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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 | ||
1ff700c2 | 36 | static PTRACE_TYPE_RET |
fcc7376e KR |
37 | gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr) |
38 | { | |
39 | #ifdef __NetBSD__ | |
40 | /* Support for NetBSD threads: unlike other ptrace implementations in this | |
41 | file, NetBSD requires that we pass both the pid and lwp. */ | |
42 | return ptrace (request, ptid.pid (), addr, ptid.lwp ()); | |
43 | #else | |
44 | pid_t pid = get_ptrace_pid (ptid); | |
45 | return ptrace (request, pid, addr, 0); | |
46 | #endif | |
47 | } | |
48 | ||
a3405d12 JB |
49 | #ifdef PT_GETXSTATE_INFO |
50 | size_t x86bsd_xsave_len; | |
51 | #endif | |
52 | ||
53 | /* Support for debug registers. */ | |
54 | ||
55 | #ifdef HAVE_PT_GETDBREGS | |
a3405d12 | 56 | |
a379bfd0 JB |
57 | /* Helper macro to access debug register X. FreeBSD/amd64 and modern |
58 | versions of FreeBSD/i386 provide this macro in system headers. Define | |
59 | a local version for systems that do not provide it. */ | |
a3405d12 | 60 | #ifndef DBREG_DRX |
a379bfd0 JB |
61 | #ifdef __NetBSD__ |
62 | #define DBREG_DRX(d, x) ((d)->dr[x]) | |
63 | #else | |
a3405d12 JB |
64 | #define DBREG_DRX(d, x) ((&d->dr0)[x]) |
65 | #endif | |
a379bfd0 | 66 | #endif |
a3405d12 JB |
67 | |
68 | static unsigned long | |
69 | x86bsd_dr_get (ptid_t ptid, int regnum) | |
70 | { | |
71 | struct dbreg dbregs; | |
72 | ||
fcc7376e | 73 | if (gdb_ptrace (PT_GETDBREGS, ptid, (PTRACE_TYPE_ARG3) &dbregs) == -1) |
a3405d12 JB |
74 | perror_with_name (_("Couldn't read debug registers")); |
75 | ||
76 | return DBREG_DRX ((&dbregs), regnum); | |
77 | } | |
78 | ||
79 | static void | |
fcc7376e | 80 | x86bsd_dr_set (ptid_t ptid, int regnum, unsigned long value) |
a3405d12 JB |
81 | { |
82 | struct dbreg dbregs; | |
83 | ||
fcc7376e | 84 | if (gdb_ptrace (PT_GETDBREGS, ptid, (PTRACE_TYPE_ARG3) &dbregs) == -1) |
a3405d12 JB |
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 | ||
08036331 PA |
94 | for (thread_info *thread : current_inferior ()->non_exited_threads ()) |
95 | { | |
fcc7376e KR |
96 | if (gdb_ptrace (PT_SETDBREGS, thread->ptid, |
97 | (PTRACE_TYPE_ARG3) &dbregs) == -1) | |
08036331 PA |
98 | perror_with_name (_("Couldn't write debug registers")); |
99 | } | |
a3405d12 JB |
100 | } |
101 | ||
102 | static void | |
103 | x86bsd_dr_set_control (unsigned long control) | |
104 | { | |
fcc7376e | 105 | x86bsd_dr_set (inferior_ptid, 7, control); |
a3405d12 JB |
106 | } |
107 | ||
108 | static void | |
109 | x86bsd_dr_set_addr (int regnum, CORE_ADDR addr) | |
110 | { | |
111 | gdb_assert (regnum >= 0 && regnum <= 4); | |
112 | ||
fcc7376e | 113 | x86bsd_dr_set (inferior_ptid, regnum, addr); |
a3405d12 JB |
114 | } |
115 | ||
116 | static CORE_ADDR | |
117 | x86bsd_dr_get_addr (int regnum) | |
118 | { | |
119 | return x86bsd_dr_get (inferior_ptid, regnum); | |
120 | } | |
121 | ||
122 | static unsigned long | |
123 | x86bsd_dr_get_status (void) | |
124 | { | |
125 | return x86bsd_dr_get (inferior_ptid, 6); | |
126 | } | |
127 | ||
128 | static unsigned long | |
129 | x86bsd_dr_get_control (void) | |
130 | { | |
131 | return x86bsd_dr_get (inferior_ptid, 7); | |
132 | } | |
133 | ||
134 | #endif /* PT_GETDBREGS */ | |
135 | ||
6c265988 | 136 | void _initialize_x86_bsd_nat (); |
f6ac5f3d PA |
137 | void |
138 | _initialize_x86_bsd_nat () | |
a3405d12 | 139 | { |
a3405d12 | 140 | #ifdef HAVE_PT_GETDBREGS |
a3405d12 JB |
141 | x86_dr_low.set_control = x86bsd_dr_set_control; |
142 | x86_dr_low.set_addr = x86bsd_dr_set_addr; | |
143 | x86_dr_low.get_addr = x86bsd_dr_get_addr; | |
144 | x86_dr_low.get_status = x86bsd_dr_get_status; | |
145 | x86_dr_low.get_control = x86bsd_dr_get_control; | |
146 | x86_set_debug_register_length (sizeof (void *)); | |
a3405d12 | 147 | #endif /* HAVE_PT_GETDBREGS */ |
a3405d12 | 148 | } |