Commit | Line | Data |
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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; | |
daca57a7 TBA |
56 | |
57 | bool low_cannot_fetch_register (int regno) override; | |
58 | ||
59 | bool low_cannot_store_register (int regno) override; | |
ef0478f6 TBA |
60 | }; |
61 | ||
62 | /* The singleton target ops object. */ | |
63 | ||
64 | static sparc_target the_sparc_target; | |
65 | ||
dfb64f85 DJ |
66 | /* Each offset is multiplied by 8, because of the register size. |
67 | These offsets apply to the buffer sent/filled by ptrace. | |
68 | Additionally, the array elements order corresponds to the .dat file, and the | |
69 | gdb's registers enumeration order. */ | |
70 | ||
71 | static int sparc_regmap[] = { | |
72 | /* These offsets correspond to GET/SETREGSET. */ | |
493e2a69 MS |
73 | -1, 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, /* g0 .. g7 */ |
74 | 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, /* o0 .. o5, sp, o7 */ | |
75 | -1, -1, -1, -1, -1, -1, -1, -1, /* l0 .. l7 */ | |
76 | -1, -1, -1, -1, -1, -1, -1, -1, /* i0 .. i5, fp, i7 */ | |
dfb64f85 DJ |
77 | |
78 | /* Floating point registers offsets correspond to GET/SETFPREGSET. */ | |
79 | 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4, /* f0 .. f7 */ | |
80 | 8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4, /* f8 .. f15 */ | |
81 | 16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4, /* f16 .. f23 */ | |
82 | 24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4, /* f24 .. f31 */ | |
83 | ||
84 | /* F32 offset starts next to f31: 31*4+4 = 16 * 8. */ | |
1b3f6016 PA |
85 | 16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8, /* f32 .. f46 */ |
86 | 24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8, /* f48 .. f62 */ | |
dfb64f85 DJ |
87 | |
88 | 17 *8, /* pc */ | |
89 | 18 *8, /* npc */ | |
90 | 16 *8, /* state */ | |
493e2a69 MS |
91 | /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed |
92 | next to f62. */ | |
dfb64f85 DJ |
93 | 32 *8, /* fsr */ |
94 | -1, /* fprs */ | |
95 | /* Y register is 32-bits length, but gdb takes care of that. */ | |
96 | 19 *8, /* y */ | |
97 | ||
98 | }; | |
99 | ||
100 | ||
101 | struct regs_range_t | |
102 | { | |
103 | int regno_start; | |
104 | int regno_end; | |
105 | }; | |
106 | ||
107 | static const struct regs_range_t gregs_ranges[] = { | |
108 | { 0, 31 }, /* g0 .. i7 */ | |
109 | { 80, 82 }, /* pc .. state */ | |
110 | { 84, 85 } /* fprs .. y */ | |
111 | }; | |
112 | ||
113 | #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t)) | |
114 | ||
115 | static const struct regs_range_t fpregs_ranges[] = { | |
116 | { 32, 79 }, /* f0 .. f62 */ | |
117 | { 83, 83 } /* fsr */ | |
118 | }; | |
119 | ||
120 | #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t)) | |
121 | ||
122 | /* Defined in auto-generated file reg-sparc64.c. */ | |
123 | void init_registers_sparc64 (void); | |
3aee8918 | 124 | extern const struct target_desc *tdesc_sparc64; |
dfb64f85 | 125 | |
daca57a7 TBA |
126 | bool |
127 | sparc_target::low_cannot_store_register (int regno) | |
dfb64f85 DJ |
128 | { |
129 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); | |
130 | } | |
131 | ||
daca57a7 TBA |
132 | bool |
133 | sparc_target::low_cannot_fetch_register (int regno) | |
dfb64f85 DJ |
134 | { |
135 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); | |
136 | } | |
137 | ||
138 | static void | |
442ea881 | 139 | sparc_fill_gregset_to_stack (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
140 | { |
141 | int i; | |
142 | CORE_ADDR addr = 0; | |
143 | unsigned char tmp_reg_buf[8]; | |
3aee8918 | 144 | const int l0_regno = find_regno (regcache->tdesc, "l0"); |
dfb64f85 DJ |
145 | const int i7_regno = l0_regno + 15; |
146 | ||
147 | /* These registers have to be stored in the stack. */ | |
111217b3 | 148 | memcpy (&addr, |
3aee8918 | 149 | ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")], |
111217b3 | 150 | sizeof (addr)); |
dfb64f85 DJ |
151 | |
152 | addr += BIAS; | |
1b3f6016 | 153 | |
dfb64f85 DJ |
154 | for (i = l0_regno; i <= i7_regno; i++) |
155 | { | |
442ea881 | 156 | collect_register (regcache, i, tmp_reg_buf); |
52405d85 | 157 | the_target->write_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
111217b3 | 158 | addr += sizeof (tmp_reg_buf); |
dfb64f85 DJ |
159 | } |
160 | } | |
161 | ||
162 | static void | |
442ea881 | 163 | sparc_fill_gregset (struct regcache *regcache, void *buf) |
dfb64f85 DJ |
164 | { |
165 | int i; | |
166 | int range; | |
1b3f6016 | 167 | |
dfb64f85 | 168 | for (range = 0; range < N_GREGS_RANGES; range++) |
493e2a69 MS |
169 | for (i = gregs_ranges[range].regno_start; |
170 | i <= gregs_ranges[range].regno_end; i++) | |
dfb64f85 | 171 | if (sparc_regmap[i] != -1) |
442ea881 | 172 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
1b3f6016 | 173 | |
442ea881 | 174 | sparc_fill_gregset_to_stack (regcache, buf); |
dfb64f85 DJ |
175 | } |
176 | ||
177 | static void | |
442ea881 | 178 | sparc_fill_fpregset (struct regcache *regcache, void *buf) |
dfb64f85 DJ |
179 | { |
180 | int i; | |
181 | int range; | |
1b3f6016 | 182 | |
dfb64f85 | 183 | for (range = 0; range < N_FPREGS_RANGES; range++) |
493e2a69 MS |
184 | for (i = fpregs_ranges[range].regno_start; |
185 | i <= fpregs_ranges[range].regno_end; i++) | |
442ea881 | 186 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
1b3f6016 | 187 | |
dfb64f85 DJ |
188 | } |
189 | ||
190 | static void | |
442ea881 | 191 | sparc_store_gregset_from_stack (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
192 | { |
193 | int i; | |
194 | CORE_ADDR addr = 0; | |
195 | unsigned char tmp_reg_buf[8]; | |
3aee8918 | 196 | const int l0_regno = find_regno (regcache->tdesc, "l0"); |
dfb64f85 DJ |
197 | const int i7_regno = l0_regno + 15; |
198 | ||
199 | /* These registers have to be obtained from the stack. */ | |
111217b3 | 200 | memcpy (&addr, |
3aee8918 | 201 | ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")], |
111217b3 | 202 | sizeof (addr)); |
dfb64f85 DJ |
203 | |
204 | addr += BIAS; | |
1b3f6016 | 205 | |
dfb64f85 DJ |
206 | for (i = l0_regno; i <= i7_regno; i++) |
207 | { | |
52405d85 | 208 | the_target->read_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
442ea881 | 209 | supply_register (regcache, i, tmp_reg_buf); |
111217b3 | 210 | addr += sizeof (tmp_reg_buf); |
dfb64f85 DJ |
211 | } |
212 | } | |
213 | ||
214 | static void | |
442ea881 | 215 | sparc_store_gregset (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
216 | { |
217 | int i; | |
218 | char zerobuf[8]; | |
219 | int range; | |
220 | ||
111217b3 | 221 | memset (zerobuf, 0, sizeof (zerobuf)); |
1b3f6016 | 222 | |
dfb64f85 | 223 | for (range = 0; range < N_GREGS_RANGES; range++) |
493e2a69 MS |
224 | for (i = gregs_ranges[range].regno_start; |
225 | i <= gregs_ranges[range].regno_end; i++) | |
dfb64f85 | 226 | if (sparc_regmap[i] != -1) |
442ea881 | 227 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
dfb64f85 | 228 | else |
442ea881 | 229 | supply_register (regcache, i, zerobuf); |
1b3f6016 | 230 | |
442ea881 | 231 | sparc_store_gregset_from_stack (regcache, buf); |
dfb64f85 DJ |
232 | } |
233 | ||
234 | static void | |
442ea881 | 235 | sparc_store_fpregset (struct regcache *regcache, const void *buf) |
dfb64f85 DJ |
236 | { |
237 | int i; | |
238 | int range; | |
1b3f6016 | 239 | |
dfb64f85 | 240 | for (range = 0; range < N_FPREGS_RANGES; range++) |
442ea881 PA |
241 | for (i = fpregs_ranges[range].regno_start; |
242 | i <= fpregs_ranges[range].regno_end; | |
243 | i++) | |
244 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); | |
dfb64f85 DJ |
245 | } |
246 | ||
dd373349 | 247 | static const gdb_byte sparc_breakpoint[INSN_SIZE] = { |
493e2a69 MS |
248 | 0x91, 0xd0, 0x20, 0x01 |
249 | }; | |
dfb64f85 DJ |
250 | #define sparc_breakpoint_len INSN_SIZE |
251 | ||
dd373349 AT |
252 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ |
253 | ||
254 | static const unsigned char * | |
255 | sparc_sw_breakpoint_from_kind (int kind, int *size) | |
256 | { | |
257 | *size = sparc_breakpoint_len; | |
258 | return sparc_breakpoint; | |
259 | } | |
dfb64f85 DJ |
260 | |
261 | static int | |
262 | sparc_breakpoint_at (CORE_ADDR where) | |
263 | { | |
264 | unsigned char insn[INSN_SIZE]; | |
265 | ||
52405d85 | 266 | the_target->read_memory (where, (unsigned char *) insn, sizeof (insn)); |
1b3f6016 | 267 | |
111217b3 | 268 | if (memcmp (sparc_breakpoint, insn, sizeof (insn)) == 0) |
dfb64f85 DJ |
269 | return 1; |
270 | ||
493e2a69 MS |
271 | /* If necessary, recognize more trap instructions here. GDB only |
272 | uses TRAP Always. */ | |
dfb64f85 DJ |
273 | |
274 | return 0; | |
275 | } | |
276 | ||
797bcff5 TBA |
277 | void |
278 | sparc_target::low_arch_setup () | |
3aee8918 PA |
279 | { |
280 | current_process ()->tdesc = tdesc_sparc64; | |
281 | } | |
dfb64f85 | 282 | |
3aee8918 | 283 | static struct regset_info sparc_regsets[] = { |
1570b33e | 284 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
dfb64f85 DJ |
285 | GENERAL_REGS, |
286 | sparc_fill_gregset, sparc_store_gregset }, | |
1570b33e | 287 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t), |
dfb64f85 DJ |
288 | FP_REGS, |
289 | sparc_fill_fpregset, sparc_store_fpregset }, | |
50bc912a | 290 | NULL_REGSET |
dfb64f85 DJ |
291 | }; |
292 | ||
3aee8918 PA |
293 | static struct regsets_info sparc_regsets_info = |
294 | { | |
295 | sparc_regsets, /* regsets */ | |
296 | 0, /* num_regsets */ | |
297 | NULL, /* disabled_regsets */ | |
298 | }; | |
299 | ||
300 | static struct usrregs_info sparc_usrregs_info = | |
301 | { | |
302 | sparc_num_regs, | |
303 | /* No regmap needs to be provided since this impl. doesn't use | |
304 | USRREGS. */ | |
305 | NULL | |
306 | }; | |
307 | ||
aa8d21c9 | 308 | static struct regs_info myregs_info = |
3aee8918 PA |
309 | { |
310 | NULL, /* regset_bitmap */ | |
311 | &sparc_usrregs_info, | |
312 | &sparc_regsets_info | |
313 | }; | |
314 | ||
aa8d21c9 TBA |
315 | const regs_info * |
316 | sparc_target::get_regs_info () | |
3aee8918 | 317 | { |
aa8d21c9 | 318 | return &myregs_info; |
3aee8918 PA |
319 | } |
320 | ||
dfb64f85 | 321 | struct linux_target_ops the_low_target = { |
6f69e520 | 322 | linux_get_pc_64bit, |
dfb64f85 DJ |
323 | /* No sparc_set_pc is needed. */ |
324 | NULL, | |
dd373349 AT |
325 | NULL, /* breakpoint_kind_from_pc */ |
326 | sparc_sw_breakpoint_from_kind, | |
fa5308bd | 327 | NULL, /* get_next_pcs */ |
dfb64f85 DJ |
328 | 0, |
329 | sparc_breakpoint_at, | |
802e8e6d | 330 | NULL, /* supports_z_point_type */ |
dfb64f85 DJ |
331 | NULL, NULL, NULL, NULL, |
332 | NULL, NULL | |
333 | }; | |
3aee8918 | 334 | |
ef0478f6 TBA |
335 | /* The linux target ops object. */ |
336 | ||
337 | linux_process_target *the_linux_target = &the_sparc_target; | |
338 | ||
3aee8918 PA |
339 | void |
340 | initialize_low_arch (void) | |
341 | { | |
342 | /* Initialize the Linux target descriptions. */ | |
343 | init_registers_sparc64 (); | |
344 | ||
345 | initialize_regsets_info (&sparc_regsets_info); | |
346 | } |