1 /* IBM RS/6000 native-dependent code for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1994, 1995, 1996, 1997, 1998
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
26 #include "xcoffsolib.h"
29 #include "libbfd.h" /* For bfd_cache_lookup (FIXME) */
31 #include "gdb-stabs.h"
33 #include <sys/ptrace.h>
36 #include <sys/param.h>
40 #include <sys/ioctl.h>
48 #define __LDINFO_PTRACE32__ /* for __ld_info32 */
49 #define __LDINFO_PTRACE64__ /* for __ld_info64 */
51 #include <sys/systemcfg.h>
53 /* On AIX4.3+, sys/ldr.h provides different versions of struct ld_info for
54 debugging 32-bit and 64-bit processes. Define a typedef and macros for
55 accessing fields in the appropriate structures. */
57 /* In 32-bit compilation mode (which is the only mode from which ptrace()
58 works on 4.3), __ld_info32 is #defined as equivalent to ld_info. */
64 /* Return whether the current architecture is 64-bit. */
69 # define ARCH64() (REGISTER_RAW_SIZE (0) == 8)
72 /* Union of 32-bit and 64-bit ".reg" core file sections. */
76 struct __context64 r64;
83 /* Union of 32-bit and 64-bit versions of ld_info. */
90 struct __ld_info32 l32;
91 struct __ld_info64 l64;
95 /* If compiling with 32-bit and 64-bit debugging capability (e.g. AIX 4.x),
96 declare and initialize a variable named VAR suitable for use as the arch64
97 parameter to the various LDI_*() macros. */
100 # define ARCH64_DECL(var)
102 # define ARCH64_DECL(var) int var = ARCH64 ()
105 /* Return LDI's FIELD for a 64-bit process if ARCH64 and for a 32-bit process
106 otherwise. This technique only works for FIELDs with the same data type in
107 32-bit and 64-bit versions of ld_info. */
110 # define LDI_FIELD(ldi, arch64, field) (ldi)->l32.ldinfo_##field
112 # define LDI_FIELD(ldi, arch64, field) \
113 (arch64 ? (ldi)->l64.ldinfo_##field : (ldi)->l32.ldinfo_##field)
116 /* Return various LDI fields for a 64-bit process if ARCH64 and for a 32-bit
117 process otherwise. */
119 #define LDI_NEXT(ldi, arch64) LDI_FIELD(ldi, arch64, next)
120 #define LDI_FD(ldi, arch64) LDI_FIELD(ldi, arch64, fd)
121 #define LDI_FILENAME(ldi, arch64) LDI_FIELD(ldi, arch64, filename)
123 extern struct vmap *map_vmap (bfd * bf, bfd * arch);
125 extern struct target_ops exec_ops;
127 static void vmap_exec (void);
129 static void vmap_ldinfo (LdInfo *);
131 static struct vmap *add_vmap (LdInfo *);
133 static int objfile_symbol_add (void *);
135 static void vmap_symtab (struct vmap *);
137 static void fetch_core_registers (char *, unsigned int, int, CORE_ADDR);
139 static void exec_one_dummy_insn (void);
142 fixup_breakpoints (CORE_ADDR low, CORE_ADDR high, CORE_ADDR delta);
144 /* Conversion from gdb-to-system special purpose register numbers. */
146 static int special_regs[] =
152 CTR, /* CTR_REGNUM */
153 XER, /* XER_REGNUM */
157 /* Call ptrace(REQ, ID, ADDR, DATA, BUF). */
160 ptrace32 (int req, int id, int *addr, int data, int *buf)
162 int ret = ptrace (req, id, (int *)addr, data, buf);
164 printf ("ptrace32 (%d, %d, 0x%x, %08x, 0x%x) = 0x%x\n",
165 req, id, (unsigned int)addr, data, (unsigned int)buf, ret);
170 /* Call ptracex(REQ, ID, ADDR, DATA, BUF). */
173 ptrace64 (int req, int id, long long addr, int data, int *buf)
176 int ret = ptracex (req, id, addr, data, buf);
181 printf ("ptrace64 (%d, %d, 0x%llx, %08x, 0x%x) = 0x%x\n",
182 req, id, addr, data, (unsigned int)buf, ret);
187 /* Fetch register REGNO from the inferior. */
190 fetch_register (int regno)
192 int *addr = (int *) ®isters[REGISTER_BYTE (regno)];
195 /* Retrieved values may be -1, so infer errors from errno. */
198 /* Floating-point registers. */
199 if (regno >= FP0_REGNUM && regno <= FPLAST_REGNUM)
201 nr = regno - FP0_REGNUM + FPR0;
202 ptrace32 (PT_READ_FPR, inferior_pid, addr, nr, 0);
205 /* Bogus register number. */
206 else if (regno > LAST_UISA_SP_REGNUM)
207 fprintf_unfiltered (gdb_stderr,
208 "gdb error: register no %d not implemented.\n",
211 /* Fixed-point registers. */
214 if (regno >= FIRST_UISA_SP_REGNUM)
215 nr = special_regs[regno - FIRST_UISA_SP_REGNUM];
220 *addr = ptrace32 (PT_READ_GPR, inferior_pid, (int *)nr, 0, 0);
223 /* PT_READ_GPR requires the buffer parameter to point to long long,
224 even if the register is really only 32 bits. */
226 ptrace64 (PT_READ_GPR, inferior_pid, nr, 0, (int *)&buf);
227 if (REGISTER_RAW_SIZE (regno) == 8)
228 memcpy (addr, &buf, 8);
235 register_valid[regno] = 1;
239 /* FIXME: this happens 3 times at the start of each 64-bit program. */
240 perror ("ptrace read");
246 /* Store register REGNO back into the inferior. */
249 store_register (int regno)
251 int *addr = (int *) ®isters[REGISTER_BYTE (regno)];
254 /* -1 can be a successful return value, so infer errors from errno. */
257 /* Floating-point registers. */
258 if (regno >= FP0_REGNUM && regno <= FPLAST_REGNUM)
260 nr = regno - FP0_REGNUM + FPR0;
261 ptrace32 (PT_WRITE_FPR, inferior_pid, addr, nr, 0);
264 /* Bogus register number. */
265 else if (regno > LAST_UISA_SP_REGNUM)
267 if (regno >= NUM_REGS)
268 fprintf_unfiltered (gdb_stderr,
269 "gdb error: register no %d not implemented.\n",
273 /* Fixed-point registers. */
276 if (regno == SP_REGNUM)
277 /* Execute one dummy instruction (which is a breakpoint) in inferior
278 process to give kernel a chance to do internal housekeeping.
279 Otherwise the following ptrace(2) calls will mess up user stack
280 since kernel will get confused about the bottom of the stack
282 exec_one_dummy_insn ();
284 if (regno >= FIRST_UISA_SP_REGNUM)
285 nr = special_regs[regno - FIRST_UISA_SP_REGNUM];
290 ptrace32 (PT_WRITE_GPR, inferior_pid, (int *)nr, *addr, 0);
293 /* PT_WRITE_GPR requires the buffer parameter to point to an 8-byte
294 area, even if the register is really only 32 bits. */
296 if (REGISTER_RAW_SIZE (regno) == 8)
297 memcpy (&buf, addr, 8);
300 ptrace64 (PT_WRITE_GPR, inferior_pid, nr, 0, (int *)&buf);
306 perror ("ptrace write");
311 /* Read from the inferior all registers if REGNO == -1 and just register
315 fetch_inferior_registers (int regno)
318 fetch_register (regno);
322 /* read 32 general purpose registers. */
323 for (regno = 0; regno < 32; regno++)
324 fetch_register (regno);
326 /* read general purpose floating point registers. */
327 for (regno = FP0_REGNUM; regno <= FPLAST_REGNUM; regno++)
328 fetch_register (regno);
330 /* read special registers. */
331 for (regno = FIRST_UISA_SP_REGNUM; regno <= LAST_UISA_SP_REGNUM; regno++)
332 fetch_register (regno);
336 /* Store our register values back into the inferior.
337 If REGNO is -1, do this for all registers.
338 Otherwise, REGNO specifies which register (so we can save time). */
341 store_inferior_registers (int regno)
344 store_register (regno);
348 /* write general purpose registers first! */
349 for (regno = GPR0; regno <= GPR31; regno++)
350 store_register (regno);
352 /* write floating point registers now. */
353 for (regno = FP0_REGNUM; regno <= FPLAST_REGNUM; regno++)
354 store_register (regno);
356 /* write special registers. */
358 for (regno = FIRST_UISA_SP_REGNUM; regno <= LAST_UISA_SP_REGNUM; regno++)
359 store_register (regno);
363 /* Store in *TO the 32-bit word at 32-bit-aligned ADDR in the child
364 process, which is 64-bit if ARCH64 and 32-bit otherwise. Return
368 read_word (CORE_ADDR from, int *to, int arch64)
370 /* Retrieved values may be -1, so infer errors from errno. */
374 *to = ptrace64 (PT_READ_I, inferior_pid, from, 0, NULL);
376 *to = ptrace32 (PT_READ_I, inferior_pid, (int *)(long) from, 0, NULL);
381 /* Copy LEN bytes to or from inferior's memory starting at MEMADDR
382 to debugger memory starting at MYADDR. Copy to inferior if
385 Returns the length copied, which is either the LEN argument or zero.
386 This xfer function does not do partial moves, since child_ops
387 doesn't allow memory operations to cross below us in the target stack
391 child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len,
392 int write, struct target_ops *target)
394 /* Round starting address down to 32-bit word boundary. */
395 int mask = sizeof (int) - 1;
396 CORE_ADDR addr = memaddr & ~(CORE_ADDR)mask;
398 /* Round ending address up to 32-bit word boundary. */
399 int count = ((memaddr + len - addr + mask) & ~(CORE_ADDR)mask)
402 /* Allocate word transfer buffer. */
403 int *buf = (int *) alloca (count * sizeof (int));
405 int arch64 = ARCH64 ();
410 /* Retrieve memory a word at a time. */
411 for (i = 0; i < count; i++, addr += sizeof (int))
413 if (!read_word (addr, buf + i, arch64))
418 /* Copy memory to supplied buffer. */
419 addr -= count * sizeof (int);
420 memcpy (myaddr, (char *)buf + (memaddr - addr), len);
424 /* Fetch leading memory needed for alignment. */
426 if (!read_word (addr, buf, arch64))
429 /* Fetch trailing memory needed for alignment. */
430 if (addr + count * sizeof (int) > memaddr + len)
431 if (!read_word (addr, buf + count - 1, arch64))
434 /* Copy supplied data into memory buffer. */
435 memcpy ((char *)buf + (memaddr - addr), myaddr, len);
437 /* Store memory one word at a time. */
438 for (i = 0, errno = 0; i < count; i++, addr += sizeof (int))
441 ptrace64 (PT_WRITE_D, inferior_pid, addr, buf[i], NULL);
443 ptrace32 (PT_WRITE_D, inferior_pid, (int *)(long) addr,
455 /* Execute one dummy breakpoint instruction. This way we give the kernel
456 a chance to do some housekeeping and update inferior's internal data,
460 exec_one_dummy_insn (void)
462 #define DUMMY_INSN_ADDR (TEXT_SEGMENT_BASE)+0x200
464 char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */
465 int ret, status, pid;
468 /* We plant one dummy breakpoint into DUMMY_INSN_ADDR address. We
469 assume that this address will never be executed again by the real
472 target_insert_breakpoint (DUMMY_INSN_ADDR, shadow_contents);
474 /* You might think this could be done with a single ptrace call, and
475 you'd be correct for just about every platform I've ever worked
476 on. However, rs6000-ibm-aix4.1.3 seems to have screwed this up --
477 the inferior never hits the breakpoint (it's also worth noting
478 powerpc-ibm-aix4.1.3 works correctly). */
479 prev_pc = read_pc ();
480 write_pc (DUMMY_INSN_ADDR);
482 ret = ptrace64 (PT_CONTINUE, inferior_pid, 1, 0, NULL);
484 ret = ptrace32 (PT_CONTINUE, inferior_pid, (int *)1, 0, NULL);
487 perror ("pt_continue");
491 pid = wait (&status);
493 while (pid != inferior_pid);
496 target_remove_breakpoint (DUMMY_INSN_ADDR, shadow_contents);
499 /* Fetch registers from the register section in core bfd. */
502 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
503 int which, CORE_ADDR reg_addr)
508 void *gprs, *sprs[7];
514 "Gdb error: unknown parameter to fetch_core_registers().\n");
519 regs = (CoreRegs *) core_reg_sect;
521 /* Retrieve register pointers. */
525 gprs = regs->r64.gpr;
526 fprs = regs->r64.fpr;
527 sprs[0] = ®s->r64.iar;
528 sprs[1] = ®s->r64.msr;
529 sprs[2] = ®s->r64.cr;
530 sprs[3] = ®s->r64.lr;
531 sprs[4] = ®s->r64.ctr;
532 sprs[5] = ®s->r64.xer;
536 gprs = regs->r32.gpr;
537 fprs = regs->r32.fpr;
538 sprs[0] = ®s->r32.iar;
539 sprs[1] = ®s->r32.msr;
540 sprs[2] = ®s->r32.cr;
541 sprs[3] = ®s->r32.lr;
542 sprs[4] = ®s->r32.ctr;
543 sprs[5] = ®s->r32.xer;
544 sprs[6] = ®s->r32.mq;
547 /* Copy from pointers to registers[]. */
549 memcpy (registers, gprs, 32 * (arch64 ? 8 : 4));
550 memcpy (registers + REGISTER_BYTE (FP0_REGNUM), fprs, 32 * 8);
551 for (i = FIRST_UISA_SP_REGNUM; i <= LAST_UISA_SP_REGNUM; i++)
553 size = REGISTER_RAW_SIZE (i);
555 memcpy (registers + REGISTER_BYTE (i),
556 sprs[i - FIRST_UISA_SP_REGNUM], size);
561 /* Copy information about text and data sections from LDI to VP for a 64-bit
562 process if ARCH64 and for a 32-bit process otherwise. */
565 vmap_secs (struct vmap *vp, LdInfo *ldi, int arch64)
569 vp->tstart = (CORE_ADDR) ldi->l64.ldinfo_textorg;
570 vp->tend = vp->tstart + ldi->l64.ldinfo_textsize;
571 vp->dstart = (CORE_ADDR) ldi->l64.ldinfo_dataorg;
572 vp->dend = vp->dstart + ldi->l64.ldinfo_datasize;
576 vp->tstart = (unsigned long) ldi->l32.ldinfo_textorg;
577 vp->tend = vp->tstart + ldi->l32.ldinfo_textsize;
578 vp->dstart = (unsigned long) ldi->l32.ldinfo_dataorg;
579 vp->dend = vp->dstart + ldi->l32.ldinfo_datasize;
582 /* The run time loader maps the file header in addition to the text
583 section and returns a pointer to the header in ldinfo_textorg.
584 Adjust the text start address to point to the real start address
585 of the text section. */
586 vp->tstart += vp->toffs;
589 /* handle symbol translation on vmapping */
592 vmap_symtab (struct vmap *vp)
594 register struct objfile *objfile;
595 struct section_offsets *new_offsets;
598 objfile = vp->objfile;
601 /* OK, it's not an objfile we opened ourselves.
602 Currently, that can only happen with the exec file, so
603 relocate the symbols for the symfile. */
604 if (symfile_objfile == NULL)
606 objfile = symfile_objfile;
608 else if (!vp->loaded)
609 /* If symbols are not yet loaded, offsets are not yet valid. */
612 new_offsets = (struct section_offsets *) alloca (SIZEOF_SECTION_OFFSETS);
614 for (i = 0; i < objfile->num_sections; ++i)
615 new_offsets->offsets[i] = ANOFFSET (objfile->section_offsets, i);
617 /* The symbols in the object file are linked to the VMA of the section,
618 relocate them VMA relative. */
619 new_offsets->offsets[SECT_OFF_TEXT (objfile)] = vp->tstart - vp->tvma;
620 new_offsets->offsets[SECT_OFF_DATA (objfile)] = vp->dstart - vp->dvma;
621 new_offsets->offsets[SECT_OFF_BSS (objfile)] = vp->dstart - vp->dvma;
623 objfile_relocate (objfile, new_offsets);
626 /* Add symbols for an objfile. */
629 objfile_symbol_add (void *arg)
631 struct objfile *obj = (struct objfile *) arg;
633 syms_from_objfile (obj, NULL, 0, 0);
634 new_symfile_objfile (obj, 0, 0);
638 /* Add symbols for a vmap. Return zero upon error. */
641 vmap_add_symbols (struct vmap *vp)
643 if (catch_errors (objfile_symbol_add, vp->objfile,
644 "Error while reading shared library symbols:\n",
647 /* Note this is only done if symbol reading was successful. */
655 /* Add a new vmap entry based on ldinfo() information.
657 If ldi->ldinfo_fd is not valid (e.g. this struct ld_info is from a
658 core file), the caller should set it to -1, and we will open the file.
660 Return the vmap new entry. */
663 add_vmap (LdInfo *ldi)
666 register char *mem, *objname, *filename;
670 ARCH64_DECL (arch64);
672 /* This ldi structure was allocated using alloca() in
673 xcoff_relocate_symtab(). Now we need to have persistent object
674 and member names, so we should save them. */
676 filename = LDI_FILENAME (ldi, arch64);
677 mem = filename + strlen (filename) + 1;
678 mem = savestring (mem, strlen (mem));
679 objname = savestring (filename, strlen (filename));
681 fd = LDI_FD (ldi, arch64);
683 /* Note that this opens it once for every member; a possible
684 enhancement would be to only open it once for every object. */
685 abfd = bfd_openr (objname, gnutarget);
687 abfd = bfd_fdopenr (objname, gnutarget, fd);
690 warning ("Could not open `%s' as an executable file: %s",
691 objname, bfd_errmsg (bfd_get_error ()));
695 /* make sure we have an object file */
697 if (bfd_check_format (abfd, bfd_object))
698 vp = map_vmap (abfd, 0);
700 else if (bfd_check_format (abfd, bfd_archive))
703 /* FIXME??? am I tossing BFDs? bfd? */
704 while ((last = bfd_openr_next_archived_file (abfd, last)))
705 if (STREQ (mem, last->filename))
710 warning ("\"%s\": member \"%s\" missing.", objname, mem);
715 if (!bfd_check_format (last, bfd_object))
717 warning ("\"%s\": member \"%s\" not in executable format: %s.",
718 objname, mem, bfd_errmsg (bfd_get_error ()));
724 vp = map_vmap (last, abfd);
728 warning ("\"%s\": not in executable format: %s.",
729 objname, bfd_errmsg (bfd_get_error ()));
733 obj = allocate_objfile (vp->bfd, 0);
736 /* Always add symbols for the main objfile. */
737 if (vp == vmap || auto_solib_add)
738 vmap_add_symbols (vp);
742 /* update VMAP info with ldinfo() information
743 Input is ptr to ldinfo() results. */
746 vmap_ldinfo (LdInfo *ldi)
749 register struct vmap *vp;
750 int got_one, retried;
751 int got_exec_file = 0;
753 int arch64 = ARCH64 ();
755 /* For each *ldi, see if we have a corresponding *vp.
756 If so, update the mapping, and symbol table.
757 If not, add an entry and symbol table. */
761 char *name = LDI_FILENAME (ldi, arch64);
762 char *memb = name + strlen (name) + 1;
763 int fd = LDI_FD (ldi, arch64);
767 if (fstat (fd, &ii) < 0)
769 /* The kernel sets ld_info to -1, if the process is still using the
770 object, and the object is removed. Keep the symbol info for the
771 removed object and issue a warning. */
772 warning ("%s (fd=%d) has disappeared, keeping its symbols",
777 for (got_one = 0, vp = vmap; vp; vp = vp->nxt)
779 struct objfile *objfile;
781 /* First try to find a `vp', which is the same as in ldinfo.
782 If not the same, just continue and grep the next `vp'. If same,
783 relocate its tstart, tend, dstart, dend values. If no such `vp'
784 found, get out of this for loop, add this ldi entry as a new vmap
785 (add_vmap) and come back, find its `vp' and so on... */
787 /* The filenames are not always sufficient to match on. */
789 if ((name[0] == '/' && !STREQ (name, vp->name))
790 || (memb[0] && !STREQ (memb, vp->member)))
793 /* See if we are referring to the same file.
794 We have to check objfile->obfd, symfile.c:reread_symbols might
795 have updated the obfd after a change. */
796 objfile = vp->objfile == NULL ? symfile_objfile : vp->objfile;
798 || objfile->obfd == NULL
799 || bfd_stat (objfile->obfd, &vi) < 0)
801 warning ("Unable to stat %s, keeping its symbols", name);
805 if (ii.st_dev != vi.st_dev || ii.st_ino != vi.st_ino)
813 /* Found a corresponding VMAP. Remap! */
815 vmap_secs (vp, ldi, arch64);
817 /* The objfile is only NULL for the exec file. */
818 if (vp->objfile == NULL)
821 /* relocate symbol table(s). */
824 /* There may be more, so we don't break out of the loop. */
827 /* if there was no matching *vp, we must perforce create the sucker(s) */
828 if (!got_one && !retried)
835 while ((next = LDI_NEXT (ldi, arch64))
836 && (ldi = (void *) (next + (char *) ldi)));
838 /* If we don't find the symfile_objfile anywhere in the ldinfo, it
839 is unlikely that the symbol file is relocated to the proper
840 address. And we might have attached to a process which is
841 running a different copy of the same executable. */
842 if (symfile_objfile != NULL && !got_exec_file)
845 fputs_unfiltered ("Symbol file ", gdb_stderr);
846 fputs_unfiltered (symfile_objfile->name, gdb_stderr);
847 fputs_unfiltered ("\nis not mapped; discarding it.\n\
848 If in fact that file has symbols which the mapped files listed by\n\
849 \"info files\" lack, you can load symbols with the \"symbol-file\" or\n\
850 \"add-symbol-file\" commands (note that you must take care of relocating\n\
851 symbols to the proper address).\n", gdb_stderr);
852 free_objfile (symfile_objfile);
853 symfile_objfile = NULL;
855 breakpoint_re_set ();
858 /* As well as symbol tables, exec_sections need relocation. After
859 the inferior process' termination, there will be a relocated symbol
860 table exist with no corresponding inferior process. At that time, we
861 need to use `exec' bfd, rather than the inferior process's memory space
864 `exec_sections' need to be relocated only once, as long as the exec
865 file remains unchanged.
874 if (execbfd == exec_bfd)
879 if (!vmap || !exec_ops.to_sections)
880 error ("vmap_exec: vmap or exec_ops.to_sections == 0\n");
882 for (i = 0; &exec_ops.to_sections[i] < exec_ops.to_sections_end; i++)
884 if (STREQ (".text", exec_ops.to_sections[i].the_bfd_section->name))
886 exec_ops.to_sections[i].addr += vmap->tstart - vmap->tvma;
887 exec_ops.to_sections[i].endaddr += vmap->tstart - vmap->tvma;
889 else if (STREQ (".data", exec_ops.to_sections[i].the_bfd_section->name))
891 exec_ops.to_sections[i].addr += vmap->dstart - vmap->dvma;
892 exec_ops.to_sections[i].endaddr += vmap->dstart - vmap->dvma;
894 else if (STREQ (".bss", exec_ops.to_sections[i].the_bfd_section->name))
896 exec_ops.to_sections[i].addr += vmap->dstart - vmap->dvma;
897 exec_ops.to_sections[i].endaddr += vmap->dstart - vmap->dvma;
902 /* Set the current architecture from the host running GDB. Called when
903 starting a child process. */
906 set_host_arch (int pid)
908 enum bfd_architecture arch;
911 struct gdbarch_info info;
915 arch = bfd_arch_rs6000;
916 mach = bfd_mach_rs6k;
920 arch = bfd_arch_powerpc;
923 bfd_default_set_arch_mach (&abfd, arch, mach);
925 memset (&info, 0, sizeof info);
926 info.bfd_arch_info = bfd_get_arch_info (&abfd);
928 if (!gdbarch_update_p (info))
930 internal_error ("set_host_arch: failed to select architecture");
935 /* xcoff_relocate_symtab - hook for symbol table relocation.
936 also reads shared libraries.. */
939 xcoff_relocate_symtab (unsigned int pid)
941 int load_segs = 64; /* number of load segments */
944 int arch64 = ARCH64 ();
945 int ldisize = arch64 ? sizeof (ldi->l64) : sizeof (ldi->l32);
950 size = load_segs * ldisize;
951 ldi = (void *) xrealloc (ldi, size);
954 /* According to my humble theory, AIX has some timing problems and
955 when the user stack grows, kernel doesn't update stack info in time
956 and ptrace calls step on user stack. That is why we sleep here a
957 little, and give kernel to update its internals. */
962 rc = ptrace64 (PT_LDINFO, pid, (unsigned long) ldi, size, NULL);
964 rc = ptrace32 (PT_LDINFO, pid, (int *) ldi, size, NULL);
971 perror_with_name ("ptrace ldinfo");
976 vmap_exec (); /* relocate the exec and core sections as well. */
983 /* Core file stuff. */
985 /* Relocate symtabs and read in shared library info, based on symbols
986 from the core file. */
989 xcoff_relocate_core (struct target_ops *target)
995 int arch64 = ARCH64 ();
997 /* Size of a struct ld_info except for the variable-length filename. */
998 int nonfilesz = (int)LDI_FILENAME ((LdInfo *)0, arch64);
1000 /* Allocated size of buffer. */
1001 int buffer_size = nonfilesz;
1002 char *buffer = xmalloc (buffer_size);
1003 struct cleanup *old = make_cleanup (free_current_contents, &buffer);
1005 ldinfo_sec = bfd_get_section_by_name (core_bfd, ".ldinfo");
1006 if (ldinfo_sec == NULL)
1009 fprintf_filtered (gdb_stderr, "Couldn't get ldinfo from core file: %s\n",
1010 bfd_errmsg (bfd_get_error ()));
1017 int names_found = 0;
1019 /* Read in everything but the name. */
1020 if (bfd_get_section_contents (core_bfd, ldinfo_sec, buffer,
1021 offset, nonfilesz) == 0)
1028 if (i == buffer_size)
1031 buffer = xrealloc (buffer, buffer_size);
1033 if (bfd_get_section_contents (core_bfd, ldinfo_sec, &buffer[i],
1034 offset + i, 1) == 0)
1036 if (buffer[i++] == '\0')
1039 while (names_found < 2);
1041 ldi = (LdInfo *) buffer;
1043 /* Can't use a file descriptor from the core file; need to open it. */
1045 ldi->l64.ldinfo_fd = -1;
1047 ldi->l32.ldinfo_fd = -1;
1049 /* The first ldinfo is for the exec file, allocated elsewhere. */
1050 if (offset == 0 && vmap != NULL)
1053 vp = add_vmap (ldi);
1055 /* Process next shared library upon error. */
1056 offset += LDI_NEXT (ldi, arch64);
1060 vmap_secs (vp, ldi, arch64);
1062 /* Unless this is the exec file,
1063 add our sections to the section table for the core target. */
1066 struct section_table *stp;
1068 target_resize_to_sections (target, 2);
1069 stp = target->to_sections_end - 2;
1072 stp->the_bfd_section = bfd_get_section_by_name (stp->bfd, ".text");
1073 stp->addr = vp->tstart;
1074 stp->endaddr = vp->tend;
1078 stp->the_bfd_section = bfd_get_section_by_name (stp->bfd, ".data");
1079 stp->addr = vp->dstart;
1080 stp->endaddr = vp->dend;
1085 while (LDI_NEXT (ldi, arch64) != 0);
1087 breakpoint_re_set ();
1092 kernel_u_size (void)
1094 return (sizeof (struct user));
1097 /* Under AIX, we have to pass the correct TOC pointer to a function
1098 when calling functions in the inferior.
1099 We try to find the relative toc offset of the objfile containing PC
1100 and add the current load address of the data segment from the vmap. */
1103 find_toc_address (CORE_ADDR pc)
1106 extern CORE_ADDR get_toc_offset (struct objfile *); /* xcoffread.c */
1108 for (vp = vmap; vp; vp = vp->nxt)
1110 if (pc >= vp->tstart && pc < vp->tend)
1112 /* vp->objfile is only NULL for the exec file. */
1113 return vp->dstart + get_toc_offset (vp->objfile == NULL
1118 error ("Unable to find TOC entry for pc 0x%x\n", pc);
1121 /* Register that we are able to handle rs6000 core file formats. */
1123 static struct core_fns rs6000_core_fns =
1125 bfd_target_xcoff_flavour, /* core_flavour */
1126 default_check_format, /* check_format */
1127 default_core_sniffer, /* core_sniffer */
1128 fetch_core_registers, /* core_read_registers */
1133 _initialize_core_rs6000 (void)
1135 /* Initialize hook in rs6000-tdep.c for determining the TOC address when
1136 calling functions in the inferior. */
1137 rs6000_find_toc_address_hook = find_toc_address;
1139 /* Initialize hook in rs6000-tdep.c to set the current architecture when
1140 starting a child process. */
1141 rs6000_set_host_arch_hook = set_host_arch;
1143 add_core_fns (&rs6000_core_fns);