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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. */ | |
d7146cda TBA |
68 | |
69 | bool low_breakpoint_at (CORE_ADDR pc) override; | |
ef0478f6 TBA |
70 | }; |
71 | ||
72 | /* The singleton target ops object. */ | |
73 | ||
74 | static sparc_target the_sparc_target; | |
75 | ||
bf9ae9d8 TBA |
76 | bool |
77 | sparc_target::low_supports_breakpoints () | |
78 | { | |
79 | return true; | |
80 | } | |
81 | ||
82 | CORE_ADDR | |
83 | sparc_target::low_get_pc (regcache *regcache) | |
84 | { | |
85 | return linux_get_pc_64bit (regcache); | |
86 | } | |
87 | ||
dfb64f85 DJ |
88 | /* Each offset is multiplied by 8, because of the register size. |
89 | These offsets apply to the buffer sent/filled by ptrace. | |
90 | Additionally, the array elements order corresponds to the .dat file, and the | |
91 | gdb's registers enumeration order. */ | |
92 | ||
93 | static int sparc_regmap[] = { | |
94 | /* These offsets correspond to GET/SETREGSET. */ | |
493e2a69 MS |
95 | -1, 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, /* g0 .. g7 */ |
96 | 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, /* o0 .. o5, sp, o7 */ | |
97 | -1, -1, -1, -1, -1, -1, -1, -1, /* l0 .. l7 */ | |
98 | -1, -1, -1, -1, -1, -1, -1, -1, /* i0 .. i5, fp, i7 */ | |
dfb64f85 DJ |
99 | |
100 | /* Floating point registers offsets correspond to GET/SETFPREGSET. */ | |
101 | 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4, /* f0 .. f7 */ | |
102 | 8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4, /* f8 .. f15 */ | |
103 | 16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4, /* f16 .. f23 */ | |
104 | 24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4, /* f24 .. f31 */ | |
105 | ||
106 | /* F32 offset starts next to f31: 31*4+4 = 16 * 8. */ | |
1b3f6016 PA |
107 | 16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8, /* f32 .. f46 */ |
108 | 24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8, /* f48 .. f62 */ | |
dfb64f85 DJ |
109 | |
110 | 17 *8, /* pc */ | |
111 | 18 *8, /* npc */ | |
112 | 16 *8, /* state */ | |
493e2a69 MS |
113 | /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed |
114 | next to f62. */ | |
dfb64f85 DJ |
115 | 32 *8, /* fsr */ |
116 | -1, /* fprs */ | |
117 | /* Y register is 32-bits length, but gdb takes care of that. */ | |
118 | 19 *8, /* y */ | |
119 | ||
120 | }; | |
121 | ||
122 | ||
123 | struct regs_range_t | |
124 | { | |
125 | int regno_start; | |
126 | int regno_end; | |
127 | }; | |
128 | ||
129 | static const struct regs_range_t gregs_ranges[] = { | |
130 | { 0, 31 }, /* g0 .. i7 */ | |
131 | { 80, 82 }, /* pc .. state */ | |
132 | { 84, 85 } /* fprs .. y */ | |
133 | }; | |
134 | ||
135 | #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t)) | |
136 | ||
137 | static const struct regs_range_t fpregs_ranges[] = { | |
138 | { 32, 79 }, /* f0 .. f62 */ | |
139 | { 83, 83 } /* fsr */ | |
140 | }; | |
141 | ||
142 | #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t)) | |
143 | ||
144 | /* Defined in auto-generated file reg-sparc64.c. */ | |
145 | void init_registers_sparc64 (void); | |
3aee8918 | 146 | extern const struct target_desc *tdesc_sparc64; |
dfb64f85 | 147 | |
daca57a7 TBA |
148 | bool |
149 | sparc_target::low_cannot_store_register (int regno) | |
dfb64f85 DJ |
150 | { |
151 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); | |
152 | } | |
153 | ||
daca57a7 TBA |
154 | bool |
155 | sparc_target::low_cannot_fetch_register (int regno) | |
dfb64f85 DJ |
156 | { |
157 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); | |
158 | } | |
159 | ||
160 | static void | |
442ea881 | 161 | sparc_fill_gregset_to_stack (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
162 | { |
163 | int i; | |
164 | CORE_ADDR addr = 0; | |
165 | unsigned char tmp_reg_buf[8]; | |
3aee8918 | 166 | const int l0_regno = find_regno (regcache->tdesc, "l0"); |
dfb64f85 DJ |
167 | const int i7_regno = l0_regno + 15; |
168 | ||
169 | /* These registers have to be stored in the stack. */ | |
111217b3 | 170 | memcpy (&addr, |
3aee8918 | 171 | ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")], |
111217b3 | 172 | sizeof (addr)); |
dfb64f85 DJ |
173 | |
174 | addr += BIAS; | |
1b3f6016 | 175 | |
dfb64f85 DJ |
176 | for (i = l0_regno; i <= i7_regno; i++) |
177 | { | |
442ea881 | 178 | collect_register (regcache, i, tmp_reg_buf); |
52405d85 | 179 | the_target->write_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
111217b3 | 180 | addr += sizeof (tmp_reg_buf); |
dfb64f85 DJ |
181 | } |
182 | } | |
183 | ||
184 | static void | |
442ea881 | 185 | sparc_fill_gregset (struct regcache *regcache, void *buf) |
dfb64f85 DJ |
186 | { |
187 | int i; | |
188 | int range; | |
1b3f6016 | 189 | |
dfb64f85 | 190 | for (range = 0; range < N_GREGS_RANGES; range++) |
493e2a69 MS |
191 | for (i = gregs_ranges[range].regno_start; |
192 | i <= gregs_ranges[range].regno_end; i++) | |
dfb64f85 | 193 | if (sparc_regmap[i] != -1) |
442ea881 | 194 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
1b3f6016 | 195 | |
442ea881 | 196 | sparc_fill_gregset_to_stack (regcache, buf); |
dfb64f85 DJ |
197 | } |
198 | ||
199 | static void | |
442ea881 | 200 | sparc_fill_fpregset (struct regcache *regcache, void *buf) |
dfb64f85 DJ |
201 | { |
202 | int i; | |
203 | int range; | |
1b3f6016 | 204 | |
dfb64f85 | 205 | for (range = 0; range < N_FPREGS_RANGES; range++) |
493e2a69 MS |
206 | for (i = fpregs_ranges[range].regno_start; |
207 | i <= fpregs_ranges[range].regno_end; i++) | |
442ea881 | 208 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
1b3f6016 | 209 | |
dfb64f85 DJ |
210 | } |
211 | ||
212 | static void | |
442ea881 | 213 | sparc_store_gregset_from_stack (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
214 | { |
215 | int i; | |
216 | CORE_ADDR addr = 0; | |
217 | unsigned char tmp_reg_buf[8]; | |
3aee8918 | 218 | const int l0_regno = find_regno (regcache->tdesc, "l0"); |
dfb64f85 DJ |
219 | const int i7_regno = l0_regno + 15; |
220 | ||
221 | /* These registers have to be obtained from the stack. */ | |
111217b3 | 222 | memcpy (&addr, |
3aee8918 | 223 | ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")], |
111217b3 | 224 | sizeof (addr)); |
dfb64f85 DJ |
225 | |
226 | addr += BIAS; | |
1b3f6016 | 227 | |
dfb64f85 DJ |
228 | for (i = l0_regno; i <= i7_regno; i++) |
229 | { | |
52405d85 | 230 | the_target->read_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
442ea881 | 231 | supply_register (regcache, i, tmp_reg_buf); |
111217b3 | 232 | addr += sizeof (tmp_reg_buf); |
dfb64f85 DJ |
233 | } |
234 | } | |
235 | ||
236 | static void | |
442ea881 | 237 | sparc_store_gregset (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
238 | { |
239 | int i; | |
240 | char zerobuf[8]; | |
241 | int range; | |
242 | ||
111217b3 | 243 | memset (zerobuf, 0, sizeof (zerobuf)); |
1b3f6016 | 244 | |
dfb64f85 | 245 | for (range = 0; range < N_GREGS_RANGES; range++) |
493e2a69 MS |
246 | for (i = gregs_ranges[range].regno_start; |
247 | i <= gregs_ranges[range].regno_end; i++) | |
dfb64f85 | 248 | if (sparc_regmap[i] != -1) |
442ea881 | 249 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
dfb64f85 | 250 | else |
442ea881 | 251 | supply_register (regcache, i, zerobuf); |
1b3f6016 | 252 | |
442ea881 | 253 | sparc_store_gregset_from_stack (regcache, buf); |
dfb64f85 DJ |
254 | } |
255 | ||
256 | static void | |
442ea881 | 257 | sparc_store_fpregset (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
258 | { |
259 | int i; | |
260 | int range; | |
1b3f6016 | 261 | |
dfb64f85 | 262 | for (range = 0; range < N_FPREGS_RANGES; range++) |
442ea881 PA |
263 | for (i = fpregs_ranges[range].regno_start; |
264 | i <= fpregs_ranges[range].regno_end; | |
265 | i++) | |
266 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); | |
dfb64f85 DJ |
267 | } |
268 | ||
dd373349 | 269 | static const gdb_byte sparc_breakpoint[INSN_SIZE] = { |
493e2a69 MS |
270 | 0x91, 0xd0, 0x20, 0x01 |
271 | }; | |
dfb64f85 DJ |
272 | #define sparc_breakpoint_len INSN_SIZE |
273 | ||
3ca4edb6 | 274 | /* Implementation of target ops method "sw_breakpoint_from_kind". */ |
dd373349 | 275 | |
3ca4edb6 TBA |
276 | const gdb_byte * |
277 | sparc_target::sw_breakpoint_from_kind (int kind, int *size) | |
dd373349 AT |
278 | { |
279 | *size = sparc_breakpoint_len; | |
280 | return sparc_breakpoint; | |
281 | } | |
dfb64f85 | 282 | |
d7146cda TBA |
283 | bool |
284 | sparc_target::low_breakpoint_at (CORE_ADDR where) | |
dfb64f85 DJ |
285 | { |
286 | unsigned char insn[INSN_SIZE]; | |
287 | ||
d7146cda | 288 | read_memory (where, (unsigned char *) insn, sizeof (insn)); |
1b3f6016 | 289 | |
111217b3 | 290 | if (memcmp (sparc_breakpoint, insn, sizeof (insn)) == 0) |
d7146cda | 291 | return true; |
dfb64f85 | 292 | |
493e2a69 MS |
293 | /* If necessary, recognize more trap instructions here. GDB only |
294 | uses TRAP Always. */ | |
dfb64f85 | 295 | |
d7146cda | 296 | return false; |
dfb64f85 DJ |
297 | } |
298 | ||
797bcff5 TBA |
299 | void |
300 | sparc_target::low_arch_setup () | |
3aee8918 PA |
301 | { |
302 | current_process ()->tdesc = tdesc_sparc64; | |
303 | } | |
dfb64f85 | 304 | |
3aee8918 | 305 | static struct regset_info sparc_regsets[] = { |
1570b33e | 306 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
dfb64f85 DJ |
307 | GENERAL_REGS, |
308 | sparc_fill_gregset, sparc_store_gregset }, | |
1570b33e | 309 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t), |
dfb64f85 DJ |
310 | FP_REGS, |
311 | sparc_fill_fpregset, sparc_store_fpregset }, | |
50bc912a | 312 | NULL_REGSET |
dfb64f85 DJ |
313 | }; |
314 | ||
3aee8918 PA |
315 | static struct regsets_info sparc_regsets_info = |
316 | { | |
317 | sparc_regsets, /* regsets */ | |
318 | 0, /* num_regsets */ | |
319 | NULL, /* disabled_regsets */ | |
320 | }; | |
321 | ||
322 | static struct usrregs_info sparc_usrregs_info = | |
323 | { | |
324 | sparc_num_regs, | |
325 | /* No regmap needs to be provided since this impl. doesn't use | |
326 | USRREGS. */ | |
327 | NULL | |
328 | }; | |
329 | ||
aa8d21c9 | 330 | static struct regs_info myregs_info = |
3aee8918 PA |
331 | { |
332 | NULL, /* regset_bitmap */ | |
333 | &sparc_usrregs_info, | |
334 | &sparc_regsets_info | |
335 | }; | |
336 | ||
aa8d21c9 TBA |
337 | const regs_info * |
338 | sparc_target::get_regs_info () | |
3aee8918 | 339 | { |
aa8d21c9 | 340 | return &myregs_info; |
3aee8918 PA |
341 | } |
342 | ||
ef0478f6 TBA |
343 | /* The linux target ops object. */ |
344 | ||
345 | linux_process_target *the_linux_target = &the_sparc_target; | |
346 | ||
3aee8918 PA |
347 | void |
348 | initialize_low_arch (void) | |
349 | { | |
350 | /* Initialize the Linux target descriptions. */ | |
351 | init_registers_sparc64 (); | |
352 | ||
353 | initialize_regsets_info (&sparc_regsets_info); | |
354 | } |