1 /* Target-dependent code for NetBSD/mips.
3 Copyright (C) 2002-2014 Free Software Foundation, Inc.
5 Contributed by Wasabi Systems, Inc.
7 This file is part of GDB.
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 3 of the License, or
12 (at your option) any later version.
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.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
30 #include "nbsd-tdep.h"
31 #include "mipsnbsd-tdep.h"
32 #include "mips-tdep.h"
34 #include "solib-svr4.h"
36 /* Shorthand for some register numbers used below. */
37 #define MIPS_PC_REGNUM MIPS_EMBED_PC_REGNUM
38 #define MIPS_FP0_REGNUM MIPS_EMBED_FP0_REGNUM
39 #define MIPS_FSR_REGNUM MIPS_EMBED_FP0_REGNUM + 32
41 /* Core file support. */
43 /* Number of registers in `struct reg' from <machine/reg.h>. */
44 #define MIPSNBSD_NUM_GREGS 38
46 /* Number of registers in `struct fpreg' from <machine/reg.h>. */
47 #define MIPSNBSD_NUM_FPREGS 33
49 /* Supply register REGNUM from the buffer specified by FPREGS and LEN
50 in the floating-point register set REGSET to register cache
51 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
54 mipsnbsd_supply_fpregset (const struct regset
*regset
,
55 struct regcache
*regcache
,
56 int regnum
, const void *fpregs
, size_t len
)
58 size_t regsize
= mips_isa_regsize (get_regcache_arch (regcache
));
59 const char *regs
= fpregs
;
62 gdb_assert (len
>= MIPSNBSD_NUM_FPREGS
* regsize
);
64 for (i
= MIPS_FP0_REGNUM
; i
<= MIPS_FSR_REGNUM
; i
++)
66 if (regnum
== i
|| regnum
== -1)
67 regcache_raw_supply (regcache
, i
,
68 regs
+ (i
- MIPS_FP0_REGNUM
) * regsize
);
72 /* Supply register REGNUM from the buffer specified by GREGS and LEN
73 in the general-purpose register set REGSET to register cache
74 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
77 mipsnbsd_supply_gregset (const struct regset
*regset
,
78 struct regcache
*regcache
, int regnum
,
79 const void *gregs
, size_t len
)
81 size_t regsize
= mips_isa_regsize (get_regcache_arch (regcache
));
82 const char *regs
= gregs
;
85 gdb_assert (len
>= MIPSNBSD_NUM_GREGS
* regsize
);
87 for (i
= 0; i
<= MIPS_PC_REGNUM
; i
++)
89 if (regnum
== i
|| regnum
== -1)
90 regcache_raw_supply (regcache
, i
, regs
+ i
* regsize
);
93 if (len
>= (MIPSNBSD_NUM_GREGS
+ MIPSNBSD_NUM_FPREGS
) * regsize
)
95 regs
+= MIPSNBSD_NUM_GREGS
* regsize
;
96 len
-= MIPSNBSD_NUM_GREGS
* regsize
;
97 mipsnbsd_supply_fpregset (regset
, regcache
, regnum
, regs
, len
);
101 /* NetBSD/mips register sets. */
103 static const struct regset mipsnbsd_gregset
=
106 mipsnbsd_supply_gregset
109 static const struct regset mipsnbsd_fpregset
=
112 mipsnbsd_supply_fpregset
115 /* Return the appropriate register set for the core section identified
116 by SECT_NAME and SECT_SIZE. */
118 static const struct regset
*
119 mipsnbsd_regset_from_core_section (struct gdbarch
*gdbarch
,
120 const char *sect_name
, size_t sect_size
)
122 size_t regsize
= mips_isa_regsize (gdbarch
);
124 if (strcmp (sect_name
, ".reg") == 0
125 && sect_size
>= MIPSNBSD_NUM_GREGS
* regsize
)
126 return &mipsnbsd_gregset
;
128 if (strcmp (sect_name
, ".reg2") == 0
129 && sect_size
>= MIPSNBSD_NUM_FPREGS
* regsize
)
130 return &mipsnbsd_fpregset
;
136 /* Conveniently, GDB uses the same register numbering as the
137 ptrace register structure used by NetBSD/mips. */
140 mipsnbsd_supply_reg (struct regcache
*regcache
, const char *regs
, int regno
)
142 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
145 for (i
= 0; i
<= gdbarch_pc_regnum (gdbarch
); i
++)
147 if (regno
== i
|| regno
== -1)
149 if (gdbarch_cannot_fetch_register (gdbarch
, i
))
150 regcache_raw_supply (regcache
, i
, NULL
);
152 regcache_raw_supply (regcache
, i
,
153 regs
+ (i
* mips_isa_regsize (gdbarch
)));
159 mipsnbsd_fill_reg (const struct regcache
*regcache
, char *regs
, int regno
)
161 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
164 for (i
= 0; i
<= gdbarch_pc_regnum (gdbarch
); i
++)
165 if ((regno
== i
|| regno
== -1)
166 && ! gdbarch_cannot_store_register (gdbarch
, i
))
167 regcache_raw_collect (regcache
, i
,
168 regs
+ (i
* mips_isa_regsize (gdbarch
)));
172 mipsnbsd_supply_fpreg (struct regcache
*regcache
,
173 const char *fpregs
, int regno
)
175 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
178 for (i
= gdbarch_fp0_regnum (gdbarch
);
179 i
<= mips_regnum (gdbarch
)->fp_implementation_revision
;
182 if (regno
== i
|| regno
== -1)
184 if (gdbarch_cannot_fetch_register (gdbarch
, i
))
185 regcache_raw_supply (regcache
, i
, NULL
);
187 regcache_raw_supply (regcache
, i
,
189 + ((i
- gdbarch_fp0_regnum (gdbarch
))
190 * mips_isa_regsize (gdbarch
)));
196 mipsnbsd_fill_fpreg (const struct regcache
*regcache
, char *fpregs
, int regno
)
198 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
201 for (i
= gdbarch_fp0_regnum (gdbarch
);
202 i
<= mips_regnum (gdbarch
)->fp_control_status
;
204 if ((regno
== i
|| regno
== -1)
205 && ! gdbarch_cannot_store_register (gdbarch
, i
))
206 regcache_raw_collect (regcache
, i
,
207 fpregs
+ ((i
- gdbarch_fp0_regnum (gdbarch
))
208 * mips_isa_regsize (gdbarch
)));
213 /* Under NetBSD/mips, signal handler invocations can be identified by the
214 designated code sequence that is used to return from a signal handler.
215 In particular, the return address of a signal handler points to the
216 following code sequence:
219 li v0, 295 # __sigreturn14
222 Each instruction has a unique encoding, so we simply attempt to match
223 the instruction the PC is pointing to with any of the above instructions.
224 If there is a hit, we know the offset to the start of the designated
225 sequence and can then check whether we really are executing in the
226 signal trampoline. If not, -1 is returned, otherwise the offset from the
227 start of the return sequence is returned. */
229 #define RETCODE_NWORDS 3
230 #define RETCODE_SIZE (RETCODE_NWORDS * 4)
232 static const unsigned char sigtramp_retcode_mipsel
[RETCODE_SIZE
] =
234 0x10, 0x00, 0xa4, 0x27, /* addu a0, sp, 16 */
235 0x27, 0x01, 0x02, 0x24, /* li v0, 295 */
236 0x0c, 0x00, 0x00, 0x00, /* syscall */
239 static const unsigned char sigtramp_retcode_mipseb
[RETCODE_SIZE
] =
241 0x27, 0xa4, 0x00, 0x10, /* addu a0, sp, 16 */
242 0x24, 0x02, 0x01, 0x27, /* li v0, 295 */
243 0x00, 0x00, 0x00, 0x0c, /* syscall */
248 /* Figure out where the longjmp will land. We expect that we have
249 just entered longjmp and haven't yet setup the stack frame, so the
250 args are still in the argument regs. MIPS_A0_REGNUM points at the
251 jmp_buf structure from which we extract the PC that we will land
252 at. The PC is copied into *pc. This routine returns true on
255 #define NBSD_MIPS_JB_PC (2 * 4)
256 #define NBSD_MIPS_JB_ELEMENT_SIZE(gdbarch) mips_isa_regsize (gdbarch)
257 #define NBSD_MIPS_JB_OFFSET(gdbarch) (NBSD_MIPS_JB_PC * \
258 NBSD_MIPS_JB_ELEMENT_SIZE (gdbarch))
261 mipsnbsd_get_longjmp_target (struct frame_info
*frame
, CORE_ADDR
*pc
)
263 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
264 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
268 buf
= alloca (NBSD_MIPS_JB_ELEMENT_SIZE (gdbarch
));
270 jb_addr
= get_frame_register_unsigned (frame
, MIPS_A0_REGNUM
);
272 if (target_read_memory (jb_addr
+ NBSD_MIPS_JB_OFFSET (gdbarch
), buf
,
273 NBSD_MIPS_JB_ELEMENT_SIZE (gdbarch
)))
276 *pc
= extract_unsigned_integer (buf
, NBSD_MIPS_JB_ELEMENT_SIZE (gdbarch
),
282 mipsnbsd_cannot_fetch_register (struct gdbarch
*gdbarch
, int regno
)
284 return (regno
== MIPS_ZERO_REGNUM
285 || regno
== mips_regnum (gdbarch
)->fp_implementation_revision
);
289 mipsnbsd_cannot_store_register (struct gdbarch
*gdbarch
, int regno
)
291 return (regno
== MIPS_ZERO_REGNUM
292 || regno
== mips_regnum (gdbarch
)->fp_implementation_revision
);
295 /* Shared library support. */
297 /* NetBSD/mips uses a slightly different `struct link_map' than the
298 other NetBSD platforms. */
300 static struct link_map_offsets
*
301 mipsnbsd_ilp32_fetch_link_map_offsets (void)
303 static struct link_map_offsets lmo
;
304 static struct link_map_offsets
*lmp
= NULL
;
310 lmo
.r_version_offset
= 0;
311 lmo
.r_version_size
= 4;
312 lmo
.r_map_offset
= 4;
313 lmo
.r_brk_offset
= 8;
314 lmo
.r_ldsomap_offset
= -1;
316 /* Everything we need is in the first 24 bytes. */
317 lmo
.link_map_size
= 24;
318 lmo
.l_addr_offset
= 4;
319 lmo
.l_name_offset
= 8;
320 lmo
.l_ld_offset
= 12;
321 lmo
.l_next_offset
= 16;
322 lmo
.l_prev_offset
= 20;
328 static struct link_map_offsets
*
329 mipsnbsd_lp64_fetch_link_map_offsets (void)
331 static struct link_map_offsets lmo
;
332 static struct link_map_offsets
*lmp
= NULL
;
338 lmo
.r_version_offset
= 0;
339 lmo
.r_version_size
= 4;
340 lmo
.r_map_offset
= 8;
341 lmo
.r_brk_offset
= 16;
342 lmo
.r_ldsomap_offset
= -1;
344 /* Everything we need is in the first 40 bytes. */
345 lmo
.link_map_size
= 48;
346 lmo
.l_addr_offset
= 0;
347 lmo
.l_name_offset
= 16;
348 lmo
.l_ld_offset
= 24;
349 lmo
.l_next_offset
= 32;
350 lmo
.l_prev_offset
= 40;
358 mipsnbsd_init_abi (struct gdbarch_info info
,
359 struct gdbarch
*gdbarch
)
361 set_gdbarch_regset_from_core_section
362 (gdbarch
, mipsnbsd_regset_from_core_section
);
364 set_gdbarch_get_longjmp_target (gdbarch
, mipsnbsd_get_longjmp_target
);
366 set_gdbarch_cannot_fetch_register (gdbarch
, mipsnbsd_cannot_fetch_register
);
367 set_gdbarch_cannot_store_register (gdbarch
, mipsnbsd_cannot_store_register
);
369 set_gdbarch_software_single_step (gdbarch
, mips_software_single_step
);
371 /* NetBSD/mips has SVR4-style shared libraries. */
372 set_solib_svr4_fetch_link_map_offsets
373 (gdbarch
, (gdbarch_ptr_bit (gdbarch
) == 32 ?
374 mipsnbsd_ilp32_fetch_link_map_offsets
:
375 mipsnbsd_lp64_fetch_link_map_offsets
));
379 /* Provide a prototype to silence -Wmissing-prototypes. */
380 extern initialize_file_ftype _initialize_mipsnbsd_tdep
;
383 _initialize_mipsnbsd_tdep (void)
385 gdbarch_register_osabi (bfd_arch_mips
, 0, GDB_OSABI_NETBSD_ELF
,