1 /* IBM RS/6000 native-dependent code for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1994, 1995, 1996
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, Boston, MA 02111-1307, USA. */
25 #include "xcoffsolib.h"
28 #include "libbfd.h" /* For bfd_cache_lookup (FIXME) */
30 #include "gdb-stabs.h"
32 #include <sys/ptrace.h>
35 #include <sys/param.h>
39 #include <sys/ioctl.h>
50 extern struct vmap * map_vmap PARAMS ((bfd *bf, bfd *arch));
52 extern struct target_ops exec_ops;
55 exec_one_dummy_insn PARAMS ((void));
58 add_text_to_loadinfo PARAMS ((CORE_ADDR textaddr, CORE_ADDR dataaddr));
61 fixup_breakpoints PARAMS ((CORE_ADDR low, CORE_ADDR high, CORE_ADDR delta));
63 /* Conversion from gdb-to-system special purpose register numbers.. */
65 static int special_regs[] = {
76 fetch_inferior_registers (regno)
80 extern char registers[];
82 if (regno < 0) { /* for all registers */
84 /* read 32 general purpose registers. */
86 for (ii=0; ii < 32; ++ii)
87 *(int*)®isters[REGISTER_BYTE (ii)] =
88 ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) ii, 0, 0);
90 /* read general purpose floating point registers. */
92 for (ii=0; ii < 32; ++ii)
93 ptrace (PT_READ_FPR, inferior_pid,
94 (PTRACE_ARG3_TYPE) ®isters [REGISTER_BYTE (FP0_REGNUM+ii)],
97 /* read special registers. */
98 for (ii=0; ii <= LAST_SP_REGNUM-FIRST_SP_REGNUM; ++ii)
99 *(int*)®isters[REGISTER_BYTE (FIRST_SP_REGNUM+ii)] =
100 ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) special_regs[ii],
103 registers_fetched ();
107 /* else an individual register is addressed. */
109 else if (regno < FP0_REGNUM) { /* a GPR */
110 *(int*)®isters[REGISTER_BYTE (regno)] =
111 ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) regno, 0, 0);
113 else if (regno <= FPLAST_REGNUM) { /* a FPR */
114 ptrace (PT_READ_FPR, inferior_pid,
115 (PTRACE_ARG3_TYPE) ®isters [REGISTER_BYTE (regno)],
116 (regno-FP0_REGNUM+FPR0), 0);
118 else if (regno <= LAST_SP_REGNUM) { /* a special register */
119 *(int*)®isters[REGISTER_BYTE (regno)] =
120 ptrace (PT_READ_GPR, inferior_pid,
121 (PTRACE_ARG3_TYPE) special_regs[regno-FIRST_SP_REGNUM], 0, 0);
124 fprintf_unfiltered (gdb_stderr, "gdb error: register no %d not implemented.\n", regno);
126 register_valid [regno] = 1;
129 /* Store our register values back into the inferior.
130 If REGNO is -1, do this for all registers.
131 Otherwise, REGNO specifies which register (so we can save time). */
134 store_inferior_registers (regno)
137 extern char registers[];
142 { /* for all registers.. */
145 /* execute one dummy instruction (which is a breakpoint) in inferior
146 process. So give kernel a chance to do internal house keeping.
147 Otherwise the following ptrace(2) calls will mess up user stack
148 since kernel will get confused about the bottom of the stack (%sp) */
150 exec_one_dummy_insn ();
152 /* write general purpose registers first! */
153 for ( ii=GPR0; ii<=GPR31; ++ii)
155 ptrace (PT_WRITE_GPR, inferior_pid, (PTRACE_ARG3_TYPE) ii,
156 *(int*)®isters[REGISTER_BYTE (ii)], 0);
159 perror ("ptrace write_gpr");
164 /* write floating point registers now. */
165 for ( ii=0; ii < 32; ++ii)
167 ptrace (PT_WRITE_FPR, inferior_pid,
168 (PTRACE_ARG3_TYPE) ®isters[REGISTER_BYTE (FP0_REGNUM+ii)],
172 perror ("ptrace write_fpr");
177 /* write special registers. */
178 for (ii=0; ii <= LAST_SP_REGNUM-FIRST_SP_REGNUM; ++ii)
180 ptrace (PT_WRITE_GPR, inferior_pid,
181 (PTRACE_ARG3_TYPE) special_regs[ii],
182 *(int*)®isters[REGISTER_BYTE (FIRST_SP_REGNUM+ii)], 0);
185 perror ("ptrace write_gpr");
191 /* else, a specific register number is given... */
193 else if (regno < FP0_REGNUM) /* a GPR */
195 ptrace (PT_WRITE_GPR, inferior_pid, (PTRACE_ARG3_TYPE) regno,
196 *(int*)®isters[REGISTER_BYTE (regno)], 0);
199 else if (regno <= FPLAST_REGNUM) /* a FPR */
201 ptrace (PT_WRITE_FPR, inferior_pid,
202 (PTRACE_ARG3_TYPE) ®isters[REGISTER_BYTE (regno)],
203 regno - FP0_REGNUM + FPR0, 0);
206 else if (regno <= LAST_SP_REGNUM) /* a special register */
208 ptrace (PT_WRITE_GPR, inferior_pid,
209 (PTRACE_ARG3_TYPE) special_regs [regno-FIRST_SP_REGNUM],
210 *(int*)®isters[REGISTER_BYTE (regno)], 0);
214 fprintf_unfiltered (gdb_stderr, "Gdb error: register no %d not implemented.\n", regno);
218 perror ("ptrace write");
223 /* Execute one dummy breakpoint instruction. This way we give the kernel
224 a chance to do some housekeeping and update inferior's internal data,
228 exec_one_dummy_insn ()
230 #define DUMMY_INSN_ADDR (TEXT_SEGMENT_BASE)+0x200
232 char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */
233 unsigned int status, pid;
235 /* We plant one dummy breakpoint into DUMMY_INSN_ADDR address. We assume that
236 this address will never be executed again by the real code. */
238 target_insert_breakpoint (DUMMY_INSN_ADDR, shadow_contents);
242 /* You might think this could be done with a single ptrace call, and
243 you'd be correct for just about every platform I've ever worked
244 on. However, rs6000-ibm-aix4.1.3 seems to have screwed this up --
245 the inferior never hits the breakpoint (it's also worth noting
246 powerpc-ibm-aix4.1.3 works correctly). */
247 write_pc (DUMMY_INSN_ADDR);
248 ptrace (PT_CONTINUE, inferior_pid, (PTRACE_ARG3_TYPE)1, 0, 0);
251 perror ("pt_continue");
254 pid = wait (&status);
255 } while (pid != inferior_pid);
257 target_remove_breakpoint (DUMMY_INSN_ADDR, shadow_contents);
261 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
263 unsigned core_reg_size;
265 unsigned int reg_addr; /* Unused in this version */
267 /* fetch GPRs and special registers from the first register section
271 /* copy GPRs first. */
272 memcpy (registers, core_reg_sect, 32 * 4);
274 /* gdb's internal register template and bfd's register section layout
275 should share a common include file. FIXMEmgo */
276 /* then comes special registes. They are supposed to be in the same
277 order in gdb template and bfd `.reg' section. */
278 core_reg_sect += (32 * 4);
279 memcpy (®isters [REGISTER_BYTE (FIRST_SP_REGNUM)], core_reg_sect,
280 (LAST_SP_REGNUM - FIRST_SP_REGNUM + 1) * 4);
283 /* fetch floating point registers from register section 2 in core bfd. */
285 memcpy (®isters [REGISTER_BYTE (FP0_REGNUM)], core_reg_sect, 32 * 8);
288 fprintf_unfiltered (gdb_stderr, "Gdb error: unknown parameter to fetch_core_registers().\n");
291 /* handle symbol translation on vmapping */
295 register struct vmap *vp;
297 register struct objfile *objfile;
298 CORE_ADDR text_delta;
299 CORE_ADDR data_delta;
301 struct section_offsets *new_offsets;
304 objfile = vp->objfile;
307 /* OK, it's not an objfile we opened ourselves.
308 Currently, that can only happen with the exec file, so
309 relocate the symbols for the symfile. */
310 if (symfile_objfile == NULL)
312 objfile = symfile_objfile;
316 (sizeof (struct section_offsets)
317 + sizeof (new_offsets->offsets) * objfile->num_sections);
319 for (i = 0; i < objfile->num_sections; ++i)
320 ANOFFSET (new_offsets, i) = ANOFFSET (objfile->section_offsets, i);
323 vp->tstart - ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT);
324 ANOFFSET (new_offsets, SECT_OFF_TEXT) = vp->tstart;
327 vp->dstart - ANOFFSET (objfile->section_offsets, SECT_OFF_DATA);
328 ANOFFSET (new_offsets, SECT_OFF_DATA) = vp->dstart;
331 vp->dstart - ANOFFSET (objfile->section_offsets, SECT_OFF_BSS);
332 ANOFFSET (new_offsets, SECT_OFF_BSS) = vp->dstart;
334 objfile_relocate (objfile, new_offsets);
337 /* Add symbols for an objfile. */
340 objfile_symbol_add (arg)
343 struct objfile *obj = (struct objfile *) arg;
345 syms_from_objfile (obj, 0, 0, 0);
346 new_symfile_objfile (obj, 0, 0);
350 /* Add a new vmap entry based on ldinfo() information.
352 If ldi->ldinfo_fd is not valid (e.g. this struct ld_info is from a
353 core file), the caller should set it to -1, and we will open the file.
355 Return the vmap new entry. */
359 register struct ld_info *ldi;
362 register char *mem, *objname;
366 /* This ldi structure was allocated using alloca() in
367 xcoff_relocate_symtab(). Now we need to have persistent object
368 and member names, so we should save them. */
370 mem = ldi->ldinfo_filename + strlen (ldi->ldinfo_filename) + 1;
371 mem = savestring (mem, strlen (mem));
372 objname = savestring (ldi->ldinfo_filename, strlen (ldi->ldinfo_filename));
374 if (ldi->ldinfo_fd < 0)
375 /* Note that this opens it once for every member; a possible
376 enhancement would be to only open it once for every object. */
377 abfd = bfd_openr (objname, gnutarget);
379 abfd = bfd_fdopenr (objname, gnutarget, ldi->ldinfo_fd);
381 error ("Could not open `%s' as an executable file: %s",
382 objname, bfd_errmsg (bfd_get_error ()));
384 /* make sure we have an object file */
386 if (bfd_check_format (abfd, bfd_object))
387 vp = map_vmap (abfd, 0);
389 else if (bfd_check_format (abfd, bfd_archive))
392 /* FIXME??? am I tossing BFDs? bfd? */
393 while ((last = bfd_openr_next_archived_file (abfd, last)))
394 if (STREQ (mem, last->filename))
400 /* FIXME -- should be error */
401 warning ("\"%s\": member \"%s\" missing.", abfd->filename, mem);
405 if (!bfd_check_format(last, bfd_object))
407 bfd_close (last); /* XXX??? */
411 vp = map_vmap (last, abfd);
417 error ("\"%s\": not in executable format: %s.",
418 objname, bfd_errmsg (bfd_get_error ()));
421 obj = allocate_objfile (vp->bfd, 0);
424 #ifndef SOLIB_SYMBOLS_MANUAL
425 if (catch_errors (objfile_symbol_add, (char *)obj,
426 "Error while reading shared library symbols:\n",
429 /* Note this is only done if symbol reading was successful. */
437 /* update VMAP info with ldinfo() information
438 Input is ptr to ldinfo() results. */
442 register struct ld_info *ldi;
445 register struct vmap *vp;
446 int got_one, retried;
449 /* For each *ldi, see if we have a corresponding *vp.
450 If so, update the mapping, and symbol table.
451 If not, add an entry and symbol table. */
454 char *name = ldi->ldinfo_filename;
455 char *memb = name + strlen(name) + 1;
459 if (fstat (ldi->ldinfo_fd, &ii) < 0)
460 fatal ("cannot fstat(fd=%d) on %s", ldi->ldinfo_fd, name);
462 for (got_one = 0, vp = vmap; vp; vp = vp->nxt)
464 /* First try to find a `vp', which is the same as in ldinfo.
465 If not the same, just continue and grep the next `vp'. If same,
466 relocate its tstart, tend, dstart, dend values. If no such `vp'
467 found, get out of this for loop, add this ldi entry as a new vmap
468 (add_vmap) and come back, fins its `vp' and so on... */
470 /* The filenames are not always sufficient to match on. */
472 if ((name[0] == '/' && !STREQ(name, vp->name))
473 || (memb[0] && !STREQ(memb, vp->member)))
476 /* See if we are referring to the same file. */
477 if (bfd_stat (vp->bfd, &vi) < 0)
478 /* An error here is innocuous, most likely meaning that
479 the file descriptor has become worthless.
480 FIXME: What does it mean for a file descriptor to become
481 "worthless"? What makes it happen? What error does it
482 produce (ENOENT? others?)? Should we at least provide
486 if (ii.st_dev != vi.st_dev || ii.st_ino != vi.st_ino)
490 close (ldi->ldinfo_fd);
494 /* Found a corresponding VMAP. Remap! */
496 /* We can assume pointer == CORE_ADDR, this code is native only. */
497 vp->tstart = (CORE_ADDR) ldi->ldinfo_textorg;
498 vp->tend = vp->tstart + ldi->ldinfo_textsize;
499 vp->dstart = (CORE_ADDR) ldi->ldinfo_dataorg;
500 vp->dend = vp->dstart + ldi->ldinfo_datasize;
504 vp->tstart += vp->tadj;
505 vp->tend += vp->tadj;
508 /* The objfile is only NULL for the exec file. */
509 if (vp->objfile == NULL)
512 #ifdef DONT_RELOCATE_SYMFILE_OBJFILE
513 if (vp->objfile == symfile_objfile
514 || vp->objfile == NULL)
516 ldi->ldinfo_dataorg = 0;
517 vp->dstart = (CORE_ADDR) 0;
518 vp->dend = ldi->ldinfo_datasize;
522 /* relocate symbol table(s). */
525 /* There may be more, so we don't break out of the loop. */
528 /* if there was no matching *vp, we must perforce create the sucker(s) */
529 if (!got_one && !retried)
535 } while (ldi->ldinfo_next
536 && (ldi = (void *) (ldi->ldinfo_next + (char *) ldi)));
538 /* If we don't find the symfile_objfile anywhere in the ldinfo, it
539 is unlikely that the symbol file is relocated to the proper
540 address. And we might have attached to a process which is
541 running a different copy of the same executable. */
542 if (symfile_objfile != NULL && !got_exec_file)
545 fputs_unfiltered ("Symbol file ", gdb_stderr);
546 fputs_unfiltered (symfile_objfile->name, gdb_stderr);
547 fputs_unfiltered ("\nis not mapped; discarding it.\n\
548 If in fact that file has symbols which the mapped files listed by\n\
549 \"info files\" lack, you can load symbols with the \"symbol-file\" or\n\
550 \"add-symbol-file\" commands (note that you must take care of relocating\n\
551 symbols to the proper address).\n", gdb_stderr);
552 free_objfile (symfile_objfile);
553 symfile_objfile = NULL;
555 breakpoint_re_set ();
558 /* As well as symbol tables, exec_sections need relocation. After
559 the inferior process' termination, there will be a relocated symbol
560 table exist with no corresponding inferior process. At that time, we
561 need to use `exec' bfd, rather than the inferior process's memory space
564 `exec_sections' need to be relocated only once, as long as the exec
565 file remains unchanged.
574 if (execbfd == exec_bfd)
579 if (!vmap || !exec_ops.to_sections)
580 error ("vmap_exec: vmap or exec_ops.to_sections == 0\n");
582 for (i=0; &exec_ops.to_sections[i] < exec_ops.to_sections_end; i++)
584 if (STREQ(".text", exec_ops.to_sections[i].the_bfd_section->name))
586 exec_ops.to_sections[i].addr += vmap->tstart;
587 exec_ops.to_sections[i].endaddr += vmap->tstart;
589 else if (STREQ(".data", exec_ops.to_sections[i].the_bfd_section->name))
591 exec_ops.to_sections[i].addr += vmap->dstart;
592 exec_ops.to_sections[i].endaddr += vmap->dstart;
597 /* xcoff_relocate_symtab - hook for symbol table relocation.
598 also reads shared libraries.. */
601 xcoff_relocate_symtab (pid)
604 #define MAX_LOAD_SEGS 64 /* maximum number of load segments */
608 ldi = (void *) alloca(MAX_LOAD_SEGS * sizeof (*ldi));
610 /* According to my humble theory, AIX has some timing problems and
611 when the user stack grows, kernel doesn't update stack info in time
612 and ptrace calls step on user stack. That is why we sleep here a little,
613 and give kernel to update its internals. */
618 ptrace (PT_LDINFO, pid, (PTRACE_ARG3_TYPE) ldi,
619 MAX_LOAD_SEGS * sizeof(*ldi), ldi);
621 perror_with_name ("ptrace ldinfo");
626 /* We are allowed to assume CORE_ADDR == pointer. This code is
628 add_text_to_loadinfo ((CORE_ADDR) ldi->ldinfo_textorg,
629 (CORE_ADDR) ldi->ldinfo_dataorg);
630 } while (ldi->ldinfo_next
631 && (ldi = (void *) (ldi->ldinfo_next + (char *) ldi)));
634 /* Now that we've jumbled things around, re-sort them. */
635 sort_minimal_symbols ();
638 /* relocate the exec and core sections as well. */
642 /* Core file stuff. */
644 /* Relocate symtabs and read in shared library info, based on symbols
645 from the core file. */
648 xcoff_relocate_core (target)
649 struct target_ops *target;
651 /* Offset of member MEMBER in a struct of type TYPE. */
653 #define offsetof(TYPE, MEMBER) ((int) &((TYPE *)0)->MEMBER)
656 /* Size of a struct ld_info except for the variable-length filename. */
657 #define LDINFO_SIZE (offsetof (struct ld_info, ldinfo_filename))
661 struct ld_info *ldip;
664 /* Allocated size of buffer. */
665 int buffer_size = LDINFO_SIZE;
666 char *buffer = xmalloc (buffer_size);
667 struct cleanup *old = make_cleanup (free_current_contents, &buffer);
669 /* FIXME, this restriction should not exist. For now, though I'll
670 avoid coredumps with error() pending a real fix. */
673 ("Can't debug a core file without an executable file (on the RS/6000)");
675 ldinfo_sec = bfd_get_section_by_name (core_bfd, ".ldinfo");
676 if (ldinfo_sec == NULL)
679 fprintf_filtered (gdb_stderr, "Couldn't get ldinfo from core file: %s\n",
680 bfd_errmsg (bfd_get_error ()));
689 /* Read in everything but the name. */
690 if (bfd_get_section_contents (core_bfd, ldinfo_sec, buffer,
691 offset, LDINFO_SIZE) == 0)
698 if (i == buffer_size)
701 buffer = xrealloc (buffer, buffer_size);
703 if (bfd_get_section_contents (core_bfd, ldinfo_sec, &buffer[i],
706 if (buffer[i++] == '\0')
708 } while (names_found < 2);
710 ldip = (struct ld_info *) buffer;
712 /* Can't use a file descriptor from the core file; need to open it. */
713 ldip->ldinfo_fd = -1;
715 /* The first ldinfo is for the exec file, allocated elsewhere. */
719 vp = add_vmap (ldip);
721 offset += ldip->ldinfo_next;
723 /* We can assume pointer == CORE_ADDR, this code is native only. */
724 vp->tstart = (CORE_ADDR) ldip->ldinfo_textorg;
725 vp->tend = vp->tstart + ldip->ldinfo_textsize;
726 vp->dstart = (CORE_ADDR) ldip->ldinfo_dataorg;
727 vp->dend = vp->dstart + ldip->ldinfo_datasize;
729 #ifdef DONT_RELOCATE_SYMFILE_OBJFILE
732 vp->dstart = (CORE_ADDR) 0;
733 vp->dend = ldip->ldinfo_datasize;
739 vp->tstart += vp->tadj;
740 vp->tend += vp->tadj;
743 /* Unless this is the exec file,
744 add our sections to the section table for the core target. */
748 struct section_table *stp;
751 /* We must update the to_sections field in the core_ops structure
752 now to avoid dangling pointer dereferences. */
753 update_coreops = core_ops.to_sections == target->to_sections;
755 count = target->to_sections_end - target->to_sections;
757 target->to_sections = (struct section_table *)
758 xrealloc (target->to_sections,
759 sizeof (struct section_table) * count);
760 target->to_sections_end = target->to_sections + count;
762 /* Update the to_sections field in the core_ops structure
766 core_ops.to_sections = target->to_sections;
767 core_ops.to_sections_end = target->to_sections_end;
769 stp = target->to_sections_end - 2;
771 /* "Why do we add bfd_section_vma?", I hear you cry.
772 Well, the start of the section in the file is actually
773 that far into the section as the struct vmap understands it.
774 So for text sections, bfd_section_vma tends to be 0x200,
775 and if vp->tstart is 0xd0002000, then the first byte of
776 the text section on disk corresponds to address 0xd0002200. */
778 stp->the_bfd_section = bfd_get_section_by_name (stp->bfd, ".text");
779 stp->addr = bfd_section_vma (stp->bfd, stp->the_bfd_section) + vp->tstart;
780 stp->endaddr = bfd_section_vma (stp->bfd, stp->the_bfd_section) + vp->tend;
784 stp->the_bfd_section = bfd_get_section_by_name (stp->bfd, ".data");
785 stp->addr = bfd_section_vma (stp->bfd, stp->the_bfd_section) + vp->dstart;
786 stp->endaddr = bfd_section_vma (stp->bfd, stp->the_bfd_section) + vp->dend;
791 add_text_to_loadinfo ((CORE_ADDR)ldip->ldinfo_textorg,
792 (CORE_ADDR)ldip->ldinfo_dataorg);
793 } while (ldip->ldinfo_next != 0);
795 breakpoint_re_set ();
802 return (sizeof (struct user));
806 /* Register that we are able to handle rs6000 core file formats. */
808 static struct core_fns rs6000_core_fns =
810 bfd_target_coff_flavour,
811 fetch_core_registers,
816 _initialize_core_rs6000 ()
818 add_core_fns (&rs6000_core_fns);