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1 | /* Native-dependent code for VAX UNIXen (including older BSD's). |
2 | ||
ecd75fc8 | 3 | Copyright (C) 2004-2014 Free Software Foundation, Inc. |
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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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
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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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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19 | |
20 | #include "defs.h" | |
21 | #include "inferior.h" | |
22 | ||
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23 | #include <sys/types.h> |
24 | #include <sys/dir.h> | |
25 | #include <sys/user.h> | |
26 | ||
27 | #ifdef HAVE_SYS_PTRACE_H | |
28 | #include <sys/ptrace.h> | |
29 | #endif | |
30 | ||
31 | #ifndef PT_READ_U | |
32 | #define PT_READ_U 3 | |
33 | #endif | |
34 | ||
35 | #ifdef SYS_REG_H | |
36 | /* UNIX 32V and derivatives (including 3BSD). */ | |
37 | #include <sys/reg.h> | |
38 | #else | |
39 | /* 4.2BSD and derivatives. */ | |
40 | #include <machine/reg.h> | |
41 | #endif | |
42 | ||
43 | #include "vax-tdep.h" | |
2a2de4ce | 44 | #include "inf-ptrace.h" |
b9e1c0d6 | 45 | |
b021a221 | 46 | /* Address of the user structure. This is the value for 32V; 3BSD |
b9e1c0d6 | 47 | uses a different value, but hey, who's still using those systems? */ |
de732108 | 48 | static CORE_ADDR vax_kernel_u_addr = 0x80020000; |
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49 | |
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[] = | |
53 | { | |
54 | R0, R1, R2, R3, R4, R5, | |
55 | R6, R7, R8, R9, R10, R11, | |
56 | AP, FP, SP, PC, PS | |
57 | }; | |
58 | ||
de732108 | 59 | static CORE_ADDR |
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60 | vax_register_u_addr (CORE_ADDR u_ar0, int regnum) |
61 | { | |
62 | gdb_assert (regnum >= 0 && regnum < ARRAY_SIZE (vax_register_index)); | |
63 | ||
64 | /* Type is `int *u_ar0'. See <sys/user.h>. */ | |
65 | return u_ar0 + vax_register_index[regnum - VAX_R0_REGNUM] * 4; | |
66 | } | |
b9e1c0d6 | 67 | |
2a2de4ce | 68 | static CORE_ADDR |
7714d83a | 69 | vax_register_u_offset (struct gdbarch *gdbarch, int regnum, int store_p) |
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70 | { |
71 | size_t u_ar0_offset = offsetof (struct user, u_ar0); | |
72 | CORE_ADDR u_ar0; | |
73 | int pid; | |
74 | ||
75 | errno = 0; | |
dfd4cc63 | 76 | pid = ptid_get_pid (inferior_ptid); |
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77 | u_ar0 = ptrace (PT_READ_U, pid, u_ar0_offset, 0); |
78 | if (errno) | |
e2e0b3e5 | 79 | perror_with_name (_("Unable to determine location of registers")); |
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80 | |
81 | return vax_register_u_addr (u_ar0, regnum) - vax_kernel_u_addr; | |
82 | } | |
83 | \f | |
84 | ||
85 | #include <nlist.h> | |
86 | ||
87 | #ifndef _PATH_UNIX | |
88 | #define _PATH_UNIX "/vmunix" | |
89 | #endif | |
90 | ||
91 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
92 | void _initialize_vax_nat (void); | |
93 | ||
94 | void | |
95 | _initialize_vax_nat (void) | |
96 | { | |
97 | struct nlist names[2]; | |
98 | ||
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; | |
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103 | |
104 | add_target (inf_ptrace_trad_target (vax_register_u_offset)); | |
b9e1c0d6 | 105 | } |