[deliverable/binutils-gdb.git] / gdb / i386bsd-nat.c

/* Native-dependent code for modern i386 BSD's.

   Copyright 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "inferior.h"
#include "regcache.h"

#include "gdb_assert.h"
#include <signal.h>
#include <stddef.h>
#include <sys/types.h>
#include <sys/ptrace.h>
#include <machine/reg.h>
#include <machine/frame.h>

#ifdef HAVE_SYS_PROCFS_H
#include <sys/procfs.h>
#endif

#ifndef HAVE_GREGSET_T
typedef struct reg gregset_t;
#endif

#ifndef HAVE_FPREGSET_T
typedef struct fpreg fpregset_t;
#endif

#include "gregset.h"
#include "i386-tdep.h"
\f

/* In older BSD versions we cannot get at some of the segment
   registers.  FreeBSD for example didn't support the %fs and %gs
   registers until the 3.0 release.  We have autoconf checks for their
   presence, and deal gracefully with their absence.  */

/* Registers we shouldn't try to fetch.  */
#undef CANNOT_FETCH_REGISTER
#define CANNOT_FETCH_REGISTER(regnum) cannot_fetch_register (regnum)

/* Registers we shouldn't try to store.  */
#undef CANNOT_STORE_REGISTER
#define CANNOT_STORE_REGISTER(regnum) cannot_fetch_register (regnum)

/* Offset to the gregset_t location where REG is stored.  */
#define REG_OFFSET(reg) offsetof (gregset_t, reg)

/* At reg_offset[REGNUM] you'll find the offset to the gregset_t
   location where the GDB register REGNUM is stored.  Unsupported
   registers are marked with `-1'.  */
static int reg_offset[] =
{
  REG_OFFSET (r_eax),
  REG_OFFSET (r_ecx),
  REG_OFFSET (r_edx),
  REG_OFFSET (r_ebx),
  REG_OFFSET (r_esp),
  REG_OFFSET (r_ebp),
  REG_OFFSET (r_esi),
  REG_OFFSET (r_edi),
  REG_OFFSET (r_eip),
  REG_OFFSET (r_eflags),
  REG_OFFSET (r_cs),
  REG_OFFSET (r_ss),
  REG_OFFSET (r_ds),
  REG_OFFSET (r_es),
#ifdef HAVE_STRUCT_REG_R_FS
  REG_OFFSET (r_fs),
#else
  -1,
#endif
#ifdef HAVE_STRUCT_REG_R_GS
  REG_OFFSET (r_gs)
#else
  -1
#endif
};

#define REG_ADDR(regset, regnum) ((char *) (regset) + reg_offset[regnum])

/* Macro to determine if a register is fetched with PT_GETREGS.  */
#define GETREGS_SUPPLIES(regnum) \
  ((0 <= (regnum) && (regnum) <= 15))

#ifdef HAVE_PT_GETXMMREGS
/* Set to 1 if the kernel supports PT_GETXMMREGS.  Initialized to -1
   so that we try PT_GETXMMREGS the first time around.  */
static int have_ptrace_xmmregs = -1;
#endif

/* Return nonzero if we shouldn't try to fetch register REGNUM.  */

static int
cannot_fetch_register (int regnum)
{
  return (reg_offset[regnum] == -1);
}
\f

/* Transfering the registers between GDB, inferiors and core files.  */

/* Fill GDB's register array with the general-purpose register values
   in *GREGSETP.  */

void
supply_gregset (gregset_t *gregsetp)
{
  int i;

  for (i = 0; i < I386_NUM_GREGS; i++)
    {
      if (CANNOT_FETCH_REGISTER (i))
	supply_register (i, NULL);
      else
	supply_register (i, REG_ADDR (gregsetp, i));
    }
}

/* Fill register REGNUM (if it is a general-purpose register) in
   *GREGSETPS with the value in GDB's register array.  If REGNUM is -1,
   do this for all registers.  */

void
fill_gregset (gregset_t *gregsetp, int regnum)
{
  int i;

  for (i = 0; i < I386_NUM_GREGS; i++)
    if ((regnum == -1 || regnum == i) && ! CANNOT_STORE_REGISTER (i))
      regcache_collect (i, REG_ADDR (gregsetp, i));
}

#include "i387-tdep.h"

/* Fill GDB's register array with the floating-point register values
   in *FPREGSETP.  */

void
supply_fpregset (fpregset_t *fpregsetp)
{
  i387_supply_fsave (current_regcache, -1, fpregsetp);
}

/* Fill register REGNUM (if it is a floating-point register) in
   *FPREGSETP with the value in GDB's register array.  If REGNUM is
   -1, do this for all registers.  */

void
fill_fpregset (fpregset_t *fpregsetp, int regnum)
{
  i387_collect_fsave (current_regcache, regnum, fpregsetp);
}

/* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
   for all registers (including the floating point registers).  */

void
fetch_inferior_registers (int regnum)
{
  if (regnum == -1 || GETREGS_SUPPLIES (regnum))
    {
      gregset_t gregs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
		  (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
	perror_with_name ("Couldn't get registers");

      supply_gregset (&gregs);
      if (regnum != -1)
	return;
    }

  if (regnum == -1 || regnum >= I386_ST0_REGNUM)
    {
      fpregset_t fpregs;
#ifdef HAVE_PT_GETXMMREGS
      char xmmregs[512];

      if (have_ptrace_xmmregs != 0
	  && ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
		    (PTRACE_ARG3_TYPE) xmmregs, 0) == 0)
	{
	  have_ptrace_xmmregs = 1;
	  i387_supply_fxsave (current_regcache, -1, xmmregs);
	}
      else
	{
          if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
		      (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	    perror_with_name ("Couldn't get floating point status");

	  i387_supply_fsave (current_regcache, -1, &fpregs);
	}
#else
      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
		  (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	perror_with_name ("Couldn't get floating point status");

      i387_supply_fsave (current_regcache, -1, &fpregs);
#endif
    }
}

/* Store register REGNUM back into the inferior.  If REGNUM is -1, do
   this for all registers (including the floating point registers).  */

void
store_inferior_registers (int regnum)
{
  if (regnum == -1 || GETREGS_SUPPLIES (regnum))
    {
      gregset_t gregs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
                  (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
        perror_with_name ("Couldn't get registers");

      fill_gregset (&gregs, regnum);

      if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
	          (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
        perror_with_name ("Couldn't write registers");

      if (regnum != -1)
	return;
    }

  if (regnum == -1 || regnum >= I386_ST0_REGNUM)
    {
      fpregset_t fpregs;
#ifdef HAVE_PT_GETXMMREGS
      char xmmregs[512];

      if (have_ptrace_xmmregs != 0
	  && ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
		    (PTRACE_ARG3_TYPE) xmmregs, 0) == 0)
	{
	  have_ptrace_xmmregs = 1;

	  i387_collect_fxsave (current_regcache, regnum, xmmregs);

	  if (ptrace (PT_SETXMMREGS, PIDGET (inferior_ptid),
		      (PTRACE_ARG3_TYPE) xmmregs, 0) == -1)
            perror_with_name ("Couldn't write XMM registers");
	}
      else
	{
	  have_ptrace_xmmregs = 0;
#endif
          if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
		      (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	    perror_with_name ("Couldn't get floating point status");

          i387_collect_fsave (current_regcache, regnum, &fpregs);

          if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
		      (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	    perror_with_name ("Couldn't write floating point status");
#ifdef HAVE_PT_GETXMMREGS
        }
#endif
    }
}
\f

/* Support for debug registers.  */

#ifdef HAVE_PT_GETDBREGS

/* Not all versions of FreeBSD/i386 that support the debug registers
   have this macro.  */
#ifndef DBREG_DRX
#define DBREG_DRX(d, x) ((&d->dr0)[x])
#endif

static void
i386bsd_dr_set (int regnum, unsigned int value)
{
  struct dbreg dbregs;

  if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
              (PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
    perror_with_name ("Couldn't get debug registers");

  /* For some mysterious reason, some of the reserved bits in the
     debug control register get set.  Mask these off, otherwise the
     ptrace call below will fail.  */
  DBREG_DRX ((&dbregs), 7) &= ~(0x0000fc00);

  DBREG_DRX ((&dbregs), regnum) = value;

  if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid),
              (PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
    perror_with_name ("Couldn't write debug registers");
}

void
i386bsd_dr_set_control (unsigned long control)
{
  i386bsd_dr_set (7, control);
}

void
i386bsd_dr_set_addr (int regnum, CORE_ADDR addr)
{
  gdb_assert (regnum >= 0 && regnum <= 4);

  i386bsd_dr_set (regnum, addr);
}

void
i386bsd_dr_reset_addr (int regnum)
{
  gdb_assert (regnum >= 0 && regnum <= 4);

  i386bsd_dr_set (regnum, 0);
}

unsigned long
i386bsd_dr_get_status (void)
{
  struct dbreg dbregs;

  /* FIXME: kettenis/2001-03-31: Calling perror_with_name if the
     ptrace call fails breaks debugging remote targets.  The correct
     way to fix this is to add the hardware breakpoint and watchpoint
     stuff to the target vector.  For now, just return zero if the
     ptrace call fails.  */
  if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
	      (PTRACE_ARG3_TYPE) & dbregs, 0) == -1)
#if 0
    perror_with_name ("Couldn't read debug registers");
#else
    return 0;
#endif

  return DBREG_DRX ((&dbregs), 6);
}

#endif /* PT_GETDBREGS */
\f

/* Support for the user struct.  */

/* Return the address register REGNUM.  BLOCKEND is the value of
   u.u_ar0, which should point to the registers.  */

CORE_ADDR
register_u_addr (CORE_ADDR blockend, int regnum)
{
  return (CORE_ADDR) REG_ADDR (blockend, regnum);
}

#include <sys/param.h>
#include <sys/user.h>

/* Return the size of the user struct.  */

int
kernel_u_size (void)
{
  return (sizeof (struct user));
}
\f
void
_initialize_i386bsd_nat (void)
{
  int offset;

  /* To support the recognition of signal handlers, i386bsd-tdep.c
     hardcodes some constants.  Inclusion of this file means that we
     are compiling a native debugger, which means that we can use the
     system header files and sysctl(3) to get at the relevant
     information.  */

#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
#define SC_REG_OFFSET i386fbsd4_sc_reg_offset
#elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005
#define SC_REG_OFFSET i386fbsd_sc_reg_offset
#elif defined (NetBSD) || defined (__NetBSD_Version__)
#define SC_REG_OFFSET i386nbsd_sc_reg_offset
#elif defined (OpenBSD)
#define SC_REG_OFFSET i386obsd_sc_reg_offset
#else
#define SC_REG_OFFSET i386bsd_sc_reg_offset
#endif

  /* We only check the program counter, stack pointer and frame
     pointer since these members of `struct sigcontext' are essential
     for providing backtraces.  More checks could be added, but would
     involve adding configure checks for the appropriate structure
     members, since older BSD's don't provide all of them.  */

#define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM]
#define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM]
#define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM]

  /* Override the default value for the offset of the program counter
     in the sigcontext structure.  */
  offset = offsetof (struct sigcontext, sc_pc);

  if (SC_PC_OFFSET != offset)
    {
      warning ("\
offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\
Please report this to <bug-gdb@gnu.org>.", 
	       offset, SC_PC_OFFSET);
    }

  SC_PC_OFFSET = offset;

  /* Likewise for the stack pointer.  */
  offset = offsetof (struct sigcontext, sc_sp);

  if (SC_SP_OFFSET != offset)
    {
      warning ("\
offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\
Please report this to <bug-gdb@gnu.org>.",
	       offset, SC_SP_OFFSET);
    }

  SC_SP_OFFSET = offset;

  /* And the frame pointer.  */
  offset = offsetof (struct sigcontext, sc_fp);

  if (SC_FP_OFFSET != offset)
    {
      warning ("\
offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\
Please report this to <bug-gdb@gnu.org>.",
	       offset, SC_FP_OFFSET);
    }

  SC_FP_OFFSET = offset;
}
Commit	Line	Data
e6031aeb	1	/* Native-dependent code for modern i386 BSD's.
3f63813d MK	2
3f63813d MK	3	Copyright 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
e6031aeb MK	4
	5	This file is part of GDB.
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 2 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program; if not, write to the Free Software
	19	Foundation, Inc., 59 Temple Place - Suite 330,
	20	Boston, MA 02111-1307, USA. */
	21
	22	#include "defs.h"
	23	#include "inferior.h"
4e052eda	24	#include "regcache.h"
e6031aeb	25
0afdd437	26	#include "gdb_assert.h"
b7247919 MK	27	#include <signal.h>
b7247919 MK	28	#include <stddef.h>
e6031aeb MK	29	#include <sys/types.h>
	30	#include <sys/ptrace.h>
	31	#include <machine/reg.h>
	32	#include <machine/frame.h>
	33
	34	#ifdef HAVE_SYS_PROCFS_H
	35	#include <sys/procfs.h>
	36	#endif
	37
	38	#ifndef HAVE_GREGSET_T
	39	typedef struct reg gregset_t;
	40	#endif
	41
	42	#ifndef HAVE_FPREGSET_T
	43	typedef struct fpreg fpregset_t;
	44	#endif
	45
b051bfa4	46	#include "gregset.h"
57976e88	47	#include "i386-tdep.h"
b051bfa4 MK	48	\f
b051bfa4 MK	49
e6031aeb MK	50	/* In older BSD versions we cannot get at some of the segment
	51	registers. FreeBSD for example didn't support the %fs and %gs
	52	registers until the 3.0 release. We have autoconf checks for their
	53	presence, and deal gracefully with their absence. */
	54
	55	/* Registers we shouldn't try to fetch. */
3f63813d	56	#undef CANNOT_FETCH_REGISTER
283accbc	57	#define CANNOT_FETCH_REGISTER(regnum) cannot_fetch_register (regnum)
e6031aeb MK	58
e6031aeb MK	59	/* Registers we shouldn't try to store. */
3f63813d	60	#undef CANNOT_STORE_REGISTER
283accbc	61	#define CANNOT_STORE_REGISTER(regnum) cannot_fetch_register (regnum)
e6031aeb MK	62
	63	/* Offset to the gregset_t location where REG is stored. */
	64	#define REG_OFFSET(reg) offsetof (gregset_t, reg)
	65
283accbc MK	66	/* At reg_offset[REGNUM] you'll find the offset to the gregset_t
283accbc MK	67	location where the GDB register REGNUM is stored. Unsupported
e6031aeb MK	68	registers are marked with `-1'. */
	69	static int reg_offset[] =
	70	{
	71	REG_OFFSET (r_eax),
	72	REG_OFFSET (r_ecx),
	73	REG_OFFSET (r_edx),
2c48bda3	74	REG_OFFSET (r_ebx),
e6031aeb MK	75	REG_OFFSET (r_esp),
	76	REG_OFFSET (r_ebp),
	77	REG_OFFSET (r_esi),
	78	REG_OFFSET (r_edi),
	79	REG_OFFSET (r_eip),
	80	REG_OFFSET (r_eflags),
	81	REG_OFFSET (r_cs),
	82	REG_OFFSET (r_ss),
	83	REG_OFFSET (r_ds),
	84	REG_OFFSET (r_es),
422ea4b8	85	#ifdef HAVE_STRUCT_REG_R_FS
e6031aeb MK	86	REG_OFFSET (r_fs),
	87	#else
	88	-1,
	89	#endif
422ea4b8	90	#ifdef HAVE_STRUCT_REG_R_GS
e6031aeb MK	91	REG_OFFSET (r_gs)
	92	#else
	93	-1
	94	#endif
	95	};
	96
283accbc	97	#define REG_ADDR(regset, regnum) ((char *) (regset) + reg_offset[regnum])
e6031aeb	98
7e89e357	99	/* Macro to determine if a register is fetched with PT_GETREGS. */
283accbc MK	100	#define GETREGS_SUPPLIES(regnum) \
283accbc MK	101	((0 <= (regnum) && (regnum) <= 15))
7e89e357 JT	102
	103	#ifdef HAVE_PT_GETXMMREGS
	104	/* Set to 1 if the kernel supports PT_GETXMMREGS. Initialized to -1
	105	so that we try PT_GETXMMREGS the first time around. */
	106	static int have_ptrace_xmmregs = -1;
	107	#endif
	108
283accbc	109	/* Return nonzero if we shouldn't try to fetch register REGNUM. */
e6031aeb MK	110
e6031aeb MK	111	static int
283accbc	112	cannot_fetch_register (int regnum)
e6031aeb	113	{
283accbc	114	return (reg_offset[regnum] == -1);
e6031aeb MK	115	}
	116	\f
	117
	118	/* Transfering the registers between GDB, inferiors and core files. */
	119
ad2a4d09	120	/* Fill GDB's register array with the general-purpose register values
e6031aeb MK	121	in GREGSETP. /
	122
	123	void
	124	supply_gregset (gregset_t *gregsetp)
	125	{
e6031aeb MK	126	int i;
e6031aeb MK	127
57976e88	128	for (i = 0; i < I386_NUM_GREGS; i++)
e6031aeb MK	129	{
e6031aeb MK	130	if (CANNOT_FETCH_REGISTER (i))
b051bfa4	131	supply_register (i, NULL);
e6031aeb MK	132	else
	133	supply_register (i, REG_ADDR (gregsetp, i));
	134	}
	135	}
	136
283accbc MK	137	/* Fill register REGNUM (if it is a general-purpose register) in
283accbc MK	138	*GREGSETPS with the value in GDB's register array. If REGNUM is -1,
e6031aeb MK	139	do this for all registers. */
	140
	141	void
283accbc	142	fill_gregset (gregset_t *gregsetp, int regnum)
e6031aeb MK	143	{
	144	int i;
	145
57976e88	146	for (i = 0; i < I386_NUM_GREGS; i++)
283accbc	147	if ((regnum == -1 \|\| regnum == i) && ! CANNOT_STORE_REGISTER (i))
7e89e357	148	regcache_collect (i, REG_ADDR (gregsetp, i));
e6031aeb MK	149	}
e6031aeb MK	150
e750d25e	151	#include "i387-tdep.h"
e6031aeb MK	152
	153	/* Fill GDB's register array with the floating-point register values
	154	in FPREGSETP. /
	155
	156	void
	157	supply_fpregset (fpregset_t *fpregsetp)
	158	{
41d041d6	159	i387_supply_fsave (current_regcache, -1, fpregsetp);
e6031aeb MK	160	}
e6031aeb MK	161
283accbc MK	162	/* Fill register REGNUM (if it is a floating-point register) in
	163	*FPREGSETP with the value in GDB's register array. If REGNUM is
	164	-1, do this for all registers. */
e6031aeb MK	165
e6031aeb MK	166	void
283accbc	167	fill_fpregset (fpregset_t *fpregsetp, int regnum)
e6031aeb	168	{
283accbc	169	i387_collect_fsave (current_regcache, regnum, fpregsetp);
e6031aeb MK	170	}
e6031aeb MK	171
283accbc	172	/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
e6031aeb MK	173	for all registers (including the floating point registers). */
	174
	175	void
283accbc	176	fetch_inferior_registers (int regnum)
e6031aeb	177	{
283accbc	178	if (regnum == -1 \|\| GETREGS_SUPPLIES (regnum))
7e89e357 JT	179	{
	180	gregset_t gregs;
	181
	182	if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
	183	(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
	184	perror_with_name ("Couldn't get registers");
e6031aeb	185
7e89e357	186	supply_gregset (&gregs);
283accbc	187	if (regnum != -1)
7e89e357 JT	188	return;
7e89e357 JT	189	}
e6031aeb	190
283accbc	191	if (regnum == -1 \|\| regnum >= I386_ST0_REGNUM)
e6031aeb MK	192	{
e6031aeb MK	193	fpregset_t fpregs;
7e89e357 JT	194	#ifdef HAVE_PT_GETXMMREGS
	195	char xmmregs[512];
	196
a144416f MK	197	if (have_ptrace_xmmregs != 0
	198	&& ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
	199	(PTRACE_ARG3_TYPE) xmmregs, 0) == 0)
7e89e357 JT	200	{
7e89e357 JT	201	have_ptrace_xmmregs = 1;
41d041d6	202	i387_supply_fxsave (current_regcache, -1, xmmregs);
7e89e357 JT	203	}
	204	else
	205	{
	206	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
	207	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	208	perror_with_name ("Couldn't get floating point status");
e6031aeb	209
41d041d6	210	i387_supply_fsave (current_regcache, -1, &fpregs);
7e89e357 JT	211	}
7e89e357 JT	212	#else
39f77062	213	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
e6031aeb MK	214	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	215	perror_with_name ("Couldn't get floating point status");
	216
41d041d6	217	i387_supply_fsave (current_regcache, -1, &fpregs);
7e89e357	218	#endif
e6031aeb	219	}
b051bfa4	220	}
e6031aeb	221
283accbc	222	/* Store register REGNUM back into the inferior. If REGNUM is -1, do
e6031aeb MK	223	this for all registers (including the floating point registers). */
	224
	225	void
283accbc	226	store_inferior_registers (int regnum)
e6031aeb	227	{
283accbc	228	if (regnum == -1 \|\| GETREGS_SUPPLIES (regnum))
7e89e357 JT	229	{
	230	gregset_t gregs;
	231
	232	if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
	233	(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
	234	perror_with_name ("Couldn't get registers");
e6031aeb	235
283accbc	236	fill_gregset (&gregs, regnum);
e6031aeb	237
7e89e357 JT	238	if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
	239	(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
	240	perror_with_name ("Couldn't write registers");
	241
283accbc	242	if (regnum != -1)
7e89e357 JT	243	return;
7e89e357 JT	244	}
e6031aeb	245
283accbc	246	if (regnum == -1 \|\| regnum >= I386_ST0_REGNUM)
e6031aeb MK	247	{
e6031aeb MK	248	fpregset_t fpregs;
7e89e357 JT	249	#ifdef HAVE_PT_GETXMMREGS
7e89e357 JT	250	char xmmregs[512];
e6031aeb	251
a144416f MK	252	if (have_ptrace_xmmregs != 0
	253	&& ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
	254	(PTRACE_ARG3_TYPE) xmmregs, 0) == 0)
7e89e357 JT	255	{
	256	have_ptrace_xmmregs = 1;
	257
283accbc	258	i387_collect_fxsave (current_regcache, regnum, xmmregs);
e6031aeb	259
7e89e357 JT	260	if (ptrace (PT_SETXMMREGS, PIDGET (inferior_ptid),
	261	(PTRACE_ARG3_TYPE) xmmregs, 0) == -1)
	262	perror_with_name ("Couldn't write XMM registers");
	263	}
	264	else
	265	{
	266	have_ptrace_xmmregs = 0;
	267	#endif
	268	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
	269	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	270	perror_with_name ("Couldn't get floating point status");
	271
283accbc	272	i387_collect_fsave (current_regcache, regnum, &fpregs);
f5b1afdf	273
7e89e357 JT	274	if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
	275	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	276	perror_with_name ("Couldn't write floating point status");
	277	#ifdef HAVE_PT_GETXMMREGS
	278	}
	279	#endif
e6031aeb MK	280	}
	281	}
	282	\f
	283
0afdd437 MK	284	/* Support for debug registers. */
	285
	286	#ifdef HAVE_PT_GETDBREGS
	287
	288	/* Not all versions of FreeBSD/i386 that support the debug registers
	289	have this macro. */
	290	#ifndef DBREG_DRX
	291	#define DBREG_DRX(d, x) ((&d->dr0)[x])
	292	#endif
	293
	294	static void
	295	i386bsd_dr_set (int regnum, unsigned int value)
	296	{
	297	struct dbreg dbregs;
	298
39f77062 KB	299	if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
39f77062 KB	300	(PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
0afdd437 MK	301	perror_with_name ("Couldn't get debug registers");
	302
	303	/* For some mysterious reason, some of the reserved bits in the
	304	debug control register get set. Mask these off, otherwise the
	305	ptrace call below will fail. */
afdb036a	306	DBREG_DRX ((&dbregs), 7) &= ~(0x0000fc00);
0afdd437 MK	307
	308	DBREG_DRX ((&dbregs), regnum) = value;
	309
39f77062 KB	310	if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid),
39f77062 KB	311	(PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
0afdd437 MK	312	perror_with_name ("Couldn't write debug registers");
	313	}
	314
	315	void
	316	i386bsd_dr_set_control (unsigned long control)
	317	{
	318	i386bsd_dr_set (7, control);
	319	}
	320
	321	void
	322	i386bsd_dr_set_addr (int regnum, CORE_ADDR addr)
	323	{
	324	gdb_assert (regnum >= 0 && regnum <= 4);
	325
	326	i386bsd_dr_set (regnum, addr);
	327	}
	328
	329	void
	330	i386bsd_dr_reset_addr (int regnum)
	331	{
	332	gdb_assert (regnum >= 0 && regnum <= 4);
	333
	334	i386bsd_dr_set (regnum, 0);
	335	}
	336
	337	unsigned long
	338	i386bsd_dr_get_status (void)
	339	{
	340	struct dbreg dbregs;
	341
	342	/* FIXME: kettenis/2001-03-31: Calling perror_with_name if the
	343	ptrace call fails breaks debugging remote targets. The correct
	344	way to fix this is to add the hardware breakpoint and watchpoint
b7247919	345	stuff to the target vector. For now, just return zero if the
0afdd437	346	ptrace call fails. */
39f77062 KB	347	if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
39f77062 KB	348	(PTRACE_ARG3_TYPE) & dbregs, 0) == -1)
0afdd437 MK	349	#if 0
	350	perror_with_name ("Couldn't read debug registers");
	351	#else
	352	return 0;
	353	#endif
	354
afdb036a	355	return DBREG_DRX ((&dbregs), 6);
0afdd437 MK	356	}
	357
	358	#endif /* PT_GETDBREGS */
	359	\f
	360
e6031aeb MK	361	/* Support for the user struct. */
e6031aeb MK	362
283accbc	363	/* Return the address register REGNUM. BLOCKEND is the value of
e6031aeb MK	364	u.u_ar0, which should point to the registers. */
	365
	366	CORE_ADDR
283accbc	367	register_u_addr (CORE_ADDR blockend, int regnum)
e6031aeb	368	{
283accbc	369	return (CORE_ADDR) REG_ADDR (blockend, regnum);
e6031aeb MK	370	}
	371
	372	#include <sys/param.h>
	373	#include <sys/user.h>
	374
	375	/* Return the size of the user struct. */
	376
	377	int
	378	kernel_u_size (void)
	379	{
	380	return (sizeof (struct user));
	381	}
b7247919	382	\f
b7247919 MK	383	void
	384	_initialize_i386bsd_nat (void)
	385	{
a3386186	386	int offset;
8201327c	387
b7247919 MK	388	/* To support the recognition of signal handlers, i386bsd-tdep.c
	389	hardcodes some constants. Inclusion of this file means that we
	390	are compiling a native debugger, which means that we can use the
	391	system header files and sysctl(3) to get at the relevant
	392	information. */
	393
8201327c	394	#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
a3386186 MK	395	#define SC_REG_OFFSET i386fbsd4_sc_reg_offset
a3386186 MK	396	#elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005
a3386186	397	#define SC_REG_OFFSET i386fbsd_sc_reg_offset
005328e3	398	#elif defined (NetBSD) \|\| defined (__NetBSD_Version__)
a3386186	399	#define SC_REG_OFFSET i386nbsd_sc_reg_offset
005328e3	400	#elif defined (OpenBSD)
a3386186	401	#define SC_REG_OFFSET i386obsd_sc_reg_offset
8201327c	402	#else
a144416f	403	#define SC_REG_OFFSET i386bsd_sc_reg_offset
8201327c MK	404	#endif
8201327c MK	405
a3386186 MK	406	/* We only check the program counter, stack pointer and frame
	407	pointer since these members of `struct sigcontext' are essential
	408	for providing backtraces. More checks could be added, but would
	409	involve adding configure checks for the appropriate structure
	410	members, since older BSD's don't provide all of them. */
	411
	412	#define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM]
	413	#define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM]
	414	#define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM]
	415
b7247919 MK	416	/* Override the default value for the offset of the program counter
b7247919 MK	417	in the sigcontext structure. */
a3386186	418	offset = offsetof (struct sigcontext, sc_pc);
8201327c	419
a3386186	420	if (SC_PC_OFFSET != offset)
8201327c MK	421	{
	422	warning ("\
	423	offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\
a3386186 MK	424	Please report this to <bug-gdb@gnu.org>.",
a3386186 MK	425	offset, SC_PC_OFFSET);
8201327c MK	426	}
8201327c MK	427
a3386186	428	SC_PC_OFFSET = offset;
6bff26de MK	429
6bff26de MK	430	/* Likewise for the stack pointer. */
a3386186	431	offset = offsetof (struct sigcontext, sc_sp);
6bff26de	432
a3386186	433	if (SC_SP_OFFSET != offset)
6bff26de MK	434	{
	435	warning ("\
	436	offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\
	437	Please report this to <bug-gdb@gnu.org>.",
a3386186 MK	438	offset, SC_SP_OFFSET);
	439	}
	440
	441	SC_SP_OFFSET = offset;
	442
	443	/* And the frame pointer. */
	444	offset = offsetof (struct sigcontext, sc_fp);
	445
	446	if (SC_FP_OFFSET != offset)
	447	{
	448	warning ("\
	449	offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\
	450	Please report this to <bug-gdb@gnu.org>.",
	451	offset, SC_FP_OFFSET);
6bff26de MK	452	}
6bff26de MK	453
a3386186	454	SC_FP_OFFSET = offset;
b7247919	455	}