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58caa3dc DJ |
1 | /* GNU/Linux/x86-64 specific low level interface, for the remote server |
2 | for GDB. | |
6f0f660e | 3 | Copyright (C) 2002, 2004, 2005 |
58caa3dc DJ |
4 | Free Software Foundation, Inc. |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
6f0f660e EZ |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
58caa3dc DJ |
22 | |
23 | #include "server.h" | |
24 | #include "linux-low.h" | |
25 | #include "i387-fp.h" | |
26 | ||
fd500816 DJ |
27 | /* Correct for all GNU/Linux targets (for quite some time). */ |
28 | #define GDB_GREGSET_T elf_gregset_t | |
29 | #define GDB_FPREGSET_T elf_fpregset_t | |
30 | ||
31 | #ifndef HAVE_ELF_FPREGSET_T | |
32 | /* Make sure we have said types. Not all platforms bring in <linux/elf.h> | |
33 | via <sys/procfs.h>. */ | |
34 | #ifdef HAVE_LINUX_ELF_H | |
35 | #include <linux/elf.h> | |
36 | #endif | |
37 | #endif | |
38 | ||
39 | #include "../gdb_proc_service.h" | |
40 | ||
58caa3dc DJ |
41 | #include <sys/reg.h> |
42 | #include <sys/procfs.h> | |
43 | #include <sys/ptrace.h> | |
44 | ||
fd500816 DJ |
45 | /* This definition comes from prctl.h, but some kernels may not have it. */ |
46 | #ifndef PTRACE_ARCH_PRCTL | |
47 | #define PTRACE_ARCH_PRCTL 30 | |
48 | #endif | |
49 | ||
43360365 JB |
50 | /* The following definitions come from prctl.h, but may be absent |
51 | for certain configurations. */ | |
52 | #ifndef ARCH_GET_FS | |
53 | #define ARCH_SET_GS 0x1001 | |
54 | #define ARCH_SET_FS 0x1002 | |
55 | #define ARCH_GET_FS 0x1003 | |
56 | #define ARCH_GET_GS 0x1004 | |
57 | #endif | |
58 | ||
09ec9b38 | 59 | static int x86_64_regmap[] = { |
638c1580 ML |
60 | RAX * 8, RBX * 8, RCX * 8, RDX * 8, |
61 | RSI * 8, RDI * 8, RBP * 8, RSP * 8, | |
62 | R8 * 8, R9 * 8, R10 * 8, R11 * 8, | |
63 | R12 * 8, R13 * 8, R14 * 8, R15 * 8, | |
09ec9b38 | 64 | RIP * 8, EFLAGS * 8, CS * 8, SS * 8, |
638c1580 | 65 | DS * 8, ES * 8, FS * 8, GS * 8 |
58caa3dc DJ |
66 | }; |
67 | ||
09ec9b38 ML |
68 | #define X86_64_NUM_GREGS (sizeof(x86_64_regmap)/sizeof(int)) |
69 | ||
fd500816 DJ |
70 | /* Called by libthread_db. */ |
71 | ||
72 | ps_err_e | |
73 | ps_get_thread_area (const struct ps_prochandle *ph, | |
74 | lwpid_t lwpid, int idx, void **base) | |
75 | { | |
76 | switch (idx) | |
77 | { | |
78 | case FS: | |
79 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0) | |
80 | return PS_OK; | |
81 | break; | |
82 | case GS: | |
83 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0) | |
84 | return PS_OK; | |
85 | break; | |
86 | default: | |
87 | return PS_BADADDR; | |
88 | } | |
89 | return PS_ERR; | |
90 | } | |
91 | ||
58caa3dc DJ |
92 | static void |
93 | x86_64_fill_gregset (void *buf) | |
94 | { | |
95 | int i; | |
96 | ||
de220d0f | 97 | for (i = 0; i < X86_64_NUM_GREGS; i++) |
2ec06d2e | 98 | collect_register (i, ((char *) buf) + x86_64_regmap[i]); |
58caa3dc DJ |
99 | } |
100 | ||
101 | static void | |
638c1580 | 102 | x86_64_store_gregset (const void *buf) |
58caa3dc DJ |
103 | { |
104 | int i; | |
105 | ||
de220d0f | 106 | for (i = 0; i < X86_64_NUM_GREGS; i++) |
2ec06d2e | 107 | supply_register (i, ((char *) buf) + x86_64_regmap[i]); |
58caa3dc DJ |
108 | } |
109 | ||
110 | static void | |
111 | x86_64_fill_fpregset (void *buf) | |
112 | { | |
113 | i387_cache_to_fxsave (buf); | |
114 | } | |
115 | ||
116 | static void | |
638c1580 | 117 | x86_64_store_fpregset (const void *buf) |
58caa3dc DJ |
118 | { |
119 | i387_fxsave_to_cache (buf); | |
120 | } | |
121 | ||
58caa3dc DJ |
122 | struct regset_info target_regsets[] = { |
123 | { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t), | |
0d62e5e8 | 124 | GENERAL_REGS, |
58caa3dc DJ |
125 | x86_64_fill_gregset, x86_64_store_gregset }, |
126 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t), | |
0d62e5e8 | 127 | FP_REGS, |
58caa3dc | 128 | x86_64_fill_fpregset, x86_64_store_fpregset }, |
0d62e5e8 | 129 | { 0, 0, -1, -1, NULL, NULL } |
58caa3dc | 130 | }; |
2ec06d2e | 131 | |
011a70c2 DJ |
132 | static const unsigned char x86_64_breakpoint[] = { 0xCC }; |
133 | #define x86_64_breakpoint_len 1 | |
134 | ||
135 | extern int debug_threads; | |
136 | ||
137 | static CORE_ADDR | |
138 | x86_64_get_pc () | |
139 | { | |
140 | unsigned long pc; | |
141 | ||
142 | collect_register_by_name ("rip", &pc); | |
143 | ||
144 | if (debug_threads) | |
145 | fprintf (stderr, "stop pc (before any decrement) is %08lx\n", pc); | |
146 | return pc; | |
147 | } | |
148 | ||
149 | static void | |
150 | x86_64_set_pc (CORE_ADDR newpc) | |
151 | { | |
152 | if (debug_threads) | |
153 | fprintf (stderr, "set pc to %08lx\n", (long) newpc); | |
154 | supply_register_by_name ("rip", &newpc); | |
155 | } | |
156 | ||
157 | static int | |
158 | x86_64_breakpoint_at (CORE_ADDR pc) | |
159 | { | |
160 | unsigned char c; | |
161 | ||
162 | read_inferior_memory (pc, &c, 1); | |
163 | if (c == 0xCC) | |
164 | return 1; | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
2ec06d2e DJ |
169 | struct linux_target_ops the_low_target = { |
170 | -1, | |
171 | NULL, | |
172 | NULL, | |
173 | NULL, | |
011a70c2 DJ |
174 | x86_64_get_pc, |
175 | x86_64_set_pc, | |
176 | x86_64_breakpoint, | |
177 | x86_64_breakpoint_len, | |
178 | NULL, | |
179 | 1, | |
180 | x86_64_breakpoint_at, | |
2ec06d2e | 181 | }; |