1 /* Native-dependent code for VAX UNIXen (including older BSD's).
3 Copyright (C) 2004-2014 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
23 #include <sys/types.h>
27 #ifdef HAVE_SYS_PTRACE_H
28 #include <sys/ptrace.h>
36 /* UNIX 32V and derivatives (including 3BSD). */
39 /* 4.2BSD and derivatives. */
40 #include <machine/reg.h>
44 #include "inf-ptrace.h"
46 /* Address of the user structure. This is the value for 32V; 3BSD
47 uses a different value, but hey, who's still using those systems? */
48 static CORE_ADDR vax_kernel_u_addr = 0x80020000;
50 /* Location of the user's stored registers; usage is `u.u_ar0[XX]'.
51 For 4.2BSD and ULTRIX these are negative! See <machine/reg.h>. */
52 static int vax_register_index[] =
54 R0, R1, R2, R3, R4, R5,
55 R6, R7, R8, R9, R10, R11,
60 vax_register_u_addr (CORE_ADDR u_ar0, int regnum)
62 gdb_assert (regnum >= 0 && regnum < ARRAY_SIZE (vax_register_index));
64 /* Type is `int *u_ar0'. See <sys/user.h>. */
65 return u_ar0 + vax_register_index[regnum - VAX_R0_REGNUM] * 4;
69 vax_register_u_offset (struct gdbarch *gdbarch, int regnum, int store_p)
71 size_t u_ar0_offset = offsetof (struct user, u_ar0);
76 pid = ptid_get_pid (inferior_ptid);
77 u_ar0 = ptrace (PT_READ_U, pid, u_ar0_offset, 0);
79 perror_with_name (_("Unable to determine location of registers"));
81 return vax_register_u_addr (u_ar0, regnum) - vax_kernel_u_addr;
88 #define _PATH_UNIX "/vmunix"
91 /* Provide a prototype to silence -Wmissing-prototypes. */
92 void _initialize_vax_nat (void);
95 _initialize_vax_nat (void)
97 struct nlist names[2];
99 names[0].n_name = "_u";
100 names[1].n_name = NULL;
101 if (nlist (_PATH_UNIX, names) == 0)
102 vax_kernel_u_addr = names[0].n_value;
104 add_target (inf_ptrace_trad_target (vax_register_u_offset));