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/* Native-dependent code for VAX UNIXen (including older BSD's).
Copyright (C) 2004-2013 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 = ptid_get_pid (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;
}
#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));
}
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