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0a30fbc4 | 1 | /* GNU/Linux/MIPS specific low level interface, for the remote server for GDB. |
6aba47ca | 2 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2005, 2006, 2007 |
0a30fbc4 DJ |
3 | Free Software Foundation, Inc. |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
6f0f660e EZ |
19 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. */ | |
0a30fbc4 DJ |
21 | |
22 | #include "server.h" | |
58caa3dc | 23 | #include "linux-low.h" |
0a30fbc4 | 24 | |
21b0f40c | 25 | #include <sys/ptrace.h> |
186947f7 | 26 | #include <endian.h> |
21b0f40c DJ |
27 | |
28 | #include "gdb_proc_service.h" | |
29 | ||
30 | #ifndef PTRACE_GET_THREAD_AREA | |
31 | #define PTRACE_GET_THREAD_AREA 25 | |
32 | #endif | |
33 | ||
0a30fbc4 DJ |
34 | #ifdef HAVE_SYS_REG_H |
35 | #include <sys/reg.h> | |
36 | #endif | |
37 | ||
117ce543 | 38 | #define mips_num_regs 73 |
0a30fbc4 DJ |
39 | |
40 | #include <asm/ptrace.h> | |
41 | ||
186947f7 DJ |
42 | union mips_register |
43 | { | |
44 | unsigned char buf[8]; | |
45 | ||
46 | /* Deliberately signed, for proper sign extension. */ | |
47 | int reg32; | |
48 | long long reg64; | |
49 | }; | |
50 | ||
0a30fbc4 DJ |
51 | /* Return the ptrace ``address'' of register REGNO. */ |
52 | ||
2ec06d2e | 53 | static int mips_regmap[] = { |
117ce543 | 54 | -1, 1, 2, 3, 4, 5, 6, 7, |
0a30fbc4 DJ |
55 | 8, 9, 10, 11, 12, 13, 14, 15, |
56 | 16, 17, 18, 19, 20, 21, 22, 23, | |
57 | 24, 25, 26, 27, 28, 29, 30, 31, | |
58 | ||
59 | -1, MMLO, MMHI, BADVADDR, CAUSE, PC, | |
60 | ||
61 | FPR_BASE, FPR_BASE + 1, FPR_BASE + 2, FPR_BASE + 3, | |
62 | FPR_BASE + 4, FPR_BASE + 5, FPR_BASE + 6, FPR_BASE + 7, | |
63 | FPR_BASE + 8, FPR_BASE + 8, FPR_BASE + 10, FPR_BASE + 11, | |
64 | FPR_BASE + 12, FPR_BASE + 13, FPR_BASE + 14, FPR_BASE + 15, | |
65 | FPR_BASE + 16, FPR_BASE + 17, FPR_BASE + 18, FPR_BASE + 19, | |
66 | FPR_BASE + 20, FPR_BASE + 21, FPR_BASE + 22, FPR_BASE + 23, | |
67 | FPR_BASE + 24, FPR_BASE + 25, FPR_BASE + 26, FPR_BASE + 27, | |
68 | FPR_BASE + 28, FPR_BASE + 29, FPR_BASE + 30, FPR_BASE + 31, | |
69 | FPC_CSR, FPC_EIR, | |
70 | ||
117ce543 | 71 | 0 |
0a30fbc4 DJ |
72 | }; |
73 | ||
74 | /* From mips-linux-nat.c. */ | |
75 | ||
76 | /* Pseudo registers can not be read. ptrace does not provide a way to | |
77 | read (or set) PS_REGNUM, and there's no point in reading or setting | |
78 | ZERO_REGNUM. We also can not set BADVADDR, CAUSE, or FCRIR via | |
79 | ptrace(). */ | |
80 | ||
2ec06d2e DJ |
81 | static int |
82 | mips_cannot_fetch_register (int regno) | |
0a30fbc4 | 83 | { |
2ec06d2e | 84 | if (mips_regmap[regno] == -1) |
0a30fbc4 DJ |
85 | return 1; |
86 | ||
117ce543 | 87 | if (find_regno ("r0") == regno) |
0a30fbc4 DJ |
88 | return 1; |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
2ec06d2e DJ |
93 | static int |
94 | mips_cannot_store_register (int regno) | |
0a30fbc4 | 95 | { |
2ec06d2e | 96 | if (mips_regmap[regno] == -1) |
0a30fbc4 DJ |
97 | return 1; |
98 | ||
117ce543 | 99 | if (find_regno ("r0") == regno) |
0a30fbc4 DJ |
100 | return 1; |
101 | ||
1d33e73a | 102 | if (find_regno ("cause") == regno) |
0a30fbc4 DJ |
103 | return 1; |
104 | ||
117ce543 | 105 | if (find_regno ("badvaddr") == regno) |
0a30fbc4 DJ |
106 | return 1; |
107 | ||
1d33e73a | 108 | if (find_regno ("fir") == regno) |
0a30fbc4 DJ |
109 | return 1; |
110 | ||
111 | return 0; | |
112 | } | |
2ec06d2e | 113 | |
0d62e5e8 DJ |
114 | static CORE_ADDR |
115 | mips_get_pc () | |
116 | { | |
186947f7 DJ |
117 | union mips_register pc; |
118 | collect_register_by_name ("pc", pc.buf); | |
119 | return register_size (0) == 4 ? pc.reg32 : pc.reg64; | |
0d62e5e8 DJ |
120 | } |
121 | ||
122 | static void | |
123 | mips_set_pc (CORE_ADDR pc) | |
124 | { | |
186947f7 DJ |
125 | union mips_register newpc; |
126 | if (register_size (0) == 4) | |
127 | newpc.reg32 = pc; | |
128 | else | |
129 | newpc.reg64 = pc; | |
130 | ||
131 | supply_register_by_name ("pc", newpc.buf); | |
0d62e5e8 DJ |
132 | } |
133 | ||
134 | /* Correct in either endianness. */ | |
186947f7 | 135 | static const unsigned int mips_breakpoint = 0x0005000d; |
0d62e5e8 DJ |
136 | #define mips_breakpoint_len 4 |
137 | ||
138 | /* We only place breakpoints in empty marker functions, and thread locking | |
139 | is outside of the function. So rather than importing software single-step, | |
140 | we can just run until exit. */ | |
141 | static CORE_ADDR | |
142 | mips_reinsert_addr () | |
143 | { | |
186947f7 | 144 | union mips_register ra; |
117ce543 | 145 | collect_register_by_name ("r31", ra.buf); |
186947f7 | 146 | return register_size (0) == 4 ? ra.reg32 : ra.reg64; |
0d62e5e8 DJ |
147 | } |
148 | ||
149 | static int | |
150 | mips_breakpoint_at (CORE_ADDR where) | |
151 | { | |
186947f7 | 152 | unsigned int insn; |
0d62e5e8 | 153 | |
f450004a | 154 | (*the_target->read_memory) (where, (unsigned char *) &insn, 4); |
0d62e5e8 DJ |
155 | if (insn == mips_breakpoint) |
156 | return 1; | |
157 | ||
158 | /* If necessary, recognize more trap instructions here. GDB only uses the | |
159 | one. */ | |
160 | return 0; | |
161 | } | |
162 | ||
21b0f40c DJ |
163 | /* Fetch the thread-local storage pointer for libthread_db. */ |
164 | ||
165 | ps_err_e | |
166 | ps_get_thread_area (const struct ps_prochandle *ph, | |
167 | lwpid_t lwpid, int idx, void **base) | |
168 | { | |
169 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) | |
170 | return PS_ERR; | |
171 | ||
172 | /* IDX is the bias from the thread pointer to the beginning of the | |
173 | thread descriptor. It has to be subtracted due to implementation | |
174 | quirks in libthread_db. */ | |
175 | *base = (void *) ((char *)*base - idx); | |
176 | ||
177 | return PS_OK; | |
178 | } | |
179 | ||
186947f7 DJ |
180 | #ifdef HAVE_PTRACE_GETREGS |
181 | ||
182 | static void | |
183 | mips_collect_register (int use_64bit, int regno, union mips_register *reg) | |
184 | { | |
185 | union mips_register tmp_reg; | |
186 | ||
187 | if (use_64bit) | |
188 | { | |
189 | collect_register (regno, &tmp_reg.reg64); | |
190 | *reg = tmp_reg; | |
191 | } | |
192 | else | |
193 | { | |
194 | collect_register (regno, &tmp_reg.reg32); | |
195 | reg->reg64 = tmp_reg.reg32; | |
196 | } | |
197 | } | |
198 | ||
199 | static void | |
200 | mips_supply_register (int use_64bit, int regno, const union mips_register *reg) | |
201 | { | |
202 | int offset = 0; | |
203 | ||
204 | /* For big-endian 32-bit targets, ignore the high four bytes of each | |
205 | eight-byte slot. */ | |
206 | if (__BYTE_ORDER == __BIG_ENDIAN && !use_64bit) | |
207 | offset = 4; | |
208 | ||
209 | supply_register (regno, reg->buf + offset); | |
210 | } | |
211 | ||
212 | static void | |
213 | mips_collect_register_32bit (int use_64bit, int regno, unsigned char *buf) | |
214 | { | |
215 | union mips_register tmp_reg; | |
216 | int reg32; | |
217 | ||
218 | mips_collect_register (use_64bit, regno, &tmp_reg); | |
219 | reg32 = tmp_reg.reg64; | |
220 | memcpy (buf, ®32, 4); | |
221 | } | |
222 | ||
223 | static void | |
224 | mips_supply_register_32bit (int use_64bit, int regno, const unsigned char *buf) | |
225 | { | |
226 | union mips_register tmp_reg; | |
227 | int reg32; | |
228 | ||
229 | memcpy (®32, buf, 4); | |
230 | tmp_reg.reg64 = reg32; | |
231 | mips_supply_register (use_64bit, regno, &tmp_reg); | |
232 | } | |
233 | ||
234 | static void | |
235 | mips_fill_gregset (void *buf) | |
236 | { | |
237 | union mips_register *regset = buf; | |
238 | int i, use_64bit; | |
239 | ||
240 | use_64bit = (register_size (0) == 8); | |
241 | ||
117ce543 | 242 | for (i = 1; i < 32; i++) |
186947f7 DJ |
243 | mips_collect_register (use_64bit, i, regset + i); |
244 | ||
245 | mips_collect_register (use_64bit, find_regno ("lo"), regset + 32); | |
246 | mips_collect_register (use_64bit, find_regno ("hi"), regset + 33); | |
247 | mips_collect_register (use_64bit, find_regno ("pc"), regset + 34); | |
117ce543 DJ |
248 | mips_collect_register (use_64bit, find_regno ("badvaddr"), regset + 35); |
249 | mips_collect_register (use_64bit, find_regno ("status"), regset + 36); | |
186947f7 | 250 | mips_collect_register (use_64bit, find_regno ("cause"), regset + 37); |
117ce543 DJ |
251 | |
252 | mips_collect_register (use_64bit, find_regno ("restart"), regset + 0); | |
186947f7 DJ |
253 | } |
254 | ||
255 | static void | |
256 | mips_store_gregset (const void *buf) | |
257 | { | |
258 | const union mips_register *regset = buf; | |
259 | int i, use_64bit; | |
260 | ||
261 | use_64bit = (register_size (0) == 8); | |
262 | ||
263 | for (i = 0; i < 32; i++) | |
264 | mips_supply_register (use_64bit, i, regset + i); | |
265 | ||
266 | mips_supply_register (use_64bit, find_regno ("lo"), regset + 32); | |
267 | mips_supply_register (use_64bit, find_regno ("hi"), regset + 33); | |
268 | mips_supply_register (use_64bit, find_regno ("pc"), regset + 34); | |
117ce543 DJ |
269 | mips_supply_register (use_64bit, find_regno ("badvaddr"), regset + 35); |
270 | mips_supply_register (use_64bit, find_regno ("status"), regset + 36); | |
186947f7 | 271 | mips_supply_register (use_64bit, find_regno ("cause"), regset + 37); |
117ce543 DJ |
272 | |
273 | mips_supply_register (use_64bit, find_regno ("restart"), regset + 0); | |
186947f7 DJ |
274 | } |
275 | ||
276 | static void | |
277 | mips_fill_fpregset (void *buf) | |
278 | { | |
279 | union mips_register *regset = buf; | |
280 | int i, use_64bit, first_fp, big_endian; | |
281 | ||
282 | use_64bit = (register_size (0) == 8); | |
283 | first_fp = find_regno ("f0"); | |
284 | big_endian = (__BYTE_ORDER == __BIG_ENDIAN); | |
285 | ||
286 | /* See GDB for a discussion of this peculiar layout. */ | |
287 | for (i = 0; i < 32; i++) | |
288 | if (use_64bit) | |
289 | collect_register (first_fp + i, regset[i].buf); | |
290 | else | |
291 | collect_register (first_fp + i, | |
292 | regset[i & ~1].buf + 4 * (big_endian != (i & 1))); | |
293 | ||
117ce543 | 294 | mips_collect_register_32bit (use_64bit, find_regno ("fcsr"), regset[32].buf); |
186947f7 DJ |
295 | mips_collect_register_32bit (use_64bit, find_regno ("fir"), |
296 | regset[32].buf + 4); | |
297 | } | |
298 | ||
299 | static void | |
300 | mips_store_fpregset (const void *buf) | |
301 | { | |
302 | const union mips_register *regset = buf; | |
303 | int i, use_64bit, first_fp, big_endian; | |
304 | ||
305 | use_64bit = (register_size (0) == 8); | |
306 | first_fp = find_regno ("f0"); | |
307 | big_endian = (__BYTE_ORDER == __BIG_ENDIAN); | |
308 | ||
309 | /* See GDB for a discussion of this peculiar layout. */ | |
310 | for (i = 0; i < 32; i++) | |
311 | if (use_64bit) | |
312 | supply_register (first_fp + i, regset[i].buf); | |
313 | else | |
314 | supply_register (first_fp + i, | |
315 | regset[i & ~1].buf + 4 * (big_endian != (i & 1))); | |
316 | ||
117ce543 | 317 | mips_supply_register_32bit (use_64bit, find_regno ("fcsr"), regset[32].buf); |
186947f7 DJ |
318 | mips_supply_register_32bit (use_64bit, find_regno ("fir"), |
319 | regset[32].buf + 4); | |
320 | } | |
321 | #endif /* HAVE_PTRACE_GETREGS */ | |
322 | ||
323 | struct regset_info target_regsets[] = { | |
324 | #ifdef HAVE_PTRACE_GETREGS | |
325 | { PTRACE_GETREGS, PTRACE_SETREGS, 38 * 8, GENERAL_REGS, | |
326 | mips_fill_gregset, mips_store_gregset }, | |
327 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 33 * 8, FP_REGS, | |
328 | mips_fill_fpregset, mips_store_fpregset }, | |
329 | #endif /* HAVE_PTRACE_GETREGS */ | |
330 | { 0, 0, -1, -1, NULL, NULL } | |
331 | }; | |
332 | ||
2ec06d2e DJ |
333 | struct linux_target_ops the_low_target = { |
334 | mips_num_regs, | |
335 | mips_regmap, | |
336 | mips_cannot_fetch_register, | |
337 | mips_cannot_store_register, | |
0d62e5e8 DJ |
338 | mips_get_pc, |
339 | mips_set_pc, | |
f450004a | 340 | (const unsigned char *) &mips_breakpoint, |
0d62e5e8 DJ |
341 | mips_breakpoint_len, |
342 | mips_reinsert_addr, | |
343 | 0, | |
344 | mips_breakpoint_at, | |
2ec06d2e | 345 | }; |