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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 | ||
797bcff5 TBA |
51 | protected: |
52 | ||
53 | void low_arch_setup () override; | |
ef0478f6 TBA |
54 | }; |
55 | ||
56 | /* The singleton target ops object. */ | |
57 | ||
58 | static sparc_target the_sparc_target; | |
59 | ||
dfb64f85 DJ |
60 | /* Each offset is multiplied by 8, because of the register size. |
61 | These offsets apply to the buffer sent/filled by ptrace. | |
62 | Additionally, the array elements order corresponds to the .dat file, and the | |
63 | gdb's registers enumeration order. */ | |
64 | ||
65 | static int sparc_regmap[] = { | |
66 | /* These offsets correspond to GET/SETREGSET. */ | |
493e2a69 MS |
67 | -1, 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, /* g0 .. g7 */ |
68 | 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, /* o0 .. o5, sp, o7 */ | |
69 | -1, -1, -1, -1, -1, -1, -1, -1, /* l0 .. l7 */ | |
70 | -1, -1, -1, -1, -1, -1, -1, -1, /* i0 .. i5, fp, i7 */ | |
dfb64f85 DJ |
71 | |
72 | /* Floating point registers offsets correspond to GET/SETFPREGSET. */ | |
73 | 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4, /* f0 .. f7 */ | |
74 | 8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4, /* f8 .. f15 */ | |
75 | 16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4, /* f16 .. f23 */ | |
76 | 24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4, /* f24 .. f31 */ | |
77 | ||
78 | /* F32 offset starts next to f31: 31*4+4 = 16 * 8. */ | |
1b3f6016 PA |
79 | 16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8, /* f32 .. f46 */ |
80 | 24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8, /* f48 .. f62 */ | |
dfb64f85 DJ |
81 | |
82 | 17 *8, /* pc */ | |
83 | 18 *8, /* npc */ | |
84 | 16 *8, /* state */ | |
493e2a69 MS |
85 | /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed |
86 | next to f62. */ | |
dfb64f85 DJ |
87 | 32 *8, /* fsr */ |
88 | -1, /* fprs */ | |
89 | /* Y register is 32-bits length, but gdb takes care of that. */ | |
90 | 19 *8, /* y */ | |
91 | ||
92 | }; | |
93 | ||
94 | ||
95 | struct regs_range_t | |
96 | { | |
97 | int regno_start; | |
98 | int regno_end; | |
99 | }; | |
100 | ||
101 | static const struct regs_range_t gregs_ranges[] = { | |
102 | { 0, 31 }, /* g0 .. i7 */ | |
103 | { 80, 82 }, /* pc .. state */ | |
104 | { 84, 85 } /* fprs .. y */ | |
105 | }; | |
106 | ||
107 | #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t)) | |
108 | ||
109 | static const struct regs_range_t fpregs_ranges[] = { | |
110 | { 32, 79 }, /* f0 .. f62 */ | |
111 | { 83, 83 } /* fsr */ | |
112 | }; | |
113 | ||
114 | #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t)) | |
115 | ||
116 | /* Defined in auto-generated file reg-sparc64.c. */ | |
117 | void init_registers_sparc64 (void); | |
3aee8918 | 118 | extern const struct target_desc *tdesc_sparc64; |
dfb64f85 DJ |
119 | |
120 | static int | |
121 | sparc_cannot_store_register (int regno) | |
122 | { | |
123 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); | |
124 | } | |
125 | ||
126 | static int | |
127 | sparc_cannot_fetch_register (int regno) | |
128 | { | |
129 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); | |
130 | } | |
131 | ||
132 | static void | |
442ea881 | 133 | sparc_fill_gregset_to_stack (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
134 | { |
135 | int i; | |
136 | CORE_ADDR addr = 0; | |
137 | unsigned char tmp_reg_buf[8]; | |
3aee8918 | 138 | const int l0_regno = find_regno (regcache->tdesc, "l0"); |
dfb64f85 DJ |
139 | const int i7_regno = l0_regno + 15; |
140 | ||
141 | /* These registers have to be stored in the stack. */ | |
111217b3 | 142 | memcpy (&addr, |
3aee8918 | 143 | ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")], |
111217b3 | 144 | sizeof (addr)); |
dfb64f85 DJ |
145 | |
146 | addr += BIAS; | |
1b3f6016 | 147 | |
dfb64f85 DJ |
148 | for (i = l0_regno; i <= i7_regno; i++) |
149 | { | |
442ea881 | 150 | collect_register (regcache, i, tmp_reg_buf); |
52405d85 | 151 | the_target->write_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
111217b3 | 152 | addr += sizeof (tmp_reg_buf); |
dfb64f85 DJ |
153 | } |
154 | } | |
155 | ||
156 | static void | |
442ea881 | 157 | sparc_fill_gregset (struct regcache *regcache, void *buf) |
dfb64f85 DJ |
158 | { |
159 | int i; | |
160 | int range; | |
1b3f6016 | 161 | |
dfb64f85 | 162 | for (range = 0; range < N_GREGS_RANGES; range++) |
493e2a69 MS |
163 | for (i = gregs_ranges[range].regno_start; |
164 | i <= gregs_ranges[range].regno_end; i++) | |
dfb64f85 | 165 | if (sparc_regmap[i] != -1) |
442ea881 | 166 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
1b3f6016 | 167 | |
442ea881 | 168 | sparc_fill_gregset_to_stack (regcache, buf); |
dfb64f85 DJ |
169 | } |
170 | ||
171 | static void | |
442ea881 | 172 | sparc_fill_fpregset (struct regcache *regcache, void *buf) |
dfb64f85 DJ |
173 | { |
174 | int i; | |
175 | int range; | |
1b3f6016 | 176 | |
dfb64f85 | 177 | for (range = 0; range < N_FPREGS_RANGES; range++) |
493e2a69 MS |
178 | for (i = fpregs_ranges[range].regno_start; |
179 | i <= fpregs_ranges[range].regno_end; i++) | |
442ea881 | 180 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
1b3f6016 | 181 | |
dfb64f85 DJ |
182 | } |
183 | ||
184 | static void | |
442ea881 | 185 | sparc_store_gregset_from_stack (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
186 | { |
187 | int i; | |
188 | CORE_ADDR addr = 0; | |
189 | unsigned char tmp_reg_buf[8]; | |
3aee8918 | 190 | const int l0_regno = find_regno (regcache->tdesc, "l0"); |
dfb64f85 DJ |
191 | const int i7_regno = l0_regno + 15; |
192 | ||
193 | /* These registers have to be obtained from the stack. */ | |
111217b3 | 194 | memcpy (&addr, |
3aee8918 | 195 | ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")], |
111217b3 | 196 | sizeof (addr)); |
dfb64f85 DJ |
197 | |
198 | addr += BIAS; | |
1b3f6016 | 199 | |
dfb64f85 DJ |
200 | for (i = l0_regno; i <= i7_regno; i++) |
201 | { | |
52405d85 | 202 | the_target->read_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
442ea881 | 203 | supply_register (regcache, i, tmp_reg_buf); |
111217b3 | 204 | addr += sizeof (tmp_reg_buf); |
dfb64f85 DJ |
205 | } |
206 | } | |
207 | ||
208 | static void | |
442ea881 | 209 | sparc_store_gregset (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
210 | { |
211 | int i; | |
212 | char zerobuf[8]; | |
213 | int range; | |
214 | ||
111217b3 | 215 | memset (zerobuf, 0, sizeof (zerobuf)); |
1b3f6016 | 216 | |
dfb64f85 | 217 | for (range = 0; range < N_GREGS_RANGES; range++) |
493e2a69 MS |
218 | for (i = gregs_ranges[range].regno_start; |
219 | i <= gregs_ranges[range].regno_end; i++) | |
dfb64f85 | 220 | if (sparc_regmap[i] != -1) |
442ea881 | 221 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
dfb64f85 | 222 | else |
442ea881 | 223 | supply_register (regcache, i, zerobuf); |
1b3f6016 | 224 | |
442ea881 | 225 | sparc_store_gregset_from_stack (regcache, buf); |
dfb64f85 DJ |
226 | } |
227 | ||
228 | static void | |
442ea881 | 229 | sparc_store_fpregset (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
230 | { |
231 | int i; | |
232 | int range; | |
1b3f6016 | 233 | |
dfb64f85 | 234 | for (range = 0; range < N_FPREGS_RANGES; range++) |
442ea881 PA |
235 | for (i = fpregs_ranges[range].regno_start; |
236 | i <= fpregs_ranges[range].regno_end; | |
237 | i++) | |
238 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); | |
dfb64f85 DJ |
239 | } |
240 | ||
dd373349 | 241 | static const gdb_byte sparc_breakpoint[INSN_SIZE] = { |
493e2a69 MS |
242 | 0x91, 0xd0, 0x20, 0x01 |
243 | }; | |
dfb64f85 DJ |
244 | #define sparc_breakpoint_len INSN_SIZE |
245 | ||
dd373349 AT |
246 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ |
247 | ||
248 | static const unsigned char * | |
249 | sparc_sw_breakpoint_from_kind (int kind, int *size) | |
250 | { | |
251 | *size = sparc_breakpoint_len; | |
252 | return sparc_breakpoint; | |
253 | } | |
dfb64f85 DJ |
254 | |
255 | static int | |
256 | sparc_breakpoint_at (CORE_ADDR where) | |
257 | { | |
258 | unsigned char insn[INSN_SIZE]; | |
259 | ||
52405d85 | 260 | the_target->read_memory (where, (unsigned char *) insn, sizeof (insn)); |
1b3f6016 | 261 | |
111217b3 | 262 | if (memcmp (sparc_breakpoint, insn, sizeof (insn)) == 0) |
dfb64f85 DJ |
263 | return 1; |
264 | ||
493e2a69 MS |
265 | /* If necessary, recognize more trap instructions here. GDB only |
266 | uses TRAP Always. */ | |
dfb64f85 DJ |
267 | |
268 | return 0; | |
269 | } | |
270 | ||
797bcff5 TBA |
271 | void |
272 | sparc_target::low_arch_setup () | |
3aee8918 PA |
273 | { |
274 | current_process ()->tdesc = tdesc_sparc64; | |
275 | } | |
dfb64f85 | 276 | |
3aee8918 | 277 | static struct regset_info sparc_regsets[] = { |
1570b33e | 278 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
dfb64f85 DJ |
279 | GENERAL_REGS, |
280 | sparc_fill_gregset, sparc_store_gregset }, | |
1570b33e | 281 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t), |
dfb64f85 DJ |
282 | FP_REGS, |
283 | sparc_fill_fpregset, sparc_store_fpregset }, | |
50bc912a | 284 | NULL_REGSET |
dfb64f85 DJ |
285 | }; |
286 | ||
3aee8918 PA |
287 | static struct regsets_info sparc_regsets_info = |
288 | { | |
289 | sparc_regsets, /* regsets */ | |
290 | 0, /* num_regsets */ | |
291 | NULL, /* disabled_regsets */ | |
292 | }; | |
293 | ||
294 | static struct usrregs_info sparc_usrregs_info = | |
295 | { | |
296 | sparc_num_regs, | |
297 | /* No regmap needs to be provided since this impl. doesn't use | |
298 | USRREGS. */ | |
299 | NULL | |
300 | }; | |
301 | ||
302 | static struct regs_info regs_info = | |
303 | { | |
304 | NULL, /* regset_bitmap */ | |
305 | &sparc_usrregs_info, | |
306 | &sparc_regsets_info | |
307 | }; | |
308 | ||
309 | static const struct regs_info * | |
310 | sparc_regs_info (void) | |
311 | { | |
312 | return ®s_info; | |
313 | } | |
314 | ||
dfb64f85 | 315 | struct linux_target_ops the_low_target = { |
3aee8918 | 316 | sparc_regs_info, |
dfb64f85 DJ |
317 | sparc_cannot_fetch_register, |
318 | sparc_cannot_store_register, | |
c14dfd32 | 319 | NULL, /* fetch_register */ |
6f69e520 | 320 | linux_get_pc_64bit, |
dfb64f85 DJ |
321 | /* No sparc_set_pc is needed. */ |
322 | NULL, | |
dd373349 AT |
323 | NULL, /* breakpoint_kind_from_pc */ |
324 | sparc_sw_breakpoint_from_kind, | |
fa5308bd | 325 | NULL, /* get_next_pcs */ |
dfb64f85 DJ |
326 | 0, |
327 | sparc_breakpoint_at, | |
802e8e6d | 328 | NULL, /* supports_z_point_type */ |
dfb64f85 DJ |
329 | NULL, NULL, NULL, NULL, |
330 | NULL, NULL | |
331 | }; | |
3aee8918 | 332 | |
ef0478f6 TBA |
333 | /* The linux target ops object. */ |
334 | ||
335 | linux_process_target *the_linux_target = &the_sparc_target; | |
336 | ||
3aee8918 PA |
337 | void |
338 | initialize_low_arch (void) | |
339 | { | |
340 | /* Initialize the Linux target descriptions. */ | |
341 | init_registers_sparc64 (); | |
342 | ||
343 | initialize_regsets_info (&sparc_regsets_info); | |
344 | } |