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jeremybenn |
/* Native-dependent code for GNU/Linux i386.
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Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
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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 "gdbcore.h"
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#include "regcache.h"
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#include "target.h"
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#include "linux-nat.h"
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#include "gdb_assert.h"
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#include "gdb_string.h"
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#include <sys/ptrace.h>
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#include <sys/user.h>
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#include <sys/procfs.h>
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#ifdef HAVE_SYS_REG_H
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#include <sys/reg.h>
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#endif
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#ifndef ORIG_EAX
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#define ORIG_EAX -1
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#endif
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#ifdef HAVE_SYS_DEBUGREG_H
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#include <sys/debugreg.h>
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#endif
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#ifndef DR_FIRSTADDR
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#define DR_FIRSTADDR 0
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#endif
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#ifndef DR_LASTADDR
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#define DR_LASTADDR 3
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#endif
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#ifndef DR_STATUS
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#define DR_STATUS 6
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#endif
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#ifndef DR_CONTROL
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#define DR_CONTROL 7
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#endif
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/* Prototypes for supply_gregset etc. */
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#include "gregset.h"
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#include "i387-tdep.h"
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#include "i386-tdep.h"
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#include "i386-linux-tdep.h"
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/* Defines ps_err_e, struct ps_prochandle. */
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#include "gdb_proc_service.h"
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/* The register sets used in GNU/Linux ELF core-dumps are identical to
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the register sets in `struct user' that is used for a.out
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core-dumps, and is also used by `ptrace'. The corresponding types
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are `elf_gregset_t' for the general-purpose registers (with
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`elf_greg_t' the type of a single GP register) and `elf_fpregset_t'
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for the floating-point registers.
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Those types used to be available under the names `gregset_t' and
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`fpregset_t' too, and this file used those names in the past. But
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those names are now used for the register sets used in the
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`mcontext_t' type, and have a different size and layout. */
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/* Mapping between the general-purpose registers in `struct user'
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format and GDB's register array layout. */
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static int regmap[] =
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{
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EAX, ECX, EDX, EBX,
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UESP, EBP, ESI, EDI,
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EIP, EFL, CS, SS,
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DS, ES, FS, GS,
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-1, -1, -1, -1, /* st0, st1, st2, st3 */
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-1, -1, -1, -1, /* st4, st5, st6, st7 */
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-1, -1, -1, -1, /* fctrl, fstat, ftag, fiseg */
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-1, -1, -1, -1, /* fioff, foseg, fooff, fop */
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-1, -1, -1, -1, /* xmm0, xmm1, xmm2, xmm3 */
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-1, -1, -1, -1, /* xmm4, xmm5, xmm6, xmm6 */
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-1, /* mxcsr */
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ORIG_EAX
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};
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/* Which ptrace request retrieves which registers?
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These apply to the corresponding SET requests as well. */
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#define GETREGS_SUPPLIES(regno) \
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((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM)
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#define GETFPXREGS_SUPPLIES(regno) \
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(I386_ST0_REGNUM <= (regno) && (regno) < I386_SSE_NUM_REGS)
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/* Does the current host support the GETREGS request? */
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int have_ptrace_getregs =
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#ifdef HAVE_PTRACE_GETREGS
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1
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#else
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#endif
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;
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/* Does the current host support the GETFPXREGS request? The header
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file may or may not define it, and even if it is defined, the
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kernel will return EIO if it's running on a pre-SSE processor.
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My instinct is to attach this to some architecture- or
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target-specific data structure, but really, a particular GDB
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process can only run on top of one kernel at a time. So it's okay
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for this to be a simple variable. */
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int have_ptrace_getfpxregs =
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#ifdef HAVE_PTRACE_GETFPXREGS
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1
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#else
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#endif
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;
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/* Accessing registers through the U area, one at a time. */
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/* Fetch one register. */
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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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int tid;
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int val;
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gdb_assert (!have_ptrace_getregs);
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if (regmap[regno] == -1)
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{
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regcache_raw_supply (regcache, regno, NULL);
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return;
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}
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/* GNU/Linux LWP ID's are process ID's. */
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tid = TIDGET (inferior_ptid);
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if (tid == 0)
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tid = PIDGET (inferior_ptid); /* Not a threaded program. */
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errno = 0;
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val = ptrace (PTRACE_PEEKUSER, tid, 4 * regmap[regno], 0);
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if (errno != 0)
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error (_("Couldn't read register %s (#%d): %s."),
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gdbarch_register_name (get_regcache_arch (regcache), regno),
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regno, safe_strerror (errno));
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regcache_raw_supply (regcache, regno, &val);
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}
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/* Store one register. */
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static void
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store_register (const struct regcache *regcache, int regno)
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{
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int tid;
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int val;
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gdb_assert (!have_ptrace_getregs);
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if (regmap[regno] == -1)
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return;
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/* GNU/Linux LWP ID's are process ID's. */
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tid = TIDGET (inferior_ptid);
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if (tid == 0)
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tid = PIDGET (inferior_ptid); /* Not a threaded program. */
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errno = 0;
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regcache_raw_collect (regcache, regno, &val);
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ptrace (PTRACE_POKEUSER, tid, 4 * regmap[regno], val);
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if (errno != 0)
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error (_("Couldn't write register %s (#%d): %s."),
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gdbarch_register_name (get_regcache_arch (regcache), regno),
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regno, safe_strerror (errno));
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}
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/* Transfering the general-purpose registers between GDB, inferiors
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and core files. */
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/* Fill GDB's register array with the general-purpose register values
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in *GREGSETP. */
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void
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supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp)
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{
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const elf_greg_t *regp = (const elf_greg_t *) gregsetp;
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int i;
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for (i = 0; i < I386_NUM_GREGS; i++)
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regcache_raw_supply (regcache, i, regp + regmap[i]);
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if (I386_LINUX_ORIG_EAX_REGNUM
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< gdbarch_num_regs (get_regcache_arch (regcache)))
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regcache_raw_supply (regcache, I386_LINUX_ORIG_EAX_REGNUM,
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regp + ORIG_EAX);
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}
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/* Fill register REGNO (if it is a general-purpose register) in
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*GREGSETPS with the value in GDB's register array. If REGNO is -1,
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do this for all registers. */
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void
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fill_gregset (const struct regcache *regcache,
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elf_gregset_t *gregsetp, int regno)
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{
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elf_greg_t *regp = (elf_greg_t *) gregsetp;
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int i;
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for (i = 0; i < I386_NUM_GREGS; i++)
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if (regno == -1 || regno == i)
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regcache_raw_collect (regcache, i, regp + regmap[i]);
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if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM)
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&& I386_LINUX_ORIG_EAX_REGNUM
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< gdbarch_num_regs (get_regcache_arch (regcache)))
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regcache_raw_collect (regcache, I386_LINUX_ORIG_EAX_REGNUM,
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regp + ORIG_EAX);
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}
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#ifdef HAVE_PTRACE_GETREGS
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/* Fetch all general-purpose registers from process/thread TID and
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store their values in GDB's register array. */
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static void
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fetch_regs (struct regcache *regcache, int tid)
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{
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elf_gregset_t regs;
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elf_gregset_t *regs_p = ®s;
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if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
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{
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if (errno == EIO)
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{
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/* The kernel we're running on doesn't support the GETREGS
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request. Reset `have_ptrace_getregs'. */
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have_ptrace_getregs = 0;
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return;
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}
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perror_with_name (_("Couldn't get registers"));
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}
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supply_gregset (regcache, (const elf_gregset_t *) regs_p);
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}
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/* Store all valid general-purpose registers in GDB's register array
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into the process/thread specified by TID. */
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static void
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store_regs (const struct regcache *regcache, int tid, int regno)
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{
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elf_gregset_t regs;
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if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
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perror_with_name (_("Couldn't get registers"));
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fill_gregset (regcache, ®s, regno);
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if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0)
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perror_with_name (_("Couldn't write registers"));
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}
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#else
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static void fetch_regs (struct regcache *regcache, int tid) {}
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static void store_regs (const struct regcache *regcache, int tid, int regno) {}
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#endif
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/* Transfering floating-point registers between GDB, inferiors and cores. */
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/* Fill GDB's register array with the floating-point register values in
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*FPREGSETP. */
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297 |
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void
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supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp)
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{
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i387_supply_fsave (regcache, -1, fpregsetp);
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}
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302 |
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/* Fill register REGNO (if it is a floating-point register) in
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*FPREGSETP with the value in GDB's register array. If REGNO is -1,
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do this for all registers. */
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306 |
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307 |
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void
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fill_fpregset (const struct regcache *regcache,
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elf_fpregset_t *fpregsetp, int regno)
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{
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311 |
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i387_collect_fsave (regcache, regno, fpregsetp);
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}
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313 |
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314 |
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#ifdef HAVE_PTRACE_GETREGS
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316 |
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/* Fetch all floating-point registers from process/thread TID and store
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thier values in GDB's register array. */
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318 |
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319 |
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static void
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320 |
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fetch_fpregs (struct regcache *regcache, int tid)
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321 |
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{
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322 |
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elf_fpregset_t fpregs;
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323 |
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324 |
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if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
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325 |
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perror_with_name (_("Couldn't get floating point status"));
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326 |
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327 |
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supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs);
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}
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329 |
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330 |
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/* Store all valid floating-point registers in GDB's register array
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into the process/thread specified by TID. */
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332 |
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333 |
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static void
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store_fpregs (const struct regcache *regcache, int tid, int regno)
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{
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336 |
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elf_fpregset_t fpregs;
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337 |
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338 |
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if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
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339 |
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perror_with_name (_("Couldn't get floating point status"));
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340 |
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341 |
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fill_fpregset (regcache, &fpregs, regno);
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342 |
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343 |
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if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0)
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344 |
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perror_with_name (_("Couldn't write floating point status"));
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}
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346 |
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347 |
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#else
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348 |
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349 |
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static void fetch_fpregs (struct regcache *regcache, int tid) {}
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350 |
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static void store_fpregs (const struct regcache *regcache, int tid, int regno) {}
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351 |
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352 |
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#endif
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353 |
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354 |
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355 |
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/* Transfering floating-point and SSE registers to and from GDB. */
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356 |
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357 |
|
|
#ifdef HAVE_PTRACE_GETFPXREGS
|
358 |
|
|
|
359 |
|
|
/* Fill GDB's register array with the floating-point and SSE register
|
360 |
|
|
values in *FPXREGSETP. */
|
361 |
|
|
|
362 |
|
|
void
|
363 |
|
|
supply_fpxregset (struct regcache *regcache,
|
364 |
|
|
const elf_fpxregset_t *fpxregsetp)
|
365 |
|
|
{
|
366 |
|
|
i387_supply_fxsave (regcache, -1, fpxregsetp);
|
367 |
|
|
}
|
368 |
|
|
|
369 |
|
|
/* Fill register REGNO (if it is a floating-point or SSE register) in
|
370 |
|
|
*FPXREGSETP with the value in GDB's register array. If REGNO is
|
371 |
|
|
-1, do this for all registers. */
|
372 |
|
|
|
373 |
|
|
void
|
374 |
|
|
fill_fpxregset (const struct regcache *regcache,
|
375 |
|
|
elf_fpxregset_t *fpxregsetp, int regno)
|
376 |
|
|
{
|
377 |
|
|
i387_collect_fxsave (regcache, regno, fpxregsetp);
|
378 |
|
|
}
|
379 |
|
|
|
380 |
|
|
/* Fetch all registers covered by the PTRACE_GETFPXREGS request from
|
381 |
|
|
process/thread TID and store their values in GDB's register array.
|
382 |
|
|
Return non-zero if successful, zero otherwise. */
|
383 |
|
|
|
384 |
|
|
static int
|
385 |
|
|
fetch_fpxregs (struct regcache *regcache, int tid)
|
386 |
|
|
{
|
387 |
|
|
elf_fpxregset_t fpxregs;
|
388 |
|
|
|
389 |
|
|
if (! have_ptrace_getfpxregs)
|
390 |
|
|
return 0;
|
391 |
|
|
|
392 |
|
|
if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0)
|
393 |
|
|
{
|
394 |
|
|
if (errno == EIO)
|
395 |
|
|
{
|
396 |
|
|
have_ptrace_getfpxregs = 0;
|
397 |
|
|
return 0;
|
398 |
|
|
}
|
399 |
|
|
|
400 |
|
|
perror_with_name (_("Couldn't read floating-point and SSE registers"));
|
401 |
|
|
}
|
402 |
|
|
|
403 |
|
|
supply_fpxregset (regcache, (const elf_fpxregset_t *) &fpxregs);
|
404 |
|
|
return 1;
|
405 |
|
|
}
|
406 |
|
|
|
407 |
|
|
/* Store all valid registers in GDB's register array covered by the
|
408 |
|
|
PTRACE_SETFPXREGS request into the process/thread specified by TID.
|
409 |
|
|
Return non-zero if successful, zero otherwise. */
|
410 |
|
|
|
411 |
|
|
static int
|
412 |
|
|
store_fpxregs (const struct regcache *regcache, int tid, int regno)
|
413 |
|
|
{
|
414 |
|
|
elf_fpxregset_t fpxregs;
|
415 |
|
|
|
416 |
|
|
if (! have_ptrace_getfpxregs)
|
417 |
|
|
return 0;
|
418 |
|
|
|
419 |
|
|
if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1)
|
420 |
|
|
{
|
421 |
|
|
if (errno == EIO)
|
422 |
|
|
{
|
423 |
|
|
have_ptrace_getfpxregs = 0;
|
424 |
|
|
return 0;
|
425 |
|
|
}
|
426 |
|
|
|
427 |
|
|
perror_with_name (_("Couldn't read floating-point and SSE registers"));
|
428 |
|
|
}
|
429 |
|
|
|
430 |
|
|
fill_fpxregset (regcache, &fpxregs, regno);
|
431 |
|
|
|
432 |
|
|
if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1)
|
433 |
|
|
perror_with_name (_("Couldn't write floating-point and SSE registers"));
|
434 |
|
|
|
435 |
|
|
return 1;
|
436 |
|
|
}
|
437 |
|
|
|
438 |
|
|
#else
|
439 |
|
|
|
440 |
|
|
static int fetch_fpxregs (struct regcache *regcache, int tid) { return 0; }
|
441 |
|
|
static int store_fpxregs (const struct regcache *regcache, int tid, int regno) { return 0; }
|
442 |
|
|
|
443 |
|
|
#endif /* HAVE_PTRACE_GETFPXREGS */
|
444 |
|
|
|
445 |
|
|
|
446 |
|
|
/* Transferring arbitrary registers between GDB and inferior. */
|
447 |
|
|
|
448 |
|
|
/* Fetch register REGNO from the child process. If REGNO is -1, do
|
449 |
|
|
this for all registers (including the floating point and SSE
|
450 |
|
|
registers). */
|
451 |
|
|
|
452 |
|
|
static void
|
453 |
|
|
i386_linux_fetch_inferior_registers (struct regcache *regcache, int regno)
|
454 |
|
|
{
|
455 |
|
|
int tid;
|
456 |
|
|
|
457 |
|
|
/* Use the old method of peeking around in `struct user' if the
|
458 |
|
|
GETREGS request isn't available. */
|
459 |
|
|
if (!have_ptrace_getregs)
|
460 |
|
|
{
|
461 |
|
|
int i;
|
462 |
|
|
|
463 |
|
|
for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++)
|
464 |
|
|
if (regno == -1 || regno == i)
|
465 |
|
|
fetch_register (regcache, i);
|
466 |
|
|
|
467 |
|
|
return;
|
468 |
|
|
}
|
469 |
|
|
|
470 |
|
|
/* GNU/Linux LWP ID's are process ID's. */
|
471 |
|
|
tid = TIDGET (inferior_ptid);
|
472 |
|
|
if (tid == 0)
|
473 |
|
|
tid = PIDGET (inferior_ptid); /* Not a threaded program. */
|
474 |
|
|
|
475 |
|
|
/* Use the PTRACE_GETFPXREGS request whenever possible, since it
|
476 |
|
|
transfers more registers in one system call, and we'll cache the
|
477 |
|
|
results. But remember that fetch_fpxregs can fail, and return
|
478 |
|
|
zero. */
|
479 |
|
|
if (regno == -1)
|
480 |
|
|
{
|
481 |
|
|
fetch_regs (regcache, tid);
|
482 |
|
|
|
483 |
|
|
/* The call above might reset `have_ptrace_getregs'. */
|
484 |
|
|
if (!have_ptrace_getregs)
|
485 |
|
|
{
|
486 |
|
|
i386_linux_fetch_inferior_registers (regcache, regno);
|
487 |
|
|
return;
|
488 |
|
|
}
|
489 |
|
|
|
490 |
|
|
if (fetch_fpxregs (regcache, tid))
|
491 |
|
|
return;
|
492 |
|
|
fetch_fpregs (regcache, tid);
|
493 |
|
|
return;
|
494 |
|
|
}
|
495 |
|
|
|
496 |
|
|
if (GETREGS_SUPPLIES (regno))
|
497 |
|
|
{
|
498 |
|
|
fetch_regs (regcache, tid);
|
499 |
|
|
return;
|
500 |
|
|
}
|
501 |
|
|
|
502 |
|
|
if (GETFPXREGS_SUPPLIES (regno))
|
503 |
|
|
{
|
504 |
|
|
if (fetch_fpxregs (regcache, tid))
|
505 |
|
|
return;
|
506 |
|
|
|
507 |
|
|
/* Either our processor or our kernel doesn't support the SSE
|
508 |
|
|
registers, so read the FP registers in the traditional way,
|
509 |
|
|
and fill the SSE registers with dummy values. It would be
|
510 |
|
|
more graceful to handle differences in the register set using
|
511 |
|
|
gdbarch. Until then, this will at least make things work
|
512 |
|
|
plausibly. */
|
513 |
|
|
fetch_fpregs (regcache, tid);
|
514 |
|
|
return;
|
515 |
|
|
}
|
516 |
|
|
|
517 |
|
|
internal_error (__FILE__, __LINE__,
|
518 |
|
|
_("Got request for bad register number %d."), regno);
|
519 |
|
|
}
|
520 |
|
|
|
521 |
|
|
/* Store register REGNO back into the child process. If REGNO is -1,
|
522 |
|
|
do this for all registers (including the floating point and SSE
|
523 |
|
|
registers). */
|
524 |
|
|
static void
|
525 |
|
|
i386_linux_store_inferior_registers (struct regcache *regcache, int regno)
|
526 |
|
|
{
|
527 |
|
|
int tid;
|
528 |
|
|
|
529 |
|
|
/* Use the old method of poking around in `struct user' if the
|
530 |
|
|
SETREGS request isn't available. */
|
531 |
|
|
if (!have_ptrace_getregs)
|
532 |
|
|
{
|
533 |
|
|
int i;
|
534 |
|
|
|
535 |
|
|
for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++)
|
536 |
|
|
if (regno == -1 || regno == i)
|
537 |
|
|
store_register (regcache, i);
|
538 |
|
|
|
539 |
|
|
return;
|
540 |
|
|
}
|
541 |
|
|
|
542 |
|
|
/* GNU/Linux LWP ID's are process ID's. */
|
543 |
|
|
tid = TIDGET (inferior_ptid);
|
544 |
|
|
if (tid == 0)
|
545 |
|
|
tid = PIDGET (inferior_ptid); /* Not a threaded program. */
|
546 |
|
|
|
547 |
|
|
/* Use the PTRACE_SETFPXREGS requests whenever possible, since it
|
548 |
|
|
transfers more registers in one system call. But remember that
|
549 |
|
|
store_fpxregs can fail, and return zero. */
|
550 |
|
|
if (regno == -1)
|
551 |
|
|
{
|
552 |
|
|
store_regs (regcache, tid, regno);
|
553 |
|
|
if (store_fpxregs (regcache, tid, regno))
|
554 |
|
|
return;
|
555 |
|
|
store_fpregs (regcache, tid, regno);
|
556 |
|
|
return;
|
557 |
|
|
}
|
558 |
|
|
|
559 |
|
|
if (GETREGS_SUPPLIES (regno))
|
560 |
|
|
{
|
561 |
|
|
store_regs (regcache, tid, regno);
|
562 |
|
|
return;
|
563 |
|
|
}
|
564 |
|
|
|
565 |
|
|
if (GETFPXREGS_SUPPLIES (regno))
|
566 |
|
|
{
|
567 |
|
|
if (store_fpxregs (regcache, tid, regno))
|
568 |
|
|
return;
|
569 |
|
|
|
570 |
|
|
/* Either our processor or our kernel doesn't support the SSE
|
571 |
|
|
registers, so just write the FP registers in the traditional
|
572 |
|
|
way. */
|
573 |
|
|
store_fpregs (regcache, tid, regno);
|
574 |
|
|
return;
|
575 |
|
|
}
|
576 |
|
|
|
577 |
|
|
internal_error (__FILE__, __LINE__,
|
578 |
|
|
_("Got request to store bad register number %d."), regno);
|
579 |
|
|
}
|
580 |
|
|
|
581 |
|
|
|
582 |
|
|
/* Support for debug registers. */
|
583 |
|
|
|
584 |
|
|
static unsigned long i386_linux_dr[DR_CONTROL + 1];
|
585 |
|
|
|
586 |
|
|
static unsigned long
|
587 |
|
|
i386_linux_dr_get (ptid_t ptid, int regnum)
|
588 |
|
|
{
|
589 |
|
|
int tid;
|
590 |
|
|
unsigned long value;
|
591 |
|
|
|
592 |
|
|
tid = TIDGET (ptid);
|
593 |
|
|
if (tid == 0)
|
594 |
|
|
tid = PIDGET (ptid);
|
595 |
|
|
|
596 |
|
|
/* FIXME: kettenis/2001-03-27: Calling perror_with_name if the
|
597 |
|
|
ptrace call fails breaks debugging remote targets. The correct
|
598 |
|
|
way to fix this is to add the hardware breakpoint and watchpoint
|
599 |
|
|
stuff to the target vector. For now, just return zero if the
|
600 |
|
|
ptrace call fails. */
|
601 |
|
|
errno = 0;
|
602 |
|
|
value = ptrace (PTRACE_PEEKUSER, tid,
|
603 |
|
|
offsetof (struct user, u_debugreg[regnum]), 0);
|
604 |
|
|
if (errno != 0)
|
605 |
|
|
#if 0
|
606 |
|
|
perror_with_name (_("Couldn't read debug register"));
|
607 |
|
|
#else
|
608 |
|
|
return 0;
|
609 |
|
|
#endif
|
610 |
|
|
|
611 |
|
|
return value;
|
612 |
|
|
}
|
613 |
|
|
|
614 |
|
|
static void
|
615 |
|
|
i386_linux_dr_set (ptid_t ptid, int regnum, unsigned long value)
|
616 |
|
|
{
|
617 |
|
|
int tid;
|
618 |
|
|
|
619 |
|
|
tid = TIDGET (ptid);
|
620 |
|
|
if (tid == 0)
|
621 |
|
|
tid = PIDGET (ptid);
|
622 |
|
|
|
623 |
|
|
errno = 0;
|
624 |
|
|
ptrace (PTRACE_POKEUSER, tid,
|
625 |
|
|
offsetof (struct user, u_debugreg[regnum]), value);
|
626 |
|
|
if (errno != 0)
|
627 |
|
|
perror_with_name (_("Couldn't write debug register"));
|
628 |
|
|
}
|
629 |
|
|
|
630 |
|
|
void
|
631 |
|
|
i386_linux_dr_set_control (unsigned long control)
|
632 |
|
|
{
|
633 |
|
|
struct lwp_info *lp;
|
634 |
|
|
ptid_t ptid;
|
635 |
|
|
|
636 |
|
|
i386_linux_dr[DR_CONTROL] = control;
|
637 |
|
|
ALL_LWPS (lp, ptid)
|
638 |
|
|
i386_linux_dr_set (ptid, DR_CONTROL, control);
|
639 |
|
|
}
|
640 |
|
|
|
641 |
|
|
void
|
642 |
|
|
i386_linux_dr_set_addr (int regnum, CORE_ADDR addr)
|
643 |
|
|
{
|
644 |
|
|
struct lwp_info *lp;
|
645 |
|
|
ptid_t ptid;
|
646 |
|
|
|
647 |
|
|
gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
|
648 |
|
|
|
649 |
|
|
i386_linux_dr[DR_FIRSTADDR + regnum] = addr;
|
650 |
|
|
ALL_LWPS (lp, ptid)
|
651 |
|
|
i386_linux_dr_set (ptid, DR_FIRSTADDR + regnum, addr);
|
652 |
|
|
}
|
653 |
|
|
|
654 |
|
|
void
|
655 |
|
|
i386_linux_dr_reset_addr (int regnum)
|
656 |
|
|
{
|
657 |
|
|
i386_linux_dr_set_addr (regnum, 0);
|
658 |
|
|
}
|
659 |
|
|
|
660 |
|
|
unsigned long
|
661 |
|
|
i386_linux_dr_get_status (void)
|
662 |
|
|
{
|
663 |
|
|
return i386_linux_dr_get (inferior_ptid, DR_STATUS);
|
664 |
|
|
}
|
665 |
|
|
|
666 |
|
|
static void
|
667 |
|
|
i386_linux_new_thread (ptid_t ptid)
|
668 |
|
|
{
|
669 |
|
|
int i;
|
670 |
|
|
|
671 |
|
|
for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
|
672 |
|
|
i386_linux_dr_set (ptid, i, i386_linux_dr[i]);
|
673 |
|
|
|
674 |
|
|
i386_linux_dr_set (ptid, DR_CONTROL, i386_linux_dr[DR_CONTROL]);
|
675 |
|
|
}
|
676 |
|
|
|
677 |
|
|
|
678 |
|
|
/* Called by libthread_db. Returns a pointer to the thread local
|
679 |
|
|
storage (or its descriptor). */
|
680 |
|
|
|
681 |
|
|
ps_err_e
|
682 |
|
|
ps_get_thread_area (const struct ps_prochandle *ph,
|
683 |
|
|
lwpid_t lwpid, int idx, void **base)
|
684 |
|
|
{
|
685 |
|
|
/* NOTE: cagney/2003-08-26: The definition of this buffer is found
|
686 |
|
|
in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x
|
687 |
|
|
4 byte integers in size: `entry_number', `base_addr', `limit',
|
688 |
|
|
and a bunch of status bits.
|
689 |
|
|
|
690 |
|
|
The values returned by this ptrace call should be part of the
|
691 |
|
|
regcache buffer, and ps_get_thread_area should channel its
|
692 |
|
|
request through the regcache. That way remote targets could
|
693 |
|
|
provide the value using the remote protocol and not this direct
|
694 |
|
|
call.
|
695 |
|
|
|
696 |
|
|
Is this function needed? I'm guessing that the `base' is the
|
697 |
|
|
address of a a descriptor that libthread_db uses to find the
|
698 |
|
|
thread local address base that GDB needs. Perhaps that
|
699 |
|
|
descriptor is defined by the ABI. Anyway, given that
|
700 |
|
|
libthread_db calls this function without prompting (gdb
|
701 |
|
|
requesting tls base) I guess it needs info in there anyway. */
|
702 |
|
|
unsigned int desc[4];
|
703 |
|
|
gdb_assert (sizeof (int) == 4);
|
704 |
|
|
|
705 |
|
|
#ifndef PTRACE_GET_THREAD_AREA
|
706 |
|
|
#define PTRACE_GET_THREAD_AREA 25
|
707 |
|
|
#endif
|
708 |
|
|
|
709 |
|
|
if (ptrace (PTRACE_GET_THREAD_AREA, lwpid,
|
710 |
|
|
(void *) idx, (unsigned long) &desc) < 0)
|
711 |
|
|
return PS_ERR;
|
712 |
|
|
|
713 |
|
|
*(int *)base = desc[1];
|
714 |
|
|
return PS_OK;
|
715 |
|
|
}
|
716 |
|
|
|
717 |
|
|
|
718 |
|
|
/* The instruction for a GNU/Linux system call is:
|
719 |
|
|
int $0x80
|
720 |
|
|
or 0xcd 0x80. */
|
721 |
|
|
|
722 |
|
|
static const unsigned char linux_syscall[] = { 0xcd, 0x80 };
|
723 |
|
|
|
724 |
|
|
#define LINUX_SYSCALL_LEN (sizeof linux_syscall)
|
725 |
|
|
|
726 |
|
|
/* The system call number is stored in the %eax register. */
|
727 |
|
|
#define LINUX_SYSCALL_REGNUM I386_EAX_REGNUM
|
728 |
|
|
|
729 |
|
|
/* We are specifically interested in the sigreturn and rt_sigreturn
|
730 |
|
|
system calls. */
|
731 |
|
|
|
732 |
|
|
#ifndef SYS_sigreturn
|
733 |
|
|
#define SYS_sigreturn 0x77
|
734 |
|
|
#endif
|
735 |
|
|
#ifndef SYS_rt_sigreturn
|
736 |
|
|
#define SYS_rt_sigreturn 0xad
|
737 |
|
|
#endif
|
738 |
|
|
|
739 |
|
|
/* Offset to saved processor flags, from <asm/sigcontext.h>. */
|
740 |
|
|
#define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64)
|
741 |
|
|
|
742 |
|
|
/* Resume execution of the inferior process.
|
743 |
|
|
If STEP is nonzero, single-step it.
|
744 |
|
|
If SIGNAL is nonzero, give it that signal. */
|
745 |
|
|
|
746 |
|
|
static void
|
747 |
|
|
i386_linux_resume (ptid_t ptid, int step, enum target_signal signal)
|
748 |
|
|
{
|
749 |
|
|
int pid = PIDGET (ptid);
|
750 |
|
|
|
751 |
|
|
int request = PTRACE_CONT;
|
752 |
|
|
|
753 |
|
|
if (step)
|
754 |
|
|
{
|
755 |
|
|
struct regcache *regcache = get_thread_regcache (pid_to_ptid (pid));
|
756 |
|
|
ULONGEST pc;
|
757 |
|
|
gdb_byte buf[LINUX_SYSCALL_LEN];
|
758 |
|
|
|
759 |
|
|
request = PTRACE_SINGLESTEP;
|
760 |
|
|
|
761 |
|
|
regcache_cooked_read_unsigned
|
762 |
|
|
(regcache, gdbarch_pc_regnum (get_regcache_arch (regcache)), &pc);
|
763 |
|
|
|
764 |
|
|
/* Returning from a signal trampoline is done by calling a
|
765 |
|
|
special system call (sigreturn or rt_sigreturn, see
|
766 |
|
|
i386-linux-tdep.c for more information). This system call
|
767 |
|
|
restores the registers that were saved when the signal was
|
768 |
|
|
raised, including %eflags. That means that single-stepping
|
769 |
|
|
won't work. Instead, we'll have to modify the signal context
|
770 |
|
|
that's about to be restored, and set the trace flag there. */
|
771 |
|
|
|
772 |
|
|
/* First check if PC is at a system call. */
|
773 |
|
|
if (read_memory_nobpt (pc, buf, LINUX_SYSCALL_LEN) == 0
|
774 |
|
|
&& memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0)
|
775 |
|
|
{
|
776 |
|
|
ULONGEST syscall;
|
777 |
|
|
regcache_cooked_read_unsigned (regcache,
|
778 |
|
|
LINUX_SYSCALL_REGNUM, &syscall);
|
779 |
|
|
|
780 |
|
|
/* Then check the system call number. */
|
781 |
|
|
if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn)
|
782 |
|
|
{
|
783 |
|
|
ULONGEST sp, addr;
|
784 |
|
|
unsigned long int eflags;
|
785 |
|
|
|
786 |
|
|
regcache_cooked_read_unsigned (regcache, I386_ESP_REGNUM, &sp);
|
787 |
|
|
if (syscall == SYS_rt_sigreturn)
|
788 |
|
|
addr = read_memory_integer (sp + 8, 4) + 20;
|
789 |
|
|
else
|
790 |
|
|
addr = sp;
|
791 |
|
|
|
792 |
|
|
/* Set the trace flag in the context that's about to be
|
793 |
|
|
restored. */
|
794 |
|
|
addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET;
|
795 |
|
|
read_memory (addr, (gdb_byte *) &eflags, 4);
|
796 |
|
|
eflags |= 0x0100;
|
797 |
|
|
write_memory (addr, (gdb_byte *) &eflags, 4);
|
798 |
|
|
}
|
799 |
|
|
}
|
800 |
|
|
}
|
801 |
|
|
|
802 |
|
|
if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1)
|
803 |
|
|
perror_with_name (("ptrace"));
|
804 |
|
|
}
|
805 |
|
|
|
806 |
|
|
static void (*super_post_startup_inferior) (ptid_t ptid);
|
807 |
|
|
|
808 |
|
|
static void
|
809 |
|
|
i386_linux_child_post_startup_inferior (ptid_t ptid)
|
810 |
|
|
{
|
811 |
|
|
i386_cleanup_dregs ();
|
812 |
|
|
super_post_startup_inferior (ptid);
|
813 |
|
|
}
|
814 |
|
|
|
815 |
|
|
void
|
816 |
|
|
_initialize_i386_linux_nat (void)
|
817 |
|
|
{
|
818 |
|
|
struct target_ops *t;
|
819 |
|
|
|
820 |
|
|
/* Fill in the generic GNU/Linux methods. */
|
821 |
|
|
t = linux_target ();
|
822 |
|
|
|
823 |
|
|
/* Override the default ptrace resume method. */
|
824 |
|
|
t->to_resume = i386_linux_resume;
|
825 |
|
|
|
826 |
|
|
/* Override the GNU/Linux inferior startup hook. */
|
827 |
|
|
super_post_startup_inferior = t->to_post_startup_inferior;
|
828 |
|
|
t->to_post_startup_inferior = i386_linux_child_post_startup_inferior;
|
829 |
|
|
|
830 |
|
|
/* Add our register access methods. */
|
831 |
|
|
t->to_fetch_registers = i386_linux_fetch_inferior_registers;
|
832 |
|
|
t->to_store_registers = i386_linux_store_inferior_registers;
|
833 |
|
|
|
834 |
|
|
/* Register the target. */
|
835 |
|
|
linux_nat_add_target (t);
|
836 |
|
|
linux_nat_set_new_thread (t, i386_linux_new_thread);
|
837 |
|
|
}
|