[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)
{
  struct regcache *regcache = current_regcache;
  int regnum;

  for (regnum = 0; regnum < I386_NUM_GREGS; regnum++)
    {
      if (CANNOT_FETCH_REGISTER (regnum))
	regcache_raw_supply (regcache, regnum, NULL);
      else
	regcache_raw_supply (regcache, regnum, REG_ADDR (gregsetp, regnum));
    }
}

/* 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)
{
  struct regcache *regcache = current_regcache;
  int i;

  for (i = 0; i < I386_NUM_GREGS; i++)
    if ((regnum == -1 || regnum == i) && ! CANNOT_STORE_REGISTER (i))
      regcache_raw_collect (regcache, 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	{
feae6502 MK	126	struct regcache *regcache = current_regcache;
feae6502 MK	127	int regnum;
e6031aeb	128
feae6502	129	for (regnum = 0; regnum < I386_NUM_GREGS; regnum++)
e6031aeb	130	{
feae6502 MK	131	if (CANNOT_FETCH_REGISTER (regnum))
feae6502 MK	132	regcache_raw_supply (regcache, regnum, NULL);
e6031aeb	133	else
feae6502	134	regcache_raw_supply (regcache, regnum, REG_ADDR (gregsetp, regnum));
e6031aeb MK	135	}
	136	}
	137
283accbc MK	138	/* Fill register REGNUM (if it is a general-purpose register) in
283accbc MK	139	*GREGSETPS with the value in GDB's register array. If REGNUM is -1,
e6031aeb MK	140	do this for all registers. */
	141
	142	void
283accbc	143	fill_gregset (gregset_t *gregsetp, int regnum)
e6031aeb	144	{
feae6502	145	struct regcache *regcache = current_regcache;
e6031aeb MK	146	int i;
e6031aeb MK	147
57976e88	148	for (i = 0; i < I386_NUM_GREGS; i++)
283accbc	149	if ((regnum == -1 \|\| regnum == i) && ! CANNOT_STORE_REGISTER (i))
feae6502	150	regcache_raw_collect (regcache, i, REG_ADDR (gregsetp, i));
e6031aeb MK	151	}
e6031aeb MK	152
e750d25e	153	#include "i387-tdep.h"
e6031aeb MK	154
	155	/* Fill GDB's register array with the floating-point register values
	156	in FPREGSETP. /
	157
	158	void
	159	supply_fpregset (fpregset_t *fpregsetp)
	160	{
41d041d6	161	i387_supply_fsave (current_regcache, -1, fpregsetp);
e6031aeb MK	162	}
e6031aeb MK	163
283accbc MK	164	/* Fill register REGNUM (if it is a floating-point register) in
	165	*FPREGSETP with the value in GDB's register array. If REGNUM is
	166	-1, do this for all registers. */
e6031aeb MK	167
e6031aeb MK	168	void
283accbc	169	fill_fpregset (fpregset_t *fpregsetp, int regnum)
e6031aeb	170	{
283accbc	171	i387_collect_fsave (current_regcache, regnum, fpregsetp);
e6031aeb MK	172	}
e6031aeb MK	173
283accbc	174	/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
e6031aeb MK	175	for all registers (including the floating point registers). */
	176
	177	void
283accbc	178	fetch_inferior_registers (int regnum)
e6031aeb	179	{
283accbc	180	if (regnum == -1 \|\| GETREGS_SUPPLIES (regnum))
7e89e357 JT	181	{
	182	gregset_t gregs;
	183
	184	if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
	185	(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
	186	perror_with_name ("Couldn't get registers");
e6031aeb	187
7e89e357	188	supply_gregset (&gregs);
283accbc	189	if (regnum != -1)
7e89e357 JT	190	return;
7e89e357 JT	191	}
e6031aeb	192
283accbc	193	if (regnum == -1 \|\| regnum >= I386_ST0_REGNUM)
e6031aeb MK	194	{
e6031aeb MK	195	fpregset_t fpregs;
7e89e357 JT	196	#ifdef HAVE_PT_GETXMMREGS
	197	char xmmregs[512];
	198
a144416f MK	199	if (have_ptrace_xmmregs != 0
	200	&& ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
	201	(PTRACE_ARG3_TYPE) xmmregs, 0) == 0)
7e89e357 JT	202	{
7e89e357 JT	203	have_ptrace_xmmregs = 1;
41d041d6	204	i387_supply_fxsave (current_regcache, -1, xmmregs);
7e89e357 JT	205	}
	206	else
	207	{
	208	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
	209	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	210	perror_with_name ("Couldn't get floating point status");
e6031aeb	211
41d041d6	212	i387_supply_fsave (current_regcache, -1, &fpregs);
7e89e357 JT	213	}
7e89e357 JT	214	#else
39f77062	215	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
e6031aeb MK	216	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	217	perror_with_name ("Couldn't get floating point status");
	218
41d041d6	219	i387_supply_fsave (current_regcache, -1, &fpregs);
7e89e357	220	#endif
e6031aeb	221	}
b051bfa4	222	}
e6031aeb	223
283accbc	224	/* Store register REGNUM back into the inferior. If REGNUM is -1, do
e6031aeb MK	225	this for all registers (including the floating point registers). */
	226
	227	void
283accbc	228	store_inferior_registers (int regnum)
e6031aeb	229	{
283accbc	230	if (regnum == -1 \|\| GETREGS_SUPPLIES (regnum))
7e89e357 JT	231	{
	232	gregset_t gregs;
	233
	234	if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
	235	(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
	236	perror_with_name ("Couldn't get registers");
e6031aeb	237
283accbc	238	fill_gregset (&gregs, regnum);
e6031aeb	239
7e89e357 JT	240	if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
	241	(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
	242	perror_with_name ("Couldn't write registers");
	243
283accbc	244	if (regnum != -1)
7e89e357 JT	245	return;
7e89e357 JT	246	}
e6031aeb	247
283accbc	248	if (regnum == -1 \|\| regnum >= I386_ST0_REGNUM)
e6031aeb MK	249	{
e6031aeb MK	250	fpregset_t fpregs;
7e89e357 JT	251	#ifdef HAVE_PT_GETXMMREGS
7e89e357 JT	252	char xmmregs[512];
e6031aeb	253
a144416f MK	254	if (have_ptrace_xmmregs != 0
	255	&& ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
	256	(PTRACE_ARG3_TYPE) xmmregs, 0) == 0)
7e89e357 JT	257	{
	258	have_ptrace_xmmregs = 1;
	259
283accbc	260	i387_collect_fxsave (current_regcache, regnum, xmmregs);
e6031aeb	261
7e89e357 JT	262	if (ptrace (PT_SETXMMREGS, PIDGET (inferior_ptid),
	263	(PTRACE_ARG3_TYPE) xmmregs, 0) == -1)
	264	perror_with_name ("Couldn't write XMM registers");
	265	}
	266	else
	267	{
	268	have_ptrace_xmmregs = 0;
	269	#endif
	270	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
	271	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	272	perror_with_name ("Couldn't get floating point status");
	273
283accbc	274	i387_collect_fsave (current_regcache, regnum, &fpregs);
f5b1afdf	275
7e89e357 JT	276	if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
	277	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	278	perror_with_name ("Couldn't write floating point status");
	279	#ifdef HAVE_PT_GETXMMREGS
	280	}
	281	#endif
e6031aeb MK	282	}
	283	}
	284	\f
	285
0afdd437 MK	286	/* Support for debug registers. */
	287
	288	#ifdef HAVE_PT_GETDBREGS
	289
	290	/* Not all versions of FreeBSD/i386 that support the debug registers
	291	have this macro. */
	292	#ifndef DBREG_DRX
	293	#define DBREG_DRX(d, x) ((&d->dr0)[x])
	294	#endif
	295
	296	static void
	297	i386bsd_dr_set (int regnum, unsigned int value)
	298	{
	299	struct dbreg dbregs;
	300
39f77062 KB	301	if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
39f77062 KB	302	(PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
0afdd437 MK	303	perror_with_name ("Couldn't get debug registers");
	304
	305	/* For some mysterious reason, some of the reserved bits in the
	306	debug control register get set. Mask these off, otherwise the
	307	ptrace call below will fail. */
afdb036a	308	DBREG_DRX ((&dbregs), 7) &= ~(0x0000fc00);
0afdd437 MK	309
	310	DBREG_DRX ((&dbregs), regnum) = value;
	311
39f77062 KB	312	if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid),
39f77062 KB	313	(PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
0afdd437 MK	314	perror_with_name ("Couldn't write debug registers");
	315	}
	316
	317	void
	318	i386bsd_dr_set_control (unsigned long control)
	319	{
	320	i386bsd_dr_set (7, control);
	321	}
	322
	323	void
	324	i386bsd_dr_set_addr (int regnum, CORE_ADDR addr)
	325	{
	326	gdb_assert (regnum >= 0 && regnum <= 4);
	327
	328	i386bsd_dr_set (regnum, addr);
	329	}
	330
	331	void
	332	i386bsd_dr_reset_addr (int regnum)
	333	{
	334	gdb_assert (regnum >= 0 && regnum <= 4);
	335
	336	i386bsd_dr_set (regnum, 0);
	337	}
	338
	339	unsigned long
	340	i386bsd_dr_get_status (void)
	341	{
	342	struct dbreg dbregs;
	343
	344	/* FIXME: kettenis/2001-03-31: Calling perror_with_name if the
	345	ptrace call fails breaks debugging remote targets. The correct
	346	way to fix this is to add the hardware breakpoint and watchpoint
b7247919	347	stuff to the target vector. For now, just return zero if the
0afdd437	348	ptrace call fails. */
39f77062 KB	349	if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
39f77062 KB	350	(PTRACE_ARG3_TYPE) & dbregs, 0) == -1)
0afdd437 MK	351	#if 0
	352	perror_with_name ("Couldn't read debug registers");
	353	#else
	354	return 0;
	355	#endif
	356
afdb036a	357	return DBREG_DRX ((&dbregs), 6);
0afdd437 MK	358	}
	359
	360	#endif /* PT_GETDBREGS */
	361	\f
	362
e6031aeb MK	363	/* Support for the user struct. */
e6031aeb MK	364
283accbc	365	/* Return the address register REGNUM. BLOCKEND is the value of
e6031aeb MK	366	u.u_ar0, which should point to the registers. */
	367
	368	CORE_ADDR
283accbc	369	register_u_addr (CORE_ADDR blockend, int regnum)
e6031aeb	370	{
283accbc	371	return (CORE_ADDR) REG_ADDR (blockend, regnum);
e6031aeb MK	372	}
	373
	374	#include <sys/param.h>
	375	#include <sys/user.h>
	376
	377	/* Return the size of the user struct. */
	378
	379	int
	380	kernel_u_size (void)
	381	{
	382	return (sizeof (struct user));
	383	}
b7247919	384	\f
b7247919 MK	385	void
	386	_initialize_i386bsd_nat (void)
	387	{
a3386186	388	int offset;
8201327c	389
b7247919 MK	390	/* To support the recognition of signal handlers, i386bsd-tdep.c
	391	hardcodes some constants. Inclusion of this file means that we
	392	are compiling a native debugger, which means that we can use the
	393	system header files and sysctl(3) to get at the relevant
	394	information. */
	395
8201327c	396	#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
a3386186 MK	397	#define SC_REG_OFFSET i386fbsd4_sc_reg_offset
a3386186 MK	398	#elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005
a3386186	399	#define SC_REG_OFFSET i386fbsd_sc_reg_offset
005328e3	400	#elif defined (NetBSD) \|\| defined (__NetBSD_Version__)
a3386186	401	#define SC_REG_OFFSET i386nbsd_sc_reg_offset
005328e3	402	#elif defined (OpenBSD)
a3386186	403	#define SC_REG_OFFSET i386obsd_sc_reg_offset
8201327c	404	#else
a144416f	405	#define SC_REG_OFFSET i386bsd_sc_reg_offset
8201327c MK	406	#endif
8201327c MK	407
a3386186 MK	408	/* We only check the program counter, stack pointer and frame
	409	pointer since these members of `struct sigcontext' are essential
	410	for providing backtraces. More checks could be added, but would
	411	involve adding configure checks for the appropriate structure
	412	members, since older BSD's don't provide all of them. */
	413
	414	#define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM]
	415	#define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM]
	416	#define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM]
	417
b7247919 MK	418	/* Override the default value for the offset of the program counter
b7247919 MK	419	in the sigcontext structure. */
a3386186	420	offset = offsetof (struct sigcontext, sc_pc);
8201327c	421
a3386186	422	if (SC_PC_OFFSET != offset)
8201327c MK	423	{
	424	warning ("\
	425	offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\
a3386186 MK	426	Please report this to <bug-gdb@gnu.org>.",
a3386186 MK	427	offset, SC_PC_OFFSET);
8201327c MK	428	}
8201327c MK	429
a3386186	430	SC_PC_OFFSET = offset;
6bff26de MK	431
6bff26de MK	432	/* Likewise for the stack pointer. */
a3386186	433	offset = offsetof (struct sigcontext, sc_sp);
6bff26de	434
a3386186	435	if (SC_SP_OFFSET != offset)
6bff26de MK	436	{
	437	warning ("\
	438	offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\
	439	Please report this to <bug-gdb@gnu.org>.",
a3386186 MK	440	offset, SC_SP_OFFSET);
	441	}
	442
	443	SC_SP_OFFSET = offset;
	444
	445	/* And the frame pointer. */
	446	offset = offsetof (struct sigcontext, sc_fp);
	447
	448	if (SC_FP_OFFSET != offset)
	449	{
	450	warning ("\
	451	offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\
	452	Please report this to <bug-gdb@gnu.org>.",
	453	offset, SC_FP_OFFSET);
6bff26de MK	454	}
6bff26de MK	455
a3386186	456	SC_FP_OFFSET = offset;
b7247919	457	}