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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]; | |
111217b3 | 122 | const int l0_regno = find_regno ("l0"); |
dfb64f85 DJ |
123 | const int i7_regno = l0_regno + 15; |
124 | ||
125 | /* These registers have to be stored in the stack. */ | |
111217b3 PA |
126 | memcpy (&addr, |
127 | ((char *) buf) + sparc_regmap[find_regno ("sp")], | |
128 | sizeof (addr)); | |
dfb64f85 DJ |
129 | |
130 | addr += BIAS; | |
1b3f6016 | 131 | |
dfb64f85 DJ |
132 | for (i = l0_regno; i <= i7_regno; i++) |
133 | { | |
442ea881 | 134 | collect_register (regcache, i, tmp_reg_buf); |
111217b3 PA |
135 | (*the_target->write_memory) (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
136 | addr += sizeof (tmp_reg_buf); | |
dfb64f85 DJ |
137 | } |
138 | } | |
139 | ||
140 | static void | |
442ea881 | 141 | sparc_fill_gregset (struct regcache *regcache, void *buf) |
dfb64f85 DJ |
142 | { |
143 | int i; | |
144 | int range; | |
1b3f6016 | 145 | |
dfb64f85 | 146 | for (range = 0; range < N_GREGS_RANGES; range++) |
493e2a69 MS |
147 | for (i = gregs_ranges[range].regno_start; |
148 | i <= gregs_ranges[range].regno_end; i++) | |
dfb64f85 | 149 | if (sparc_regmap[i] != -1) |
442ea881 | 150 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
1b3f6016 | 151 | |
442ea881 | 152 | sparc_fill_gregset_to_stack (regcache, buf); |
dfb64f85 DJ |
153 | } |
154 | ||
155 | static void | |
442ea881 | 156 | sparc_fill_fpregset (struct regcache *regcache, void *buf) |
dfb64f85 DJ |
157 | { |
158 | int i; | |
159 | int range; | |
1b3f6016 | 160 | |
dfb64f85 | 161 | for (range = 0; range < N_FPREGS_RANGES; range++) |
493e2a69 MS |
162 | for (i = fpregs_ranges[range].regno_start; |
163 | i <= fpregs_ranges[range].regno_end; i++) | |
442ea881 | 164 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
1b3f6016 | 165 | |
dfb64f85 DJ |
166 | } |
167 | ||
168 | static void | |
442ea881 | 169 | sparc_store_gregset_from_stack (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
170 | { |
171 | int i; | |
172 | CORE_ADDR addr = 0; | |
173 | unsigned char tmp_reg_buf[8]; | |
111217b3 | 174 | const int l0_regno = find_regno ("l0"); |
dfb64f85 DJ |
175 | const int i7_regno = l0_regno + 15; |
176 | ||
177 | /* These registers have to be obtained from the stack. */ | |
111217b3 PA |
178 | memcpy (&addr, |
179 | ((char *) buf) + sparc_regmap[find_regno ("sp")], | |
180 | sizeof (addr)); | |
dfb64f85 DJ |
181 | |
182 | addr += BIAS; | |
1b3f6016 | 183 | |
dfb64f85 DJ |
184 | for (i = l0_regno; i <= i7_regno; i++) |
185 | { | |
111217b3 | 186 | (*the_target->read_memory) (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
442ea881 | 187 | supply_register (regcache, i, tmp_reg_buf); |
111217b3 | 188 | addr += sizeof (tmp_reg_buf); |
dfb64f85 DJ |
189 | } |
190 | } | |
191 | ||
192 | static void | |
442ea881 | 193 | sparc_store_gregset (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
194 | { |
195 | int i; | |
196 | char zerobuf[8]; | |
197 | int range; | |
198 | ||
111217b3 | 199 | memset (zerobuf, 0, sizeof (zerobuf)); |
1b3f6016 | 200 | |
dfb64f85 | 201 | for (range = 0; range < N_GREGS_RANGES; range++) |
493e2a69 MS |
202 | for (i = gregs_ranges[range].regno_start; |
203 | i <= gregs_ranges[range].regno_end; i++) | |
dfb64f85 | 204 | if (sparc_regmap[i] != -1) |
442ea881 | 205 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
dfb64f85 | 206 | else |
442ea881 | 207 | supply_register (regcache, i, zerobuf); |
1b3f6016 | 208 | |
442ea881 | 209 | sparc_store_gregset_from_stack (regcache, buf); |
dfb64f85 DJ |
210 | } |
211 | ||
212 | static void | |
442ea881 | 213 | sparc_store_fpregset (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
214 | { |
215 | int i; | |
216 | int range; | |
1b3f6016 | 217 | |
dfb64f85 | 218 | for (range = 0; range < N_FPREGS_RANGES; range++) |
442ea881 PA |
219 | for (i = fpregs_ranges[range].regno_start; |
220 | i <= fpregs_ranges[range].regno_end; | |
221 | i++) | |
222 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); | |
dfb64f85 DJ |
223 | } |
224 | ||
225 | extern int debug_threads; | |
226 | ||
227 | static CORE_ADDR | |
442ea881 | 228 | sparc_get_pc (struct regcache *regcache) |
dfb64f85 | 229 | { |
442ea881 PA |
230 | unsigned long pc; |
231 | collect_register_by_name (regcache, "pc", &pc); | |
dfb64f85 DJ |
232 | if (debug_threads) |
233 | fprintf (stderr, "stop pc is %08lx\n", pc); | |
234 | return pc; | |
235 | } | |
236 | ||
493e2a69 MS |
237 | static const unsigned char sparc_breakpoint[INSN_SIZE] = { |
238 | 0x91, 0xd0, 0x20, 0x01 | |
239 | }; | |
dfb64f85 DJ |
240 | #define sparc_breakpoint_len INSN_SIZE |
241 | ||
242 | ||
243 | static int | |
244 | sparc_breakpoint_at (CORE_ADDR where) | |
245 | { | |
246 | unsigned char insn[INSN_SIZE]; | |
247 | ||
111217b3 | 248 | (*the_target->read_memory) (where, (unsigned char *) insn, sizeof (insn)); |
1b3f6016 | 249 | |
111217b3 | 250 | if (memcmp (sparc_breakpoint, insn, sizeof (insn)) == 0) |
dfb64f85 DJ |
251 | return 1; |
252 | ||
493e2a69 MS |
253 | /* If necessary, recognize more trap instructions here. GDB only |
254 | uses TRAP Always. */ | |
dfb64f85 DJ |
255 | |
256 | return 0; | |
257 | } | |
258 | ||
259 | /* We only place breakpoints in empty marker functions, and thread locking | |
260 | is outside of the function. So rather than importing software single-step, | |
261 | we can just run until exit. */ | |
262 | static CORE_ADDR | |
442ea881 | 263 | sparc_reinsert_addr (void) |
dfb64f85 | 264 | { |
442ea881 | 265 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
dfb64f85 DJ |
266 | CORE_ADDR lr; |
267 | /* O7 is the equivalent to the 'lr' of other archs. */ | |
442ea881 | 268 | collect_register_by_name (regcache, "o7", &lr); |
dfb64f85 DJ |
269 | return lr; |
270 | } | |
271 | ||
272 | ||
273 | struct regset_info target_regsets[] = { | |
1570b33e | 274 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
dfb64f85 DJ |
275 | GENERAL_REGS, |
276 | sparc_fill_gregset, sparc_store_gregset }, | |
1570b33e | 277 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t), |
dfb64f85 DJ |
278 | FP_REGS, |
279 | sparc_fill_fpregset, sparc_store_fpregset }, | |
1570b33e | 280 | { 0, 0, 0, -1, -1, NULL, NULL } |
dfb64f85 DJ |
281 | }; |
282 | ||
283 | struct linux_target_ops the_low_target = { | |
284 | init_registers_sparc64, | |
285 | sparc_num_regs, | |
286 | /* No regmap needs to be provided since this impl. doesn't use USRREGS. */ | |
287 | NULL, | |
1faeff08 | 288 | NULL, |
dfb64f85 DJ |
289 | sparc_cannot_fetch_register, |
290 | sparc_cannot_store_register, | |
c14dfd32 | 291 | NULL, /* fetch_register */ |
dfb64f85 DJ |
292 | sparc_get_pc, |
293 | /* No sparc_set_pc is needed. */ | |
294 | NULL, | |
295 | (const unsigned char *) sparc_breakpoint, | |
296 | sparc_breakpoint_len, | |
297 | sparc_reinsert_addr, | |
298 | 0, | |
299 | sparc_breakpoint_at, | |
300 | NULL, NULL, NULL, NULL, | |
301 | NULL, NULL | |
302 | }; |