[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 "i386-tdep.h"
#include "i387-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.  */

static 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.  */

static 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));
}


/* 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
57976e88	46	#include "i386-tdep.h"
1fc7d519	47	#include "i387-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. /
e6031aeb MK	122
1fc7d519	123	static void
e6031aeb MK	124	supply_gregset (gregset_t *gregsetp)
e6031aeb MK	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. */
e6031aeb MK	141
1fc7d519	142	static 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
e6031aeb	153
e6031aeb	154
283accbc	155	/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
e6031aeb MK	156	for all registers (including the floating point registers). */
	157
	158	void
283accbc	159	fetch_inferior_registers (int regnum)
e6031aeb	160	{
283accbc	161	if (regnum == -1 \|\| GETREGS_SUPPLIES (regnum))
7e89e357 JT	162	{
	163	gregset_t gregs;
	164
	165	if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
	166	(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
	167	perror_with_name ("Couldn't get registers");
e6031aeb	168
7e89e357	169	supply_gregset (&gregs);
283accbc	170	if (regnum != -1)
7e89e357 JT	171	return;
7e89e357 JT	172	}
e6031aeb	173
283accbc	174	if (regnum == -1 \|\| regnum >= I386_ST0_REGNUM)
e6031aeb MK	175	{
e6031aeb MK	176	fpregset_t fpregs;
7e89e357 JT	177	#ifdef HAVE_PT_GETXMMREGS
	178	char xmmregs[512];
	179
a144416f MK	180	if (have_ptrace_xmmregs != 0
	181	&& ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
	182	(PTRACE_ARG3_TYPE) xmmregs, 0) == 0)
7e89e357 JT	183	{
7e89e357 JT	184	have_ptrace_xmmregs = 1;
41d041d6	185	i387_supply_fxsave (current_regcache, -1, xmmregs);
7e89e357 JT	186	}
	187	else
	188	{
	189	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
	190	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	191	perror_with_name ("Couldn't get floating point status");
e6031aeb	192
41d041d6	193	i387_supply_fsave (current_regcache, -1, &fpregs);
7e89e357 JT	194	}
7e89e357 JT	195	#else
39f77062	196	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
e6031aeb MK	197	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	198	perror_with_name ("Couldn't get floating point status");
	199
41d041d6	200	i387_supply_fsave (current_regcache, -1, &fpregs);
7e89e357	201	#endif
e6031aeb	202	}
b051bfa4	203	}
e6031aeb	204
283accbc	205	/* Store register REGNUM back into the inferior. If REGNUM is -1, do
e6031aeb MK	206	this for all registers (including the floating point registers). */
	207
	208	void
283accbc	209	store_inferior_registers (int regnum)
e6031aeb	210	{
283accbc	211	if (regnum == -1 \|\| GETREGS_SUPPLIES (regnum))
7e89e357 JT	212	{
	213	gregset_t gregs;
	214
	215	if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
	216	(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
	217	perror_with_name ("Couldn't get registers");
e6031aeb	218
283accbc	219	fill_gregset (&gregs, regnum);
e6031aeb	220
7e89e357 JT	221	if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
	222	(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
	223	perror_with_name ("Couldn't write registers");
	224
283accbc	225	if (regnum != -1)
7e89e357 JT	226	return;
7e89e357 JT	227	}
e6031aeb	228
283accbc	229	if (regnum == -1 \|\| regnum >= I386_ST0_REGNUM)
e6031aeb MK	230	{
e6031aeb MK	231	fpregset_t fpregs;
7e89e357 JT	232	#ifdef HAVE_PT_GETXMMREGS
7e89e357 JT	233	char xmmregs[512];
e6031aeb	234
a144416f MK	235	if (have_ptrace_xmmregs != 0
	236	&& ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
	237	(PTRACE_ARG3_TYPE) xmmregs, 0) == 0)
7e89e357 JT	238	{
	239	have_ptrace_xmmregs = 1;
	240
283accbc	241	i387_collect_fxsave (current_regcache, regnum, xmmregs);
e6031aeb	242
7e89e357 JT	243	if (ptrace (PT_SETXMMREGS, PIDGET (inferior_ptid),
	244	(PTRACE_ARG3_TYPE) xmmregs, 0) == -1)
	245	perror_with_name ("Couldn't write XMM registers");
	246	}
	247	else
	248	{
	249	have_ptrace_xmmregs = 0;
	250	#endif
	251	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
	252	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	253	perror_with_name ("Couldn't get floating point status");
	254
283accbc	255	i387_collect_fsave (current_regcache, regnum, &fpregs);
f5b1afdf	256
7e89e357 JT	257	if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
	258	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	259	perror_with_name ("Couldn't write floating point status");
	260	#ifdef HAVE_PT_GETXMMREGS
	261	}
	262	#endif
e6031aeb MK	263	}
	264	}
	265	\f
	266
0afdd437 MK	267	/* Support for debug registers. */
	268
	269	#ifdef HAVE_PT_GETDBREGS
	270
	271	/* Not all versions of FreeBSD/i386 that support the debug registers
	272	have this macro. */
	273	#ifndef DBREG_DRX
	274	#define DBREG_DRX(d, x) ((&d->dr0)[x])
	275	#endif
	276
	277	static void
	278	i386bsd_dr_set (int regnum, unsigned int value)
	279	{
	280	struct dbreg dbregs;
	281
39f77062 KB	282	if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
39f77062 KB	283	(PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
0afdd437 MK	284	perror_with_name ("Couldn't get debug registers");
	285
	286	/* For some mysterious reason, some of the reserved bits in the
	287	debug control register get set. Mask these off, otherwise the
	288	ptrace call below will fail. */
afdb036a	289	DBREG_DRX ((&dbregs), 7) &= ~(0x0000fc00);
0afdd437 MK	290
	291	DBREG_DRX ((&dbregs), regnum) = value;
	292
39f77062 KB	293	if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid),
39f77062 KB	294	(PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
0afdd437 MK	295	perror_with_name ("Couldn't write debug registers");
	296	}
	297
	298	void
	299	i386bsd_dr_set_control (unsigned long control)
	300	{
	301	i386bsd_dr_set (7, control);
	302	}
	303
	304	void
	305	i386bsd_dr_set_addr (int regnum, CORE_ADDR addr)
	306	{
	307	gdb_assert (regnum >= 0 && regnum <= 4);
	308
	309	i386bsd_dr_set (regnum, addr);
	310	}
	311
	312	void
	313	i386bsd_dr_reset_addr (int regnum)
	314	{
	315	gdb_assert (regnum >= 0 && regnum <= 4);
	316
	317	i386bsd_dr_set (regnum, 0);
	318	}
	319
	320	unsigned long
	321	i386bsd_dr_get_status (void)
	322	{
	323	struct dbreg dbregs;
	324
	325	/* FIXME: kettenis/2001-03-31: Calling perror_with_name if the
	326	ptrace call fails breaks debugging remote targets. The correct
	327	way to fix this is to add the hardware breakpoint and watchpoint
b7247919	328	stuff to the target vector. For now, just return zero if the
0afdd437	329	ptrace call fails. */
39f77062 KB	330	if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
39f77062 KB	331	(PTRACE_ARG3_TYPE) & dbregs, 0) == -1)
0afdd437 MK	332	#if 0
	333	perror_with_name ("Couldn't read debug registers");
	334	#else
	335	return 0;
	336	#endif
	337
afdb036a	338	return DBREG_DRX ((&dbregs), 6);
0afdd437 MK	339	}
	340
	341	#endif /* PT_GETDBREGS */
	342	\f
	343
e6031aeb MK	344	/* Support for the user struct. */
e6031aeb MK	345
283accbc	346	/* Return the address register REGNUM. BLOCKEND is the value of
e6031aeb MK	347	u.u_ar0, which should point to the registers. */
	348
	349	CORE_ADDR
283accbc	350	register_u_addr (CORE_ADDR blockend, int regnum)
e6031aeb	351	{
283accbc	352	return (CORE_ADDR) REG_ADDR (blockend, regnum);
e6031aeb MK	353	}
	354
	355	#include <sys/param.h>
	356	#include <sys/user.h>
	357
	358	/* Return the size of the user struct. */
	359
	360	int
	361	kernel_u_size (void)
	362	{
	363	return (sizeof (struct user));
	364	}
b7247919	365	\f
b7247919 MK	366	void
	367	_initialize_i386bsd_nat (void)
	368	{
a3386186	369	int offset;
8201327c	370
b7247919 MK	371	/* To support the recognition of signal handlers, i386bsd-tdep.c
	372	hardcodes some constants. Inclusion of this file means that we
	373	are compiling a native debugger, which means that we can use the
	374	system header files and sysctl(3) to get at the relevant
	375	information. */
	376
8201327c	377	#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
a3386186 MK	378	#define SC_REG_OFFSET i386fbsd4_sc_reg_offset
a3386186 MK	379	#elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005
a3386186	380	#define SC_REG_OFFSET i386fbsd_sc_reg_offset
005328e3	381	#elif defined (NetBSD) \|\| defined (__NetBSD_Version__)
a3386186	382	#define SC_REG_OFFSET i386nbsd_sc_reg_offset
005328e3	383	#elif defined (OpenBSD)
a3386186	384	#define SC_REG_OFFSET i386obsd_sc_reg_offset
8201327c	385	#else
a144416f	386	#define SC_REG_OFFSET i386bsd_sc_reg_offset
8201327c MK	387	#endif
8201327c MK	388
a3386186 MK	389	/* We only check the program counter, stack pointer and frame
	390	pointer since these members of `struct sigcontext' are essential
	391	for providing backtraces. More checks could be added, but would
	392	involve adding configure checks for the appropriate structure
	393	members, since older BSD's don't provide all of them. */
	394
	395	#define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM]
	396	#define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM]
	397	#define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM]
	398
b7247919 MK	399	/* Override the default value for the offset of the program counter
b7247919 MK	400	in the sigcontext structure. */
a3386186	401	offset = offsetof (struct sigcontext, sc_pc);
8201327c	402
a3386186	403	if (SC_PC_OFFSET != offset)
8201327c MK	404	{
	405	warning ("\
	406	offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\
a3386186 MK	407	Please report this to <bug-gdb@gnu.org>.",
a3386186 MK	408	offset, SC_PC_OFFSET);
8201327c MK	409	}
8201327c MK	410
a3386186	411	SC_PC_OFFSET = offset;
6bff26de MK	412
6bff26de MK	413	/* Likewise for the stack pointer. */
a3386186	414	offset = offsetof (struct sigcontext, sc_sp);
6bff26de	415
a3386186	416	if (SC_SP_OFFSET != offset)
6bff26de MK	417	{
	418	warning ("\
	419	offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\
	420	Please report this to <bug-gdb@gnu.org>.",
a3386186 MK	421	offset, SC_SP_OFFSET);
	422	}
	423
	424	SC_SP_OFFSET = offset;
	425
	426	/* And the frame pointer. */
	427	offset = offsetof (struct sigcontext, sc_fp);
	428
	429	if (SC_FP_OFFSET != offset)
	430	{
	431	warning ("\
	432	offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\
	433	Please report this to <bug-gdb@gnu.org>.",
	434	offset, SC_FP_OFFSET);
6bff26de MK	435	}
6bff26de MK	436
a3386186	437	SC_FP_OFFSET = offset;
b7247919	438	}