Commit | Line | Data |
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d1180b0f MK |
1 | /* Target-dependent code for NetBSD/mips. |
2 | ||
0fb0cc75 | 3 | Copyright (C) 2002, 2003, 2004, 2006, 2007, 2008, 2009 |
9b254dd1 | 4 | Free Software Foundation, Inc. |
e4cd0d6a | 5 | |
45888261 JT |
6 | Contributed by Wasabi Systems, Inc. |
7 | ||
8 | This file is part of GDB. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 12 | the Free Software Foundation; either version 3 of the License, or |
45888261 JT |
13 | (at your option) any later version. |
14 | ||
15 | This program is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
45888261 JT |
22 | |
23 | #include "defs.h" | |
24 | #include "gdbcore.h" | |
25 | #include "regcache.h" | |
d1180b0f | 26 | #include "regset.h" |
45888261 JT |
27 | #include "target.h" |
28 | #include "value.h" | |
29 | #include "osabi.h" | |
30 | ||
d1180b0f | 31 | #include "gdb_assert.h" |
4c7d22cb MK |
32 | #include "gdb_string.h" |
33 | ||
3d9b49b0 | 34 | #include "nbsd-tdep.h" |
45888261 | 35 | #include "mipsnbsd-tdep.h" |
1777c7b4 | 36 | #include "mips-tdep.h" |
45888261 JT |
37 | |
38 | #include "solib-svr4.h" | |
39 | ||
d1180b0f MK |
40 | /* Shorthand for some register numbers used below. */ |
41 | #define MIPS_PC_REGNUM MIPS_EMBED_PC_REGNUM | |
42 | #define MIPS_FP0_REGNUM MIPS_EMBED_FP0_REGNUM | |
43 | #define MIPS_FSR_REGNUM MIPS_EMBED_FP0_REGNUM + 32 | |
44 | ||
45 | /* Core file support. */ | |
46 | ||
47 | /* Number of registers in `struct reg' from <machine/reg.h>. */ | |
48 | #define MIPSNBSD_NUM_GREGS 38 | |
49 | ||
50 | /* Number of registers in `struct fpreg' from <machine/reg.h>. */ | |
51 | #define MIPSNBSD_NUM_FPREGS 33 | |
52 | ||
53 | /* Supply register REGNUM from the buffer specified by FPREGS and LEN | |
54 | in the floating-point register set REGSET to register cache | |
55 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
56 | ||
57 | static void | |
58 | mipsnbsd_supply_fpregset (const struct regset *regset, | |
59 | struct regcache *regcache, | |
60 | int regnum, const void *fpregs, size_t len) | |
61 | { | |
62 | size_t regsize = mips_isa_regsize (get_regcache_arch (regcache)); | |
63 | const char *regs = fpregs; | |
64 | int i; | |
65 | ||
66 | gdb_assert (len >= MIPSNBSD_NUM_FPREGS * regsize); | |
67 | ||
68 | for (i = MIPS_FP0_REGNUM; i <= MIPS_FSR_REGNUM; i++) | |
69 | { | |
70 | if (regnum == i || regnum == -1) | |
71 | regcache_raw_supply (regcache, i, | |
72 | regs + (i - MIPS_FP0_REGNUM) * regsize); | |
73 | } | |
74 | } | |
75 | ||
76 | /* Supply register REGNUM from the buffer specified by GREGS and LEN | |
77 | in the general-purpose register set REGSET to register cache | |
78 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
79 | ||
80 | static void | |
81 | mipsnbsd_supply_gregset (const struct regset *regset, | |
82 | struct regcache *regcache, int regnum, | |
83 | const void *gregs, size_t len) | |
84 | { | |
85 | size_t regsize = mips_isa_regsize (get_regcache_arch (regcache)); | |
86 | const char *regs = gregs; | |
87 | int i; | |
88 | ||
89 | gdb_assert (len >= MIPSNBSD_NUM_GREGS * regsize); | |
90 | ||
91 | for (i = 0; i <= MIPS_PC_REGNUM; i++) | |
92 | { | |
93 | if (regnum == i || regnum == -1) | |
94 | regcache_raw_supply (regcache, i, regs + i * regsize); | |
95 | } | |
96 | ||
97 | if (len >= (MIPSNBSD_NUM_GREGS + MIPSNBSD_NUM_FPREGS) * regsize) | |
98 | { | |
99 | regs += MIPSNBSD_NUM_GREGS * regsize; | |
100 | len -= MIPSNBSD_NUM_GREGS * regsize; | |
101 | mipsnbsd_supply_fpregset (regset, regcache, regnum, regs, len); | |
102 | } | |
103 | } | |
104 | ||
105 | /* NetBSD/mips register sets. */ | |
106 | ||
107 | static struct regset mipsnbsd_gregset = | |
108 | { | |
109 | NULL, | |
110 | mipsnbsd_supply_gregset | |
111 | }; | |
112 | ||
113 | static struct regset mipsnbsd_fpregset = | |
114 | { | |
115 | NULL, | |
116 | mipsnbsd_supply_fpregset | |
117 | }; | |
118 | ||
119 | /* Return the appropriate register set for the core section identified | |
120 | by SECT_NAME and SECT_SIZE. */ | |
121 | ||
122 | static const struct regset * | |
123 | mipsnbsd_regset_from_core_section (struct gdbarch *gdbarch, | |
124 | const char *sect_name, size_t sect_size) | |
125 | { | |
126 | size_t regsize = mips_isa_regsize (gdbarch); | |
127 | ||
128 | if (strcmp (sect_name, ".reg") == 0 | |
129 | && sect_size >= MIPSNBSD_NUM_GREGS * regsize) | |
130 | return &mipsnbsd_gregset; | |
131 | ||
132 | if (strcmp (sect_name, ".reg2") == 0 | |
133 | && sect_size >= MIPSNBSD_NUM_FPREGS * regsize) | |
134 | return &mipsnbsd_fpregset; | |
135 | ||
136 | return NULL; | |
137 | } | |
138 | \f | |
139 | ||
45888261 JT |
140 | /* Conveniently, GDB uses the same register numbering as the |
141 | ptrace register structure used by NetBSD/mips. */ | |
142 | ||
143 | void | |
28f5035f | 144 | mipsnbsd_supply_reg (struct regcache *regcache, const char *regs, int regno) |
45888261 | 145 | { |
2eb4d78b | 146 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
45888261 JT |
147 | int i; |
148 | ||
2eb4d78b | 149 | for (i = 0; i <= gdbarch_pc_regnum (gdbarch); i++) |
45888261 JT |
150 | { |
151 | if (regno == i || regno == -1) | |
152 | { | |
2eb4d78b | 153 | if (gdbarch_cannot_fetch_register (gdbarch, i)) |
28f5035f | 154 | regcache_raw_supply (regcache, i, NULL); |
45888261 | 155 | else |
28f5035f | 156 | regcache_raw_supply (regcache, i, |
2eb4d78b | 157 | regs + (i * mips_isa_regsize (gdbarch))); |
45888261 JT |
158 | } |
159 | } | |
160 | } | |
161 | ||
162 | void | |
28f5035f | 163 | mipsnbsd_fill_reg (const struct regcache *regcache, char *regs, int regno) |
45888261 | 164 | { |
2eb4d78b | 165 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
45888261 JT |
166 | int i; |
167 | ||
2eb4d78b | 168 | for (i = 0; i <= gdbarch_pc_regnum (gdbarch); i++) |
8d4c1ba3 | 169 | if ((regno == i || regno == -1) |
2eb4d78b | 170 | && ! gdbarch_cannot_store_register (gdbarch, i)) |
28f5035f | 171 | regcache_raw_collect (regcache, i, |
2eb4d78b | 172 | regs + (i * mips_isa_regsize (gdbarch))); |
45888261 JT |
173 | } |
174 | ||
175 | void | |
28f5035f | 176 | mipsnbsd_supply_fpreg (struct regcache *regcache, const char *fpregs, int regno) |
45888261 | 177 | { |
2eb4d78b | 178 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
45888261 JT |
179 | int i; |
180 | ||
2eb4d78b UW |
181 | for (i = gdbarch_fp0_regnum (gdbarch); |
182 | i <= mips_regnum (gdbarch)->fp_implementation_revision; | |
56cea623 | 183 | i++) |
45888261 JT |
184 | { |
185 | if (regno == i || regno == -1) | |
186 | { | |
2eb4d78b | 187 | if (gdbarch_cannot_fetch_register (gdbarch, i)) |
28f5035f | 188 | regcache_raw_supply (regcache, i, NULL); |
45888261 | 189 | else |
28f5035f | 190 | regcache_raw_supply (regcache, i, |
3e8c568d | 191 | fpregs |
2eb4d78b UW |
192 | + ((i - gdbarch_fp0_regnum (gdbarch)) |
193 | * mips_isa_regsize (gdbarch))); | |
45888261 JT |
194 | } |
195 | } | |
196 | } | |
197 | ||
198 | void | |
28f5035f | 199 | mipsnbsd_fill_fpreg (const struct regcache *regcache, char *fpregs, int regno) |
45888261 | 200 | { |
2eb4d78b | 201 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
45888261 JT |
202 | int i; |
203 | ||
2eb4d78b UW |
204 | for (i = gdbarch_fp0_regnum (gdbarch); |
205 | i <= mips_regnum (gdbarch)->fp_control_status; | |
56cea623 | 206 | i++) |
8d4c1ba3 | 207 | if ((regno == i || regno == -1) |
2eb4d78b | 208 | && ! gdbarch_cannot_store_register (gdbarch, i)) |
28f5035f | 209 | regcache_raw_collect (regcache, i, |
2eb4d78b UW |
210 | fpregs + ((i - gdbarch_fp0_regnum (gdbarch)) |
211 | * mips_isa_regsize (gdbarch))); | |
45888261 JT |
212 | } |
213 | ||
45888261 JT |
214 | /* Under NetBSD/mips, signal handler invocations can be identified by the |
215 | designated code sequence that is used to return from a signal handler. | |
216 | In particular, the return address of a signal handler points to the | |
217 | following code sequence: | |
218 | ||
219 | addu a0, sp, 16 | |
220 | li v0, 295 # __sigreturn14 | |
221 | syscall | |
222 | ||
223 | Each instruction has a unique encoding, so we simply attempt to match | |
224 | the instruction the PC is pointing to with any of the above instructions. | |
225 | If there is a hit, we know the offset to the start of the designated | |
226 | sequence and can then check whether we really are executing in the | |
227 | signal trampoline. If not, -1 is returned, otherwise the offset from the | |
228 | start of the return sequence is returned. */ | |
229 | ||
230 | #define RETCODE_NWORDS 3 | |
231 | #define RETCODE_SIZE (RETCODE_NWORDS * 4) | |
232 | ||
233 | static const unsigned char sigtramp_retcode_mipsel[RETCODE_SIZE] = | |
234 | { | |
235 | 0x10, 0x00, 0xa4, 0x27, /* addu a0, sp, 16 */ | |
236 | 0x27, 0x01, 0x02, 0x24, /* li v0, 295 */ | |
237 | 0x0c, 0x00, 0x00, 0x00, /* syscall */ | |
238 | }; | |
239 | ||
240 | static const unsigned char sigtramp_retcode_mipseb[RETCODE_SIZE] = | |
241 | { | |
242 | 0x27, 0xa4, 0x00, 0x10, /* addu a0, sp, 16 */ | |
243 | 0x24, 0x02, 0x01, 0x27, /* li v0, 295 */ | |
244 | 0x00, 0x00, 0x00, 0x0c, /* syscall */ | |
245 | }; | |
246 | ||
247 | static LONGEST | |
b8a22b94 | 248 | mipsnbsd_sigtramp_offset (struct frame_info *this_frame) |
45888261 | 249 | { |
b8a22b94 DJ |
250 | CORE_ADDR pc = get_frame_pc (this_frame); |
251 | const char *retcode = gdbarch_byte_order (get_frame_arch (this_frame)) | |
4c6b5505 UW |
252 | == BFD_ENDIAN_BIG ? sigtramp_retcode_mipseb : |
253 | sigtramp_retcode_mipsel; | |
45888261 JT |
254 | unsigned char ret[RETCODE_SIZE], w[4]; |
255 | LONGEST off; | |
256 | int i; | |
257 | ||
b8a22b94 | 258 | if (!safe_frame_unwind_memory (this_frame, pc, w, sizeof (w))) |
45888261 JT |
259 | return -1; |
260 | ||
261 | for (i = 0; i < RETCODE_NWORDS; i++) | |
262 | { | |
263 | if (memcmp (w, retcode + (i * 4), 4) == 0) | |
264 | break; | |
265 | } | |
266 | if (i == RETCODE_NWORDS) | |
267 | return -1; | |
268 | ||
269 | off = i * 4; | |
270 | pc -= off; | |
271 | ||
b8a22b94 | 272 | if (!safe_frame_unwind_memory (this_frame, pc, ret, sizeof (ret))) |
45888261 JT |
273 | return -1; |
274 | ||
275 | if (memcmp (ret, retcode, RETCODE_SIZE) == 0) | |
276 | return off; | |
277 | ||
278 | return -1; | |
279 | } | |
280 | ||
45888261 | 281 | /* Figure out where the longjmp will land. We expect that we have |
4c7d22cb MK |
282 | just entered longjmp and haven't yet setup the stack frame, so the |
283 | args are still in the argument regs. MIPS_A0_REGNUM points at the | |
45888261 JT |
284 | jmp_buf structure from which we extract the PC that we will land |
285 | at. The PC is copied into *pc. This routine returns true on | |
286 | success. */ | |
287 | ||
288 | #define NBSD_MIPS_JB_PC (2 * 4) | |
74ed0bb4 MD |
289 | #define NBSD_MIPS_JB_ELEMENT_SIZE(gdbarch) mips_isa_regsize (gdbarch) |
290 | #define NBSD_MIPS_JB_OFFSET(gdbarch) (NBSD_MIPS_JB_PC * \ | |
291 | NBSD_MIPS_JB_ELEMENT_SIZE (gdbarch)) | |
45888261 JT |
292 | |
293 | static int | |
60ade65d | 294 | mipsnbsd_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
45888261 | 295 | { |
74ed0bb4 | 296 | struct gdbarch *gdbarch = get_frame_arch (frame); |
45888261 JT |
297 | CORE_ADDR jb_addr; |
298 | char *buf; | |
299 | ||
74ed0bb4 | 300 | buf = alloca (NBSD_MIPS_JB_ELEMENT_SIZE (gdbarch)); |
45888261 | 301 | |
60ade65d | 302 | jb_addr = get_frame_register_unsigned (frame, MIPS_A0_REGNUM); |
45888261 | 303 | |
74ed0bb4 MD |
304 | if (target_read_memory (jb_addr + NBSD_MIPS_JB_OFFSET (gdbarch), buf, |
305 | NBSD_MIPS_JB_ELEMENT_SIZE (gdbarch))) | |
45888261 JT |
306 | return 0; |
307 | ||
74ed0bb4 | 308 | *pc = extract_unsigned_integer (buf, NBSD_MIPS_JB_ELEMENT_SIZE (gdbarch)); |
45888261 JT |
309 | |
310 | return 1; | |
311 | } | |
312 | ||
313 | static int | |
64a3914f | 314 | mipsnbsd_cannot_fetch_register (struct gdbarch *gdbarch, int regno) |
45888261 | 315 | { |
4c7d22cb | 316 | return (regno == MIPS_ZERO_REGNUM |
64a3914f | 317 | || regno == mips_regnum (gdbarch)->fp_implementation_revision); |
45888261 JT |
318 | } |
319 | ||
320 | static int | |
64a3914f | 321 | mipsnbsd_cannot_store_register (struct gdbarch *gdbarch, int regno) |
45888261 | 322 | { |
4c7d22cb | 323 | return (regno == MIPS_ZERO_REGNUM |
64a3914f | 324 | || regno == mips_regnum (gdbarch)->fp_implementation_revision); |
45888261 JT |
325 | } |
326 | ||
fabe86c8 MK |
327 | /* Shared library support. */ |
328 | ||
329 | /* NetBSD/mips uses a slightly different `struct link_map' than the | |
45888261 | 330 | other NetBSD platforms. */ |
fabe86c8 | 331 | |
45888261 | 332 | static struct link_map_offsets * |
fabe86c8 | 333 | mipsnbsd_ilp32_fetch_link_map_offsets (void) |
45888261 JT |
334 | { |
335 | static struct link_map_offsets lmo; | |
336 | static struct link_map_offsets *lmp = NULL; | |
337 | ||
338 | if (lmp == NULL) | |
339 | { | |
340 | lmp = &lmo; | |
341 | ||
e4cd0d6a MK |
342 | lmo.r_version_offset = 0; |
343 | lmo.r_version_size = 4; | |
45888261 | 344 | lmo.r_map_offset = 4; |
7cd25cfc | 345 | lmo.r_brk_offset = 8; |
e4cd0d6a | 346 | lmo.r_ldsomap_offset = -1; |
45888261 | 347 | |
fabe86c8 | 348 | /* Everything we need is in the first 24 bytes. */ |
45888261 | 349 | lmo.link_map_size = 24; |
4c7d22cb | 350 | lmo.l_addr_offset = 4; |
45888261 | 351 | lmo.l_name_offset = 8; |
cc10cae3 | 352 | lmo.l_ld_offset = 12; |
45888261 | 353 | lmo.l_next_offset = 16; |
45888261 | 354 | lmo.l_prev_offset = 20; |
45888261 JT |
355 | } |
356 | ||
357 | return lmp; | |
358 | } | |
359 | ||
360 | static struct link_map_offsets * | |
fabe86c8 | 361 | mipsnbsd_lp64_fetch_link_map_offsets (void) |
45888261 JT |
362 | { |
363 | static struct link_map_offsets lmo; | |
364 | static struct link_map_offsets *lmp = NULL; | |
365 | ||
366 | if (lmp == NULL) | |
367 | { | |
368 | lmp = &lmo; | |
369 | ||
e4cd0d6a MK |
370 | lmo.r_version_offset = 0; |
371 | lmo.r_version_size = 4; | |
372 | lmo.r_map_offset = 8; | |
7cd25cfc | 373 | lmo.r_brk_offset = 16; |
e4cd0d6a | 374 | lmo.r_ldsomap_offset = -1; |
45888261 | 375 | |
fabe86c8 | 376 | /* Everything we need is in the first 40 bytes. */ |
45888261 | 377 | lmo.link_map_size = 48; |
45888261 | 378 | lmo.l_addr_offset = 0; |
45888261 | 379 | lmo.l_name_offset = 16; |
cc10cae3 | 380 | lmo.l_ld_offset = 24; |
45888261 | 381 | lmo.l_next_offset = 32; |
45888261 | 382 | lmo.l_prev_offset = 40; |
45888261 JT |
383 | } |
384 | ||
385 | return lmp; | |
386 | } | |
fabe86c8 | 387 | \f |
45888261 JT |
388 | |
389 | static void | |
390 | mipsnbsd_init_abi (struct gdbarch_info info, | |
391 | struct gdbarch *gdbarch) | |
392 | { | |
d1180b0f MK |
393 | set_gdbarch_regset_from_core_section |
394 | (gdbarch, mipsnbsd_regset_from_core_section); | |
395 | ||
45888261 JT |
396 | set_gdbarch_get_longjmp_target (gdbarch, mipsnbsd_get_longjmp_target); |
397 | ||
398 | set_gdbarch_cannot_fetch_register (gdbarch, mipsnbsd_cannot_fetch_register); | |
399 | set_gdbarch_cannot_store_register (gdbarch, mipsnbsd_cannot_store_register); | |
400 | ||
401 | set_gdbarch_software_single_step (gdbarch, mips_software_single_step); | |
402 | ||
fabe86c8 MK |
403 | /* NetBSD/mips has SVR4-style shared libraries. */ |
404 | set_solib_svr4_fetch_link_map_offsets | |
405 | (gdbarch, (gdbarch_ptr_bit (gdbarch) == 32 ? | |
406 | mipsnbsd_ilp32_fetch_link_map_offsets : | |
407 | mipsnbsd_lp64_fetch_link_map_offsets)); | |
45888261 | 408 | } |
d1180b0f MK |
409 | \f |
410 | ||
411 | static enum gdb_osabi | |
412 | mipsnbsd_core_osabi_sniffer (bfd *abfd) | |
413 | { | |
414 | if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) | |
415 | return GDB_OSABI_NETBSD_ELF; | |
416 | ||
417 | return GDB_OSABI_UNKNOWN; | |
418 | } | |
45888261 | 419 | |
63807e1d PA |
420 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
421 | extern initialize_file_ftype _initialize_mipsnbsd_tdep; | |
422 | ||
45888261 JT |
423 | void |
424 | _initialize_mipsnbsd_tdep (void) | |
425 | { | |
05816f70 | 426 | gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_NETBSD_ELF, |
45888261 | 427 | mipsnbsd_init_abi); |
45888261 | 428 | } |