1232 lines
34 KiB
C
1232 lines
34 KiB
C
/* IBM RS/6000 native-dependent code for GDB, the GNU debugger.
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Copyright (C) 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
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1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009, 2010, 2011
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "inferior.h"
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#include "target.h"
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#include "gdbcore.h"
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#include "xcoffsolib.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "libbfd.h" /* For bfd_default_set_arch_mach (FIXME) */
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#include "bfd.h"
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#include "exceptions.h"
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#include "gdb-stabs.h"
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#include "regcache.h"
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#include "arch-utils.h"
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#include "inf-ptrace.h"
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#include "ppc-tdep.h"
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#include "rs6000-tdep.h"
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#include "exec.h"
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#include "observer.h"
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#include "xcoffread.h"
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#include <sys/ptrace.h>
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#include <sys/reg.h>
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <sys/user.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <a.out.h>
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#include <sys/file.h>
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#include "gdb_stat.h"
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#include <sys/core.h>
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#define __LDINFO_PTRACE32__ /* for __ld_info32 */
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#define __LDINFO_PTRACE64__ /* for __ld_info64 */
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#include <sys/ldr.h>
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#include <sys/systemcfg.h>
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/* On AIX4.3+, sys/ldr.h provides different versions of struct ld_info for
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debugging 32-bit and 64-bit processes. Define a typedef and macros for
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accessing fields in the appropriate structures. */
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/* In 32-bit compilation mode (which is the only mode from which ptrace()
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works on 4.3), __ld_info32 is #defined as equivalent to ld_info. */
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#ifdef __ld_info32
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# define ARCH3264
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#endif
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/* Return whether the current architecture is 64-bit. */
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#ifndef ARCH3264
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# define ARCH64() 0
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#else
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# define ARCH64() (register_size (target_gdbarch, 0) == 8)
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#endif
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/* Union of 32-bit and 64-bit versions of ld_info. */
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typedef union {
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#ifndef ARCH3264
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struct ld_info l32;
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struct ld_info l64;
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#else
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struct __ld_info32 l32;
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struct __ld_info64 l64;
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#endif
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} LdInfo;
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/* If compiling with 32-bit and 64-bit debugging capability (e.g. AIX 4.x),
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declare and initialize a variable named VAR suitable for use as the arch64
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parameter to the various LDI_*() macros. */
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#ifndef ARCH3264
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# define ARCH64_DECL(var)
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#else
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# define ARCH64_DECL(var) int var = ARCH64 ()
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#endif
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/* Return LDI's FIELD for a 64-bit process if ARCH64 and for a 32-bit process
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otherwise. This technique only works for FIELDs with the same data type in
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32-bit and 64-bit versions of ld_info. */
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#ifndef ARCH3264
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# define LDI_FIELD(ldi, arch64, field) (ldi)->l32.ldinfo_##field
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#else
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# define LDI_FIELD(ldi, arch64, field) \
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(arch64 ? (ldi)->l64.ldinfo_##field : (ldi)->l32.ldinfo_##field)
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#endif
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/* Return various LDI fields for a 64-bit process if ARCH64 and for a 32-bit
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process otherwise. */
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#define LDI_NEXT(ldi, arch64) LDI_FIELD(ldi, arch64, next)
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#define LDI_FD(ldi, arch64) LDI_FIELD(ldi, arch64, fd)
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#define LDI_FILENAME(ldi, arch64) LDI_FIELD(ldi, arch64, filename)
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extern struct vmap *map_vmap (bfd * bf, bfd * arch);
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static void vmap_exec (void);
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static void vmap_ldinfo (LdInfo *);
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static struct vmap *add_vmap (LdInfo *);
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static int objfile_symbol_add (void *);
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static void vmap_symtab (struct vmap *);
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static void exec_one_dummy_insn (struct regcache *);
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extern void fixup_breakpoints (CORE_ADDR low, CORE_ADDR high, CORE_ADDR delta);
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/* Given REGNO, a gdb register number, return the corresponding
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number suitable for use as a ptrace() parameter. Return -1 if
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there's no suitable mapping. Also, set the int pointed to by
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ISFLOAT to indicate whether REGNO is a floating point register. */
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static int
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regmap (struct gdbarch *gdbarch, int regno, int *isfloat)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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*isfloat = 0;
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if (tdep->ppc_gp0_regnum <= regno
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&& regno < tdep->ppc_gp0_regnum + ppc_num_gprs)
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return regno;
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else if (tdep->ppc_fp0_regnum >= 0
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&& tdep->ppc_fp0_regnum <= regno
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&& regno < tdep->ppc_fp0_regnum + ppc_num_fprs)
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{
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*isfloat = 1;
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return regno - tdep->ppc_fp0_regnum + FPR0;
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}
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else if (regno == gdbarch_pc_regnum (gdbarch))
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return IAR;
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else if (regno == tdep->ppc_ps_regnum)
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return MSR;
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else if (regno == tdep->ppc_cr_regnum)
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return CR;
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else if (regno == tdep->ppc_lr_regnum)
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return LR;
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else if (regno == tdep->ppc_ctr_regnum)
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return CTR;
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else if (regno == tdep->ppc_xer_regnum)
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return XER;
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else if (tdep->ppc_fpscr_regnum >= 0
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&& regno == tdep->ppc_fpscr_regnum)
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return FPSCR;
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else if (tdep->ppc_mq_regnum >= 0 && regno == tdep->ppc_mq_regnum)
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return MQ;
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else
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return -1;
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}
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/* Call ptrace(REQ, ID, ADDR, DATA, BUF). */
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static int
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rs6000_ptrace32 (int req, int id, int *addr, int data, int *buf)
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{
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int ret = ptrace (req, id, (int *)addr, data, buf);
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#if 0
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printf ("rs6000_ptrace32 (%d, %d, 0x%x, %08x, 0x%x) = 0x%x\n",
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req, id, (unsigned int)addr, data, (unsigned int)buf, ret);
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#endif
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return ret;
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}
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/* Call ptracex(REQ, ID, ADDR, DATA, BUF). */
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static int
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rs6000_ptrace64 (int req, int id, long long addr, int data, void *buf)
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{
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#ifdef ARCH3264
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int ret = ptracex (req, id, addr, data, buf);
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#else
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int ret = 0;
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#endif
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#if 0
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printf ("rs6000_ptrace64 (%d, %d, %s, %08x, 0x%x) = 0x%x\n",
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req, id, hex_string (addr), data, (unsigned int)buf, ret);
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#endif
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return ret;
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}
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/* Fetch register REGNO from the inferior. */
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static void
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fetch_register (struct regcache *regcache, int regno)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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int addr[MAX_REGISTER_SIZE];
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int nr, isfloat;
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/* Retrieved values may be -1, so infer errors from errno. */
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errno = 0;
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nr = regmap (gdbarch, regno, &isfloat);
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/* Floating-point registers. */
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if (isfloat)
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rs6000_ptrace32 (PT_READ_FPR, PIDGET (inferior_ptid), addr, nr, 0);
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/* Bogus register number. */
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else if (nr < 0)
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{
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if (regno >= gdbarch_num_regs (gdbarch))
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fprintf_unfiltered (gdb_stderr,
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"gdb error: register no %d not implemented.\n",
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regno);
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return;
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}
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/* Fixed-point registers. */
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else
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{
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if (!ARCH64 ())
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*addr = rs6000_ptrace32 (PT_READ_GPR, PIDGET (inferior_ptid), (int *)nr, 0, 0);
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else
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{
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/* PT_READ_GPR requires the buffer parameter to point to long long,
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even if the register is really only 32 bits. */
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long long buf;
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rs6000_ptrace64 (PT_READ_GPR, PIDGET (inferior_ptid), nr, 0, &buf);
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if (register_size (gdbarch, regno) == 8)
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memcpy (addr, &buf, 8);
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else
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*addr = buf;
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}
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}
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if (!errno)
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regcache_raw_supply (regcache, regno, (char *) addr);
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else
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{
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#if 0
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/* FIXME: this happens 3 times at the start of each 64-bit program. */
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perror ("ptrace read");
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#endif
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errno = 0;
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}
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}
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/* Store register REGNO back into the inferior. */
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static void
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store_register (struct regcache *regcache, int regno)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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int addr[MAX_REGISTER_SIZE];
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int nr, isfloat;
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/* Fetch the register's value from the register cache. */
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regcache_raw_collect (regcache, regno, addr);
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/* -1 can be a successful return value, so infer errors from errno. */
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errno = 0;
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nr = regmap (gdbarch, regno, &isfloat);
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/* Floating-point registers. */
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if (isfloat)
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rs6000_ptrace32 (PT_WRITE_FPR, PIDGET (inferior_ptid), addr, nr, 0);
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/* Bogus register number. */
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else if (nr < 0)
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{
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if (regno >= gdbarch_num_regs (gdbarch))
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fprintf_unfiltered (gdb_stderr,
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"gdb error: register no %d not implemented.\n",
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regno);
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}
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/* Fixed-point registers. */
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else
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{
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if (regno == gdbarch_sp_regnum (gdbarch))
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/* Execute one dummy instruction (which is a breakpoint) in inferior
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process to give kernel a chance to do internal housekeeping.
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Otherwise the following ptrace(2) calls will mess up user stack
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since kernel will get confused about the bottom of the stack
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(%sp). */
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exec_one_dummy_insn (regcache);
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/* The PT_WRITE_GPR operation is rather odd. For 32-bit inferiors,
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the register's value is passed by value, but for 64-bit inferiors,
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the address of a buffer containing the value is passed. */
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if (!ARCH64 ())
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rs6000_ptrace32 (PT_WRITE_GPR, PIDGET (inferior_ptid), (int *)nr, *addr, 0);
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else
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{
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/* PT_WRITE_GPR requires the buffer parameter to point to an 8-byte
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area, even if the register is really only 32 bits. */
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long long buf;
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if (register_size (gdbarch, regno) == 8)
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memcpy (&buf, addr, 8);
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else
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buf = *addr;
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rs6000_ptrace64 (PT_WRITE_GPR, PIDGET (inferior_ptid), nr, 0, &buf);
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}
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}
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if (errno)
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{
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perror ("ptrace write");
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errno = 0;
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}
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}
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/* Read from the inferior all registers if REGNO == -1 and just register
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REGNO otherwise. */
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static void
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rs6000_fetch_inferior_registers (struct target_ops *ops,
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struct regcache *regcache, int regno)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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if (regno != -1)
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fetch_register (regcache, regno);
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else
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* Read 32 general purpose registers. */
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for (regno = tdep->ppc_gp0_regnum;
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regno < tdep->ppc_gp0_regnum + ppc_num_gprs;
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regno++)
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{
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fetch_register (regcache, regno);
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}
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/* Read general purpose floating point registers. */
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if (tdep->ppc_fp0_regnum >= 0)
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for (regno = 0; regno < ppc_num_fprs; regno++)
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fetch_register (regcache, tdep->ppc_fp0_regnum + regno);
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/* Read special registers. */
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fetch_register (regcache, gdbarch_pc_regnum (gdbarch));
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fetch_register (regcache, tdep->ppc_ps_regnum);
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fetch_register (regcache, tdep->ppc_cr_regnum);
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fetch_register (regcache, tdep->ppc_lr_regnum);
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fetch_register (regcache, tdep->ppc_ctr_regnum);
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fetch_register (regcache, tdep->ppc_xer_regnum);
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if (tdep->ppc_fpscr_regnum >= 0)
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fetch_register (regcache, tdep->ppc_fpscr_regnum);
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if (tdep->ppc_mq_regnum >= 0)
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fetch_register (regcache, tdep->ppc_mq_regnum);
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}
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}
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/* Store our register values back into the inferior.
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If REGNO is -1, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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static void
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rs6000_store_inferior_registers (struct target_ops *ops,
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struct regcache *regcache, int regno)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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if (regno != -1)
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store_register (regcache, regno);
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else
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{
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||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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||
|
||
/* Write general purpose registers first. */
|
||
for (regno = tdep->ppc_gp0_regnum;
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regno < tdep->ppc_gp0_regnum + ppc_num_gprs;
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||
regno++)
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{
|
||
store_register (regcache, regno);
|
||
}
|
||
|
||
/* 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);
|
||
}
|
||
}
|
||
|
||
|
||
/* Attempt a transfer all LEN bytes starting at OFFSET between the
|
||
inferior's OBJECT:ANNEX space and GDB's READBUF/WRITEBUF buffer.
|
||
Return the number of bytes actually transferred. */
|
||
|
||
static LONGEST
|
||
rs6000_xfer_partial (struct target_ops *ops, enum target_object object,
|
||
const char *annex, gdb_byte *readbuf,
|
||
const gdb_byte *writebuf,
|
||
ULONGEST offset, LONGEST len)
|
||
{
|
||
pid_t pid = ptid_get_pid (inferior_ptid);
|
||
int arch64 = ARCH64 ();
|
||
|
||
switch (object)
|
||
{
|
||
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)
|
||
{
|
||
/* 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 0;
|
||
}
|
||
|
||
if (readbuf)
|
||
{
|
||
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 0;
|
||
|
||
/* Copy appropriate bytes out of the buffer. */
|
||
memcpy (readbuf, buffer.byte + (offset - rounded_offset),
|
||
partial_len);
|
||
}
|
||
|
||
return partial_len;
|
||
}
|
||
|
||
default:
|
||
return -1;
|
||
}
|
||
}
|
||
|
||
/* 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 ptid_t
|
||
rs6000_wait (struct target_ops *ops,
|
||
ptid_t ptid, struct target_waitstatus *ourstatus, int options)
|
||
{
|
||
pid_t pid;
|
||
int status, save_errno;
|
||
|
||
do
|
||
{
|
||
set_sigint_trap ();
|
||
|
||
do
|
||
{
|
||
pid = waitpid (ptid_get_pid (ptid), &status, 0);
|
||
save_errno = errno;
|
||
}
|
||
while (pid == -1 && errno == EINTR);
|
||
|
||
clear_sigint_trap ();
|
||
|
||
if (pid == -1)
|
||
{
|
||
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 = TARGET_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);
|
||
}
|
||
|
||
/* 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 (struct regcache *regcache)
|
||
{
|
||
#define DUMMY_INSN_ADDR AIX_TEXT_SEGMENT_BASE+0x200
|
||
|
||
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
||
int ret, status, pid;
|
||
CORE_ADDR prev_pc;
|
||
void *bp;
|
||
|
||
/* We plant one dummy breakpoint into DUMMY_INSN_ADDR address. We
|
||
assume that this address will never be executed again by the real
|
||
code. */
|
||
|
||
bp = deprecated_insert_raw_breakpoint (gdbarch, NULL, DUMMY_INSN_ADDR);
|
||
|
||
/* 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 = regcache_read_pc (regcache);
|
||
regcache_write_pc (regcache, DUMMY_INSN_ADDR);
|
||
if (ARCH64 ())
|
||
ret = rs6000_ptrace64 (PT_CONTINUE, PIDGET (inferior_ptid), 1, 0, NULL);
|
||
else
|
||
ret = rs6000_ptrace32 (PT_CONTINUE, PIDGET (inferior_ptid), (int *)1, 0, NULL);
|
||
|
||
if (ret != 0)
|
||
perror ("pt_continue");
|
||
|
||
do
|
||
{
|
||
pid = wait (&status);
|
||
}
|
||
while (pid != PIDGET (inferior_ptid));
|
||
|
||
regcache_write_pc (regcache, prev_pc);
|
||
deprecated_remove_raw_breakpoint (gdbarch, bp);
|
||
}
|
||
|
||
|
||
/* Copy information about text and data sections from LDI to VP for a 64-bit
|
||
process if ARCH64 and for a 32-bit process otherwise. */
|
||
|
||
static void
|
||
vmap_secs (struct vmap *vp, LdInfo *ldi, int arch64)
|
||
{
|
||
if (arch64)
|
||
{
|
||
vp->tstart = (CORE_ADDR) ldi->l64.ldinfo_textorg;
|
||
vp->tend = vp->tstart + ldi->l64.ldinfo_textsize;
|
||
vp->dstart = (CORE_ADDR) ldi->l64.ldinfo_dataorg;
|
||
vp->dend = vp->dstart + ldi->l64.ldinfo_datasize;
|
||
}
|
||
else
|
||
{
|
||
vp->tstart = (unsigned long) ldi->l32.ldinfo_textorg;
|
||
vp->tend = vp->tstart + ldi->l32.ldinfo_textsize;
|
||
vp->dstart = (unsigned long) ldi->l32.ldinfo_dataorg;
|
||
vp->dend = vp->dstart + ldi->l32.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;
|
||
}
|
||
|
||
/* handle symbol translation on vmapping */
|
||
|
||
static void
|
||
vmap_symtab (struct vmap *vp)
|
||
{
|
||
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;
|
||
}
|
||
else if (!vp->loaded)
|
||
/* If symbols are not yet loaded, offsets are not yet valid. */
|
||
return;
|
||
|
||
new_offsets =
|
||
(struct section_offsets *)
|
||
alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections));
|
||
|
||
for (i = 0; i < objfile->num_sections; ++i)
|
||
new_offsets->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. */
|
||
new_offsets->offsets[SECT_OFF_TEXT (objfile)] = vp->tstart - vp->tvma;
|
||
new_offsets->offsets[SECT_OFF_DATA (objfile)] = vp->dstart - vp->dvma;
|
||
new_offsets->offsets[SECT_OFF_BSS (objfile)] = vp->dstart - vp->dvma;
|
||
|
||
objfile_relocate (objfile, new_offsets);
|
||
}
|
||
|
||
/* Add symbols for an objfile. */
|
||
|
||
static int
|
||
objfile_symbol_add (void *arg)
|
||
{
|
||
struct objfile *obj = (struct objfile *) arg;
|
||
|
||
syms_from_objfile (obj, NULL, 0, 0, 0);
|
||
new_symfile_objfile (obj, 0);
|
||
return 1;
|
||
}
|
||
|
||
/* Add symbols for a vmap. Return zero upon error. */
|
||
|
||
int
|
||
vmap_add_symbols (struct vmap *vp)
|
||
{
|
||
if (catch_errors (objfile_symbol_add, vp->objfile,
|
||
"Error while reading shared library symbols:\n",
|
||
RETURN_MASK_ALL))
|
||
{
|
||
/* Note this is only done if symbol reading was successful. */
|
||
vp->loaded = 1;
|
||
vmap_symtab (vp);
|
||
return 1;
|
||
}
|
||
return 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. */
|
||
|
||
static struct vmap *
|
||
add_vmap (LdInfo *ldi)
|
||
{
|
||
bfd *abfd, *last;
|
||
char *mem, *objname, *filename;
|
||
struct objfile *obj;
|
||
struct vmap *vp;
|
||
int fd;
|
||
ARCH64_DECL (arch64);
|
||
|
||
/* 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. */
|
||
|
||
filename = LDI_FILENAME (ldi, arch64);
|
||
mem = filename + strlen (filename) + 1;
|
||
mem = xstrdup (mem);
|
||
objname = xstrdup (filename);
|
||
|
||
fd = LDI_FD (ldi, arch64);
|
||
if (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, fd);
|
||
if (!abfd)
|
||
{
|
||
warning (_("Could not open `%s' as an executable file: %s"),
|
||
objname, bfd_errmsg (bfd_get_error ()));
|
||
return NULL;
|
||
}
|
||
|
||
/* 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 (strcmp (mem, last->filename) == 0)
|
||
break;
|
||
|
||
if (!last)
|
||
{
|
||
warning (_("\"%s\": member \"%s\" missing."), objname, mem);
|
||
bfd_close (abfd);
|
||
return NULL;
|
||
}
|
||
|
||
if (!bfd_check_format (last, bfd_object))
|
||
{
|
||
warning (_("\"%s\": member \"%s\" not in executable format: %s."),
|
||
objname, mem, bfd_errmsg (bfd_get_error ()));
|
||
bfd_close (last);
|
||
bfd_close (abfd);
|
||
return NULL;
|
||
}
|
||
|
||
vp = map_vmap (last, abfd);
|
||
}
|
||
else
|
||
{
|
||
warning (_("\"%s\": not in executable format: %s."),
|
||
objname, bfd_errmsg (bfd_get_error ()));
|
||
bfd_close (abfd);
|
||
return NULL;
|
||
}
|
||
obj = allocate_objfile (vp->bfd, 0);
|
||
vp->objfile = obj;
|
||
|
||
/* Always add symbols for the main objfile. */
|
||
if (vp == vmap || auto_solib_add)
|
||
vmap_add_symbols (vp);
|
||
return vp;
|
||
}
|
||
|
||
/* update VMAP info with ldinfo() information
|
||
Input is ptr to ldinfo() results. */
|
||
|
||
static void
|
||
vmap_ldinfo (LdInfo *ldi)
|
||
{
|
||
struct stat ii, vi;
|
||
struct vmap *vp;
|
||
int got_one, retried;
|
||
int got_exec_file = 0;
|
||
uint next;
|
||
int arch64 = ARCH64 ();
|
||
|
||
/* 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_FILENAME (ldi, arch64);
|
||
char *memb = name + strlen (name) + 1;
|
||
int fd = LDI_FD (ldi, arch64);
|
||
|
||
retried = 0;
|
||
|
||
if (fstat (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, 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] == '/' && strcmp (name, vp->name) != 0)
|
||
|| (memb[0] && strcmp (memb, vp->member) != 0))
|
||
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 (fd);
|
||
|
||
++got_one;
|
||
|
||
/* Found a corresponding VMAP. Remap! */
|
||
|
||
vmap_secs (vp, ldi, arch64);
|
||
|
||
/* The objfile is only NULL for the exec file. */
|
||
if (vp->objfile == NULL)
|
||
got_exec_file = 1;
|
||
|
||
/* relocate symbol table(s). */
|
||
vmap_symtab (vp);
|
||
|
||
/* Announce new object files. Doing this after symbol relocation
|
||
makes aix-thread.c's job easier. */
|
||
if (vp->objfile)
|
||
observer_notify_new_objfile (vp->objfile);
|
||
|
||
/* 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 ((next = LDI_NEXT (ldi, arch64))
|
||
&& (ldi = (void *) (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 (_("Symbol file %s\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)."),
|
||
symfile_objfile->name);
|
||
free_objfile (symfile_objfile);
|
||
gdb_assert (symfile_objfile == NULL);
|
||
}
|
||
breakpoint_re_set ();
|
||
}
|
||
|
||
/* 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 (void)
|
||
{
|
||
static bfd *execbfd;
|
||
int i;
|
||
struct target_section_table *table = target_get_section_table (&exec_ops);
|
||
|
||
if (execbfd == exec_bfd)
|
||
return;
|
||
|
||
execbfd = exec_bfd;
|
||
|
||
if (!vmap || !table->sections)
|
||
error (_("vmap_exec: vmap or table->sections == 0."));
|
||
|
||
for (i = 0; &table->sections[i] < table->sections_end; i++)
|
||
{
|
||
if (strcmp (".text", table->sections[i].the_bfd_section->name) == 0)
|
||
{
|
||
table->sections[i].addr += vmap->tstart - vmap->tvma;
|
||
table->sections[i].endaddr += vmap->tstart - vmap->tvma;
|
||
}
|
||
else if (strcmp (".data", table->sections[i].the_bfd_section->name) == 0)
|
||
{
|
||
table->sections[i].addr += vmap->dstart - vmap->dvma;
|
||
table->sections[i].endaddr += vmap->dstart - vmap->dvma;
|
||
}
|
||
else if (strcmp (".bss", table->sections[i].the_bfd_section->name) == 0)
|
||
{
|
||
table->sections[i].addr += vmap->dstart - vmap->dvma;
|
||
table->sections[i].endaddr += vmap->dstart - vmap->dvma;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Set the current architecture from the host running GDB. Called when
|
||
starting a child process. */
|
||
|
||
static void (*super_create_inferior) (struct target_ops *,char *exec_file,
|
||
char *allargs, char **env, int from_tty);
|
||
static void
|
||
rs6000_create_inferior (struct target_ops * ops, char *exec_file,
|
||
char *allargs, char **env, int from_tty)
|
||
{
|
||
enum bfd_architecture arch;
|
||
unsigned long mach;
|
||
bfd abfd;
|
||
struct gdbarch_info info;
|
||
|
||
super_create_inferior (ops, exec_file, allargs, env, from_tty);
|
||
|
||
if (__power_rs ())
|
||
{
|
||
arch = bfd_arch_rs6000;
|
||
mach = bfd_mach_rs6k;
|
||
}
|
||
else
|
||
{
|
||
arch = bfd_arch_powerpc;
|
||
mach = bfd_mach_ppc;
|
||
}
|
||
|
||
/* 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;
|
||
|
||
exec_bfd_arch_info = bfd_get_arch_info (exec_bfd);
|
||
if (arch == exec_bfd_arch_info->arch)
|
||
return;
|
||
}
|
||
|
||
bfd_default_set_arch_mach (&abfd, arch, mach);
|
||
|
||
gdbarch_info_init (&info);
|
||
info.bfd_arch_info = bfd_get_arch_info (&abfd);
|
||
info.abfd = exec_bfd;
|
||
|
||
if (!gdbarch_update_p (info))
|
||
internal_error (__FILE__, __LINE__,
|
||
_("rs6000_create_inferior: failed to select architecture"));
|
||
}
|
||
|
||
|
||
/* xcoff_relocate_symtab - hook for symbol table relocation.
|
||
|
||
This is only applicable to live processes, and is a no-op when
|
||
debugging a core file. */
|
||
|
||
void
|
||
xcoff_relocate_symtab (unsigned int pid)
|
||
{
|
||
int load_segs = 64; /* number of load segments */
|
||
int rc;
|
||
LdInfo *ldi = NULL;
|
||
int arch64 = ARCH64 ();
|
||
int ldisize = arch64 ? sizeof (ldi->l64) : sizeof (ldi->l32);
|
||
int size;
|
||
|
||
/* Nothing to do if we are debugging a core file. */
|
||
if (!target_has_execution)
|
||
return;
|
||
|
||
do
|
||
{
|
||
size = load_segs * ldisize;
|
||
ldi = (void *) xrealloc (ldi, size);
|
||
|
||
#if 0
|
||
/* 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);
|
||
#endif
|
||
|
||
if (arch64)
|
||
rc = rs6000_ptrace64 (PT_LDINFO, pid, (unsigned long) ldi, size, NULL);
|
||
else
|
||
rc = rs6000_ptrace32 (PT_LDINFO, pid, (int *) ldi, size, NULL);
|
||
|
||
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)
|
||
xfree (ldi);
|
||
}
|
||
|
||
/* Core file stuff. */
|
||
|
||
/* Relocate symtabs and read in shared library info, based on symbols
|
||
from the core file. */
|
||
|
||
void
|
||
xcoff_relocate_core (struct target_ops *target)
|
||
{
|
||
struct bfd_section *ldinfo_sec;
|
||
int offset = 0;
|
||
LdInfo *ldi;
|
||
struct vmap *vp;
|
||
int arch64 = ARCH64 ();
|
||
|
||
/* Size of a struct ld_info except for the variable-length filename. */
|
||
int nonfilesz = (int)LDI_FILENAME ((LdInfo *)0, arch64);
|
||
|
||
/* Allocated size of buffer. */
|
||
int buffer_size = nonfilesz;
|
||
char *buffer = xmalloc (buffer_size);
|
||
struct cleanup *old = make_cleanup (free_current_contents, &buffer);
|
||
|
||
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, nonfilesz) == 0)
|
||
goto bfd_err;
|
||
|
||
/* Now the name. */
|
||
i = nonfilesz;
|
||
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);
|
||
|
||
ldi = (LdInfo *) buffer;
|
||
|
||
/* Can't use a file descriptor from the core file; need to open it. */
|
||
if (arch64)
|
||
ldi->l64.ldinfo_fd = -1;
|
||
else
|
||
ldi->l32.ldinfo_fd = -1;
|
||
|
||
/* The first ldinfo is for the exec file, allocated elsewhere. */
|
||
if (offset == 0 && vmap != NULL)
|
||
vp = vmap;
|
||
else
|
||
vp = add_vmap (ldi);
|
||
|
||
/* Process next shared library upon error. */
|
||
offset += LDI_NEXT (ldi, arch64);
|
||
if (vp == NULL)
|
||
continue;
|
||
|
||
vmap_secs (vp, ldi, arch64);
|
||
|
||
/* Unless this is the exec file,
|
||
add our sections to the section table for the core target. */
|
||
if (vp != vmap)
|
||
{
|
||
struct target_section *stp;
|
||
|
||
stp = deprecated_core_resize_section_table (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);
|
||
|
||
if (vp != vmap && vp->objfile)
|
||
observer_notify_new_objfile (vp->objfile);
|
||
}
|
||
while (LDI_NEXT (ldi, arch64) != 0);
|
||
vmap_exec ();
|
||
breakpoint_re_set ();
|
||
do_cleanups (old);
|
||
}
|
||
|
||
/* 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 (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 + xcoff_get_toc_offset (vp->objfile == NULL
|
||
? symfile_objfile
|
||
: vp->objfile);
|
||
}
|
||
}
|
||
error (_("Unable to find TOC entry for pc %s."), hex_string (pc));
|
||
}
|
||
|
||
|
||
void
|
||
_initialize_rs6000_nat (void)
|
||
{
|
||
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);
|
||
|
||
/* Initialize hook in rs6000-tdep.c for determining the TOC address
|
||
when calling functions in the inferior. */
|
||
rs6000_find_toc_address_hook = find_toc_address;
|
||
}
|