1 /* Native-dependent code for VAX UNIXen (including older BSD's).
2
3 Copyright 2004 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 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"
24
25 #include "gdb_assert.h"
26 #include <sys/types.h>
27 #include <sys/dir.h>
28 #include <sys/user.h>
29
30 #ifdef HAVE_SYS_PTRACE_H
31 #include <sys/ptrace.h>
32 #endif
33
34 #ifndef PT_READ_U
35 #define PT_READ_U 3
36 #endif
37
38 #ifdef SYS_REG_H
39 /* UNIX 32V and derivatives (including 3BSD). */
40 #include <sys/reg.h>
41 #else
42 /* 4.2BSD and derivatives. */
43 #include <machine/reg.h>
44 #endif
45
46 #include "vax-tdep.h"
47
48 /* Address of the user structure. This is the the value for 32V; 3BSD
49 uses a different value, but hey, who's still using those systems? */
50 CORE_ADDR vax_kernel_u_addr = 0x80020000;
51
52 /* Location of the user's stored registers; usage is `u.u_ar0[XX]'.
53 For 4.2BSD and ULTRIX these are negative! See <machine/reg.h>. */
54 static int vax_register_index[] =
55 {
56 R0, R1, R2, R3, R4, R5,
57 R6, R7, R8, R9, R10, R11,
58 AP, FP, SP, PC, PS
59 };
60
61 CORE_ADDR
vax_register_u_addr(CORE_ADDR u_ar0,int regnum)62 vax_register_u_addr (CORE_ADDR u_ar0, int regnum)
63 {
64 gdb_assert (regnum >= 0 && regnum < ARRAY_SIZE (vax_register_index));
65
66 /* Type is `int *u_ar0'. See <sys/user.h>. */
67 return u_ar0 + vax_register_index[regnum - VAX_R0_REGNUM] * 4;
68 }
69
70
71 CORE_ADDR
vax_register_u_offset(int regnum)72 vax_register_u_offset (int regnum)
73 {
74 size_t u_ar0_offset = offsetof (struct user, u_ar0);
75 CORE_ADDR u_ar0;
76 int pid;
77
78 errno = 0;
79 pid = PIDGET (inferior_ptid);
80 u_ar0 = ptrace (PT_READ_U, pid, u_ar0_offset, 0);
81 if (errno)
82 perror_with_name ("Unable to determine location of registers");
83
84 return vax_register_u_addr (u_ar0, regnum) - vax_kernel_u_addr;
85 }
86
87
88 #include <nlist.h>
89
90 #ifndef _PATH_UNIX
91 #define _PATH_UNIX "/vmunix"
92 #endif
93
94 /* Provide a prototype to silence -Wmissing-prototypes. */
95 void _initialize_vax_nat (void);
96
97 void
_initialize_vax_nat(void)98 _initialize_vax_nat (void)
99 {
100 struct nlist names[2];
101
102 names[0].n_name = "_u";
103 names[1].n_name = NULL;
104 if (nlist (_PATH_UNIX, names) == 0)
105 vax_kernel_u_addr = names[0].n_value;
106 }
107