/* IBM RS/6000 native-dependent code for GDB, the GNU debugger.
- Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
+ Copyright 1986, 1987, 1989, 1991, 1992, 1994, 1995, 1996, 1997, 1998
+ Free Software Foundation, Inc.
-This file is part of GDB.
+ This file is part of GDB.
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "inferior.h"
#include "target.h"
+#include "gdbcore.h"
+#include "xcoffsolib.h"
+#include "symfile.h"
+#include "objfiles.h"
+#include "libbfd.h" /* For bfd_cache_lookup (FIXME) */
+#include "bfd.h"
+#include "gdb-stabs.h"
#include <sys/ptrace.h>
#include <sys/reg.h>
#include <a.out.h>
#include <sys/file.h>
-#include <sys/stat.h>
+#include "gdb_stat.h"
#include <sys/core.h>
+#include <sys/ldr.h>
extern int errno;
-static void
-exec_one_dummy_insn PARAMS ((void));
+extern struct vmap *map_vmap (bfd * bf, bfd * arch);
+
+extern struct target_ops exec_ops;
+
+static void vmap_exec (void);
+
+static void vmap_ldinfo (struct ld_info *);
+
+static struct vmap *add_vmap (struct ld_info *);
+
+static int objfile_symbol_add (char *);
+
+static void vmap_symtab (struct vmap *);
+
+static void fetch_core_registers (char *, unsigned int, int, CORE_ADDR);
+
+static void exec_one_dummy_insn (void);
+
+extern void
+fixup_breakpoints (CORE_ADDR low, CORE_ADDR high, CORE_ADDR delta);
/* Conversion from gdb-to-system special purpose register numbers.. */
-static int special_regs[] = {
- IAR, /* PC_REGNUM */
- MSR, /* PS_REGNUM */
- CR, /* CR_REGNUM */
- LR, /* LR_REGNUM */
- CTR, /* CTR_REGNUM */
+static int special_regs[] =
+{
+ IAR, /* PC_REGNUM */
+ MSR, /* PS_REGNUM */
+ CR, /* CR_REGNUM */
+ LR, /* LR_REGNUM */
+ CTR, /* CTR_REGNUM */
XER, /* XER_REGNUM */
- MQ /* MQ_REGNUM */
+ MQ /* MQ_REGNUM */
};
void
fetch_inferior_registers (regno)
- int regno;
+ int regno;
{
int ii;
- extern char registers[];
- if (regno < 0) { /* for all registers */
+ if (regno < 0)
+ { /* for all registers */
- /* read 32 general purpose registers. */
+ /* read 32 general purpose registers. */
- for (ii=0; ii < 32; ++ii)
- *(int*)®isters[REGISTER_BYTE (ii)] =
- ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) ii, 0, 0);
+ for (ii = 0; ii < 32; ++ii)
+ *(int *) ®isters[REGISTER_BYTE (ii)] =
+ ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) ii, 0, 0);
- /* read general purpose floating point registers. */
+ /* read general purpose floating point registers. */
- for (ii=0; ii < 32; ++ii)
- ptrace (PT_READ_FPR, inferior_pid,
- (PTRACE_ARG3_TYPE) ®isters [REGISTER_BYTE (FP0_REGNUM+ii)],
- FPR0+ii, 0);
+ for (ii = 0; ii < 32; ++ii)
+ ptrace (PT_READ_FPR, inferior_pid,
+ (PTRACE_ARG3_TYPE) & registers[REGISTER_BYTE (FP0_REGNUM + ii)],
+ FPR0 + ii, 0);
- /* read special registers. */
- for (ii=0; ii <= LAST_SP_REGNUM-FIRST_SP_REGNUM; ++ii)
- *(int*)®isters[REGISTER_BYTE (FIRST_SP_REGNUM+ii)] =
- ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) special_regs[ii],
- 0, 0);
+ /* read special registers. */
+ for (ii = 0; ii <= LAST_UISA_SP_REGNUM - FIRST_UISA_SP_REGNUM; ++ii)
+ *(int *) ®isters[REGISTER_BYTE (FIRST_UISA_SP_REGNUM + ii)] =
+ ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) special_regs[ii],
+ 0, 0);
- registers_fetched ();
- return;
- }
+ registers_fetched ();
+ return;
+ }
/* else an individual register is addressed. */
- else if (regno < FP0_REGNUM) { /* a GPR */
- *(int*)®isters[REGISTER_BYTE (regno)] =
+ else if (regno < FP0_REGNUM)
+ { /* a GPR */
+ *(int *) ®isters[REGISTER_BYTE (regno)] =
ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) regno, 0, 0);
- }
- else if (regno <= FPLAST_REGNUM) { /* a FPR */
- ptrace (PT_READ_FPR, inferior_pid,
- (PTRACE_ARG3_TYPE) ®isters [REGISTER_BYTE (regno)],
- (regno-FP0_REGNUM+FPR0), 0);
- }
- else if (regno <= LAST_SP_REGNUM) { /* a special register */
- *(int*)®isters[REGISTER_BYTE (regno)] =
+ }
+ else if (regno <= FPLAST_REGNUM)
+ { /* a FPR */
+ ptrace (PT_READ_FPR, inferior_pid,
+ (PTRACE_ARG3_TYPE) & registers[REGISTER_BYTE (regno)],
+ (regno - FP0_REGNUM + FPR0), 0);
+ }
+ else if (regno <= LAST_UISA_SP_REGNUM)
+ { /* a special register */
+ *(int *) ®isters[REGISTER_BYTE (regno)] =
ptrace (PT_READ_GPR, inferior_pid,
- (PTRACE_ARG3_TYPE) special_regs[regno-FIRST_SP_REGNUM], 0, 0);
- }
+ (PTRACE_ARG3_TYPE) special_regs[regno - FIRST_UISA_SP_REGNUM],
+ 0, 0);
+ }
else
- fprintf (stderr, "gdb error: register no %d not implemented.\n", regno);
+ fprintf_unfiltered (gdb_stderr,
+ "gdb error: register no %d not implemented.\n",
+ regno);
- register_valid [regno] = 1;
+ register_valid[regno] = 1;
}
/* Store our register values back into the inferior.
store_inferior_registers (regno)
int regno;
{
- extern char registers[];
errno = 0;
- if (regno == -1) { /* for all registers.. */
+ if (regno == -1)
+ { /* for all registers.. */
int ii;
- /* execute one dummy instruction (which is a breakpoint) in inferior
- process. So give kernel a chance to do internal house keeping.
- Otherwise the following ptrace(2) calls will mess up user stack
- since kernel will get confused about the bottom of the stack (%sp) */
+ /* execute one dummy instruction (which is a breakpoint) in inferior
+ process. So give kernel a chance to do internal house keeping.
+ Otherwise the following ptrace(2) calls will mess up user stack
+ since kernel will get confused about the bottom of the stack (%sp) */
- exec_one_dummy_insn ();
+ exec_one_dummy_insn ();
/* write general purpose registers first! */
- for ( ii=GPR0; ii<=GPR31; ++ii) {
- ptrace (PT_WRITE_GPR, inferior_pid, (PTRACE_ARG3_TYPE) ii,
- *(int*)®isters[REGISTER_BYTE (ii)], 0);
- if ( errno ) {
- perror ("ptrace write_gpr"); errno = 0;
+ for (ii = GPR0; ii <= GPR31; ++ii)
+ {
+ ptrace (PT_WRITE_GPR, inferior_pid, (PTRACE_ARG3_TYPE) ii,
+ *(int *) ®isters[REGISTER_BYTE (ii)], 0);
+ if (errno)
+ {
+ perror ("ptrace write_gpr");
+ errno = 0;
+ }
}
- }
/* write floating point registers now. */
- for ( ii=0; ii < 32; ++ii) {
- ptrace (PT_WRITE_FPR, inferior_pid,
- (PTRACE_ARG3_TYPE) ®isters[REGISTER_BYTE (FP0_REGNUM+ii)],
- FPR0+ii, 0);
- if ( errno ) {
- perror ("ptrace write_fpr"); errno = 0;
- }
- }
+ for (ii = 0; ii < 32; ++ii)
+ {
+ ptrace (PT_WRITE_FPR, inferior_pid,
+ (PTRACE_ARG3_TYPE) & registers[REGISTER_BYTE (FP0_REGNUM + ii)],
+ FPR0 + ii, 0);
+ if (errno)
+ {
+ perror ("ptrace write_fpr");
+ errno = 0;
+ }
+ }
/* write special registers. */
- for (ii=0; ii <= LAST_SP_REGNUM-FIRST_SP_REGNUM; ++ii) {
- ptrace (PT_WRITE_GPR, inferior_pid,
- (PTRACE_ARG3_TYPE) special_regs[ii],
- *(int*)®isters[REGISTER_BYTE (FIRST_SP_REGNUM+ii)], 0);
- if ( errno ) {
- perror ("ptrace write_gpr"); errno = 0;
+ for (ii = 0; ii <= LAST_UISA_SP_REGNUM - FIRST_UISA_SP_REGNUM; ++ii)
+ {
+ ptrace (PT_WRITE_GPR, inferior_pid,
+ (PTRACE_ARG3_TYPE) special_regs[ii],
+ *(int *) ®isters[REGISTER_BYTE (FIRST_UISA_SP_REGNUM + ii)],
+ 0);
+ if (errno)
+ {
+ perror ("ptrace write_gpr");
+ errno = 0;
+ }
}
- }
- }
+ }
/* else, a specific register number is given... */
- else if (regno < FP0_REGNUM) { /* a GPR */
-
- ptrace (PT_WRITE_GPR, inferior_pid, (PTRACE_ARG3_TYPE) regno,
- *(int*)®isters[REGISTER_BYTE (regno)], 0);
- }
-
- else if (regno <= FPLAST_REGNUM) { /* a FPR */
- ptrace (PT_WRITE_FPR, inferior_pid,
- (PTRACE_ARG3_TYPE) ®isters[REGISTER_BYTE (regno)],
- regno-FP0_REGNUM+FPR0, 0);
- }
-
- else if (regno <= LAST_SP_REGNUM) { /* a special register */
-
- ptrace (PT_WRITE_GPR, inferior_pid,
- (PTRACE_ARG3_TYPE) special_regs [regno-FIRST_SP_REGNUM],
- *(int*)®isters[REGISTER_BYTE (regno)], 0);
- }
+ else if (regno < FP0_REGNUM) /* a GPR */
+ {
+ if (regno == SP_REGNUM)
+ exec_one_dummy_insn ();
+ ptrace (PT_WRITE_GPR, inferior_pid, (PTRACE_ARG3_TYPE) regno,
+ *(int *) ®isters[REGISTER_BYTE (regno)], 0);
+ }
+
+ else if (regno <= FPLAST_REGNUM) /* a FPR */
+ {
+ ptrace (PT_WRITE_FPR, inferior_pid,
+ (PTRACE_ARG3_TYPE) & registers[REGISTER_BYTE (regno)],
+ regno - FP0_REGNUM + FPR0, 0);
+ }
+
+ else if (regno <= LAST_UISA_SP_REGNUM) /* a special register */
+ {
+ ptrace (PT_WRITE_GPR, inferior_pid,
+ (PTRACE_ARG3_TYPE) special_regs[regno - FIRST_UISA_SP_REGNUM],
+ *(int *) ®isters[REGISTER_BYTE (regno)], 0);
+ }
+
+ else if (regno < NUM_REGS)
+ {
+ /* Ignore it. */
+ }
else
- fprintf (stderr, "Gdb error: register no %d not implemented.\n", regno);
+ fprintf_unfiltered (gdb_stderr,
+ "Gdb error: register no %d not implemented.\n",
+ regno);
- if ( errno ) {
- perror ("ptrace write"); errno = 0;
- }
+ if (errno)
+ {
+ perror ("ptrace write");
+ errno = 0;
+ }
}
/* Execute one dummy breakpoint instruction. This way we give the kernel
a chance to do some housekeeping and update inferior's internal data,
including u_area. */
+
static void
exec_one_dummy_insn ()
{
#define DUMMY_INSN_ADDR (TEXT_SEGMENT_BASE)+0x200
- unsigned long shadow;
- unsigned int status, pid;
+ char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */
+ int status, pid;
+ CORE_ADDR prev_pc;
- /* We plant one dummy breakpoint into DUMMY_INSN_ADDR address. We assume that
- this address will never be executed again by the real code. */
+ /* We plant one dummy breakpoint into DUMMY_INSN_ADDR address. We
+ assume that this address will never be executed again by the real
+ code. */
- target_insert_breakpoint (DUMMY_INSN_ADDR, &shadow);
+ target_insert_breakpoint (DUMMY_INSN_ADDR, shadow_contents);
errno = 0;
- ptrace (PT_CONTINUE, inferior_pid, (PTRACE_ARG3_TYPE) DUMMY_INSN_ADDR, 0, 0);
+
+ /* You might think this could be done with a single ptrace call, and
+ you'd be correct for just about every platform I've ever worked
+ on. However, rs6000-ibm-aix4.1.3 seems to have screwed this up --
+ the inferior never hits the breakpoint (it's also worth noting
+ powerpc-ibm-aix4.1.3 works correctly). */
+ prev_pc = read_pc ();
+ write_pc (DUMMY_INSN_ADDR);
+ ptrace (PT_CONTINUE, inferior_pid, (PTRACE_ARG3_TYPE) 1, 0, 0);
+
if (errno)
perror ("pt_continue");
- do {
- pid = wait (&status);
- } while (pid != inferior_pid);
-
- target_remove_breakpoint (DUMMY_INSN_ADDR, &shadow);
+ do
+ {
+ pid = wait (&status);
+ }
+ while (pid != inferior_pid);
+
+ write_pc (prev_pc);
+ target_remove_breakpoint (DUMMY_INSN_ADDR, shadow_contents);
}
-void
+static void
fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
char *core_reg_sect;
unsigned core_reg_size;
int which;
- unsigned int reg_addr; /* Unused in this version */
+ CORE_ADDR reg_addr; /* Unused in this version */
{
/* fetch GPRs and special registers from the first register section
in core bfd. */
- if (which == 0) {
-
- /* copy GPRs first. */
- bcopy (core_reg_sect, registers, 32 * 4);
-
- /* gdb's internal register template and bfd's register section layout
- should share a common include file. FIXMEmgo */
- /* then comes special registes. They are supposed to be in the same
- order in gdb template and bfd `.reg' section. */
- core_reg_sect += (32 * 4);
- bcopy (core_reg_sect, ®isters [REGISTER_BYTE (FIRST_SP_REGNUM)],
- (LAST_SP_REGNUM - FIRST_SP_REGNUM + 1) * 4);
- }
+ if (which == 0)
+ {
+ /* copy GPRs first. */
+ memcpy (registers, core_reg_sect, 32 * 4);
+
+ /* gdb's internal register template and bfd's register section layout
+ should share a common include file. FIXMEmgo */
+ /* then comes special registes. They are supposed to be in the same
+ order in gdb template and bfd `.reg' section. */
+ core_reg_sect += (32 * 4);
+ memcpy (®isters[REGISTER_BYTE (FIRST_UISA_SP_REGNUM)],
+ core_reg_sect,
+ (LAST_UISA_SP_REGNUM - FIRST_UISA_SP_REGNUM + 1) * 4);
+ }
/* fetch floating point registers from register section 2 in core bfd. */
else if (which == 2)
- bcopy (core_reg_sect, ®isters [REGISTER_BYTE (FP0_REGNUM)], 32 * 8);
+ memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], core_reg_sect, 32 * 8);
+
+ else
+ fprintf_unfiltered
+ (gdb_stderr,
+ "Gdb error: unknown parameter to fetch_core_registers().\n");
+}
+\f
+/* handle symbol translation on vmapping */
+
+static void
+vmap_symtab (vp)
+ register struct vmap *vp;
+{
+ register struct objfile *objfile;
+ struct section_offsets *new_offsets;
+ int i;
+
+ objfile = vp->objfile;
+ if (objfile == NULL)
+ {
+ /* OK, it's not an objfile we opened ourselves.
+ Currently, that can only happen with the exec file, so
+ relocate the symbols for the symfile. */
+ if (symfile_objfile == NULL)
+ return;
+ objfile = symfile_objfile;
+ }
+
+ new_offsets = (struct section_offsets *) alloca (SIZEOF_SECTION_OFFSETS);
+
+ for (i = 0; i < objfile->num_sections; ++i)
+ ANOFFSET (new_offsets, i) = ANOFFSET (objfile->section_offsets, i);
+
+ /* The symbols in the object file are linked to the VMA of the section,
+ relocate them VMA relative. */
+ ANOFFSET (new_offsets, SECT_OFF_TEXT (objfile)) = vp->tstart - vp->tvma;
+ ANOFFSET (new_offsets, SECT_OFF_DATA (objfile)) = vp->dstart - vp->dvma;
+ ANOFFSET (new_offsets, SECT_OFF_BSS (objfile)) = vp->dstart - vp->dvma;
+
+ objfile_relocate (objfile, new_offsets);
+}
+\f
+/* Add symbols for an objfile. */
+
+static int
+objfile_symbol_add (arg)
+ char *arg;
+{
+ struct objfile *obj = (struct objfile *) arg;
+
+ syms_from_objfile (obj, NULL, 0, 0);
+ new_symfile_objfile (obj, 0, 0);
+ return 1;
+}
+
+/* Add a new vmap entry based on ldinfo() information.
+
+ If ldi->ldinfo_fd is not valid (e.g. this struct ld_info is from a
+ core file), the caller should set it to -1, and we will open the file.
+
+ Return the vmap new entry. */
+
+static struct vmap *
+add_vmap (ldi)
+ register struct ld_info *ldi;
+{
+ bfd *abfd, *last;
+ register char *mem, *objname;
+ struct objfile *obj;
+ struct vmap *vp;
+
+ /* This ldi structure was allocated using alloca() in
+ xcoff_relocate_symtab(). Now we need to have persistent object
+ and member names, so we should save them. */
+
+ mem = ldi->ldinfo_filename + strlen (ldi->ldinfo_filename) + 1;
+ mem = savestring (mem, strlen (mem));
+ objname = savestring (ldi->ldinfo_filename, strlen (ldi->ldinfo_filename));
+
+ if (ldi->ldinfo_fd < 0)
+ /* Note that this opens it once for every member; a possible
+ enhancement would be to only open it once for every object. */
+ abfd = bfd_openr (objname, gnutarget);
+ else
+ abfd = bfd_fdopenr (objname, gnutarget, ldi->ldinfo_fd);
+ if (!abfd)
+ error ("Could not open `%s' as an executable file: %s",
+ objname, bfd_errmsg (bfd_get_error ()));
+
+ /* make sure we have an object file */
+
+ if (bfd_check_format (abfd, bfd_object))
+ vp = map_vmap (abfd, 0);
+
+ else if (bfd_check_format (abfd, bfd_archive))
+ {
+ last = 0;
+ /* FIXME??? am I tossing BFDs? bfd? */
+ while ((last = bfd_openr_next_archived_file (abfd, last)))
+ if (STREQ (mem, last->filename))
+ break;
+
+ if (!last)
+ {
+ bfd_close (abfd);
+ /* FIXME -- should be error */
+ warning ("\"%s\": member \"%s\" missing.", abfd->filename, mem);
+ return 0;
+ }
+
+ if (!bfd_check_format (last, bfd_object))
+ {
+ bfd_close (last); /* XXX??? */
+ goto obj_err;
+ }
+ vp = map_vmap (last, abfd);
+ }
else
- fprintf (stderr, "Gdb error: unknown parameter to fetch_core_registers().\n");
+ {
+ obj_err:
+ bfd_close (abfd);
+ error ("\"%s\": not in executable format: %s.",
+ objname, bfd_errmsg (bfd_get_error ()));
+ /*NOTREACHED */
+ }
+ obj = allocate_objfile (vp->bfd, 0);
+ vp->objfile = obj;
+
+#ifndef SOLIB_SYMBOLS_MANUAL
+ if (catch_errors (objfile_symbol_add, (char *) obj,
+ "Error while reading shared library symbols:\n",
+ RETURN_MASK_ALL))
+ {
+ /* Note this is only done if symbol reading was successful. */
+ vmap_symtab (vp);
+ vp->loaded = 1;
+ }
+#endif
+ return vp;
+}
+\f
+/* update VMAP info with ldinfo() information
+ Input is ptr to ldinfo() results. */
+
+static void
+vmap_ldinfo (ldi)
+ register struct ld_info *ldi;
+{
+ struct stat ii, vi;
+ register struct vmap *vp;
+ int got_one, retried;
+ int got_exec_file = 0;
+
+ /* For each *ldi, see if we have a corresponding *vp.
+ If so, update the mapping, and symbol table.
+ If not, add an entry and symbol table. */
+
+ do
+ {
+ char *name = ldi->ldinfo_filename;
+ char *memb = name + strlen (name) + 1;
+
+ retried = 0;
+
+ if (fstat (ldi->ldinfo_fd, &ii) < 0)
+ {
+ /* The kernel sets ld_info to -1, if the process is still using the
+ object, and the object is removed. Keep the symbol info for the
+ removed object and issue a warning. */
+ warning ("%s (fd=%d) has disappeared, keeping its symbols",
+ name, ldi->ldinfo_fd);
+ continue;
+ }
+ retry:
+ for (got_one = 0, vp = vmap; vp; vp = vp->nxt)
+ {
+ struct objfile *objfile;
+
+ /* First try to find a `vp', which is the same as in ldinfo.
+ If not the same, just continue and grep the next `vp'. If same,
+ relocate its tstart, tend, dstart, dend values. If no such `vp'
+ found, get out of this for loop, add this ldi entry as a new vmap
+ (add_vmap) and come back, find its `vp' and so on... */
+
+ /* The filenames are not always sufficient to match on. */
+
+ if ((name[0] == '/' && !STREQ (name, vp->name))
+ || (memb[0] && !STREQ (memb, vp->member)))
+ continue;
+
+ /* See if we are referring to the same file.
+ We have to check objfile->obfd, symfile.c:reread_symbols might
+ have updated the obfd after a change. */
+ objfile = vp->objfile == NULL ? symfile_objfile : vp->objfile;
+ if (objfile == NULL
+ || objfile->obfd == NULL
+ || bfd_stat (objfile->obfd, &vi) < 0)
+ {
+ warning ("Unable to stat %s, keeping its symbols", name);
+ continue;
+ }
+
+ if (ii.st_dev != vi.st_dev || ii.st_ino != vi.st_ino)
+ continue;
+
+ if (!retried)
+ close (ldi->ldinfo_fd);
+
+ ++got_one;
+
+ /* Found a corresponding VMAP. Remap! */
+
+ /* We can assume pointer == CORE_ADDR, this code is native only. */
+ vp->tstart = (CORE_ADDR) ldi->ldinfo_textorg;
+ vp->tend = vp->tstart + ldi->ldinfo_textsize;
+ vp->dstart = (CORE_ADDR) ldi->ldinfo_dataorg;
+ vp->dend = vp->dstart + ldi->ldinfo_datasize;
+
+ /* The run time loader maps the file header in addition to the text
+ section and returns a pointer to the header in ldinfo_textorg.
+ Adjust the text start address to point to the real start address
+ of the text section. */
+ vp->tstart += vp->toffs;
+
+ /* The objfile is only NULL for the exec file. */
+ if (vp->objfile == NULL)
+ got_exec_file = 1;
+
+ /* relocate symbol table(s). */
+ vmap_symtab (vp);
+
+ /* There may be more, so we don't break out of the loop. */
+ }
+
+ /* if there was no matching *vp, we must perforce create the sucker(s) */
+ if (!got_one && !retried)
+ {
+ add_vmap (ldi);
+ ++retried;
+ goto retry;
+ }
+ }
+ while (ldi->ldinfo_next
+ && (ldi = (void *) (ldi->ldinfo_next + (char *) ldi)));
+
+ /* If we don't find the symfile_objfile anywhere in the ldinfo, it
+ is unlikely that the symbol file is relocated to the proper
+ address. And we might have attached to a process which is
+ running a different copy of the same executable. */
+ if (symfile_objfile != NULL && !got_exec_file)
+ {
+ warning_begin ();
+ fputs_unfiltered ("Symbol file ", gdb_stderr);
+ fputs_unfiltered (symfile_objfile->name, gdb_stderr);
+ fputs_unfiltered ("\nis not mapped; discarding it.\n\
+If in fact that file has symbols which the mapped files listed by\n\
+\"info files\" lack, you can load symbols with the \"symbol-file\" or\n\
+\"add-symbol-file\" commands (note that you must take care of relocating\n\
+symbols to the proper address).\n", gdb_stderr);
+ free_objfile (symfile_objfile);
+ symfile_objfile = NULL;
+ }
+ breakpoint_re_set ();
+}
+\f
+/* As well as symbol tables, exec_sections need relocation. After
+ the inferior process' termination, there will be a relocated symbol
+ table exist with no corresponding inferior process. At that time, we
+ need to use `exec' bfd, rather than the inferior process's memory space
+ to look up symbols.
+
+ `exec_sections' need to be relocated only once, as long as the exec
+ file remains unchanged.
+ */
+
+static void
+vmap_exec ()
+{
+ static bfd *execbfd;
+ int i;
+
+ if (execbfd == exec_bfd)
+ return;
+
+ execbfd = exec_bfd;
+
+ if (!vmap || !exec_ops.to_sections)
+ error ("vmap_exec: vmap or exec_ops.to_sections == 0\n");
+
+ for (i = 0; &exec_ops.to_sections[i] < exec_ops.to_sections_end; i++)
+ {
+ if (STREQ (".text", exec_ops.to_sections[i].the_bfd_section->name))
+ {
+ exec_ops.to_sections[i].addr += vmap->tstart - vmap->tvma;
+ exec_ops.to_sections[i].endaddr += vmap->tstart - vmap->tvma;
+ }
+ else if (STREQ (".data", exec_ops.to_sections[i].the_bfd_section->name))
+ {
+ exec_ops.to_sections[i].addr += vmap->dstart - vmap->dvma;
+ exec_ops.to_sections[i].endaddr += vmap->dstart - vmap->dvma;
+ }
+ else if (STREQ (".bss", exec_ops.to_sections[i].the_bfd_section->name))
+ {
+ exec_ops.to_sections[i].addr += vmap->dstart - vmap->dvma;
+ exec_ops.to_sections[i].endaddr += vmap->dstart - vmap->dvma;
+ }
+ }
+}
+\f
+/* xcoff_relocate_symtab - hook for symbol table relocation.
+ also reads shared libraries.. */
+
+void
+xcoff_relocate_symtab (pid)
+ unsigned int pid;
+{
+ int load_segs = 64; /* number of load segments */
+ int rc;
+ struct ld_info *ldi = NULL;
+
+ do
+ {
+ ldi = (void *) xrealloc (ldi, load_segs * sizeof (*ldi));
+
+ /* According to my humble theory, AIX has some timing problems and
+ when the user stack grows, kernel doesn't update stack info in time
+ and ptrace calls step on user stack. That is why we sleep here a
+ little, and give kernel to update its internals. */
+
+ usleep (36000);
+
+ errno = 0;
+ rc = ptrace (PT_LDINFO, pid, (PTRACE_ARG3_TYPE) ldi,
+ load_segs * sizeof (*ldi), (int *) ldi);
+ if (rc == -1)
+ {
+ if (errno == ENOMEM)
+ load_segs *= 2;
+ else
+ perror_with_name ("ptrace ldinfo");
+ }
+ else
+ {
+ vmap_ldinfo (ldi);
+ vmap_exec (); /* relocate the exec and core sections as well. */
+ }
+ } while (rc == -1);
+ if (ldi)
+ free (ldi);
+}
+\f
+/* Core file stuff. */
+
+/* Relocate symtabs and read in shared library info, based on symbols
+ from the core file. */
+
+void
+xcoff_relocate_core (target)
+ struct target_ops *target;
+{
+/* Offset of member MEMBER in a struct of type TYPE. */
+#ifndef offsetof
+#define offsetof(TYPE, MEMBER) ((int) &((TYPE *)0)->MEMBER)
+#endif
+
+/* Size of a struct ld_info except for the variable-length filename. */
+#define LDINFO_SIZE (offsetof (struct ld_info, ldinfo_filename))
+
+ sec_ptr ldinfo_sec;
+ int offset = 0;
+ struct ld_info *ldip;
+ struct vmap *vp;
+
+ /* Allocated size of buffer. */
+ int buffer_size = LDINFO_SIZE;
+ char *buffer = xmalloc (buffer_size);
+ struct cleanup *old = make_cleanup (free_current_contents, &buffer);
+
+ /* FIXME, this restriction should not exist. For now, though I'll
+ avoid coredumps with error() pending a real fix. */
+ if (vmap == NULL)
+ error
+ ("Can't debug a core file without an executable file (on the RS/6000)");
+
+ ldinfo_sec = bfd_get_section_by_name (core_bfd, ".ldinfo");
+ if (ldinfo_sec == NULL)
+ {
+ bfd_err:
+ fprintf_filtered (gdb_stderr, "Couldn't get ldinfo from core file: %s\n",
+ bfd_errmsg (bfd_get_error ()));
+ do_cleanups (old);
+ return;
+ }
+ do
+ {
+ int i;
+ int names_found = 0;
+
+ /* Read in everything but the name. */
+ if (bfd_get_section_contents (core_bfd, ldinfo_sec, buffer,
+ offset, LDINFO_SIZE) == 0)
+ goto bfd_err;
+
+ /* Now the name. */
+ i = LDINFO_SIZE;
+ do
+ {
+ if (i == buffer_size)
+ {
+ buffer_size *= 2;
+ buffer = xrealloc (buffer, buffer_size);
+ }
+ if (bfd_get_section_contents (core_bfd, ldinfo_sec, &buffer[i],
+ offset + i, 1) == 0)
+ goto bfd_err;
+ if (buffer[i++] == '\0')
+ ++names_found;
+ }
+ while (names_found < 2);
+
+ ldip = (struct ld_info *) buffer;
+
+ /* Can't use a file descriptor from the core file; need to open it. */
+ ldip->ldinfo_fd = -1;
+
+ /* The first ldinfo is for the exec file, allocated elsewhere. */
+ if (offset == 0)
+ vp = vmap;
+ else
+ vp = add_vmap (ldip);
+
+ offset += ldip->ldinfo_next;
+
+ /* We can assume pointer == CORE_ADDR, this code is native only. */
+ vp->tstart = (CORE_ADDR) ldip->ldinfo_textorg;
+ vp->tend = vp->tstart + ldip->ldinfo_textsize;
+ vp->dstart = (CORE_ADDR) ldip->ldinfo_dataorg;
+ vp->dend = vp->dstart + ldip->ldinfo_datasize;
+
+ /* The run time loader maps the file header in addition to the text
+ section and returns a pointer to the header in ldinfo_textorg.
+ Adjust the text start address to point to the real start address
+ of the text section. */
+ vp->tstart += vp->toffs;
+
+ /* Unless this is the exec file,
+ add our sections to the section table for the core target. */
+ if (vp != vmap)
+ {
+ struct section_table *stp;
+
+ target_resize_to_sections (target, 2);
+ stp = target->to_sections_end - 2;
+
+ stp->bfd = vp->bfd;
+ stp->the_bfd_section = bfd_get_section_by_name (stp->bfd, ".text");
+ stp->addr = vp->tstart;
+ stp->endaddr = vp->tend;
+ stp++;
+
+ stp->bfd = vp->bfd;
+ stp->the_bfd_section = bfd_get_section_by_name (stp->bfd, ".data");
+ stp->addr = vp->dstart;
+ stp->endaddr = vp->dend;
+ }
+
+ vmap_symtab (vp);
+ }
+ while (ldip->ldinfo_next != 0);
+ vmap_exec ();
+ breakpoint_re_set ();
+ do_cleanups (old);
+}
+
+int
+kernel_u_size ()
+{
+ return (sizeof (struct user));
+}
+\f
+/* Under AIX, we have to pass the correct TOC pointer to a function
+ when calling functions in the inferior.
+ We try to find the relative toc offset of the objfile containing PC
+ and add the current load address of the data segment from the vmap. */
+
+static CORE_ADDR
+find_toc_address (pc)
+ CORE_ADDR pc;
+{
+ struct vmap *vp;
+
+ for (vp = vmap; vp; vp = vp->nxt)
+ {
+ if (pc >= vp->tstart && pc < vp->tend)
+ {
+ /* vp->objfile is only NULL for the exec file. */
+ return vp->dstart + get_toc_offset (vp->objfile == NULL
+ ? symfile_objfile
+ : vp->objfile);
+ }
+ }
+ error ("Unable to find TOC entry for pc 0x%x\n", pc);
+}
+\f
+/* Register that we are able to handle rs6000 core file formats. */
+
+static struct core_fns rs6000_core_fns =
+{
+ bfd_target_coff_flavour, /* core_flavour */
+ default_check_format, /* check_format */
+ default_core_sniffer, /* core_sniffer */
+ fetch_core_registers, /* core_read_registers */
+ NULL /* next */
+};
+
+void
+_initialize_core_rs6000 ()
+{
+ /* Initialize hook in rs6000-tdep.c for determining the TOC address when
+ calling functions in the inferior. */
+ find_toc_address_hook = &find_toc_address;
+
+ /* For native configurations, where this module is included, inform
+ the xcoffsolib module where it can find the function for symbol table
+ relocation at runtime. */
+ xcoff_relocate_symtab_hook = &xcoff_relocate_symtab;
+ add_core_fns (&rs6000_core_fns);
}
projects / deliverable / binutils-gdb.git / blobdiff