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a3405d12 JB |
1 | /* Native-dependent code for X86 BSD's. |
2 | ||
e2882c85 | 3 | Copyright (C) 2003-2018 Free Software Foundation, Inc. |
a3405d12 JB |
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 3 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, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "inferior.h" | |
5077bfff | 22 | #include "gdbthread.h" |
a3405d12 JB |
23 | |
24 | /* We include <signal.h> to make sure `struct fxsave64' is defined on | |
25 | NetBSD, since NetBSD's <machine/reg.h> needs it. */ | |
26 | #include <signal.h> | |
27 | #include <sys/types.h> | |
28 | #include <sys/ptrace.h> | |
29 | #include <machine/reg.h> | |
30 | ||
31 | #include "x86-nat.h" | |
03b62bbb | 32 | #include "x86-bsd-nat.h" |
a3405d12 JB |
33 | #include "inf-ptrace.h" |
34 | \f | |
35 | ||
36 | #ifdef PT_GETXSTATE_INFO | |
37 | size_t x86bsd_xsave_len; | |
38 | #endif | |
39 | ||
40 | /* Support for debug registers. */ | |
41 | ||
42 | #ifdef HAVE_PT_GETDBREGS | |
43 | static void (*super_mourn_inferior) (struct target_ops *ops); | |
44 | ||
45 | /* Implement the "to_mourn_inferior" target_ops method. */ | |
46 | ||
47 | static void | |
48 | x86bsd_mourn_inferior (struct target_ops *ops) | |
49 | { | |
50 | x86_cleanup_dregs (); | |
51 | super_mourn_inferior (ops); | |
52 | } | |
53 | ||
a379bfd0 JB |
54 | /* Helper macro to access debug register X. FreeBSD/amd64 and modern |
55 | versions of FreeBSD/i386 provide this macro in system headers. Define | |
56 | a local version for systems that do not provide it. */ | |
a3405d12 | 57 | #ifndef DBREG_DRX |
a379bfd0 JB |
58 | #ifdef __NetBSD__ |
59 | #define DBREG_DRX(d, x) ((d)->dr[x]) | |
60 | #else | |
a3405d12 JB |
61 | #define DBREG_DRX(d, x) ((&d->dr0)[x]) |
62 | #endif | |
a379bfd0 | 63 | #endif |
a3405d12 JB |
64 | |
65 | static unsigned long | |
66 | x86bsd_dr_get (ptid_t ptid, int regnum) | |
67 | { | |
68 | struct dbreg dbregs; | |
69 | ||
70 | if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid), | |
71 | (PTRACE_TYPE_ARG3) &dbregs, 0) == -1) | |
72 | perror_with_name (_("Couldn't read debug registers")); | |
73 | ||
74 | return DBREG_DRX ((&dbregs), regnum); | |
75 | } | |
76 | ||
77 | static void | |
78 | x86bsd_dr_set (int regnum, unsigned long value) | |
79 | { | |
5077bfff | 80 | struct thread_info *thread; |
a3405d12 JB |
81 | struct dbreg dbregs; |
82 | ||
83 | if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid), | |
84 | (PTRACE_TYPE_ARG3) &dbregs, 0) == -1) | |
85 | perror_with_name (_("Couldn't get debug registers")); | |
86 | ||
87 | /* For some mysterious reason, some of the reserved bits in the | |
88 | debug control register get set. Mask these off, otherwise the | |
89 | ptrace call below will fail. */ | |
90 | DBREG_DRX ((&dbregs), 7) &= ~(0xffffffff0000fc00); | |
91 | ||
92 | DBREG_DRX ((&dbregs), regnum) = value; | |
93 | ||
5077bfff JB |
94 | ALL_NON_EXITED_THREADS (thread) |
95 | if (thread->inf == current_inferior ()) | |
96 | { | |
97 | if (ptrace (PT_SETDBREGS, get_ptrace_pid (thread->ptid), | |
98 | (PTRACE_TYPE_ARG3) &dbregs, 0) == -1) | |
99 | perror_with_name (_("Couldn't write debug registers")); | |
100 | } | |
a3405d12 JB |
101 | } |
102 | ||
103 | static void | |
104 | x86bsd_dr_set_control (unsigned long control) | |
105 | { | |
106 | x86bsd_dr_set (7, control); | |
107 | } | |
108 | ||
109 | static void | |
110 | x86bsd_dr_set_addr (int regnum, CORE_ADDR addr) | |
111 | { | |
112 | gdb_assert (regnum >= 0 && regnum <= 4); | |
113 | ||
114 | x86bsd_dr_set (regnum, addr); | |
115 | } | |
116 | ||
117 | static CORE_ADDR | |
118 | x86bsd_dr_get_addr (int regnum) | |
119 | { | |
120 | return x86bsd_dr_get (inferior_ptid, regnum); | |
121 | } | |
122 | ||
123 | static unsigned long | |
124 | x86bsd_dr_get_status (void) | |
125 | { | |
126 | return x86bsd_dr_get (inferior_ptid, 6); | |
127 | } | |
128 | ||
129 | static unsigned long | |
130 | x86bsd_dr_get_control (void) | |
131 | { | |
132 | return x86bsd_dr_get (inferior_ptid, 7); | |
133 | } | |
134 | ||
135 | #endif /* PT_GETDBREGS */ | |
136 | ||
137 | /* Create a prototype *BSD/x86 target. The client can override it | |
138 | with local methods. */ | |
139 | ||
140 | struct target_ops * | |
141 | x86bsd_target (void) | |
142 | { | |
143 | struct target_ops *t; | |
144 | ||
145 | t = inf_ptrace_target (); | |
146 | ||
147 | #ifdef HAVE_PT_GETDBREGS | |
148 | x86_use_watchpoints (t); | |
149 | ||
150 | x86_dr_low.set_control = x86bsd_dr_set_control; | |
151 | x86_dr_low.set_addr = x86bsd_dr_set_addr; | |
152 | x86_dr_low.get_addr = x86bsd_dr_get_addr; | |
153 | x86_dr_low.get_status = x86bsd_dr_get_status; | |
154 | x86_dr_low.get_control = x86bsd_dr_get_control; | |
155 | x86_set_debug_register_length (sizeof (void *)); | |
156 | super_mourn_inferior = t->to_mourn_inferior; | |
157 | t->to_mourn_inferior = x86bsd_mourn_inferior; | |
158 | #endif /* HAVE_PT_GETDBREGS */ | |
159 | ||
160 | return t; | |
161 | } |