNDERLINE_SYMBOLS
4676 __asm__ volatile(".text");
4679 #define SymI_NeedsProto(x) \
4680 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4682 RTS_MACHO_NOUNDERLINE_SYMBOLS
4689 * Figure out by how much to shift the entire Mach-O file in memory
4690 * when loading so that its single segment ends up 16-byte-aligned
4692 static int machoGetMisalignment( FILE * f )
4694 struct mach_header header;
4697 fread(&header, sizeof(header), 1, f);
4700 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
4701 if(header.magic != MH_MAGIC_64)
4704 if(header.magic != MH_MAGIC)
4708 misalignment = (header.sizeofcmds + sizeof(header))
4711 return misalignment ? (16 - misalignment) : 0;