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dfb64f85 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
0b302171 | 2 | Copyright (C) 1995-1996, 1998-2012 Free Software Foundation, Inc. |
dfb64f85 DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include "server.h" | |
20 | #include "linux-low.h" | |
21 | ||
22 | #include <sys/ptrace.h> | |
23 | ||
24 | #include "gdb_proc_service.h" | |
25 | ||
26 | /* The stack pointer is offset from the stack frame by a BIAS of 2047 | |
27 | (0x7ff) for 64-bit code. BIAS is likely to be defined on SPARC | |
28 | hosts, so undefine it first. */ | |
29 | #undef BIAS | |
30 | #define BIAS 2047 | |
31 | ||
32 | #ifdef HAVE_SYS_REG_H | |
33 | #include <sys/reg.h> | |
34 | #endif | |
35 | ||
36 | #define INSN_SIZE 4 | |
37 | ||
38 | #define SPARC_R_REGS_NUM 32 | |
39 | #define SPARC_F_REGS_NUM 48 | |
40 | #define SPARC_CONTROL_REGS_NUM 6 | |
41 | ||
493e2a69 MS |
42 | #define sparc_num_regs \ |
43 | (SPARC_R_REGS_NUM + SPARC_F_REGS_NUM + SPARC_CONTROL_REGS_NUM) | |
dfb64f85 DJ |
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. */ | |
493e2a69 MS |
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 */ | |
493e2a69 MS |
70 | /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed |
71 | next to f62. */ | |
dfb64f85 DJ |
72 | 32 *8, /* fsr */ |
73 | -1, /* fprs */ | |
74 | /* Y register is 32-bits length, but gdb takes care of that. */ | |
75 | 19 *8, /* y */ | |
76 | ||
77 | }; | |
78 | ||
79 | ||
80 | struct regs_range_t | |
81 | { | |
82 | int regno_start; | |
83 | int regno_end; | |
84 | }; | |
85 | ||
86 | static const struct regs_range_t gregs_ranges[] = { | |
87 | { 0, 31 }, /* g0 .. i7 */ | |
88 | { 80, 82 }, /* pc .. state */ | |
89 | { 84, 85 } /* fprs .. y */ | |
90 | }; | |
91 | ||
92 | #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t)) | |
93 | ||
94 | static const struct regs_range_t fpregs_ranges[] = { | |
95 | { 32, 79 }, /* f0 .. f62 */ | |
96 | { 83, 83 } /* fsr */ | |
97 | }; | |
98 | ||
99 | #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t)) | |
100 | ||
101 | /* Defined in auto-generated file reg-sparc64.c. */ | |
102 | void init_registers_sparc64 (void); | |
103 | ||
104 | static int | |
105 | sparc_cannot_store_register (int regno) | |
106 | { | |
107 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); | |
108 | } | |
109 | ||
110 | static int | |
111 | sparc_cannot_fetch_register (int regno) | |
112 | { | |
113 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); | |
114 | } | |
115 | ||
116 | static void | |
442ea881 | 117 | sparc_fill_gregset_to_stack (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
118 | { |
119 | int i; | |
120 | CORE_ADDR addr = 0; | |
121 | unsigned char tmp_reg_buf[8]; | |
122 | const int l0_regno = find_regno("l0"); | |
123 | const int i7_regno = l0_regno + 15; | |
124 | ||
125 | /* These registers have to be stored in the stack. */ | |
126 | memcpy(&addr, ((char *) buf) + sparc_regmap[find_regno("sp")], sizeof(addr)); | |
127 | ||
128 | addr += BIAS; | |
1b3f6016 | 129 | |
dfb64f85 DJ |
130 | for (i = l0_regno; i <= i7_regno; i++) |
131 | { | |
442ea881 | 132 | collect_register (regcache, i, tmp_reg_buf); |
dfb64f85 DJ |
133 | (*the_target->write_memory) (addr, tmp_reg_buf, sizeof(tmp_reg_buf)); |
134 | addr += sizeof(tmp_reg_buf); | |
135 | } | |
136 | } | |
137 | ||
138 | static void | |
442ea881 | 139 | sparc_fill_gregset (struct regcache *regcache, void *buf) |
dfb64f85 DJ |
140 | { |
141 | int i; | |
142 | int range; | |
1b3f6016 | 143 | |
dfb64f85 | 144 | for (range = 0; range < N_GREGS_RANGES; range++) |
493e2a69 MS |
145 | for (i = gregs_ranges[range].regno_start; |
146 | i <= gregs_ranges[range].regno_end; i++) | |
dfb64f85 | 147 | if (sparc_regmap[i] != -1) |
442ea881 | 148 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
1b3f6016 | 149 | |
442ea881 | 150 | sparc_fill_gregset_to_stack (regcache, buf); |
dfb64f85 DJ |
151 | } |
152 | ||
153 | static void | |
442ea881 | 154 | sparc_fill_fpregset (struct regcache *regcache, void *buf) |
dfb64f85 DJ |
155 | { |
156 | int i; | |
157 | int range; | |
1b3f6016 | 158 | |
dfb64f85 | 159 | for (range = 0; range < N_FPREGS_RANGES; range++) |
493e2a69 MS |
160 | for (i = fpregs_ranges[range].regno_start; |
161 | i <= fpregs_ranges[range].regno_end; i++) | |
442ea881 | 162 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
1b3f6016 | 163 | |
dfb64f85 DJ |
164 | } |
165 | ||
166 | static void | |
442ea881 | 167 | sparc_store_gregset_from_stack (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
168 | { |
169 | int i; | |
170 | CORE_ADDR addr = 0; | |
171 | unsigned char tmp_reg_buf[8]; | |
172 | const int l0_regno = find_regno("l0"); | |
173 | const int i7_regno = l0_regno + 15; | |
174 | ||
175 | /* These registers have to be obtained from the stack. */ | |
176 | memcpy(&addr, ((char *) buf) + sparc_regmap[find_regno("sp")], sizeof(addr)); | |
177 | ||
178 | addr += BIAS; | |
1b3f6016 | 179 | |
dfb64f85 DJ |
180 | for (i = l0_regno; i <= i7_regno; i++) |
181 | { | |
182 | (*the_target->read_memory) (addr, tmp_reg_buf, sizeof(tmp_reg_buf)); | |
442ea881 | 183 | supply_register (regcache, i, tmp_reg_buf); |
dfb64f85 DJ |
184 | addr += sizeof(tmp_reg_buf); |
185 | } | |
186 | } | |
187 | ||
188 | static void | |
442ea881 | 189 | sparc_store_gregset (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
190 | { |
191 | int i; | |
192 | char zerobuf[8]; | |
193 | int range; | |
194 | ||
195 | memset (zerobuf, 0, sizeof(zerobuf)); | |
1b3f6016 | 196 | |
dfb64f85 | 197 | for (range = 0; range < N_GREGS_RANGES; range++) |
493e2a69 MS |
198 | for (i = gregs_ranges[range].regno_start; |
199 | i <= gregs_ranges[range].regno_end; i++) | |
dfb64f85 | 200 | if (sparc_regmap[i] != -1) |
442ea881 | 201 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
dfb64f85 | 202 | else |
442ea881 | 203 | supply_register (regcache, i, zerobuf); |
1b3f6016 | 204 | |
442ea881 | 205 | sparc_store_gregset_from_stack (regcache, buf); |
dfb64f85 DJ |
206 | } |
207 | ||
208 | static void | |
442ea881 | 209 | sparc_store_fpregset (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
210 | { |
211 | int i; | |
212 | int range; | |
1b3f6016 | 213 | |
dfb64f85 | 214 | for (range = 0; range < N_FPREGS_RANGES; range++) |
442ea881 PA |
215 | for (i = fpregs_ranges[range].regno_start; |
216 | i <= fpregs_ranges[range].regno_end; | |
217 | i++) | |
218 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); | |
dfb64f85 DJ |
219 | } |
220 | ||
221 | extern int debug_threads; | |
222 | ||
223 | static CORE_ADDR | |
442ea881 | 224 | sparc_get_pc (struct regcache *regcache) |
dfb64f85 | 225 | { |
442ea881 PA |
226 | unsigned long pc; |
227 | collect_register_by_name (regcache, "pc", &pc); | |
dfb64f85 DJ |
228 | if (debug_threads) |
229 | fprintf (stderr, "stop pc is %08lx\n", pc); | |
230 | return pc; | |
231 | } | |
232 | ||
493e2a69 MS |
233 | static const unsigned char sparc_breakpoint[INSN_SIZE] = { |
234 | 0x91, 0xd0, 0x20, 0x01 | |
235 | }; | |
dfb64f85 DJ |
236 | #define sparc_breakpoint_len INSN_SIZE |
237 | ||
238 | ||
239 | static int | |
240 | sparc_breakpoint_at (CORE_ADDR where) | |
241 | { | |
242 | unsigned char insn[INSN_SIZE]; | |
243 | ||
244 | (*the_target->read_memory) (where, (unsigned char *) insn, sizeof(insn)); | |
1b3f6016 | 245 | |
dfb64f85 DJ |
246 | if (memcmp(sparc_breakpoint, insn, sizeof(insn)) == 0) |
247 | return 1; | |
248 | ||
493e2a69 MS |
249 | /* If necessary, recognize more trap instructions here. GDB only |
250 | uses TRAP Always. */ | |
dfb64f85 DJ |
251 | |
252 | return 0; | |
253 | } | |
254 | ||
255 | /* We only place breakpoints in empty marker functions, and thread locking | |
256 | is outside of the function. So rather than importing software single-step, | |
257 | we can just run until exit. */ | |
258 | static CORE_ADDR | |
442ea881 | 259 | sparc_reinsert_addr (void) |
dfb64f85 | 260 | { |
442ea881 | 261 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
dfb64f85 DJ |
262 | CORE_ADDR lr; |
263 | /* O7 is the equivalent to the 'lr' of other archs. */ | |
442ea881 | 264 | collect_register_by_name (regcache, "o7", &lr); |
dfb64f85 DJ |
265 | return lr; |
266 | } | |
267 | ||
268 | ||
269 | struct regset_info target_regsets[] = { | |
1570b33e | 270 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
dfb64f85 DJ |
271 | GENERAL_REGS, |
272 | sparc_fill_gregset, sparc_store_gregset }, | |
1570b33e | 273 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t), |
dfb64f85 DJ |
274 | FP_REGS, |
275 | sparc_fill_fpregset, sparc_store_fpregset }, | |
1570b33e | 276 | { 0, 0, 0, -1, -1, NULL, NULL } |
dfb64f85 DJ |
277 | }; |
278 | ||
279 | struct linux_target_ops the_low_target = { | |
280 | init_registers_sparc64, | |
281 | sparc_num_regs, | |
282 | /* No regmap needs to be provided since this impl. doesn't use USRREGS. */ | |
283 | NULL, | |
284 | sparc_cannot_fetch_register, | |
285 | sparc_cannot_store_register, | |
286 | sparc_get_pc, | |
287 | /* No sparc_set_pc is needed. */ | |
288 | NULL, | |
289 | (const unsigned char *) sparc_breakpoint, | |
290 | sparc_breakpoint_len, | |
291 | sparc_reinsert_addr, | |
292 | 0, | |
293 | sparc_breakpoint_at, | |
294 | NULL, NULL, NULL, NULL, | |
295 | NULL, NULL | |
296 | }; |