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b7c4cbf8b4
* config/i386/x86-64linux.mh (NATDEPFILES): x86-64-nat.o removed. * x86-64-linux-nat.c (x86_64_register_u_addr): New function. * config/i386/nm-x86-64.h (ATTACH_LWP): Removed. * Makefile.in (x86-64-tdep.o, x86-64-linux-tdep.o, x86-64-linux-nat.o): Fix dependencies.
589 lines
16 KiB
C
589 lines
16 KiB
C
/* Native-dependent code for Linux/x86-64.
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Copyright 2001, 2002 Free Software Foundation, Inc.
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Contributed by Jiri Smid, SuSE Labs.
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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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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 "i387-nat.h"
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#include "gdb_assert.h"
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#include "x86-64-tdep.h"
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#include <sys/ptrace.h>
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#include <sys/debugreg.h>
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#include <sys/syscall.h>
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#include <sys/procfs.h>
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static unsigned long
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x86_64_linux_dr_get (int regnum)
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{
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int tid;
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unsigned long value;
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/* FIXME: kettenis/2001-01-29: It's not clear what we should do with
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multi-threaded processes here. For now, pretend there is just
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one thread. */
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tid = PIDGET (inferior_ptid);
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/* FIXME: kettenis/2001-03-27: Calling perror_with_name if the
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ptrace call fails breaks debugging remote targets. The correct
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way to fix this is to add the hardware breakpoint and watchpoint
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stuff to the target vectore. For now, just return zero if the
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ptrace call fails. */
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errno = 0;
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value = ptrace (PT_READ_U, tid,
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offsetof (struct user, u_debugreg[regnum]), 0);
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if (errno != 0)
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#if 0
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perror_with_name ("Couldn't read debug register");
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#else
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return 0;
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#endif
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return value;
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}
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static void
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x86_64_linux_dr_set (int regnum, unsigned long value)
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{
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int tid;
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/* FIXME: kettenis/2001-01-29: It's not clear what we should do with
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multi-threaded processes here. For now, pretend there is just
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one thread. */
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tid = PIDGET (inferior_ptid);
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errno = 0;
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ptrace (PT_WRITE_U, tid,
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offsetof (struct user, u_debugreg[regnum]), value);
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if (errno != 0)
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perror_with_name ("Couldn't write debug register");
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}
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void
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x86_64_linux_dr_set_control (unsigned long control)
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{
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x86_64_linux_dr_set (DR_CONTROL, control);
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}
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void
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x86_64_linux_dr_set_addr (int regnum, CORE_ADDR addr)
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{
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gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
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x86_64_linux_dr_set (DR_FIRSTADDR + regnum, addr);
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}
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void
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x86_64_linux_dr_reset_addr (int regnum)
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{
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gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
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x86_64_linux_dr_set (DR_FIRSTADDR + regnum, 0L);
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}
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unsigned long
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x86_64_linux_dr_get_status (void)
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{
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return x86_64_linux_dr_get (DR_STATUS);
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}
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/* The register sets used in Linux ELF core-dumps are identical to the
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register sets used by `ptrace'. */
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#define GETREGS_SUPPLIES(regno) \
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(0 <= (regno) && (regno) <= 17)
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#define GETFPREGS_SUPPLIES(regno) \
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(FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM)
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#define PTRACE_XFER_TYPE unsigned long
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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 (elf_gregset_t * gregsetp)
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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 < X86_64_NUM_GREGS; i++)
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supply_register (i, (char *) (regp + x86_64_regmap[i]));
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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 (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 < X86_64_NUM_GREGS; i++)
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if ((regno == -1 || regno == i))
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read_register_gen (i, regp + x86_64_regmap[i]);
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}
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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 (int tid)
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{
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elf_gregset_t regs;
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if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0)
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perror_with_name ("Couldn't get registers");
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supply_gregset (®s);
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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 (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, (long) ®s) < 0)
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perror_with_name ("Couldn't get registers");
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fill_gregset (®s, regno);
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if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0)
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perror_with_name ("Couldn't write registers");
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}
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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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void
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supply_fpregset (elf_fpregset_t * fpregsetp)
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{
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i387_supply_fxsave ((char *) fpregsetp);
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}
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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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void
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fill_fpregset (elf_fpregset_t * fpregsetp, int regno)
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{
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i387_fill_fxsave ((char *) fpregsetp, regno);
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}
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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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static void
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fetch_fpregs (int tid)
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{
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elf_fpregset_t fpregs;
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if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
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perror_with_name ("Couldn't get floating point status");
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supply_fpregset (&fpregs);
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}
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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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static void
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store_fpregs (int tid, int regno)
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{
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elf_fpregset_t fpregs;
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if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
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perror_with_name ("Couldn't get floating point status");
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fill_fpregset (&fpregs, regno);
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if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0)
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perror_with_name ("Couldn't write floating point status");
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}
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/* Transferring arbitrary registers between GDB and inferior. */
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/* Fetch register REGNO from the child process. If REGNO is -1, do
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this for all registers (including the floating point and SSE
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registers). */
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void
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fetch_inferior_registers (int regno)
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{
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int tid;
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/* Linux LWP ID's are process ID's. */
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if ((tid = TIDGET (inferior_ptid)) == 0)
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tid = PIDGET (inferior_ptid); /* Not a threaded program. */
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if (regno == -1)
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{
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fetch_regs (tid);
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fetch_fpregs (tid);
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return;
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}
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if (GETREGS_SUPPLIES (regno))
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{
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fetch_regs (tid);
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return;
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}
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if (GETFPREGS_SUPPLIES (regno))
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{
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fetch_fpregs (tid);
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return;
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}
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internal_error (__FILE__, __LINE__,
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"Got request for bad register number %d.", regno);
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}
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/* Store register REGNO back into the child process. If REGNO is -1,
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do this for all registers (including the floating point and SSE
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registers). */
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void
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store_inferior_registers (int regno)
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{
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int tid;
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/* Linux LWP ID's are process ID's. */
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if ((tid = TIDGET (inferior_ptid)) == 0)
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tid = PIDGET (inferior_ptid); /* Not a threaded program. */
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if (regno == -1)
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{
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store_regs (tid, regno);
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store_fpregs (tid, regno);
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return;
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}
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if (GETREGS_SUPPLIES (regno))
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{
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store_regs (tid, regno);
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return;
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}
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if (GETFPREGS_SUPPLIES (regno))
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{
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store_fpregs (tid, regno);
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return;
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}
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internal_error (__FILE__, __LINE__,
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"Got request to store bad register number %d.", regno);
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}
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static const unsigned char linux_syscall[] = { 0x0f, 0x05 };
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#define LINUX_SYSCALL_LEN (sizeof linux_syscall)
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/* The system call number is stored in the %rax register. */
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#define LINUX_SYSCALL_REGNUM 0 /* %rax */
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/* We are specifically interested in the sigreturn and rt_sigreturn
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system calls. */
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#ifndef SYS_sigreturn
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#define SYS_sigreturn __NR_sigreturn
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#endif
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#ifndef SYS_rt_sigreturn
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#define SYS_rt_sigreturn __NR_rt_sigreturn
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#endif
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/* Offset to saved processor flags, from <asm/sigcontext.h>. */
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#define LINUX_SIGCONTEXT_EFLAGS_OFFSET (152)
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/* Offset to saved processor registers from <asm/ucontext.h> */
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#define LINUX_UCONTEXT_SIGCONTEXT_OFFSET (36)
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/* Resume execution of the inferior process.
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If STEP is nonzero, single-step it.
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If SIGNAL is nonzero, give it that signal. */
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void
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child_resume (ptid_t ptid, int step, enum target_signal signal)
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{
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int pid = PIDGET (ptid);
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int request = PTRACE_CONT;
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if (pid == -1)
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/* Resume all threads. */
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/* I think this only gets used in the non-threaded case, where "resume
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all threads" and "resume inferior_ptid" are the same. */
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pid = PIDGET (inferior_ptid);
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if (step)
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{
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CORE_ADDR pc = read_pc_pid (pid_to_ptid (pid));
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unsigned char buf[LINUX_SYSCALL_LEN];
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request = PTRACE_SINGLESTEP;
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/* Returning from a signal trampoline is done by calling a
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special system call (sigreturn or rt_sigreturn, see
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i386-linux-tdep.c for more information). This system call
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restores the registers that were saved when the signal was
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raised, including %eflags. That means that single-stepping
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won't work. Instead, we'll have to modify the signal context
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that's about to be restored, and set the trace flag there. */
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/* First check if PC is at a system call. */
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if (read_memory_nobpt (pc, (char *) buf, LINUX_SYSCALL_LEN) == 0
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&& memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0)
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{
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int syscall =
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read_register_pid (LINUX_SYSCALL_REGNUM, pid_to_ptid (pid));
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/* Then check the system call number. */
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if (syscall == SYS_rt_sigreturn)
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{
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CORE_ADDR sp = read_register (SP_REGNUM);
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CORE_ADDR addr = sp;
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unsigned long int eflags;
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addr +=
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sizeof (struct siginfo) + LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
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/* Set the trace flag in the context that's about to be
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restored. */
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addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET;
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read_memory (addr, (char *) &eflags, 8);
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eflags |= 0x0100;
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write_memory (addr, (char *) &eflags, 8);
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}
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}
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}
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if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1)
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perror_with_name ("ptrace");
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}
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/* Copy LEN bytes to or from inferior's memory starting at MEMADDR
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to debugger memory starting at MYADDR. Copy to inferior if
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WRITE is nonzero. TARGET is ignored.
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Returns the length copied, which is either the LEN argument or zero.
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This xfer function does not do partial moves, since child_ops
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doesn't allow memory operations to cross below us in the target stack
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anyway. */
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int
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child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
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struct mem_attrib *attrib, struct target_ops *target)
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{
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register int i;
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/* Round starting address down to longword boundary. */
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register CORE_ADDR addr = memaddr & -sizeof (PTRACE_XFER_TYPE);
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/* Round ending address up; get number of longwords that makes. */
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register int count
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= (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
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/ sizeof (PTRACE_XFER_TYPE);
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/* Allocate buffer of that many longwords. */
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/* FIXME (alloca): This code, cloned from infptrace.c, is unsafe
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because it uses alloca to allocate a buffer of arbitrary size.
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For very large xfers, this could crash GDB's stack. */
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register PTRACE_XFER_TYPE *buffer
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= (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
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if (write)
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{
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/* Fill start and end extra bytes of buffer with existing memory data. */
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if (addr != memaddr || len < (int) sizeof (PTRACE_XFER_TYPE))
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{
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/* Need part of initial word -- fetch it. */
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ptrace (PT_READ_I, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) addr, buffer);
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}
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if (count > 1) /* FIXME, avoid if even boundary */
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{
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ptrace (PT_READ_I, PIDGET (inferior_ptid),
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((PTRACE_ARG3_TYPE)
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(addr + (count - 1) * sizeof (PTRACE_XFER_TYPE))),
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buffer + count - 1);
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}
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/* Copy data to be written over corresponding part of buffer */
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memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
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myaddr, len);
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/* Write the entire buffer. */
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for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
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{
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errno = 0;
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ptrace (PT_WRITE_D, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) addr, buffer[i]);
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if (errno)
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{
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/* Using the appropriate one (I or D) is necessary for
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Gould NP1, at least. */
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errno = 0;
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ptrace (PT_WRITE_I, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) addr, buffer[i]);
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}
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if (errno)
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return 0;
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}
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#ifdef CLEAR_INSN_CACHE
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CLEAR_INSN_CACHE ();
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#endif
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}
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else
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{
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/* Read all the longwords */
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for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
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{
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errno = 0;
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ptrace (PT_READ_I, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) addr, buffer + i);
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if (errno)
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return 0;
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}
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/* Copy appropriate bytes out of the buffer. */
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memcpy (myaddr,
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(char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
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len);
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}
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return len;
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}
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/* Interpreting register set info found in core files. */
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/* Provide registers to GDB from a core file.
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CORE_REG_SECT points to an array of bytes, which are the contents
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of a `note' from a core file which BFD thinks might contain
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register contents. CORE_REG_SIZE is its size.
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WHICH says which register set corelow suspects this is:
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0 --- the general-purpose register set, in elf_gregset_t format
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2 --- the floating-point register set, in elf_fpregset_t format
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REG_ADDR isn't used on Linux. */
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static void
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fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
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int which, CORE_ADDR reg_addr)
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{
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elf_gregset_t gregset;
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elf_fpregset_t fpregset;
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switch (which)
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{
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case 0:
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if (core_reg_size != sizeof (gregset))
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warning ("Wrong size gregset in core file.");
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else
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{
|
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memcpy (&gregset, core_reg_sect, sizeof (gregset));
|
||
supply_gregset (&gregset);
|
||
}
|
||
break;
|
||
|
||
case 2:
|
||
if (core_reg_size != sizeof (fpregset))
|
||
warning ("Wrong size fpregset in core file.");
|
||
else
|
||
{
|
||
memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
|
||
supply_fpregset (&fpregset);
|
||
}
|
||
break;
|
||
|
||
default:
|
||
/* We've covered all the kinds of registers we know about here,
|
||
so this must be something we wouldn't know what to do with
|
||
anyway. Just ignore it. */
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Register that we are able to handle Linux ELF core file formats. */
|
||
|
||
static struct core_fns linux_elf_core_fns = {
|
||
bfd_target_elf_flavour, /* core_flavour */
|
||
default_check_format, /* check_format */
|
||
default_core_sniffer, /* core_sniffer */
|
||
fetch_core_registers, /* core_read_registers */
|
||
NULL /* next */
|
||
};
|
||
|
||
|
||
#if !defined (offsetof)
|
||
#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
|
||
#endif
|
||
|
||
/* Record the value of the debug control register. */
|
||
static long debug_control_mirror;
|
||
|
||
/* Record which address associates with which register. */
|
||
static CORE_ADDR address_lookup[DR_LASTADDR - DR_FIRSTADDR + 1];
|
||
|
||
/* Return the address of register REGNUM. BLOCKEND is the value of
|
||
u.u_ar0, which should point to the registers. */
|
||
CORE_ADDR
|
||
x86_64_register_u_addr (CORE_ADDR blockend, int regnum)
|
||
{
|
||
struct user u;
|
||
CORE_ADDR fpstate;
|
||
CORE_ADDR ubase;
|
||
ubase = blockend;
|
||
if (IS_FP_REGNUM(regnum))
|
||
{
|
||
fpstate = ubase + ((char *) &u.i387.st_space - (char *) &u);
|
||
return (fpstate + 16 * (regnum - FP0_REGNUM));
|
||
}
|
||
else if (IS_SSE_REGNUM(regnum))
|
||
{
|
||
fpstate = ubase + ((char *) &u.i387.xmm_space - (char *) &u);
|
||
return (fpstate + 16 * (regnum - XMM0_REGNUM));
|
||
}
|
||
else
|
||
return (ubase + 8 * x86_64_regmap[regnum]);
|
||
}
|
||
|
||
void
|
||
_initialize_x86_64_linux_nat (void)
|
||
{
|
||
add_core_fns (&linux_elf_core_fns);
|
||
}
|