2007-10-10 Markus Deuling <deuling@de.ibm.com>
[deliverable/binutils-gdb.git] / gdb / mips-linux-nat.c
1 /* Native-dependent code for GNU/Linux on MIPS processors.
2
3 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
4 Free Software Foundation, Inc.
5
6 This file is part of GDB.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20
21 #include "defs.h"
22 #include "inferior.h"
23 #include "mips-tdep.h"
24 #include "target.h"
25 #include "regcache.h"
26 #include "linux-nat.h"
27 #include "mips-linux-tdep.h"
28 #include "target-descriptions.h"
29 #include "xml-support.h"
30
31 #include "gdb_proc_service.h"
32 #include "gregset.h"
33
34 #include <sgidefs.h>
35 #include <sys/ptrace.h>
36
37 #ifndef PTRACE_GET_THREAD_AREA
38 #define PTRACE_GET_THREAD_AREA 25
39 #endif
40
41 /* Assume that we have PTRACE_GETREGS et al. support. If we do not,
42 we'll clear this and use PTRACE_PEEKUSER instead. */
43 static int have_ptrace_regsets = 1;
44
45 /* Saved function pointers to fetch and store a single register using
46 PTRACE_PEEKUSER and PTRACE_POKEUSER. */
47
48 void (*super_fetch_registers) (struct regcache *, int);
49 void (*super_store_registers) (struct regcache *, int);
50
51 /* Map gdb internal register number to ptrace ``address''.
52 These ``addresses'' are normally defined in <asm/ptrace.h>.
53
54 ptrace does not provide a way to read (or set) MIPS_PS_REGNUM,
55 and there's no point in reading or setting MIPS_ZERO_REGNUM.
56 We also can not set BADVADDR, CAUSE, or FCRIR via ptrace(). */
57
58 static CORE_ADDR
59 mips_linux_register_addr (struct gdbarch *gdbarch, int regno, int store)
60 {
61 CORE_ADDR regaddr;
62
63 if (regno < 0 || regno >= gdbarch_num_regs (gdbarch))
64 error (_("Bogon register number %d."), regno);
65
66 if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
67 regaddr = regno;
68 else if ((regno >= mips_regnum (gdbarch)->fp0)
69 && (regno < mips_regnum (gdbarch)->fp0 + 32))
70 regaddr = FPR_BASE + (regno - mips_regnum (gdbarch)->fp0);
71 else if (regno == mips_regnum (gdbarch)->pc)
72 regaddr = PC;
73 else if (regno == mips_regnum (gdbarch)->cause)
74 regaddr = store? (CORE_ADDR) -1 : CAUSE;
75 else if (regno == mips_regnum (gdbarch)->badvaddr)
76 regaddr = store? (CORE_ADDR) -1 : BADVADDR;
77 else if (regno == mips_regnum (gdbarch)->lo)
78 regaddr = MMLO;
79 else if (regno == mips_regnum (gdbarch)->hi)
80 regaddr = MMHI;
81 else if (regno == mips_regnum (gdbarch)->fp_control_status)
82 regaddr = FPC_CSR;
83 else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
84 regaddr = store? (CORE_ADDR) -1 : FPC_EIR;
85 else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM)
86 regaddr = 0;
87 else
88 regaddr = (CORE_ADDR) -1;
89
90 return regaddr;
91 }
92
93 static CORE_ADDR
94 mips64_linux_register_addr (struct gdbarch *gdbarch, int regno, int store)
95 {
96 CORE_ADDR regaddr;
97
98 if (regno < 0 || regno >= gdbarch_num_regs (gdbarch))
99 error (_("Bogon register number %d."), regno);
100
101 if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
102 regaddr = regno;
103 else if ((regno >= mips_regnum (gdbarch)->fp0)
104 && (regno < mips_regnum (gdbarch)->fp0 + 32))
105 regaddr = MIPS64_FPR_BASE + (regno - gdbarch_fp0_regnum (gdbarch));
106 else if (regno == mips_regnum (gdbarch)->pc)
107 regaddr = MIPS64_PC;
108 else if (regno == mips_regnum (gdbarch)->cause)
109 regaddr = store? (CORE_ADDR) -1 : MIPS64_CAUSE;
110 else if (regno == mips_regnum (gdbarch)->badvaddr)
111 regaddr = store? (CORE_ADDR) -1 : MIPS64_BADVADDR;
112 else if (regno == mips_regnum (gdbarch)->lo)
113 regaddr = MIPS64_MMLO;
114 else if (regno == mips_regnum (gdbarch)->hi)
115 regaddr = MIPS64_MMHI;
116 else if (regno == mips_regnum (gdbarch)->fp_control_status)
117 regaddr = MIPS64_FPC_CSR;
118 else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
119 regaddr = store? (CORE_ADDR) -1 : MIPS64_FPC_EIR;
120 else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM)
121 regaddr = 0;
122 else
123 regaddr = (CORE_ADDR) -1;
124
125 return regaddr;
126 }
127
128 /* Fetch the thread-local storage pointer for libthread_db. */
129
130 ps_err_e
131 ps_get_thread_area (const struct ps_prochandle *ph,
132 lwpid_t lwpid, int idx, void **base)
133 {
134 if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
135 return PS_ERR;
136
137 /* IDX is the bias from the thread pointer to the beginning of the
138 thread descriptor. It has to be subtracted due to implementation
139 quirks in libthread_db. */
140 *base = (void *) ((char *)*base - idx);
141
142 return PS_OK;
143 }
144
145 /* Wrapper functions. These are only used by libthread_db. */
146
147 void
148 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
149 {
150 if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
151 mips_supply_gregset (regcache, (const mips_elf_gregset_t *) gregsetp);
152 else
153 mips64_supply_gregset (regcache, (const mips64_elf_gregset_t *) gregsetp);
154 }
155
156 void
157 fill_gregset (const struct regcache *regcache,
158 gdb_gregset_t *gregsetp, int regno)
159 {
160 if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
161 mips_fill_gregset (regcache, (mips_elf_gregset_t *) gregsetp, regno);
162 else
163 mips64_fill_gregset (regcache, (mips64_elf_gregset_t *) gregsetp, regno);
164 }
165
166 void
167 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
168 {
169 if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
170 mips_supply_fpregset (regcache, (const mips_elf_fpregset_t *) fpregsetp);
171 else
172 mips64_supply_fpregset (regcache, (const mips64_elf_fpregset_t *) fpregsetp);
173 }
174
175 void
176 fill_fpregset (const struct regcache *regcache,
177 gdb_fpregset_t *fpregsetp, int regno)
178 {
179 if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
180 mips_fill_fpregset (regcache, (mips_elf_fpregset_t *) fpregsetp, regno);
181 else
182 mips64_fill_fpregset (regcache, (mips64_elf_fpregset_t *) fpregsetp, regno);
183 }
184
185
186 /* Fetch REGNO (or all registers if REGNO == -1) from the target
187 using PTRACE_GETREGS et al. */
188
189 static void
190 mips64_linux_regsets_fetch_registers (struct regcache *regcache, int regno)
191 {
192 struct gdbarch *gdbarch = get_regcache_arch (regcache);
193 int is_fp;
194 int tid;
195
196 if (regno >= mips_regnum (gdbarch)->fp0
197 && regno <= mips_regnum (gdbarch)->fp0 + 32)
198 is_fp = 1;
199 else if (regno == mips_regnum (gdbarch)->fp_control_status)
200 is_fp = 1;
201 else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
202 is_fp = 1;
203 else
204 is_fp = 0;
205
206 tid = ptid_get_lwp (inferior_ptid);
207 if (tid == 0)
208 tid = ptid_get_pid (inferior_ptid);
209
210 if (regno == -1 || !is_fp)
211 {
212 mips64_elf_gregset_t regs;
213
214 if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) &regs) == -1)
215 {
216 if (errno == EIO)
217 {
218 have_ptrace_regsets = 0;
219 return;
220 }
221 perror_with_name (_("Couldn't get registers"));
222 }
223
224 mips64_supply_gregset (regcache,
225 (const mips64_elf_gregset_t *) &regs);
226 }
227
228 if (regno == -1 || is_fp)
229 {
230 mips64_elf_fpregset_t fp_regs;
231
232 if (ptrace (PTRACE_GETFPREGS, tid, 0L,
233 (PTRACE_TYPE_ARG3) &fp_regs) == -1)
234 {
235 if (errno == EIO)
236 {
237 have_ptrace_regsets = 0;
238 return;
239 }
240 perror_with_name (_("Couldn't get FP registers"));
241 }
242
243 mips64_supply_fpregset (regcache,
244 (const mips64_elf_fpregset_t *) &fp_regs);
245 }
246 }
247
248 /* Store REGNO (or all registers if REGNO == -1) to the target
249 using PTRACE_SETREGS et al. */
250
251 static void
252 mips64_linux_regsets_store_registers (const struct regcache *regcache, int regno)
253 {
254 struct gdbarch *gdbarch = get_regcache_arch (regcache);
255 int is_fp;
256 int tid;
257
258 if (regno >= mips_regnum (gdbarch)->fp0
259 && regno <= mips_regnum (gdbarch)->fp0 + 32)
260 is_fp = 1;
261 else if (regno == mips_regnum (gdbarch)->fp_control_status)
262 is_fp = 1;
263 else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
264 is_fp = 1;
265 else
266 is_fp = 0;
267
268 tid = ptid_get_lwp (inferior_ptid);
269 if (tid == 0)
270 tid = ptid_get_pid (inferior_ptid);
271
272 if (regno == -1 || !is_fp)
273 {
274 mips64_elf_gregset_t regs;
275
276 if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) &regs) == -1)
277 perror_with_name (_("Couldn't get registers"));
278
279 mips64_fill_gregset (regcache, &regs, regno);
280
281 if (ptrace (PTRACE_SETREGS, tid, 0L, (PTRACE_TYPE_ARG3) &regs) == -1)
282 perror_with_name (_("Couldn't set registers"));
283 }
284
285 if (regno == -1 || is_fp)
286 {
287 mips64_elf_fpregset_t fp_regs;
288
289 if (ptrace (PTRACE_GETFPREGS, tid, 0L,
290 (PTRACE_TYPE_ARG3) &fp_regs) == -1)
291 perror_with_name (_("Couldn't get FP registers"));
292
293 mips64_fill_fpregset (regcache, &fp_regs, regno);
294
295 if (ptrace (PTRACE_SETFPREGS, tid, 0L,
296 (PTRACE_TYPE_ARG3) &fp_regs) == -1)
297 perror_with_name (_("Couldn't set FP registers"));
298 }
299 }
300
301 /* Fetch REGNO (or all registers if REGNO == -1) from the target
302 using any working method. */
303
304 static void
305 mips64_linux_fetch_registers (struct regcache *regcache, int regnum)
306 {
307 /* Unless we already know that PTRACE_GETREGS does not work, try it. */
308 if (have_ptrace_regsets)
309 mips64_linux_regsets_fetch_registers (regcache, regnum);
310
311 /* If we know, or just found out, that PTRACE_GETREGS does not work, fall
312 back to PTRACE_PEEKUSER. */
313 if (!have_ptrace_regsets)
314 super_fetch_registers (regcache, regnum);
315 }
316
317 /* Store REGNO (or all registers if REGNO == -1) to the target
318 using any working method. */
319
320 static void
321 mips64_linux_store_registers (struct regcache *regcache, int regnum)
322 {
323 /* Unless we already know that PTRACE_GETREGS does not work, try it. */
324 if (have_ptrace_regsets)
325 mips64_linux_regsets_store_registers (regcache, regnum);
326
327 /* If we know, or just found out, that PTRACE_GETREGS does not work, fall
328 back to PTRACE_PEEKUSER. */
329 if (!have_ptrace_regsets)
330 super_store_registers (regcache, regnum);
331 }
332
333 /* Return the address in the core dump or inferior of register
334 REGNO. */
335
336 static CORE_ADDR
337 mips_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p)
338 {
339 if (mips_abi_regsize (gdbarch) == 8)
340 return mips64_linux_register_addr (gdbarch, regno, store_p);
341 else
342 return mips_linux_register_addr (gdbarch, regno, store_p);
343 }
344
345 static LONGEST (*super_xfer_partial) (struct target_ops *, enum target_object,
346 const char *, gdb_byte *, const gdb_byte *,
347 ULONGEST, LONGEST);
348
349 static LONGEST
350 mips_linux_xfer_partial (struct target_ops *ops,
351 enum target_object object,
352 const char *annex,
353 gdb_byte *readbuf, const gdb_byte *writebuf,
354 ULONGEST offset, LONGEST len)
355 {
356 if (object == TARGET_OBJECT_AVAILABLE_FEATURES)
357 {
358 if (annex != NULL && strcmp (annex, "target.xml") == 0)
359 {
360 /* Report that target registers are a size we know for sure
361 that we can get from ptrace. */
362 if (_MIPS_SIM == _ABIO32)
363 annex = "mips-linux.xml";
364 else
365 annex = "mips64-linux.xml";
366 }
367
368 return xml_builtin_xfer_partial (annex, readbuf, writebuf, offset, len);
369 }
370
371 return super_xfer_partial (ops, object, annex, readbuf, writebuf,
372 offset, len);
373 }
374
375 void _initialize_mips_linux_nat (void);
376
377 void
378 _initialize_mips_linux_nat (void)
379 {
380 struct target_ops *t = linux_trad_target (mips_linux_register_u_offset);
381
382 super_fetch_registers = t->to_fetch_registers;
383 super_store_registers = t->to_store_registers;
384
385 t->to_fetch_registers = mips64_linux_fetch_registers;
386 t->to_store_registers = mips64_linux_store_registers;
387
388 /* Override the default to_xfer_partial. */
389 super_xfer_partial = t->to_xfer_partial;
390 t->to_xfer_partial = mips_linux_xfer_partial;
391
392 linux_nat_add_target (t);
393 }
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