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(__stg_EAGER_BLACKHOLE_info) \
767 SymI_HasProto(awakenBlockedQueue) \
768 SymI_HasProto(startTimer) \
769 SymI_HasProto(stg_CHARLIKE_closure) \
770 SymI_HasProto(stg_MVAR_CLEAN_info) \
771 SymI_HasProto(stg_MVAR_DIRTY_info) \
772 SymI_HasProto(stg_IND_STATIC_info) \
773 SymI_HasProto(stg_INTLIKE_closure) \
774 SymI_HasProto(stg_MUT_ARR_PTRS_DIRTY_info) \
775 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN_info) \
776 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN0_info) \
777 SymI_HasProto(stg_WEAK_info) \
778 SymI_HasProto(stg_ap_v_info) \
779 SymI_HasProto(stg_ap_f_info) \
780 SymI_HasProto(stg_ap_d_info) \
781 SymI_HasProto(stg_ap_l_info) \
782 SymI_HasProto(stg_ap_n_info) \
783 SymI_HasProto(stg_ap_p_info) \
784 SymI_HasProto(stg_ap_pv_info) \
785 SymI_HasProto(stg_ap_pp_info) \
786 SymI_HasProto(stg_ap_ppv_info) \
787 SymI_HasProto(stg_ap_ppp_info) \
788 SymI_HasProto(stg_ap_pppv_info) \
789 SymI_HasProto(stg_ap_pppp_info) \
790 SymI_HasProto(stg_ap_ppppp_info) \
791 SymI_HasProto(stg_ap_pppppp_info) \
792 SymI_HasProto(stg_ap_0_fast) \
793 SymI_HasProto(stg_ap_v_fast) \
794 SymI_HasProto(stg_ap_f_fast) \
795 SymI_HasProto(stg_ap_d_fast) \
796 SymI_HasProto(stg_ap_l_fast) \
797 SymI_HasProto(stg_ap_n_fast) \
798 SymI_HasProto(stg_ap_p_fast) \
799 SymI_HasProto(stg_ap_pv_fast) \
800 SymI_HasProto(stg_ap_pp_fast) \
801 SymI_HasProto(stg_ap_ppv_fast) \
802 SymI_HasProto(stg_ap_ppp_fast) \
803 SymI_HasProto(stg_ap_pppv_fast) \
804 SymI_HasProto(stg_ap_pppp_fast) \
805 SymI_HasProto(stg_ap_ppppp_fast) \
806 SymI_HasProto(stg_ap_pppppp_fast) \
807 SymI_HasProto(stg_ap_1_upd_info) \
808 SymI_HasProto(stg_ap_2_upd_info) \
809 SymI_HasProto(stg_ap_3_upd_info) \
810 SymI_HasProto(stg_ap_4_upd_info) \
811 SymI_HasProto(stg_ap_5_upd_info) \
812 SymI_HasProto(stg_ap_6_upd_info) \
813 SymI_HasProto(stg_ap_7_upd_info) \
814 SymI_HasProto(stg_exit) \
815 SymI_HasProto(stg_sel_0_upd_info) \
816 SymI_HasProto(stg_sel_10_upd_info) \
817 SymI_HasProto(stg_sel_11_upd_info) \
818 SymI_HasProto(stg_sel_12_upd_info) \
819 SymI_HasProto(stg_sel_13_upd_info) \
820 SymI_HasProto(stg_sel_14_upd_info) \
821 SymI_HasProto(stg_sel_15_upd_info) \
822 SymI_HasProto(stg_sel_1_upd_info) \
823 SymI_HasProto(stg_sel_2_upd_info) \
824 SymI_HasProto(stg_sel_3_upd_info) \
825 SymI_HasProto(stg_sel_4_upd_info) \
826 SymI_HasProto(stg_sel_5_upd_info) \
827 SymI_HasProto(stg_sel_6_upd_info) \
828 SymI_HasProto(stg_sel_7_upd_info) \
829 SymI_HasProto(stg_sel_8_upd_info) \
830 SymI_HasProto(stg_sel_9_upd_info) \
831 SymI_HasProto(stg_upd_frame_info) \
832 SymI_HasProto(suspendThread) \
833 SymI_HasProto(takeMVarzh_fast) \
834 SymI_HasProto(threadStatuszh_fast) \
835 SymI_HasProto(timesIntegerzh_fast) \
836 SymI_HasProto(tryPutMVarzh_fast) \
837 SymI_HasProto(tryTakeMVarzh_fast) \
838 SymI_HasProto(unblockAsyncExceptionszh_fast) \
839 SymI_HasProto(unloadObj) \
840 SymI_HasProto(unsafeThawArrayzh_fast) \
841 SymI_HasProto(waitReadzh_fast) \
842 SymI_HasProto(waitWritezh_fast) \
843 SymI_HasProto(word2Integerzh_fast) \
844 SymI_HasProto(writeTVarzh_fast) \
845 SymI_HasProto(xorIntegerzh_fast) \
846 SymI_HasProto(yieldzh_fast) \
847 SymI_NeedsProto(stg_interp_constr_entry) \
848 SymI_HasProto(allocateExec) \
849 SymI_HasProto(freeExec) \
850 SymI_HasProto(getAllocations) \
851 SymI_HasProto(revertCAFs) \
852 SymI_HasProto(RtsFlags) \
853 SymI_NeedsProto(rts_breakpoint_io_action) \
854 SymI_NeedsProto(rts_stop_next_breakpoint) \
855 SymI_NeedsProto(rts_stop_on_exception) \
856 SymI_HasProto(stopTimer) \
857 SymI_HasProto(n_capabilities) \
858 RTS_USER_SIGNALS_SYMBOLS
860 #ifdef SUPPORT_LONG_LONGS
861 #define RTS_LONG_LONG_SYMS \
862 SymI_HasProto(int64ToIntegerzh_fast) \
863 SymI_HasProto(word64ToIntegerzh_fast)
865 #define RTS_LONG_LONG_SYMS /* nothing */
868 // 64-bit support functions in libgcc.a
869 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
870 #define RTS_LIBGCC_SYMBOLS \
871 SymI_NeedsProto(__divdi3) \
872 SymI_NeedsProto(__udivdi3) \
873 SymI_NeedsProto(__moddi3) \
874 SymI_NeedsProto(__umoddi3) \
875 SymI_NeedsProto(__muldi3) \
876 SymI_NeedsProto(__ashldi3) \
877 SymI_NeedsProto(__ashrdi3) \
878 SymI_NeedsProto(__lshrdi3) \
879 SymI_NeedsProto(__eprintf)
880 #elif defined(ia64_HOST_ARCH)
881 #define RTS_LIBGCC_SYMBOLS \
882 SymI_NeedsProto(__divdi3) \
883 SymI_NeedsProto(__udivdi3) \
884 SymI_NeedsProto(__moddi3) \
885 SymI_NeedsProto(__umoddi3) \
886 SymI_NeedsProto(__divsf3) \
887 SymI_NeedsProto(__divdf3)
889 #define RTS_LIBGCC_SYMBOLS
892 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
893 // Symbols that don't have a leading underscore
894 // on Mac OS X. They have to receive special treatment,
895 // see machoInitSymbolsWithoutUnderscore()
896 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
897 SymI_NeedsProto(saveFP) \
898 SymI_NeedsProto(restFP)
901 /* entirely bogus claims about types of these symbols */
902 #define SymI_NeedsProto(vvv) extern void vvv(void);
903 #if defined(__PIC__) && defined(mingw32_TARGET_OS)
904 #define SymE_HasProto(vvv) SymE_HasProto(vvv);
905 #define SymE_NeedsProto(vvv) extern void _imp__ ## vvv (void);
907 #define SymE_NeedsProto(vvv) SymI_NeedsProto(vvv);
908 #define SymE_HasProto(vvv) SymI_HasProto(vvv)
910 #define SymI_HasProto(vvv) /**/
911 #define SymI_HasProto_redirect(vvv,xxx) /**/
915 RTS_POSIX_ONLY_SYMBOLS
916 RTS_MINGW_ONLY_SYMBOLS
917 RTS_CYGWIN_ONLY_SYMBOLS
918 RTS_DARWIN_ONLY_SYMBOLS
921 #undef SymI_NeedsProto
923 #undef SymI_HasProto_redirect
925 #undef SymE_NeedsProto
927 #ifdef LEADING_UNDERSCORE
928 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
930 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
933 #define SymI_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
935 #define SymE_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
936 (void*)DLL_IMPORT_DATA_REF(vvv) },
938 #define SymI_NeedsProto(vvv) SymI_HasProto(vvv)
939 #define SymE_NeedsProto(vvv) SymE_HasProto(vvv)
941 // SymI_HasProto_redirect allows us to redirect references to one symbol to
942 // another symbol. See newCAF/newDynCAF for an example.
943 #define SymI_HasProto_redirect(vvv,xxx) \
944 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
947 static RtsSymbolVal rtsSyms[] = {
951 RTS_POSIX_ONLY_SYMBOLS
952 RTS_MINGW_ONLY_SYMBOLS
953 RTS_CYGWIN_ONLY_SYMBOLS
954 RTS_DARWIN_ONLY_SYMBOLS
957 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
958 // dyld stub code contains references to this,
959 // but it should never be called because we treat
960 // lazy pointers as nonlazy.
961 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
963 { 0, 0 } /* sentinel */
968 /* -----------------------------------------------------------------------------
969 * Insert symbols into hash tables, checking for duplicates.
972 static void ghciInsertStrHashTable ( char* obj_name,
978 if (lookupHashTable(table, (StgWord)key) == NULL)
980 insertStrHashTable(table, (StgWord)key, data);
985 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
987 "whilst processing object file\n"
989 "This could be caused by:\n"
990 " * Loading two different object files which export the same symbol\n"
991 " * Specifying the same object file twice on the GHCi command line\n"
992 " * An incorrect `package.conf' entry, causing some object to be\n"
994 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
1001 /* -----------------------------------------------------------------------------
1002 * initialize the object linker
1006 static int linker_init_done = 0 ;
1008 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1009 static void *dl_prog_handle;
1017 /* Make initLinker idempotent, so we can call it
1018 before evey relevant operation; that means we
1019 don't need to initialise the linker separately */
1020 if (linker_init_done == 1) { return; } else {
1021 linker_init_done = 1;
1024 stablehash = allocStrHashTable();
1025 symhash = allocStrHashTable();
1027 /* populate the symbol table with stuff from the RTS */
1028 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
1029 ghciInsertStrHashTable("(GHCi built-in symbols)",
1030 symhash, sym->lbl, sym->addr);
1032 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1033 machoInitSymbolsWithoutUnderscore();
1036 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1037 # if defined(RTLD_DEFAULT)
1038 dl_prog_handle = RTLD_DEFAULT;
1040 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
1041 # endif /* RTLD_DEFAULT */
1044 #if defined(x86_64_HOST_ARCH)
1045 if (RtsFlags.MiscFlags.linkerMemBase != 0) {
1046 // User-override for mmap_32bit_base
1047 mmap_32bit_base = (void*)RtsFlags.MiscFlags.linkerMemBase;
1052 /* -----------------------------------------------------------------------------
1053 * Loading DLL or .so dynamic libraries
1054 * -----------------------------------------------------------------------------
1056 * Add a DLL from which symbols may be found. In the ELF case, just
1057 * do RTLD_GLOBAL-style add, so no further messing around needs to
1058 * happen in order that symbols in the loaded .so are findable --
1059 * lookupSymbol() will subsequently see them by dlsym on the program's
1060 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
1062 * In the PEi386 case, open the DLLs and put handles to them in a
1063 * linked list. When looking for a symbol, try all handles in the
1064 * list. This means that we need to load even DLLs that are guaranteed
1065 * to be in the ghc.exe image already, just so we can get a handle
1066 * to give to loadSymbol, so that we can find the symbols. For such
1067 * libraries, the LoadLibrary call should be a no-op except for returning
1072 #if defined(OBJFORMAT_PEi386)
1073 /* A record for storing handles into DLLs. */
1078 struct _OpenedDLL* next;
1083 /* A list thereof. */
1084 static OpenedDLL* opened_dlls = NULL;
1088 addDLL( char *dll_name )
1090 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1091 /* ------------------- ELF DLL loader ------------------- */
1097 // omitted: RTLD_NOW
1098 // see http://www.haskell.org/pipermail/cvs-ghc/2007-September/038570.html
1099 hdl= dlopen(dll_name, RTLD_LAZY | RTLD_GLOBAL);
1102 /* dlopen failed; return a ptr to the error msg. */
1104 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1111 # elif defined(OBJFORMAT_PEi386)
1112 /* ------------------- Win32 DLL loader ------------------- */
1120 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1122 /* See if we've already got it, and ignore if so. */
1123 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1124 if (0 == strcmp(o_dll->name, dll_name))
1128 /* The file name has no suffix (yet) so that we can try
1129 both foo.dll and foo.drv
1131 The documentation for LoadLibrary says:
1132 If no file name extension is specified in the lpFileName
1133 parameter, the default library extension .dll is
1134 appended. However, the file name string can include a trailing
1135 point character (.) to indicate that the module name has no
1138 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1139 sprintf(buf, "%s.DLL", dll_name);
1140 instance = LoadLibrary(buf);
1141 if (instance == NULL) {
1142 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1143 // KAA: allow loading of drivers (like winspool.drv)
1144 sprintf(buf, "%s.DRV", dll_name);
1145 instance = LoadLibrary(buf);
1146 if (instance == NULL) {
1147 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1148 // #1883: allow loading of unix-style libfoo.dll DLLs
1149 sprintf(buf, "lib%s.DLL", dll_name);
1150 instance = LoadLibrary(buf);
1151 if (instance == NULL) {
1158 /* Add this DLL to the list of DLLs in which to search for symbols. */
1159 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1160 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1161 strcpy(o_dll->name, dll_name);
1162 o_dll->instance = instance;
1163 o_dll->next = opened_dlls;
1164 opened_dlls = o_dll;
1170 sysErrorBelch(dll_name);
1172 /* LoadLibrary failed; return a ptr to the error msg. */
1173 return "addDLL: could not load DLL";
1176 barf("addDLL: not implemented on this platform");
1180 /* -----------------------------------------------------------------------------
1181 * insert a stable symbol in the hash table
1185 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1187 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1191 /* -----------------------------------------------------------------------------
1192 * insert a symbol in the hash table
1195 insertSymbol(char* obj_name, char* key, void* data)
1197 ghciInsertStrHashTable(obj_name, symhash, key, data);
1200 /* -----------------------------------------------------------------------------
1201 * lookup a symbol in the hash table
1204 lookupSymbol( char *lbl )
1208 ASSERT(symhash != NULL);
1209 val = lookupStrHashTable(symhash, lbl);
1212 # if defined(OBJFORMAT_ELF)
1213 return dlsym(dl_prog_handle, lbl);
1214 # elif defined(OBJFORMAT_MACHO)
1216 /* On OS X 10.3 and later, we use dlsym instead of the old legacy
1219 HACK: On OS X, global symbols are prefixed with an underscore.
1220 However, dlsym wants us to omit the leading underscore from the
1221 symbol name. For now, we simply strip it off here (and ONLY
1224 ASSERT(lbl[0] == '_');
1225 return dlsym(dl_prog_handle, lbl+1);
1227 if(NSIsSymbolNameDefined(lbl)) {
1228 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1229 return NSAddressOfSymbol(symbol);
1233 # endif /* HAVE_DLFCN_H */
1234 # elif defined(OBJFORMAT_PEi386)
1237 sym = lookupSymbolInDLLs(lbl);
1238 if (sym != NULL) { return sym; };
1240 // Also try looking up the symbol without the @N suffix. Some
1241 // DLLs have the suffixes on their symbols, some don't.
1242 zapTrailingAtSign ( lbl );
1243 sym = lookupSymbolInDLLs(lbl);
1244 if (sym != NULL) { return sym; };
1256 /* -----------------------------------------------------------------------------
1257 * Debugging aid: look in GHCi's object symbol tables for symbols
1258 * within DELTA bytes of the specified address, and show their names.
1261 void ghci_enquire ( char* addr );
1263 void ghci_enquire ( char* addr )
1268 const int DELTA = 64;
1273 for (oc = objects; oc; oc = oc->next) {
1274 for (i = 0; i < oc->n_symbols; i++) {
1275 sym = oc->symbols[i];
1276 if (sym == NULL) continue;
1279 a = lookupStrHashTable(symhash, sym);
1282 // debugBelch("ghci_enquire: can't find %s\n", sym);
1284 else if (addr-DELTA <= a && a <= addr+DELTA) {
1285 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1292 #ifdef ia64_HOST_ARCH
1293 static unsigned int PLTSize(void);
1298 mmapForLinker (size_t bytes, nat flags, int fd)
1300 void *map_addr = NULL;
1303 #if defined(x86_64_HOST_ARCH)
1306 if (mmap_32bit_base != 0) {
1307 map_addr = mmap_32bit_base;
1311 result = mmap(map_addr, bytes, PROT_EXEC|PROT_READ|PROT_WRITE,
1312 MAP_PRIVATE|TRY_MAP_32BIT|flags, fd, 0);
1314 if (result == MAP_FAILED) {
1315 sysErrorBelch("mmap");
1316 stg_exit(EXIT_FAILURE);
1319 #if defined(x86_64_HOST_ARCH)
1320 if (mmap_32bit_base != 0) {
1321 if (result == map_addr) {
1322 mmap_32bit_base = map_addr + bytes;
1324 if ((W_)result > 0x80000000) {
1325 // oops, we were given memory over 2Gb
1326 // ... try allocating memory somewhere else?;
1327 barf("loadObj: failed to mmap() memory below 2Gb; asked for %lu bytes at %p, got %p. Try specifying an address with +RTS -xm<addr> -RTS", bytes, map_addr, result);
1329 // hmm, we were given memory somewhere else, but it's
1330 // still under 2Gb so we can use it. Next time, ask
1331 // for memory right after the place we just got some
1332 mmap_32bit_base = (void*)result + bytes;
1336 if ((W_)result > 0x80000000) {
1337 // oops, we were given memory over 2Gb
1338 // ... try allocating memory somewhere else?;
1339 debugTrace(DEBUG_linker,"MAP_32BIT didn't work; gave us %lu bytes at 0x%p", bytes, result);
1340 munmap(result, bytes);
1342 // Set a base address and try again... (guess: 1Gb)
1343 mmap_32bit_base = (void*)0x40000000;
1353 /* -----------------------------------------------------------------------------
1354 * Load an obj (populate the global symbol table, but don't resolve yet)
1356 * Returns: 1 if ok, 0 on error.
1359 loadObj( char *path )
1371 /* debugBelch("loadObj %s\n", path ); */
1373 /* Check that we haven't already loaded this object.
1374 Ignore requests to load multiple times */
1378 for (o = objects; o; o = o->next) {
1379 if (0 == strcmp(o->fileName, path)) {
1381 break; /* don't need to search further */
1385 IF_DEBUG(linker, debugBelch(
1386 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1387 "same object file twice:\n"
1389 "GHCi will ignore this, but be warned.\n"
1391 return 1; /* success */
1395 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1397 # if defined(OBJFORMAT_ELF)
1398 oc->formatName = "ELF";
1399 # elif defined(OBJFORMAT_PEi386)
1400 oc->formatName = "PEi386";
1401 # elif defined(OBJFORMAT_MACHO)
1402 oc->formatName = "Mach-O";
1405 barf("loadObj: not implemented on this platform");
1408 r = stat(path, &st);
1409 if (r == -1) { return 0; }
1411 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1412 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1413 strcpy(oc->fileName, path);
1415 oc->fileSize = st.st_size;
1417 oc->sections = NULL;
1418 oc->proddables = NULL;
1420 /* chain it onto the list of objects */
1425 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1427 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1429 #if defined(openbsd_HOST_OS)
1430 fd = open(path, O_RDONLY, S_IRUSR);
1432 fd = open(path, O_RDONLY);
1435 barf("loadObj: can't open `%s'", path);
1437 pagesize = getpagesize();
1439 #ifdef ia64_HOST_ARCH
1440 /* The PLT needs to be right before the object */
1441 n = ROUND_UP(PLTSize(), pagesize);
1442 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1443 if (oc->plt == MAP_FAILED)
1444 barf("loadObj: can't allocate PLT");
1447 map_addr = oc->plt + n;
1450 n = ROUND_UP(oc->fileSize, pagesize);
1452 #ifdef ia64_HOST_ARCH
1453 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1454 MAP_PRIVATE|TRY_MAP_32BIT, fd, 0);
1455 if (oc->image == MAP_FAILED)
1456 barf("loadObj: can't map `%s'", path);
1458 oc->image = mmapForLinker(n, 0, fd);
1463 #else /* !USE_MMAP */
1465 /* load the image into memory */
1466 f = fopen(path, "rb");
1468 barf("loadObj: can't read `%s'", path);
1470 # if defined(mingw32_HOST_OS)
1471 // TODO: We would like to use allocateExec here, but allocateExec
1472 // cannot currently allocate blocks large enough.
1473 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1474 PAGE_EXECUTE_READWRITE);
1475 # elif defined(darwin_HOST_OS)
1476 // In a Mach-O .o file, all sections can and will be misaligned
1477 // if the total size of the headers is not a multiple of the
1478 // desired alignment. This is fine for .o files that only serve
1479 // as input for the static linker, but it's not fine for us,
1480 // as SSE (used by gcc for floating point) and Altivec require
1481 // 16-byte alignment.
1482 // We calculate the correct alignment from the header before
1483 // reading the file, and then we misalign oc->image on purpose so
1484 // that the actual sections end up aligned again.
1485 oc->misalignment = machoGetMisalignment(f);
1486 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1487 oc->image += oc->misalignment;
1489 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1492 n = fread ( oc->image, 1, oc->fileSize, f );
1493 if (n != oc->fileSize)
1494 barf("loadObj: error whilst reading `%s'", path);
1497 #endif /* USE_MMAP */
1499 # if defined(OBJFORMAT_MACHO) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1500 r = ocAllocateSymbolExtras_MachO ( oc );
1501 if (!r) { return r; }
1502 # elif defined(OBJFORMAT_ELF) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1503 r = ocAllocateSymbolExtras_ELF ( oc );
1504 if (!r) { return r; }
1507 /* verify the in-memory image */
1508 # if defined(OBJFORMAT_ELF)
1509 r = ocVerifyImage_ELF ( oc );
1510 # elif defined(OBJFORMAT_PEi386)
1511 r = ocVerifyImage_PEi386 ( oc );
1512 # elif defined(OBJFORMAT_MACHO)
1513 r = ocVerifyImage_MachO ( oc );
1515 barf("loadObj: no verify method");
1517 if (!r) { return r; }
1519 /* build the symbol list for this image */
1520 # if defined(OBJFORMAT_ELF)
1521 r = ocGetNames_ELF ( oc );
1522 # elif defined(OBJFORMAT_PEi386)
1523 r = ocGetNames_PEi386 ( oc );
1524 # elif defined(OBJFORMAT_MACHO)
1525 r = ocGetNames_MachO ( oc );
1527 barf("loadObj: no getNames method");
1529 if (!r) { return r; }
1531 /* loaded, but not resolved yet */
1532 oc->status = OBJECT_LOADED;
1537 /* -----------------------------------------------------------------------------
1538 * resolve all the currently unlinked objects in memory
1540 * Returns: 1 if ok, 0 on error.
1550 for (oc = objects; oc; oc = oc->next) {
1551 if (oc->status != OBJECT_RESOLVED) {
1552 # if defined(OBJFORMAT_ELF)
1553 r = ocResolve_ELF ( oc );
1554 # elif defined(OBJFORMAT_PEi386)
1555 r = ocResolve_PEi386 ( oc );
1556 # elif defined(OBJFORMAT_MACHO)
1557 r = ocResolve_MachO ( oc );
1559 barf("resolveObjs: not implemented on this platform");
1561 if (!r) { return r; }
1562 oc->status = OBJECT_RESOLVED;
1568 /* -----------------------------------------------------------------------------
1569 * delete an object from the pool
1572 unloadObj( char *path )
1574 ObjectCode *oc, *prev;
1576 ASSERT(symhash != NULL);
1577 ASSERT(objects != NULL);
1582 for (oc = objects; oc; prev = oc, oc = oc->next) {
1583 if (!strcmp(oc->fileName,path)) {
1585 /* Remove all the mappings for the symbols within this
1590 for (i = 0; i < oc->n_symbols; i++) {
1591 if (oc->symbols[i] != NULL) {
1592 removeStrHashTable(symhash, oc->symbols[i], NULL);
1600 prev->next = oc->next;
1603 // We're going to leave this in place, in case there are
1604 // any pointers from the heap into it:
1605 // #ifdef mingw32_HOST_OS
1606 // VirtualFree(oc->image);
1608 // stgFree(oc->image);
1610 stgFree(oc->fileName);
1611 stgFree(oc->symbols);
1612 stgFree(oc->sections);
1618 errorBelch("unloadObj: can't find `%s' to unload", path);
1622 /* -----------------------------------------------------------------------------
1623 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1624 * which may be prodded during relocation, and abort if we try and write
1625 * outside any of these.
1627 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1630 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1631 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1635 pb->next = oc->proddables;
1636 oc->proddables = pb;
1639 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1642 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1643 char* s = (char*)(pb->start);
1644 char* e = s + pb->size - 1;
1645 char* a = (char*)addr;
1646 /* Assumes that the biggest fixup involves a 4-byte write. This
1647 probably needs to be changed to 8 (ie, +7) on 64-bit
1649 if (a >= s && (a+3) <= e) return;
1651 barf("checkProddableBlock: invalid fixup in runtime linker");
1654 /* -----------------------------------------------------------------------------
1655 * Section management.
1657 static void addSection ( ObjectCode* oc, SectionKind kind,
1658 void* start, void* end )
1660 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1664 s->next = oc->sections;
1667 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1668 start, ((char*)end)-1, end - start + 1, kind );
1673 /* --------------------------------------------------------------------------
1675 * This is about allocating a small chunk of memory for every symbol in the
1676 * object file. We make sure that the SymboLExtras are always "in range" of
1677 * limited-range PC-relative instructions on various platforms by allocating
1678 * them right next to the object code itself.
1681 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
1684 ocAllocateSymbolExtras
1686 Allocate additional space at the end of the object file image to make room
1687 for jump islands (powerpc, x86_64) and GOT entries (x86_64).
1689 PowerPC relative branch instructions have a 24 bit displacement field.
1690 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1691 If a particular imported symbol is outside this range, we have to redirect
1692 the jump to a short piece of new code that just loads the 32bit absolute
1693 address and jumps there.
1694 On x86_64, PC-relative jumps and PC-relative accesses to the GOT are limited
1697 This function just allocates space for one SymbolExtra for every
1698 undefined symbol in the object file. The code for the jump islands is
1699 filled in by makeSymbolExtra below.
1702 static int ocAllocateSymbolExtras( ObjectCode* oc, int count, int first )
1709 int misalignment = 0;
1710 #ifdef darwin_HOST_OS
1711 misalignment = oc->misalignment;
1717 // round up to the nearest 4
1718 aligned = (oc->fileSize + 3) & ~3;
1721 pagesize = getpagesize();
1722 n = ROUND_UP( oc->fileSize, pagesize );
1723 m = ROUND_UP( aligned + sizeof (SymbolExtra) * count, pagesize );
1725 /* we try to use spare space at the end of the last page of the
1726 * image for the jump islands, but if there isn't enough space
1727 * then we have to map some (anonymously, remembering MAP_32BIT).
1729 if( m > n ) // we need to allocate more pages
1731 oc->symbol_extras = mmapForLinker(sizeof(SymbolExtra) * count,
1736 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1739 oc->image -= misalignment;
1740 oc->image = stgReallocBytes( oc->image,
1742 aligned + sizeof (SymbolExtra) * count,
1743 "ocAllocateSymbolExtras" );
1744 oc->image += misalignment;
1746 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1747 #endif /* USE_MMAP */
1749 memset( oc->symbol_extras, 0, sizeof (SymbolExtra) * count );
1752 oc->symbol_extras = NULL;
1754 oc->first_symbol_extra = first;
1755 oc->n_symbol_extras = count;
1760 static SymbolExtra* makeSymbolExtra( ObjectCode* oc,
1761 unsigned long symbolNumber,
1762 unsigned long target )
1766 ASSERT( symbolNumber >= oc->first_symbol_extra
1767 && symbolNumber - oc->first_symbol_extra < oc->n_symbol_extras);
1769 extra = &oc->symbol_extras[symbolNumber - oc->first_symbol_extra];
1771 #ifdef powerpc_HOST_ARCH
1772 // lis r12, hi16(target)
1773 extra->jumpIsland.lis_r12 = 0x3d80;
1774 extra->jumpIsland.hi_addr = target >> 16;
1776 // ori r12, r12, lo16(target)
1777 extra->jumpIsland.ori_r12_r12 = 0x618c;
1778 extra->jumpIsland.lo_addr = target & 0xffff;
1781 extra->jumpIsland.mtctr_r12 = 0x7d8903a6;
1784 extra->jumpIsland.bctr = 0x4e800420;
1786 #ifdef x86_64_HOST_ARCH
1788 static uint8_t jmp[] = { 0xFF, 0x25, 0xF2, 0xFF, 0xFF, 0xFF };
1789 extra->addr = target;
1790 memcpy(extra->jumpIsland, jmp, 6);
1798 /* --------------------------------------------------------------------------
1799 * PowerPC specifics (instruction cache flushing)
1800 * ------------------------------------------------------------------------*/
1802 #ifdef powerpc_TARGET_ARCH
1804 ocFlushInstructionCache
1806 Flush the data & instruction caches.
1807 Because the PPC has split data/instruction caches, we have to
1808 do that whenever we modify code at runtime.
1811 static void ocFlushInstructionCache( ObjectCode *oc )
1813 int n = (oc->fileSize + sizeof( SymbolExtra ) * oc->n_symbol_extras + 3) / 4;
1814 unsigned long *p = (unsigned long *) oc->image;
1818 __asm__ volatile ( "dcbf 0,%0\n\t"
1826 __asm__ volatile ( "sync\n\t"
1832 /* --------------------------------------------------------------------------
1833 * PEi386 specifics (Win32 targets)
1834 * ------------------------------------------------------------------------*/
1836 /* The information for this linker comes from
1837 Microsoft Portable Executable
1838 and Common Object File Format Specification
1839 revision 5.1 January 1998
1840 which SimonM says comes from the MS Developer Network CDs.
1842 It can be found there (on older CDs), but can also be found
1845 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1847 (this is Rev 6.0 from February 1999).
1849 Things move, so if that fails, try searching for it via
1851 http://www.google.com/search?q=PE+COFF+specification
1853 The ultimate reference for the PE format is the Winnt.h
1854 header file that comes with the Platform SDKs; as always,
1855 implementations will drift wrt their documentation.
1857 A good background article on the PE format is Matt Pietrek's
1858 March 1994 article in Microsoft System Journal (MSJ)
1859 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1860 Win32 Portable Executable File Format." The info in there
1861 has recently been updated in a two part article in
1862 MSDN magazine, issues Feb and March 2002,
1863 "Inside Windows: An In-Depth Look into the Win32 Portable
1864 Executable File Format"
1866 John Levine's book "Linkers and Loaders" contains useful
1871 #if defined(OBJFORMAT_PEi386)
1875 typedef unsigned char UChar;
1876 typedef unsigned short UInt16;
1877 typedef unsigned int UInt32;
1884 UInt16 NumberOfSections;
1885 UInt32 TimeDateStamp;
1886 UInt32 PointerToSymbolTable;
1887 UInt32 NumberOfSymbols;
1888 UInt16 SizeOfOptionalHeader;
1889 UInt16 Characteristics;
1893 #define sizeof_COFF_header 20
1900 UInt32 VirtualAddress;
1901 UInt32 SizeOfRawData;
1902 UInt32 PointerToRawData;
1903 UInt32 PointerToRelocations;
1904 UInt32 PointerToLinenumbers;
1905 UInt16 NumberOfRelocations;
1906 UInt16 NumberOfLineNumbers;
1907 UInt32 Characteristics;
1911 #define sizeof_COFF_section 40
1918 UInt16 SectionNumber;
1921 UChar NumberOfAuxSymbols;
1925 #define sizeof_COFF_symbol 18
1930 UInt32 VirtualAddress;
1931 UInt32 SymbolTableIndex;
1936 #define sizeof_COFF_reloc 10
1939 /* From PE spec doc, section 3.3.2 */
1940 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1941 windows.h -- for the same purpose, but I want to know what I'm
1943 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1944 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1945 #define MYIMAGE_FILE_DLL 0x2000
1946 #define MYIMAGE_FILE_SYSTEM 0x1000
1947 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1948 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1949 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1951 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1952 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1953 #define MYIMAGE_SYM_CLASS_STATIC 3
1954 #define MYIMAGE_SYM_UNDEFINED 0
1956 /* From PE spec doc, section 4.1 */
1957 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1958 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1959 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1961 /* From PE spec doc, section 5.2.1 */
1962 #define MYIMAGE_REL_I386_DIR32 0x0006
1963 #define MYIMAGE_REL_I386_REL32 0x0014
1966 /* We use myindex to calculate array addresses, rather than
1967 simply doing the normal subscript thing. That's because
1968 some of the above structs have sizes which are not
1969 a whole number of words. GCC rounds their sizes up to a
1970 whole number of words, which means that the address calcs
1971 arising from using normal C indexing or pointer arithmetic
1972 are just plain wrong. Sigh.
1975 myindex ( int scale, void* base, int index )
1978 ((UChar*)base) + scale * index;
1983 printName ( UChar* name, UChar* strtab )
1985 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1986 UInt32 strtab_offset = * (UInt32*)(name+4);
1987 debugBelch("%s", strtab + strtab_offset );
1990 for (i = 0; i < 8; i++) {
1991 if (name[i] == 0) break;
1992 debugBelch("%c", name[i] );
1999 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
2001 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2002 UInt32 strtab_offset = * (UInt32*)(name+4);
2003 strncpy ( dst, strtab+strtab_offset, dstSize );
2009 if (name[i] == 0) break;
2019 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
2022 /* If the string is longer than 8 bytes, look in the
2023 string table for it -- this will be correctly zero terminated.
2025 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2026 UInt32 strtab_offset = * (UInt32*)(name+4);
2027 return ((UChar*)strtab) + strtab_offset;
2029 /* Otherwise, if shorter than 8 bytes, return the original,
2030 which by defn is correctly terminated.
2032 if (name[7]==0) return name;
2033 /* The annoying case: 8 bytes. Copy into a temporary
2034 (which is never freed ...)
2036 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
2038 strncpy(newstr,name,8);
2044 /* Just compares the short names (first 8 chars) */
2045 static COFF_section *
2046 findPEi386SectionCalled ( ObjectCode* oc, char* name )
2050 = (COFF_header*)(oc->image);
2051 COFF_section* sectab
2053 ((UChar*)(oc->image))
2054 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2056 for (i = 0; i < hdr->NumberOfSections; i++) {
2059 COFF_section* section_i
2061 myindex ( sizeof_COFF_section, sectab, i );
2062 n1 = (UChar*) &(section_i->Name);
2064 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
2065 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
2066 n1[6]==n2[6] && n1[7]==n2[7])
2075 zapTrailingAtSign ( UChar* sym )
2077 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
2079 if (sym[0] == 0) return;
2081 while (sym[i] != 0) i++;
2084 while (j > 0 && my_isdigit(sym[j])) j--;
2085 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
2090 lookupSymbolInDLLs ( UChar *lbl )
2095 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
2096 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
2098 if (lbl[0] == '_') {
2099 /* HACK: if the name has an initial underscore, try stripping
2100 it off & look that up first. I've yet to verify whether there's
2101 a Rule that governs whether an initial '_' *should always* be
2102 stripped off when mapping from import lib name to the DLL name.
2104 sym = GetProcAddress(o_dll->instance, (lbl+1));
2106 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
2110 sym = GetProcAddress(o_dll->instance, lbl);
2112 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
2121 ocVerifyImage_PEi386 ( ObjectCode* oc )
2126 COFF_section* sectab;
2127 COFF_symbol* symtab;
2129 /* debugBelch("\nLOADING %s\n", oc->fileName); */
2130 hdr = (COFF_header*)(oc->image);
2131 sectab = (COFF_section*) (
2132 ((UChar*)(oc->image))
2133 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2135 symtab = (COFF_symbol*) (
2136 ((UChar*)(oc->image))
2137 + hdr->PointerToSymbolTable
2139 strtab = ((UChar*)symtab)
2140 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2142 if (hdr->Machine != 0x14c) {
2143 errorBelch("%s: Not x86 PEi386", oc->fileName);
2146 if (hdr->SizeOfOptionalHeader != 0) {
2147 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2150 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2151 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2152 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2153 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2154 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2157 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2158 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2159 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2161 (int)(hdr->Characteristics));
2164 /* If the string table size is way crazy, this might indicate that
2165 there are more than 64k relocations, despite claims to the
2166 contrary. Hence this test. */
2167 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2169 if ( (*(UInt32*)strtab) > 600000 ) {
2170 /* Note that 600k has no special significance other than being
2171 big enough to handle the almost-2MB-sized lumps that
2172 constitute HSwin32*.o. */
2173 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2178 /* No further verification after this point; only debug printing. */
2180 IF_DEBUG(linker, i=1);
2181 if (i == 0) return 1;
2183 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2184 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2185 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2188 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2189 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2190 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2191 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2192 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2193 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2194 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2196 /* Print the section table. */
2198 for (i = 0; i < hdr->NumberOfSections; i++) {
2200 COFF_section* sectab_i
2202 myindex ( sizeof_COFF_section, sectab, i );
2209 printName ( sectab_i->Name, strtab );
2219 sectab_i->VirtualSize,
2220 sectab_i->VirtualAddress,
2221 sectab_i->SizeOfRawData,
2222 sectab_i->PointerToRawData,
2223 sectab_i->NumberOfRelocations,
2224 sectab_i->PointerToRelocations,
2225 sectab_i->PointerToRawData
2227 reltab = (COFF_reloc*) (
2228 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2231 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2232 /* If the relocation field (a short) has overflowed, the
2233 * real count can be found in the first reloc entry.
2235 * See Section 4.1 (last para) of the PE spec (rev6.0).
2237 COFF_reloc* rel = (COFF_reloc*)
2238 myindex ( sizeof_COFF_reloc, reltab, 0 );
2239 noRelocs = rel->VirtualAddress;
2242 noRelocs = sectab_i->NumberOfRelocations;
2246 for (; j < noRelocs; j++) {
2248 COFF_reloc* rel = (COFF_reloc*)
2249 myindex ( sizeof_COFF_reloc, reltab, j );
2251 " type 0x%-4x vaddr 0x%-8x name `",
2253 rel->VirtualAddress );
2254 sym = (COFF_symbol*)
2255 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2256 /* Hmm..mysterious looking offset - what's it for? SOF */
2257 printName ( sym->Name, strtab -10 );
2264 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2265 debugBelch("---START of string table---\n");
2266 for (i = 4; i < *(Int32*)strtab; i++) {
2268 debugBelch("\n"); else
2269 debugBelch("%c", strtab[i] );
2271 debugBelch("--- END of string table---\n");
2276 COFF_symbol* symtab_i;
2277 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2278 symtab_i = (COFF_symbol*)
2279 myindex ( sizeof_COFF_symbol, symtab, i );
2285 printName ( symtab_i->Name, strtab );
2294 (Int32)(symtab_i->SectionNumber),
2295 (UInt32)symtab_i->Type,
2296 (UInt32)symtab_i->StorageClass,
2297 (UInt32)symtab_i->NumberOfAuxSymbols
2299 i += symtab_i->NumberOfAuxSymbols;
2309 ocGetNames_PEi386 ( ObjectCode* oc )
2312 COFF_section* sectab;
2313 COFF_symbol* symtab;
2320 hdr = (COFF_header*)(oc->image);
2321 sectab = (COFF_section*) (
2322 ((UChar*)(oc->image))
2323 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2325 symtab = (COFF_symbol*) (
2326 ((UChar*)(oc->image))
2327 + hdr->PointerToSymbolTable
2329 strtab = ((UChar*)(oc->image))
2330 + hdr->PointerToSymbolTable
2331 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2333 /* Allocate space for any (local, anonymous) .bss sections. */
2335 for (i = 0; i < hdr->NumberOfSections; i++) {
2338 COFF_section* sectab_i
2340 myindex ( sizeof_COFF_section, sectab, i );
2341 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2342 /* sof 10/05: the PE spec text isn't too clear regarding what
2343 * the SizeOfRawData field is supposed to hold for object
2344 * file sections containing just uninitialized data -- for executables,
2345 * it is supposed to be zero; unclear what it's supposed to be
2346 * for object files. However, VirtualSize is guaranteed to be
2347 * zero for object files, which definitely suggests that SizeOfRawData
2348 * will be non-zero (where else would the size of this .bss section be
2349 * stored?) Looking at the COFF_section info for incoming object files,
2350 * this certainly appears to be the case.
2352 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2353 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2354 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2355 * variable decls into to the .bss section. (The specific function in Q which
2356 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2358 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2359 /* This is a non-empty .bss section. Allocate zeroed space for
2360 it, and set its PointerToRawData field such that oc->image +
2361 PointerToRawData == addr_of_zeroed_space. */
2362 bss_sz = sectab_i->VirtualSize;
2363 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2364 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2365 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2366 addProddableBlock(oc, zspace, bss_sz);
2367 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2370 /* Copy section information into the ObjectCode. */
2372 for (i = 0; i < hdr->NumberOfSections; i++) {
2378 = SECTIONKIND_OTHER;
2379 COFF_section* sectab_i
2381 myindex ( sizeof_COFF_section, sectab, i );
2382 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2385 /* I'm sure this is the Right Way to do it. However, the
2386 alternative of testing the sectab_i->Name field seems to
2387 work ok with Cygwin.
2389 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2390 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2391 kind = SECTIONKIND_CODE_OR_RODATA;
2394 if (0==strcmp(".text",sectab_i->Name) ||
2395 0==strcmp(".rdata",sectab_i->Name)||
2396 0==strcmp(".rodata",sectab_i->Name))
2397 kind = SECTIONKIND_CODE_OR_RODATA;
2398 if (0==strcmp(".data",sectab_i->Name) ||
2399 0==strcmp(".bss",sectab_i->Name))
2400 kind = SECTIONKIND_RWDATA;
2402 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2403 sz = sectab_i->SizeOfRawData;
2404 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2406 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2407 end = start + sz - 1;
2409 if (kind == SECTIONKIND_OTHER
2410 /* Ignore sections called which contain stabs debugging
2412 && 0 != strcmp(".stab", sectab_i->Name)
2413 && 0 != strcmp(".stabstr", sectab_i->Name)
2414 /* ignore constructor section for now */
2415 && 0 != strcmp(".ctors", sectab_i->Name)
2416 /* ignore section generated from .ident */
2417 && 0!= strcmp("/4", sectab_i->Name)
2418 /* ignore unknown section that appeared in gcc 3.4.5(?) */
2419 && 0!= strcmp(".reloc", sectab_i->Name)
2421 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2425 if (kind != SECTIONKIND_OTHER && end >= start) {
2426 addSection(oc, kind, start, end);
2427 addProddableBlock(oc, start, end - start + 1);
2431 /* Copy exported symbols into the ObjectCode. */
2433 oc->n_symbols = hdr->NumberOfSymbols;
2434 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2435 "ocGetNames_PEi386(oc->symbols)");
2436 /* Call me paranoid; I don't care. */
2437 for (i = 0; i < oc->n_symbols; i++)
2438 oc->symbols[i] = NULL;
2442 COFF_symbol* symtab_i;
2443 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2444 symtab_i = (COFF_symbol*)
2445 myindex ( sizeof_COFF_symbol, symtab, i );
2449 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2450 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2451 /* This symbol is global and defined, viz, exported */
2452 /* for MYIMAGE_SYMCLASS_EXTERNAL
2453 && !MYIMAGE_SYM_UNDEFINED,
2454 the address of the symbol is:
2455 address of relevant section + offset in section
2457 COFF_section* sectabent
2458 = (COFF_section*) myindex ( sizeof_COFF_section,
2460 symtab_i->SectionNumber-1 );
2461 addr = ((UChar*)(oc->image))
2462 + (sectabent->PointerToRawData
2466 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2467 && symtab_i->Value > 0) {
2468 /* This symbol isn't in any section at all, ie, global bss.
2469 Allocate zeroed space for it. */
2470 addr = stgCallocBytes(1, symtab_i->Value,
2471 "ocGetNames_PEi386(non-anonymous bss)");
2472 addSection(oc, SECTIONKIND_RWDATA, addr,
2473 ((UChar*)addr) + symtab_i->Value - 1);
2474 addProddableBlock(oc, addr, symtab_i->Value);
2475 /* debugBelch("BSS section at 0x%x\n", addr); */
2478 if (addr != NULL ) {
2479 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2480 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2481 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2482 ASSERT(i >= 0 && i < oc->n_symbols);
2483 /* cstring_from_COFF_symbol_name always succeeds. */
2484 oc->symbols[i] = sname;
2485 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2489 "IGNORING symbol %d\n"
2493 printName ( symtab_i->Name, strtab );
2502 (Int32)(symtab_i->SectionNumber),
2503 (UInt32)symtab_i->Type,
2504 (UInt32)symtab_i->StorageClass,
2505 (UInt32)symtab_i->NumberOfAuxSymbols
2510 i += symtab_i->NumberOfAuxSymbols;
2519 ocResolve_PEi386 ( ObjectCode* oc )
2522 COFF_section* sectab;
2523 COFF_symbol* symtab;
2533 /* ToDo: should be variable-sized? But is at least safe in the
2534 sense of buffer-overrun-proof. */
2536 /* debugBelch("resolving for %s\n", oc->fileName); */
2538 hdr = (COFF_header*)(oc->image);
2539 sectab = (COFF_section*) (
2540 ((UChar*)(oc->image))
2541 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2543 symtab = (COFF_symbol*) (
2544 ((UChar*)(oc->image))
2545 + hdr->PointerToSymbolTable
2547 strtab = ((UChar*)(oc->image))
2548 + hdr->PointerToSymbolTable
2549 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2551 for (i = 0; i < hdr->NumberOfSections; i++) {
2552 COFF_section* sectab_i
2554 myindex ( sizeof_COFF_section, sectab, i );
2557 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2560 /* Ignore sections called which contain stabs debugging
2562 if (0 == strcmp(".stab", sectab_i->Name)
2563 || 0 == strcmp(".stabstr", sectab_i->Name)
2564 || 0 == strcmp(".ctors", sectab_i->Name))
2567 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2568 /* If the relocation field (a short) has overflowed, the
2569 * real count can be found in the first reloc entry.
2571 * See Section 4.1 (last para) of the PE spec (rev6.0).
2573 * Nov2003 update: the GNU linker still doesn't correctly
2574 * handle the generation of relocatable object files with
2575 * overflown relocations. Hence the output to warn of potential
2578 COFF_reloc* rel = (COFF_reloc*)
2579 myindex ( sizeof_COFF_reloc, reltab, 0 );
2580 noRelocs = rel->VirtualAddress;
2582 /* 10/05: we now assume (and check for) a GNU ld that is capable
2583 * of handling object files with (>2^16) of relocs.
2586 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2591 noRelocs = sectab_i->NumberOfRelocations;
2596 for (; j < noRelocs; j++) {
2598 COFF_reloc* reltab_j
2600 myindex ( sizeof_COFF_reloc, reltab, j );
2602 /* the location to patch */
2604 ((UChar*)(oc->image))
2605 + (sectab_i->PointerToRawData
2606 + reltab_j->VirtualAddress
2607 - sectab_i->VirtualAddress )
2609 /* the existing contents of pP */
2611 /* the symbol to connect to */
2612 sym = (COFF_symbol*)
2613 myindex ( sizeof_COFF_symbol,
2614 symtab, reltab_j->SymbolTableIndex );
2617 "reloc sec %2d num %3d: type 0x%-4x "
2618 "vaddr 0x%-8x name `",
2620 (UInt32)reltab_j->Type,
2621 reltab_j->VirtualAddress );
2622 printName ( sym->Name, strtab );
2623 debugBelch("'\n" ));
2625 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2626 COFF_section* section_sym
2627 = findPEi386SectionCalled ( oc, sym->Name );
2629 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2632 S = ((UInt32)(oc->image))
2633 + (section_sym->PointerToRawData
2636 copyName ( sym->Name, strtab, symbol, 1000-1 );
2637 S = (UInt32) lookupSymbol( symbol );
2638 if ((void*)S != NULL) goto foundit;
2639 /* Newline first because the interactive linker has printed "linking..." */
2640 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2644 checkProddableBlock(oc, pP);
2645 switch (reltab_j->Type) {
2646 case MYIMAGE_REL_I386_DIR32:
2649 case MYIMAGE_REL_I386_REL32:
2650 /* Tricky. We have to insert a displacement at
2651 pP which, when added to the PC for the _next_
2652 insn, gives the address of the target (S).
2653 Problem is to know the address of the next insn
2654 when we only know pP. We assume that this
2655 literal field is always the last in the insn,
2656 so that the address of the next insn is pP+4
2657 -- hence the constant 4.
2658 Also I don't know if A should be added, but so
2659 far it has always been zero.
2661 SOF 05/2005: 'A' (old contents of *pP) have been observed
2662 to contain values other than zero (the 'wx' object file
2663 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2664 So, add displacement to old value instead of asserting
2665 A to be zero. Fixes wxhaskell-related crashes, and no other
2666 ill effects have been observed.
2668 Update: the reason why we're seeing these more elaborate
2669 relocations is due to a switch in how the NCG compiles SRTs
2670 and offsets to them from info tables. SRTs live in .(ro)data,
2671 while info tables live in .text, causing GAS to emit REL32/DISP32
2672 relocations with non-zero values. Adding the displacement is
2673 the right thing to do.
2675 *pP = S - ((UInt32)pP) - 4 + A;
2678 debugBelch("%s: unhandled PEi386 relocation type %d",
2679 oc->fileName, reltab_j->Type);
2686 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2690 #endif /* defined(OBJFORMAT_PEi386) */
2693 /* --------------------------------------------------------------------------
2695 * ------------------------------------------------------------------------*/
2697 #if defined(OBJFORMAT_ELF)
2702 #if defined(sparc_HOST_ARCH)
2703 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2704 #elif defined(i386_HOST_ARCH)
2705 # define ELF_TARGET_386 /* Used inside <elf.h> */
2706 #elif defined(x86_64_HOST_ARCH)
2707 # define ELF_TARGET_X64_64
2709 #elif defined (ia64_HOST_ARCH)
2710 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2712 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2713 # define ELF_NEED_GOT /* needs Global Offset Table */
2714 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2717 #if !defined(openbsd_HOST_OS)
2720 /* openbsd elf has things in different places, with diff names */
2721 # include <elf_abi.h>
2722 # include <machine/reloc.h>
2723 # define R_386_32 RELOC_32
2724 # define R_386_PC32 RELOC_PC32
2727 /* If elf.h doesn't define it */
2728 # ifndef R_X86_64_PC64
2729 # define R_X86_64_PC64 24
2733 * Define a set of types which can be used for both ELF32 and ELF64
2737 #define ELFCLASS ELFCLASS64
2738 #define Elf_Addr Elf64_Addr
2739 #define Elf_Word Elf64_Word
2740 #define Elf_Sword Elf64_Sword
2741 #define Elf_Ehdr Elf64_Ehdr
2742 #define Elf_Phdr Elf64_Phdr
2743 #define Elf_Shdr Elf64_Shdr
2744 #define Elf_Sym Elf64_Sym
2745 #define Elf_Rel Elf64_Rel
2746 #define Elf_Rela Elf64_Rela
2747 #define ELF_ST_TYPE ELF64_ST_TYPE
2748 #define ELF_ST_BIND ELF64_ST_BIND
2749 #define ELF_R_TYPE ELF64_R_TYPE
2750 #define ELF_R_SYM ELF64_R_SYM
2752 #define ELFCLASS ELFCLASS32
2753 #define Elf_Addr Elf32_Addr
2754 #define Elf_Word Elf32_Word
2755 #define Elf_Sword Elf32_Sword
2756 #define Elf_Ehdr Elf32_Ehdr
2757 #define Elf_Phdr Elf32_Phdr
2758 #define Elf_Shdr Elf32_Shdr
2759 #define Elf_Sym Elf32_Sym
2760 #define Elf_Rel Elf32_Rel
2761 #define Elf_Rela Elf32_Rela
2763 #define ELF_ST_TYPE ELF32_ST_TYPE
2766 #define ELF_ST_BIND ELF32_ST_BIND
2769 #define ELF_R_TYPE ELF32_R_TYPE
2772 #define ELF_R_SYM ELF32_R_SYM
2778 * Functions to allocate entries in dynamic sections. Currently we simply
2779 * preallocate a large number, and we don't check if a entry for the given
2780 * target already exists (a linear search is too slow). Ideally these
2781 * entries would be associated with symbols.
2784 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2785 #define GOT_SIZE 0x20000
2786 #define FUNCTION_TABLE_SIZE 0x10000
2787 #define PLT_SIZE 0x08000
2790 static Elf_Addr got[GOT_SIZE];
2791 static unsigned int gotIndex;
2792 static Elf_Addr gp_val = (Elf_Addr)got;
2795 allocateGOTEntry(Elf_Addr target)
2799 if (gotIndex >= GOT_SIZE)
2800 barf("Global offset table overflow");
2802 entry = &got[gotIndex++];
2804 return (Elf_Addr)entry;
2808 #ifdef ELF_FUNCTION_DESC
2814 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2815 static unsigned int functionTableIndex;
2818 allocateFunctionDesc(Elf_Addr target)
2820 FunctionDesc *entry;
2822 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2823 barf("Function table overflow");
2825 entry = &functionTable[functionTableIndex++];
2827 entry->gp = (Elf_Addr)gp_val;
2828 return (Elf_Addr)entry;
2832 copyFunctionDesc(Elf_Addr target)
2834 FunctionDesc *olddesc = (FunctionDesc *)target;
2835 FunctionDesc *newdesc;
2837 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2838 newdesc->gp = olddesc->gp;
2839 return (Elf_Addr)newdesc;
2844 #ifdef ia64_HOST_ARCH
2845 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2846 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2848 static unsigned char plt_code[] =
2850 /* taken from binutils bfd/elfxx-ia64.c */
2851 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2852 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2853 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2854 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2855 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2856 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2859 /* If we can't get to the function descriptor via gp, take a local copy of it */
2860 #define PLT_RELOC(code, target) { \
2861 Elf64_Sxword rel_value = target - gp_val; \
2862 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2863 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2865 ia64_reloc_gprel22((Elf_Addr)code, target); \
2870 unsigned char code[sizeof(plt_code)];
2874 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2876 PLTEntry *plt = (PLTEntry *)oc->plt;
2879 if (oc->pltIndex >= PLT_SIZE)
2880 barf("Procedure table overflow");
2882 entry = &plt[oc->pltIndex++];
2883 memcpy(entry->code, plt_code, sizeof(entry->code));
2884 PLT_RELOC(entry->code, target);
2885 return (Elf_Addr)entry;
2891 return (PLT_SIZE * sizeof(PLTEntry));
2897 * Generic ELF functions
2901 findElfSection ( void* objImage, Elf_Word sh_type )
2903 char* ehdrC = (char*)objImage;
2904 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2905 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2906 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2910 for (i = 0; i < ehdr->e_shnum; i++) {
2911 if (shdr[i].sh_type == sh_type
2912 /* Ignore the section header's string table. */
2913 && i != ehdr->e_shstrndx
2914 /* Ignore string tables named .stabstr, as they contain
2916 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2918 ptr = ehdrC + shdr[i].sh_offset;
2925 #if defined(ia64_HOST_ARCH)
2927 findElfSegment ( void* objImage, Elf_Addr vaddr )
2929 char* ehdrC = (char*)objImage;
2930 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2931 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2932 Elf_Addr segaddr = 0;
2935 for (i = 0; i < ehdr->e_phnum; i++) {
2936 segaddr = phdr[i].p_vaddr;
2937 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2945 ocVerifyImage_ELF ( ObjectCode* oc )
2949 int i, j, nent, nstrtab, nsymtabs;
2953 char* ehdrC = (char*)(oc->image);
2954 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2956 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2957 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2958 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2959 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2960 errorBelch("%s: not an ELF object", oc->fileName);
2964 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2965 errorBelch("%s: unsupported ELF format", oc->fileName);
2969 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2970 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2972 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2973 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2975 errorBelch("%s: unknown endiannness", oc->fileName);
2979 if (ehdr->e_type != ET_REL) {
2980 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2983 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2985 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2986 switch (ehdr->e_machine) {
2987 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2988 #ifdef EM_SPARC32PLUS
2989 case EM_SPARC32PLUS:
2991 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2993 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2995 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2997 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2998 #elif defined(EM_AMD64)
2999 case EM_AMD64: IF_DEBUG(linker,debugBelch( "amd64" )); break;
3001 default: IF_DEBUG(linker,debugBelch( "unknown" ));
3002 errorBelch("%s: unknown architecture (e_machine == %d)"
3003 , oc->fileName, ehdr->e_machine);
3007 IF_DEBUG(linker,debugBelch(
3008 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
3009 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
3011 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
3013 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3015 if (ehdr->e_shstrndx == SHN_UNDEF) {
3016 errorBelch("%s: no section header string table", oc->fileName);
3019 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
3021 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
3024 for (i = 0; i < ehdr->e_shnum; i++) {
3025 IF_DEBUG(linker,debugBelch("%2d: ", i ));
3026 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
3027 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
3028 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
3029 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
3030 ehdrC + shdr[i].sh_offset,
3031 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
3033 if (shdr[i].sh_type == SHT_REL) {
3034 IF_DEBUG(linker,debugBelch("Rel " ));
3035 } else if (shdr[i].sh_type == SHT_RELA) {
3036 IF_DEBUG(linker,debugBelch("RelA " ));
3038 IF_DEBUG(linker,debugBelch(" "));
3041 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
3045 IF_DEBUG(linker,debugBelch( "\nString tables" ));
3048 for (i = 0; i < ehdr->e_shnum; i++) {
3049 if (shdr[i].sh_type == SHT_STRTAB
3050 /* Ignore the section header's string table. */
3051 && i != ehdr->e_shstrndx
3052 /* Ignore string tables named .stabstr, as they contain
3054 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
3056 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
3057 strtab = ehdrC + shdr[i].sh_offset;
3062 errorBelch("%s: no string tables, or too many", oc->fileName);
3067 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
3068 for (i = 0; i < ehdr->e_shnum; i++) {
3069 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3070 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
3072 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3073 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3074 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
3076 (long)shdr[i].sh_size % sizeof(Elf_Sym)
3078 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
3079 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
3082 for (j = 0; j < nent; j++) {
3083 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3084 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3085 (int)stab[j].st_shndx,
3086 (int)stab[j].st_size,
3087 (char*)stab[j].st_value ));
3089 IF_DEBUG(linker,debugBelch("type=" ));
3090 switch (ELF_ST_TYPE(stab[j].st_info)) {
3091 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3092 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3093 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3094 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3095 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3096 default: IF_DEBUG(linker,debugBelch("? " )); break;
3098 IF_DEBUG(linker,debugBelch(" " ));
3100 IF_DEBUG(linker,debugBelch("bind=" ));
3101 switch (ELF_ST_BIND(stab[j].st_info)) {
3102 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3103 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3104 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3105 default: IF_DEBUG(linker,debugBelch("? " )); break;
3107 IF_DEBUG(linker,debugBelch(" " ));
3109 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3113 if (nsymtabs == 0) {
3114 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3121 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3125 if (hdr->sh_type == SHT_PROGBITS
3126 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3127 /* .text-style section */
3128 return SECTIONKIND_CODE_OR_RODATA;
3131 if (hdr->sh_type == SHT_PROGBITS
3132 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3133 /* .data-style section */
3134 return SECTIONKIND_RWDATA;
3137 if (hdr->sh_type == SHT_PROGBITS
3138 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3139 /* .rodata-style section */
3140 return SECTIONKIND_CODE_OR_RODATA;
3143 if (hdr->sh_type == SHT_NOBITS
3144 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3145 /* .bss-style section */
3147 return SECTIONKIND_RWDATA;
3150 return SECTIONKIND_OTHER;
3155 ocGetNames_ELF ( ObjectCode* oc )
3160 char* ehdrC = (char*)(oc->image);
3161 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3162 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3163 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3165 ASSERT(symhash != NULL);
3168 errorBelch("%s: no strtab", oc->fileName);
3173 for (i = 0; i < ehdr->e_shnum; i++) {
3174 /* Figure out what kind of section it is. Logic derived from
3175 Figure 1.14 ("Special Sections") of the ELF document
3176 ("Portable Formats Specification, Version 1.1"). */
3178 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3180 if (is_bss && shdr[i].sh_size > 0) {
3181 /* This is a non-empty .bss section. Allocate zeroed space for
3182 it, and set its .sh_offset field such that
3183 ehdrC + .sh_offset == addr_of_zeroed_space. */
3184 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3185 "ocGetNames_ELF(BSS)");
3186 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3188 debugBelch("BSS section at 0x%x, size %d\n",
3189 zspace, shdr[i].sh_size);
3193 /* fill in the section info */
3194 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3195 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3196 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3197 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3200 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3202 /* copy stuff into this module's object symbol table */
3203 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3204 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3206 oc->n_symbols = nent;
3207 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3208 "ocGetNames_ELF(oc->symbols)");
3210 for (j = 0; j < nent; j++) {
3212 char isLocal = FALSE; /* avoids uninit-var warning */
3214 char* nm = strtab + stab[j].st_name;
3215 int secno = stab[j].st_shndx;
3217 /* Figure out if we want to add it; if so, set ad to its
3218 address. Otherwise leave ad == NULL. */
3220 if (secno == SHN_COMMON) {
3222 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3224 debugBelch("COMMON symbol, size %d name %s\n",
3225 stab[j].st_size, nm);
3227 /* Pointless to do addProddableBlock() for this area,
3228 since the linker should never poke around in it. */
3231 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3232 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3234 /* and not an undefined symbol */
3235 && stab[j].st_shndx != SHN_UNDEF
3236 /* and not in a "special section" */
3237 && stab[j].st_shndx < SHN_LORESERVE
3239 /* and it's a not a section or string table or anything silly */
3240 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3241 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3242 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3245 /* Section 0 is the undefined section, hence > and not >=. */
3246 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3248 if (shdr[secno].sh_type == SHT_NOBITS) {
3249 debugBelch(" BSS symbol, size %d off %d name %s\n",
3250 stab[j].st_size, stab[j].st_value, nm);
3253 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3254 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3257 #ifdef ELF_FUNCTION_DESC
3258 /* dlsym() and the initialisation table both give us function
3259 * descriptors, so to be consistent we store function descriptors
3260 * in the symbol table */
3261 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3262 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3264 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s\n",
3265 ad, oc->fileName, nm ));
3270 /* And the decision is ... */
3274 oc->symbols[j] = nm;
3277 /* Ignore entirely. */
3279 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3283 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3284 strtab + stab[j].st_name ));
3287 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3288 (int)ELF_ST_BIND(stab[j].st_info),
3289 (int)ELF_ST_TYPE(stab[j].st_info),
3290 (int)stab[j].st_shndx,
3291 strtab + stab[j].st_name
3294 oc->symbols[j] = NULL;
3303 /* Do ELF relocations which lack an explicit addend. All x86-linux
3304 relocations appear to be of this form. */
3306 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3307 Elf_Shdr* shdr, int shnum,
3308 Elf_Sym* stab, char* strtab )
3313 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3314 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3315 int target_shndx = shdr[shnum].sh_info;
3316 int symtab_shndx = shdr[shnum].sh_link;
3318 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3319 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3320 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3321 target_shndx, symtab_shndx ));
3323 /* Skip sections that we're not interested in. */
3326 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3327 if (kind == SECTIONKIND_OTHER) {
3328 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3333 for (j = 0; j < nent; j++) {
3334 Elf_Addr offset = rtab[j].r_offset;
3335 Elf_Addr info = rtab[j].r_info;
3337 Elf_Addr P = ((Elf_Addr)targ) + offset;
3338 Elf_Word* pP = (Elf_Word*)P;
3343 StgStablePtr stablePtr;
3346 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3347 j, (void*)offset, (void*)info ));
3349 IF_DEBUG(linker,debugBelch( " ZERO" ));
3352 Elf_Sym sym = stab[ELF_R_SYM(info)];
3353 /* First see if it is a local symbol. */
3354 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3355 /* Yes, so we can get the address directly from the ELF symbol
3357 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3359 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3360 + stab[ELF_R_SYM(info)].st_value);
3363 symbol = strtab + sym.st_name;
3364 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3365 if (NULL == stablePtr) {
3366 /* No, so look up the name in our global table. */
3367 S_tmp = lookupSymbol( symbol );
3368 S = (Elf_Addr)S_tmp;
3370 stableVal = deRefStablePtr( stablePtr );
3372 S = (Elf_Addr)S_tmp;
3376 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3379 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3382 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3383 (void*)P, (void*)S, (void*)A ));
3384 checkProddableBlock ( oc, pP );
3388 switch (ELF_R_TYPE(info)) {
3389 # ifdef i386_HOST_ARCH
3390 case R_386_32: *pP = value; break;
3391 case R_386_PC32: *pP = value - P; break;
3394 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3395 oc->fileName, (lnat)ELF_R_TYPE(info));
3403 /* Do ELF relocations for which explicit addends are supplied.
3404 sparc-solaris relocations appear to be of this form. */
3406 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3407 Elf_Shdr* shdr, int shnum,
3408 Elf_Sym* stab, char* strtab )
3411 char *symbol = NULL;
3413 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3414 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3415 int target_shndx = shdr[shnum].sh_info;
3416 int symtab_shndx = shdr[shnum].sh_link;
3418 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3419 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3420 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3421 target_shndx, symtab_shndx ));
3423 for (j = 0; j < nent; j++) {
3424 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3425 /* This #ifdef only serves to avoid unused-var warnings. */
3426 Elf_Addr offset = rtab[j].r_offset;
3427 Elf_Addr P = targ + offset;
3429 Elf_Addr info = rtab[j].r_info;
3430 Elf_Addr A = rtab[j].r_addend;
3434 # if defined(sparc_HOST_ARCH)
3435 Elf_Word* pP = (Elf_Word*)P;
3437 # elif defined(ia64_HOST_ARCH)
3438 Elf64_Xword *pP = (Elf64_Xword *)P;
3440 # elif defined(powerpc_HOST_ARCH)
3444 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3445 j, (void*)offset, (void*)info,
3448 IF_DEBUG(linker,debugBelch( " ZERO" ));
3451 Elf_Sym sym = stab[ELF_R_SYM(info)];
3452 /* First see if it is a local symbol. */
3453 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3454 /* Yes, so we can get the address directly from the ELF symbol
3456 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3458 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3459 + stab[ELF_R_SYM(info)].st_value);
3460 #ifdef ELF_FUNCTION_DESC
3461 /* Make a function descriptor for this function */
3462 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3463 S = allocateFunctionDesc(S + A);
3468 /* No, so look up the name in our global table. */
3469 symbol = strtab + sym.st_name;
3470 S_tmp = lookupSymbol( symbol );
3471 S = (Elf_Addr)S_tmp;
3473 #ifdef ELF_FUNCTION_DESC
3474 /* If a function, already a function descriptor - we would
3475 have to copy it to add an offset. */
3476 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3477 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3481 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3484 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3487 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3488 (void*)P, (void*)S, (void*)A ));
3489 /* checkProddableBlock ( oc, (void*)P ); */
3493 switch (ELF_R_TYPE(info)) {
3494 # if defined(sparc_HOST_ARCH)
3495 case R_SPARC_WDISP30:
3496 w1 = *pP & 0xC0000000;
3497 w2 = (Elf_Word)((value - P) >> 2);
3498 ASSERT((w2 & 0xC0000000) == 0);
3503 w1 = *pP & 0xFFC00000;
3504 w2 = (Elf_Word)(value >> 10);
3505 ASSERT((w2 & 0xFFC00000) == 0);
3511 w2 = (Elf_Word)(value & 0x3FF);
3512 ASSERT((w2 & ~0x3FF) == 0);
3516 /* According to the Sun documentation:
3518 This relocation type resembles R_SPARC_32, except it refers to an
3519 unaligned word. That is, the word to be relocated must be treated
3520 as four separate bytes with arbitrary alignment, not as a word
3521 aligned according to the architecture requirements.
3523 (JRS: which means that freeloading on the R_SPARC_32 case
3524 is probably wrong, but hey ...)
3528 w2 = (Elf_Word)value;
3531 # elif defined(ia64_HOST_ARCH)
3532 case R_IA64_DIR64LSB:
3533 case R_IA64_FPTR64LSB:
3536 case R_IA64_PCREL64LSB:
3539 case R_IA64_SEGREL64LSB:
3540 addr = findElfSegment(ehdrC, value);
3543 case R_IA64_GPREL22:
3544 ia64_reloc_gprel22(P, value);
3546 case R_IA64_LTOFF22:
3547 case R_IA64_LTOFF22X:
3548 case R_IA64_LTOFF_FPTR22:
3549 addr = allocateGOTEntry(value);
3550 ia64_reloc_gprel22(P, addr);
3552 case R_IA64_PCREL21B:
3553 ia64_reloc_pcrel21(P, S, oc);
3556 /* This goes with R_IA64_LTOFF22X and points to the load to
3557 * convert into a move. We don't implement relaxation. */
3559 # elif defined(powerpc_HOST_ARCH)
3560 case R_PPC_ADDR16_LO:
3561 *(Elf32_Half*) P = value;
3564 case R_PPC_ADDR16_HI:
3565 *(Elf32_Half*) P = value >> 16;
3568 case R_PPC_ADDR16_HA:
3569 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3573 *(Elf32_Word *) P = value;
3577 *(Elf32_Word *) P = value - P;
3583 if( delta << 6 >> 6 != delta )
3585 value = (Elf_Addr) (&makeSymbolExtra( oc, ELF_R_SYM(info), value )
3589 if( value == 0 || delta << 6 >> 6 != delta )
3591 barf( "Unable to make SymbolExtra for #%d",
3597 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3598 | (delta & 0x3fffffc);
3602 #if x86_64_HOST_ARCH
3604 *(Elf64_Xword *)P = value;
3609 StgInt64 off = value - P;
3610 if (off >= 0x7fffffffL || off < -0x80000000L) {
3611 #if X86_64_ELF_NONPIC_HACK
3612 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3614 off = pltAddress + A - P;
3616 barf("R_X86_64_PC32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3617 symbol, off, oc->fileName );
3620 *(Elf64_Word *)P = (Elf64_Word)off;
3626 StgInt64 off = value - P;
3627 *(Elf64_Word *)P = (Elf64_Word)off;
3632 if (value >= 0x7fffffffL) {
3633 #if X86_64_ELF_NONPIC_HACK
3634 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3636 value = pltAddress + A;
3638 barf("R_X86_64_32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3639 symbol, value, oc->fileName );
3642 *(Elf64_Word *)P = (Elf64_Word)value;
3646 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3647 #if X86_64_ELF_NONPIC_HACK
3648 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3650 value = pltAddress + A;
3652 barf("R_X86_64_32S relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3653 symbol, value, oc->fileName );
3656 *(Elf64_Sword *)P = (Elf64_Sword)value;
3659 case R_X86_64_GOTPCREL:
3661 StgInt64 gotAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)->addr;
3662 StgInt64 off = gotAddress + A - P;
3663 *(Elf64_Word *)P = (Elf64_Word)off;
3667 case R_X86_64_PLT32:
3669 StgInt64 off = value - P;
3670 if (off >= 0x7fffffffL || off < -0x80000000L) {
3671 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3673 off = pltAddress + A - P;
3675 *(Elf64_Word *)P = (Elf64_Word)off;
3681 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3682 oc->fileName, (lnat)ELF_R_TYPE(info));
3691 ocResolve_ELF ( ObjectCode* oc )
3695 Elf_Sym* stab = NULL;
3696 char* ehdrC = (char*)(oc->image);
3697 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3698 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3700 /* first find "the" symbol table */
3701 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3703 /* also go find the string table */
3704 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3706 if (stab == NULL || strtab == NULL) {
3707 errorBelch("%s: can't find string or symbol table", oc->fileName);
3711 /* Process the relocation sections. */
3712 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3713 if (shdr[shnum].sh_type == SHT_REL) {
3714 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3715 shnum, stab, strtab );
3719 if (shdr[shnum].sh_type == SHT_RELA) {
3720 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3721 shnum, stab, strtab );
3726 #if defined(powerpc_HOST_ARCH)
3727 ocFlushInstructionCache( oc );
3735 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3736 * at the front. The following utility functions pack and unpack instructions, and
3737 * take care of the most common relocations.
3740 #ifdef ia64_HOST_ARCH
3743 ia64_extract_instruction(Elf64_Xword *target)
3746 int slot = (Elf_Addr)target & 3;
3747 target = (Elf_Addr)target & ~3;
3755 return ((w1 >> 5) & 0x1ffffffffff);
3757 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3761 barf("ia64_extract_instruction: invalid slot %p", target);
3766 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3768 int slot = (Elf_Addr)target & 3;
3769 target = (Elf_Addr)target & ~3;
3774 *target |= value << 5;
3777 *target |= value << 46;
3778 *(target+1) |= value >> 18;
3781 *(target+1) |= value << 23;
3787 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3789 Elf64_Xword instruction;
3790 Elf64_Sxword rel_value;
3792 rel_value = value - gp_val;
3793 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3794 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3796 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3797 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3798 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3799 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3800 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3801 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3805 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3807 Elf64_Xword instruction;
3808 Elf64_Sxword rel_value;
3811 entry = allocatePLTEntry(value, oc);
3813 rel_value = (entry >> 4) - (target >> 4);
3814 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3815 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3817 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3818 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3819 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3820 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3826 * PowerPC & X86_64 ELF specifics
3829 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3831 static int ocAllocateSymbolExtras_ELF( ObjectCode *oc )
3837 ehdr = (Elf_Ehdr *) oc->image;
3838 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3840 for( i = 0; i < ehdr->e_shnum; i++ )
3841 if( shdr[i].sh_type == SHT_SYMTAB )
3844 if( i == ehdr->e_shnum )
3846 errorBelch( "This ELF file contains no symtab" );
3850 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3852 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3853 (int) shdr[i].sh_entsize, (int) sizeof( Elf_Sym ) );
3858 return ocAllocateSymbolExtras( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3861 #endif /* powerpc */
3865 /* --------------------------------------------------------------------------
3867 * ------------------------------------------------------------------------*/
3869 #if defined(OBJFORMAT_MACHO)
3872 Support for MachO linking on Darwin/MacOS X
3873 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3875 I hereby formally apologize for the hackish nature of this code.
3876 Things that need to be done:
3877 *) implement ocVerifyImage_MachO
3878 *) add still more sanity checks.
3881 #if x86_64_HOST_ARCH || powerpc64_HOST_ARCH
3882 #define mach_header mach_header_64
3883 #define segment_command segment_command_64
3884 #define section section_64
3885 #define nlist nlist_64
3888 #ifdef powerpc_HOST_ARCH
3889 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3891 struct mach_header *header = (struct mach_header *) oc->image;
3892 struct load_command *lc = (struct load_command *) (header + 1);
3895 for( i = 0; i < header->ncmds; i++ )
3897 if( lc->cmd == LC_SYMTAB )
3899 // Find out the first and last undefined external
3900 // symbol, so we don't have to allocate too many
3902 struct symtab_command *symLC = (struct symtab_command *) lc;
3903 unsigned min = symLC->nsyms, max = 0;
3904 struct nlist *nlist =
3905 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3907 for(i=0;i<symLC->nsyms;i++)
3909 if(nlist[i].n_type & N_STAB)
3911 else if(nlist[i].n_type & N_EXT)
3913 if((nlist[i].n_type & N_TYPE) == N_UNDF
3914 && (nlist[i].n_value == 0))
3924 return ocAllocateSymbolExtras(oc, max - min + 1, min);
3929 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3931 return ocAllocateSymbolExtras(oc,0,0);
3934 #ifdef x86_64_HOST_ARCH
3935 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3937 struct mach_header *header = (struct mach_header *) oc->image;
3938 struct load_command *lc = (struct load_command *) (header + 1);
3941 for( i = 0; i < header->ncmds; i++ )
3943 if( lc->cmd == LC_SYMTAB )
3945 // Just allocate one entry for every symbol
3946 struct symtab_command *symLC = (struct symtab_command *) lc;
3948 return ocAllocateSymbolExtras(oc, symLC->nsyms, 0);
3951 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3953 return ocAllocateSymbolExtras(oc,0,0);
3957 static int ocVerifyImage_MachO(ObjectCode* oc)
3959 char *image = (char*) oc->image;
3960 struct mach_header *header = (struct mach_header*) image;
3962 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
3963 if(header->magic != MH_MAGIC_64)
3966 if(header->magic != MH_MAGIC)
3969 // FIXME: do some more verifying here
3973 static int resolveImports(
3976 struct symtab_command *symLC,
3977 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3978 unsigned long *indirectSyms,
3979 struct nlist *nlist)
3982 size_t itemSize = 4;
3985 int isJumpTable = 0;
3986 if(!strcmp(sect->sectname,"__jump_table"))
3990 ASSERT(sect->reserved2 == itemSize);
3994 for(i=0; i*itemSize < sect->size;i++)
3996 // according to otool, reserved1 contains the first index into the indirect symbol table
3997 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3998 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4001 if((symbol->n_type & N_TYPE) == N_UNDF
4002 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
4003 addr = (void*) (symbol->n_value);
4005 addr = lookupSymbol(nm);
4008 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
4016 checkProddableBlock(oc,image + sect->offset + i*itemSize);
4017 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
4018 *(unsigned*)(image + sect->offset + i*itemSize + 1)
4019 = (char*)addr - (image + sect->offset + i*itemSize + 5);
4024 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
4025 ((void**)(image + sect->offset))[i] = addr;
4032 static unsigned long relocateAddress(
4035 struct section* sections,
4036 unsigned long address)
4039 for(i = 0; i < nSections; i++)
4041 if(sections[i].addr <= address
4042 && address < sections[i].addr + sections[i].size)
4044 return (unsigned long)oc->image
4045 + sections[i].offset + address - sections[i].addr;
4048 barf("Invalid Mach-O file:"
4049 "Address out of bounds while relocating object file");
4053 static int relocateSection(
4056 struct symtab_command *symLC, struct nlist *nlist,
4057 int nSections, struct section* sections, struct section *sect)
4059 struct relocation_info *relocs;
4062 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
4064 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
4066 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
4068 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
4072 relocs = (struct relocation_info*) (image + sect->reloff);
4076 #ifdef x86_64_HOST_ARCH
4077 struct relocation_info *reloc = &relocs[i];
4079 char *thingPtr = image + sect->offset + reloc->r_address;
4083 int type = reloc->r_type;
4085 checkProddableBlock(oc,thingPtr);
4086 switch(reloc->r_length)
4089 thing = *(uint8_t*)thingPtr;
4090 baseValue = (uint64_t)thingPtr + 1;
4093 thing = *(uint16_t*)thingPtr;
4094 baseValue = (uint64_t)thingPtr + 2;
4097 thing = *(uint32_t*)thingPtr;
4098 baseValue = (uint64_t)thingPtr + 4;
4101 thing = *(uint64_t*)thingPtr;
4102 baseValue = (uint64_t)thingPtr + 8;
4105 barf("Unknown size.");
4108 if(type == X86_64_RELOC_GOT
4109 || type == X86_64_RELOC_GOT_LOAD)
4111 ASSERT(reloc->r_extern);
4112 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)->addr;
4114 type = X86_64_RELOC_SIGNED;
4116 else if(reloc->r_extern)
4118 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4119 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4120 if(symbol->n_value == 0)
4121 value = (uint64_t) lookupSymbol(nm);
4123 value = relocateAddress(oc, nSections, sections,
4128 value = sections[reloc->r_symbolnum-1].offset
4129 - sections[reloc->r_symbolnum-1].addr
4133 if(type == X86_64_RELOC_BRANCH)
4135 if((int32_t)(value - baseValue) != (int64_t)(value - baseValue))
4137 ASSERT(reloc->r_extern);
4138 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)
4141 ASSERT((int32_t)(value - baseValue) == (int64_t)(value - baseValue));
4142 type = X86_64_RELOC_SIGNED;
4147 case X86_64_RELOC_UNSIGNED:
4148 ASSERT(!reloc->r_pcrel);
4151 case X86_64_RELOC_SIGNED:
4152 ASSERT(reloc->r_pcrel);
4153 thing += value - baseValue;
4155 case X86_64_RELOC_SUBTRACTOR:
4156 ASSERT(!reloc->r_pcrel);
4160 barf("unkown relocation");
4163 switch(reloc->r_length)
4166 *(uint8_t*)thingPtr = thing;
4169 *(uint16_t*)thingPtr = thing;
4172 *(uint32_t*)thingPtr = thing;
4175 *(uint64_t*)thingPtr = thing;
4179 if(relocs[i].r_address & R_SCATTERED)
4181 struct scattered_relocation_info *scat =
4182 (struct scattered_relocation_info*) &relocs[i];
4186 if(scat->r_length == 2)
4188 unsigned long word = 0;
4189 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
4190 checkProddableBlock(oc,wordPtr);
4192 // Note on relocation types:
4193 // i386 uses the GENERIC_RELOC_* types,
4194 // while ppc uses special PPC_RELOC_* types.
4195 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
4196 // in both cases, all others are different.
4197 // Therefore, we use GENERIC_RELOC_VANILLA
4198 // and GENERIC_RELOC_PAIR instead of the PPC variants,
4199 // and use #ifdefs for the other types.
4201 // Step 1: Figure out what the relocated value should be
4202 if(scat->r_type == GENERIC_RELOC_VANILLA)
4204 word = *wordPtr + (unsigned long) relocateAddress(
4211 #ifdef powerpc_HOST_ARCH
4212 else if(scat->r_type == PPC_RELOC_SECTDIFF
4213 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
4214 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
4215 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
4217 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
4220 struct scattered_relocation_info *pair =
4221 (struct scattered_relocation_info*) &relocs[i+1];
4223 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
4224 barf("Invalid Mach-O file: "
4225 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
4227 word = (unsigned long)
4228 (relocateAddress(oc, nSections, sections, scat->r_value)
4229 - relocateAddress(oc, nSections, sections, pair->r_value));
4232 #ifdef powerpc_HOST_ARCH
4233 else if(scat->r_type == PPC_RELOC_HI16
4234 || scat->r_type == PPC_RELOC_LO16
4235 || scat->r_type == PPC_RELOC_HA16
4236 || scat->r_type == PPC_RELOC_LO14)
4237 { // these are generated by label+offset things
4238 struct relocation_info *pair = &relocs[i+1];
4239 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
4240 barf("Invalid Mach-O file: "
4241 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
4243 if(scat->r_type == PPC_RELOC_LO16)
4245 word = ((unsigned short*) wordPtr)[1];
4246 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4248 else if(scat->r_type == PPC_RELOC_LO14)
4250 barf("Unsupported Relocation: PPC_RELOC_LO14");
4251 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
4252 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4254 else if(scat->r_type == PPC_RELOC_HI16)
4256 word = ((unsigned short*) wordPtr)[1] << 16;
4257 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4259 else if(scat->r_type == PPC_RELOC_HA16)
4261 word = ((unsigned short*) wordPtr)[1] << 16;
4262 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4266 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4273 continue; // ignore the others
4275 #ifdef powerpc_HOST_ARCH
4276 if(scat->r_type == GENERIC_RELOC_VANILLA
4277 || scat->r_type == PPC_RELOC_SECTDIFF)
4279 if(scat->r_type == GENERIC_RELOC_VANILLA
4280 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4285 #ifdef powerpc_HOST_ARCH
4286 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4288 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4290 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4292 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4294 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4296 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4297 + ((word & (1<<15)) ? 1 : 0);
4303 continue; // FIXME: I hope it's OK to ignore all the others.
4307 struct relocation_info *reloc = &relocs[i];
4308 if(reloc->r_pcrel && !reloc->r_extern)
4311 if(reloc->r_length == 2)
4313 unsigned long word = 0;
4314 #ifdef powerpc_HOST_ARCH
4315 unsigned long jumpIsland = 0;
4316 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4317 // to avoid warning and to catch
4321 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4322 checkProddableBlock(oc,wordPtr);
4324 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4328 #ifdef powerpc_HOST_ARCH
4329 else if(reloc->r_type == PPC_RELOC_LO16)
4331 word = ((unsigned short*) wordPtr)[1];
4332 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4334 else if(reloc->r_type == PPC_RELOC_HI16)
4336 word = ((unsigned short*) wordPtr)[1] << 16;
4337 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4339 else if(reloc->r_type == PPC_RELOC_HA16)
4341 word = ((unsigned short*) wordPtr)[1] << 16;
4342 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4344 else if(reloc->r_type == PPC_RELOC_BR24)
4347 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4351 if(!reloc->r_extern)
4354 sections[reloc->r_symbolnum-1].offset
4355 - sections[reloc->r_symbolnum-1].addr
4362 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4363 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4364 void *symbolAddress = lookupSymbol(nm);
4367 errorBelch("\nunknown symbol `%s'", nm);
4373 #ifdef powerpc_HOST_ARCH
4374 // In the .o file, this should be a relative jump to NULL
4375 // and we'll change it to a relative jump to the symbol
4376 ASSERT(word + reloc->r_address == 0);
4377 jumpIsland = (unsigned long)
4378 &makeSymbolExtra(oc,
4380 (unsigned long) symbolAddress)
4384 offsetToJumpIsland = word + jumpIsland
4385 - (((long)image) + sect->offset - sect->addr);
4388 word += (unsigned long) symbolAddress
4389 - (((long)image) + sect->offset - sect->addr);
4393 word += (unsigned long) symbolAddress;
4397 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4402 #ifdef powerpc_HOST_ARCH
4403 else if(reloc->r_type == PPC_RELOC_LO16)
4405 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4408 else if(reloc->r_type == PPC_RELOC_HI16)
4410 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4413 else if(reloc->r_type == PPC_RELOC_HA16)
4415 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4416 + ((word & (1<<15)) ? 1 : 0);
4419 else if(reloc->r_type == PPC_RELOC_BR24)
4421 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4423 // The branch offset is too large.
4424 // Therefore, we try to use a jump island.
4427 barf("unconditional relative branch out of range: "
4428 "no jump island available");
4431 word = offsetToJumpIsland;
4432 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4433 barf("unconditional relative branch out of range: "
4434 "jump island out of range");
4436 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4441 barf("\nunknown relocation %d",reloc->r_type);
4449 static int ocGetNames_MachO(ObjectCode* oc)
4451 char *image = (char*) oc->image;
4452 struct mach_header *header = (struct mach_header*) image;
4453 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4454 unsigned i,curSymbol = 0;
4455 struct segment_command *segLC = NULL;
4456 struct section *sections;
4457 struct symtab_command *symLC = NULL;
4458 struct nlist *nlist;
4459 unsigned long commonSize = 0;
4460 char *commonStorage = NULL;
4461 unsigned long commonCounter;
4463 for(i=0;i<header->ncmds;i++)
4465 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4466 segLC = (struct segment_command*) lc;
4467 else if(lc->cmd == LC_SYMTAB)
4468 symLC = (struct symtab_command*) lc;
4469 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4472 sections = (struct section*) (segLC+1);
4473 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4477 barf("ocGetNames_MachO: no segment load command");
4479 for(i=0;i<segLC->nsects;i++)
4481 if(sections[i].size == 0)
4484 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4486 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4487 "ocGetNames_MachO(common symbols)");
4488 sections[i].offset = zeroFillArea - image;
4491 if(!strcmp(sections[i].sectname,"__text"))
4492 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4493 (void*) (image + sections[i].offset),
4494 (void*) (image + sections[i].offset + sections[i].size));
4495 else if(!strcmp(sections[i].sectname,"__const"))
4496 addSection(oc, SECTIONKIND_RWDATA,
4497 (void*) (image + sections[i].offset),
4498 (void*) (image + sections[i].offset + sections[i].size));
4499 else if(!strcmp(sections[i].sectname,"__data"))
4500 addSection(oc, SECTIONKIND_RWDATA,
4501 (void*) (image + sections[i].offset),
4502 (void*) (image + sections[i].offset + sections[i].size));
4503 else if(!strcmp(sections[i].sectname,"__bss")
4504 || !strcmp(sections[i].sectname,"__common"))
4505 addSection(oc, SECTIONKIND_RWDATA,
4506 (void*) (image + sections[i].offset),
4507 (void*) (image + sections[i].offset + sections[i].size));
4509 addProddableBlock(oc, (void*) (image + sections[i].offset),
4513 // count external symbols defined here
4517 for(i=0;i<symLC->nsyms;i++)
4519 if(nlist[i].n_type & N_STAB)
4521 else if(nlist[i].n_type & N_EXT)
4523 if((nlist[i].n_type & N_TYPE) == N_UNDF
4524 && (nlist[i].n_value != 0))
4526 commonSize += nlist[i].n_value;
4529 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4534 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4535 "ocGetNames_MachO(oc->symbols)");
4539 for(i=0;i<symLC->nsyms;i++)
4541 if(nlist[i].n_type & N_STAB)
4543 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4545 if(nlist[i].n_type & N_EXT)
4547 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4548 if((nlist[i].n_desc & N_WEAK_DEF) && lookupSymbol(nm))
4549 ; // weak definition, and we already have a definition
4552 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4554 + sections[nlist[i].n_sect-1].offset
4555 - sections[nlist[i].n_sect-1].addr
4556 + nlist[i].n_value);
4557 oc->symbols[curSymbol++] = nm;
4564 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4565 commonCounter = (unsigned long)commonStorage;
4568 for(i=0;i<symLC->nsyms;i++)
4570 if((nlist[i].n_type & N_TYPE) == N_UNDF
4571 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4573 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4574 unsigned long sz = nlist[i].n_value;
4576 nlist[i].n_value = commonCounter;
4578 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4579 (void*)commonCounter);
4580 oc->symbols[curSymbol++] = nm;
4582 commonCounter += sz;
4589 static int ocResolve_MachO(ObjectCode* oc)
4591 char *image = (char*) oc->image;
4592 struct mach_header *header = (struct mach_header*) image;
4593 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4595 struct segment_command *segLC = NULL;
4596 struct section *sections;
4597 struct symtab_command *symLC = NULL;
4598 struct dysymtab_command *dsymLC = NULL;
4599 struct nlist *nlist;
4601 for(i=0;i<header->ncmds;i++)
4603 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4604 segLC = (struct segment_command*) lc;
4605 else if(lc->cmd == LC_SYMTAB)
4606 symLC = (struct symtab_command*) lc;
4607 else if(lc->cmd == LC_DYSYMTAB)
4608 dsymLC = (struct dysymtab_command*) lc;
4609 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4612 sections = (struct section*) (segLC+1);
4613 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4618 unsigned long *indirectSyms
4619 = (unsigned long*) (image + dsymLC->indirectsymoff);
4621 for(i=0;i<segLC->nsects;i++)
4623 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4624 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4625 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4627 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4630 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4631 || !strcmp(sections[i].sectname,"__pointers"))
4633 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4636 else if(!strcmp(sections[i].sectname,"__jump_table"))
4638 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4644 for(i=0;i<segLC->nsects;i++)
4646 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4650 #if defined (powerpc_HOST_ARCH)
4651 ocFlushInstructionCache( oc );
4657 #ifdef powerpc_HOST_ARCH
4659 * The Mach-O object format uses leading underscores. But not everywhere.
4660 * There is a small number of runtime support functions defined in
4661 * libcc_dynamic.a whose name does not have a leading underscore.
4662 * As a consequence, we can't get their address from C code.
4663 * We have to use inline assembler just to take the address of a function.
4667 static void machoInitSymbolsWithoutUnderscore()
4669 extern void* symbolsWithoutUnderscore[];
4670 void **p = symbolsWithoutUnderscore;
4671 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4674 #define SymI_NeedsProto(x) \
4675 __asm__ volatile(".long " # x);
4677 RTS_MACHO_NOUNDERLINE_SYMBOLS
4679 __asm__ volatile(".text");
4682 #define SymI_NeedsProto(x) \
4683 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4685 RTS_MACHO_NOUNDERLINE_SYMBOLS
4692 * Figure out by how much to shift the entire Mach-O file in memory
4693 * when loading so that its single segment ends up 16-byte-aligned
4695 static int machoGetMisalignment( FILE * f )
4697 struct mach_header header;
4700 fread(&header, sizeof(header), 1, f);
4703 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
4704 if(header.magic != MH_MAGIC_64)
4707 if(header.magic != MH_MAGIC)
4711 misalignment = (header.sizeofcmds + sizeof(header))
4714 return misalignment ? (16 - misalignment) : 0;