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422 lines
10 KiB
C
422 lines
10 KiB
C
/* Native-dependent code for modern i386 BSD's.
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Copyright 2000, 2001, 2002 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 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 "regcache.h"
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#include "gdb_assert.h"
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#include <signal.h>
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#include <stddef.h>
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <machine/reg.h>
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#include <machine/frame.h>
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#ifdef HAVE_SYS_PROCFS_H
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#include <sys/procfs.h>
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#endif
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#ifndef HAVE_GREGSET_T
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typedef struct reg gregset_t;
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#endif
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#ifndef HAVE_FPREGSET_T
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typedef struct fpreg fpregset_t;
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#endif
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#include "gregset.h"
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#include "i386-tdep.h"
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/* In older BSD versions we cannot get at some of the segment
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registers. FreeBSD for example didn't support the %fs and %gs
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registers until the 3.0 release. We have autoconf checks for their
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presence, and deal gracefully with their absence. */
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/* Registers we shouldn't try to fetch. */
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#if !defined (CANNOT_FETCH_REGISTER)
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#define CANNOT_FETCH_REGISTER(regno) cannot_fetch_register (regno)
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#endif
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/* Registers we shouldn't try to store. */
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#if !defined (CANNOT_STORE_REGISTER)
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#define CANNOT_STORE_REGISTER(regno) cannot_fetch_register (regno)
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#endif
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/* Offset to the gregset_t location where REG is stored. */
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#define REG_OFFSET(reg) offsetof (gregset_t, reg)
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/* At reg_offset[REGNO] you'll find the offset to the gregset_t
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location where the GDB register REGNO is stored. Unsupported
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registers are marked with `-1'. */
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static int reg_offset[] =
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{
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REG_OFFSET (r_eax),
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REG_OFFSET (r_ecx),
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REG_OFFSET (r_edx),
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REG_OFFSET (r_ebx),
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REG_OFFSET (r_esp),
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REG_OFFSET (r_ebp),
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REG_OFFSET (r_esi),
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REG_OFFSET (r_edi),
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REG_OFFSET (r_eip),
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REG_OFFSET (r_eflags),
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REG_OFFSET (r_cs),
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REG_OFFSET (r_ss),
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REG_OFFSET (r_ds),
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REG_OFFSET (r_es),
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#ifdef HAVE_STRUCT_REG_R_FS
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REG_OFFSET (r_fs),
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#else
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-1,
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#endif
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#ifdef HAVE_STRUCT_REG_R_GS
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REG_OFFSET (r_gs)
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#else
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-1
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#endif
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};
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#define REG_ADDR(regset, regno) ((char *) (regset) + reg_offset[regno])
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/* Macro to determine if a register is fetched with PT_GETREGS. */
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#define GETREGS_SUPPLIES(regno) \
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((0 <= (regno) && (regno) <= 15))
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#ifdef HAVE_PT_GETXMMREGS
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/* Set to 1 if the kernel supports PT_GETXMMREGS. Initialized to -1
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so that we try PT_GETXMMREGS the first time around. */
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static int have_ptrace_xmmregs = -1;
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#endif
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/* Return nonzero if we shouldn't try to fetch register REGNO. */
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static int
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cannot_fetch_register (int regno)
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{
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return (reg_offset[regno] == -1);
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}
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/* Transfering the registers between GDB, inferiors 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 (gregset_t *gregsetp)
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{
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int i;
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for (i = 0; i < I386_NUM_GREGS; i++)
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{
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if (CANNOT_FETCH_REGISTER (i))
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supply_register (i, NULL);
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else
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supply_register (i, REG_ADDR (gregsetp, i));
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}
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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 (gregset_t *gregsetp, int regno)
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{
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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) && ! CANNOT_STORE_REGISTER (i))
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regcache_collect (i, REG_ADDR (gregsetp, i));
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}
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#include "i387-tdep.h"
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/* Fill GDB's register array with the floating-point register values
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in *FPREGSETP. */
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void
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supply_fpregset (fpregset_t *fpregsetp)
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{
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i387_supply_fsave ((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 (fpregset_t *fpregsetp, int regno)
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{
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i387_fill_fsave ((char *) fpregsetp, regno);
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}
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/* Fetch register REGNO from the inferior. If REGNO is -1, do this
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for all registers (including the floating point registers). */
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void
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fetch_inferior_registers (int regno)
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{
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if (regno == -1 || GETREGS_SUPPLIES (regno))
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{
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gregset_t gregs;
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if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
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perror_with_name ("Couldn't get registers");
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supply_gregset (&gregs);
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if (regno != -1)
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return;
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}
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if (regno == -1 || regno >= FP0_REGNUM)
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{
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fpregset_t fpregs;
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#ifdef HAVE_PT_GETXMMREGS
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char xmmregs[512];
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if (have_ptrace_xmmregs != 0 &&
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ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) xmmregs, 0) == 0)
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{
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have_ptrace_xmmregs = 1;
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i387_supply_fxsave (xmmregs);
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}
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else
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{
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if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
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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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#else
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if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
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perror_with_name ("Couldn't get floating point status");
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supply_fpregset (&fpregs);
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#endif
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}
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}
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/* Store register REGNO back into the inferior. If REGNO is -1, do
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this for all registers (including the floating point registers). */
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void
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store_inferior_registers (int regno)
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{
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if (regno == -1 || GETREGS_SUPPLIES (regno))
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{
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gregset_t gregs;
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if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
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perror_with_name ("Couldn't get registers");
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fill_gregset (&gregs, regno);
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if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
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perror_with_name ("Couldn't write registers");
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if (regno != -1)
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return;
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}
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if (regno == -1 || regno >= FP0_REGNUM)
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{
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fpregset_t fpregs;
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#ifdef HAVE_PT_GETXMMREGS
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char xmmregs[512];
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if (have_ptrace_xmmregs != 0 &&
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ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) xmmregs, 0) == 0)
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{
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have_ptrace_xmmregs = 1;
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i387_fill_fxsave (xmmregs, regno);
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if (ptrace (PT_SETXMMREGS, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) xmmregs, 0) == -1)
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perror_with_name ("Couldn't write XMM registers");
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}
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else
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{
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have_ptrace_xmmregs = 0;
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#endif
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if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
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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 (PT_SETFPREGS, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
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perror_with_name ("Couldn't write floating point status");
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#ifdef HAVE_PT_GETXMMREGS
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}
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#endif
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}
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}
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/* Support for debug registers. */
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#ifdef HAVE_PT_GETDBREGS
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/* Not all versions of FreeBSD/i386 that support the debug registers
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have this macro. */
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#ifndef DBREG_DRX
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#define DBREG_DRX(d, x) ((&d->dr0)[x])
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#endif
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static void
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i386bsd_dr_set (int regnum, unsigned int value)
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{
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struct dbreg dbregs;
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if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
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perror_with_name ("Couldn't get debug registers");
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/* For some mysterious reason, some of the reserved bits in the
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debug control register get set. Mask these off, otherwise the
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ptrace call below will fail. */
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dbregs.dr7 &= ~(0x0000fc00);
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DBREG_DRX ((&dbregs), regnum) = value;
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if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
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perror_with_name ("Couldn't write debug registers");
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}
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void
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i386bsd_dr_set_control (unsigned long control)
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{
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i386bsd_dr_set (7, control);
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}
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void
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i386bsd_dr_set_addr (int regnum, CORE_ADDR addr)
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{
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gdb_assert (regnum >= 0 && regnum <= 4);
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i386bsd_dr_set (regnum, addr);
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}
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void
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i386bsd_dr_reset_addr (int regnum)
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{
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gdb_assert (regnum >= 0 && regnum <= 4);
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i386bsd_dr_set (regnum, 0);
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}
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unsigned long
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i386bsd_dr_get_status (void)
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{
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struct dbreg dbregs;
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/* FIXME: kettenis/2001-03-31: 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 vector. For now, just return zero if the
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ptrace call fails. */
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if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) & dbregs, 0) == -1)
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#if 0
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perror_with_name ("Couldn't read debug registers");
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#else
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return 0;
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#endif
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return dbregs.dr6;
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}
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#endif /* PT_GETDBREGS */
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/* Support for the user struct. */
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/* Return the address register REGNO. 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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register_u_addr (CORE_ADDR blockend, int regno)
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{
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return (CORE_ADDR) REG_ADDR (blockend, regno);
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}
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#include <sys/param.h>
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#include <sys/user.h>
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/* Return the size of the user struct. */
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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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void
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_initialize_i386bsd_nat (void)
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{
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int sc_pc_offset;
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/* To support the recognition of signal handlers, i386bsd-tdep.c
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hardcodes some constants. Inclusion of this file means that we
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are compiling a native debugger, which means that we can use the
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system header files and sysctl(3) to get at the relevant
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information. */
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#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
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extern int i386fbsd4_sc_pc_offset;
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#define SC_PC_OFFSET i386fbsd4_sc_pc_offset
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#elif defined (NetBSD) || defined (__NetBSD_Version__)
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extern int i386nbsd_sc_pc_offset;
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#define SC_PC_OFFSET i386nbsd_sc_pc_offset
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#else
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extern int i386bsd_sc_pc_offset;
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#define SC_PC_OFFSET i386bsd_sc_pc_offset
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#endif
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/* Override the default value for the offset of the program counter
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in the sigcontext structure. */
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sc_pc_offset = offsetof (struct sigcontext, sc_pc);
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if (SC_PC_OFFSET != sc_pc_offset)
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{
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warning ("\
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offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\
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Please report this to <bug-gdb@gnu.org>.",
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sc_pc_offset, SC_PC_OFFSET);
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}
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SC_PC_OFFSET = sc_pc_offset;
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}
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