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dfb64f85 DJ |
1 | /* Low level interface to ptrace, for the remote server for GDB. |
2 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, | |
0fb0cc75 | 3 | 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
dfb64f85 DJ |
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 "server.h" | |
21 | #include "linux-low.h" | |
22 | ||
23 | #include <sys/ptrace.h> | |
24 | ||
25 | #include "gdb_proc_service.h" | |
26 | ||
27 | /* The stack pointer is offset from the stack frame by a BIAS of 2047 | |
28 | (0x7ff) for 64-bit code. BIAS is likely to be defined on SPARC | |
29 | hosts, so undefine it first. */ | |
30 | #undef BIAS | |
31 | #define BIAS 2047 | |
32 | ||
33 | #ifdef HAVE_SYS_REG_H | |
34 | #include <sys/reg.h> | |
35 | #endif | |
36 | ||
37 | #define INSN_SIZE 4 | |
38 | ||
39 | #define SPARC_R_REGS_NUM 32 | |
40 | #define SPARC_F_REGS_NUM 48 | |
41 | #define SPARC_CONTROL_REGS_NUM 6 | |
42 | ||
43 | #define sparc_num_regs (SPARC_R_REGS_NUM + SPARC_F_REGS_NUM + SPARC_CONTROL_REGS_NUM) | |
44 | ||
45 | /* Each offset is multiplied by 8, because of the register size. | |
46 | These offsets apply to the buffer sent/filled by ptrace. | |
47 | Additionally, the array elements order corresponds to the .dat file, and the | |
48 | gdb's registers enumeration order. */ | |
49 | ||
50 | static int sparc_regmap[] = { | |
51 | /* These offsets correspond to GET/SETREGSET. */ | |
1b3f6016 PA |
52 | -1, 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, /* g0 .. g7 */ |
53 | 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, /* o0 .. o5, sp, o7 */ | |
54 | -1, -1, -1, -1, -1, -1, -1, -1, /* l0 .. l7 */ | |
55 | -1, -1, -1, -1, -1, -1, -1, -1, /* i0 .. i5, fp, i7 */ | |
dfb64f85 DJ |
56 | |
57 | /* Floating point registers offsets correspond to GET/SETFPREGSET. */ | |
58 | 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4, /* f0 .. f7 */ | |
59 | 8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4, /* f8 .. f15 */ | |
60 | 16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4, /* f16 .. f23 */ | |
61 | 24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4, /* f24 .. f31 */ | |
62 | ||
63 | /* F32 offset starts next to f31: 31*4+4 = 16 * 8. */ | |
1b3f6016 PA |
64 | 16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8, /* f32 .. f46 */ |
65 | 24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8, /* f48 .. f62 */ | |
dfb64f85 DJ |
66 | |
67 | 17 *8, /* pc */ | |
68 | 18 *8, /* npc */ | |
69 | 16 *8, /* state */ | |
70 | /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed next to f62. */ | |
71 | 32 *8, /* fsr */ | |
72 | -1, /* fprs */ | |
73 | /* Y register is 32-bits length, but gdb takes care of that. */ | |
74 | 19 *8, /* y */ | |
75 | ||
76 | }; | |
77 | ||
78 | ||
79 | struct regs_range_t | |
80 | { | |
81 | int regno_start; | |
82 | int regno_end; | |
83 | }; | |
84 | ||
85 | static const struct regs_range_t gregs_ranges[] = { | |
86 | { 0, 31 }, /* g0 .. i7 */ | |
87 | { 80, 82 }, /* pc .. state */ | |
88 | { 84, 85 } /* fprs .. y */ | |
89 | }; | |
90 | ||
91 | #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t)) | |
92 | ||
93 | static const struct regs_range_t fpregs_ranges[] = { | |
94 | { 32, 79 }, /* f0 .. f62 */ | |
95 | { 83, 83 } /* fsr */ | |
96 | }; | |
97 | ||
98 | #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t)) | |
99 | ||
100 | /* Defined in auto-generated file reg-sparc64.c. */ | |
101 | void init_registers_sparc64 (void); | |
102 | ||
103 | static int | |
104 | sparc_cannot_store_register (int regno) | |
105 | { | |
106 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); | |
107 | } | |
108 | ||
109 | static int | |
110 | sparc_cannot_fetch_register (int regno) | |
111 | { | |
112 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); | |
113 | } | |
114 | ||
115 | static void | |
116 | sparc_fill_gregset_to_stack (const void *buf) | |
117 | { | |
118 | int i; | |
119 | CORE_ADDR addr = 0; | |
120 | unsigned char tmp_reg_buf[8]; | |
121 | const int l0_regno = find_regno("l0"); | |
122 | const int i7_regno = l0_regno + 15; | |
123 | ||
124 | /* These registers have to be stored in the stack. */ | |
125 | memcpy(&addr, ((char *) buf) + sparc_regmap[find_regno("sp")], sizeof(addr)); | |
126 | ||
127 | addr += BIAS; | |
1b3f6016 | 128 | |
dfb64f85 DJ |
129 | for (i = l0_regno; i <= i7_regno; i++) |
130 | { | |
131 | collect_register (i, tmp_reg_buf); | |
132 | (*the_target->write_memory) (addr, tmp_reg_buf, sizeof(tmp_reg_buf)); | |
133 | addr += sizeof(tmp_reg_buf); | |
134 | } | |
135 | } | |
136 | ||
137 | static void | |
138 | sparc_fill_gregset (void *buf) | |
139 | { | |
140 | int i; | |
141 | int range; | |
1b3f6016 | 142 | |
dfb64f85 DJ |
143 | for (range = 0; range < N_GREGS_RANGES; range++) |
144 | for (i = gregs_ranges[range].regno_start; i <= gregs_ranges[range].regno_end; i++) | |
145 | if (sparc_regmap[i] != -1) | |
1b3f6016 PA |
146 | collect_register (i, ((char *) buf) + sparc_regmap[i]); |
147 | ||
dfb64f85 DJ |
148 | sparc_fill_gregset_to_stack (buf); |
149 | } | |
150 | ||
151 | static void | |
152 | sparc_fill_fpregset (void *buf) | |
153 | { | |
154 | int i; | |
155 | int range; | |
1b3f6016 | 156 | |
dfb64f85 DJ |
157 | for (range = 0; range < N_FPREGS_RANGES; range++) |
158 | for (i = fpregs_ranges[range].regno_start; i <= fpregs_ranges[range].regno_end; i++) | |
159 | collect_register (i, ((char *) buf) + sparc_regmap[i]); | |
1b3f6016 | 160 | |
dfb64f85 DJ |
161 | } |
162 | ||
163 | static void | |
164 | sparc_store_gregset_from_stack (const void *buf) | |
165 | { | |
166 | int i; | |
167 | CORE_ADDR addr = 0; | |
168 | unsigned char tmp_reg_buf[8]; | |
169 | const int l0_regno = find_regno("l0"); | |
170 | const int i7_regno = l0_regno + 15; | |
171 | ||
172 | /* These registers have to be obtained from the stack. */ | |
173 | memcpy(&addr, ((char *) buf) + sparc_regmap[find_regno("sp")], sizeof(addr)); | |
174 | ||
175 | addr += BIAS; | |
1b3f6016 | 176 | |
dfb64f85 DJ |
177 | for (i = l0_regno; i <= i7_regno; i++) |
178 | { | |
179 | (*the_target->read_memory) (addr, tmp_reg_buf, sizeof(tmp_reg_buf)); | |
180 | supply_register (i, tmp_reg_buf); | |
181 | addr += sizeof(tmp_reg_buf); | |
182 | } | |
183 | } | |
184 | ||
185 | static void | |
186 | sparc_store_gregset (const void *buf) | |
187 | { | |
188 | int i; | |
189 | char zerobuf[8]; | |
190 | int range; | |
191 | ||
192 | memset (zerobuf, 0, sizeof(zerobuf)); | |
1b3f6016 | 193 | |
dfb64f85 DJ |
194 | for (range = 0; range < N_GREGS_RANGES; range++) |
195 | for (i = gregs_ranges[range].regno_start; i <= gregs_ranges[range].regno_end; i++) | |
196 | if (sparc_regmap[i] != -1) | |
1b3f6016 | 197 | supply_register (i, ((char *) buf) + sparc_regmap[i]); |
dfb64f85 | 198 | else |
1b3f6016 PA |
199 | supply_register (i, zerobuf); |
200 | ||
dfb64f85 DJ |
201 | sparc_store_gregset_from_stack (buf); |
202 | } | |
203 | ||
204 | static void | |
205 | sparc_store_fpregset (const void *buf) | |
206 | { | |
207 | int i; | |
208 | int range; | |
1b3f6016 | 209 | |
dfb64f85 DJ |
210 | for (range = 0; range < N_FPREGS_RANGES; range++) |
211 | for (i = fpregs_ranges[range].regno_start; i <= fpregs_ranges[range].regno_end; i++) | |
212 | supply_register (i, ((char *) buf) + sparc_regmap[i]); | |
213 | } | |
214 | ||
215 | extern int debug_threads; | |
216 | ||
217 | static CORE_ADDR | |
218 | sparc_get_pc () | |
219 | { | |
220 | CORE_ADDR pc; | |
221 | collect_register_by_name ("pc", &pc); | |
222 | if (debug_threads) | |
223 | fprintf (stderr, "stop pc is %08lx\n", pc); | |
224 | return pc; | |
225 | } | |
226 | ||
227 | static const unsigned char sparc_breakpoint[INSN_SIZE] = { 0x91, 0xd0, 0x20, 0x01 }; | |
228 | #define sparc_breakpoint_len INSN_SIZE | |
229 | ||
230 | ||
231 | static int | |
232 | sparc_breakpoint_at (CORE_ADDR where) | |
233 | { | |
234 | unsigned char insn[INSN_SIZE]; | |
235 | ||
236 | (*the_target->read_memory) (where, (unsigned char *) insn, sizeof(insn)); | |
1b3f6016 | 237 | |
dfb64f85 DJ |
238 | if (memcmp(sparc_breakpoint, insn, sizeof(insn)) == 0) |
239 | return 1; | |
240 | ||
241 | /* If necessary, recognize more trap instructions here. GDB only uses TRAP Always. */ | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
246 | /* We only place breakpoints in empty marker functions, and thread locking | |
247 | is outside of the function. So rather than importing software single-step, | |
248 | we can just run until exit. */ | |
249 | static CORE_ADDR | |
250 | sparc_reinsert_addr () | |
251 | { | |
252 | CORE_ADDR lr; | |
253 | /* O7 is the equivalent to the 'lr' of other archs. */ | |
254 | collect_register_by_name ("o7", &lr); | |
255 | return lr; | |
256 | } | |
257 | ||
258 | ||
259 | struct regset_info target_regsets[] = { | |
260 | { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t), | |
261 | GENERAL_REGS, | |
262 | sparc_fill_gregset, sparc_store_gregset }, | |
263 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (fpregset_t), | |
264 | FP_REGS, | |
265 | sparc_fill_fpregset, sparc_store_fpregset }, | |
266 | { 0, 0, -1, -1, NULL, NULL } | |
267 | }; | |
268 | ||
269 | struct linux_target_ops the_low_target = { | |
270 | init_registers_sparc64, | |
271 | sparc_num_regs, | |
272 | /* No regmap needs to be provided since this impl. doesn't use USRREGS. */ | |
273 | NULL, | |
274 | sparc_cannot_fetch_register, | |
275 | sparc_cannot_store_register, | |
276 | sparc_get_pc, | |
277 | /* No sparc_set_pc is needed. */ | |
278 | NULL, | |
279 | (const unsigned char *) sparc_breakpoint, | |
280 | sparc_breakpoint_len, | |
281 | sparc_reinsert_addr, | |
282 | 0, | |
283 | sparc_breakpoint_at, | |
284 | NULL, NULL, NULL, NULL, | |
285 | NULL, NULL | |
286 | }; |