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/>. */
32 #include "nbsd-tdep.h"
33 #include "mipsnbsd-tdep.h"
34 #include "mips-tdep.h"
36 #include "solib-svr4.h"
38 /* Shorthand for some register numbers used below. */
39 #define MIPS_PC_REGNUM MIPS_EMBED_PC_REGNUM
40 #define MIPS_FP0_REGNUM MIPS_EMBED_FP0_REGNUM
41 #define MIPS_FSR_REGNUM MIPS_EMBED_FP0_REGNUM + 32
43 /* Core file support. */
45 /* Number of registers in `struct reg' from <machine/reg.h>. */
46 #define MIPSNBSD_NUM_GREGS 38
48 /* Number of registers in `struct fpreg' from <machine/reg.h>. */
49 #define MIPSNBSD_NUM_FPREGS 33
51 /* Supply register REGNUM from the buffer specified by FPREGS and LEN
52 in the floating-point register set REGSET to register cache
53 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
56 mipsnbsd_supply_fpregset (const struct regset *regset,
57 struct regcache *regcache,
58 int regnum, const void *fpregs, size_t len)
60 size_t regsize = mips_isa_regsize (get_regcache_arch (regcache));
61 const char *regs = fpregs;
64 gdb_assert (len >= MIPSNBSD_NUM_FPREGS * regsize);
66 for (i = MIPS_FP0_REGNUM; i <= MIPS_FSR_REGNUM; i++)
68 if (regnum == i || regnum == -1)
69 regcache_raw_supply (regcache, i,
70 regs + (i - MIPS_FP0_REGNUM) * regsize);
74 /* Supply register REGNUM from the buffer specified by GREGS and LEN
75 in the general-purpose register set REGSET to register cache
76 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
79 mipsnbsd_supply_gregset (const struct regset *regset,
80 struct regcache *regcache, int regnum,
81 const void *gregs, size_t len)
83 size_t regsize = mips_isa_regsize (get_regcache_arch (regcache));
84 const char *regs = gregs;
87 gdb_assert (len >= MIPSNBSD_NUM_GREGS * regsize);
89 for (i = 0; i <= MIPS_PC_REGNUM; i++)
91 if (regnum == i || regnum == -1)
92 regcache_raw_supply (regcache, i, regs + i * regsize);
95 if (len >= (MIPSNBSD_NUM_GREGS + MIPSNBSD_NUM_FPREGS) * regsize)
97 regs += MIPSNBSD_NUM_GREGS * regsize;
98 len -= MIPSNBSD_NUM_GREGS * regsize;
99 mipsnbsd_supply_fpregset (regset, regcache, regnum, regs, len);
103 /* NetBSD/mips register sets. */
105 static const struct regset mipsnbsd_gregset =
108 mipsnbsd_supply_gregset
111 static const struct regset mipsnbsd_fpregset =
114 mipsnbsd_supply_fpregset
117 /* Return the appropriate register set for the core section identified
118 by SECT_NAME and SECT_SIZE. */
120 static const struct regset *
121 mipsnbsd_regset_from_core_section (struct gdbarch *gdbarch,
122 const char *sect_name, size_t sect_size)
124 size_t regsize = mips_isa_regsize (gdbarch);
126 if (strcmp (sect_name, ".reg") == 0
127 && sect_size >= MIPSNBSD_NUM_GREGS * regsize)
128 return &mipsnbsd_gregset;
130 if (strcmp (sect_name, ".reg2") == 0
131 && sect_size >= MIPSNBSD_NUM_FPREGS * regsize)
132 return &mipsnbsd_fpregset;
138 /* Conveniently, GDB uses the same register numbering as the
139 ptrace register structure used by NetBSD/mips. */
142 mipsnbsd_supply_reg (struct regcache *regcache, const char *regs, int regno)
144 struct gdbarch *gdbarch = get_regcache_arch (regcache);
147 for (i = 0; i <= gdbarch_pc_regnum (gdbarch); i++)
149 if (regno == i || regno == -1)
151 if (gdbarch_cannot_fetch_register (gdbarch, i))
152 regcache_raw_supply (regcache, i, NULL);
154 regcache_raw_supply (regcache, i,
155 regs + (i * mips_isa_regsize (gdbarch)));
161 mipsnbsd_fill_reg (const struct regcache *regcache, char *regs, int regno)
163 struct gdbarch *gdbarch = get_regcache_arch (regcache);
166 for (i = 0; i <= gdbarch_pc_regnum (gdbarch); i++)
167 if ((regno == i || regno == -1)
168 && ! gdbarch_cannot_store_register (gdbarch, i))
169 regcache_raw_collect (regcache, i,
170 regs + (i * mips_isa_regsize (gdbarch)));
174 mipsnbsd_supply_fpreg (struct regcache *regcache,
175 const char *fpregs, int regno)
177 struct gdbarch *gdbarch = get_regcache_arch (regcache);
180 for (i = gdbarch_fp0_regnum (gdbarch);
181 i <= mips_regnum (gdbarch)->fp_implementation_revision;
184 if (regno == i || regno == -1)
186 if (gdbarch_cannot_fetch_register (gdbarch, i))
187 regcache_raw_supply (regcache, i, NULL);
189 regcache_raw_supply (regcache, i,
191 + ((i - gdbarch_fp0_regnum (gdbarch))
192 * mips_isa_regsize (gdbarch)));
198 mipsnbsd_fill_fpreg (const struct regcache *regcache, char *fpregs, int regno)
200 struct gdbarch *gdbarch = get_regcache_arch (regcache);
203 for (i = gdbarch_fp0_regnum (gdbarch);
204 i <= mips_regnum (gdbarch)->fp_control_status;
206 if ((regno == i || regno == -1)
207 && ! gdbarch_cannot_store_register (gdbarch, i))
208 regcache_raw_collect (regcache, i,
209 fpregs + ((i - gdbarch_fp0_regnum (gdbarch))
210 * mips_isa_regsize (gdbarch)));
215 /* Under NetBSD/mips, signal handler invocations can be identified by the
216 designated code sequence that is used to return from a signal handler.
217 In particular, the return address of a signal handler points to the
218 following code sequence:
221 li v0, 295 # __sigreturn14
224 Each instruction has a unique encoding, so we simply attempt to match
225 the instruction the PC is pointing to with any of the above instructions.
226 If there is a hit, we know the offset to the start of the designated
227 sequence and can then check whether we really are executing in the
228 signal trampoline. If not, -1 is returned, otherwise the offset from the
229 start of the return sequence is returned. */
231 #define RETCODE_NWORDS 3
232 #define RETCODE_SIZE (RETCODE_NWORDS * 4)
234 static const unsigned char sigtramp_retcode_mipsel[RETCODE_SIZE] =
236 0x10, 0x00, 0xa4, 0x27, /* addu a0, sp, 16 */
237 0x27, 0x01, 0x02, 0x24, /* li v0, 295 */
238 0x0c, 0x00, 0x00, 0x00, /* syscall */
241 static const unsigned char sigtramp_retcode_mipseb[RETCODE_SIZE] =
243 0x27, 0xa4, 0x00, 0x10, /* addu a0, sp, 16 */
244 0x24, 0x02, 0x01, 0x27, /* li v0, 295 */
245 0x00, 0x00, 0x00, 0x0c, /* syscall */
250 /* Figure out where the longjmp will land. We expect that we have
251 just entered longjmp and haven't yet setup the stack frame, so the
252 args are still in the argument regs. MIPS_A0_REGNUM points at the
253 jmp_buf structure from which we extract the PC that we will land
254 at. The PC is copied into *pc. This routine returns true on
257 #define NBSD_MIPS_JB_PC (2 * 4)
258 #define NBSD_MIPS_JB_ELEMENT_SIZE(gdbarch) mips_isa_regsize (gdbarch)
259 #define NBSD_MIPS_JB_OFFSET(gdbarch) (NBSD_MIPS_JB_PC * \
260 NBSD_MIPS_JB_ELEMENT_SIZE (gdbarch))
263 mipsnbsd_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
265 struct gdbarch *gdbarch = get_frame_arch (frame);
266 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
270 buf = alloca (NBSD_MIPS_JB_ELEMENT_SIZE (gdbarch));
272 jb_addr = get_frame_register_unsigned (frame, MIPS_A0_REGNUM);
274 if (target_read_memory (jb_addr + NBSD_MIPS_JB_OFFSET (gdbarch), buf,
275 NBSD_MIPS_JB_ELEMENT_SIZE (gdbarch)))
278 *pc = extract_unsigned_integer (buf, NBSD_MIPS_JB_ELEMENT_SIZE (gdbarch),
284 mipsnbsd_cannot_fetch_register (struct gdbarch *gdbarch, int regno)
286 return (regno == MIPS_ZERO_REGNUM
287 || regno == mips_regnum (gdbarch)->fp_implementation_revision);
291 mipsnbsd_cannot_store_register (struct gdbarch *gdbarch, int regno)
293 return (regno == MIPS_ZERO_REGNUM
294 || regno == mips_regnum (gdbarch)->fp_implementation_revision);
297 /* Shared library support. */
299 /* NetBSD/mips uses a slightly different `struct link_map' than the
300 other NetBSD platforms. */
302 static struct link_map_offsets *
303 mipsnbsd_ilp32_fetch_link_map_offsets (void)
305 static struct link_map_offsets lmo;
306 static struct link_map_offsets *lmp = NULL;
312 lmo.r_version_offset = 0;
313 lmo.r_version_size = 4;
314 lmo.r_map_offset = 4;
315 lmo.r_brk_offset = 8;
316 lmo.r_ldsomap_offset = -1;
318 /* Everything we need is in the first 24 bytes. */
319 lmo.link_map_size = 24;
320 lmo.l_addr_offset = 4;
321 lmo.l_name_offset = 8;
322 lmo.l_ld_offset = 12;
323 lmo.l_next_offset = 16;
324 lmo.l_prev_offset = 20;
330 static struct link_map_offsets *
331 mipsnbsd_lp64_fetch_link_map_offsets (void)
333 static struct link_map_offsets lmo;
334 static struct link_map_offsets *lmp = NULL;
340 lmo.r_version_offset = 0;
341 lmo.r_version_size = 4;
342 lmo.r_map_offset = 8;
343 lmo.r_brk_offset = 16;
344 lmo.r_ldsomap_offset = -1;
346 /* Everything we need is in the first 40 bytes. */
347 lmo.link_map_size = 48;
348 lmo.l_addr_offset = 0;
349 lmo.l_name_offset = 16;
350 lmo.l_ld_offset = 24;
351 lmo.l_next_offset = 32;
352 lmo.l_prev_offset = 40;
360 mipsnbsd_init_abi (struct gdbarch_info info,
361 struct gdbarch *gdbarch)
363 set_gdbarch_regset_from_core_section
364 (gdbarch, mipsnbsd_regset_from_core_section);
366 set_gdbarch_get_longjmp_target (gdbarch, mipsnbsd_get_longjmp_target);
368 set_gdbarch_cannot_fetch_register (gdbarch, mipsnbsd_cannot_fetch_register);
369 set_gdbarch_cannot_store_register (gdbarch, mipsnbsd_cannot_store_register);
371 set_gdbarch_software_single_step (gdbarch, mips_software_single_step);
373 /* NetBSD/mips has SVR4-style shared libraries. */
374 set_solib_svr4_fetch_link_map_offsets
375 (gdbarch, (gdbarch_ptr_bit (gdbarch) == 32 ?
376 mipsnbsd_ilp32_fetch_link_map_offsets :
377 mipsnbsd_lp64_fetch_link_map_offsets));
381 /* Provide a prototype to silence -Wmissing-prototypes. */
382 extern initialize_file_ftype _initialize_mipsnbsd_tdep;
385 _initialize_mipsnbsd_tdep (void)
387 gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_NETBSD_ELF,