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109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
/* Native-dependent code for VAX UNIXen (including older BSD's).
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Copyright (C) 2004, 2005, 2007 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "defs.h"
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#include "inferior.h"
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#include "gdb_assert.h"
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#include <sys/types.h>
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#include <sys/dir.h>
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#include <sys/user.h>
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#ifdef HAVE_SYS_PTRACE_H
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#include <sys/ptrace.h>
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#endif
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#ifndef PT_READ_U
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#define PT_READ_U 3
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#endif
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#ifdef SYS_REG_H
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/* UNIX 32V and derivatives (including 3BSD). */
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#include <sys/reg.h>
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#else
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/* 4.2BSD and derivatives. */
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#include <machine/reg.h>
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#endif
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#include "vax-tdep.h"
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#include "inf-ptrace.h"
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/* Address of the user structure. This is the the value for 32V; 3BSD
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uses a different value, but hey, who's still using those systems? */
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CORE_ADDR vax_kernel_u_addr = 0x80020000;
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/* Location of the user's stored registers; usage is `u.u_ar0[XX]'.
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For 4.2BSD and ULTRIX these are negative! See <machine/reg.h>. */
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static int vax_register_index[] =
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{
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R0, R1, R2, R3, R4, R5,
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R6, R7, R8, R9, R10, R11,
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AP, FP, SP, PC, PS
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};
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CORE_ADDR
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vax_register_u_addr (CORE_ADDR u_ar0, int regnum)
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{
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gdb_assert (regnum >= 0 && regnum < ARRAY_SIZE (vax_register_index));
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/* Type is `int *u_ar0'. See <sys/user.h>. */
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return u_ar0 + vax_register_index[regnum - VAX_R0_REGNUM] * 4;
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}
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static CORE_ADDR
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vax_register_u_offset (int regnum)
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{
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size_t u_ar0_offset = offsetof (struct user, u_ar0);
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CORE_ADDR u_ar0;
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int pid;
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errno = 0;
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pid = PIDGET (inferior_ptid);
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u_ar0 = ptrace (PT_READ_U, pid, u_ar0_offset, 0);
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if (errno)
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perror_with_name (_("Unable to determine location of registers"));
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return vax_register_u_addr (u_ar0, regnum) - vax_kernel_u_addr;
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}
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#include <nlist.h>
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#ifndef _PATH_UNIX
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#define _PATH_UNIX "/vmunix"
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#endif
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_vax_nat (void);
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void
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_initialize_vax_nat (void)
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{
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struct nlist names[2];
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names[0].n_name = "_u";
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names[1].n_name = NULL;
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if (nlist (_PATH_UNIX, names) == 0)
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vax_kernel_u_addr = names[0].n_value;
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add_target (inf_ptrace_trad_target (vax_register_u_offset));
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}
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