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 vmap_exec PARAMS ((void));
58 vmap_ldinfo PARAMS ((struct ld_info *));
61 add_vmap PARAMS ((struct ld_info *));
64 objfile_symbol_add PARAMS ((char *));
67 vmap_symtab PARAMS ((struct vmap *));
70 fetch_core_registers PARAMS ((char *, unsigned int, int, unsigned int));
73 exec_one_dummy_insn PARAMS ((void));
76 add_text_to_loadinfo PARAMS ((CORE_ADDR textaddr, CORE_ADDR dataaddr));
79 fixup_breakpoints PARAMS ((CORE_ADDR low, CORE_ADDR high, CORE_ADDR delta));
81 /* Conversion from gdb-to-system special purpose register numbers.. */
83 static int special_regs[] = {
94 fetch_inferior_registers (regno)
98 extern char registers[];
100 if (regno < 0) { /* for all registers */
102 /* read 32 general purpose registers. */
104 for (ii=0; ii < 32; ++ii)
105 *(int*)®isters[REGISTER_BYTE (ii)] =
106 ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) ii, 0, 0);
108 /* read general purpose floating point registers. */
110 for (ii=0; ii < 32; ++ii)
111 ptrace (PT_READ_FPR, inferior_pid,
112 (PTRACE_ARG3_TYPE) ®isters [REGISTER_BYTE (FP0_REGNUM+ii)],
115 /* read special registers. */
116 for (ii=0; ii <= LAST_SP_REGNUM-FIRST_SP_REGNUM; ++ii)
117 *(int*)®isters[REGISTER_BYTE (FIRST_SP_REGNUM+ii)] =
118 ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) special_regs[ii],
121 registers_fetched ();
125 /* else an individual register is addressed. */
127 else if (regno < FP0_REGNUM) { /* a GPR */
128 *(int*)®isters[REGISTER_BYTE (regno)] =
129 ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) regno, 0, 0);
131 else if (regno <= FPLAST_REGNUM) { /* a FPR */
132 ptrace (PT_READ_FPR, inferior_pid,
133 (PTRACE_ARG3_TYPE) ®isters [REGISTER_BYTE (regno)],
134 (regno-FP0_REGNUM+FPR0), 0);
136 else if (regno <= LAST_SP_REGNUM) { /* a special register */
137 *(int*)®isters[REGISTER_BYTE (regno)] =
138 ptrace (PT_READ_GPR, inferior_pid,
139 (PTRACE_ARG3_TYPE) special_regs[regno-FIRST_SP_REGNUM], 0, 0);
142 fprintf_unfiltered (gdb_stderr, "gdb error: register no %d not implemented.\n", regno);
144 register_valid [regno] = 1;
147 /* Store our register values back into the inferior.
148 If REGNO is -1, do this for all registers.
149 Otherwise, REGNO specifies which register (so we can save time). */
152 store_inferior_registers (regno)
155 extern char registers[];
160 { /* for all registers.. */
163 /* execute one dummy instruction (which is a breakpoint) in inferior
164 process. So give kernel a chance to do internal house keeping.
165 Otherwise the following ptrace(2) calls will mess up user stack
166 since kernel will get confused about the bottom of the stack (%sp) */
168 exec_one_dummy_insn ();
170 /* write general purpose registers first! */
171 for ( ii=GPR0; ii<=GPR31; ++ii)
173 ptrace (PT_WRITE_GPR, inferior_pid, (PTRACE_ARG3_TYPE) ii,
174 *(int*)®isters[REGISTER_BYTE (ii)], 0);
177 perror ("ptrace write_gpr");
182 /* write floating point registers now. */
183 for ( ii=0; ii < 32; ++ii)
185 ptrace (PT_WRITE_FPR, inferior_pid,
186 (PTRACE_ARG3_TYPE) ®isters[REGISTER_BYTE (FP0_REGNUM+ii)],
190 perror ("ptrace write_fpr");
195 /* write special registers. */
196 for (ii=0; ii <= LAST_SP_REGNUM-FIRST_SP_REGNUM; ++ii)
198 ptrace (PT_WRITE_GPR, inferior_pid,
199 (PTRACE_ARG3_TYPE) special_regs[ii],
200 *(int*)®isters[REGISTER_BYTE (FIRST_SP_REGNUM+ii)], 0);
203 perror ("ptrace write_gpr");
209 /* else, a specific register number is given... */
211 else if (regno < FP0_REGNUM) /* a GPR */
213 ptrace (PT_WRITE_GPR, inferior_pid, (PTRACE_ARG3_TYPE) regno,
214 *(int*)®isters[REGISTER_BYTE (regno)], 0);
217 else if (regno <= FPLAST_REGNUM) /* a FPR */
219 ptrace (PT_WRITE_FPR, inferior_pid,
220 (PTRACE_ARG3_TYPE) ®isters[REGISTER_BYTE (regno)],
221 regno - FP0_REGNUM + FPR0, 0);
224 else if (regno <= LAST_SP_REGNUM) /* a special register */
226 ptrace (PT_WRITE_GPR, inferior_pid,
227 (PTRACE_ARG3_TYPE) special_regs [regno-FIRST_SP_REGNUM],
228 *(int*)®isters[REGISTER_BYTE (regno)], 0);
232 fprintf_unfiltered (gdb_stderr, "Gdb error: register no %d not implemented.\n", regno);
236 perror ("ptrace write");
241 /* Execute one dummy breakpoint instruction. This way we give the kernel
242 a chance to do some housekeeping and update inferior's internal data,
246 exec_one_dummy_insn ()
248 #define DUMMY_INSN_ADDR (TEXT_SEGMENT_BASE)+0x200
250 char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */
251 unsigned int status, pid;
254 /* We plant one dummy breakpoint into DUMMY_INSN_ADDR address. We assume that
255 this address will never be executed again by the real code. */
257 target_insert_breakpoint (DUMMY_INSN_ADDR, shadow_contents);
261 /* You might think this could be done with a single ptrace call, and
262 you'd be correct for just about every platform I've ever worked
263 on. However, rs6000-ibm-aix4.1.3 seems to have screwed this up --
264 the inferior never hits the breakpoint (it's also worth noting
265 powerpc-ibm-aix4.1.3 works correctly). */
266 prev_pc = read_pc ();
267 write_pc (DUMMY_INSN_ADDR);
268 ptrace (PT_CONTINUE, inferior_pid, (PTRACE_ARG3_TYPE)1, 0, 0);
271 perror ("pt_continue");
274 pid = wait (&status);
275 } while (pid != inferior_pid);
278 target_remove_breakpoint (DUMMY_INSN_ADDR, shadow_contents);
282 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
284 unsigned core_reg_size;
286 unsigned int reg_addr; /* Unused in this version */
288 /* fetch GPRs and special registers from the first register section
292 /* copy GPRs first. */
293 memcpy (registers, core_reg_sect, 32 * 4);
295 /* gdb's internal register template and bfd's register section layout
296 should share a common include file. FIXMEmgo */
297 /* then comes special registes. They are supposed to be in the same
298 order in gdb template and bfd `.reg' section. */
299 core_reg_sect += (32 * 4);
300 memcpy (®isters [REGISTER_BYTE (FIRST_SP_REGNUM)], core_reg_sect,
301 (LAST_SP_REGNUM - FIRST_SP_REGNUM + 1) * 4);
304 /* fetch floating point registers from register section 2 in core bfd. */
306 memcpy (®isters [REGISTER_BYTE (FP0_REGNUM)], core_reg_sect, 32 * 8);
309 fprintf_unfiltered (gdb_stderr, "Gdb error: unknown parameter to fetch_core_registers().\n");
312 /* handle symbol translation on vmapping */
316 register struct vmap *vp;
318 register struct objfile *objfile;
319 CORE_ADDR text_delta;
320 CORE_ADDR data_delta;
322 struct section_offsets *new_offsets;
325 objfile = vp->objfile;
328 /* OK, it's not an objfile we opened ourselves.
329 Currently, that can only happen with the exec file, so
330 relocate the symbols for the symfile. */
331 if (symfile_objfile == NULL)
333 objfile = symfile_objfile;
337 (sizeof (struct section_offsets)
338 + sizeof (new_offsets->offsets) * objfile->num_sections);
340 for (i = 0; i < objfile->num_sections; ++i)
341 ANOFFSET (new_offsets, i) = ANOFFSET (objfile->section_offsets, i);
344 vp->tstart - ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT);
345 ANOFFSET (new_offsets, SECT_OFF_TEXT) = vp->tstart;
348 vp->dstart - ANOFFSET (objfile->section_offsets, SECT_OFF_DATA);
349 ANOFFSET (new_offsets, SECT_OFF_DATA) = vp->dstart;
352 vp->dstart - ANOFFSET (objfile->section_offsets, SECT_OFF_BSS);
353 ANOFFSET (new_offsets, SECT_OFF_BSS) = vp->dstart;
355 objfile_relocate (objfile, new_offsets);
358 /* Add symbols for an objfile. */
361 objfile_symbol_add (arg)
364 struct objfile *obj = (struct objfile *) arg;
366 syms_from_objfile (obj, 0, 0, 0);
367 new_symfile_objfile (obj, 0, 0);
371 /* Add a new vmap entry based on ldinfo() information.
373 If ldi->ldinfo_fd is not valid (e.g. this struct ld_info is from a
374 core file), the caller should set it to -1, and we will open the file.
376 Return the vmap new entry. */
380 register struct ld_info *ldi;
383 register char *mem, *objname;
387 /* This ldi structure was allocated using alloca() in
388 xcoff_relocate_symtab(). Now we need to have persistent object
389 and member names, so we should save them. */
391 mem = ldi->ldinfo_filename + strlen (ldi->ldinfo_filename) + 1;
392 mem = savestring (mem, strlen (mem));
393 objname = savestring (ldi->ldinfo_filename, strlen (ldi->ldinfo_filename));
395 if (ldi->ldinfo_fd < 0)
396 /* Note that this opens it once for every member; a possible
397 enhancement would be to only open it once for every object. */
398 abfd = bfd_openr (objname, gnutarget);
400 abfd = bfd_fdopenr (objname, gnutarget, ldi->ldinfo_fd);
402 error ("Could not open `%s' as an executable file: %s",
403 objname, bfd_errmsg (bfd_get_error ()));
405 /* make sure we have an object file */
407 if (bfd_check_format (abfd, bfd_object))
408 vp = map_vmap (abfd, 0);
410 else if (bfd_check_format (abfd, bfd_archive))
413 /* FIXME??? am I tossing BFDs? bfd? */
414 while ((last = bfd_openr_next_archived_file (abfd, last)))
415 if (STREQ (mem, last->filename))
421 /* FIXME -- should be error */
422 warning ("\"%s\": member \"%s\" missing.", abfd->filename, mem);
426 if (!bfd_check_format(last, bfd_object))
428 bfd_close (last); /* XXX??? */
432 vp = map_vmap (last, abfd);
438 error ("\"%s\": not in executable format: %s.",
439 objname, bfd_errmsg (bfd_get_error ()));
442 obj = allocate_objfile (vp->bfd, 0);
445 #ifndef SOLIB_SYMBOLS_MANUAL
446 if (catch_errors (objfile_symbol_add, (char *)obj,
447 "Error while reading shared library symbols:\n",
450 /* Note this is only done if symbol reading was successful. */
458 /* update VMAP info with ldinfo() information
459 Input is ptr to ldinfo() results. */
463 register struct ld_info *ldi;
466 register struct vmap *vp;
467 int got_one, retried;
468 int got_exec_file = 0;
470 /* For each *ldi, see if we have a corresponding *vp.
471 If so, update the mapping, and symbol table.
472 If not, add an entry and symbol table. */
475 char *name = ldi->ldinfo_filename;
476 char *memb = name + strlen(name) + 1;
480 if (fstat (ldi->ldinfo_fd, &ii) < 0)
481 fatal ("cannot fstat(fd=%d) on %s", ldi->ldinfo_fd, name);
483 for (got_one = 0, vp = vmap; vp; vp = vp->nxt)
485 /* First try to find a `vp', which is the same as in ldinfo.
486 If not the same, just continue and grep the next `vp'. If same,
487 relocate its tstart, tend, dstart, dend values. If no such `vp'
488 found, get out of this for loop, add this ldi entry as a new vmap
489 (add_vmap) and come back, fins its `vp' and so on... */
491 /* The filenames are not always sufficient to match on. */
493 if ((name[0] == '/' && !STREQ(name, vp->name))
494 || (memb[0] && !STREQ(memb, vp->member)))
497 /* See if we are referring to the same file. */
498 if (bfd_stat (vp->bfd, &vi) < 0)
499 /* An error here is innocuous, most likely meaning that
500 the file descriptor has become worthless.
501 FIXME: What does it mean for a file descriptor to become
502 "worthless"? What makes it happen? What error does it
503 produce (ENOENT? others?)? Should we at least provide
507 if (ii.st_dev != vi.st_dev || ii.st_ino != vi.st_ino)
511 close (ldi->ldinfo_fd);
515 /* Found a corresponding VMAP. Remap! */
517 /* We can assume pointer == CORE_ADDR, this code is native only. */
518 vp->tstart = (CORE_ADDR) ldi->ldinfo_textorg;
519 vp->tend = vp->tstart + ldi->ldinfo_textsize;
520 vp->dstart = (CORE_ADDR) ldi->ldinfo_dataorg;
521 vp->dend = vp->dstart + ldi->ldinfo_datasize;
525 vp->tstart += vp->tadj;
526 vp->tend += vp->tadj;
529 /* The objfile is only NULL for the exec file. */
530 if (vp->objfile == NULL)
533 #ifdef DONT_RELOCATE_SYMFILE_OBJFILE
534 if (vp->objfile == symfile_objfile
535 || vp->objfile == NULL)
537 ldi->ldinfo_dataorg = 0;
538 vp->dstart = (CORE_ADDR) 0;
539 vp->dend = ldi->ldinfo_datasize;
543 /* relocate symbol table(s). */
546 /* There may be more, so we don't break out of the loop. */
549 /* if there was no matching *vp, we must perforce create the sucker(s) */
550 if (!got_one && !retried)
556 } while (ldi->ldinfo_next
557 && (ldi = (void *) (ldi->ldinfo_next + (char *) ldi)));
559 /* If we don't find the symfile_objfile anywhere in the ldinfo, it
560 is unlikely that the symbol file is relocated to the proper
561 address. And we might have attached to a process which is
562 running a different copy of the same executable. */
563 if (symfile_objfile != NULL && !got_exec_file)
566 fputs_unfiltered ("Symbol file ", gdb_stderr);
567 fputs_unfiltered (symfile_objfile->name, gdb_stderr);
568 fputs_unfiltered ("\nis not mapped; discarding it.\n\
569 If in fact that file has symbols which the mapped files listed by\n\
570 \"info files\" lack, you can load symbols with the \"symbol-file\" or\n\
571 \"add-symbol-file\" commands (note that you must take care of relocating\n\
572 symbols to the proper address).\n", gdb_stderr);
573 free_objfile (symfile_objfile);
574 symfile_objfile = NULL;
576 breakpoint_re_set ();
579 /* As well as symbol tables, exec_sections need relocation. After
580 the inferior process' termination, there will be a relocated symbol
581 table exist with no corresponding inferior process. At that time, we
582 need to use `exec' bfd, rather than the inferior process's memory space
585 `exec_sections' need to be relocated only once, as long as the exec
586 file remains unchanged.
595 if (execbfd == exec_bfd)
600 if (!vmap || !exec_ops.to_sections)
601 error ("vmap_exec: vmap or exec_ops.to_sections == 0\n");
603 for (i=0; &exec_ops.to_sections[i] < exec_ops.to_sections_end; i++)
605 if (STREQ(".text", exec_ops.to_sections[i].the_bfd_section->name))
607 exec_ops.to_sections[i].addr += vmap->tstart;
608 exec_ops.to_sections[i].endaddr += vmap->tstart;
610 else if (STREQ(".data", exec_ops.to_sections[i].the_bfd_section->name))
612 exec_ops.to_sections[i].addr += vmap->dstart;
613 exec_ops.to_sections[i].endaddr += vmap->dstart;
618 /* xcoff_relocate_symtab - hook for symbol table relocation.
619 also reads shared libraries.. */
622 xcoff_relocate_symtab (pid)
625 #define MAX_LOAD_SEGS 64 /* maximum number of load segments */
629 ldi = (void *) alloca(MAX_LOAD_SEGS * sizeof (*ldi));
631 /* According to my humble theory, AIX has some timing problems and
632 when the user stack grows, kernel doesn't update stack info in time
633 and ptrace calls step on user stack. That is why we sleep here a little,
634 and give kernel to update its internals. */
639 ptrace (PT_LDINFO, pid, (PTRACE_ARG3_TYPE) ldi,
640 MAX_LOAD_SEGS * sizeof(*ldi), ldi);
642 perror_with_name ("ptrace ldinfo");
647 /* We are allowed to assume CORE_ADDR == pointer. This code is
649 add_text_to_loadinfo ((CORE_ADDR) ldi->ldinfo_textorg,
650 (CORE_ADDR) ldi->ldinfo_dataorg);
651 } while (ldi->ldinfo_next
652 && (ldi = (void *) (ldi->ldinfo_next + (char *) ldi)));
655 /* Now that we've jumbled things around, re-sort them. */
656 sort_minimal_symbols ();
659 /* relocate the exec and core sections as well. */
663 /* Core file stuff. */
665 /* Relocate symtabs and read in shared library info, based on symbols
666 from the core file. */
669 xcoff_relocate_core (target)
670 struct target_ops *target;
672 /* Offset of member MEMBER in a struct of type TYPE. */
674 #define offsetof(TYPE, MEMBER) ((int) &((TYPE *)0)->MEMBER)
677 /* Size of a struct ld_info except for the variable-length filename. */
678 #define LDINFO_SIZE (offsetof (struct ld_info, ldinfo_filename))
682 struct ld_info *ldip;
685 /* Allocated size of buffer. */
686 int buffer_size = LDINFO_SIZE;
687 char *buffer = xmalloc (buffer_size);
688 struct cleanup *old = make_cleanup (free_current_contents, &buffer);
690 /* FIXME, this restriction should not exist. For now, though I'll
691 avoid coredumps with error() pending a real fix. */
694 ("Can't debug a core file without an executable file (on the RS/6000)");
696 ldinfo_sec = bfd_get_section_by_name (core_bfd, ".ldinfo");
697 if (ldinfo_sec == NULL)
700 fprintf_filtered (gdb_stderr, "Couldn't get ldinfo from core file: %s\n",
701 bfd_errmsg (bfd_get_error ()));
710 /* Read in everything but the name. */
711 if (bfd_get_section_contents (core_bfd, ldinfo_sec, buffer,
712 offset, LDINFO_SIZE) == 0)
719 if (i == buffer_size)
722 buffer = xrealloc (buffer, buffer_size);
724 if (bfd_get_section_contents (core_bfd, ldinfo_sec, &buffer[i],
727 if (buffer[i++] == '\0')
729 } while (names_found < 2);
731 ldip = (struct ld_info *) buffer;
733 /* Can't use a file descriptor from the core file; need to open it. */
734 ldip->ldinfo_fd = -1;
736 /* The first ldinfo is for the exec file, allocated elsewhere. */
740 vp = add_vmap (ldip);
742 offset += ldip->ldinfo_next;
744 /* We can assume pointer == CORE_ADDR, this code is native only. */
745 vp->tstart = (CORE_ADDR) ldip->ldinfo_textorg;
746 vp->tend = vp->tstart + ldip->ldinfo_textsize;
747 vp->dstart = (CORE_ADDR) ldip->ldinfo_dataorg;
748 vp->dend = vp->dstart + ldip->ldinfo_datasize;
750 #ifdef DONT_RELOCATE_SYMFILE_OBJFILE
753 vp->dstart = (CORE_ADDR) 0;
754 vp->dend = ldip->ldinfo_datasize;
760 vp->tstart += vp->tadj;
761 vp->tend += vp->tadj;
764 /* Unless this is the exec file,
765 add our sections to the section table for the core target. */
769 struct section_table *stp;
772 /* We must update the to_sections field in the core_ops structure
773 now to avoid dangling pointer dereferences. */
774 update_coreops = core_ops.to_sections == target->to_sections;
776 count = target->to_sections_end - target->to_sections;
778 target->to_sections = (struct section_table *)
779 xrealloc (target->to_sections,
780 sizeof (struct section_table) * count);
781 target->to_sections_end = target->to_sections + count;
783 /* Update the to_sections field in the core_ops structure
787 core_ops.to_sections = target->to_sections;
788 core_ops.to_sections_end = target->to_sections_end;
790 stp = target->to_sections_end - 2;
792 /* "Why do we add bfd_section_vma?", I hear you cry.
793 Well, the start of the section in the file is actually
794 that far into the section as the struct vmap understands it.
795 So for text sections, bfd_section_vma tends to be 0x200,
796 and if vp->tstart is 0xd0002000, then the first byte of
797 the text section on disk corresponds to address 0xd0002200. */
799 stp->the_bfd_section = bfd_get_section_by_name (stp->bfd, ".text");
800 stp->addr = bfd_section_vma (stp->bfd, stp->the_bfd_section) + vp->tstart;
801 stp->endaddr = bfd_section_vma (stp->bfd, stp->the_bfd_section) + vp->tend;
805 stp->the_bfd_section = bfd_get_section_by_name (stp->bfd, ".data");
806 stp->addr = bfd_section_vma (stp->bfd, stp->the_bfd_section) + vp->dstart;
807 stp->endaddr = bfd_section_vma (stp->bfd, stp->the_bfd_section) + vp->dend;
812 add_text_to_loadinfo ((CORE_ADDR)ldip->ldinfo_textorg,
813 (CORE_ADDR)ldip->ldinfo_dataorg);
814 } while (ldip->ldinfo_next != 0);
816 breakpoint_re_set ();
823 return (sizeof (struct user));
827 /* Register that we are able to handle rs6000 core file formats. */
829 static struct core_fns rs6000_core_fns =
831 bfd_target_coff_flavour,
832 fetch_core_registers,
837 _initialize_core_rs6000 ()
839 /* For native configurations, where this module is included, inform
840 the xcoffsolib module where it can find the function for symbol table
841 relocation at runtime. */
842 xcoff_relocate_symtab_hook = &xcoff_relocate_symtab;
843 add_core_fns (&rs6000_core_fns);