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dfb64f85 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
b811d2c2 | 2 | Copyright (C) 1995-2020 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 | ||
5826e159 | 22 | #include "nat/gdb_ptrace.h" |
dfb64f85 DJ |
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 | 44 | |
ef0478f6 TBA |
45 | /* Linux target op definitions for the SPARC architecture. */ |
46 | ||
47 | class sparc_target : public linux_process_target | |
48 | { | |
49 | public: | |
50 | ||
aa8d21c9 TBA |
51 | const regs_info *get_regs_info () override; |
52 | ||
3ca4edb6 TBA |
53 | const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override; |
54 | ||
797bcff5 TBA |
55 | protected: |
56 | ||
57 | void low_arch_setup () override; | |
daca57a7 TBA |
58 | |
59 | bool low_cannot_fetch_register (int regno) override; | |
60 | ||
61 | bool low_cannot_store_register (int regno) override; | |
bf9ae9d8 TBA |
62 | |
63 | bool low_supports_breakpoints () override; | |
64 | ||
65 | CORE_ADDR low_get_pc (regcache *regcache) override; | |
66 | ||
67 | /* No low_set_pc is needed. */ | |
ef0478f6 TBA |
68 | }; |
69 | ||
70 | /* The singleton target ops object. */ | |
71 | ||
72 | static sparc_target the_sparc_target; | |
73 | ||
bf9ae9d8 TBA |
74 | bool |
75 | sparc_target::low_supports_breakpoints () | |
76 | { | |
77 | return true; | |
78 | } | |
79 | ||
80 | CORE_ADDR | |
81 | sparc_target::low_get_pc (regcache *regcache) | |
82 | { | |
83 | return linux_get_pc_64bit (regcache); | |
84 | } | |
85 | ||
dfb64f85 DJ |
86 | /* Each offset is multiplied by 8, because of the register size. |
87 | These offsets apply to the buffer sent/filled by ptrace. | |
88 | Additionally, the array elements order corresponds to the .dat file, and the | |
89 | gdb's registers enumeration order. */ | |
90 | ||
91 | static int sparc_regmap[] = { | |
92 | /* These offsets correspond to GET/SETREGSET. */ | |
493e2a69 MS |
93 | -1, 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, /* g0 .. g7 */ |
94 | 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, /* o0 .. o5, sp, o7 */ | |
95 | -1, -1, -1, -1, -1, -1, -1, -1, /* l0 .. l7 */ | |
96 | -1, -1, -1, -1, -1, -1, -1, -1, /* i0 .. i5, fp, i7 */ | |
dfb64f85 DJ |
97 | |
98 | /* Floating point registers offsets correspond to GET/SETFPREGSET. */ | |
99 | 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4, /* f0 .. f7 */ | |
100 | 8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4, /* f8 .. f15 */ | |
101 | 16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4, /* f16 .. f23 */ | |
102 | 24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4, /* f24 .. f31 */ | |
103 | ||
104 | /* F32 offset starts next to f31: 31*4+4 = 16 * 8. */ | |
1b3f6016 PA |
105 | 16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8, /* f32 .. f46 */ |
106 | 24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8, /* f48 .. f62 */ | |
dfb64f85 DJ |
107 | |
108 | 17 *8, /* pc */ | |
109 | 18 *8, /* npc */ | |
110 | 16 *8, /* state */ | |
493e2a69 MS |
111 | /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed |
112 | next to f62. */ | |
dfb64f85 DJ |
113 | 32 *8, /* fsr */ |
114 | -1, /* fprs */ | |
115 | /* Y register is 32-bits length, but gdb takes care of that. */ | |
116 | 19 *8, /* y */ | |
117 | ||
118 | }; | |
119 | ||
120 | ||
121 | struct regs_range_t | |
122 | { | |
123 | int regno_start; | |
124 | int regno_end; | |
125 | }; | |
126 | ||
127 | static const struct regs_range_t gregs_ranges[] = { | |
128 | { 0, 31 }, /* g0 .. i7 */ | |
129 | { 80, 82 }, /* pc .. state */ | |
130 | { 84, 85 } /* fprs .. y */ | |
131 | }; | |
132 | ||
133 | #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t)) | |
134 | ||
135 | static const struct regs_range_t fpregs_ranges[] = { | |
136 | { 32, 79 }, /* f0 .. f62 */ | |
137 | { 83, 83 } /* fsr */ | |
138 | }; | |
139 | ||
140 | #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t)) | |
141 | ||
142 | /* Defined in auto-generated file reg-sparc64.c. */ | |
143 | void init_registers_sparc64 (void); | |
3aee8918 | 144 | extern const struct target_desc *tdesc_sparc64; |
dfb64f85 | 145 | |
daca57a7 TBA |
146 | bool |
147 | sparc_target::low_cannot_store_register (int regno) | |
dfb64f85 DJ |
148 | { |
149 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); | |
150 | } | |
151 | ||
daca57a7 TBA |
152 | bool |
153 | sparc_target::low_cannot_fetch_register (int regno) | |
dfb64f85 DJ |
154 | { |
155 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); | |
156 | } | |
157 | ||
158 | static void | |
442ea881 | 159 | sparc_fill_gregset_to_stack (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
160 | { |
161 | int i; | |
162 | CORE_ADDR addr = 0; | |
163 | unsigned char tmp_reg_buf[8]; | |
3aee8918 | 164 | const int l0_regno = find_regno (regcache->tdesc, "l0"); |
dfb64f85 DJ |
165 | const int i7_regno = l0_regno + 15; |
166 | ||
167 | /* These registers have to be stored in the stack. */ | |
111217b3 | 168 | memcpy (&addr, |
3aee8918 | 169 | ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")], |
111217b3 | 170 | sizeof (addr)); |
dfb64f85 DJ |
171 | |
172 | addr += BIAS; | |
1b3f6016 | 173 | |
dfb64f85 DJ |
174 | for (i = l0_regno; i <= i7_regno; i++) |
175 | { | |
442ea881 | 176 | collect_register (regcache, i, tmp_reg_buf); |
52405d85 | 177 | the_target->write_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
111217b3 | 178 | addr += sizeof (tmp_reg_buf); |
dfb64f85 DJ |
179 | } |
180 | } | |
181 | ||
182 | static void | |
442ea881 | 183 | sparc_fill_gregset (struct regcache *regcache, void *buf) |
dfb64f85 DJ |
184 | { |
185 | int i; | |
186 | int range; | |
1b3f6016 | 187 | |
dfb64f85 | 188 | for (range = 0; range < N_GREGS_RANGES; range++) |
493e2a69 MS |
189 | for (i = gregs_ranges[range].regno_start; |
190 | i <= gregs_ranges[range].regno_end; i++) | |
dfb64f85 | 191 | if (sparc_regmap[i] != -1) |
442ea881 | 192 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
1b3f6016 | 193 | |
442ea881 | 194 | sparc_fill_gregset_to_stack (regcache, buf); |
dfb64f85 DJ |
195 | } |
196 | ||
197 | static void | |
442ea881 | 198 | sparc_fill_fpregset (struct regcache *regcache, void *buf) |
dfb64f85 DJ |
199 | { |
200 | int i; | |
201 | int range; | |
1b3f6016 | 202 | |
dfb64f85 | 203 | for (range = 0; range < N_FPREGS_RANGES; range++) |
493e2a69 MS |
204 | for (i = fpregs_ranges[range].regno_start; |
205 | i <= fpregs_ranges[range].regno_end; i++) | |
442ea881 | 206 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
1b3f6016 | 207 | |
dfb64f85 DJ |
208 | } |
209 | ||
210 | static void | |
442ea881 | 211 | sparc_store_gregset_from_stack (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
212 | { |
213 | int i; | |
214 | CORE_ADDR addr = 0; | |
215 | unsigned char tmp_reg_buf[8]; | |
3aee8918 | 216 | const int l0_regno = find_regno (regcache->tdesc, "l0"); |
dfb64f85 DJ |
217 | const int i7_regno = l0_regno + 15; |
218 | ||
219 | /* These registers have to be obtained from the stack. */ | |
111217b3 | 220 | memcpy (&addr, |
3aee8918 | 221 | ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")], |
111217b3 | 222 | sizeof (addr)); |
dfb64f85 DJ |
223 | |
224 | addr += BIAS; | |
1b3f6016 | 225 | |
dfb64f85 DJ |
226 | for (i = l0_regno; i <= i7_regno; i++) |
227 | { | |
52405d85 | 228 | the_target->read_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
442ea881 | 229 | supply_register (regcache, i, tmp_reg_buf); |
111217b3 | 230 | addr += sizeof (tmp_reg_buf); |
dfb64f85 DJ |
231 | } |
232 | } | |
233 | ||
234 | static void | |
442ea881 | 235 | sparc_store_gregset (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
236 | { |
237 | int i; | |
238 | char zerobuf[8]; | |
239 | int range; | |
240 | ||
111217b3 | 241 | memset (zerobuf, 0, sizeof (zerobuf)); |
1b3f6016 | 242 | |
dfb64f85 | 243 | for (range = 0; range < N_GREGS_RANGES; range++) |
493e2a69 MS |
244 | for (i = gregs_ranges[range].regno_start; |
245 | i <= gregs_ranges[range].regno_end; i++) | |
dfb64f85 | 246 | if (sparc_regmap[i] != -1) |
442ea881 | 247 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
dfb64f85 | 248 | else |
442ea881 | 249 | supply_register (regcache, i, zerobuf); |
1b3f6016 | 250 | |
442ea881 | 251 | sparc_store_gregset_from_stack (regcache, buf); |
dfb64f85 DJ |
252 | } |
253 | ||
254 | static void | |
442ea881 | 255 | sparc_store_fpregset (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
256 | { |
257 | int i; | |
258 | int range; | |
1b3f6016 | 259 | |
dfb64f85 | 260 | for (range = 0; range < N_FPREGS_RANGES; range++) |
442ea881 PA |
261 | for (i = fpregs_ranges[range].regno_start; |
262 | i <= fpregs_ranges[range].regno_end; | |
263 | i++) | |
264 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); | |
dfb64f85 DJ |
265 | } |
266 | ||
dd373349 | 267 | static const gdb_byte sparc_breakpoint[INSN_SIZE] = { |
493e2a69 MS |
268 | 0x91, 0xd0, 0x20, 0x01 |
269 | }; | |
dfb64f85 DJ |
270 | #define sparc_breakpoint_len INSN_SIZE |
271 | ||
3ca4edb6 | 272 | /* Implementation of target ops method "sw_breakpoint_from_kind". */ |
dd373349 | 273 | |
3ca4edb6 TBA |
274 | const gdb_byte * |
275 | sparc_target::sw_breakpoint_from_kind (int kind, int *size) | |
dd373349 AT |
276 | { |
277 | *size = sparc_breakpoint_len; | |
278 | return sparc_breakpoint; | |
279 | } | |
dfb64f85 DJ |
280 | |
281 | static int | |
282 | sparc_breakpoint_at (CORE_ADDR where) | |
283 | { | |
284 | unsigned char insn[INSN_SIZE]; | |
285 | ||
52405d85 | 286 | the_target->read_memory (where, (unsigned char *) insn, sizeof (insn)); |
1b3f6016 | 287 | |
111217b3 | 288 | if (memcmp (sparc_breakpoint, insn, sizeof (insn)) == 0) |
dfb64f85 DJ |
289 | return 1; |
290 | ||
493e2a69 MS |
291 | /* If necessary, recognize more trap instructions here. GDB only |
292 | uses TRAP Always. */ | |
dfb64f85 DJ |
293 | |
294 | return 0; | |
295 | } | |
296 | ||
797bcff5 TBA |
297 | void |
298 | sparc_target::low_arch_setup () | |
3aee8918 PA |
299 | { |
300 | current_process ()->tdesc = tdesc_sparc64; | |
301 | } | |
dfb64f85 | 302 | |
3aee8918 | 303 | static struct regset_info sparc_regsets[] = { |
1570b33e | 304 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
dfb64f85 DJ |
305 | GENERAL_REGS, |
306 | sparc_fill_gregset, sparc_store_gregset }, | |
1570b33e | 307 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t), |
dfb64f85 DJ |
308 | FP_REGS, |
309 | sparc_fill_fpregset, sparc_store_fpregset }, | |
50bc912a | 310 | NULL_REGSET |
dfb64f85 DJ |
311 | }; |
312 | ||
3aee8918 PA |
313 | static struct regsets_info sparc_regsets_info = |
314 | { | |
315 | sparc_regsets, /* regsets */ | |
316 | 0, /* num_regsets */ | |
317 | NULL, /* disabled_regsets */ | |
318 | }; | |
319 | ||
320 | static struct usrregs_info sparc_usrregs_info = | |
321 | { | |
322 | sparc_num_regs, | |
323 | /* No regmap needs to be provided since this impl. doesn't use | |
324 | USRREGS. */ | |
325 | NULL | |
326 | }; | |
327 | ||
aa8d21c9 | 328 | static struct regs_info myregs_info = |
3aee8918 PA |
329 | { |
330 | NULL, /* regset_bitmap */ | |
331 | &sparc_usrregs_info, | |
332 | &sparc_regsets_info | |
333 | }; | |
334 | ||
aa8d21c9 TBA |
335 | const regs_info * |
336 | sparc_target::get_regs_info () | |
3aee8918 | 337 | { |
aa8d21c9 | 338 | return &myregs_info; |
3aee8918 PA |
339 | } |
340 | ||
dfb64f85 | 341 | struct linux_target_ops the_low_target = { |
dfb64f85 DJ |
342 | 0, |
343 | sparc_breakpoint_at, | |
802e8e6d | 344 | NULL, /* supports_z_point_type */ |
dfb64f85 DJ |
345 | NULL, NULL, NULL, NULL, |
346 | NULL, NULL | |
347 | }; | |
3aee8918 | 348 | |
ef0478f6 TBA |
349 | /* The linux target ops object. */ |
350 | ||
351 | linux_process_target *the_linux_target = &the_sparc_target; | |
352 | ||
3aee8918 PA |
353 | void |
354 | initialize_low_arch (void) | |
355 | { | |
356 | /* Initialize the Linux target descriptions. */ | |
357 | init_registers_sparc64 (); | |
358 | ||
359 | initialize_regsets_info (&sparc_regsets_info); | |
360 | } |