/* IBM RS/6000 native-dependent code for GDB, the GNU debugger.
- Copyright 1986, 1987, 1989, 1991, 1992, 1994, 1995, 1996
- Free Software Foundation, Inc.
-This file is part of GDB.
+ Copyright (C) 1986-2017 Free Software Foundation, Inc.
-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 file is part of GDB.
-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 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 3 of the License, or
+ (at your option) any later version.
-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. */
+ 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, see <http://www.gnu.org/licenses/>. */
#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 "regcache.h"
+#include "arch-utils.h"
+#include "inf-child.h"
+#include "inf-ptrace.h"
+#include "ppc-tdep.h"
+#include "rs6000-tdep.h"
+#include "rs6000-aix-tdep.h"
+#include "exec.h"
+#include "observer.h"
+#include "xcoffread.h"
#include <sys/ptrace.h>
#include <sys/reg.h>
-#include <sys/param.h>
#include <sys/dir.h>
#include <sys/user.h>
#include <signal.h>
#include <a.out.h>
#include <sys/file.h>
-#include "gdb_stat.h"
+#include <sys/stat.h>
+#include "gdb_bfd.h"
#include <sys/core.h>
+#define __LDINFO_PTRACE32__ /* for __ld_info32 */
+#define __LDINFO_PTRACE64__ /* for __ld_info64 */
#include <sys/ldr.h>
+#include <sys/systemcfg.h>
-extern int errno;
-
-extern struct vmap * map_vmap PARAMS ((bfd *bf, bfd *arch));
+/* On AIX4.3+, sys/ldr.h provides different versions of struct ld_info for
+ debugging 32-bit and 64-bit processes. Define a typedef and macros for
+ accessing fields in the appropriate structures. */
-extern struct target_ops exec_ops;
+/* In 32-bit compilation mode (which is the only mode from which ptrace()
+ works on 4.3), __ld_info32 is #defined as equivalent to ld_info. */
-static void
-exec_one_dummy_insn PARAMS ((void));
+#if defined (__ld_info32) || defined (__ld_info64)
+# define ARCH3264
+#endif
-extern void
-add_text_to_loadinfo PARAMS ((CORE_ADDR textaddr, CORE_ADDR dataaddr));
+/* Return whether the current architecture is 64-bit. */
-extern void
-fixup_breakpoints PARAMS ((CORE_ADDR low, CORE_ADDR high, CORE_ADDR delta));
+#ifndef ARCH3264
+# define ARCH64() 0
+#else
+# define ARCH64() (register_size (target_gdbarch (), 0) == 8)
+#endif
-/* Conversion from gdb-to-system special purpose register numbers.. */
+static target_xfer_partial_ftype rs6000_xfer_shared_libraries;
-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 */
-};
+/* Given REGNO, a gdb register number, return the corresponding
+ number suitable for use as a ptrace() parameter. Return -1 if
+ there's no suitable mapping. Also, set the int pointed to by
+ ISFLOAT to indicate whether REGNO is a floating point register. */
-void
-fetch_inferior_registers (regno)
- int regno;
+static int
+regmap (struct gdbarch *gdbarch, int regno, int *isfloat)
{
- int ii;
- extern char registers[];
-
- if (regno < 0) { /* for all 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);
-
- /* 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);
-
- /* 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);
-
- registers_fetched ();
- return;
- }
-
- /* else an individual register is addressed. */
-
- 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)] =
- ptrace (PT_READ_GPR, inferior_pid,
- (PTRACE_ARG3_TYPE) special_regs[regno-FIRST_SP_REGNUM], 0, 0);
- }
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ *isfloat = 0;
+ if (tdep->ppc_gp0_regnum <= regno
+ && regno < tdep->ppc_gp0_regnum + ppc_num_gprs)
+ return regno;
+ else if (tdep->ppc_fp0_regnum >= 0
+ && tdep->ppc_fp0_regnum <= regno
+ && regno < tdep->ppc_fp0_regnum + ppc_num_fprs)
+ {
+ *isfloat = 1;
+ return regno - tdep->ppc_fp0_regnum + FPR0;
+ }
+ else if (regno == gdbarch_pc_regnum (gdbarch))
+ return IAR;
+ else if (regno == tdep->ppc_ps_regnum)
+ return MSR;
+ else if (regno == tdep->ppc_cr_regnum)
+ return CR;
+ else if (regno == tdep->ppc_lr_regnum)
+ return LR;
+ else if (regno == tdep->ppc_ctr_regnum)
+ return CTR;
+ else if (regno == tdep->ppc_xer_regnum)
+ return XER;
+ else if (tdep->ppc_fpscr_regnum >= 0
+ && regno == tdep->ppc_fpscr_regnum)
+ return FPSCR;
+ else if (tdep->ppc_mq_regnum >= 0 && regno == tdep->ppc_mq_regnum)
+ return MQ;
else
- fprintf_unfiltered (gdb_stderr, "gdb error: register no %d not implemented.\n", regno);
-
- register_valid [regno] = 1;
+ return -1;
}
-/* Store our register values back into the inferior.
- If REGNO is -1, do this for all registers.
- Otherwise, REGNO specifies which register (so we can save time). */
+/* Call ptrace(REQ, ID, ADDR, DATA, BUF). */
-void
-store_inferior_registers (regno)
- int regno;
+static int
+rs6000_ptrace32 (int req, int id, int *addr, int data, int *buf)
{
- extern char registers[];
-
- errno = 0;
-
- if (regno == -1)
- { /* for all registers.. */
- int ii;
+#ifdef HAVE_PTRACE64
+ int ret = ptrace64 (req, id, (uintptr_t) addr, data, buf);
+#else
+ int ret = ptrace (req, id, (int *)addr, data, buf);
+#endif
+#if 0
+ printf ("rs6000_ptrace32 (%d, %d, 0x%x, %08x, 0x%x) = 0x%x\n",
+ req, id, (unsigned int)addr, data, (unsigned int)buf, ret);
+#endif
+ return ret;
+}
- /* 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) */
+/* Call ptracex(REQ, ID, ADDR, DATA, BUF). */
- exec_one_dummy_insn ();
+static int
+rs6000_ptrace64 (int req, int id, long long addr, int data, void *buf)
+{
+#ifdef ARCH3264
+# ifdef HAVE_PTRACE64
+ int ret = ptrace64 (req, id, addr, data, (PTRACE_TYPE_ARG5) buf);
+# else
+ int ret = ptracex (req, id, addr, data, (PTRACE_TYPE_ARG5) buf);
+# endif
+#else
+ int ret = 0;
+#endif
+#if 0
+ printf ("rs6000_ptrace64 (%d, %d, %s, %08x, 0x%x) = 0x%x\n",
+ req, id, hex_string (addr), data, (unsigned int)buf, ret);
+#endif
+ return ret;
+}
- /* 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;
- }
- }
+/* Fetch register REGNO from the inferior. */
- /* 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;
- }
- }
+static void
+fetch_register (struct regcache *regcache, int regno)
+{
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ int addr[PPC_MAX_REGISTER_SIZE];
+ int nr, isfloat;
+ pid_t pid = ptid_get_pid (regcache_get_ptid (regcache));
- /* 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;
- }
- }
- }
+ /* Retrieved values may be -1, so infer errors from errno. */
+ errno = 0;
- /* else, a specific register number is given... */
+ nr = regmap (gdbarch, regno, &isfloat);
- else if (regno < FP0_REGNUM) /* a GPR */
- {
- ptrace (PT_WRITE_GPR, inferior_pid, (PTRACE_ARG3_TYPE) regno,
- *(int*)®isters[REGISTER_BYTE (regno)], 0);
- }
+ /* Floating-point registers. */
+ if (isfloat)
+ rs6000_ptrace32 (PT_READ_FPR, pid, addr, nr, 0);
- else if (regno <= FPLAST_REGNUM) /* a FPR */
+ /* Bogus register number. */
+ else if (nr < 0)
{
- ptrace (PT_WRITE_FPR, inferior_pid,
- (PTRACE_ARG3_TYPE) ®isters[REGISTER_BYTE (regno)],
- regno - FP0_REGNUM + FPR0, 0);
+ if (regno >= gdbarch_num_regs (gdbarch))
+ fprintf_unfiltered (gdb_stderr,
+ "gdb error: register no %d not implemented.\n",
+ regno);
+ return;
}
- else if (regno <= LAST_SP_REGNUM) /* a special register */
+ /* Fixed-point registers. */
+ else
{
- ptrace (PT_WRITE_GPR, inferior_pid,
- (PTRACE_ARG3_TYPE) special_regs [regno-FIRST_SP_REGNUM],
- *(int*)®isters[REGISTER_BYTE (regno)], 0);
+ if (!ARCH64 ())
+ *addr = rs6000_ptrace32 (PT_READ_GPR, pid, (int *) nr, 0, 0);
+ else
+ {
+ /* PT_READ_GPR requires the buffer parameter to point to long long,
+ even if the register is really only 32 bits. */
+ long long buf;
+ rs6000_ptrace64 (PT_READ_GPR, pid, nr, 0, &buf);
+ if (register_size (gdbarch, regno) == 8)
+ memcpy (addr, &buf, 8);
+ else
+ *addr = buf;
+ }
}
+ if (!errno)
+ regcache_raw_supply (regcache, regno, (char *) addr);
else
- fprintf_unfiltered (gdb_stderr, "Gdb error: register no %d not implemented.\n", regno);
-
- if (errno)
{
- perror ("ptrace write");
+#if 0
+ /* FIXME: this happens 3 times at the start of each 64-bit program. */
+ perror (_("ptrace read"));
+#endif
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. */
+/* Store register REGNO back into the inferior. */
static void
-exec_one_dummy_insn ()
+store_register (struct regcache *regcache, int regno)
{
-#define DUMMY_INSN_ADDR (TEXT_SEGMENT_BASE)+0x200
-
- char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */
- unsigned int status, pid;
-
- /* We plant one dummy breakpoint into DUMMY_INSN_ADDR address. We assume that
- this address will never be executed again by the real code. */
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ int addr[PPC_MAX_REGISTER_SIZE];
+ int nr, isfloat;
+ pid_t pid = ptid_get_pid (regcache_get_ptid (regcache));
- target_insert_breakpoint (DUMMY_INSN_ADDR, shadow_contents);
+ /* Fetch the register's value from the register cache. */
+ regcache_raw_collect (regcache, regno, addr);
+ /* -1 can be a successful return value, so infer errors from errno. */
errno = 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). */
- write_pc (DUMMY_INSN_ADDR);
- ptrace (PT_CONTINUE, inferior_pid, (PTRACE_ARG3_TYPE)1, 0, 0);
+ nr = regmap (gdbarch, regno, &isfloat);
- if (errno)
- perror ("pt_continue");
-
- do {
- pid = wait (&status);
- } while (pid != inferior_pid);
-
- target_remove_breakpoint (DUMMY_INSN_ADDR, shadow_contents);
-}
+ /* Floating-point registers. */
+ if (isfloat)
+ rs6000_ptrace32 (PT_WRITE_FPR, pid, addr, nr, 0);
-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 */
-{
- /* fetch GPRs and special registers from the first register section
- in core bfd. */
- if (which == 0)
+ /* Bogus register number. */
+ else if (nr < 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_SP_REGNUM)], core_reg_sect,
- (LAST_SP_REGNUM - FIRST_SP_REGNUM + 1) * 4);
+ if (regno >= gdbarch_num_regs (gdbarch))
+ fprintf_unfiltered (gdb_stderr,
+ "gdb error: register no %d not implemented.\n",
+ regno);
}
- /* fetch floating point registers from register section 2 in core bfd. */
- else if (which == 2)
- memcpy (®isters [REGISTER_BYTE (FP0_REGNUM)], core_reg_sect, 32 * 8);
-
+ /* Fixed-point registers. */
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;
- CORE_ADDR text_delta;
- CORE_ADDR data_delta;
- CORE_ADDR bss_delta;
- 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;
+ /* The PT_WRITE_GPR operation is rather odd. For 32-bit inferiors,
+ the register's value is passed by value, but for 64-bit inferiors,
+ the address of a buffer containing the value is passed. */
+ if (!ARCH64 ())
+ rs6000_ptrace32 (PT_WRITE_GPR, pid, (int *) nr, *addr, 0);
+ else
+ {
+ /* PT_WRITE_GPR requires the buffer parameter to point to an 8-byte
+ area, even if the register is really only 32 bits. */
+ long long buf;
+ if (register_size (gdbarch, regno) == 8)
+ memcpy (&buf, addr, 8);
+ else
+ buf = *addr;
+ rs6000_ptrace64 (PT_WRITE_GPR, pid, nr, 0, &buf);
+ }
}
- new_offsets = alloca
- (sizeof (struct section_offsets)
- + sizeof (new_offsets->offsets) * objfile->num_sections);
-
- for (i = 0; i < objfile->num_sections; ++i)
- ANOFFSET (new_offsets, i) = ANOFFSET (objfile->section_offsets, i);
-
- text_delta =
- vp->tstart - ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT);
- ANOFFSET (new_offsets, SECT_OFF_TEXT) = vp->tstart;
-
- data_delta =
- vp->dstart - ANOFFSET (objfile->section_offsets, SECT_OFF_DATA);
- ANOFFSET (new_offsets, SECT_OFF_DATA) = vp->dstart;
-
- bss_delta =
- vp->dstart - ANOFFSET (objfile->section_offsets, SECT_OFF_BSS);
- ANOFFSET (new_offsets, SECT_OFF_BSS) = vp->dstart;
-
- 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, 0, 0, 0);
- new_symfile_objfile (obj, 0, 0);
- return 1;
+ if (errno)
+ {
+ perror (_("ptrace write"));
+ errno = 0;
+ }
}
-/* 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. */
+/* Read from the inferior all registers if REGNO == -1 and just register
+ REGNO otherwise. */
-static struct vmap *
-add_vmap (ldi)
- register struct ld_info *ldi;
+static void
+rs6000_fetch_inferior_registers (struct target_ops *ops,
+ struct regcache *regcache, int regno)
{
- 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 */
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ if (regno != -1)
+ fetch_register (regcache, regno);
- if (bfd_check_format (abfd, bfd_object))
- vp = map_vmap (abfd, 0);
-
- else if (bfd_check_format (abfd, bfd_archive))
+ else
{
- last = 0;
- /* FIXME??? am I tossing BFDs? bfd? */
- while ((last = bfd_openr_next_archived_file (abfd, last)))
- if (STREQ (mem, last->filename))
- break;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- if (!last)
+ /* Read 32 general purpose registers. */
+ for (regno = tdep->ppc_gp0_regnum;
+ regno < tdep->ppc_gp0_regnum + ppc_num_gprs;
+ regno++)
{
- bfd_close (abfd);
- /* FIXME -- should be error */
- warning ("\"%s\": member \"%s\" missing.", abfd->filename, mem);
- return;
+ fetch_register (regcache, regno);
}
- if (!bfd_check_format(last, bfd_object))
- {
- bfd_close (last); /* XXX??? */
- goto obj_err;
- }
-
- vp = map_vmap (last, abfd);
- }
- else
- {
- obj_err:
- bfd_close (abfd);
- error ("\"%s\": not in executable format: %s.",
- objname, bfd_errmsg (bfd_get_error ()));
- /*NOTREACHED*/
+ /* Read general purpose floating point registers. */
+ if (tdep->ppc_fp0_regnum >= 0)
+ for (regno = 0; regno < ppc_num_fprs; regno++)
+ fetch_register (regcache, tdep->ppc_fp0_regnum + regno);
+
+ /* Read special registers. */
+ fetch_register (regcache, gdbarch_pc_regnum (gdbarch));
+ fetch_register (regcache, tdep->ppc_ps_regnum);
+ fetch_register (regcache, tdep->ppc_cr_regnum);
+ fetch_register (regcache, tdep->ppc_lr_regnum);
+ fetch_register (regcache, tdep->ppc_ctr_regnum);
+ fetch_register (regcache, tdep->ppc_xer_regnum);
+ if (tdep->ppc_fpscr_regnum >= 0)
+ fetch_register (regcache, tdep->ppc_fpscr_regnum);
+ if (tdep->ppc_mq_regnum >= 0)
+ fetch_register (regcache, tdep->ppc_mq_regnum);
}
- 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. */
+
+/* Store our register values back into the inferior.
+ If REGNO is -1, do this for all registers.
+ Otherwise, REGNO specifies which register (so we can save time). */
static void
-vmap_ldinfo (ldi)
- register struct ld_info *ldi;
+rs6000_store_inferior_registers (struct target_ops *ops,
+ struct regcache *regcache, int regno)
{
- struct stat ii, vi;
- register struct vmap *vp;
- int got_one, retried;
- int got_exec_file;
-
- /* 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;
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ if (regno != -1)
+ store_register (regcache, regno);
- if (fstat (ldi->ldinfo_fd, &ii) < 0)
- fatal ("cannot fstat(fd=%d) on %s", ldi->ldinfo_fd, name);
- retry:
- for (got_one = 0, vp = vmap; vp; vp = vp->nxt)
- {
- /* 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, fins 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. */
- if (bfd_stat (vp->bfd, &vi) < 0)
- /* An error here is innocuous, most likely meaning that
- the file descriptor has become worthless.
- FIXME: What does it mean for a file descriptor to become
- "worthless"? What makes it happen? What error does it
- produce (ENOENT? others?)? Should we at least provide
- a warning? */
- continue;
-
- if (ii.st_dev != vi.st_dev || ii.st_ino != vi.st_ino)
- continue;
+ else
+ {
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- if (!retried)
- close (ldi->ldinfo_fd);
+ /* Write general purpose registers first. */
+ for (regno = tdep->ppc_gp0_regnum;
+ regno < tdep->ppc_gp0_regnum + ppc_num_gprs;
+ regno++)
+ {
+ store_register (regcache, regno);
+ }
- ++got_one;
+ /* Write floating point registers. */
+ if (tdep->ppc_fp0_regnum >= 0)
+ for (regno = 0; regno < ppc_num_fprs; regno++)
+ store_register (regcache, tdep->ppc_fp0_regnum + regno);
+
+ /* Write special registers. */
+ store_register (regcache, gdbarch_pc_regnum (gdbarch));
+ store_register (regcache, tdep->ppc_ps_regnum);
+ store_register (regcache, tdep->ppc_cr_regnum);
+ store_register (regcache, tdep->ppc_lr_regnum);
+ store_register (regcache, tdep->ppc_ctr_regnum);
+ store_register (regcache, tdep->ppc_xer_regnum);
+ if (tdep->ppc_fpscr_regnum >= 0)
+ store_register (regcache, tdep->ppc_fpscr_regnum);
+ if (tdep->ppc_mq_regnum >= 0)
+ store_register (regcache, tdep->ppc_mq_regnum);
+ }
+}
- /* Found a corresponding VMAP. Remap! */
+/* Implement the to_xfer_partial target_ops method. */
- /* 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;
+static enum target_xfer_status
+rs6000_xfer_partial (struct target_ops *ops, enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf,
+ ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
+{
+ pid_t pid = ptid_get_pid (inferior_ptid);
+ int arch64 = ARCH64 ();
- if (vp->tadj)
+ switch (object)
+ {
+ case TARGET_OBJECT_LIBRARIES_AIX:
+ return rs6000_xfer_shared_libraries (ops, object, annex,
+ readbuf, writebuf,
+ offset, len, xfered_len);
+ case TARGET_OBJECT_MEMORY:
+ {
+ union
+ {
+ PTRACE_TYPE_RET word;
+ gdb_byte byte[sizeof (PTRACE_TYPE_RET)];
+ } buffer;
+ ULONGEST rounded_offset;
+ LONGEST partial_len;
+
+ /* Round the start offset down to the next long word
+ boundary. */
+ rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET);
+
+ /* Since ptrace will transfer a single word starting at that
+ rounded_offset the partial_len needs to be adjusted down to
+ that (remember this function only does a single transfer).
+ Should the required length be even less, adjust it down
+ again. */
+ partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset;
+ if (partial_len > len)
+ partial_len = len;
+
+ if (writebuf)
{
- vp->tstart += vp->tadj;
- vp->tend += vp->tadj;
+ /* If OFFSET:PARTIAL_LEN is smaller than
+ ROUNDED_OFFSET:WORDSIZE then a read/modify write will
+ be needed. Read in the entire word. */
+ if (rounded_offset < offset
+ || (offset + partial_len
+ < rounded_offset + sizeof (PTRACE_TYPE_RET)))
+ {
+ /* Need part of initial word -- fetch it. */
+ if (arch64)
+ buffer.word = rs6000_ptrace64 (PT_READ_I, pid,
+ rounded_offset, 0, NULL);
+ else
+ buffer.word = rs6000_ptrace32 (PT_READ_I, pid,
+ (int *) (uintptr_t)
+ rounded_offset,
+ 0, NULL);
+ }
+
+ /* Copy data to be written over corresponding part of
+ buffer. */
+ memcpy (buffer.byte + (offset - rounded_offset),
+ writebuf, partial_len);
+
+ errno = 0;
+ if (arch64)
+ rs6000_ptrace64 (PT_WRITE_D, pid,
+ rounded_offset, buffer.word, NULL);
+ else
+ rs6000_ptrace32 (PT_WRITE_D, pid,
+ (int *) (uintptr_t) rounded_offset,
+ buffer.word, NULL);
+ if (errno)
+ return TARGET_XFER_EOF;
}
- /* The objfile is only NULL for the exec file. */
- if (vp->objfile == NULL)
- got_exec_file = 1;
-
-#ifdef DONT_RELOCATE_SYMFILE_OBJFILE
- if (vp->objfile == symfile_objfile
- || vp->objfile == NULL)
+ if (readbuf)
{
- ldi->ldinfo_dataorg = 0;
- vp->dstart = (CORE_ADDR) 0;
- vp->dend = ldi->ldinfo_datasize;
+ errno = 0;
+ if (arch64)
+ buffer.word = rs6000_ptrace64 (PT_READ_I, pid,
+ rounded_offset, 0, NULL);
+ else
+ buffer.word = rs6000_ptrace32 (PT_READ_I, pid,
+ (int *)(uintptr_t)rounded_offset,
+ 0, NULL);
+ if (errno)
+ return TARGET_XFER_EOF;
+
+ /* Copy appropriate bytes out of the buffer. */
+ memcpy (readbuf, buffer.byte + (offset - rounded_offset),
+ partial_len);
}
-#endif
-
- /* relocate symbol table(s). */
- vmap_symtab (vp);
- /* There may be more, so we don't break out of the loop. */
+ *xfered_len = (ULONGEST) partial_len;
+ return TARGET_XFER_OK;
}
- /* 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;
+ default:
+ return TARGET_XFER_E_IO;
}
- 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.
-*/
+/* Wait for the child specified by PTID to do something. Return the
+ process ID of the child, or MINUS_ONE_PTID in case of error; store
+ the status in *OURSTATUS. */
-static void
-vmap_exec ()
+static ptid_t
+rs6000_wait (struct target_ops *ops,
+ ptid_t ptid, struct target_waitstatus *ourstatus, int options)
{
- static bfd *execbfd;
- int i;
-
- if (execbfd == exec_bfd)
- return;
+ pid_t pid;
+ int status, save_errno;
- 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++)
+ do
{
- if (STREQ(".text", exec_ops.to_sections[i].the_bfd_section->name))
+ set_sigint_trap ();
+
+ do
{
- exec_ops.to_sections[i].addr += vmap->tstart;
- exec_ops.to_sections[i].endaddr += vmap->tstart;
+ pid = waitpid (ptid_get_pid (ptid), &status, 0);
+ save_errno = errno;
}
- else if (STREQ(".data", exec_ops.to_sections[i].the_bfd_section->name))
+ while (pid == -1 && errno == EINTR);
+
+ clear_sigint_trap ();
+
+ if (pid == -1)
{
- exec_ops.to_sections[i].addr += vmap->dstart;
- exec_ops.to_sections[i].endaddr += vmap->dstart;
+ fprintf_unfiltered (gdb_stderr,
+ _("Child process unexpectedly missing: %s.\n"),
+ safe_strerror (save_errno));
+
+ /* Claim it exited with unknown signal. */
+ ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
+ ourstatus->value.sig = GDB_SIGNAL_UNKNOWN;
+ return inferior_ptid;
}
+
+ /* Ignore terminated detached child processes. */
+ if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid))
+ pid = -1;
}
+ while (pid == -1);
+
+ /* AIX has a couple of strange returns from wait(). */
+
+ /* stop after load" status. */
+ if (status == 0x57c)
+ ourstatus->kind = TARGET_WAITKIND_LOADED;
+ /* signal 0. I have no idea why wait(2) returns with this status word. */
+ else if (status == 0x7f)
+ ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
+ /* A normal waitstatus. Let the usual macros deal with it. */
+ else
+ store_waitstatus (ourstatus, status);
+
+ return pid_to_ptid (pid);
}
\f
-/* xcoff_relocate_symtab - hook for symbol table relocation.
- also reads shared libraries.. */
-void
-xcoff_relocate_symtab (pid)
- unsigned int pid;
-{
-#define MAX_LOAD_SEGS 64 /* maximum number of load segments */
-
- struct ld_info *ldi;
+/* Set the current architecture from the host running GDB. Called when
+ starting a child process. */
- ldi = (void *) alloca(MAX_LOAD_SEGS * sizeof (*ldi));
+static void (*super_create_inferior) (struct target_ops *,
+ const char *exec_file,
+ const std::string &allargs,
+ char **env, int from_tty);
+static void
+rs6000_create_inferior (struct target_ops * ops, const char *exec_file,
+ const std::string &allargs, char **env, int from_tty)
+{
+ enum bfd_architecture arch;
+ unsigned long mach;
+ bfd abfd;
+ struct gdbarch_info info;
- /* 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. */
+ super_create_inferior (ops, exec_file, allargs, env, from_tty);
- usleep (36000);
+ if (__power_rs ())
+ {
+ arch = bfd_arch_rs6000;
+ mach = bfd_mach_rs6k;
+ }
+ else
+ {
+ arch = bfd_arch_powerpc;
+ mach = bfd_mach_ppc;
+ }
- errno = 0;
- ptrace (PT_LDINFO, pid, (PTRACE_ARG3_TYPE) ldi,
- MAX_LOAD_SEGS * sizeof(*ldi), ldi);
- if (errno)
- perror_with_name ("ptrace ldinfo");
+ /* FIXME: schauer/2002-02-25:
+ We don't know if we are executing a 32 or 64 bit executable,
+ and have no way to pass the proper word size to rs6000_gdbarch_init.
+ So we have to avoid switching to a new architecture, if the architecture
+ matches already.
+ Blindly calling rs6000_gdbarch_init used to work in older versions of
+ GDB, as rs6000_gdbarch_init incorrectly used the previous tdep to
+ determine the wordsize. */
+ if (exec_bfd)
+ {
+ const struct bfd_arch_info *exec_bfd_arch_info;
- vmap_ldinfo (ldi);
+ exec_bfd_arch_info = bfd_get_arch_info (exec_bfd);
+ if (arch == exec_bfd_arch_info->arch)
+ return;
+ }
- do {
- /* We are allowed to assume CORE_ADDR == pointer. This code is
- native only. */
- add_text_to_loadinfo ((CORE_ADDR) ldi->ldinfo_textorg,
- (CORE_ADDR) ldi->ldinfo_dataorg);
- } while (ldi->ldinfo_next
- && (ldi = (void *) (ldi->ldinfo_next + (char *) ldi)));
+ bfd_default_set_arch_mach (&abfd, arch, mach);
-#if 0
- /* Now that we've jumbled things around, re-sort them. */
- sort_minimal_symbols ();
-#endif
+ gdbarch_info_init (&info);
+ info.bfd_arch_info = bfd_get_arch_info (&abfd);
+ info.abfd = exec_bfd;
- /* relocate the exec and core sections as well. */
- vmap_exec ();
+ if (!gdbarch_update_p (info))
+ internal_error (__FILE__, __LINE__,
+ _("rs6000_create_inferior: failed "
+ "to select architecture"));
}
\f
-/* Core file stuff. */
-/* Relocate symtabs and read in shared library info, based on symbols
- from the core file. */
+/* Shared Object support. */
-void
-xcoff_relocate_core (target)
- struct target_ops *target;
+/* Return the LdInfo data for the given process. Raises an error
+ if the data could not be obtained.
+
+ The returned value must be deallocated after use. */
+
+static gdb_byte *
+rs6000_ptrace_ldinfo (ptid_t ptid)
{
-/* Offset of member MEMBER in a struct of type TYPE. */
-#ifndef offsetof
-#define offsetof(TYPE, MEMBER) ((int) &((TYPE *)0)->MEMBER)
-#endif
+ const int pid = ptid_get_pid (ptid);
+ int ldi_size = 1024;
+ void *ldi = xmalloc (ldi_size);
+ int rc = -1;
-/* 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
+ while (1)
{
- int i;
- int names_found = 0;
+ if (ARCH64 ())
+ rc = rs6000_ptrace64 (PT_LDINFO, pid, (unsigned long) ldi, ldi_size,
+ NULL);
+ else
+ rc = rs6000_ptrace32 (PT_LDINFO, pid, (int *) ldi, ldi_size, NULL);
- /* Read in everything but the name. */
- if (bfd_get_section_contents (core_bfd, ldinfo_sec, buffer,
- offset, LDINFO_SIZE) == 0)
- goto bfd_err;
+ if (rc != -1)
+ break; /* Success, we got the entire ld_info data. */
- /* 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);
+ if (errno != ENOMEM)
+ perror_with_name (_("ptrace ldinfo"));
- offset += ldip->ldinfo_next;
+ /* ldi is not big enough. Double it and try again. */
+ ldi_size *= 2;
+ ldi = xrealloc (ldi, ldi_size);
+ }
- /* 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;
+ return (gdb_byte *) ldi;
+}
-#ifdef DONT_RELOCATE_SYMFILE_OBJFILE
- if (vp == vmap)
- {
- vp->dstart = (CORE_ADDR) 0;
- vp->dend = ldip->ldinfo_datasize;
- }
-#endif
+/* Implement the to_xfer_partial target_ops method for
+ TARGET_OBJECT_LIBRARIES_AIX objects. */
- if (vp->tadj != 0)
- {
- vp->tstart += vp->tadj;
- vp->tend += vp->tadj;
- }
+static enum target_xfer_status
+rs6000_xfer_shared_libraries
+ (struct target_ops *ops, enum target_object object,
+ const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf,
+ ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
+{
+ gdb_byte *ldi_buf;
+ ULONGEST result;
+ struct cleanup *cleanup;
- /* Unless this is the exec file,
- add our sections to the section table for the core target. */
- if (vp != vmap)
- {
- int count;
- struct section_table *stp;
- int update_coreops;
-
- /* We must update the to_sections field in the core_ops structure
- now to avoid dangling pointer dereferences. */
- update_coreops = core_ops.to_sections == target->to_sections;
-
- count = target->to_sections_end - target->to_sections;
- count += 2;
- target->to_sections = (struct section_table *)
- xrealloc (target->to_sections,
- sizeof (struct section_table) * count);
- target->to_sections_end = target->to_sections + count;
-
- /* Update the to_sections field in the core_ops structure
- if needed. */
- if (update_coreops)
- {
- core_ops.to_sections = target->to_sections;
- core_ops.to_sections_end = target->to_sections_end;
- }
- stp = target->to_sections_end - 2;
-
- /* "Why do we add bfd_section_vma?", I hear you cry.
- Well, the start of the section in the file is actually
- that far into the section as the struct vmap understands it.
- So for text sections, bfd_section_vma tends to be 0x200,
- and if vp->tstart is 0xd0002000, then the first byte of
- the text section on disk corresponds to address 0xd0002200. */
- stp->bfd = vp->bfd;
- stp->the_bfd_section = bfd_get_section_by_name (stp->bfd, ".text");
- stp->addr = bfd_section_vma (stp->bfd, stp->the_bfd_section) + vp->tstart;
- stp->endaddr = bfd_section_vma (stp->bfd, stp->the_bfd_section) + vp->tend;
- stp++;
-
- stp->bfd = vp->bfd;
- stp->the_bfd_section = bfd_get_section_by_name (stp->bfd, ".data");
- stp->addr = bfd_section_vma (stp->bfd, stp->the_bfd_section) + vp->dstart;
- stp->endaddr = bfd_section_vma (stp->bfd, stp->the_bfd_section) + vp->dend;
- }
+ /* This function assumes that it is being run with a live process.
+ Core files are handled via gdbarch. */
+ gdb_assert (target_has_execution);
- vmap_symtab (vp);
+ if (writebuf)
+ return TARGET_XFER_E_IO;
- add_text_to_loadinfo ((CORE_ADDR)ldip->ldinfo_textorg,
- (CORE_ADDR)ldip->ldinfo_dataorg);
- } while (ldip->ldinfo_next != 0);
- vmap_exec ();
- breakpoint_re_set ();
- do_cleanups (old);
-}
+ ldi_buf = rs6000_ptrace_ldinfo (inferior_ptid);
+ gdb_assert (ldi_buf != NULL);
+ cleanup = make_cleanup (xfree, ldi_buf);
+ result = rs6000_aix_ld_info_to_xml (target_gdbarch (), ldi_buf,
+ readbuf, offset, len, 1);
+ xfree (ldi_buf);
-int
-kernel_u_size ()
-{
- return (sizeof (struct user));
+ do_cleanups (cleanup);
+
+ if (result == 0)
+ return TARGET_XFER_EOF;
+ else
+ {
+ *xfered_len = result;
+ return TARGET_XFER_OK;
+ }
}
-\f
-/* Register that we are able to handle rs6000 core file formats. */
-
-static struct core_fns rs6000_core_fns =
-{
- bfd_target_coff_flavour,
- fetch_core_registers,
- NULL
-};
+void _initialize_rs6000_nat (void);
void
-_initialize_core_rs6000 ()
+_initialize_rs6000_nat (void)
{
- add_core_fns (&rs6000_core_fns);
+ struct target_ops *t;
+
+ t = inf_ptrace_target ();
+ t->to_fetch_registers = rs6000_fetch_inferior_registers;
+ t->to_store_registers = rs6000_store_inferior_registers;
+ t->to_xfer_partial = rs6000_xfer_partial;
+
+ super_create_inferior = t->to_create_inferior;
+ t->to_create_inferior = rs6000_create_inferior;
+
+ t->to_wait = rs6000_wait;
+
+ add_target (t);
}