1 /* Target-dependent code for NetBSD/mips.
3 Copyright 2002, 2003, 2004 Free Software Foundation, Inc.
4 Contributed by Wasabi Systems, Inc.
6 This file is part of GDB.
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 2 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
31 #include "gdb_assert.h"
32 #include "gdb_string.h"
34 #include "nbsd-tdep.h"
35 #include "mipsnbsd-tdep.h"
36 #include "mips-tdep.h"
38 #include "solib-svr4.h"
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
45 /* Core file support. */
47 /* Number of registers in `struct reg' from <machine/reg.h>. */
48 #define MIPSNBSD_NUM_GREGS 38
50 /* Number of registers in `struct fpreg' from <machine/reg.h>. */
51 #define MIPSNBSD_NUM_FPREGS 33
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. */
58 mipsnbsd_supply_fpregset (const struct regset
*regset
,
59 struct regcache
*regcache
,
60 int regnum
, const void *fpregs
, size_t len
)
62 size_t regsize
= mips_isa_regsize (get_regcache_arch (regcache
));
63 const char *regs
= fpregs
;
66 gdb_assert (len
>= MIPSNBSD_NUM_FPREGS
* regsize
);
68 for (i
= MIPS_FP0_REGNUM
; i
<= MIPS_FSR_REGNUM
; i
++)
70 if (regnum
== i
|| regnum
== -1)
71 regcache_raw_supply (regcache
, i
,
72 regs
+ (i
- MIPS_FP0_REGNUM
) * regsize
);
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. */
81 mipsnbsd_supply_gregset (const struct regset
*regset
,
82 struct regcache
*regcache
, int regnum
,
83 const void *gregs
, size_t len
)
85 size_t regsize
= mips_isa_regsize (get_regcache_arch (regcache
));
86 const char *regs
= gregs
;
89 gdb_assert (len
>= MIPSNBSD_NUM_GREGS
* regsize
);
91 for (i
= 0; i
<= MIPS_PC_REGNUM
; i
++)
93 if (regnum
== i
|| regnum
== -1)
94 regcache_raw_supply (regcache
, i
, regs
+ i
* regsize
);
97 if (len
>= (MIPSNBSD_NUM_GREGS
+ MIPSNBSD_NUM_FPREGS
) * regsize
)
99 regs
+= MIPSNBSD_NUM_GREGS
* regsize
;
100 len
-= MIPSNBSD_NUM_GREGS
* regsize
;
101 mipsnbsd_supply_fpregset (regset
, regcache
, regnum
, regs
, len
);
105 /* NetBSD/mips register sets. */
107 static struct regset mipsnbsd_gregset
=
110 mipsnbsd_supply_gregset
113 static struct regset mipsnbsd_fpregset
=
116 mipsnbsd_supply_fpregset
119 /* Return the appropriate register set for the core section identified
120 by SECT_NAME and SECT_SIZE. */
122 static const struct regset
*
123 mipsnbsd_regset_from_core_section (struct gdbarch
*gdbarch
,
124 const char *sect_name
, size_t sect_size
)
126 size_t regsize
= mips_isa_regsize (gdbarch
);
128 if (strcmp (sect_name
, ".reg") == 0
129 && sect_size
>= MIPSNBSD_NUM_GREGS
* regsize
)
130 return &mipsnbsd_gregset
;
132 if (strcmp (sect_name
, ".reg2") == 0
133 && sect_size
>= MIPSNBSD_NUM_FPREGS
* regsize
)
134 return &mipsnbsd_fpregset
;
140 /* Conveniently, GDB uses the same register numbering as the
141 ptrace register structure used by NetBSD/mips. */
144 mipsnbsd_supply_reg (char *regs
, int regno
)
148 for (i
= 0; i
<= PC_REGNUM
; i
++)
150 if (regno
== i
|| regno
== -1)
152 if (CANNOT_FETCH_REGISTER (i
))
153 regcache_raw_supply (current_regcache
, i
, NULL
);
155 regcache_raw_supply (current_regcache
, i
,
156 regs
+ (i
* mips_isa_regsize (current_gdbarch
)));
162 mipsnbsd_fill_reg (char *regs
, int regno
)
166 for (i
= 0; i
<= PC_REGNUM
; i
++)
167 if ((regno
== i
|| regno
== -1) && ! CANNOT_STORE_REGISTER (i
))
168 regcache_raw_collect (current_regcache
, i
,
169 regs
+ (i
* mips_isa_regsize (current_gdbarch
)));
173 mipsnbsd_supply_fpreg (char *fpregs
, int regno
)
178 i
<= mips_regnum (current_gdbarch
)->fp_implementation_revision
;
181 if (regno
== i
|| regno
== -1)
183 if (CANNOT_FETCH_REGISTER (i
))
184 regcache_raw_supply (current_regcache
, i
, NULL
);
186 regcache_raw_supply (current_regcache
, i
,
187 fpregs
+ ((i
- FP0_REGNUM
) * mips_isa_regsize (current_gdbarch
)));
193 mipsnbsd_fill_fpreg (char *fpregs
, int regno
)
197 for (i
= FP0_REGNUM
; i
<= mips_regnum (current_gdbarch
)->fp_control_status
;
199 if ((regno
== i
|| regno
== -1) && ! CANNOT_STORE_REGISTER (i
))
200 regcache_raw_collect (current_regcache
, i
,
201 fpregs
+ ((i
- FP0_REGNUM
) * mips_isa_regsize (current_gdbarch
)));
204 /* Under NetBSD/mips, signal handler invocations can be identified by the
205 designated code sequence that is used to return from a signal handler.
206 In particular, the return address of a signal handler points to the
207 following code sequence:
210 li v0, 295 # __sigreturn14
213 Each instruction has a unique encoding, so we simply attempt to match
214 the instruction the PC is pointing to with any of the above instructions.
215 If there is a hit, we know the offset to the start of the designated
216 sequence and can then check whether we really are executing in the
217 signal trampoline. If not, -1 is returned, otherwise the offset from the
218 start of the return sequence is returned. */
220 #define RETCODE_NWORDS 3
221 #define RETCODE_SIZE (RETCODE_NWORDS * 4)
223 static const unsigned char sigtramp_retcode_mipsel
[RETCODE_SIZE
] =
225 0x10, 0x00, 0xa4, 0x27, /* addu a0, sp, 16 */
226 0x27, 0x01, 0x02, 0x24, /* li v0, 295 */
227 0x0c, 0x00, 0x00, 0x00, /* syscall */
230 static const unsigned char sigtramp_retcode_mipseb
[RETCODE_SIZE
] =
232 0x27, 0xa4, 0x00, 0x10, /* addu a0, sp, 16 */
233 0x24, 0x02, 0x01, 0x27, /* li v0, 295 */
234 0x00, 0x00, 0x00, 0x0c, /* syscall */
238 mipsnbsd_sigtramp_offset (struct frame_info
*next_frame
)
240 CORE_ADDR pc
= frame_pc_unwind (next_frame
);
241 const char *retcode
= TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
242 ? sigtramp_retcode_mipseb
: sigtramp_retcode_mipsel
;
243 unsigned char ret
[RETCODE_SIZE
], w
[4];
247 if (!safe_frame_unwind_memory (next_frame
, pc
, w
, sizeof (w
)))
250 for (i
= 0; i
< RETCODE_NWORDS
; i
++)
252 if (memcmp (w
, retcode
+ (i
* 4), 4) == 0)
255 if (i
== RETCODE_NWORDS
)
261 if (!safe_frame_unwind_memory (next_frame
, pc
, ret
, sizeof (ret
)))
264 if (memcmp (ret
, retcode
, RETCODE_SIZE
) == 0)
270 /* Figure out where the longjmp will land. We expect that we have
271 just entered longjmp and haven't yet setup the stack frame, so the
272 args are still in the argument regs. MIPS_A0_REGNUM points at the
273 jmp_buf structure from which we extract the PC that we will land
274 at. The PC is copied into *pc. This routine returns true on
277 #define NBSD_MIPS_JB_PC (2 * 4)
278 #define NBSD_MIPS_JB_ELEMENT_SIZE mips_isa_regsize (current_gdbarch)
279 #define NBSD_MIPS_JB_OFFSET (NBSD_MIPS_JB_PC * \
280 NBSD_MIPS_JB_ELEMENT_SIZE)
283 mipsnbsd_get_longjmp_target (CORE_ADDR
*pc
)
288 buf
= alloca (NBSD_MIPS_JB_ELEMENT_SIZE
);
290 jb_addr
= read_register (MIPS_A0_REGNUM
);
292 if (target_read_memory (jb_addr
+ NBSD_MIPS_JB_OFFSET
, buf
,
293 NBSD_MIPS_JB_ELEMENT_SIZE
))
296 *pc
= extract_unsigned_integer (buf
, NBSD_MIPS_JB_ELEMENT_SIZE
);
302 mipsnbsd_cannot_fetch_register (int regno
)
304 return (regno
== MIPS_ZERO_REGNUM
305 || regno
== mips_regnum (current_gdbarch
)->fp_implementation_revision
);
309 mipsnbsd_cannot_store_register (int regno
)
311 return (regno
== MIPS_ZERO_REGNUM
312 || regno
== mips_regnum (current_gdbarch
)->fp_implementation_revision
);
315 /* NetBSD/mips uses a slightly different link_map structure from the
316 other NetBSD platforms. */
317 static struct link_map_offsets
*
318 mipsnbsd_ilp32_solib_svr4_fetch_link_map_offsets (void)
320 static struct link_map_offsets lmo
;
321 static struct link_map_offsets
*lmp
= NULL
;
327 lmo
.r_debug_size
= 16;
329 lmo
.r_map_offset
= 4;
332 lmo
.link_map_size
= 24;
334 lmo
.l_addr_offset
= 4;
337 lmo
.l_name_offset
= 8;
340 lmo
.l_next_offset
= 16;
343 lmo
.l_prev_offset
= 20;
350 static struct link_map_offsets
*
351 mipsnbsd_lp64_solib_svr4_fetch_link_map_offsets (void)
353 static struct link_map_offsets lmo
;
354 static struct link_map_offsets
*lmp
= NULL
;
360 lmo
.r_debug_size
= 32;
362 lmo
.r_map_offset
= 8;
365 lmo
.link_map_size
= 48;
367 lmo
.l_addr_offset
= 0;
370 lmo
.l_name_offset
= 16;
373 lmo
.l_next_offset
= 32;
376 lmo
.l_prev_offset
= 40;
384 mipsnbsd_init_abi (struct gdbarch_info info
,
385 struct gdbarch
*gdbarch
)
387 set_gdbarch_regset_from_core_section
388 (gdbarch
, mipsnbsd_regset_from_core_section
);
390 set_gdbarch_get_longjmp_target (gdbarch
, mipsnbsd_get_longjmp_target
);
392 set_gdbarch_cannot_fetch_register (gdbarch
, mipsnbsd_cannot_fetch_register
);
393 set_gdbarch_cannot_store_register (gdbarch
, mipsnbsd_cannot_store_register
);
395 set_gdbarch_software_single_step (gdbarch
, mips_software_single_step
);
397 set_solib_svr4_fetch_link_map_offsets (gdbarch
,
398 gdbarch_ptr_bit (gdbarch
) == 32 ?
399 mipsnbsd_ilp32_solib_svr4_fetch_link_map_offsets
:
400 mipsnbsd_lp64_solib_svr4_fetch_link_map_offsets
);
404 static enum gdb_osabi
405 mipsnbsd_core_osabi_sniffer (bfd
*abfd
)
407 if (strcmp (bfd_get_target (abfd
), "netbsd-core") == 0)
408 return GDB_OSABI_NETBSD_ELF
;
410 return GDB_OSABI_UNKNOWN
;
414 _initialize_mipsnbsd_tdep (void)
416 gdbarch_register_osabi (bfd_arch_mips
, 0, GDB_OSABI_NETBSD_ELF
,