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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 | ||
51 | }; | |
52 | ||
53 | /* The singleton target ops object. */ | |
54 | ||
55 | static sparc_target the_sparc_target; | |
56 | ||
dfb64f85 DJ |
57 | /* Each offset is multiplied by 8, because of the register size. |
58 | These offsets apply to the buffer sent/filled by ptrace. | |
59 | Additionally, the array elements order corresponds to the .dat file, and the | |
60 | gdb's registers enumeration order. */ | |
61 | ||
62 | static int sparc_regmap[] = { | |
63 | /* These offsets correspond to GET/SETREGSET. */ | |
493e2a69 MS |
64 | -1, 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, /* g0 .. g7 */ |
65 | 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, /* o0 .. o5, sp, o7 */ | |
66 | -1, -1, -1, -1, -1, -1, -1, -1, /* l0 .. l7 */ | |
67 | -1, -1, -1, -1, -1, -1, -1, -1, /* i0 .. i5, fp, i7 */ | |
dfb64f85 DJ |
68 | |
69 | /* Floating point registers offsets correspond to GET/SETFPREGSET. */ | |
70 | 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4, /* f0 .. f7 */ | |
71 | 8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4, /* f8 .. f15 */ | |
72 | 16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4, /* f16 .. f23 */ | |
73 | 24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4, /* f24 .. f31 */ | |
74 | ||
75 | /* F32 offset starts next to f31: 31*4+4 = 16 * 8. */ | |
1b3f6016 PA |
76 | 16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8, /* f32 .. f46 */ |
77 | 24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8, /* f48 .. f62 */ | |
dfb64f85 DJ |
78 | |
79 | 17 *8, /* pc */ | |
80 | 18 *8, /* npc */ | |
81 | 16 *8, /* state */ | |
493e2a69 MS |
82 | /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed |
83 | next to f62. */ | |
dfb64f85 DJ |
84 | 32 *8, /* fsr */ |
85 | -1, /* fprs */ | |
86 | /* Y register is 32-bits length, but gdb takes care of that. */ | |
87 | 19 *8, /* y */ | |
88 | ||
89 | }; | |
90 | ||
91 | ||
92 | struct regs_range_t | |
93 | { | |
94 | int regno_start; | |
95 | int regno_end; | |
96 | }; | |
97 | ||
98 | static const struct regs_range_t gregs_ranges[] = { | |
99 | { 0, 31 }, /* g0 .. i7 */ | |
100 | { 80, 82 }, /* pc .. state */ | |
101 | { 84, 85 } /* fprs .. y */ | |
102 | }; | |
103 | ||
104 | #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t)) | |
105 | ||
106 | static const struct regs_range_t fpregs_ranges[] = { | |
107 | { 32, 79 }, /* f0 .. f62 */ | |
108 | { 83, 83 } /* fsr */ | |
109 | }; | |
110 | ||
111 | #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t)) | |
112 | ||
113 | /* Defined in auto-generated file reg-sparc64.c. */ | |
114 | void init_registers_sparc64 (void); | |
3aee8918 | 115 | extern const struct target_desc *tdesc_sparc64; |
dfb64f85 DJ |
116 | |
117 | static int | |
118 | sparc_cannot_store_register (int regno) | |
119 | { | |
120 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); | |
121 | } | |
122 | ||
123 | static int | |
124 | sparc_cannot_fetch_register (int regno) | |
125 | { | |
126 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); | |
127 | } | |
128 | ||
129 | static void | |
442ea881 | 130 | sparc_fill_gregset_to_stack (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
131 | { |
132 | int i; | |
133 | CORE_ADDR addr = 0; | |
134 | unsigned char tmp_reg_buf[8]; | |
3aee8918 | 135 | const int l0_regno = find_regno (regcache->tdesc, "l0"); |
dfb64f85 DJ |
136 | const int i7_regno = l0_regno + 15; |
137 | ||
138 | /* These registers have to be stored in the stack. */ | |
111217b3 | 139 | memcpy (&addr, |
3aee8918 | 140 | ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")], |
111217b3 | 141 | sizeof (addr)); |
dfb64f85 DJ |
142 | |
143 | addr += BIAS; | |
1b3f6016 | 144 | |
dfb64f85 DJ |
145 | for (i = l0_regno; i <= i7_regno; i++) |
146 | { | |
442ea881 | 147 | collect_register (regcache, i, tmp_reg_buf); |
52405d85 | 148 | the_target->write_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
111217b3 | 149 | addr += sizeof (tmp_reg_buf); |
dfb64f85 DJ |
150 | } |
151 | } | |
152 | ||
153 | static void | |
442ea881 | 154 | sparc_fill_gregset (struct regcache *regcache, void *buf) |
dfb64f85 DJ |
155 | { |
156 | int i; | |
157 | int range; | |
1b3f6016 | 158 | |
dfb64f85 | 159 | for (range = 0; range < N_GREGS_RANGES; range++) |
493e2a69 MS |
160 | for (i = gregs_ranges[range].regno_start; |
161 | i <= gregs_ranges[range].regno_end; i++) | |
dfb64f85 | 162 | if (sparc_regmap[i] != -1) |
442ea881 | 163 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
1b3f6016 | 164 | |
442ea881 | 165 | sparc_fill_gregset_to_stack (regcache, buf); |
dfb64f85 DJ |
166 | } |
167 | ||
168 | static void | |
442ea881 | 169 | sparc_fill_fpregset (struct regcache *regcache, void *buf) |
dfb64f85 DJ |
170 | { |
171 | int i; | |
172 | int range; | |
1b3f6016 | 173 | |
dfb64f85 | 174 | for (range = 0; range < N_FPREGS_RANGES; range++) |
493e2a69 MS |
175 | for (i = fpregs_ranges[range].regno_start; |
176 | i <= fpregs_ranges[range].regno_end; i++) | |
442ea881 | 177 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
1b3f6016 | 178 | |
dfb64f85 DJ |
179 | } |
180 | ||
181 | static void | |
442ea881 | 182 | sparc_store_gregset_from_stack (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
183 | { |
184 | int i; | |
185 | CORE_ADDR addr = 0; | |
186 | unsigned char tmp_reg_buf[8]; | |
3aee8918 | 187 | const int l0_regno = find_regno (regcache->tdesc, "l0"); |
dfb64f85 DJ |
188 | const int i7_regno = l0_regno + 15; |
189 | ||
190 | /* These registers have to be obtained from the stack. */ | |
111217b3 | 191 | memcpy (&addr, |
3aee8918 | 192 | ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")], |
111217b3 | 193 | sizeof (addr)); |
dfb64f85 DJ |
194 | |
195 | addr += BIAS; | |
1b3f6016 | 196 | |
dfb64f85 DJ |
197 | for (i = l0_regno; i <= i7_regno; i++) |
198 | { | |
52405d85 | 199 | the_target->read_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
442ea881 | 200 | supply_register (regcache, i, tmp_reg_buf); |
111217b3 | 201 | addr += sizeof (tmp_reg_buf); |
dfb64f85 DJ |
202 | } |
203 | } | |
204 | ||
205 | static void | |
442ea881 | 206 | sparc_store_gregset (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
207 | { |
208 | int i; | |
209 | char zerobuf[8]; | |
210 | int range; | |
211 | ||
111217b3 | 212 | memset (zerobuf, 0, sizeof (zerobuf)); |
1b3f6016 | 213 | |
dfb64f85 | 214 | for (range = 0; range < N_GREGS_RANGES; range++) |
493e2a69 MS |
215 | for (i = gregs_ranges[range].regno_start; |
216 | i <= gregs_ranges[range].regno_end; i++) | |
dfb64f85 | 217 | if (sparc_regmap[i] != -1) |
442ea881 | 218 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
dfb64f85 | 219 | else |
442ea881 | 220 | supply_register (regcache, i, zerobuf); |
1b3f6016 | 221 | |
442ea881 | 222 | sparc_store_gregset_from_stack (regcache, buf); |
dfb64f85 DJ |
223 | } |
224 | ||
225 | static void | |
442ea881 | 226 | sparc_store_fpregset (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
227 | { |
228 | int i; | |
229 | int range; | |
1b3f6016 | 230 | |
dfb64f85 | 231 | for (range = 0; range < N_FPREGS_RANGES; range++) |
442ea881 PA |
232 | for (i = fpregs_ranges[range].regno_start; |
233 | i <= fpregs_ranges[range].regno_end; | |
234 | i++) | |
235 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); | |
dfb64f85 DJ |
236 | } |
237 | ||
dd373349 | 238 | static const gdb_byte sparc_breakpoint[INSN_SIZE] = { |
493e2a69 MS |
239 | 0x91, 0xd0, 0x20, 0x01 |
240 | }; | |
dfb64f85 DJ |
241 | #define sparc_breakpoint_len INSN_SIZE |
242 | ||
dd373349 AT |
243 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ |
244 | ||
245 | static const unsigned char * | |
246 | sparc_sw_breakpoint_from_kind (int kind, int *size) | |
247 | { | |
248 | *size = sparc_breakpoint_len; | |
249 | return sparc_breakpoint; | |
250 | } | |
dfb64f85 DJ |
251 | |
252 | static int | |
253 | sparc_breakpoint_at (CORE_ADDR where) | |
254 | { | |
255 | unsigned char insn[INSN_SIZE]; | |
256 | ||
52405d85 | 257 | the_target->read_memory (where, (unsigned char *) insn, sizeof (insn)); |
1b3f6016 | 258 | |
111217b3 | 259 | if (memcmp (sparc_breakpoint, insn, sizeof (insn)) == 0) |
dfb64f85 DJ |
260 | return 1; |
261 | ||
493e2a69 MS |
262 | /* If necessary, recognize more trap instructions here. GDB only |
263 | uses TRAP Always. */ | |
dfb64f85 DJ |
264 | |
265 | return 0; | |
266 | } | |
267 | ||
3aee8918 PA |
268 | static void |
269 | sparc_arch_setup (void) | |
270 | { | |
271 | current_process ()->tdesc = tdesc_sparc64; | |
272 | } | |
dfb64f85 | 273 | |
3aee8918 | 274 | static struct regset_info sparc_regsets[] = { |
1570b33e | 275 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
dfb64f85 DJ |
276 | GENERAL_REGS, |
277 | sparc_fill_gregset, sparc_store_gregset }, | |
1570b33e | 278 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t), |
dfb64f85 DJ |
279 | FP_REGS, |
280 | sparc_fill_fpregset, sparc_store_fpregset }, | |
50bc912a | 281 | NULL_REGSET |
dfb64f85 DJ |
282 | }; |
283 | ||
3aee8918 PA |
284 | static struct regsets_info sparc_regsets_info = |
285 | { | |
286 | sparc_regsets, /* regsets */ | |
287 | 0, /* num_regsets */ | |
288 | NULL, /* disabled_regsets */ | |
289 | }; | |
290 | ||
291 | static struct usrregs_info sparc_usrregs_info = | |
292 | { | |
293 | sparc_num_regs, | |
294 | /* No regmap needs to be provided since this impl. doesn't use | |
295 | USRREGS. */ | |
296 | NULL | |
297 | }; | |
298 | ||
299 | static struct regs_info regs_info = | |
300 | { | |
301 | NULL, /* regset_bitmap */ | |
302 | &sparc_usrregs_info, | |
303 | &sparc_regsets_info | |
304 | }; | |
305 | ||
306 | static const struct regs_info * | |
307 | sparc_regs_info (void) | |
308 | { | |
309 | return ®s_info; | |
310 | } | |
311 | ||
dfb64f85 | 312 | struct linux_target_ops the_low_target = { |
3aee8918 PA |
313 | sparc_arch_setup, |
314 | sparc_regs_info, | |
dfb64f85 DJ |
315 | sparc_cannot_fetch_register, |
316 | sparc_cannot_store_register, | |
c14dfd32 | 317 | NULL, /* fetch_register */ |
6f69e520 | 318 | linux_get_pc_64bit, |
dfb64f85 DJ |
319 | /* No sparc_set_pc is needed. */ |
320 | NULL, | |
dd373349 AT |
321 | NULL, /* breakpoint_kind_from_pc */ |
322 | sparc_sw_breakpoint_from_kind, | |
fa5308bd | 323 | NULL, /* get_next_pcs */ |
dfb64f85 DJ |
324 | 0, |
325 | sparc_breakpoint_at, | |
802e8e6d | 326 | NULL, /* supports_z_point_type */ |
dfb64f85 DJ |
327 | NULL, NULL, NULL, NULL, |
328 | NULL, NULL | |
329 | }; | |
3aee8918 | 330 | |
ef0478f6 TBA |
331 | /* The linux target ops object. */ |
332 | ||
333 | linux_process_target *the_linux_target = &the_sparc_target; | |
334 | ||
3aee8918 PA |
335 | void |
336 | initialize_low_arch (void) | |
337 | { | |
338 | /* Initialize the Linux target descriptions. */ | |
339 | init_registers_sparc64 (); | |
340 | ||
341 | initialize_regsets_info (&sparc_regsets_info); | |
342 | } |