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a3405d12 JB |
1 | /* Native-dependent code for X86 BSD's. |
2 | ||
b811d2c2 | 3 | Copyright (C) 2003-2020 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 | |
a3405d12 | 43 | |
a379bfd0 JB |
44 | /* Helper macro to access debug register X. FreeBSD/amd64 and modern |
45 | versions of FreeBSD/i386 provide this macro in system headers. Define | |
46 | a local version for systems that do not provide it. */ | |
a3405d12 | 47 | #ifndef DBREG_DRX |
a379bfd0 JB |
48 | #ifdef __NetBSD__ |
49 | #define DBREG_DRX(d, x) ((d)->dr[x]) | |
50 | #else | |
a3405d12 JB |
51 | #define DBREG_DRX(d, x) ((&d->dr0)[x]) |
52 | #endif | |
a379bfd0 | 53 | #endif |
a3405d12 JB |
54 | |
55 | static unsigned long | |
56 | x86bsd_dr_get (ptid_t ptid, int regnum) | |
57 | { | |
58 | struct dbreg dbregs; | |
013f99f0 KR |
59 | #ifdef __NetBSD__ |
60 | int lwp = inferior_ptid.lwp (); | |
61 | #else | |
62 | int lwp = 0; | |
63 | #endif | |
a3405d12 JB |
64 | |
65 | if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid), | |
013f99f0 | 66 | (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1) |
a3405d12 JB |
67 | perror_with_name (_("Couldn't read debug registers")); |
68 | ||
69 | return DBREG_DRX ((&dbregs), regnum); | |
70 | } | |
71 | ||
72 | static void | |
73 | x86bsd_dr_set (int regnum, unsigned long value) | |
74 | { | |
75 | struct dbreg dbregs; | |
013f99f0 KR |
76 | #ifdef __NetBSD__ |
77 | int lwp = inferior_ptid.lwp (); | |
78 | #else | |
79 | int lwp = 0; | |
80 | #endif | |
a3405d12 JB |
81 | |
82 | if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid), | |
013f99f0 | 83 | (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1) |
a3405d12 JB |
84 | perror_with_name (_("Couldn't get debug registers")); |
85 | ||
86 | /* For some mysterious reason, some of the reserved bits in the | |
87 | debug control register get set. Mask these off, otherwise the | |
88 | ptrace call below will fail. */ | |
89 | DBREG_DRX ((&dbregs), 7) &= ~(0xffffffff0000fc00); | |
90 | ||
91 | DBREG_DRX ((&dbregs), regnum) = value; | |
92 | ||
08036331 PA |
93 | for (thread_info *thread : current_inferior ()->non_exited_threads ()) |
94 | { | |
013f99f0 KR |
95 | #ifdef __NetBSD__ |
96 | lwp = thread->ptid.lwp (); | |
97 | #endif | |
98 | ||
08036331 | 99 | if (ptrace (PT_SETDBREGS, get_ptrace_pid (thread->ptid), |
013f99f0 | 100 | (PTRACE_TYPE_ARG3) &dbregs, lwp) == -1) |
08036331 PA |
101 | perror_with_name (_("Couldn't write debug registers")); |
102 | } | |
a3405d12 JB |
103 | } |
104 | ||
105 | static void | |
106 | x86bsd_dr_set_control (unsigned long control) | |
107 | { | |
108 | x86bsd_dr_set (7, control); | |
109 | } | |
110 | ||
111 | static void | |
112 | x86bsd_dr_set_addr (int regnum, CORE_ADDR addr) | |
113 | { | |
114 | gdb_assert (regnum >= 0 && regnum <= 4); | |
115 | ||
116 | x86bsd_dr_set (regnum, addr); | |
117 | } | |
118 | ||
119 | static CORE_ADDR | |
120 | x86bsd_dr_get_addr (int regnum) | |
121 | { | |
122 | return x86bsd_dr_get (inferior_ptid, regnum); | |
123 | } | |
124 | ||
125 | static unsigned long | |
126 | x86bsd_dr_get_status (void) | |
127 | { | |
128 | return x86bsd_dr_get (inferior_ptid, 6); | |
129 | } | |
130 | ||
131 | static unsigned long | |
132 | x86bsd_dr_get_control (void) | |
133 | { | |
134 | return x86bsd_dr_get (inferior_ptid, 7); | |
135 | } | |
136 | ||
137 | #endif /* PT_GETDBREGS */ | |
138 | ||
6c265988 | 139 | void _initialize_x86_bsd_nat (); |
f6ac5f3d PA |
140 | void |
141 | _initialize_x86_bsd_nat () | |
a3405d12 | 142 | { |
a3405d12 | 143 | #ifdef HAVE_PT_GETDBREGS |
a3405d12 JB |
144 | x86_dr_low.set_control = x86bsd_dr_set_control; |
145 | x86_dr_low.set_addr = x86bsd_dr_set_addr; | |
146 | x86_dr_low.get_addr = x86bsd_dr_get_addr; | |
147 | x86_dr_low.get_status = x86bsd_dr_get_status; | |
148 | x86_dr_low.get_control = x86bsd_dr_get_control; | |
149 | x86_set_debug_register_length (sizeof (void *)); | |
a3405d12 | 150 | #endif /* HAVE_PT_GETDBREGS */ |
a3405d12 | 151 | } |