Commit | Line | Data |
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d1180b0f MK |
1 | /* Target-dependent code for NetBSD/mips. |
2 | ||
6aba47ca | 3 | Copyright (C) 2002, 2003, 2004, 2006, 2007 Free Software Foundation, Inc. |
e4cd0d6a | 4 | |
45888261 JT |
5 | Contributed by Wasabi Systems, Inc. |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
197e01b6 EZ |
21 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
22 | Boston, MA 02110-1301, USA. */ | |
45888261 JT |
23 | |
24 | #include "defs.h" | |
25 | #include "gdbcore.h" | |
26 | #include "regcache.h" | |
d1180b0f | 27 | #include "regset.h" |
45888261 JT |
28 | #include "target.h" |
29 | #include "value.h" | |
30 | #include "osabi.h" | |
31 | ||
d1180b0f | 32 | #include "gdb_assert.h" |
4c7d22cb MK |
33 | #include "gdb_string.h" |
34 | ||
3d9b49b0 | 35 | #include "nbsd-tdep.h" |
45888261 | 36 | #include "mipsnbsd-tdep.h" |
1777c7b4 | 37 | #include "mips-tdep.h" |
45888261 JT |
38 | |
39 | #include "solib-svr4.h" | |
40 | ||
d1180b0f MK |
41 | /* Shorthand for some register numbers used below. */ |
42 | #define MIPS_PC_REGNUM MIPS_EMBED_PC_REGNUM | |
43 | #define MIPS_FP0_REGNUM MIPS_EMBED_FP0_REGNUM | |
44 | #define MIPS_FSR_REGNUM MIPS_EMBED_FP0_REGNUM + 32 | |
45 | ||
46 | /* Core file support. */ | |
47 | ||
48 | /* Number of registers in `struct reg' from <machine/reg.h>. */ | |
49 | #define MIPSNBSD_NUM_GREGS 38 | |
50 | ||
51 | /* Number of registers in `struct fpreg' from <machine/reg.h>. */ | |
52 | #define MIPSNBSD_NUM_FPREGS 33 | |
53 | ||
54 | /* Supply register REGNUM from the buffer specified by FPREGS and LEN | |
55 | in the floating-point register set REGSET to register cache | |
56 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
57 | ||
58 | static void | |
59 | mipsnbsd_supply_fpregset (const struct regset *regset, | |
60 | struct regcache *regcache, | |
61 | int regnum, const void *fpregs, size_t len) | |
62 | { | |
63 | size_t regsize = mips_isa_regsize (get_regcache_arch (regcache)); | |
64 | const char *regs = fpregs; | |
65 | int i; | |
66 | ||
67 | gdb_assert (len >= MIPSNBSD_NUM_FPREGS * regsize); | |
68 | ||
69 | for (i = MIPS_FP0_REGNUM; i <= MIPS_FSR_REGNUM; i++) | |
70 | { | |
71 | if (regnum == i || regnum == -1) | |
72 | regcache_raw_supply (regcache, i, | |
73 | regs + (i - MIPS_FP0_REGNUM) * regsize); | |
74 | } | |
75 | } | |
76 | ||
77 | /* Supply register REGNUM from the buffer specified by GREGS and LEN | |
78 | in the general-purpose register set REGSET to register cache | |
79 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
80 | ||
81 | static void | |
82 | mipsnbsd_supply_gregset (const struct regset *regset, | |
83 | struct regcache *regcache, int regnum, | |
84 | const void *gregs, size_t len) | |
85 | { | |
86 | size_t regsize = mips_isa_regsize (get_regcache_arch (regcache)); | |
87 | const char *regs = gregs; | |
88 | int i; | |
89 | ||
90 | gdb_assert (len >= MIPSNBSD_NUM_GREGS * regsize); | |
91 | ||
92 | for (i = 0; i <= MIPS_PC_REGNUM; i++) | |
93 | { | |
94 | if (regnum == i || regnum == -1) | |
95 | regcache_raw_supply (regcache, i, regs + i * regsize); | |
96 | } | |
97 | ||
98 | if (len >= (MIPSNBSD_NUM_GREGS + MIPSNBSD_NUM_FPREGS) * regsize) | |
99 | { | |
100 | regs += MIPSNBSD_NUM_GREGS * regsize; | |
101 | len -= MIPSNBSD_NUM_GREGS * regsize; | |
102 | mipsnbsd_supply_fpregset (regset, regcache, regnum, regs, len); | |
103 | } | |
104 | } | |
105 | ||
106 | /* NetBSD/mips register sets. */ | |
107 | ||
108 | static struct regset mipsnbsd_gregset = | |
109 | { | |
110 | NULL, | |
111 | mipsnbsd_supply_gregset | |
112 | }; | |
113 | ||
114 | static struct regset mipsnbsd_fpregset = | |
115 | { | |
116 | NULL, | |
117 | mipsnbsd_supply_fpregset | |
118 | }; | |
119 | ||
120 | /* Return the appropriate register set for the core section identified | |
121 | by SECT_NAME and SECT_SIZE. */ | |
122 | ||
123 | static const struct regset * | |
124 | mipsnbsd_regset_from_core_section (struct gdbarch *gdbarch, | |
125 | const char *sect_name, size_t sect_size) | |
126 | { | |
127 | size_t regsize = mips_isa_regsize (gdbarch); | |
128 | ||
129 | if (strcmp (sect_name, ".reg") == 0 | |
130 | && sect_size >= MIPSNBSD_NUM_GREGS * regsize) | |
131 | return &mipsnbsd_gregset; | |
132 | ||
133 | if (strcmp (sect_name, ".reg2") == 0 | |
134 | && sect_size >= MIPSNBSD_NUM_FPREGS * regsize) | |
135 | return &mipsnbsd_fpregset; | |
136 | ||
137 | return NULL; | |
138 | } | |
139 | \f | |
140 | ||
45888261 JT |
141 | /* Conveniently, GDB uses the same register numbering as the |
142 | ptrace register structure used by NetBSD/mips. */ | |
143 | ||
144 | void | |
28f5035f | 145 | mipsnbsd_supply_reg (struct regcache *regcache, const char *regs, int regno) |
45888261 JT |
146 | { |
147 | int i; | |
148 | ||
149 | for (i = 0; i <= PC_REGNUM; i++) | |
150 | { | |
151 | if (regno == i || regno == -1) | |
152 | { | |
8d4c1ba3 | 153 | if (gdbarch_cannot_fetch_register (current_gdbarch, i)) |
28f5035f | 154 | regcache_raw_supply (regcache, i, NULL); |
45888261 | 155 | else |
28f5035f | 156 | regcache_raw_supply (regcache, i, |
23a6d369 | 157 | regs + (i * mips_isa_regsize (current_gdbarch))); |
45888261 JT |
158 | } |
159 | } | |
160 | } | |
161 | ||
162 | void | |
28f5035f | 163 | mipsnbsd_fill_reg (const struct regcache *regcache, char *regs, int regno) |
45888261 JT |
164 | { |
165 | int i; | |
166 | ||
167 | for (i = 0; i <= PC_REGNUM; i++) | |
8d4c1ba3 UW |
168 | if ((regno == i || regno == -1) |
169 | && ! gdbarch_cannot_store_register (current_gdbarch, i)) | |
28f5035f | 170 | regcache_raw_collect (regcache, i, |
822c9732 | 171 | regs + (i * mips_isa_regsize (current_gdbarch))); |
45888261 JT |
172 | } |
173 | ||
174 | void | |
28f5035f | 175 | mipsnbsd_supply_fpreg (struct regcache *regcache, const char *fpregs, int regno) |
45888261 JT |
176 | { |
177 | int i; | |
178 | ||
56cea623 AC |
179 | for (i = FP0_REGNUM; |
180 | i <= mips_regnum (current_gdbarch)->fp_implementation_revision; | |
181 | i++) | |
45888261 JT |
182 | { |
183 | if (regno == i || regno == -1) | |
184 | { | |
8d4c1ba3 | 185 | if (gdbarch_cannot_fetch_register (current_gdbarch, i)) |
28f5035f | 186 | regcache_raw_supply (regcache, i, NULL); |
45888261 | 187 | else |
28f5035f | 188 | regcache_raw_supply (regcache, i, |
23a6d369 | 189 | fpregs + ((i - FP0_REGNUM) * mips_isa_regsize (current_gdbarch))); |
45888261 JT |
190 | } |
191 | } | |
192 | } | |
193 | ||
194 | void | |
28f5035f | 195 | mipsnbsd_fill_fpreg (const struct regcache *regcache, char *fpregs, int regno) |
45888261 JT |
196 | { |
197 | int i; | |
198 | ||
56cea623 AC |
199 | for (i = FP0_REGNUM; i <= mips_regnum (current_gdbarch)->fp_control_status; |
200 | i++) | |
8d4c1ba3 UW |
201 | if ((regno == i || regno == -1) |
202 | && ! gdbarch_cannot_store_register (current_gdbarch, i)) | |
28f5035f | 203 | regcache_raw_collect (regcache, i, |
822c9732 | 204 | fpregs + ((i - FP0_REGNUM) * mips_isa_regsize (current_gdbarch))); |
45888261 JT |
205 | } |
206 | ||
45888261 JT |
207 | /* Under NetBSD/mips, signal handler invocations can be identified by the |
208 | designated code sequence that is used to return from a signal handler. | |
209 | In particular, the return address of a signal handler points to the | |
210 | following code sequence: | |
211 | ||
212 | addu a0, sp, 16 | |
213 | li v0, 295 # __sigreturn14 | |
214 | syscall | |
215 | ||
216 | Each instruction has a unique encoding, so we simply attempt to match | |
217 | the instruction the PC is pointing to with any of the above instructions. | |
218 | If there is a hit, we know the offset to the start of the designated | |
219 | sequence and can then check whether we really are executing in the | |
220 | signal trampoline. If not, -1 is returned, otherwise the offset from the | |
221 | start of the return sequence is returned. */ | |
222 | ||
223 | #define RETCODE_NWORDS 3 | |
224 | #define RETCODE_SIZE (RETCODE_NWORDS * 4) | |
225 | ||
226 | static const unsigned char sigtramp_retcode_mipsel[RETCODE_SIZE] = | |
227 | { | |
228 | 0x10, 0x00, 0xa4, 0x27, /* addu a0, sp, 16 */ | |
229 | 0x27, 0x01, 0x02, 0x24, /* li v0, 295 */ | |
230 | 0x0c, 0x00, 0x00, 0x00, /* syscall */ | |
231 | }; | |
232 | ||
233 | static const unsigned char sigtramp_retcode_mipseb[RETCODE_SIZE] = | |
234 | { | |
235 | 0x27, 0xa4, 0x00, 0x10, /* addu a0, sp, 16 */ | |
236 | 0x24, 0x02, 0x01, 0x27, /* li v0, 295 */ | |
237 | 0x00, 0x00, 0x00, 0x0c, /* syscall */ | |
238 | }; | |
239 | ||
240 | static LONGEST | |
4c7d22cb | 241 | mipsnbsd_sigtramp_offset (struct frame_info *next_frame) |
45888261 | 242 | { |
4c7d22cb | 243 | CORE_ADDR pc = frame_pc_unwind (next_frame); |
4c6b5505 UW |
244 | const char *retcode = gdbarch_byte_order (current_gdbarch) |
245 | == BFD_ENDIAN_BIG ? sigtramp_retcode_mipseb : | |
246 | sigtramp_retcode_mipsel; | |
45888261 JT |
247 | unsigned char ret[RETCODE_SIZE], w[4]; |
248 | LONGEST off; | |
249 | int i; | |
250 | ||
4c7d22cb | 251 | if (!safe_frame_unwind_memory (next_frame, pc, w, sizeof (w))) |
45888261 JT |
252 | return -1; |
253 | ||
254 | for (i = 0; i < RETCODE_NWORDS; i++) | |
255 | { | |
256 | if (memcmp (w, retcode + (i * 4), 4) == 0) | |
257 | break; | |
258 | } | |
259 | if (i == RETCODE_NWORDS) | |
260 | return -1; | |
261 | ||
262 | off = i * 4; | |
263 | pc -= off; | |
264 | ||
4c7d22cb | 265 | if (!safe_frame_unwind_memory (next_frame, pc, ret, sizeof (ret))) |
45888261 JT |
266 | return -1; |
267 | ||
268 | if (memcmp (ret, retcode, RETCODE_SIZE) == 0) | |
269 | return off; | |
270 | ||
271 | return -1; | |
272 | } | |
273 | ||
45888261 | 274 | /* Figure out where the longjmp will land. We expect that we have |
4c7d22cb MK |
275 | just entered longjmp and haven't yet setup the stack frame, so the |
276 | args are still in the argument regs. MIPS_A0_REGNUM points at the | |
45888261 JT |
277 | jmp_buf structure from which we extract the PC that we will land |
278 | at. The PC is copied into *pc. This routine returns true on | |
279 | success. */ | |
280 | ||
281 | #define NBSD_MIPS_JB_PC (2 * 4) | |
1b13c4f6 | 282 | #define NBSD_MIPS_JB_ELEMENT_SIZE mips_isa_regsize (current_gdbarch) |
45888261 JT |
283 | #define NBSD_MIPS_JB_OFFSET (NBSD_MIPS_JB_PC * \ |
284 | NBSD_MIPS_JB_ELEMENT_SIZE) | |
285 | ||
286 | static int | |
287 | mipsnbsd_get_longjmp_target (CORE_ADDR *pc) | |
288 | { | |
289 | CORE_ADDR jb_addr; | |
290 | char *buf; | |
291 | ||
292 | buf = alloca (NBSD_MIPS_JB_ELEMENT_SIZE); | |
293 | ||
4c7d22cb | 294 | jb_addr = read_register (MIPS_A0_REGNUM); |
45888261 JT |
295 | |
296 | if (target_read_memory (jb_addr + NBSD_MIPS_JB_OFFSET, buf, | |
297 | NBSD_MIPS_JB_ELEMENT_SIZE)) | |
298 | return 0; | |
299 | ||
7c0b4a20 | 300 | *pc = extract_unsigned_integer (buf, NBSD_MIPS_JB_ELEMENT_SIZE); |
45888261 JT |
301 | |
302 | return 1; | |
303 | } | |
304 | ||
305 | static int | |
306 | mipsnbsd_cannot_fetch_register (int regno) | |
307 | { | |
4c7d22cb | 308 | return (regno == MIPS_ZERO_REGNUM |
56cea623 | 309 | || regno == mips_regnum (current_gdbarch)->fp_implementation_revision); |
45888261 JT |
310 | } |
311 | ||
312 | static int | |
313 | mipsnbsd_cannot_store_register (int regno) | |
314 | { | |
4c7d22cb | 315 | return (regno == MIPS_ZERO_REGNUM |
56cea623 | 316 | || regno == mips_regnum (current_gdbarch)->fp_implementation_revision); |
45888261 JT |
317 | } |
318 | ||
fabe86c8 MK |
319 | /* Shared library support. */ |
320 | ||
321 | /* NetBSD/mips uses a slightly different `struct link_map' than the | |
45888261 | 322 | other NetBSD platforms. */ |
fabe86c8 | 323 | |
45888261 | 324 | static struct link_map_offsets * |
fabe86c8 | 325 | mipsnbsd_ilp32_fetch_link_map_offsets (void) |
45888261 JT |
326 | { |
327 | static struct link_map_offsets lmo; | |
328 | static struct link_map_offsets *lmp = NULL; | |
329 | ||
330 | if (lmp == NULL) | |
331 | { | |
332 | lmp = &lmo; | |
333 | ||
e4cd0d6a MK |
334 | lmo.r_version_offset = 0; |
335 | lmo.r_version_size = 4; | |
45888261 | 336 | lmo.r_map_offset = 4; |
e4cd0d6a | 337 | lmo.r_ldsomap_offset = -1; |
45888261 | 338 | |
fabe86c8 | 339 | /* Everything we need is in the first 24 bytes. */ |
45888261 | 340 | lmo.link_map_size = 24; |
4c7d22cb | 341 | lmo.l_addr_offset = 4; |
45888261 | 342 | lmo.l_name_offset = 8; |
cc10cae3 | 343 | lmo.l_ld_offset = 12; |
45888261 | 344 | lmo.l_next_offset = 16; |
45888261 | 345 | lmo.l_prev_offset = 20; |
45888261 JT |
346 | } |
347 | ||
348 | return lmp; | |
349 | } | |
350 | ||
351 | static struct link_map_offsets * | |
fabe86c8 | 352 | mipsnbsd_lp64_fetch_link_map_offsets (void) |
45888261 JT |
353 | { |
354 | static struct link_map_offsets lmo; | |
355 | static struct link_map_offsets *lmp = NULL; | |
356 | ||
357 | if (lmp == NULL) | |
358 | { | |
359 | lmp = &lmo; | |
360 | ||
e4cd0d6a MK |
361 | lmo.r_version_offset = 0; |
362 | lmo.r_version_size = 4; | |
363 | lmo.r_map_offset = 8; | |
364 | lmo.r_ldsomap_offset = -1; | |
45888261 | 365 | |
fabe86c8 | 366 | /* Everything we need is in the first 40 bytes. */ |
45888261 | 367 | lmo.link_map_size = 48; |
45888261 | 368 | lmo.l_addr_offset = 0; |
45888261 | 369 | lmo.l_name_offset = 16; |
cc10cae3 | 370 | lmo.l_ld_offset = 24; |
45888261 | 371 | lmo.l_next_offset = 32; |
45888261 | 372 | lmo.l_prev_offset = 40; |
45888261 JT |
373 | } |
374 | ||
375 | return lmp; | |
376 | } | |
fabe86c8 | 377 | \f |
45888261 JT |
378 | |
379 | static void | |
380 | mipsnbsd_init_abi (struct gdbarch_info info, | |
381 | struct gdbarch *gdbarch) | |
382 | { | |
d1180b0f MK |
383 | set_gdbarch_regset_from_core_section |
384 | (gdbarch, mipsnbsd_regset_from_core_section); | |
385 | ||
45888261 JT |
386 | set_gdbarch_get_longjmp_target (gdbarch, mipsnbsd_get_longjmp_target); |
387 | ||
388 | set_gdbarch_cannot_fetch_register (gdbarch, mipsnbsd_cannot_fetch_register); | |
389 | set_gdbarch_cannot_store_register (gdbarch, mipsnbsd_cannot_store_register); | |
390 | ||
391 | set_gdbarch_software_single_step (gdbarch, mips_software_single_step); | |
392 | ||
fabe86c8 MK |
393 | /* NetBSD/mips has SVR4-style shared libraries. */ |
394 | set_solib_svr4_fetch_link_map_offsets | |
395 | (gdbarch, (gdbarch_ptr_bit (gdbarch) == 32 ? | |
396 | mipsnbsd_ilp32_fetch_link_map_offsets : | |
397 | mipsnbsd_lp64_fetch_link_map_offsets)); | |
45888261 | 398 | } |
d1180b0f MK |
399 | \f |
400 | ||
401 | static enum gdb_osabi | |
402 | mipsnbsd_core_osabi_sniffer (bfd *abfd) | |
403 | { | |
404 | if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) | |
405 | return GDB_OSABI_NETBSD_ELF; | |
406 | ||
407 | return GDB_OSABI_UNKNOWN; | |
408 | } | |
45888261 JT |
409 | |
410 | void | |
411 | _initialize_mipsnbsd_tdep (void) | |
412 | { | |
05816f70 | 413 | gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_NETBSD_ELF, |
45888261 | 414 | mipsnbsd_init_abi); |
45888261 | 415 | } |