1 /* GNU/Linux/MIPS specific low level interface, for the remote server for GDB.
2 Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2005, 2006, 2007
3 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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
19 Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
23 #include "linux-low.h"
25 #include <sys/ptrace.h>
28 #include "gdb_proc_service.h"
30 #ifndef PTRACE_GET_THREAD_AREA
31 #define PTRACE_GET_THREAD_AREA 25
38 #define mips_num_regs 73
40 #include <asm/ptrace.h>
46 /* Deliberately signed, for proper sign extension. */
51 /* Return the ptrace ``address'' of register REGNO. */
53 static int mips_regmap
[] = {
54 -1, 1, 2, 3, 4, 5, 6, 7,
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,
59 -1, MMLO
, MMHI
, BADVADDR
, CAUSE
, PC
,
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,
74 /* From mips-linux-nat.c. */
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
82 mips_cannot_fetch_register (int regno
)
84 if (mips_regmap
[regno
] == -1)
87 if (find_regno ("r0") == regno
)
94 mips_cannot_store_register (int regno
)
96 if (mips_regmap
[regno
] == -1)
99 if (find_regno ("r0") == regno
)
102 if (find_regno ("cause") == regno
)
105 if (find_regno ("badvaddr") == regno
)
108 if (find_regno ("fir") == regno
)
117 union mips_register pc
;
118 collect_register_by_name ("pc", pc
.buf
);
119 return register_size (0) == 4 ? pc
.reg32
: pc
.reg64
;
123 mips_set_pc (CORE_ADDR pc
)
125 union mips_register newpc
;
126 if (register_size (0) == 4)
131 supply_register_by_name ("pc", newpc
.buf
);
134 /* Correct in either endianness. */
135 static const unsigned int mips_breakpoint
= 0x0005000d;
136 #define mips_breakpoint_len 4
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. */
142 mips_reinsert_addr ()
144 union mips_register ra
;
145 collect_register_by_name ("r31", ra
.buf
);
146 return register_size (0) == 4 ? ra
.reg32
: ra
.reg64
;
150 mips_breakpoint_at (CORE_ADDR where
)
154 (*the_target
->read_memory
) (where
, (unsigned char *) &insn
, 4);
155 if (insn
== mips_breakpoint
)
158 /* If necessary, recognize more trap instructions here. GDB only uses the
163 /* Fetch the thread-local storage pointer for libthread_db. */
166 ps_get_thread_area (const struct ps_prochandle
*ph
,
167 lwpid_t lwpid
, int idx
, void **base
)
169 if (ptrace (PTRACE_GET_THREAD_AREA
, lwpid
, NULL
, base
) != 0)
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
);
180 #ifdef HAVE_PTRACE_GETREGS
183 mips_collect_register (int use_64bit
, int regno
, union mips_register
*reg
)
185 union mips_register tmp_reg
;
189 collect_register (regno
, &tmp_reg
.reg64
);
194 collect_register (regno
, &tmp_reg
.reg32
);
195 reg
->reg64
= tmp_reg
.reg32
;
200 mips_supply_register (int use_64bit
, int regno
, const union mips_register
*reg
)
204 /* For big-endian 32-bit targets, ignore the high four bytes of each
206 if (__BYTE_ORDER
== __BIG_ENDIAN
&& !use_64bit
)
209 supply_register (regno
, reg
->buf
+ offset
);
213 mips_collect_register_32bit (int use_64bit
, int regno
, unsigned char *buf
)
215 union mips_register tmp_reg
;
218 mips_collect_register (use_64bit
, regno
, &tmp_reg
);
219 reg32
= tmp_reg
.reg64
;
220 memcpy (buf
, ®32
, 4);
224 mips_supply_register_32bit (int use_64bit
, int regno
, const unsigned char *buf
)
226 union mips_register tmp_reg
;
229 memcpy (®32
, buf
, 4);
230 tmp_reg
.reg64
= reg32
;
231 mips_supply_register (use_64bit
, regno
, &tmp_reg
);
235 mips_fill_gregset (void *buf
)
237 union mips_register
*regset
= buf
;
240 use_64bit
= (register_size (0) == 8);
242 for (i
= 1; i
< 32; i
++)
243 mips_collect_register (use_64bit
, i
, regset
+ i
);
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);
248 mips_collect_register (use_64bit
, find_regno ("badvaddr"), regset
+ 35);
249 mips_collect_register (use_64bit
, find_regno ("status"), regset
+ 36);
250 mips_collect_register (use_64bit
, find_regno ("cause"), regset
+ 37);
252 mips_collect_register (use_64bit
, find_regno ("restart"), regset
+ 0);
256 mips_store_gregset (const void *buf
)
258 const union mips_register
*regset
= buf
;
261 use_64bit
= (register_size (0) == 8);
263 for (i
= 0; i
< 32; i
++)
264 mips_supply_register (use_64bit
, i
, regset
+ i
);
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);
269 mips_supply_register (use_64bit
, find_regno ("badvaddr"), regset
+ 35);
270 mips_supply_register (use_64bit
, find_regno ("status"), regset
+ 36);
271 mips_supply_register (use_64bit
, find_regno ("cause"), regset
+ 37);
273 mips_supply_register (use_64bit
, find_regno ("restart"), regset
+ 0);
277 mips_fill_fpregset (void *buf
)
279 union mips_register
*regset
= buf
;
280 int i
, use_64bit
, first_fp
, big_endian
;
282 use_64bit
= (register_size (0) == 8);
283 first_fp
= find_regno ("f0");
284 big_endian
= (__BYTE_ORDER
== __BIG_ENDIAN
);
286 /* See GDB for a discussion of this peculiar layout. */
287 for (i
= 0; i
< 32; i
++)
289 collect_register (first_fp
+ i
, regset
[i
].buf
);
291 collect_register (first_fp
+ i
,
292 regset
[i
& ~1].buf
+ 4 * (big_endian
!= (i
& 1)));
294 mips_collect_register_32bit (use_64bit
, find_regno ("fcsr"), regset
[32].buf
);
295 mips_collect_register_32bit (use_64bit
, find_regno ("fir"),
300 mips_store_fpregset (const void *buf
)
302 const union mips_register
*regset
= buf
;
303 int i
, use_64bit
, first_fp
, big_endian
;
305 use_64bit
= (register_size (0) == 8);
306 first_fp
= find_regno ("f0");
307 big_endian
= (__BYTE_ORDER
== __BIG_ENDIAN
);
309 /* See GDB for a discussion of this peculiar layout. */
310 for (i
= 0; i
< 32; i
++)
312 supply_register (first_fp
+ i
, regset
[i
].buf
);
314 supply_register (first_fp
+ i
,
315 regset
[i
& ~1].buf
+ 4 * (big_endian
!= (i
& 1)));
317 mips_supply_register_32bit (use_64bit
, find_regno ("fcsr"), regset
[32].buf
);
318 mips_supply_register_32bit (use_64bit
, find_regno ("fir"),
321 #endif /* HAVE_PTRACE_GETREGS */
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
}
333 struct linux_target_ops the_low_target
= {
336 mips_cannot_fetch_register
,
337 mips_cannot_store_register
,
340 (const unsigned char *) &mips_breakpoint
,