1 /* -----------------------------------------------------------------------------
3 * (c) The GHC Team, 2000-2004
7 * ---------------------------------------------------------------------------*/
10 #include "PosixSource.h"
13 /* Linux needs _GNU_SOURCE to get RTLD_DEFAULT from <dlfcn.h> and
14 MREMAP_MAYMOVE from <sys/mman.h>.
25 #include "LinkerInternals.h"
29 #include "RtsTypeable.h"
33 #ifdef HAVE_SYS_TYPES_H
34 #include <sys/types.h>
40 #ifdef HAVE_SYS_STAT_H
44 #if defined(HAVE_DLFCN_H)
48 #if defined(cygwin32_HOST_OS)
53 #ifdef HAVE_SYS_TIME_H
57 #include <sys/fcntl.h>
58 #include <sys/termios.h>
59 #include <sys/utime.h>
60 #include <sys/utsname.h>
64 #if defined(ia64_HOST_ARCH) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
69 #if defined(linux_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
77 #if defined(linux_HOST_OS) || defined(solaris2_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
78 # define OBJFORMAT_ELF
79 #elif defined(cygwin32_HOST_OS) || defined (mingw32_HOST_OS)
80 # define OBJFORMAT_PEi386
83 #elif defined(darwin_HOST_OS)
84 # define OBJFORMAT_MACHO
85 # include <mach-o/loader.h>
86 # include <mach-o/nlist.h>
87 # include <mach-o/reloc.h>
88 #if !defined(HAVE_DLFCN_H)
89 # include <mach-o/dyld.h>
91 #if defined(powerpc_HOST_ARCH)
92 # include <mach-o/ppc/reloc.h>
94 #if defined(x86_64_HOST_ARCH)
95 # include <mach-o/x86_64/reloc.h>
99 /* Hash table mapping symbol names to Symbol */
100 static /*Str*/HashTable *symhash;
102 /* Hash table mapping symbol names to StgStablePtr */
103 static /*Str*/HashTable *stablehash;
105 /* List of currently loaded objects */
106 ObjectCode *objects = NULL; /* initially empty */
108 #if defined(OBJFORMAT_ELF)
109 static int ocVerifyImage_ELF ( ObjectCode* oc );
110 static int ocGetNames_ELF ( ObjectCode* oc );
111 static int ocResolve_ELF ( ObjectCode* oc );
112 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
113 static int ocAllocateSymbolExtras_ELF ( ObjectCode* oc );
115 #elif defined(OBJFORMAT_PEi386)
116 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
117 static int ocGetNames_PEi386 ( ObjectCode* oc );
118 static int ocResolve_PEi386 ( ObjectCode* oc );
119 static void *lookupSymbolInDLLs ( unsigned char *lbl );
120 static void zapTrailingAtSign ( unsigned char *sym );
121 #elif defined(OBJFORMAT_MACHO)
122 static int ocVerifyImage_MachO ( ObjectCode* oc );
123 static int ocGetNames_MachO ( ObjectCode* oc );
124 static int ocResolve_MachO ( ObjectCode* oc );
126 static int machoGetMisalignment( FILE * );
127 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
128 static int ocAllocateSymbolExtras_MachO ( ObjectCode* oc );
130 #ifdef powerpc_HOST_ARCH
131 static void machoInitSymbolsWithoutUnderscore( void );
135 /* on x86_64 we have a problem with relocating symbol references in
136 * code that was compiled without -fPIC. By default, the small memory
137 * model is used, which assumes that symbol references can fit in a
138 * 32-bit slot. The system dynamic linker makes this work for
139 * references to shared libraries by either (a) allocating a jump
140 * table slot for code references, or (b) moving the symbol at load
141 * time (and copying its contents, if necessary) for data references.
143 * We unfortunately can't tell whether symbol references are to code
144 * or data. So for now we assume they are code (the vast majority
145 * are), and allocate jump-table slots. Unfortunately this will
146 * SILENTLY generate crashing code for data references. This hack is
147 * enabled by X86_64_ELF_NONPIC_HACK.
149 * One workaround is to use shared Haskell libraries. This is
150 * coming. Another workaround is to keep the static libraries but
151 * compile them with -fPIC, because that will generate PIC references
152 * to data which can be relocated. The PIC code is still too green to
153 * do this systematically, though.
156 * See thread http://www.haskell.org/pipermail/cvs-ghc/2007-September/038458.html
158 * Naming Scheme for Symbol Macros
160 * SymI_*: symbol is internal to the RTS. It resides in an object
161 * file/library that is statically.
162 * SymE_*: symbol is external to the RTS library. It might be linked
165 * Sym*_HasProto : the symbol prototype is imported in an include file
166 * or defined explicitly
167 * Sym*_NeedsProto: the symbol is undefined and we add a dummy
168 * default proto extern void sym(void);
170 #define X86_64_ELF_NONPIC_HACK 1
172 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
173 * small memory model on this architecture (see gcc docs,
176 * MAP_32BIT not available on OpenBSD/amd64
178 #if defined(x86_64_HOST_ARCH) && defined(MAP_32BIT)
179 #define TRY_MAP_32BIT MAP_32BIT
181 #define TRY_MAP_32BIT 0
185 * Due to the small memory model (see above), on x86_64 we have to map
186 * all our non-PIC object files into the low 2Gb of the address space
187 * (why 2Gb and not 4Gb? Because all addresses must be reachable
188 * using a 32-bit signed PC-relative offset). On Linux we can do this
189 * using the MAP_32BIT flag to mmap(), however on other OSs
190 * (e.g. *BSD, see #2063, and also on Linux inside Xen, see #2512), we
191 * can't do this. So on these systems, we have to pick a base address
192 * in the low 2Gb of the address space and try to allocate memory from
195 * We pick a default address based on the OS, but also make this
196 * configurable via an RTS flag (+RTS -xm)
198 #if defined(x86_64_HOST_ARCH)
200 #if defined(MAP_32BIT)
201 // Try to use MAP_32BIT
202 #define MMAP_32BIT_BASE_DEFAULT 0
205 #define MMAP_32BIT_BASE_DEFAULT 0x40000000
208 static void *mmap_32bit_base = MMAP_32BIT_BASE_DEFAULT;
211 /* MAP_ANONYMOUS is MAP_ANON on some systems, e.g. OpenBSD */
212 #if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
213 #define MAP_ANONYMOUS MAP_ANON
216 /* -----------------------------------------------------------------------------
217 * Built-in symbols from the RTS
220 typedef struct _RtsSymbolVal {
226 #define Maybe_Stable_Names SymI_HasProto(mkWeakzh_fast) \
227 SymI_HasProto(mkWeakForeignEnvzh_fast) \
228 SymI_HasProto(makeStableNamezh_fast) \
229 SymI_HasProto(finalizzeWeakzh_fast)
231 /* These are not available in GUM!!! -- HWL */
232 #define Maybe_Stable_Names
235 #if !defined (mingw32_HOST_OS)
236 #define RTS_POSIX_ONLY_SYMBOLS \
237 SymI_HasProto(shutdownHaskellAndSignal) \
238 SymI_NeedsProto(lockFile) \
239 SymI_NeedsProto(unlockFile) \
240 SymI_HasProto(signal_handlers) \
241 SymI_HasProto(stg_sig_install) \
242 SymI_NeedsProto(nocldstop)
245 #if defined (cygwin32_HOST_OS)
246 #define RTS_MINGW_ONLY_SYMBOLS /**/
247 /* Don't have the ability to read import libs / archives, so
248 * we have to stupidly list a lot of what libcygwin.a
251 #define RTS_CYGWIN_ONLY_SYMBOLS \
252 SymI_HasProto(regfree) \
253 SymI_HasProto(regexec) \
254 SymI_HasProto(regerror) \
255 SymI_HasProto(regcomp) \
256 SymI_HasProto(__errno) \
257 SymI_HasProto(access) \
258 SymI_HasProto(chmod) \
259 SymI_HasProto(chdir) \
260 SymI_HasProto(close) \
261 SymI_HasProto(creat) \
263 SymI_HasProto(dup2) \
264 SymI_HasProto(fstat) \
265 SymI_HasProto(fcntl) \
266 SymI_HasProto(getcwd) \
267 SymI_HasProto(getenv) \
268 SymI_HasProto(lseek) \
269 SymI_HasProto(open) \
270 SymI_HasProto(fpathconf) \
271 SymI_HasProto(pathconf) \
272 SymI_HasProto(stat) \
274 SymI_HasProto(tanh) \
275 SymI_HasProto(cosh) \
276 SymI_HasProto(sinh) \
277 SymI_HasProto(atan) \
278 SymI_HasProto(acos) \
279 SymI_HasProto(asin) \
285 SymI_HasProto(sqrt) \
286 SymI_HasProto(localtime_r) \
287 SymI_HasProto(gmtime_r) \
288 SymI_HasProto(mktime) \
289 SymI_NeedsProto(_imp___tzname) \
290 SymI_HasProto(gettimeofday) \
291 SymI_HasProto(timezone) \
292 SymI_HasProto(tcgetattr) \
293 SymI_HasProto(tcsetattr) \
294 SymI_HasProto(memcpy) \
295 SymI_HasProto(memmove) \
296 SymI_HasProto(realloc) \
297 SymI_HasProto(malloc) \
298 SymI_HasProto(free) \
299 SymI_HasProto(fork) \
300 SymI_HasProto(lstat) \
301 SymI_HasProto(isatty) \
302 SymI_HasProto(mkdir) \
303 SymI_HasProto(opendir) \
304 SymI_HasProto(readdir) \
305 SymI_HasProto(rewinddir) \
306 SymI_HasProto(closedir) \
307 SymI_HasProto(link) \
308 SymI_HasProto(mkfifo) \
309 SymI_HasProto(pipe) \
310 SymI_HasProto(read) \
311 SymI_HasProto(rename) \
312 SymI_HasProto(rmdir) \
313 SymI_HasProto(select) \
314 SymI_HasProto(system) \
315 SymI_HasProto(write) \
316 SymI_HasProto(strcmp) \
317 SymI_HasProto(strcpy) \
318 SymI_HasProto(strncpy) \
319 SymI_HasProto(strerror) \
320 SymI_HasProto(sigaddset) \
321 SymI_HasProto(sigemptyset) \
322 SymI_HasProto(sigprocmask) \
323 SymI_HasProto(umask) \
324 SymI_HasProto(uname) \
325 SymI_HasProto(unlink) \
326 SymI_HasProto(utime) \
327 SymI_HasProto(waitpid)
329 #elif !defined(mingw32_HOST_OS)
330 #define RTS_MINGW_ONLY_SYMBOLS /**/
331 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
332 #else /* defined(mingw32_HOST_OS) */
333 #define RTS_POSIX_ONLY_SYMBOLS /**/
334 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
336 /* Extra syms gen'ed by mingw-2's gcc-3.2: */
338 #define RTS_MINGW_EXTRA_SYMS \
339 SymI_NeedsProto(_imp____mb_cur_max) \
340 SymI_NeedsProto(_imp___pctype)
342 #define RTS_MINGW_EXTRA_SYMS
345 #if HAVE_GETTIMEOFDAY
346 #define RTS_MINGW_GETTIMEOFDAY_SYM SymI_NeedsProto(gettimeofday)
348 #define RTS_MINGW_GETTIMEOFDAY_SYM /**/
351 /* These are statically linked from the mingw libraries into the ghc
352 executable, so we have to employ this hack. */
353 #define RTS_MINGW_ONLY_SYMBOLS \
354 SymI_HasProto(asyncReadzh_fast) \
355 SymI_HasProto(asyncWritezh_fast) \
356 SymI_HasProto(asyncDoProczh_fast) \
357 SymI_HasProto(memset) \
358 SymI_HasProto(inet_ntoa) \
359 SymI_HasProto(inet_addr) \
360 SymI_HasProto(htonl) \
361 SymI_HasProto(recvfrom) \
362 SymI_HasProto(listen) \
363 SymI_HasProto(bind) \
364 SymI_HasProto(shutdown) \
365 SymI_HasProto(connect) \
366 SymI_HasProto(htons) \
367 SymI_HasProto(ntohs) \
368 SymI_HasProto(getservbyname) \
369 SymI_HasProto(getservbyport) \
370 SymI_HasProto(getprotobynumber) \
371 SymI_HasProto(getprotobyname) \
372 SymI_HasProto(gethostbyname) \
373 SymI_HasProto(gethostbyaddr) \
374 SymI_HasProto(gethostname) \
375 SymI_HasProto(strcpy) \
376 SymI_HasProto(strncpy) \
377 SymI_HasProto(abort) \
378 SymI_NeedsProto(_alloca) \
379 SymI_NeedsProto(isxdigit) \
380 SymI_NeedsProto(isupper) \
381 SymI_NeedsProto(ispunct) \
382 SymI_NeedsProto(islower) \
383 SymI_NeedsProto(isspace) \
384 SymI_NeedsProto(isprint) \
385 SymI_NeedsProto(isdigit) \
386 SymI_NeedsProto(iscntrl) \
387 SymI_NeedsProto(isalpha) \
388 SymI_NeedsProto(isalnum) \
389 SymI_HasProto(strcmp) \
390 SymI_HasProto(memmove) \
391 SymI_HasProto(realloc) \
392 SymI_HasProto(malloc) \
394 SymI_HasProto(tanh) \
395 SymI_HasProto(cosh) \
396 SymI_HasProto(sinh) \
397 SymI_HasProto(atan) \
398 SymI_HasProto(acos) \
399 SymI_HasProto(asin) \
405 SymI_HasProto(sqrt) \
406 SymI_HasProto(powf) \
407 SymI_HasProto(tanhf) \
408 SymI_HasProto(coshf) \
409 SymI_HasProto(sinhf) \
410 SymI_HasProto(atanf) \
411 SymI_HasProto(acosf) \
412 SymI_HasProto(asinf) \
413 SymI_HasProto(tanf) \
414 SymI_HasProto(cosf) \
415 SymI_HasProto(sinf) \
416 SymI_HasProto(expf) \
417 SymI_HasProto(logf) \
418 SymI_HasProto(sqrtf) \
419 SymI_HasProto(memcpy) \
420 SymI_HasProto(rts_InstallConsoleEvent) \
421 SymI_HasProto(rts_ConsoleHandlerDone) \
422 SymI_NeedsProto(mktime) \
423 SymI_NeedsProto(_imp___timezone) \
424 SymI_NeedsProto(_imp___tzname) \
425 SymI_NeedsProto(_imp__tzname) \
426 SymI_NeedsProto(_imp___iob) \
427 SymI_NeedsProto(_imp___osver) \
428 SymI_NeedsProto(localtime) \
429 SymI_NeedsProto(gmtime) \
430 SymI_NeedsProto(opendir) \
431 SymI_NeedsProto(readdir) \
432 SymI_NeedsProto(rewinddir) \
433 RTS_MINGW_EXTRA_SYMS \
434 RTS_MINGW_GETTIMEOFDAY_SYM \
435 SymI_NeedsProto(closedir)
438 #if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
439 #define RTS_DARWIN_ONLY_SYMBOLS \
440 SymI_NeedsProto(asprintf$LDBLStub) \
441 SymI_NeedsProto(err$LDBLStub) \
442 SymI_NeedsProto(errc$LDBLStub) \
443 SymI_NeedsProto(errx$LDBLStub) \
444 SymI_NeedsProto(fprintf$LDBLStub) \
445 SymI_NeedsProto(fscanf$LDBLStub) \
446 SymI_NeedsProto(fwprintf$LDBLStub) \
447 SymI_NeedsProto(fwscanf$LDBLStub) \
448 SymI_NeedsProto(printf$LDBLStub) \
449 SymI_NeedsProto(scanf$LDBLStub) \
450 SymI_NeedsProto(snprintf$LDBLStub) \
451 SymI_NeedsProto(sprintf$LDBLStub) \
452 SymI_NeedsProto(sscanf$LDBLStub) \
453 SymI_NeedsProto(strtold$LDBLStub) \
454 SymI_NeedsProto(swprintf$LDBLStub) \
455 SymI_NeedsProto(swscanf$LDBLStub) \
456 SymI_NeedsProto(syslog$LDBLStub) \
457 SymI_NeedsProto(vasprintf$LDBLStub) \
458 SymI_NeedsProto(verr$LDBLStub) \
459 SymI_NeedsProto(verrc$LDBLStub) \
460 SymI_NeedsProto(verrx$LDBLStub) \
461 SymI_NeedsProto(vfprintf$LDBLStub) \
462 SymI_NeedsProto(vfscanf$LDBLStub) \
463 SymI_NeedsProto(vfwprintf$LDBLStub) \
464 SymI_NeedsProto(vfwscanf$LDBLStub) \
465 SymI_NeedsProto(vprintf$LDBLStub) \
466 SymI_NeedsProto(vscanf$LDBLStub) \
467 SymI_NeedsProto(vsnprintf$LDBLStub) \
468 SymI_NeedsProto(vsprintf$LDBLStub) \
469 SymI_NeedsProto(vsscanf$LDBLStub) \
470 SymI_NeedsProto(vswprintf$LDBLStub) \
471 SymI_NeedsProto(vswscanf$LDBLStub) \
472 SymI_NeedsProto(vsyslog$LDBLStub) \
473 SymI_NeedsProto(vwarn$LDBLStub) \
474 SymI_NeedsProto(vwarnc$LDBLStub) \
475 SymI_NeedsProto(vwarnx$LDBLStub) \
476 SymI_NeedsProto(vwprintf$LDBLStub) \
477 SymI_NeedsProto(vwscanf$LDBLStub) \
478 SymI_NeedsProto(warn$LDBLStub) \
479 SymI_NeedsProto(warnc$LDBLStub) \
480 SymI_NeedsProto(warnx$LDBLStub) \
481 SymI_NeedsProto(wcstold$LDBLStub) \
482 SymI_NeedsProto(wprintf$LDBLStub) \
483 SymI_NeedsProto(wscanf$LDBLStub)
485 #define RTS_DARWIN_ONLY_SYMBOLS
489 # define MAIN_CAP_SYM SymI_HasProto(MainCapability)
491 # define MAIN_CAP_SYM
494 #if !defined(mingw32_HOST_OS)
495 #define RTS_USER_SIGNALS_SYMBOLS \
496 SymI_HasProto(setIOManagerPipe)
498 #define RTS_USER_SIGNALS_SYMBOLS \
499 SymI_HasProto(sendIOManagerEvent) \
500 SymI_HasProto(readIOManagerEvent) \
501 SymI_HasProto(getIOManagerEvent) \
502 SymI_HasProto(console_handler)
505 #define RTS_LIBFFI_SYMBOLS \
506 SymE_NeedsProto(ffi_prep_cif) \
507 SymE_NeedsProto(ffi_call) \
508 SymE_NeedsProto(ffi_type_void) \
509 SymE_NeedsProto(ffi_type_float) \
510 SymE_NeedsProto(ffi_type_double) \
511 SymE_NeedsProto(ffi_type_sint64) \
512 SymE_NeedsProto(ffi_type_uint64) \
513 SymE_NeedsProto(ffi_type_sint32) \
514 SymE_NeedsProto(ffi_type_uint32) \
515 SymE_NeedsProto(ffi_type_sint16) \
516 SymE_NeedsProto(ffi_type_uint16) \
517 SymE_NeedsProto(ffi_type_sint8) \
518 SymE_NeedsProto(ffi_type_uint8) \
519 SymE_NeedsProto(ffi_type_pointer)
521 #ifdef TABLES_NEXT_TO_CODE
522 #define RTS_RET_SYMBOLS /* nothing */
524 #define RTS_RET_SYMBOLS \
525 SymI_HasProto(stg_enter_ret) \
526 SymI_HasProto(stg_gc_fun_ret) \
527 SymI_HasProto(stg_ap_v_ret) \
528 SymI_HasProto(stg_ap_f_ret) \
529 SymI_HasProto(stg_ap_d_ret) \
530 SymI_HasProto(stg_ap_l_ret) \
531 SymI_HasProto(stg_ap_n_ret) \
532 SymI_HasProto(stg_ap_p_ret) \
533 SymI_HasProto(stg_ap_pv_ret) \
534 SymI_HasProto(stg_ap_pp_ret) \
535 SymI_HasProto(stg_ap_ppv_ret) \
536 SymI_HasProto(stg_ap_ppp_ret) \
537 SymI_HasProto(stg_ap_pppv_ret) \
538 SymI_HasProto(stg_ap_pppp_ret) \
539 SymI_HasProto(stg_ap_ppppp_ret) \
540 SymI_HasProto(stg_ap_pppppp_ret)
543 /* On Windows, we link libgmp.a statically into libHSrts.dll */
544 #ifdef mingw32_HOST_OS
546 SymI_HasProto(__gmpz_cmp) \
547 SymI_HasProto(__gmpz_cmp_si) \
548 SymI_HasProto(__gmpz_cmp_ui) \
549 SymI_HasProto(__gmpz_get_si) \
550 SymI_HasProto(__gmpz_get_ui)
553 SymE_HasProto(__gmpz_cmp) \
554 SymE_HasProto(__gmpz_cmp_si) \
555 SymE_HasProto(__gmpz_cmp_ui) \
556 SymE_HasProto(__gmpz_get_si) \
557 SymE_HasProto(__gmpz_get_ui)
560 #define RTS_SYMBOLS \
562 SymI_HasProto(StgReturn) \
563 SymI_HasProto(stg_enter_info) \
564 SymI_HasProto(stg_gc_void_info) \
565 SymI_HasProto(__stg_gc_enter_1) \
566 SymI_HasProto(stg_gc_noregs) \
567 SymI_HasProto(stg_gc_unpt_r1_info) \
568 SymI_HasProto(stg_gc_unpt_r1) \
569 SymI_HasProto(stg_gc_unbx_r1_info) \
570 SymI_HasProto(stg_gc_unbx_r1) \
571 SymI_HasProto(stg_gc_f1_info) \
572 SymI_HasProto(stg_gc_f1) \
573 SymI_HasProto(stg_gc_d1_info) \
574 SymI_HasProto(stg_gc_d1) \
575 SymI_HasProto(stg_gc_l1_info) \
576 SymI_HasProto(stg_gc_l1) \
577 SymI_HasProto(__stg_gc_fun) \
578 SymI_HasProto(stg_gc_fun_info) \
579 SymI_HasProto(stg_gc_gen) \
580 SymI_HasProto(stg_gc_gen_info) \
581 SymI_HasProto(stg_gc_gen_hp) \
582 SymI_HasProto(stg_gc_ut) \
583 SymI_HasProto(stg_gen_yield) \
584 SymI_HasProto(stg_yield_noregs) \
585 SymI_HasProto(stg_yield_to_interpreter) \
586 SymI_HasProto(stg_gen_block) \
587 SymI_HasProto(stg_block_noregs) \
588 SymI_HasProto(stg_block_1) \
589 SymI_HasProto(stg_block_takemvar) \
590 SymI_HasProto(stg_block_putmvar) \
592 SymI_HasProto(MallocFailHook) \
593 SymI_HasProto(OnExitHook) \
594 SymI_HasProto(OutOfHeapHook) \
595 SymI_HasProto(StackOverflowHook) \
596 SymI_HasProto(__encodeDouble) \
597 SymI_HasProto(__encodeFloat) \
598 SymI_HasProto(addDLL) \
600 SymI_HasProto(__int_encodeDouble) \
601 SymI_HasProto(__word_encodeDouble) \
602 SymI_HasProto(__2Int_encodeDouble) \
603 SymI_HasProto(__int_encodeFloat) \
604 SymI_HasProto(__word_encodeFloat) \
605 SymI_HasProto(andIntegerzh_fast) \
606 SymI_HasProto(atomicallyzh_fast) \
607 SymI_HasProto(barf) \
608 SymI_HasProto(debugBelch) \
609 SymI_HasProto(errorBelch) \
610 SymI_HasProto(asyncExceptionsBlockedzh_fast) \
611 SymI_HasProto(blockAsyncExceptionszh_fast) \
612 SymI_HasProto(catchzh_fast) \
613 SymI_HasProto(catchRetryzh_fast) \
614 SymI_HasProto(catchSTMzh_fast) \
615 SymI_HasProto(checkzh_fast) \
616 SymI_HasProto(closure_flags) \
617 SymI_HasProto(cmp_thread) \
618 SymI_HasProto(cmpIntegerzh_fast) \
619 SymI_HasProto(cmpIntegerIntzh_fast) \
620 SymI_HasProto(complementIntegerzh_fast) \
621 SymI_HasProto(createAdjustor) \
622 SymI_HasProto(decodeDoublezh_fast) \
623 SymI_HasProto(decodeFloatzh_fast) \
624 SymI_HasProto(decodeDoublezu2Intzh_fast) \
625 SymI_HasProto(decodeFloatzuIntzh_fast) \
626 SymI_HasProto(defaultsHook) \
627 SymI_HasProto(delayzh_fast) \
628 SymI_HasProto(deRefWeakzh_fast) \
629 SymI_HasProto(deRefStablePtrzh_fast) \
630 SymI_HasProto(dirty_MUT_VAR) \
631 SymI_HasProto(divExactIntegerzh_fast) \
632 SymI_HasProto(divModIntegerzh_fast) \
633 SymI_HasProto(forkzh_fast) \
634 SymI_HasProto(forkOnzh_fast) \
635 SymI_HasProto(forkProcess) \
636 SymI_HasProto(forkOS_createThread) \
637 SymI_HasProto(freeHaskellFunctionPtr) \
638 SymI_HasProto(freeStablePtr) \
639 SymI_HasProto(getOrSetTypeableStore) \
640 SymI_HasProto(gcdIntegerzh_fast) \
641 SymI_HasProto(gcdIntegerIntzh_fast) \
642 SymI_HasProto(gcdIntzh_fast) \
643 SymI_HasProto(genSymZh) \
644 SymI_HasProto(genericRaise) \
645 SymI_HasProto(getProgArgv) \
646 SymI_HasProto(getFullProgArgv) \
647 SymI_HasProto(getStablePtr) \
648 SymI_HasProto(hs_init) \
649 SymI_HasProto(hs_exit) \
650 SymI_HasProto(hs_set_argv) \
651 SymI_HasProto(hs_add_root) \
652 SymI_HasProto(hs_perform_gc) \
653 SymI_HasProto(hs_free_stable_ptr) \
654 SymI_HasProto(hs_free_fun_ptr) \
655 SymI_HasProto(hs_hpc_rootModule) \
656 SymI_HasProto(initLinker) \
657 SymI_HasProto(unpackClosurezh_fast) \
658 SymI_HasProto(getApStackValzh_fast) \
659 SymI_HasProto(getSparkzh_fast) \
660 SymI_HasProto(int2Integerzh_fast) \
661 SymI_HasProto(integer2Intzh_fast) \
662 SymI_HasProto(integer2Wordzh_fast) \
663 SymI_HasProto(isCurrentThreadBoundzh_fast) \
664 SymI_HasProto(isDoubleDenormalized) \
665 SymI_HasProto(isDoubleInfinite) \
666 SymI_HasProto(isDoubleNaN) \
667 SymI_HasProto(isDoubleNegativeZero) \
668 SymI_HasProto(isEmptyMVarzh_fast) \
669 SymI_HasProto(isFloatDenormalized) \
670 SymI_HasProto(isFloatInfinite) \
671 SymI_HasProto(isFloatNaN) \
672 SymI_HasProto(isFloatNegativeZero) \
673 SymI_HasProto(killThreadzh_fast) \
674 SymI_HasProto(loadObj) \
675 SymI_HasProto(insertStableSymbol) \
676 SymI_HasProto(insertSymbol) \
677 SymI_HasProto(lookupSymbol) \
678 SymI_HasProto(makeStablePtrzh_fast) \
679 SymI_HasProto(minusIntegerzh_fast) \
680 SymI_HasProto(mkApUpd0zh_fast) \
681 SymI_HasProto(myThreadIdzh_fast) \
682 SymI_HasProto(labelThreadzh_fast) \
683 SymI_HasProto(newArrayzh_fast) \
684 SymI_HasProto(newBCOzh_fast) \
685 SymI_HasProto(newByteArrayzh_fast) \
686 SymI_HasProto_redirect(newCAF, newDynCAF) \
687 SymI_HasProto(newMVarzh_fast) \
688 SymI_HasProto(newMutVarzh_fast) \
689 SymI_HasProto(newTVarzh_fast) \
690 SymI_HasProto(noDuplicatezh_fast) \
691 SymI_HasProto(atomicModifyMutVarzh_fast) \
692 SymI_HasProto(newPinnedByteArrayzh_fast) \
693 SymI_HasProto(newSpark) \
694 SymI_HasProto(orIntegerzh_fast) \
695 SymI_HasProto(performGC) \
696 SymI_HasProto(performMajorGC) \
697 SymI_HasProto(plusIntegerzh_fast) \
698 SymI_HasProto(prog_argc) \
699 SymI_HasProto(prog_argv) \
700 SymI_HasProto(putMVarzh_fast) \
701 SymI_HasProto(quotIntegerzh_fast) \
702 SymI_HasProto(quotRemIntegerzh_fast) \
703 SymI_HasProto(raisezh_fast) \
704 SymI_HasProto(raiseIOzh_fast) \
705 SymI_HasProto(readTVarzh_fast) \
706 SymI_HasProto(readTVarIOzh_fast) \
707 SymI_HasProto(remIntegerzh_fast) \
708 SymI_HasProto(resetNonBlockingFd) \
709 SymI_HasProto(resumeThread) \
710 SymI_HasProto(resolveObjs) \
711 SymI_HasProto(retryzh_fast) \
712 SymI_HasProto(rts_apply) \
713 SymI_HasProto(rts_checkSchedStatus) \
714 SymI_HasProto(rts_eval) \
715 SymI_HasProto(rts_evalIO) \
716 SymI_HasProto(rts_evalLazyIO) \
717 SymI_HasProto(rts_evalStableIO) \
718 SymI_HasProto(rts_eval_) \
719 SymI_HasProto(rts_getBool) \
720 SymI_HasProto(rts_getChar) \
721 SymI_HasProto(rts_getDouble) \
722 SymI_HasProto(rts_getFloat) \
723 SymI_HasProto(rts_getInt) \
724 SymI_HasProto(rts_getInt8) \
725 SymI_HasProto(rts_getInt16) \
726 SymI_HasProto(rts_getInt32) \
727 SymI_HasProto(rts_getInt64) \
728 SymI_HasProto(rts_getPtr) \
729 SymI_HasProto(rts_getFunPtr) \
730 SymI_HasProto(rts_getStablePtr) \
731 SymI_HasProto(rts_getThreadId) \
732 SymI_HasProto(rts_getWord) \
733 SymI_HasProto(rts_getWord8) \
734 SymI_HasProto(rts_getWord16) \
735 SymI_HasProto(rts_getWord32) \
736 SymI_HasProto(rts_getWord64) \
737 SymI_HasProto(rts_lock) \
738 SymI_HasProto(rts_mkBool) \
739 SymI_HasProto(rts_mkChar) \
740 SymI_HasProto(rts_mkDouble) \
741 SymI_HasProto(rts_mkFloat) \
742 SymI_HasProto(rts_mkInt) \
743 SymI_HasProto(rts_mkInt8) \
744 SymI_HasProto(rts_mkInt16) \
745 SymI_HasProto(rts_mkInt32) \
746 SymI_HasProto(rts_mkInt64) \
747 SymI_HasProto(rts_mkPtr) \
748 SymI_HasProto(rts_mkFunPtr) \
749 SymI_HasProto(rts_mkStablePtr) \
750 SymI_HasProto(rts_mkString) \
751 SymI_HasProto(rts_mkWord) \
752 SymI_HasProto(rts_mkWord8) \
753 SymI_HasProto(rts_mkWord16) \
754 SymI_HasProto(rts_mkWord32) \
755 SymI_HasProto(rts_mkWord64) \
756 SymI_HasProto(rts_unlock) \
757 SymI_HasProto(rtsSupportsBoundThreads) \
758 SymI_HasProto(__hscore_get_saved_termios) \
759 SymI_HasProto(__hscore_set_saved_termios) \
760 SymI_HasProto(setProgArgv) \
761 SymI_HasProto(startupHaskell) \
762 SymI_HasProto(shutdownHaskell) \
763 SymI_HasProto(shutdownHaskellAndExit) \
764 SymI_HasProto(stable_ptr_table) \
765 SymI_HasProto(stackOverflow) \
766 SymI_HasProto(stg_CAF_BLACKHOLE_info) \
767 SymI_HasProto(__stg_EAGER_BLACKHOLE_info) \
768 SymI_HasProto(awakenBlockedQueue) \
769 SymI_HasProto(startTimer) \
770 SymI_HasProto(stg_CHARLIKE_closure) \
771 SymI_HasProto(stg_MVAR_CLEAN_info) \
772 SymI_HasProto(stg_MVAR_DIRTY_info) \
773 SymI_HasProto(stg_IND_STATIC_info) \
774 SymI_HasProto(stg_INTLIKE_closure) \
775 SymI_HasProto(stg_MUT_ARR_PTRS_DIRTY_info) \
776 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN_info) \
777 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN0_info) \
778 SymI_HasProto(stg_WEAK_info) \
779 SymI_HasProto(stg_ap_v_info) \
780 SymI_HasProto(stg_ap_f_info) \
781 SymI_HasProto(stg_ap_d_info) \
782 SymI_HasProto(stg_ap_l_info) \
783 SymI_HasProto(stg_ap_n_info) \
784 SymI_HasProto(stg_ap_p_info) \
785 SymI_HasProto(stg_ap_pv_info) \
786 SymI_HasProto(stg_ap_pp_info) \
787 SymI_HasProto(stg_ap_ppv_info) \
788 SymI_HasProto(stg_ap_ppp_info) \
789 SymI_HasProto(stg_ap_pppv_info) \
790 SymI_HasProto(stg_ap_pppp_info) \
791 SymI_HasProto(stg_ap_ppppp_info) \
792 SymI_HasProto(stg_ap_pppppp_info) \
793 SymI_HasProto(stg_ap_0_fast) \
794 SymI_HasProto(stg_ap_v_fast) \
795 SymI_HasProto(stg_ap_f_fast) \
796 SymI_HasProto(stg_ap_d_fast) \
797 SymI_HasProto(stg_ap_l_fast) \
798 SymI_HasProto(stg_ap_n_fast) \
799 SymI_HasProto(stg_ap_p_fast) \
800 SymI_HasProto(stg_ap_pv_fast) \
801 SymI_HasProto(stg_ap_pp_fast) \
802 SymI_HasProto(stg_ap_ppv_fast) \
803 SymI_HasProto(stg_ap_ppp_fast) \
804 SymI_HasProto(stg_ap_pppv_fast) \
805 SymI_HasProto(stg_ap_pppp_fast) \
806 SymI_HasProto(stg_ap_ppppp_fast) \
807 SymI_HasProto(stg_ap_pppppp_fast) \
808 SymI_HasProto(stg_ap_1_upd_info) \
809 SymI_HasProto(stg_ap_2_upd_info) \
810 SymI_HasProto(stg_ap_3_upd_info) \
811 SymI_HasProto(stg_ap_4_upd_info) \
812 SymI_HasProto(stg_ap_5_upd_info) \
813 SymI_HasProto(stg_ap_6_upd_info) \
814 SymI_HasProto(stg_ap_7_upd_info) \
815 SymI_HasProto(stg_exit) \
816 SymI_HasProto(stg_sel_0_upd_info) \
817 SymI_HasProto(stg_sel_10_upd_info) \
818 SymI_HasProto(stg_sel_11_upd_info) \
819 SymI_HasProto(stg_sel_12_upd_info) \
820 SymI_HasProto(stg_sel_13_upd_info) \
821 SymI_HasProto(stg_sel_14_upd_info) \
822 SymI_HasProto(stg_sel_15_upd_info) \
823 SymI_HasProto(stg_sel_1_upd_info) \
824 SymI_HasProto(stg_sel_2_upd_info) \
825 SymI_HasProto(stg_sel_3_upd_info) \
826 SymI_HasProto(stg_sel_4_upd_info) \
827 SymI_HasProto(stg_sel_5_upd_info) \
828 SymI_HasProto(stg_sel_6_upd_info) \
829 SymI_HasProto(stg_sel_7_upd_info) \
830 SymI_HasProto(stg_sel_8_upd_info) \
831 SymI_HasProto(stg_sel_9_upd_info) \
832 SymI_HasProto(stg_upd_frame_info) \
833 SymI_HasProto(suspendThread) \
834 SymI_HasProto(takeMVarzh_fast) \
835 SymI_HasProto(threadStatuszh_fast) \
836 SymI_HasProto(timesIntegerzh_fast) \
837 SymI_HasProto(tryPutMVarzh_fast) \
838 SymI_HasProto(tryTakeMVarzh_fast) \
839 SymI_HasProto(unblockAsyncExceptionszh_fast) \
840 SymI_HasProto(unloadObj) \
841 SymI_HasProto(unsafeThawArrayzh_fast) \
842 SymI_HasProto(waitReadzh_fast) \
843 SymI_HasProto(waitWritezh_fast) \
844 SymI_HasProto(word2Integerzh_fast) \
845 SymI_HasProto(writeTVarzh_fast) \
846 SymI_HasProto(xorIntegerzh_fast) \
847 SymI_HasProto(yieldzh_fast) \
848 SymI_NeedsProto(stg_interp_constr_entry) \
849 SymI_HasProto(allocateExec) \
850 SymI_HasProto(freeExec) \
851 SymI_HasProto(getAllocations) \
852 SymI_HasProto(revertCAFs) \
853 SymI_HasProto(RtsFlags) \
854 SymI_NeedsProto(rts_breakpoint_io_action) \
855 SymI_NeedsProto(rts_stop_next_breakpoint) \
856 SymI_NeedsProto(rts_stop_on_exception) \
857 SymI_HasProto(stopTimer) \
858 SymI_HasProto(n_capabilities) \
859 SymI_HasProto(traceCcszh_fast) \
860 RTS_USER_SIGNALS_SYMBOLS
862 #ifdef SUPPORT_LONG_LONGS
863 #define RTS_LONG_LONG_SYMS \
864 SymI_HasProto(int64ToIntegerzh_fast) \
865 SymI_HasProto(word64ToIntegerzh_fast)
867 #define RTS_LONG_LONG_SYMS /* nothing */
870 // 64-bit support functions in libgcc.a
871 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
872 #define RTS_LIBGCC_SYMBOLS \
873 SymI_NeedsProto(__divdi3) \
874 SymI_NeedsProto(__udivdi3) \
875 SymI_NeedsProto(__moddi3) \
876 SymI_NeedsProto(__umoddi3) \
877 SymI_NeedsProto(__muldi3) \
878 SymI_NeedsProto(__ashldi3) \
879 SymI_NeedsProto(__ashrdi3) \
880 SymI_NeedsProto(__lshrdi3) \
881 SymI_NeedsProto(__eprintf)
882 #elif defined(ia64_HOST_ARCH)
883 #define RTS_LIBGCC_SYMBOLS \
884 SymI_NeedsProto(__divdi3) \
885 SymI_NeedsProto(__udivdi3) \
886 SymI_NeedsProto(__moddi3) \
887 SymI_NeedsProto(__umoddi3) \
888 SymI_NeedsProto(__divsf3) \
889 SymI_NeedsProto(__divdf3)
891 #define RTS_LIBGCC_SYMBOLS
894 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
895 // Symbols that don't have a leading underscore
896 // on Mac OS X. They have to receive special treatment,
897 // see machoInitSymbolsWithoutUnderscore()
898 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
899 SymI_NeedsProto(saveFP) \
900 SymI_NeedsProto(restFP)
903 /* entirely bogus claims about types of these symbols */
904 #define SymI_NeedsProto(vvv) extern void vvv(void);
905 #if defined(__PIC__) && defined(mingw32_TARGET_OS)
906 #define SymE_HasProto(vvv) SymE_HasProto(vvv);
907 #define SymE_NeedsProto(vvv) extern void _imp__ ## vvv (void);
909 #define SymE_NeedsProto(vvv) SymI_NeedsProto(vvv);
910 #define SymE_HasProto(vvv) SymI_HasProto(vvv)
912 #define SymI_HasProto(vvv) /**/
913 #define SymI_HasProto_redirect(vvv,xxx) /**/
917 RTS_POSIX_ONLY_SYMBOLS
918 RTS_MINGW_ONLY_SYMBOLS
919 RTS_CYGWIN_ONLY_SYMBOLS
920 RTS_DARWIN_ONLY_SYMBOLS
923 #undef SymI_NeedsProto
925 #undef SymI_HasProto_redirect
927 #undef SymE_NeedsProto
929 #ifdef LEADING_UNDERSCORE
930 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
932 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
935 #define SymI_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
937 #define SymE_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
938 (void*)DLL_IMPORT_DATA_REF(vvv) },
940 #define SymI_NeedsProto(vvv) SymI_HasProto(vvv)
941 #define SymE_NeedsProto(vvv) SymE_HasProto(vvv)
943 // SymI_HasProto_redirect allows us to redirect references to one symbol to
944 // another symbol. See newCAF/newDynCAF for an example.
945 #define SymI_HasProto_redirect(vvv,xxx) \
946 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
949 static RtsSymbolVal rtsSyms[] = {
953 RTS_POSIX_ONLY_SYMBOLS
954 RTS_MINGW_ONLY_SYMBOLS
955 RTS_CYGWIN_ONLY_SYMBOLS
956 RTS_DARWIN_ONLY_SYMBOLS
959 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
960 // dyld stub code contains references to this,
961 // but it should never be called because we treat
962 // lazy pointers as nonlazy.
963 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
965 { 0, 0 } /* sentinel */
970 /* -----------------------------------------------------------------------------
971 * Insert symbols into hash tables, checking for duplicates.
974 static void ghciInsertStrHashTable ( char* obj_name,
980 if (lookupHashTable(table, (StgWord)key) == NULL)
982 insertStrHashTable(table, (StgWord)key, data);
987 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
989 "whilst processing object file\n"
991 "This could be caused by:\n"
992 " * Loading two different object files which export the same symbol\n"
993 " * Specifying the same object file twice on the GHCi command line\n"
994 " * An incorrect `package.conf' entry, causing some object to be\n"
996 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
1003 /* -----------------------------------------------------------------------------
1004 * initialize the object linker
1008 static int linker_init_done = 0 ;
1010 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1011 static void *dl_prog_handle;
1019 /* Make initLinker idempotent, so we can call it
1020 before evey relevant operation; that means we
1021 don't need to initialise the linker separately */
1022 if (linker_init_done == 1) { return; } else {
1023 linker_init_done = 1;
1026 stablehash = allocStrHashTable();
1027 symhash = allocStrHashTable();
1029 /* populate the symbol table with stuff from the RTS */
1030 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
1031 ghciInsertStrHashTable("(GHCi built-in symbols)",
1032 symhash, sym->lbl, sym->addr);
1034 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1035 machoInitSymbolsWithoutUnderscore();
1038 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1039 # if defined(RTLD_DEFAULT)
1040 dl_prog_handle = RTLD_DEFAULT;
1042 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
1043 # endif /* RTLD_DEFAULT */
1046 #if defined(x86_64_HOST_ARCH)
1047 if (RtsFlags.MiscFlags.linkerMemBase != 0) {
1048 // User-override for mmap_32bit_base
1049 mmap_32bit_base = (void*)RtsFlags.MiscFlags.linkerMemBase;
1054 /* -----------------------------------------------------------------------------
1055 * Loading DLL or .so dynamic libraries
1056 * -----------------------------------------------------------------------------
1058 * Add a DLL from which symbols may be found. In the ELF case, just
1059 * do RTLD_GLOBAL-style add, so no further messing around needs to
1060 * happen in order that symbols in the loaded .so are findable --
1061 * lookupSymbol() will subsequently see them by dlsym on the program's
1062 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
1064 * In the PEi386 case, open the DLLs and put handles to them in a
1065 * linked list. When looking for a symbol, try all handles in the
1066 * list. This means that we need to load even DLLs that are guaranteed
1067 * to be in the ghc.exe image already, just so we can get a handle
1068 * to give to loadSymbol, so that we can find the symbols. For such
1069 * libraries, the LoadLibrary call should be a no-op except for returning
1074 #if defined(OBJFORMAT_PEi386)
1075 /* A record for storing handles into DLLs. */
1080 struct _OpenedDLL* next;
1085 /* A list thereof. */
1086 static OpenedDLL* opened_dlls = NULL;
1090 addDLL( char *dll_name )
1092 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1093 /* ------------------- ELF DLL loader ------------------- */
1099 // omitted: RTLD_NOW
1100 // see http://www.haskell.org/pipermail/cvs-ghc/2007-September/038570.html
1101 hdl= dlopen(dll_name, RTLD_LAZY | RTLD_GLOBAL);
1104 /* dlopen failed; return a ptr to the error msg. */
1106 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1113 # elif defined(OBJFORMAT_PEi386)
1114 /* ------------------- Win32 DLL loader ------------------- */
1122 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1124 /* See if we've already got it, and ignore if so. */
1125 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1126 if (0 == strcmp(o_dll->name, dll_name))
1130 /* The file name has no suffix (yet) so that we can try
1131 both foo.dll and foo.drv
1133 The documentation for LoadLibrary says:
1134 If no file name extension is specified in the lpFileName
1135 parameter, the default library extension .dll is
1136 appended. However, the file name string can include a trailing
1137 point character (.) to indicate that the module name has no
1140 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1141 sprintf(buf, "%s.DLL", dll_name);
1142 instance = LoadLibrary(buf);
1143 if (instance == NULL) {
1144 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1145 // KAA: allow loading of drivers (like winspool.drv)
1146 sprintf(buf, "%s.DRV", dll_name);
1147 instance = LoadLibrary(buf);
1148 if (instance == NULL) {
1149 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1150 // #1883: allow loading of unix-style libfoo.dll DLLs
1151 sprintf(buf, "lib%s.DLL", dll_name);
1152 instance = LoadLibrary(buf);
1153 if (instance == NULL) {
1160 /* Add this DLL to the list of DLLs in which to search for symbols. */
1161 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1162 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1163 strcpy(o_dll->name, dll_name);
1164 o_dll->instance = instance;
1165 o_dll->next = opened_dlls;
1166 opened_dlls = o_dll;
1172 sysErrorBelch(dll_name);
1174 /* LoadLibrary failed; return a ptr to the error msg. */
1175 return "addDLL: could not load DLL";
1178 barf("addDLL: not implemented on this platform");
1182 /* -----------------------------------------------------------------------------
1183 * insert a stable symbol in the hash table
1187 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1189 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1193 /* -----------------------------------------------------------------------------
1194 * insert a symbol in the hash table
1197 insertSymbol(char* obj_name, char* key, void* data)
1199 ghciInsertStrHashTable(obj_name, symhash, key, data);
1202 /* -----------------------------------------------------------------------------
1203 * lookup a symbol in the hash table
1206 lookupSymbol( char *lbl )
1210 ASSERT(symhash != NULL);
1211 val = lookupStrHashTable(symhash, lbl);
1214 # if defined(OBJFORMAT_ELF)
1215 return dlsym(dl_prog_handle, lbl);
1216 # elif defined(OBJFORMAT_MACHO)
1218 /* On OS X 10.3 and later, we use dlsym instead of the old legacy
1221 HACK: On OS X, global symbols are prefixed with an underscore.
1222 However, dlsym wants us to omit the leading underscore from the
1223 symbol name. For now, we simply strip it off here (and ONLY
1226 ASSERT(lbl[0] == '_');
1227 return dlsym(dl_prog_handle, lbl+1);
1229 if(NSIsSymbolNameDefined(lbl)) {
1230 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1231 return NSAddressOfSymbol(symbol);
1235 # endif /* HAVE_DLFCN_H */
1236 # elif defined(OBJFORMAT_PEi386)
1239 sym = lookupSymbolInDLLs(lbl);
1240 if (sym != NULL) { return sym; };
1242 // Also try looking up the symbol without the @N suffix. Some
1243 // DLLs have the suffixes on their symbols, some don't.
1244 zapTrailingAtSign ( lbl );
1245 sym = lookupSymbolInDLLs(lbl);
1246 if (sym != NULL) { return sym; };
1258 /* -----------------------------------------------------------------------------
1259 * Debugging aid: look in GHCi's object symbol tables for symbols
1260 * within DELTA bytes of the specified address, and show their names.
1263 void ghci_enquire ( char* addr );
1265 void ghci_enquire ( char* addr )
1270 const int DELTA = 64;
1275 for (oc = objects; oc; oc = oc->next) {
1276 for (i = 0; i < oc->n_symbols; i++) {
1277 sym = oc->symbols[i];
1278 if (sym == NULL) continue;
1281 a = lookupStrHashTable(symhash, sym);
1284 // debugBelch("ghci_enquire: can't find %s\n", sym);
1286 else if (addr-DELTA <= a && a <= addr+DELTA) {
1287 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1294 #ifdef ia64_HOST_ARCH
1295 static unsigned int PLTSize(void);
1299 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1302 mmapForLinker (size_t bytes, nat flags, int fd)
1304 void *map_addr = NULL;
1307 static nat fixed = 0;
1309 pagesize = getpagesize();
1310 size = ROUND_UP(bytes, pagesize);
1312 #if defined(x86_64_HOST_ARCH)
1315 if (mmap_32bit_base != 0) {
1316 map_addr = mmap_32bit_base;
1320 result = mmap(map_addr, size, PROT_EXEC|PROT_READ|PROT_WRITE,
1321 MAP_PRIVATE|TRY_MAP_32BIT|fixed|flags, fd, 0);
1323 if (result == MAP_FAILED) {
1324 sysErrorBelch("mmap %lu bytes at %p",(lnat)size,map_addr);
1325 errorBelch("Try specifying an address with +RTS -xm<addr> -RTS");
1326 stg_exit(EXIT_FAILURE);
1329 #if defined(x86_64_HOST_ARCH)
1330 if (mmap_32bit_base != 0) {
1331 if (result == map_addr) {
1332 mmap_32bit_base = map_addr + size;
1334 if ((W_)result > 0x80000000) {
1335 // oops, we were given memory over 2Gb
1336 #if defined(freebsd_HOST_OS)
1337 // Some platforms require MAP_FIXED. This is normally
1338 // a bad idea, because MAP_FIXED will overwrite
1339 // existing mappings.
1340 munmap(result,size);
1344 barf("loadObj: failed to mmap() memory below 2Gb; asked for %lu bytes at %p. Try specifying an address with +RTS -xm<addr> -RTS", size, map_addr, result);
1347 // hmm, we were given memory somewhere else, but it's
1348 // still under 2Gb so we can use it. Next time, ask
1349 // for memory right after the place we just got some
1350 mmap_32bit_base = (void*)result + size;
1354 if ((W_)result > 0x80000000) {
1355 // oops, we were given memory over 2Gb
1356 // ... try allocating memory somewhere else?;
1357 debugTrace(DEBUG_linker,"MAP_32BIT didn't work; gave us %lu bytes at 0x%p", bytes, result);
1358 munmap(result, size);
1360 // Set a base address and try again... (guess: 1Gb)
1361 mmap_32bit_base = (void*)0x40000000;
1371 /* -----------------------------------------------------------------------------
1372 * Load an obj (populate the global symbol table, but don't resolve yet)
1374 * Returns: 1 if ok, 0 on error.
1377 loadObj( char *path )
1389 /* debugBelch("loadObj %s\n", path ); */
1391 /* Check that we haven't already loaded this object.
1392 Ignore requests to load multiple times */
1396 for (o = objects; o; o = o->next) {
1397 if (0 == strcmp(o->fileName, path)) {
1399 break; /* don't need to search further */
1403 IF_DEBUG(linker, debugBelch(
1404 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1405 "same object file twice:\n"
1407 "GHCi will ignore this, but be warned.\n"
1409 return 1; /* success */
1413 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1415 # if defined(OBJFORMAT_ELF)
1416 oc->formatName = "ELF";
1417 # elif defined(OBJFORMAT_PEi386)
1418 oc->formatName = "PEi386";
1419 # elif defined(OBJFORMAT_MACHO)
1420 oc->formatName = "Mach-O";
1423 barf("loadObj: not implemented on this platform");
1426 r = stat(path, &st);
1427 if (r == -1) { return 0; }
1429 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1430 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1431 strcpy(oc->fileName, path);
1433 oc->fileSize = st.st_size;
1435 oc->sections = NULL;
1436 oc->proddables = NULL;
1438 /* chain it onto the list of objects */
1443 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1445 #if defined(openbsd_HOST_OS)
1446 fd = open(path, O_RDONLY, S_IRUSR);
1448 fd = open(path, O_RDONLY);
1451 barf("loadObj: can't open `%s'", path);
1453 #ifdef ia64_HOST_ARCH
1454 /* The PLT needs to be right before the object */
1457 pagesize = getpagesize();
1458 n = ROUND_UP(PLTSize(), pagesize);
1459 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1460 if (oc->plt == MAP_FAILED)
1461 barf("loadObj: can't allocate PLT");
1464 map_addr = oc->plt + n;
1466 n = ROUND_UP(oc->fileSize, pagesize);
1467 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1468 MAP_PRIVATE|TRY_MAP_32BIT, fd, 0);
1469 if (oc->image == MAP_FAILED)
1470 barf("loadObj: can't map `%s'", path);
1473 oc->image = mmapForLinker(oc->fileSize, 0, fd);
1478 #else /* !USE_MMAP */
1479 /* load the image into memory */
1480 f = fopen(path, "rb");
1482 barf("loadObj: can't read `%s'", path);
1484 # if defined(mingw32_HOST_OS)
1485 // TODO: We would like to use allocateExec here, but allocateExec
1486 // cannot currently allocate blocks large enough.
1487 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1488 PAGE_EXECUTE_READWRITE);
1489 # elif defined(darwin_HOST_OS)
1490 // In a Mach-O .o file, all sections can and will be misaligned
1491 // if the total size of the headers is not a multiple of the
1492 // desired alignment. This is fine for .o files that only serve
1493 // as input for the static linker, but it's not fine for us,
1494 // as SSE (used by gcc for floating point) and Altivec require
1495 // 16-byte alignment.
1496 // We calculate the correct alignment from the header before
1497 // reading the file, and then we misalign oc->image on purpose so
1498 // that the actual sections end up aligned again.
1499 oc->misalignment = machoGetMisalignment(f);
1500 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1501 oc->image += oc->misalignment;
1503 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1508 n = fread ( oc->image, 1, oc->fileSize, f );
1509 if (n != oc->fileSize)
1510 barf("loadObj: error whilst reading `%s'", path);
1513 #endif /* USE_MMAP */
1515 # if defined(OBJFORMAT_MACHO) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1516 r = ocAllocateSymbolExtras_MachO ( oc );
1517 if (!r) { return r; }
1518 # elif defined(OBJFORMAT_ELF) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1519 r = ocAllocateSymbolExtras_ELF ( oc );
1520 if (!r) { return r; }
1523 /* verify the in-memory image */
1524 # if defined(OBJFORMAT_ELF)
1525 r = ocVerifyImage_ELF ( oc );
1526 # elif defined(OBJFORMAT_PEi386)
1527 r = ocVerifyImage_PEi386 ( oc );
1528 # elif defined(OBJFORMAT_MACHO)
1529 r = ocVerifyImage_MachO ( oc );
1531 barf("loadObj: no verify method");
1533 if (!r) { return r; }
1535 /* build the symbol list for this image */
1536 # if defined(OBJFORMAT_ELF)
1537 r = ocGetNames_ELF ( oc );
1538 # elif defined(OBJFORMAT_PEi386)
1539 r = ocGetNames_PEi386 ( oc );
1540 # elif defined(OBJFORMAT_MACHO)
1541 r = ocGetNames_MachO ( oc );
1543 barf("loadObj: no getNames method");
1545 if (!r) { return r; }
1547 /* loaded, but not resolved yet */
1548 oc->status = OBJECT_LOADED;
1553 /* -----------------------------------------------------------------------------
1554 * resolve all the currently unlinked objects in memory
1556 * Returns: 1 if ok, 0 on error.
1566 for (oc = objects; oc; oc = oc->next) {
1567 if (oc->status != OBJECT_RESOLVED) {
1568 # if defined(OBJFORMAT_ELF)
1569 r = ocResolve_ELF ( oc );
1570 # elif defined(OBJFORMAT_PEi386)
1571 r = ocResolve_PEi386 ( oc );
1572 # elif defined(OBJFORMAT_MACHO)
1573 r = ocResolve_MachO ( oc );
1575 barf("resolveObjs: not implemented on this platform");
1577 if (!r) { return r; }
1578 oc->status = OBJECT_RESOLVED;
1584 /* -----------------------------------------------------------------------------
1585 * delete an object from the pool
1588 unloadObj( char *path )
1590 ObjectCode *oc, *prev;
1592 ASSERT(symhash != NULL);
1593 ASSERT(objects != NULL);
1598 for (oc = objects; oc; prev = oc, oc = oc->next) {
1599 if (!strcmp(oc->fileName,path)) {
1601 /* Remove all the mappings for the symbols within this
1606 for (i = 0; i < oc->n_symbols; i++) {
1607 if (oc->symbols[i] != NULL) {
1608 removeStrHashTable(symhash, oc->symbols[i], NULL);
1616 prev->next = oc->next;
1619 // We're going to leave this in place, in case there are
1620 // any pointers from the heap into it:
1621 // #ifdef mingw32_HOST_OS
1622 // VirtualFree(oc->image);
1624 // stgFree(oc->image);
1626 stgFree(oc->fileName);
1627 stgFree(oc->symbols);
1628 stgFree(oc->sections);
1634 errorBelch("unloadObj: can't find `%s' to unload", path);
1638 /* -----------------------------------------------------------------------------
1639 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1640 * which may be prodded during relocation, and abort if we try and write
1641 * outside any of these.
1643 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1646 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1647 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1651 pb->next = oc->proddables;
1652 oc->proddables = pb;
1655 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1658 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1659 char* s = (char*)(pb->start);
1660 char* e = s + pb->size - 1;
1661 char* a = (char*)addr;
1662 /* Assumes that the biggest fixup involves a 4-byte write. This
1663 probably needs to be changed to 8 (ie, +7) on 64-bit
1665 if (a >= s && (a+3) <= e) return;
1667 barf("checkProddableBlock: invalid fixup in runtime linker");
1670 /* -----------------------------------------------------------------------------
1671 * Section management.
1673 static void addSection ( ObjectCode* oc, SectionKind kind,
1674 void* start, void* end )
1676 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1680 s->next = oc->sections;
1683 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1684 start, ((char*)end)-1, end - start + 1, kind );
1689 /* --------------------------------------------------------------------------
1691 * This is about allocating a small chunk of memory for every symbol in the
1692 * object file. We make sure that the SymboLExtras are always "in range" of
1693 * limited-range PC-relative instructions on various platforms by allocating
1694 * them right next to the object code itself.
1697 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
1700 ocAllocateSymbolExtras
1702 Allocate additional space at the end of the object file image to make room
1703 for jump islands (powerpc, x86_64) and GOT entries (x86_64).
1705 PowerPC relative branch instructions have a 24 bit displacement field.
1706 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1707 If a particular imported symbol is outside this range, we have to redirect
1708 the jump to a short piece of new code that just loads the 32bit absolute
1709 address and jumps there.
1710 On x86_64, PC-relative jumps and PC-relative accesses to the GOT are limited
1713 This function just allocates space for one SymbolExtra for every
1714 undefined symbol in the object file. The code for the jump islands is
1715 filled in by makeSymbolExtra below.
1718 static int ocAllocateSymbolExtras( ObjectCode* oc, int count, int first )
1725 int misalignment = 0;
1726 #ifdef darwin_HOST_OS
1727 misalignment = oc->misalignment;
1733 // round up to the nearest 4
1734 aligned = (oc->fileSize + 3) & ~3;
1737 pagesize = getpagesize();
1738 n = ROUND_UP( oc->fileSize, pagesize );
1739 m = ROUND_UP( aligned + sizeof (SymbolExtra) * count, pagesize );
1741 /* we try to use spare space at the end of the last page of the
1742 * image for the jump islands, but if there isn't enough space
1743 * then we have to map some (anonymously, remembering MAP_32BIT).
1745 if( m > n ) // we need to allocate more pages
1747 oc->symbol_extras = mmapForLinker(sizeof(SymbolExtra) * count,
1752 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1755 oc->image -= misalignment;
1756 oc->image = stgReallocBytes( oc->image,
1758 aligned + sizeof (SymbolExtra) * count,
1759 "ocAllocateSymbolExtras" );
1760 oc->image += misalignment;
1762 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1763 #endif /* USE_MMAP */
1765 memset( oc->symbol_extras, 0, sizeof (SymbolExtra) * count );
1768 oc->symbol_extras = NULL;
1770 oc->first_symbol_extra = first;
1771 oc->n_symbol_extras = count;
1776 static SymbolExtra* makeSymbolExtra( ObjectCode* oc,
1777 unsigned long symbolNumber,
1778 unsigned long target )
1782 ASSERT( symbolNumber >= oc->first_symbol_extra
1783 && symbolNumber - oc->first_symbol_extra < oc->n_symbol_extras);
1785 extra = &oc->symbol_extras[symbolNumber - oc->first_symbol_extra];
1787 #ifdef powerpc_HOST_ARCH
1788 // lis r12, hi16(target)
1789 extra->jumpIsland.lis_r12 = 0x3d80;
1790 extra->jumpIsland.hi_addr = target >> 16;
1792 // ori r12, r12, lo16(target)
1793 extra->jumpIsland.ori_r12_r12 = 0x618c;
1794 extra->jumpIsland.lo_addr = target & 0xffff;
1797 extra->jumpIsland.mtctr_r12 = 0x7d8903a6;
1800 extra->jumpIsland.bctr = 0x4e800420;
1802 #ifdef x86_64_HOST_ARCH
1804 static uint8_t jmp[] = { 0xFF, 0x25, 0xF2, 0xFF, 0xFF, 0xFF };
1805 extra->addr = target;
1806 memcpy(extra->jumpIsland, jmp, 6);
1814 /* --------------------------------------------------------------------------
1815 * PowerPC specifics (instruction cache flushing)
1816 * ------------------------------------------------------------------------*/
1818 #ifdef powerpc_TARGET_ARCH
1820 ocFlushInstructionCache
1822 Flush the data & instruction caches.
1823 Because the PPC has split data/instruction caches, we have to
1824 do that whenever we modify code at runtime.
1827 static void ocFlushInstructionCache( ObjectCode *oc )
1829 int n = (oc->fileSize + sizeof( SymbolExtra ) * oc->n_symbol_extras + 3) / 4;
1830 unsigned long *p = (unsigned long *) oc->image;
1834 __asm__ volatile ( "dcbf 0,%0\n\t"
1842 __asm__ volatile ( "sync\n\t"
1848 /* --------------------------------------------------------------------------
1849 * PEi386 specifics (Win32 targets)
1850 * ------------------------------------------------------------------------*/
1852 /* The information for this linker comes from
1853 Microsoft Portable Executable
1854 and Common Object File Format Specification
1855 revision 5.1 January 1998
1856 which SimonM says comes from the MS Developer Network CDs.
1858 It can be found there (on older CDs), but can also be found
1861 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1863 (this is Rev 6.0 from February 1999).
1865 Things move, so if that fails, try searching for it via
1867 http://www.google.com/search?q=PE+COFF+specification
1869 The ultimate reference for the PE format is the Winnt.h
1870 header file that comes with the Platform SDKs; as always,
1871 implementations will drift wrt their documentation.
1873 A good background article on the PE format is Matt Pietrek's
1874 March 1994 article in Microsoft System Journal (MSJ)
1875 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1876 Win32 Portable Executable File Format." The info in there
1877 has recently been updated in a two part article in
1878 MSDN magazine, issues Feb and March 2002,
1879 "Inside Windows: An In-Depth Look into the Win32 Portable
1880 Executable File Format"
1882 John Levine's book "Linkers and Loaders" contains useful
1887 #if defined(OBJFORMAT_PEi386)
1891 typedef unsigned char UChar;
1892 typedef unsigned short UInt16;
1893 typedef unsigned int UInt32;
1900 UInt16 NumberOfSections;
1901 UInt32 TimeDateStamp;
1902 UInt32 PointerToSymbolTable;
1903 UInt32 NumberOfSymbols;
1904 UInt16 SizeOfOptionalHeader;
1905 UInt16 Characteristics;
1909 #define sizeof_COFF_header 20
1916 UInt32 VirtualAddress;
1917 UInt32 SizeOfRawData;
1918 UInt32 PointerToRawData;
1919 UInt32 PointerToRelocations;
1920 UInt32 PointerToLinenumbers;
1921 UInt16 NumberOfRelocations;
1922 UInt16 NumberOfLineNumbers;
1923 UInt32 Characteristics;
1927 #define sizeof_COFF_section 40
1934 UInt16 SectionNumber;
1937 UChar NumberOfAuxSymbols;
1941 #define sizeof_COFF_symbol 18
1946 UInt32 VirtualAddress;
1947 UInt32 SymbolTableIndex;
1952 #define sizeof_COFF_reloc 10
1955 /* From PE spec doc, section 3.3.2 */
1956 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1957 windows.h -- for the same purpose, but I want to know what I'm
1959 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1960 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1961 #define MYIMAGE_FILE_DLL 0x2000
1962 #define MYIMAGE_FILE_SYSTEM 0x1000
1963 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1964 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1965 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1967 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1968 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1969 #define MYIMAGE_SYM_CLASS_STATIC 3
1970 #define MYIMAGE_SYM_UNDEFINED 0
1972 /* From PE spec doc, section 4.1 */
1973 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1974 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1975 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1977 /* From PE spec doc, section 5.2.1 */
1978 #define MYIMAGE_REL_I386_DIR32 0x0006
1979 #define MYIMAGE_REL_I386_REL32 0x0014
1982 /* We use myindex to calculate array addresses, rather than
1983 simply doing the normal subscript thing. That's because
1984 some of the above structs have sizes which are not
1985 a whole number of words. GCC rounds their sizes up to a
1986 whole number of words, which means that the address calcs
1987 arising from using normal C indexing or pointer arithmetic
1988 are just plain wrong. Sigh.
1991 myindex ( int scale, void* base, int index )
1994 ((UChar*)base) + scale * index;
1999 printName ( UChar* name, UChar* strtab )
2001 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2002 UInt32 strtab_offset = * (UInt32*)(name+4);
2003 debugBelch("%s", strtab + strtab_offset );
2006 for (i = 0; i < 8; i++) {
2007 if (name[i] == 0) break;
2008 debugBelch("%c", name[i] );
2015 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
2017 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2018 UInt32 strtab_offset = * (UInt32*)(name+4);
2019 strncpy ( dst, strtab+strtab_offset, dstSize );
2025 if (name[i] == 0) break;
2035 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
2038 /* If the string is longer than 8 bytes, look in the
2039 string table for it -- this will be correctly zero terminated.
2041 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2042 UInt32 strtab_offset = * (UInt32*)(name+4);
2043 return ((UChar*)strtab) + strtab_offset;
2045 /* Otherwise, if shorter than 8 bytes, return the original,
2046 which by defn is correctly terminated.
2048 if (name[7]==0) return name;
2049 /* The annoying case: 8 bytes. Copy into a temporary
2050 (which is never freed ...)
2052 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
2054 strncpy(newstr,name,8);
2060 /* Just compares the short names (first 8 chars) */
2061 static COFF_section *
2062 findPEi386SectionCalled ( ObjectCode* oc, char* name )
2066 = (COFF_header*)(oc->image);
2067 COFF_section* sectab
2069 ((UChar*)(oc->image))
2070 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2072 for (i = 0; i < hdr->NumberOfSections; i++) {
2075 COFF_section* section_i
2077 myindex ( sizeof_COFF_section, sectab, i );
2078 n1 = (UChar*) &(section_i->Name);
2080 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
2081 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
2082 n1[6]==n2[6] && n1[7]==n2[7])
2091 zapTrailingAtSign ( UChar* sym )
2093 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
2095 if (sym[0] == 0) return;
2097 while (sym[i] != 0) i++;
2100 while (j > 0 && my_isdigit(sym[j])) j--;
2101 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
2106 lookupSymbolInDLLs ( UChar *lbl )
2111 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
2112 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
2114 if (lbl[0] == '_') {
2115 /* HACK: if the name has an initial underscore, try stripping
2116 it off & look that up first. I've yet to verify whether there's
2117 a Rule that governs whether an initial '_' *should always* be
2118 stripped off when mapping from import lib name to the DLL name.
2120 sym = GetProcAddress(o_dll->instance, (lbl+1));
2122 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
2126 sym = GetProcAddress(o_dll->instance, lbl);
2128 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
2137 ocVerifyImage_PEi386 ( ObjectCode* oc )
2142 COFF_section* sectab;
2143 COFF_symbol* symtab;
2145 /* debugBelch("\nLOADING %s\n", oc->fileName); */
2146 hdr = (COFF_header*)(oc->image);
2147 sectab = (COFF_section*) (
2148 ((UChar*)(oc->image))
2149 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2151 symtab = (COFF_symbol*) (
2152 ((UChar*)(oc->image))
2153 + hdr->PointerToSymbolTable
2155 strtab = ((UChar*)symtab)
2156 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2158 if (hdr->Machine != 0x14c) {
2159 errorBelch("%s: Not x86 PEi386", oc->fileName);
2162 if (hdr->SizeOfOptionalHeader != 0) {
2163 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2166 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2167 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2168 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2169 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2170 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2173 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2174 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2175 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2177 (int)(hdr->Characteristics));
2180 /* If the string table size is way crazy, this might indicate that
2181 there are more than 64k relocations, despite claims to the
2182 contrary. Hence this test. */
2183 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2185 if ( (*(UInt32*)strtab) > 600000 ) {
2186 /* Note that 600k has no special significance other than being
2187 big enough to handle the almost-2MB-sized lumps that
2188 constitute HSwin32*.o. */
2189 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2194 /* No further verification after this point; only debug printing. */
2196 IF_DEBUG(linker, i=1);
2197 if (i == 0) return 1;
2199 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2200 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2201 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2204 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2205 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2206 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2207 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2208 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2209 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2210 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2212 /* Print the section table. */
2214 for (i = 0; i < hdr->NumberOfSections; i++) {
2216 COFF_section* sectab_i
2218 myindex ( sizeof_COFF_section, sectab, i );
2225 printName ( sectab_i->Name, strtab );
2235 sectab_i->VirtualSize,
2236 sectab_i->VirtualAddress,
2237 sectab_i->SizeOfRawData,
2238 sectab_i->PointerToRawData,
2239 sectab_i->NumberOfRelocations,
2240 sectab_i->PointerToRelocations,
2241 sectab_i->PointerToRawData
2243 reltab = (COFF_reloc*) (
2244 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2247 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2248 /* If the relocation field (a short) has overflowed, the
2249 * real count can be found in the first reloc entry.
2251 * See Section 4.1 (last para) of the PE spec (rev6.0).
2253 COFF_reloc* rel = (COFF_reloc*)
2254 myindex ( sizeof_COFF_reloc, reltab, 0 );
2255 noRelocs = rel->VirtualAddress;
2258 noRelocs = sectab_i->NumberOfRelocations;
2262 for (; j < noRelocs; j++) {
2264 COFF_reloc* rel = (COFF_reloc*)
2265 myindex ( sizeof_COFF_reloc, reltab, j );
2267 " type 0x%-4x vaddr 0x%-8x name `",
2269 rel->VirtualAddress );
2270 sym = (COFF_symbol*)
2271 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2272 /* Hmm..mysterious looking offset - what's it for? SOF */
2273 printName ( sym->Name, strtab -10 );
2280 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2281 debugBelch("---START of string table---\n");
2282 for (i = 4; i < *(Int32*)strtab; i++) {
2284 debugBelch("\n"); else
2285 debugBelch("%c", strtab[i] );
2287 debugBelch("--- END of string table---\n");
2292 COFF_symbol* symtab_i;
2293 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2294 symtab_i = (COFF_symbol*)
2295 myindex ( sizeof_COFF_symbol, symtab, i );
2301 printName ( symtab_i->Name, strtab );
2310 (Int32)(symtab_i->SectionNumber),
2311 (UInt32)symtab_i->Type,
2312 (UInt32)symtab_i->StorageClass,
2313 (UInt32)symtab_i->NumberOfAuxSymbols
2315 i += symtab_i->NumberOfAuxSymbols;
2325 ocGetNames_PEi386 ( ObjectCode* oc )
2328 COFF_section* sectab;
2329 COFF_symbol* symtab;
2336 hdr = (COFF_header*)(oc->image);
2337 sectab = (COFF_section*) (
2338 ((UChar*)(oc->image))
2339 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2341 symtab = (COFF_symbol*) (
2342 ((UChar*)(oc->image))
2343 + hdr->PointerToSymbolTable
2345 strtab = ((UChar*)(oc->image))
2346 + hdr->PointerToSymbolTable
2347 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2349 /* Allocate space for any (local, anonymous) .bss sections. */
2351 for (i = 0; i < hdr->NumberOfSections; i++) {
2354 COFF_section* sectab_i
2356 myindex ( sizeof_COFF_section, sectab, i );
2357 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2358 /* sof 10/05: the PE spec text isn't too clear regarding what
2359 * the SizeOfRawData field is supposed to hold for object
2360 * file sections containing just uninitialized data -- for executables,
2361 * it is supposed to be zero; unclear what it's supposed to be
2362 * for object files. However, VirtualSize is guaranteed to be
2363 * zero for object files, which definitely suggests that SizeOfRawData
2364 * will be non-zero (where else would the size of this .bss section be
2365 * stored?) Looking at the COFF_section info for incoming object files,
2366 * this certainly appears to be the case.
2368 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2369 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2370 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2371 * variable decls into to the .bss section. (The specific function in Q which
2372 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2374 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2375 /* This is a non-empty .bss section. Allocate zeroed space for
2376 it, and set its PointerToRawData field such that oc->image +
2377 PointerToRawData == addr_of_zeroed_space. */
2378 bss_sz = sectab_i->VirtualSize;
2379 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2380 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2381 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2382 addProddableBlock(oc, zspace, bss_sz);
2383 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2386 /* Copy section information into the ObjectCode. */
2388 for (i = 0; i < hdr->NumberOfSections; i++) {
2394 = SECTIONKIND_OTHER;
2395 COFF_section* sectab_i
2397 myindex ( sizeof_COFF_section, sectab, i );
2398 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2401 /* I'm sure this is the Right Way to do it. However, the
2402 alternative of testing the sectab_i->Name field seems to
2403 work ok with Cygwin.
2405 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2406 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2407 kind = SECTIONKIND_CODE_OR_RODATA;
2410 if (0==strcmp(".text",sectab_i->Name) ||
2411 0==strcmp(".rdata",sectab_i->Name)||
2412 0==strcmp(".rodata",sectab_i->Name))
2413 kind = SECTIONKIND_CODE_OR_RODATA;
2414 if (0==strcmp(".data",sectab_i->Name) ||
2415 0==strcmp(".bss",sectab_i->Name))
2416 kind = SECTIONKIND_RWDATA;
2418 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2419 sz = sectab_i->SizeOfRawData;
2420 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2422 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2423 end = start + sz - 1;
2425 if (kind == SECTIONKIND_OTHER
2426 /* Ignore sections called which contain stabs debugging
2428 && 0 != strcmp(".stab", sectab_i->Name)
2429 && 0 != strcmp(".stabstr", sectab_i->Name)
2430 /* ignore constructor section for now */
2431 && 0 != strcmp(".ctors", sectab_i->Name)
2432 /* ignore section generated from .ident */
2433 && 0!= strcmp("/4", sectab_i->Name)
2434 /* ignore unknown section that appeared in gcc 3.4.5(?) */
2435 && 0!= strcmp(".reloc", sectab_i->Name)
2437 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2441 if (kind != SECTIONKIND_OTHER && end >= start) {
2442 addSection(oc, kind, start, end);
2443 addProddableBlock(oc, start, end - start + 1);
2447 /* Copy exported symbols into the ObjectCode. */
2449 oc->n_symbols = hdr->NumberOfSymbols;
2450 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2451 "ocGetNames_PEi386(oc->symbols)");
2452 /* Call me paranoid; I don't care. */
2453 for (i = 0; i < oc->n_symbols; i++)
2454 oc->symbols[i] = NULL;
2458 COFF_symbol* symtab_i;
2459 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2460 symtab_i = (COFF_symbol*)
2461 myindex ( sizeof_COFF_symbol, symtab, i );
2465 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2466 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2467 /* This symbol is global and defined, viz, exported */
2468 /* for MYIMAGE_SYMCLASS_EXTERNAL
2469 && !MYIMAGE_SYM_UNDEFINED,
2470 the address of the symbol is:
2471 address of relevant section + offset in section
2473 COFF_section* sectabent
2474 = (COFF_section*) myindex ( sizeof_COFF_section,
2476 symtab_i->SectionNumber-1 );
2477 addr = ((UChar*)(oc->image))
2478 + (sectabent->PointerToRawData
2482 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2483 && symtab_i->Value > 0) {
2484 /* This symbol isn't in any section at all, ie, global bss.
2485 Allocate zeroed space for it. */
2486 addr = stgCallocBytes(1, symtab_i->Value,
2487 "ocGetNames_PEi386(non-anonymous bss)");
2488 addSection(oc, SECTIONKIND_RWDATA, addr,
2489 ((UChar*)addr) + symtab_i->Value - 1);
2490 addProddableBlock(oc, addr, symtab_i->Value);
2491 /* debugBelch("BSS section at 0x%x\n", addr); */
2494 if (addr != NULL ) {
2495 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2496 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2497 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2498 ASSERT(i >= 0 && i < oc->n_symbols);
2499 /* cstring_from_COFF_symbol_name always succeeds. */
2500 oc->symbols[i] = sname;
2501 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2505 "IGNORING symbol %d\n"
2509 printName ( symtab_i->Name, strtab );
2518 (Int32)(symtab_i->SectionNumber),
2519 (UInt32)symtab_i->Type,
2520 (UInt32)symtab_i->StorageClass,
2521 (UInt32)symtab_i->NumberOfAuxSymbols
2526 i += symtab_i->NumberOfAuxSymbols;
2535 ocResolve_PEi386 ( ObjectCode* oc )
2538 COFF_section* sectab;
2539 COFF_symbol* symtab;
2549 /* ToDo: should be variable-sized? But is at least safe in the
2550 sense of buffer-overrun-proof. */
2552 /* debugBelch("resolving for %s\n", oc->fileName); */
2554 hdr = (COFF_header*)(oc->image);
2555 sectab = (COFF_section*) (
2556 ((UChar*)(oc->image))
2557 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2559 symtab = (COFF_symbol*) (
2560 ((UChar*)(oc->image))
2561 + hdr->PointerToSymbolTable
2563 strtab = ((UChar*)(oc->image))
2564 + hdr->PointerToSymbolTable
2565 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2567 for (i = 0; i < hdr->NumberOfSections; i++) {
2568 COFF_section* sectab_i
2570 myindex ( sizeof_COFF_section, sectab, i );
2573 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2576 /* Ignore sections called which contain stabs debugging
2578 if (0 == strcmp(".stab", sectab_i->Name)
2579 || 0 == strcmp(".stabstr", sectab_i->Name)
2580 || 0 == strcmp(".ctors", sectab_i->Name))
2583 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2584 /* If the relocation field (a short) has overflowed, the
2585 * real count can be found in the first reloc entry.
2587 * See Section 4.1 (last para) of the PE spec (rev6.0).
2589 * Nov2003 update: the GNU linker still doesn't correctly
2590 * handle the generation of relocatable object files with
2591 * overflown relocations. Hence the output to warn of potential
2594 COFF_reloc* rel = (COFF_reloc*)
2595 myindex ( sizeof_COFF_reloc, reltab, 0 );
2596 noRelocs = rel->VirtualAddress;
2598 /* 10/05: we now assume (and check for) a GNU ld that is capable
2599 * of handling object files with (>2^16) of relocs.
2602 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2607 noRelocs = sectab_i->NumberOfRelocations;
2612 for (; j < noRelocs; j++) {
2614 COFF_reloc* reltab_j
2616 myindex ( sizeof_COFF_reloc, reltab, j );
2618 /* the location to patch */
2620 ((UChar*)(oc->image))
2621 + (sectab_i->PointerToRawData
2622 + reltab_j->VirtualAddress
2623 - sectab_i->VirtualAddress )
2625 /* the existing contents of pP */
2627 /* the symbol to connect to */
2628 sym = (COFF_symbol*)
2629 myindex ( sizeof_COFF_symbol,
2630 symtab, reltab_j->SymbolTableIndex );
2633 "reloc sec %2d num %3d: type 0x%-4x "
2634 "vaddr 0x%-8x name `",
2636 (UInt32)reltab_j->Type,
2637 reltab_j->VirtualAddress );
2638 printName ( sym->Name, strtab );
2639 debugBelch("'\n" ));
2641 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2642 COFF_section* section_sym
2643 = findPEi386SectionCalled ( oc, sym->Name );
2645 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2648 S = ((UInt32)(oc->image))
2649 + (section_sym->PointerToRawData
2652 copyName ( sym->Name, strtab, symbol, 1000-1 );
2653 S = (UInt32) lookupSymbol( symbol );
2654 if ((void*)S != NULL) goto foundit;
2655 /* Newline first because the interactive linker has printed "linking..." */
2656 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2660 checkProddableBlock(oc, pP);
2661 switch (reltab_j->Type) {
2662 case MYIMAGE_REL_I386_DIR32:
2665 case MYIMAGE_REL_I386_REL32:
2666 /* Tricky. We have to insert a displacement at
2667 pP which, when added to the PC for the _next_
2668 insn, gives the address of the target (S).
2669 Problem is to know the address of the next insn
2670 when we only know pP. We assume that this
2671 literal field is always the last in the insn,
2672 so that the address of the next insn is pP+4
2673 -- hence the constant 4.
2674 Also I don't know if A should be added, but so
2675 far it has always been zero.
2677 SOF 05/2005: 'A' (old contents of *pP) have been observed
2678 to contain values other than zero (the 'wx' object file
2679 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2680 So, add displacement to old value instead of asserting
2681 A to be zero. Fixes wxhaskell-related crashes, and no other
2682 ill effects have been observed.
2684 Update: the reason why we're seeing these more elaborate
2685 relocations is due to a switch in how the NCG compiles SRTs
2686 and offsets to them from info tables. SRTs live in .(ro)data,
2687 while info tables live in .text, causing GAS to emit REL32/DISP32
2688 relocations with non-zero values. Adding the displacement is
2689 the right thing to do.
2691 *pP = S - ((UInt32)pP) - 4 + A;
2694 debugBelch("%s: unhandled PEi386 relocation type %d",
2695 oc->fileName, reltab_j->Type);
2702 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2706 #endif /* defined(OBJFORMAT_PEi386) */
2709 /* --------------------------------------------------------------------------
2711 * ------------------------------------------------------------------------*/
2713 #if defined(OBJFORMAT_ELF)
2718 #if defined(sparc_HOST_ARCH)
2719 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2720 #elif defined(i386_HOST_ARCH)
2721 # define ELF_TARGET_386 /* Used inside <elf.h> */
2722 #elif defined(x86_64_HOST_ARCH)
2723 # define ELF_TARGET_X64_64
2725 #elif defined (ia64_HOST_ARCH)
2726 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2728 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2729 # define ELF_NEED_GOT /* needs Global Offset Table */
2730 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2733 #if !defined(openbsd_HOST_OS)
2736 /* openbsd elf has things in different places, with diff names */
2737 # include <elf_abi.h>
2738 # include <machine/reloc.h>
2739 # define R_386_32 RELOC_32
2740 # define R_386_PC32 RELOC_PC32
2743 /* If elf.h doesn't define it */
2744 # ifndef R_X86_64_PC64
2745 # define R_X86_64_PC64 24
2749 * Define a set of types which can be used for both ELF32 and ELF64
2753 #define ELFCLASS ELFCLASS64
2754 #define Elf_Addr Elf64_Addr
2755 #define Elf_Word Elf64_Word
2756 #define Elf_Sword Elf64_Sword
2757 #define Elf_Ehdr Elf64_Ehdr
2758 #define Elf_Phdr Elf64_Phdr
2759 #define Elf_Shdr Elf64_Shdr
2760 #define Elf_Sym Elf64_Sym
2761 #define Elf_Rel Elf64_Rel
2762 #define Elf_Rela Elf64_Rela
2763 #define ELF_ST_TYPE ELF64_ST_TYPE
2764 #define ELF_ST_BIND ELF64_ST_BIND
2765 #define ELF_R_TYPE ELF64_R_TYPE
2766 #define ELF_R_SYM ELF64_R_SYM
2768 #define ELFCLASS ELFCLASS32
2769 #define Elf_Addr Elf32_Addr
2770 #define Elf_Word Elf32_Word
2771 #define Elf_Sword Elf32_Sword
2772 #define Elf_Ehdr Elf32_Ehdr
2773 #define Elf_Phdr Elf32_Phdr
2774 #define Elf_Shdr Elf32_Shdr
2775 #define Elf_Sym Elf32_Sym
2776 #define Elf_Rel Elf32_Rel
2777 #define Elf_Rela Elf32_Rela
2779 #define ELF_ST_TYPE ELF32_ST_TYPE
2782 #define ELF_ST_BIND ELF32_ST_BIND
2785 #define ELF_R_TYPE ELF32_R_TYPE
2788 #define ELF_R_SYM ELF32_R_SYM
2794 * Functions to allocate entries in dynamic sections. Currently we simply
2795 * preallocate a large number, and we don't check if a entry for the given
2796 * target already exists (a linear search is too slow). Ideally these
2797 * entries would be associated with symbols.
2800 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2801 #define GOT_SIZE 0x20000
2802 #define FUNCTION_TABLE_SIZE 0x10000
2803 #define PLT_SIZE 0x08000
2806 static Elf_Addr got[GOT_SIZE];
2807 static unsigned int gotIndex;
2808 static Elf_Addr gp_val = (Elf_Addr)got;
2811 allocateGOTEntry(Elf_Addr target)
2815 if (gotIndex >= GOT_SIZE)
2816 barf("Global offset table overflow");
2818 entry = &got[gotIndex++];
2820 return (Elf_Addr)entry;
2824 #ifdef ELF_FUNCTION_DESC
2830 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2831 static unsigned int functionTableIndex;
2834 allocateFunctionDesc(Elf_Addr target)
2836 FunctionDesc *entry;
2838 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2839 barf("Function table overflow");
2841 entry = &functionTable[functionTableIndex++];
2843 entry->gp = (Elf_Addr)gp_val;
2844 return (Elf_Addr)entry;
2848 copyFunctionDesc(Elf_Addr target)
2850 FunctionDesc *olddesc = (FunctionDesc *)target;
2851 FunctionDesc *newdesc;
2853 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2854 newdesc->gp = olddesc->gp;
2855 return (Elf_Addr)newdesc;
2860 #ifdef ia64_HOST_ARCH
2861 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2862 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2864 static unsigned char plt_code[] =
2866 /* taken from binutils bfd/elfxx-ia64.c */
2867 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2868 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2869 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2870 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2871 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2872 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2875 /* If we can't get to the function descriptor via gp, take a local copy of it */
2876 #define PLT_RELOC(code, target) { \
2877 Elf64_Sxword rel_value = target - gp_val; \
2878 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2879 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2881 ia64_reloc_gprel22((Elf_Addr)code, target); \
2886 unsigned char code[sizeof(plt_code)];
2890 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2892 PLTEntry *plt = (PLTEntry *)oc->plt;
2895 if (oc->pltIndex >= PLT_SIZE)
2896 barf("Procedure table overflow");
2898 entry = &plt[oc->pltIndex++];
2899 memcpy(entry->code, plt_code, sizeof(entry->code));
2900 PLT_RELOC(entry->code, target);
2901 return (Elf_Addr)entry;
2907 return (PLT_SIZE * sizeof(PLTEntry));
2913 * Generic ELF functions
2917 findElfSection ( void* objImage, Elf_Word sh_type )
2919 char* ehdrC = (char*)objImage;
2920 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2921 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2922 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2926 for (i = 0; i < ehdr->e_shnum; i++) {
2927 if (shdr[i].sh_type == sh_type
2928 /* Ignore the section header's string table. */
2929 && i != ehdr->e_shstrndx
2930 /* Ignore string tables named .stabstr, as they contain
2932 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2934 ptr = ehdrC + shdr[i].sh_offset;
2941 #if defined(ia64_HOST_ARCH)
2943 findElfSegment ( void* objImage, Elf_Addr vaddr )
2945 char* ehdrC = (char*)objImage;
2946 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2947 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2948 Elf_Addr segaddr = 0;
2951 for (i = 0; i < ehdr->e_phnum; i++) {
2952 segaddr = phdr[i].p_vaddr;
2953 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2961 ocVerifyImage_ELF ( ObjectCode* oc )
2965 int i, j, nent, nstrtab, nsymtabs;
2969 char* ehdrC = (char*)(oc->image);
2970 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2972 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2973 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2974 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2975 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2976 errorBelch("%s: not an ELF object", oc->fileName);
2980 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2981 errorBelch("%s: unsupported ELF format", oc->fileName);
2985 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2986 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2988 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2989 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2991 errorBelch("%s: unknown endiannness", oc->fileName);
2995 if (ehdr->e_type != ET_REL) {
2996 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2999 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
3001 IF_DEBUG(linker,debugBelch( "Architecture is " ));
3002 switch (ehdr->e_machine) {
3003 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
3004 #ifdef EM_SPARC32PLUS
3005 case EM_SPARC32PLUS:
3007 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
3009 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
3011 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
3013 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
3014 #elif defined(EM_AMD64)
3015 case EM_AMD64: IF_DEBUG(linker,debugBelch( "amd64" )); break;
3017 default: IF_DEBUG(linker,debugBelch( "unknown" ));
3018 errorBelch("%s: unknown architecture (e_machine == %d)"
3019 , oc->fileName, ehdr->e_machine);
3023 IF_DEBUG(linker,debugBelch(
3024 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
3025 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
3027 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
3029 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3031 if (ehdr->e_shstrndx == SHN_UNDEF) {
3032 errorBelch("%s: no section header string table", oc->fileName);
3035 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
3037 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
3040 for (i = 0; i < ehdr->e_shnum; i++) {
3041 IF_DEBUG(linker,debugBelch("%2d: ", i ));
3042 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
3043 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
3044 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
3045 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
3046 ehdrC + shdr[i].sh_offset,
3047 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
3049 if (shdr[i].sh_type == SHT_REL) {
3050 IF_DEBUG(linker,debugBelch("Rel " ));
3051 } else if (shdr[i].sh_type == SHT_RELA) {
3052 IF_DEBUG(linker,debugBelch("RelA " ));
3054 IF_DEBUG(linker,debugBelch(" "));
3057 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
3061 IF_DEBUG(linker,debugBelch( "\nString tables" ));
3064 for (i = 0; i < ehdr->e_shnum; i++) {
3065 if (shdr[i].sh_type == SHT_STRTAB
3066 /* Ignore the section header's string table. */
3067 && i != ehdr->e_shstrndx
3068 /* Ignore string tables named .stabstr, as they contain
3070 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
3072 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
3073 strtab = ehdrC + shdr[i].sh_offset;
3078 errorBelch("%s: no string tables, or too many", oc->fileName);
3083 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
3084 for (i = 0; i < ehdr->e_shnum; i++) {
3085 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3086 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
3088 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3089 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3090 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
3092 (long)shdr[i].sh_size % sizeof(Elf_Sym)
3094 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
3095 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
3098 for (j = 0; j < nent; j++) {
3099 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3100 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3101 (int)stab[j].st_shndx,
3102 (int)stab[j].st_size,
3103 (char*)stab[j].st_value ));
3105 IF_DEBUG(linker,debugBelch("type=" ));
3106 switch (ELF_ST_TYPE(stab[j].st_info)) {
3107 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3108 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3109 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3110 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3111 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3112 default: IF_DEBUG(linker,debugBelch("? " )); break;
3114 IF_DEBUG(linker,debugBelch(" " ));
3116 IF_DEBUG(linker,debugBelch("bind=" ));
3117 switch (ELF_ST_BIND(stab[j].st_info)) {
3118 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3119 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3120 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3121 default: IF_DEBUG(linker,debugBelch("? " )); break;
3123 IF_DEBUG(linker,debugBelch(" " ));
3125 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3129 if (nsymtabs == 0) {
3130 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3137 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3141 if (hdr->sh_type == SHT_PROGBITS
3142 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3143 /* .text-style section */
3144 return SECTIONKIND_CODE_OR_RODATA;
3147 if (hdr->sh_type == SHT_PROGBITS
3148 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3149 /* .data-style section */
3150 return SECTIONKIND_RWDATA;
3153 if (hdr->sh_type == SHT_PROGBITS
3154 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3155 /* .rodata-style section */
3156 return SECTIONKIND_CODE_OR_RODATA;
3159 if (hdr->sh_type == SHT_NOBITS
3160 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3161 /* .bss-style section */
3163 return SECTIONKIND_RWDATA;
3166 return SECTIONKIND_OTHER;
3171 ocGetNames_ELF ( ObjectCode* oc )
3176 char* ehdrC = (char*)(oc->image);
3177 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3178 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3179 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3181 ASSERT(symhash != NULL);
3184 errorBelch("%s: no strtab", oc->fileName);
3189 for (i = 0; i < ehdr->e_shnum; i++) {
3190 /* Figure out what kind of section it is. Logic derived from
3191 Figure 1.14 ("Special Sections") of the ELF document
3192 ("Portable Formats Specification, Version 1.1"). */
3194 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3196 if (is_bss && shdr[i].sh_size > 0) {
3197 /* This is a non-empty .bss section. Allocate zeroed space for
3198 it, and set its .sh_offset field such that
3199 ehdrC + .sh_offset == addr_of_zeroed_space. */
3200 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3201 "ocGetNames_ELF(BSS)");
3202 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3204 debugBelch("BSS section at 0x%x, size %d\n",
3205 zspace, shdr[i].sh_size);
3209 /* fill in the section info */
3210 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3211 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3212 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3213 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3216 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3218 /* copy stuff into this module's object symbol table */
3219 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3220 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3222 oc->n_symbols = nent;
3223 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3224 "ocGetNames_ELF(oc->symbols)");
3226 for (j = 0; j < nent; j++) {
3228 char isLocal = FALSE; /* avoids uninit-var warning */
3230 char* nm = strtab + stab[j].st_name;
3231 int secno = stab[j].st_shndx;
3233 /* Figure out if we want to add it; if so, set ad to its
3234 address. Otherwise leave ad == NULL. */
3236 if (secno == SHN_COMMON) {
3238 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3240 debugBelch("COMMON symbol, size %d name %s\n",
3241 stab[j].st_size, nm);
3243 /* Pointless to do addProddableBlock() for this area,
3244 since the linker should never poke around in it. */
3247 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3248 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3250 /* and not an undefined symbol */
3251 && stab[j].st_shndx != SHN_UNDEF
3252 /* and not in a "special section" */
3253 && stab[j].st_shndx < SHN_LORESERVE
3255 /* and it's a not a section or string table or anything silly */
3256 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3257 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3258 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3261 /* Section 0 is the undefined section, hence > and not >=. */
3262 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3264 if (shdr[secno].sh_type == SHT_NOBITS) {
3265 debugBelch(" BSS symbol, size %d off %d name %s\n",
3266 stab[j].st_size, stab[j].st_value, nm);
3269 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3270 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3273 #ifdef ELF_FUNCTION_DESC
3274 /* dlsym() and the initialisation table both give us function
3275 * descriptors, so to be consistent we store function descriptors
3276 * in the symbol table */
3277 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3278 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3280 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s\n",
3281 ad, oc->fileName, nm ));
3286 /* And the decision is ... */
3290 oc->symbols[j] = nm;
3293 /* Ignore entirely. */
3295 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3299 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3300 strtab + stab[j].st_name ));
3303 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3304 (int)ELF_ST_BIND(stab[j].st_info),
3305 (int)ELF_ST_TYPE(stab[j].st_info),
3306 (int)stab[j].st_shndx,
3307 strtab + stab[j].st_name
3310 oc->symbols[j] = NULL;
3319 /* Do ELF relocations which lack an explicit addend. All x86-linux
3320 relocations appear to be of this form. */
3322 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3323 Elf_Shdr* shdr, int shnum,
3324 Elf_Sym* stab, char* strtab )
3329 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3330 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3331 int target_shndx = shdr[shnum].sh_info;
3332 int symtab_shndx = shdr[shnum].sh_link;
3334 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3335 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3336 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3337 target_shndx, symtab_shndx ));
3339 /* Skip sections that we're not interested in. */
3342 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3343 if (kind == SECTIONKIND_OTHER) {
3344 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3349 for (j = 0; j < nent; j++) {
3350 Elf_Addr offset = rtab[j].r_offset;
3351 Elf_Addr info = rtab[j].r_info;
3353 Elf_Addr P = ((Elf_Addr)targ) + offset;
3354 Elf_Word* pP = (Elf_Word*)P;
3359 StgStablePtr stablePtr;
3362 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3363 j, (void*)offset, (void*)info ));
3365 IF_DEBUG(linker,debugBelch( " ZERO" ));
3368 Elf_Sym sym = stab[ELF_R_SYM(info)];
3369 /* First see if it is a local symbol. */
3370 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3371 /* Yes, so we can get the address directly from the ELF symbol
3373 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3375 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3376 + stab[ELF_R_SYM(info)].st_value);
3379 symbol = strtab + sym.st_name;
3380 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3381 if (NULL == stablePtr) {
3382 /* No, so look up the name in our global table. */
3383 S_tmp = lookupSymbol( symbol );
3384 S = (Elf_Addr)S_tmp;
3386 stableVal = deRefStablePtr( stablePtr );
3388 S = (Elf_Addr)S_tmp;
3392 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3395 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3398 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3399 (void*)P, (void*)S, (void*)A ));
3400 checkProddableBlock ( oc, pP );
3404 switch (ELF_R_TYPE(info)) {
3405 # ifdef i386_HOST_ARCH
3406 case R_386_32: *pP = value; break;
3407 case R_386_PC32: *pP = value - P; break;
3410 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3411 oc->fileName, (lnat)ELF_R_TYPE(info));
3419 /* Do ELF relocations for which explicit addends are supplied.
3420 sparc-solaris relocations appear to be of this form. */
3422 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3423 Elf_Shdr* shdr, int shnum,
3424 Elf_Sym* stab, char* strtab )
3427 char *symbol = NULL;
3429 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3430 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3431 int target_shndx = shdr[shnum].sh_info;
3432 int symtab_shndx = shdr[shnum].sh_link;
3434 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3435 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3436 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3437 target_shndx, symtab_shndx ));
3439 for (j = 0; j < nent; j++) {
3440 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3441 /* This #ifdef only serves to avoid unused-var warnings. */
3442 Elf_Addr offset = rtab[j].r_offset;
3443 Elf_Addr P = targ + offset;
3445 Elf_Addr info = rtab[j].r_info;
3446 Elf_Addr A = rtab[j].r_addend;
3450 # if defined(sparc_HOST_ARCH)
3451 Elf_Word* pP = (Elf_Word*)P;
3453 # elif defined(ia64_HOST_ARCH)
3454 Elf64_Xword *pP = (Elf64_Xword *)P;
3456 # elif defined(powerpc_HOST_ARCH)
3460 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3461 j, (void*)offset, (void*)info,
3464 IF_DEBUG(linker,debugBelch( " ZERO" ));
3467 Elf_Sym sym = stab[ELF_R_SYM(info)];
3468 /* First see if it is a local symbol. */
3469 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3470 /* Yes, so we can get the address directly from the ELF symbol
3472 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3474 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3475 + stab[ELF_R_SYM(info)].st_value);
3476 #ifdef ELF_FUNCTION_DESC
3477 /* Make a function descriptor for this function */
3478 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3479 S = allocateFunctionDesc(S + A);
3484 /* No, so look up the name in our global table. */
3485 symbol = strtab + sym.st_name;
3486 S_tmp = lookupSymbol( symbol );
3487 S = (Elf_Addr)S_tmp;
3489 #ifdef ELF_FUNCTION_DESC
3490 /* If a function, already a function descriptor - we would
3491 have to copy it to add an offset. */
3492 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3493 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3497 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3500 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3503 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3504 (void*)P, (void*)S, (void*)A ));
3505 /* checkProddableBlock ( oc, (void*)P ); */
3509 switch (ELF_R_TYPE(info)) {
3510 # if defined(sparc_HOST_ARCH)
3511 case R_SPARC_WDISP30:
3512 w1 = *pP & 0xC0000000;
3513 w2 = (Elf_Word)((value - P) >> 2);
3514 ASSERT((w2 & 0xC0000000) == 0);
3519 w1 = *pP & 0xFFC00000;
3520 w2 = (Elf_Word)(value >> 10);
3521 ASSERT((w2 & 0xFFC00000) == 0);
3527 w2 = (Elf_Word)(value & 0x3FF);
3528 ASSERT((w2 & ~0x3FF) == 0);
3532 /* According to the Sun documentation:
3534 This relocation type resembles R_SPARC_32, except it refers to an
3535 unaligned word. That is, the word to be relocated must be treated
3536 as four separate bytes with arbitrary alignment, not as a word
3537 aligned according to the architecture requirements.
3539 (JRS: which means that freeloading on the R_SPARC_32 case
3540 is probably wrong, but hey ...)
3544 w2 = (Elf_Word)value;
3547 # elif defined(ia64_HOST_ARCH)
3548 case R_IA64_DIR64LSB:
3549 case R_IA64_FPTR64LSB:
3552 case R_IA64_PCREL64LSB:
3555 case R_IA64_SEGREL64LSB:
3556 addr = findElfSegment(ehdrC, value);
3559 case R_IA64_GPREL22:
3560 ia64_reloc_gprel22(P, value);
3562 case R_IA64_LTOFF22:
3563 case R_IA64_LTOFF22X:
3564 case R_IA64_LTOFF_FPTR22:
3565 addr = allocateGOTEntry(value);
3566 ia64_reloc_gprel22(P, addr);
3568 case R_IA64_PCREL21B:
3569 ia64_reloc_pcrel21(P, S, oc);
3572 /* This goes with R_IA64_LTOFF22X and points to the load to
3573 * convert into a move. We don't implement relaxation. */
3575 # elif defined(powerpc_HOST_ARCH)
3576 case R_PPC_ADDR16_LO:
3577 *(Elf32_Half*) P = value;
3580 case R_PPC_ADDR16_HI:
3581 *(Elf32_Half*) P = value >> 16;
3584 case R_PPC_ADDR16_HA:
3585 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3589 *(Elf32_Word *) P = value;
3593 *(Elf32_Word *) P = value - P;
3599 if( delta << 6 >> 6 != delta )
3601 value = (Elf_Addr) (&makeSymbolExtra( oc, ELF_R_SYM(info), value )
3605 if( value == 0 || delta << 6 >> 6 != delta )
3607 barf( "Unable to make SymbolExtra for #%d",
3613 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3614 | (delta & 0x3fffffc);
3618 #if x86_64_HOST_ARCH
3620 *(Elf64_Xword *)P = value;
3625 StgInt64 off = value - P;
3626 if (off >= 0x7fffffffL || off < -0x80000000L) {
3627 #if X86_64_ELF_NONPIC_HACK
3628 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3630 off = pltAddress + A - P;
3632 barf("R_X86_64_PC32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3633 symbol, off, oc->fileName );
3636 *(Elf64_Word *)P = (Elf64_Word)off;
3642 StgInt64 off = value - P;
3643 *(Elf64_Word *)P = (Elf64_Word)off;
3648 if (value >= 0x7fffffffL) {
3649 #if X86_64_ELF_NONPIC_HACK
3650 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3652 value = pltAddress + A;
3654 barf("R_X86_64_32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3655 symbol, value, oc->fileName );
3658 *(Elf64_Word *)P = (Elf64_Word)value;
3662 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3663 #if X86_64_ELF_NONPIC_HACK
3664 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3666 value = pltAddress + A;
3668 barf("R_X86_64_32S relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3669 symbol, value, oc->fileName );
3672 *(Elf64_Sword *)P = (Elf64_Sword)value;
3675 case R_X86_64_GOTPCREL:
3677 StgInt64 gotAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)->addr;
3678 StgInt64 off = gotAddress + A - P;
3679 *(Elf64_Word *)P = (Elf64_Word)off;
3683 case R_X86_64_PLT32:
3685 StgInt64 off = value - P;
3686 if (off >= 0x7fffffffL || off < -0x80000000L) {
3687 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3689 off = pltAddress + A - P;
3691 *(Elf64_Word *)P = (Elf64_Word)off;
3697 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3698 oc->fileName, (lnat)ELF_R_TYPE(info));
3707 ocResolve_ELF ( ObjectCode* oc )
3711 Elf_Sym* stab = NULL;
3712 char* ehdrC = (char*)(oc->image);
3713 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3714 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3716 /* first find "the" symbol table */
3717 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3719 /* also go find the string table */
3720 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3722 if (stab == NULL || strtab == NULL) {
3723 errorBelch("%s: can't find string or symbol table", oc->fileName);
3727 /* Process the relocation sections. */
3728 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3729 if (shdr[shnum].sh_type == SHT_REL) {
3730 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3731 shnum, stab, strtab );
3735 if (shdr[shnum].sh_type == SHT_RELA) {
3736 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3737 shnum, stab, strtab );
3742 #if defined(powerpc_HOST_ARCH)
3743 ocFlushInstructionCache( oc );
3751 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3752 * at the front. The following utility functions pack and unpack instructions, and
3753 * take care of the most common relocations.
3756 #ifdef ia64_HOST_ARCH
3759 ia64_extract_instruction(Elf64_Xword *target)
3762 int slot = (Elf_Addr)target & 3;
3763 target = (Elf_Addr)target & ~3;
3771 return ((w1 >> 5) & 0x1ffffffffff);
3773 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3777 barf("ia64_extract_instruction: invalid slot %p", target);
3782 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3784 int slot = (Elf_Addr)target & 3;
3785 target = (Elf_Addr)target & ~3;
3790 *target |= value << 5;
3793 *target |= value << 46;
3794 *(target+1) |= value >> 18;
3797 *(target+1) |= value << 23;
3803 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3805 Elf64_Xword instruction;
3806 Elf64_Sxword rel_value;
3808 rel_value = value - gp_val;
3809 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3810 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3812 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3813 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3814 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3815 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3816 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3817 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3821 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3823 Elf64_Xword instruction;
3824 Elf64_Sxword rel_value;
3827 entry = allocatePLTEntry(value, oc);
3829 rel_value = (entry >> 4) - (target >> 4);
3830 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3831 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3833 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3834 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3835 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3836 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3842 * PowerPC & X86_64 ELF specifics
3845 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3847 static int ocAllocateSymbolExtras_ELF( ObjectCode *oc )
3853 ehdr = (Elf_Ehdr *) oc->image;
3854 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3856 for( i = 0; i < ehdr->e_shnum; i++ )
3857 if( shdr[i].sh_type == SHT_SYMTAB )
3860 if( i == ehdr->e_shnum )
3862 errorBelch( "This ELF file contains no symtab" );
3866 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3868 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3869 (int) shdr[i].sh_entsize, (int) sizeof( Elf_Sym ) );
3874 return ocAllocateSymbolExtras( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3877 #endif /* powerpc */
3881 /* --------------------------------------------------------------------------
3883 * ------------------------------------------------------------------------*/
3885 #if defined(OBJFORMAT_MACHO)
3888 Support for MachO linking on Darwin/MacOS X
3889 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3891 I hereby formally apologize for the hackish nature of this code.
3892 Things that need to be done:
3893 *) implement ocVerifyImage_MachO
3894 *) add still more sanity checks.
3897 #if x86_64_HOST_ARCH || powerpc64_HOST_ARCH
3898 #define mach_header mach_header_64
3899 #define segment_command segment_command_64
3900 #define section section_64
3901 #define nlist nlist_64
3904 #ifdef powerpc_HOST_ARCH
3905 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3907 struct mach_header *header = (struct mach_header *) oc->image;
3908 struct load_command *lc = (struct load_command *) (header + 1);
3911 for( i = 0; i < header->ncmds; i++ )
3913 if( lc->cmd == LC_SYMTAB )
3915 // Find out the first and last undefined external
3916 // symbol, so we don't have to allocate too many
3918 struct symtab_command *symLC = (struct symtab_command *) lc;
3919 unsigned min = symLC->nsyms, max = 0;
3920 struct nlist *nlist =
3921 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3923 for(i=0;i<symLC->nsyms;i++)
3925 if(nlist[i].n_type & N_STAB)
3927 else if(nlist[i].n_type & N_EXT)
3929 if((nlist[i].n_type & N_TYPE) == N_UNDF
3930 && (nlist[i].n_value == 0))
3940 return ocAllocateSymbolExtras(oc, max - min + 1, min);
3945 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3947 return ocAllocateSymbolExtras(oc,0,0);
3950 #ifdef x86_64_HOST_ARCH
3951 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3953 struct mach_header *header = (struct mach_header *) oc->image;
3954 struct load_command *lc = (struct load_command *) (header + 1);
3957 for( i = 0; i < header->ncmds; i++ )
3959 if( lc->cmd == LC_SYMTAB )
3961 // Just allocate one entry for every symbol
3962 struct symtab_command *symLC = (struct symtab_command *) lc;
3964 return ocAllocateSymbolExtras(oc, symLC->nsyms, 0);
3967 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3969 return ocAllocateSymbolExtras(oc,0,0);
3973 static int ocVerifyImage_MachO(ObjectCode* oc)
3975 char *image = (char*) oc->image;
3976 struct mach_header *header = (struct mach_header*) image;
3978 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
3979 if(header->magic != MH_MAGIC_64)
3982 if(header->magic != MH_MAGIC)
3985 // FIXME: do some more verifying here
3989 static int resolveImports(
3992 struct symtab_command *symLC,
3993 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3994 unsigned long *indirectSyms,
3995 struct nlist *nlist)
3998 size_t itemSize = 4;
4001 int isJumpTable = 0;
4002 if(!strcmp(sect->sectname,"__jump_table"))
4006 ASSERT(sect->reserved2 == itemSize);
4010 for(i=0; i*itemSize < sect->size;i++)
4012 // according to otool, reserved1 contains the first index into the indirect symbol table
4013 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
4014 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4017 if((symbol->n_type & N_TYPE) == N_UNDF
4018 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
4019 addr = (void*) (symbol->n_value);
4021 addr = lookupSymbol(nm);
4024 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
4032 checkProddableBlock(oc,image + sect->offset + i*itemSize);
4033 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
4034 *(unsigned*)(image + sect->offset + i*itemSize + 1)
4035 = (char*)addr - (image + sect->offset + i*itemSize + 5);
4040 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
4041 ((void**)(image + sect->offset))[i] = addr;
4048 static unsigned long relocateAddress(
4051 struct section* sections,
4052 unsigned long address)
4055 for(i = 0; i < nSections; i++)
4057 if(sections[i].addr <= address
4058 && address < sections[i].addr + sections[i].size)
4060 return (unsigned long)oc->image
4061 + sections[i].offset + address - sections[i].addr;
4064 barf("Invalid Mach-O file:"
4065 "Address out of bounds while relocating object file");
4069 static int relocateSection(
4072 struct symtab_command *symLC, struct nlist *nlist,
4073 int nSections, struct section* sections, struct section *sect)
4075 struct relocation_info *relocs;
4078 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
4080 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
4082 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
4084 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
4088 relocs = (struct relocation_info*) (image + sect->reloff);
4092 #ifdef x86_64_HOST_ARCH
4093 struct relocation_info *reloc = &relocs[i];
4095 char *thingPtr = image + sect->offset + reloc->r_address;
4099 int type = reloc->r_type;
4101 checkProddableBlock(oc,thingPtr);
4102 switch(reloc->r_length)
4105 thing = *(uint8_t*)thingPtr;
4106 baseValue = (uint64_t)thingPtr + 1;
4109 thing = *(uint16_t*)thingPtr;
4110 baseValue = (uint64_t)thingPtr + 2;
4113 thing = *(uint32_t*)thingPtr;
4114 baseValue = (uint64_t)thingPtr + 4;
4117 thing = *(uint64_t*)thingPtr;
4118 baseValue = (uint64_t)thingPtr + 8;
4121 barf("Unknown size.");
4124 if(type == X86_64_RELOC_GOT
4125 || type == X86_64_RELOC_GOT_LOAD)
4127 ASSERT(reloc->r_extern);
4128 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)->addr;
4130 type = X86_64_RELOC_SIGNED;
4132 else if(reloc->r_extern)
4134 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4135 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4136 if(symbol->n_value == 0)
4137 value = (uint64_t) lookupSymbol(nm);
4139 value = relocateAddress(oc, nSections, sections,
4144 value = sections[reloc->r_symbolnum-1].offset
4145 - sections[reloc->r_symbolnum-1].addr
4149 if(type == X86_64_RELOC_BRANCH)
4151 if((int32_t)(value - baseValue) != (int64_t)(value - baseValue))
4153 ASSERT(reloc->r_extern);
4154 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)
4157 ASSERT((int32_t)(value - baseValue) == (int64_t)(value - baseValue));
4158 type = X86_64_RELOC_SIGNED;
4163 case X86_64_RELOC_UNSIGNED:
4164 ASSERT(!reloc->r_pcrel);
4167 case X86_64_RELOC_SIGNED:
4168 ASSERT(reloc->r_pcrel);
4169 thing += value - baseValue;
4171 case X86_64_RELOC_SUBTRACTOR:
4172 ASSERT(!reloc->r_pcrel);
4176 barf("unkown relocation");
4179 switch(reloc->r_length)
4182 *(uint8_t*)thingPtr = thing;
4185 *(uint16_t*)thingPtr = thing;
4188 *(uint32_t*)thingPtr = thing;
4191 *(uint64_t*)thingPtr = thing;
4195 if(relocs[i].r_address & R_SCATTERED)
4197 struct scattered_relocation_info *scat =
4198 (struct scattered_relocation_info*) &relocs[i];
4202 if(scat->r_length == 2)
4204 unsigned long word = 0;
4205 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
4206 checkProddableBlock(oc,wordPtr);
4208 // Note on relocation types:
4209 // i386 uses the GENERIC_RELOC_* types,
4210 // while ppc uses special PPC_RELOC_* types.
4211 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
4212 // in both cases, all others are different.
4213 // Therefore, we use GENERIC_RELOC_VANILLA
4214 // and GENERIC_RELOC_PAIR instead of the PPC variants,
4215 // and use #ifdefs for the other types.
4217 // Step 1: Figure out what the relocated value should be
4218 if(scat->r_type == GENERIC_RELOC_VANILLA)
4220 word = *wordPtr + (unsigned long) relocateAddress(
4227 #ifdef powerpc_HOST_ARCH
4228 else if(scat->r_type == PPC_RELOC_SECTDIFF
4229 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
4230 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
4231 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
4233 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
4236 struct scattered_relocation_info *pair =
4237 (struct scattered_relocation_info*) &relocs[i+1];
4239 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
4240 barf("Invalid Mach-O file: "
4241 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
4243 word = (unsigned long)
4244 (relocateAddress(oc, nSections, sections, scat->r_value)
4245 - relocateAddress(oc, nSections, sections, pair->r_value));
4248 #ifdef powerpc_HOST_ARCH
4249 else if(scat->r_type == PPC_RELOC_HI16
4250 || scat->r_type == PPC_RELOC_LO16
4251 || scat->r_type == PPC_RELOC_HA16
4252 || scat->r_type == PPC_RELOC_LO14)
4253 { // these are generated by label+offset things
4254 struct relocation_info *pair = &relocs[i+1];
4255 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
4256 barf("Invalid Mach-O file: "
4257 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
4259 if(scat->r_type == PPC_RELOC_LO16)
4261 word = ((unsigned short*) wordPtr)[1];
4262 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4264 else if(scat->r_type == PPC_RELOC_LO14)
4266 barf("Unsupported Relocation: PPC_RELOC_LO14");
4267 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
4268 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4270 else if(scat->r_type == PPC_RELOC_HI16)
4272 word = ((unsigned short*) wordPtr)[1] << 16;
4273 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4275 else if(scat->r_type == PPC_RELOC_HA16)
4277 word = ((unsigned short*) wordPtr)[1] << 16;
4278 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4282 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4289 continue; // ignore the others
4291 #ifdef powerpc_HOST_ARCH
4292 if(scat->r_type == GENERIC_RELOC_VANILLA
4293 || scat->r_type == PPC_RELOC_SECTDIFF)
4295 if(scat->r_type == GENERIC_RELOC_VANILLA
4296 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4301 #ifdef powerpc_HOST_ARCH
4302 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4304 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4306 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4308 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4310 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4312 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4313 + ((word & (1<<15)) ? 1 : 0);
4319 continue; // FIXME: I hope it's OK to ignore all the others.
4323 struct relocation_info *reloc = &relocs[i];
4324 if(reloc->r_pcrel && !reloc->r_extern)
4327 if(reloc->r_length == 2)
4329 unsigned long word = 0;
4330 #ifdef powerpc_HOST_ARCH
4331 unsigned long jumpIsland = 0;
4332 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4333 // to avoid warning and to catch
4337 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4338 checkProddableBlock(oc,wordPtr);
4340 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4344 #ifdef powerpc_HOST_ARCH
4345 else if(reloc->r_type == PPC_RELOC_LO16)
4347 word = ((unsigned short*) wordPtr)[1];
4348 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4350 else if(reloc->r_type == PPC_RELOC_HI16)
4352 word = ((unsigned short*) wordPtr)[1] << 16;
4353 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4355 else if(reloc->r_type == PPC_RELOC_HA16)
4357 word = ((unsigned short*) wordPtr)[1] << 16;
4358 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4360 else if(reloc->r_type == PPC_RELOC_BR24)
4363 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4367 if(!reloc->r_extern)
4370 sections[reloc->r_symbolnum-1].offset
4371 - sections[reloc->r_symbolnum-1].addr
4378 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4379 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4380 void *symbolAddress = lookupSymbol(nm);
4383 errorBelch("\nunknown symbol `%s'", nm);
4389 #ifdef powerpc_HOST_ARCH
4390 // In the .o file, this should be a relative jump to NULL
4391 // and we'll change it to a relative jump to the symbol
4392 ASSERT(word + reloc->r_address == 0);
4393 jumpIsland = (unsigned long)
4394 &makeSymbolExtra(oc,
4396 (unsigned long) symbolAddress)
4400 offsetToJumpIsland = word + jumpIsland
4401 - (((long)image) + sect->offset - sect->addr);
4404 word += (unsigned long) symbolAddress
4405 - (((long)image) + sect->offset - sect->addr);
4409 word += (unsigned long) symbolAddress;
4413 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4418 #ifdef powerpc_HOST_ARCH
4419 else if(reloc->r_type == PPC_RELOC_LO16)
4421 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4424 else if(reloc->r_type == PPC_RELOC_HI16)
4426 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4429 else if(reloc->r_type == PPC_RELOC_HA16)
4431 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4432 + ((word & (1<<15)) ? 1 : 0);
4435 else if(reloc->r_type == PPC_RELOC_BR24)
4437 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4439 // The branch offset is too large.
4440 // Therefore, we try to use a jump island.
4443 barf("unconditional relative branch out of range: "
4444 "no jump island available");
4447 word = offsetToJumpIsland;
4448 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4449 barf("unconditional relative branch out of range: "
4450 "jump island out of range");
4452 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4457 barf("\nunknown relocation %d",reloc->r_type);
4465 static int ocGetNames_MachO(ObjectCode* oc)
4467 char *image = (char*) oc->image;
4468 struct mach_header *header = (struct mach_header*) image;
4469 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4470 unsigned i,curSymbol = 0;
4471 struct segment_command *segLC = NULL;
4472 struct section *sections;
4473 struct symtab_command *symLC = NULL;
4474 struct nlist *nlist;
4475 unsigned long commonSize = 0;
4476 char *commonStorage = NULL;
4477 unsigned long commonCounter;
4479 for(i=0;i<header->ncmds;i++)
4481 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4482 segLC = (struct segment_command*) lc;
4483 else if(lc->cmd == LC_SYMTAB)
4484 symLC = (struct symtab_command*) lc;
4485 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4488 sections = (struct section*) (segLC+1);
4489 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4493 barf("ocGetNames_MachO: no segment load command");
4495 for(i=0;i<segLC->nsects;i++)
4497 if(sections[i].size == 0)
4500 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4502 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4503 "ocGetNames_MachO(common symbols)");
4504 sections[i].offset = zeroFillArea - image;
4507 if(!strcmp(sections[i].sectname,"__text"))
4508 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4509 (void*) (image + sections[i].offset),
4510 (void*) (image + sections[i].offset + sections[i].size));
4511 else if(!strcmp(sections[i].sectname,"__const"))
4512 addSection(oc, SECTIONKIND_RWDATA,
4513 (void*) (image + sections[i].offset),
4514 (void*) (image + sections[i].offset + sections[i].size));
4515 else if(!strcmp(sections[i].sectname,"__data"))
4516 addSection(oc, SECTIONKIND_RWDATA,
4517 (void*) (image + sections[i].offset),
4518 (void*) (image + sections[i].offset + sections[i].size));
4519 else if(!strcmp(sections[i].sectname,"__bss")
4520 || !strcmp(sections[i].sectname,"__common"))
4521 addSection(oc, SECTIONKIND_RWDATA,
4522 (void*) (image + sections[i].offset),
4523 (void*) (image + sections[i].offset + sections[i].size));
4525 addProddableBlock(oc, (void*) (image + sections[i].offset),
4529 // count external symbols defined here
4533 for(i=0;i<symLC->nsyms;i++)
4535 if(nlist[i].n_type & N_STAB)
4537 else if(nlist[i].n_type & N_EXT)
4539 if((nlist[i].n_type & N_TYPE) == N_UNDF
4540 && (nlist[i].n_value != 0))
4542 commonSize += nlist[i].n_value;
4545 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4550 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4551 "ocGetNames_MachO(oc->symbols)");
4555 for(i=0;i<symLC->nsyms;i++)
4557 if(nlist[i].n_type & N_STAB)
4559 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4561 if(nlist[i].n_type & N_EXT)
4563 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4564 if((nlist[i].n_desc & N_WEAK_DEF) && lookupSymbol(nm))
4565 ; // weak definition, and we already have a definition
4568 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4570 + sections[nlist[i].n_sect-1].offset
4571 - sections[nlist[i].n_sect-1].addr
4572 + nlist[i].n_value);
4573 oc->symbols[curSymbol++] = nm;
4580 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4581 commonCounter = (unsigned long)commonStorage;
4584 for(i=0;i<symLC->nsyms;i++)
4586 if((nlist[i].n_type & N_TYPE) == N_UNDF
4587 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4589 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4590 unsigned long sz = nlist[i].n_value;
4592 nlist[i].n_value = commonCounter;
4594 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4595 (void*)commonCounter);
4596 oc->symbols[curSymbol++] = nm;
4598 commonCounter += sz;
4605 static int ocResolve_MachO(ObjectCode* oc)
4607 char *image = (char*) oc->image;
4608 struct mach_header *header = (struct mach_header*) image;
4609 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4611 struct segment_command *segLC = NULL;
4612 struct section *sections;
4613 struct symtab_command *symLC = NULL;
4614 struct dysymtab_command *dsymLC = NULL;
4615 struct nlist *nlist;
4617 for(i=0;i<header->ncmds;i++)
4619 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4620 segLC = (struct segment_command*) lc;
4621 else if(lc->cmd == LC_SYMTAB)
4622 symLC = (struct symtab_command*) lc;
4623 else if(lc->cmd == LC_DYSYMTAB)
4624 dsymLC = (struct dysymtab_command*) lc;
4625 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4628 sections = (struct section*) (segLC+1);
4629 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4634 unsigned long *indirectSyms
4635 = (unsigned long*) (image + dsymLC->indirectsymoff);
4637 for(i=0;i<segLC->nsects;i++)
4639 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4640 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4641 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4643 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4646 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4647 || !strcmp(sections[i].sectname,"__pointers"))
4649 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4652 else if(!strcmp(sections[i].sectname,"__jump_table"))
4654 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4660 for(i=0;i<segLC->nsects;i++)
4662 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4666 #if defined (powerpc_HOST_ARCH)
4667 ocFlushInstructionCache( oc );
4673 #ifdef powerpc_HOST_ARCH
4675 * The Mach-O object format uses leading underscores. But not everywhere.
4676 * There is a small number of runtime support functions defined in
4677 * libcc_dynamic.a whose name does not have a leading underscore.
4678 * As a consequence, we can't get their address from C code.
4679 * We have to use inline assembler just to take the address of a function.
4683 static void machoInitSymbolsWithoutUnderscore()
4685 extern void* symbolsWithoutUnderscore[];
4686 void **p = symbolsWithoutUnderscore;
4687 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4689 #undef SymI_NeedsProto
4690 #define SymI_NeedsProto(x) \
4691 __asm__ volatile(".long " # x);
4693 RTS_MACHO_NOUNDERLINE_SYMBOLS
4695 __asm__ volatile(".text");
4697 #undef SymI_NeedsProto
4698 #define SymI_NeedsProto(x) \
4699 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4701 RTS_MACHO_NOUNDERLINE_SYMBOLS
4703 #undef SymI_NeedsProto
4708 * Figure out by how much to shift the entire Mach-O file in memory
4709 * when loading so that its single segment ends up 16-byte-aligned
4711 static int machoGetMisalignment( FILE * f )
4713 struct mach_header header;
4716 fread(&header, sizeof(header), 1, f);
4719 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
4720 if(header.magic != MH_MAGIC_64)
4723 if(header.magic != MH_MAGIC)
4727 misalignment = (header.sizeofcmds + sizeof(header))
4730 return misalignment ? (16 - misalignment) : 0;