91fd20f71f
* x86-64-linux-nat.c (fill_gregset): Explicit cast to avoid warning. * x86-64-tdep.c (i386_gdbarch_init): Ditto. (x86_64_register_info_table): Added comments with register numbers.
448 lines
11 KiB
C
448 lines
11 KiB
C
/* Native-dependent code for GNU/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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#include <sys/reg.h>
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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 x86_64_regmap[] = {
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RAX, RBX, RCX, RDX,
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RSI, RDI, RBP, RSP,
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R8, R9, R10, R11,
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R12, R13, R14, R15,
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RIP, EFLAGS,
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DS, ES, FS, GS
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};
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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, 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 GNU/Linux ELF core-dumps are identical to
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the register sets used by `ptrace'. */
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#define GETREGS_SUPPLIES(regno) \
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(0 <= (regno) && (regno) < x86_64_num_gregs)
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#define GETFPREGS_SUPPLIES(regno) \
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(FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM)
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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, (char *) (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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/* GNU/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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/* GNU/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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/* 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 GNU/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));
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supply_gregset (&gregset);
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}
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break;
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case 2:
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if (core_reg_size != sizeof (fpregset))
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warning ("Wrong size fpregset in core file.");
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else
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{
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memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
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supply_fpregset (&fpregset);
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}
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break;
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default:
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/* We've covered all the kinds of registers we know about here,
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so this must be something we wouldn't know what to do with
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anyway. Just ignore it. */
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break;
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}
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}
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/* Register that we are able to handle GNU/Linux ELF core file formats. */
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static struct core_fns linux_elf_core_fns = {
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bfd_target_elf_flavour, /* core_flavour */
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default_check_format, /* check_format */
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default_core_sniffer, /* core_sniffer */
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fetch_core_registers, /* core_read_registers */
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NULL /* next */
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};
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#if !defined (offsetof)
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#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
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#endif
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/* Record the value of the debug control register. */
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static long debug_control_mirror;
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/* Record which address associates with which register. */
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static CORE_ADDR address_lookup[DR_LASTADDR - DR_FIRSTADDR + 1];
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/* Return the address of register REGNUM. BLOCKEND is the value of
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u.u_ar0, which should point to the registers. */
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CORE_ADDR
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x86_64_register_u_addr (CORE_ADDR blockend, int regnum)
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{
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struct user u;
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CORE_ADDR fpstate;
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CORE_ADDR ubase;
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ubase = blockend;
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if (IS_FP_REGNUM (regnum))
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{
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fpstate = ubase + ((char *) &u.i387.st_space - (char *) &u);
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return (fpstate + 16 * (regnum - FP0_REGNUM));
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}
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else if (IS_SSE_REGNUM (regnum))
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{
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fpstate = ubase + ((char *) &u.i387.xmm_space - (char *) &u);
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return (fpstate + 16 * (regnum - XMM0_REGNUM));
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}
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else
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return (ubase + 8 * x86_64_regmap[regnum]);
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}
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void
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_initialize_x86_64_linux_nat (void)
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{
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add_core_fns (&linux_elf_core_fns);
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}
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int
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kernel_u_size (void)
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{
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return (sizeof (struct user));
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}
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