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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 | ||
797bcff5 TBA |
53 | protected: |
54 | ||
55 | void low_arch_setup () override; | |
ef0478f6 TBA |
56 | }; |
57 | ||
58 | /* The singleton target ops object. */ | |
59 | ||
60 | static sparc_target the_sparc_target; | |
61 | ||
dfb64f85 DJ |
62 | /* Each offset is multiplied by 8, because of the register size. |
63 | These offsets apply to the buffer sent/filled by ptrace. | |
64 | Additionally, the array elements order corresponds to the .dat file, and the | |
65 | gdb's registers enumeration order. */ | |
66 | ||
67 | static int sparc_regmap[] = { | |
68 | /* These offsets correspond to GET/SETREGSET. */ | |
493e2a69 MS |
69 | -1, 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, /* g0 .. g7 */ |
70 | 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, /* o0 .. o5, sp, o7 */ | |
71 | -1, -1, -1, -1, -1, -1, -1, -1, /* l0 .. l7 */ | |
72 | -1, -1, -1, -1, -1, -1, -1, -1, /* i0 .. i5, fp, i7 */ | |
dfb64f85 DJ |
73 | |
74 | /* Floating point registers offsets correspond to GET/SETFPREGSET. */ | |
75 | 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4, /* f0 .. f7 */ | |
76 | 8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4, /* f8 .. f15 */ | |
77 | 16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4, /* f16 .. f23 */ | |
78 | 24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4, /* f24 .. f31 */ | |
79 | ||
80 | /* F32 offset starts next to f31: 31*4+4 = 16 * 8. */ | |
1b3f6016 PA |
81 | 16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8, /* f32 .. f46 */ |
82 | 24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8, /* f48 .. f62 */ | |
dfb64f85 DJ |
83 | |
84 | 17 *8, /* pc */ | |
85 | 18 *8, /* npc */ | |
86 | 16 *8, /* state */ | |
493e2a69 MS |
87 | /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed |
88 | next to f62. */ | |
dfb64f85 DJ |
89 | 32 *8, /* fsr */ |
90 | -1, /* fprs */ | |
91 | /* Y register is 32-bits length, but gdb takes care of that. */ | |
92 | 19 *8, /* y */ | |
93 | ||
94 | }; | |
95 | ||
96 | ||
97 | struct regs_range_t | |
98 | { | |
99 | int regno_start; | |
100 | int regno_end; | |
101 | }; | |
102 | ||
103 | static const struct regs_range_t gregs_ranges[] = { | |
104 | { 0, 31 }, /* g0 .. i7 */ | |
105 | { 80, 82 }, /* pc .. state */ | |
106 | { 84, 85 } /* fprs .. y */ | |
107 | }; | |
108 | ||
109 | #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t)) | |
110 | ||
111 | static const struct regs_range_t fpregs_ranges[] = { | |
112 | { 32, 79 }, /* f0 .. f62 */ | |
113 | { 83, 83 } /* fsr */ | |
114 | }; | |
115 | ||
116 | #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t)) | |
117 | ||
118 | /* Defined in auto-generated file reg-sparc64.c. */ | |
119 | void init_registers_sparc64 (void); | |
3aee8918 | 120 | extern const struct target_desc *tdesc_sparc64; |
dfb64f85 DJ |
121 | |
122 | static int | |
123 | sparc_cannot_store_register (int regno) | |
124 | { | |
125 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); | |
126 | } | |
127 | ||
128 | static int | |
129 | sparc_cannot_fetch_register (int regno) | |
130 | { | |
131 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); | |
132 | } | |
133 | ||
134 | static void | |
442ea881 | 135 | sparc_fill_gregset_to_stack (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
136 | { |
137 | int i; | |
138 | CORE_ADDR addr = 0; | |
139 | unsigned char tmp_reg_buf[8]; | |
3aee8918 | 140 | const int l0_regno = find_regno (regcache->tdesc, "l0"); |
dfb64f85 DJ |
141 | const int i7_regno = l0_regno + 15; |
142 | ||
143 | /* These registers have to be stored in the stack. */ | |
111217b3 | 144 | memcpy (&addr, |
3aee8918 | 145 | ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")], |
111217b3 | 146 | sizeof (addr)); |
dfb64f85 DJ |
147 | |
148 | addr += BIAS; | |
1b3f6016 | 149 | |
dfb64f85 DJ |
150 | for (i = l0_regno; i <= i7_regno; i++) |
151 | { | |
442ea881 | 152 | collect_register (regcache, i, tmp_reg_buf); |
52405d85 | 153 | the_target->write_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
111217b3 | 154 | addr += sizeof (tmp_reg_buf); |
dfb64f85 DJ |
155 | } |
156 | } | |
157 | ||
158 | static void | |
442ea881 | 159 | sparc_fill_gregset (struct regcache *regcache, void *buf) |
dfb64f85 DJ |
160 | { |
161 | int i; | |
162 | int range; | |
1b3f6016 | 163 | |
dfb64f85 | 164 | for (range = 0; range < N_GREGS_RANGES; range++) |
493e2a69 MS |
165 | for (i = gregs_ranges[range].regno_start; |
166 | i <= gregs_ranges[range].regno_end; i++) | |
dfb64f85 | 167 | if (sparc_regmap[i] != -1) |
442ea881 | 168 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
1b3f6016 | 169 | |
442ea881 | 170 | sparc_fill_gregset_to_stack (regcache, buf); |
dfb64f85 DJ |
171 | } |
172 | ||
173 | static void | |
442ea881 | 174 | sparc_fill_fpregset (struct regcache *regcache, void *buf) |
dfb64f85 DJ |
175 | { |
176 | int i; | |
177 | int range; | |
1b3f6016 | 178 | |
dfb64f85 | 179 | for (range = 0; range < N_FPREGS_RANGES; range++) |
493e2a69 MS |
180 | for (i = fpregs_ranges[range].regno_start; |
181 | i <= fpregs_ranges[range].regno_end; i++) | |
442ea881 | 182 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
1b3f6016 | 183 | |
dfb64f85 DJ |
184 | } |
185 | ||
186 | static void | |
442ea881 | 187 | sparc_store_gregset_from_stack (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
188 | { |
189 | int i; | |
190 | CORE_ADDR addr = 0; | |
191 | unsigned char tmp_reg_buf[8]; | |
3aee8918 | 192 | const int l0_regno = find_regno (regcache->tdesc, "l0"); |
dfb64f85 DJ |
193 | const int i7_regno = l0_regno + 15; |
194 | ||
195 | /* These registers have to be obtained from the stack. */ | |
111217b3 | 196 | memcpy (&addr, |
3aee8918 | 197 | ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")], |
111217b3 | 198 | sizeof (addr)); |
dfb64f85 DJ |
199 | |
200 | addr += BIAS; | |
1b3f6016 | 201 | |
dfb64f85 DJ |
202 | for (i = l0_regno; i <= i7_regno; i++) |
203 | { | |
52405d85 | 204 | the_target->read_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
442ea881 | 205 | supply_register (regcache, i, tmp_reg_buf); |
111217b3 | 206 | addr += sizeof (tmp_reg_buf); |
dfb64f85 DJ |
207 | } |
208 | } | |
209 | ||
210 | static void | |
442ea881 | 211 | sparc_store_gregset (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
212 | { |
213 | int i; | |
214 | char zerobuf[8]; | |
215 | int range; | |
216 | ||
111217b3 | 217 | memset (zerobuf, 0, sizeof (zerobuf)); |
1b3f6016 | 218 | |
dfb64f85 | 219 | for (range = 0; range < N_GREGS_RANGES; range++) |
493e2a69 MS |
220 | for (i = gregs_ranges[range].regno_start; |
221 | i <= gregs_ranges[range].regno_end; i++) | |
dfb64f85 | 222 | if (sparc_regmap[i] != -1) |
442ea881 | 223 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
dfb64f85 | 224 | else |
442ea881 | 225 | supply_register (regcache, i, zerobuf); |
1b3f6016 | 226 | |
442ea881 | 227 | sparc_store_gregset_from_stack (regcache, buf); |
dfb64f85 DJ |
228 | } |
229 | ||
230 | static void | |
442ea881 | 231 | sparc_store_fpregset (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
232 | { |
233 | int i; | |
234 | int range; | |
1b3f6016 | 235 | |
dfb64f85 | 236 | for (range = 0; range < N_FPREGS_RANGES; range++) |
442ea881 PA |
237 | for (i = fpregs_ranges[range].regno_start; |
238 | i <= fpregs_ranges[range].regno_end; | |
239 | i++) | |
240 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); | |
dfb64f85 DJ |
241 | } |
242 | ||
dd373349 | 243 | static const gdb_byte sparc_breakpoint[INSN_SIZE] = { |
493e2a69 MS |
244 | 0x91, 0xd0, 0x20, 0x01 |
245 | }; | |
dfb64f85 DJ |
246 | #define sparc_breakpoint_len INSN_SIZE |
247 | ||
dd373349 AT |
248 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ |
249 | ||
250 | static const unsigned char * | |
251 | sparc_sw_breakpoint_from_kind (int kind, int *size) | |
252 | { | |
253 | *size = sparc_breakpoint_len; | |
254 | return sparc_breakpoint; | |
255 | } | |
dfb64f85 DJ |
256 | |
257 | static int | |
258 | sparc_breakpoint_at (CORE_ADDR where) | |
259 | { | |
260 | unsigned char insn[INSN_SIZE]; | |
261 | ||
52405d85 | 262 | the_target->read_memory (where, (unsigned char *) insn, sizeof (insn)); |
1b3f6016 | 263 | |
111217b3 | 264 | if (memcmp (sparc_breakpoint, insn, sizeof (insn)) == 0) |
dfb64f85 DJ |
265 | return 1; |
266 | ||
493e2a69 MS |
267 | /* If necessary, recognize more trap instructions here. GDB only |
268 | uses TRAP Always. */ | |
dfb64f85 DJ |
269 | |
270 | return 0; | |
271 | } | |
272 | ||
797bcff5 TBA |
273 | void |
274 | sparc_target::low_arch_setup () | |
3aee8918 PA |
275 | { |
276 | current_process ()->tdesc = tdesc_sparc64; | |
277 | } | |
dfb64f85 | 278 | |
3aee8918 | 279 | static struct regset_info sparc_regsets[] = { |
1570b33e | 280 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
dfb64f85 DJ |
281 | GENERAL_REGS, |
282 | sparc_fill_gregset, sparc_store_gregset }, | |
1570b33e | 283 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t), |
dfb64f85 DJ |
284 | FP_REGS, |
285 | sparc_fill_fpregset, sparc_store_fpregset }, | |
50bc912a | 286 | NULL_REGSET |
dfb64f85 DJ |
287 | }; |
288 | ||
3aee8918 PA |
289 | static struct regsets_info sparc_regsets_info = |
290 | { | |
291 | sparc_regsets, /* regsets */ | |
292 | 0, /* num_regsets */ | |
293 | NULL, /* disabled_regsets */ | |
294 | }; | |
295 | ||
296 | static struct usrregs_info sparc_usrregs_info = | |
297 | { | |
298 | sparc_num_regs, | |
299 | /* No regmap needs to be provided since this impl. doesn't use | |
300 | USRREGS. */ | |
301 | NULL | |
302 | }; | |
303 | ||
aa8d21c9 | 304 | static struct regs_info myregs_info = |
3aee8918 PA |
305 | { |
306 | NULL, /* regset_bitmap */ | |
307 | &sparc_usrregs_info, | |
308 | &sparc_regsets_info | |
309 | }; | |
310 | ||
aa8d21c9 TBA |
311 | const regs_info * |
312 | sparc_target::get_regs_info () | |
3aee8918 | 313 | { |
aa8d21c9 | 314 | return &myregs_info; |
3aee8918 PA |
315 | } |
316 | ||
dfb64f85 | 317 | struct linux_target_ops the_low_target = { |
dfb64f85 DJ |
318 | sparc_cannot_fetch_register, |
319 | sparc_cannot_store_register, | |
c14dfd32 | 320 | NULL, /* fetch_register */ |
6f69e520 | 321 | linux_get_pc_64bit, |
dfb64f85 DJ |
322 | /* No sparc_set_pc is needed. */ |
323 | NULL, | |
dd373349 AT |
324 | NULL, /* breakpoint_kind_from_pc */ |
325 | sparc_sw_breakpoint_from_kind, | |
fa5308bd | 326 | NULL, /* get_next_pcs */ |
dfb64f85 DJ |
327 | 0, |
328 | sparc_breakpoint_at, | |
802e8e6d | 329 | NULL, /* supports_z_point_type */ |
dfb64f85 DJ |
330 | NULL, NULL, NULL, NULL, |
331 | NULL, NULL | |
332 | }; | |
3aee8918 | 333 | |
ef0478f6 TBA |
334 | /* The linux target ops object. */ |
335 | ||
336 | linux_process_target *the_linux_target = &the_sparc_target; | |
337 | ||
3aee8918 PA |
338 | void |
339 | initialize_low_arch (void) | |
340 | { | |
341 | /* Initialize the Linux target descriptions. */ | |
342 | init_registers_sparc64 (); | |
343 | ||
344 | initialize_regsets_info (&sparc_regsets_info); | |
345 | } |