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

/* Native-dependent code for VAX UNIXen (including older BSD's).

   Copyright (C) 2004-2005, 2007-2012 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 3 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, see <http://www.gnu.org/licenses/>.  */

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

#include "gdb_assert.h"
#include <sys/types.h>
#include <sys/dir.h>
#include <sys/user.h>

#ifdef HAVE_SYS_PTRACE_H
#include <sys/ptrace.h>
#endif

#ifndef PT_READ_U
#define PT_READ_U 3
#endif

#ifdef SYS_REG_H
/* UNIX 32V and derivatives (including 3BSD).  */
#include <sys/reg.h>
#else
/* 4.2BSD and derivatives.  */
#include <machine/reg.h>
#endif

#include "vax-tdep.h"
#include "inf-ptrace.h"

/* Address of the user structure.  This is the value for 32V; 3BSD
   uses a different value, but hey, who's still using those systems?  */
static CORE_ADDR vax_kernel_u_addr = 0x80020000;

/* Location of the user's stored registers; usage is `u.u_ar0[XX]'.
   For 4.2BSD and ULTRIX these are negative!  See <machine/reg.h>.  */
static int vax_register_index[] =
{
  R0, R1, R2, R3, R4, R5,
  R6, R7, R8, R9, R10, R11,
  AP, FP, SP, PC, PS
};

static CORE_ADDR
vax_register_u_addr (CORE_ADDR u_ar0, int regnum)
{
  gdb_assert (regnum >= 0 && regnum < ARRAY_SIZE (vax_register_index));

  /* Type is `int *u_ar0'.  See <sys/user.h>.  */
  return u_ar0 + vax_register_index[regnum - VAX_R0_REGNUM] * 4;
}

static CORE_ADDR
vax_register_u_offset (struct gdbarch *gdbarch, int regnum, int store_p)
{
  size_t u_ar0_offset = offsetof (struct user, u_ar0);
  CORE_ADDR u_ar0;
  int pid;

  errno = 0;
  pid = PIDGET (inferior_ptid);
  u_ar0 = ptrace (PT_READ_U, pid, u_ar0_offset, 0);
  if (errno)
    perror_with_name (_("Unable to determine location of registers"));

  return vax_register_u_addr (u_ar0, regnum) - vax_kernel_u_addr;
}
\f

#include <nlist.h>

#ifndef _PATH_UNIX
#define _PATH_UNIX "/vmunix"
#endif

/* Provide a prototype to silence -Wmissing-prototypes.  */
void _initialize_vax_nat (void);

void
_initialize_vax_nat (void)
{
  struct nlist names[2];

  names[0].n_name = "_u";
  names[1].n_name = NULL;
  if (nlist (_PATH_UNIX, names) == 0)
    vax_kernel_u_addr = names[0].n_value;

  add_target (inf_ptrace_trad_target (vax_register_u_offset));
}
Commit	Line	Data
	1	/* Native-dependent code for VAX UNIXen (including older BSD's).
	2
	3	Copyright (C) 2004-2005, 2007-2012 Free Software Foundation, Inc.
	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 3 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, see <http://www.gnu.org/licenses/>. */
	19
	20	#include "defs.h"
	21	#include "inferior.h"
	22
	23	#include "gdb_assert.h"
	24	#include <sys/types.h>
	25	#include <sys/dir.h>
	26	#include <sys/user.h>
	27
	28	#ifdef HAVE_SYS_PTRACE_H
	29	#include <sys/ptrace.h>
	30	#endif
	31
	32	#ifndef PT_READ_U
	33	#define PT_READ_U 3
	34	#endif
	35
	36	#ifdef SYS_REG_H
	37	/* UNIX 32V and derivatives (including 3BSD). */
	38	#include <sys/reg.h>
	39	#else
	40	/* 4.2BSD and derivatives. */
	41	#include <machine/reg.h>
	42	#endif
	43
	44	#include "vax-tdep.h"
	45	#include "inf-ptrace.h"
	46
	47	/* Address of the user structure. This is the value for 32V; 3BSD
	48	uses a different value, but hey, who's still using those systems? */
	49	static CORE_ADDR vax_kernel_u_addr = 0x80020000;
	50
	51	/* Location of the user's stored registers; usage is `u.u_ar0[XX]'.
	52	For 4.2BSD and ULTRIX these are negative! See <machine/reg.h>. */
	53	static int vax_register_index[] =
	54	{
	55	R0, R1, R2, R3, R4, R5,
	56	R6, R7, R8, R9, R10, R11,
	57	AP, FP, SP, PC, PS
	58	};
	59
	60	static CORE_ADDR
	61	vax_register_u_addr (CORE_ADDR u_ar0, int regnum)
	62	{
	63	gdb_assert (regnum >= 0 && regnum < ARRAY_SIZE (vax_register_index));
	64
	65	/* Type is `int u_ar0'. See <sys/user.h>. /
	66	return u_ar0 + vax_register_index[regnum - VAX_R0_REGNUM] * 4;
	67	}
	68
	69	static CORE_ADDR
	70	vax_register_u_offset (struct gdbarch *gdbarch, int regnum, int store_p)
	71	{
	72	size_t u_ar0_offset = offsetof (struct user, u_ar0);
	73	CORE_ADDR u_ar0;
	74	int pid;
	75
	76	errno = 0;
	77	pid = PIDGET (inferior_ptid);
	78	u_ar0 = ptrace (PT_READ_U, pid, u_ar0_offset, 0);
	79	if (errno)
	80	perror_with_name (_("Unable to determine location of registers"));
	81
	82	return vax_register_u_addr (u_ar0, regnum) - vax_kernel_u_addr;
	83	}
	84	\f
	85
	86	#include <nlist.h>
	87
	88	#ifndef _PATH_UNIX
	89	#define _PATH_UNIX "/vmunix"
	90	#endif
	91
	92	/* Provide a prototype to silence -Wmissing-prototypes. */
	93	void _initialize_vax_nat (void);
	94
	95	void
	96	_initialize_vax_nat (void)
	97	{
	98	struct nlist names[2];
	99
	100	names[0].n_name = "_u";
	101	names[1].n_name = NULL;
	102	if (nlist (_PATH_UNIX, names) == 0)
	103	vax_kernel_u_addr = names[0].n_value;
	104
	105	add_target (inf_ptrace_trad_target (vax_register_u_offset));
	106	}