1/* GNU/FreeBSD/amd64 specific low level interface, for the remote server for GDB.
2 Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
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 2 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, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
21
22#include <sys/cdefs.h>
23__FBSDID("$FreeBSD: stable/9/gnu/usr.bin/gdb/gdbserver/fbsd-amd64-low.c 204335 2010-02-25 21:29:00Z jkim $");
24
25#include "server.h"
26#include "fbsd-low.h"
27#include "i387-fp.h"
28
29#include <sys/stddef.h>
30#include <sys/types.h>
31#include <sys/ptrace.h>
32#include <machine/reg.h>
33
34/* Mapping between the general-purpose registers in `struct user'
35 format and GDB's register array layout. */
36static int amd64_regmap[] = {
37 offsetof(struct reg, r_rax),
38 offsetof(struct reg, r_rbx),
39 offsetof(struct reg, r_rcx),
40 offsetof(struct reg, r_rdx),
41 offsetof(struct reg, r_rsi),
42 offsetof(struct reg, r_rdi),
43 offsetof(struct reg, r_rbp),
44 offsetof(struct reg, r_rsp),
45 offsetof(struct reg, r_r8),
46 offsetof(struct reg, r_r9),
47 offsetof(struct reg, r_r10),
48 offsetof(struct reg, r_r11),
49 offsetof(struct reg, r_r12),
50 offsetof(struct reg, r_r13),
51 offsetof(struct reg, r_r14),
52 offsetof(struct reg, r_r15),
53 offsetof(struct reg, r_rip),
54 offsetof(struct reg, r_rflags), /* XXX 64-bit */
55 offsetof(struct reg, r_cs),
56 offsetof(struct reg, r_ss),
57 offsetof(struct reg, r_ds),
58 offsetof(struct reg, r_es),
59 offsetof(struct reg, r_fs),
60 offsetof(struct reg, r_gs),
61};
62#define AMD64_NUM_REGS (sizeof(amd64_regmap) / sizeof(amd64_regmap[0]))
63
64static const char amd64_breakpoint[] = { 0xCC };
65#define AMD64_BP_LEN 1
66
67extern int debug_threads;
68
69static int
70amd64_cannot_store_register(int regno)
71{
72
73 return (regno >= AMD64_NUM_REGS);
74}
75
76static int
77amd64_cannot_fetch_register(int regno)
78{
79
80 return (regno >= AMD64_NUM_REGS);
81}
82
83static void
84amd64_fill_gregset(void *buf)
85{
86 int i;
87
88 for (i = 0; i < AMD64_NUM_REGS; i++)
89 collect_register(i, ((char *)buf) + amd64_regmap[i]);
90}
91
92static void
93amd64_store_gregset(const void *buf)
94{
95 int i;
96
97 for (i = 0; i < AMD64_NUM_REGS; i++)
98 supply_register(i, ((char *)buf) + amd64_regmap[i]);
99}
100
101static void
102amd64_fill_fpregset(void *buf)
103{
104
105 i387_cache_to_fsave(buf);
106}
107
108static void
109amd64_store_fpregset(const void *buf)
110{
111
112 i387_fsave_to_cache(buf);
113}
114
115static void
116amd64_fill_fpxregset(void *buf)
117{
118
119 i387_cache_to_fxsave(buf);
120}
121
122static void
123amd64_store_fpxregset(const void *buf)
124{
125
126 i387_fxsave_to_cache(buf);
127}
128
129
130struct regset_info target_regsets[] = {
131 {
132 PT_GETREGS,
133 PT_SETREGS,
134 sizeof(struct reg),
135 GENERAL_REGS,
136 amd64_fill_gregset,
137 amd64_store_gregset,
138 },
139#ifdef HAVE_PTRACE_GETFPXREGS
140 {
141 PTRACE_GETFPXREGS,
142 PTRACE_SETFPXREGS,
143 sizeof(elf_fpxregset_t),
144 EXTENDED_REGS,
145 amd64_fill_fpxregset,
146 amd64_store_fpxregset,
147 },
148#endif
149 {
150 PT_GETFPREGS,
151 PT_SETFPREGS,
152 sizeof(struct fpreg),
153 FP_REGS,
154 amd64_fill_fpregset,
155 amd64_store_fpregset,
156 },
157 {
158 0,
159 0,
160 -1,
161 -1,
162 NULL,
163 NULL,
164 }
165};
166
167static CORE_ADDR
168amd64_get_pc(void)
169{
170 unsigned long pc;
171
172 collect_register_by_name("rip", &pc);
173
174 if (debug_threads)
175 fprintf(stderr, "stop pc (before any decrement) is %016lx\n", pc);
176
177 return (pc);
178}
179
180static void
181amd64_set_pc(CORE_ADDR newpc)
182{
183
184 if (debug_threads)
185 fprintf(stderr, "set pc to %016lx\n", (long)newpc);
186 supply_register_by_name("rip", &newpc);
187}
188
189static int
190amd64_breakpoint_at(CORE_ADDR pc)
191{
192 unsigned char c;
193
194 read_inferior_memory(pc, &c, 1);
195 if (c == 0xCC)
196 return (1);
197
198 return (0);
199}
200
201struct fbsd_target_ops the_low_target = {
202 AMD64_NUM_REGS,
203 amd64_regmap,
204 amd64_cannot_fetch_register,
205 amd64_cannot_store_register,
206 amd64_get_pc,
207 amd64_set_pc,
208 amd64_breakpoint,
209 AMD64_BP_LEN,
210 NULL,
211 1,
212 amd64_breakpoint_at,
213};