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

/* Native-dependent code for modern i386 BSD's.
   Copyright 2000, 2001, 2002, 2003 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.  */
#if !defined (CANNOT_FETCH_REGISTER)
#define CANNOT_FETCH_REGISTER(regno) cannot_fetch_register (regno)
#endif

/* Registers we shouldn't try to store.  */
#if !defined (CANNOT_STORE_REGISTER)
#define CANNOT_STORE_REGISTER(regno) cannot_fetch_register (regno)
#endif

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

/* At reg_offset[REGNO] you'll find the offset to the gregset_t
   location where the GDB register REGNO 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, regno) ((char *) (regset) + reg_offset[regno])

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

static int
cannot_fetch_register (int regno)
{
  return (reg_offset[regno] == -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 REGNO (if it is a general-purpose register) in
   *GREGSETPS with the value in GDB's register array.  If REGNO is -1,
   do this for all registers.  */

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

  for (i = 0; i < I386_NUM_GREGS; i++)
    if ((regno == -1 || regno == 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 REGNO (if it is a floating-point register) in
   *FPREGSETP with the value in GDB's register array.  If REGNO is -1,
   do this for all registers.  */

void
fill_fpregset (fpregset_t *fpregsetp, int regno)
{
  i387_fill_fsave ((char *) fpregsetp, regno);
}

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

void
fetch_inferior_registers (int regno)
{
  if (regno == -1 || GETREGS_SUPPLIES (regno))
    {
      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 (regno != -1)
	return;
    }

  if (regno == -1 || regno >= FP0_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 REGNO back into the inferior.  If REGNO is -1, do
   this for all registers (including the floating point registers).  */

void
store_inferior_registers (int regno)
{
  if (regno == -1 || GETREGS_SUPPLIES (regno))
    {
      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, regno);

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

      if (regno != -1)
	return;
    }

  if (regno == -1 || regno >= FP0_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_fill_fxsave (xmmregs, regno);

	  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_fill_fsave ((char *) &fpregs, regno);
  
          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 REGNO.  BLOCKEND is the value of
   u.u_ar0, which should point to the registers.  */

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

#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.
e2dbbd2d	2	Copyright 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
e6031aeb MK	3
	4	This file is part of GDB.
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	(at your option) any later version.
	10
	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 59 Temple Place - Suite 330,
	19	Boston, MA 02111-1307, USA. */
	20
	21	#include "defs.h"
	22	#include "inferior.h"
4e052eda	23	#include "regcache.h"
e6031aeb	24
0afdd437	25	#include "gdb_assert.h"
b7247919 MK	26	#include <signal.h>
b7247919 MK	27	#include <stddef.h>
e6031aeb MK	28	#include <sys/types.h>
	29	#include <sys/ptrace.h>
	30	#include <machine/reg.h>
	31	#include <machine/frame.h>
	32
	33	#ifdef HAVE_SYS_PROCFS_H
	34	#include <sys/procfs.h>
	35	#endif
	36
	37	#ifndef HAVE_GREGSET_T
	38	typedef struct reg gregset_t;
	39	#endif
	40
	41	#ifndef HAVE_FPREGSET_T
	42	typedef struct fpreg fpregset_t;
	43	#endif
	44
b051bfa4	45	#include "gregset.h"
57976e88	46	#include "i386-tdep.h"
b051bfa4 MK	47	\f
b051bfa4 MK	48
e6031aeb MK	49	/* In older BSD versions we cannot get at some of the segment
	50	registers. FreeBSD for example didn't support the %fs and %gs
	51	registers until the 3.0 release. We have autoconf checks for their
	52	presence, and deal gracefully with their absence. */
	53
	54	/* Registers we shouldn't try to fetch. */
	55	#if !defined (CANNOT_FETCH_REGISTER)
	56	#define CANNOT_FETCH_REGISTER(regno) cannot_fetch_register (regno)
	57	#endif
	58
	59	/* Registers we shouldn't try to store. */
	60	#if !defined (CANNOT_STORE_REGISTER)
b051bfa4	61	#define CANNOT_STORE_REGISTER(regno) cannot_fetch_register (regno)
e6031aeb MK	62	#endif
	63
	64	/* Offset to the gregset_t location where REG is stored. */
	65	#define REG_OFFSET(reg) offsetof (gregset_t, reg)
	66
	67	/* At reg_offset[REGNO] you'll find the offset to the gregset_t
	68	location where the GDB register REGNO is stored. Unsupported
	69	registers are marked with `-1'. */
	70	static int reg_offset[] =
	71	{
	72	REG_OFFSET (r_eax),
	73	REG_OFFSET (r_ecx),
	74	REG_OFFSET (r_edx),
2c48bda3	75	REG_OFFSET (r_ebx),
e6031aeb MK	76	REG_OFFSET (r_esp),
	77	REG_OFFSET (r_ebp),
	78	REG_OFFSET (r_esi),
	79	REG_OFFSET (r_edi),
	80	REG_OFFSET (r_eip),
	81	REG_OFFSET (r_eflags),
	82	REG_OFFSET (r_cs),
	83	REG_OFFSET (r_ss),
	84	REG_OFFSET (r_ds),
	85	REG_OFFSET (r_es),
422ea4b8	86	#ifdef HAVE_STRUCT_REG_R_FS
e6031aeb MK	87	REG_OFFSET (r_fs),
	88	#else
	89	-1,
	90	#endif
422ea4b8	91	#ifdef HAVE_STRUCT_REG_R_GS
e6031aeb MK	92	REG_OFFSET (r_gs)
	93	#else
	94	-1
	95	#endif
	96	};
	97
	98	#define REG_ADDR(regset, regno) ((char *) (regset) + reg_offset[regno])
	99
7e89e357 JT	100	/* Macro to determine if a register is fetched with PT_GETREGS. */
	101	#define GETREGS_SUPPLIES(regno) \
	102	((0 <= (regno) && (regno) <= 15))
	103
	104	#ifdef HAVE_PT_GETXMMREGS
	105	/* Set to 1 if the kernel supports PT_GETXMMREGS. Initialized to -1
	106	so that we try PT_GETXMMREGS the first time around. */
	107	static int have_ptrace_xmmregs = -1;
	108	#endif
	109
e6031aeb MK	110	/* Return nonzero if we shouldn't try to fetch register REGNO. */
	111
	112	static int
	113	cannot_fetch_register (int regno)
	114	{
	115	return (reg_offset[regno] == -1);
	116	}
	117	\f
	118
	119	/* Transfering the registers between GDB, inferiors and core files. */
	120
ad2a4d09	121	/* Fill GDB's register array with the general-purpose register values
e6031aeb MK	122	in GREGSETP. /
	123
	124	void
	125	supply_gregset (gregset_t *gregsetp)
	126	{
e6031aeb MK	127	int i;
e6031aeb MK	128
57976e88	129	for (i = 0; i < I386_NUM_GREGS; i++)
e6031aeb MK	130	{
e6031aeb MK	131	if (CANNOT_FETCH_REGISTER (i))
b051bfa4	132	supply_register (i, NULL);
e6031aeb MK	133	else
	134	supply_register (i, REG_ADDR (gregsetp, i));
	135	}
	136	}
	137
	138	/* Fill register REGNO (if it is a general-purpose register) in
	139	*GREGSETPS with the value in GDB's register array. If REGNO is -1,
	140	do this for all registers. */
	141
	142	void
	143	fill_gregset (gregset_t *gregsetp, int regno)
	144	{
	145	int i;
	146
57976e88	147	for (i = 0; i < I386_NUM_GREGS; i++)
e6031aeb	148	if ((regno == -1 \|\| regno == i) && ! CANNOT_STORE_REGISTER (i))
7e89e357	149	regcache_collect (i, REG_ADDR (gregsetp, i));
e6031aeb MK	150	}
e6031aeb MK	151
e750d25e	152	#include "i387-tdep.h"
e6031aeb MK	153
	154	/* Fill GDB's register array with the floating-point register values
	155	in FPREGSETP. /
	156
	157	void
	158	supply_fpregset (fpregset_t *fpregsetp)
	159	{
41d041d6	160	i387_supply_fsave (current_regcache, -1, fpregsetp);
e6031aeb MK	161	}
	162
	163	/* Fill register REGNO (if it is a floating-point register) in
	164	*FPREGSETP with the value in GDB's register array. If REGNO is -1,
	165	do this for all registers. */
	166
	167	void
	168	fill_fpregset (fpregset_t *fpregsetp, int regno)
	169	{
	170	i387_fill_fsave ((char *) fpregsetp, regno);
	171	}
	172
	173	/* Fetch register REGNO from the inferior. If REGNO is -1, do this
	174	for all registers (including the floating point registers). */
	175
	176	void
	177	fetch_inferior_registers (int regno)
	178	{
7e89e357 JT	179	if (regno == -1 \|\| GETREGS_SUPPLIES (regno))
	180	{
	181	gregset_t gregs;
	182
	183	if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
	184	(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
	185	perror_with_name ("Couldn't get registers");
e6031aeb	186
7e89e357 JT	187	supply_gregset (&gregs);
	188	if (regno != -1)
	189	return;
	190	}
e6031aeb MK	191
	192	if (regno == -1 \|\| regno >= FP0_REGNUM)
	193	{
	194	fpregset_t fpregs;
7e89e357 JT	195	#ifdef HAVE_PT_GETXMMREGS
	196	char xmmregs[512];
	197
a144416f MK	198	if (have_ptrace_xmmregs != 0
	199	&& ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
	200	(PTRACE_ARG3_TYPE) xmmregs, 0) == 0)
7e89e357 JT	201	{
7e89e357 JT	202	have_ptrace_xmmregs = 1;
41d041d6	203	i387_supply_fxsave (current_regcache, -1, xmmregs);
7e89e357 JT	204	}
	205	else
	206	{
	207	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
	208	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	209	perror_with_name ("Couldn't get floating point status");
e6031aeb	210
41d041d6	211	i387_supply_fsave (current_regcache, -1, &fpregs);
7e89e357 JT	212	}
7e89e357 JT	213	#else
39f77062	214	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
e6031aeb MK	215	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	216	perror_with_name ("Couldn't get floating point status");
	217
41d041d6	218	i387_supply_fsave (current_regcache, -1, &fpregs);
7e89e357	219	#endif
e6031aeb	220	}
b051bfa4	221	}
e6031aeb MK	222
	223	/* Store register REGNO back into the inferior. If REGNO is -1, do
	224	this for all registers (including the floating point registers). */
	225
	226	void
	227	store_inferior_registers (int regno)
	228	{
7e89e357 JT	229	if (regno == -1 \|\| GETREGS_SUPPLIES (regno))
	230	{
	231	gregset_t gregs;
	232
	233	if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
	234	(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
	235	perror_with_name ("Couldn't get registers");
e6031aeb	236
7e89e357	237	fill_gregset (&gregs, regno);
e6031aeb	238
7e89e357 JT	239	if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
	240	(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
	241	perror_with_name ("Couldn't write registers");
	242
	243	if (regno != -1)
	244	return;
	245	}
e6031aeb MK	246
	247	if (regno == -1 \|\| regno >= FP0_REGNUM)
	248	{
	249	fpregset_t fpregs;
7e89e357 JT	250	#ifdef HAVE_PT_GETXMMREGS
7e89e357 JT	251	char xmmregs[512];
e6031aeb	252
a144416f MK	253	if (have_ptrace_xmmregs != 0
	254	&& ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
	255	(PTRACE_ARG3_TYPE) xmmregs, 0) == 0)
7e89e357 JT	256	{
	257	have_ptrace_xmmregs = 1;
	258
	259	i387_fill_fxsave (xmmregs, regno);
e6031aeb	260
7e89e357 JT	261	if (ptrace (PT_SETXMMREGS, PIDGET (inferior_ptid),
	262	(PTRACE_ARG3_TYPE) xmmregs, 0) == -1)
	263	perror_with_name ("Couldn't write XMM registers");
	264	}
	265	else
	266	{
	267	have_ptrace_xmmregs = 0;
	268	#endif
	269	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
	270	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	271	perror_with_name ("Couldn't get floating point status");
	272
ed504bdf	273	i387_fill_fsave ((char *) &fpregs, regno);
e6031aeb	274
7e89e357 JT	275	if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
	276	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	277	perror_with_name ("Couldn't write floating point status");
	278	#ifdef HAVE_PT_GETXMMREGS
	279	}
	280	#endif
e6031aeb MK	281	}
	282	}
	283	\f
	284
0afdd437 MK	285	/* Support for debug registers. */
	286
	287	#ifdef HAVE_PT_GETDBREGS
	288
	289	/* Not all versions of FreeBSD/i386 that support the debug registers
	290	have this macro. */
	291	#ifndef DBREG_DRX
	292	#define DBREG_DRX(d, x) ((&d->dr0)[x])
	293	#endif
	294
	295	static void
	296	i386bsd_dr_set (int regnum, unsigned int value)
	297	{
	298	struct dbreg dbregs;
	299
39f77062 KB	300	if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
39f77062 KB	301	(PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
0afdd437 MK	302	perror_with_name ("Couldn't get debug registers");
	303
	304	/* For some mysterious reason, some of the reserved bits in the
	305	debug control register get set. Mask these off, otherwise the
	306	ptrace call below will fail. */
afdb036a	307	DBREG_DRX ((&dbregs), 7) &= ~(0x0000fc00);
0afdd437 MK	308
	309	DBREG_DRX ((&dbregs), regnum) = value;
	310
39f77062 KB	311	if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid),
39f77062 KB	312	(PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
0afdd437 MK	313	perror_with_name ("Couldn't write debug registers");
	314	}
	315
	316	void
	317	i386bsd_dr_set_control (unsigned long control)
	318	{
	319	i386bsd_dr_set (7, control);
	320	}
	321
	322	void
	323	i386bsd_dr_set_addr (int regnum, CORE_ADDR addr)
	324	{
	325	gdb_assert (regnum >= 0 && regnum <= 4);
	326
	327	i386bsd_dr_set (regnum, addr);
	328	}
	329
	330	void
	331	i386bsd_dr_reset_addr (int regnum)
	332	{
	333	gdb_assert (regnum >= 0 && regnum <= 4);
	334
	335	i386bsd_dr_set (regnum, 0);
	336	}
	337
	338	unsigned long
	339	i386bsd_dr_get_status (void)
	340	{
	341	struct dbreg dbregs;
	342
	343	/* FIXME: kettenis/2001-03-31: Calling perror_with_name if the
	344	ptrace call fails breaks debugging remote targets. The correct
	345	way to fix this is to add the hardware breakpoint and watchpoint
b7247919	346	stuff to the target vector. For now, just return zero if the
0afdd437	347	ptrace call fails. */
39f77062 KB	348	if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
39f77062 KB	349	(PTRACE_ARG3_TYPE) & dbregs, 0) == -1)
0afdd437 MK	350	#if 0
	351	perror_with_name ("Couldn't read debug registers");
	352	#else
	353	return 0;
	354	#endif
	355
afdb036a	356	return DBREG_DRX ((&dbregs), 6);
0afdd437 MK	357	}
	358
	359	#endif /* PT_GETDBREGS */
	360	\f
	361
e6031aeb MK	362	/* Support for the user struct. */
	363
	364	/* Return the address register REGNO. BLOCKEND is the value of
	365	u.u_ar0, which should point to the registers. */
	366
	367	CORE_ADDR
	368	register_u_addr (CORE_ADDR blockend, int regno)
	369	{
	370	return (CORE_ADDR) REG_ADDR (blockend, regno);
	371	}
	372
	373	#include <sys/param.h>
	374	#include <sys/user.h>
	375
	376	/* Return the size of the user struct. */
	377
	378	int
	379	kernel_u_size (void)
	380	{
	381	return (sizeof (struct user));
	382	}
b7247919	383	\f
b7247919 MK	384	void
	385	_initialize_i386bsd_nat (void)
	386	{
a3386186	387	int offset;
8201327c	388
b7247919 MK	389	/* To support the recognition of signal handlers, i386bsd-tdep.c
	390	hardcodes some constants. Inclusion of this file means that we
	391	are compiling a native debugger, which means that we can use the
	392	system header files and sysctl(3) to get at the relevant
	393	information. */
	394
8201327c	395	#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
a3386186 MK	396	#define SC_REG_OFFSET i386fbsd4_sc_reg_offset
a3386186 MK	397	#elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005
a3386186	398	#define SC_REG_OFFSET i386fbsd_sc_reg_offset
005328e3	399	#elif defined (NetBSD) \|\| defined (__NetBSD_Version__)
a3386186	400	#define SC_REG_OFFSET i386nbsd_sc_reg_offset
005328e3	401	#elif defined (OpenBSD)
a3386186	402	#define SC_REG_OFFSET i386obsd_sc_reg_offset
8201327c	403	#else
a144416f	404	#define SC_REG_OFFSET i386bsd_sc_reg_offset
8201327c MK	405	#endif
8201327c MK	406
a3386186 MK	407	/* We only check the program counter, stack pointer and frame
	408	pointer since these members of `struct sigcontext' are essential
	409	for providing backtraces. More checks could be added, but would
	410	involve adding configure checks for the appropriate structure
	411	members, since older BSD's don't provide all of them. */
	412
	413	#define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM]
	414	#define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM]
	415	#define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM]
	416
b7247919 MK	417	/* Override the default value for the offset of the program counter
b7247919 MK	418	in the sigcontext structure. */
a3386186	419	offset = offsetof (struct sigcontext, sc_pc);
8201327c	420
a3386186	421	if (SC_PC_OFFSET != offset)
8201327c MK	422	{
	423	warning ("\
	424	offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\
a3386186 MK	425	Please report this to <bug-gdb@gnu.org>.",
a3386186 MK	426	offset, SC_PC_OFFSET);
8201327c MK	427	}
8201327c MK	428
a3386186	429	SC_PC_OFFSET = offset;
6bff26de MK	430
6bff26de MK	431	/* Likewise for the stack pointer. */
a3386186	432	offset = offsetof (struct sigcontext, sc_sp);
6bff26de	433
a3386186	434	if (SC_SP_OFFSET != offset)
6bff26de MK	435	{
	436	warning ("\
	437	offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\
	438	Please report this to <bug-gdb@gnu.org>.",
a3386186 MK	439	offset, SC_SP_OFFSET);
	440	}
	441
	442	SC_SP_OFFSET = offset;
	443
	444	/* And the frame pointer. */
	445	offset = offsetof (struct sigcontext, sc_fp);
	446
	447	if (SC_FP_OFFSET != offset)
	448	{
	449	warning ("\
	450	offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\
	451	Please report this to <bug-gdb@gnu.org>.",
	452	offset, SC_FP_OFFSET);
6bff26de MK	453	}
6bff26de MK	454
a3386186	455	SC_FP_OFFSET = offset;
b7247919	456	}