1 /* Target-dependent code for OpenBSD/mips64.
3 Copyright (C) 2004, 2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>. */
24 #include "trad-frame.h"
25 #include "tramp-frame.h"
27 #include "gdb_assert.h"
28 #include "gdb_string.h"
30 #include "mips-tdep.h"
31 #include "solib-svr4.h"
33 #define MIPS64OBSD_NUM_REGS 73
35 /* Core file support. */
37 /* Supply register REGNUM from the buffer specified by GREGS and LEN
38 in the general-purpose register set REGSET to register cache
39 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
42 mips64obsd_supply_gregset (const struct regset *regset,
43 struct regcache *regcache, int regnum,
44 const void *gregs, size_t len)
46 const char *regs = gregs;
49 for (i = 0; i < MIPS64OBSD_NUM_REGS; i++)
51 if (regnum == i || regnum == -1)
52 regcache_raw_supply (regcache, i, regs + i * 8);
56 /* OpenBSD/mips64 register set. */
58 static struct regset mips64obsd_gregset =
61 mips64obsd_supply_gregset
64 /* Return the appropriate register set for the core section identified
65 by SECT_NAME and SECT_SIZE. */
67 static const struct regset *
68 mips64obsd_regset_from_core_section (struct gdbarch *gdbarch,
69 const char *sect_name, size_t sect_size)
71 if (strcmp (sect_name, ".reg") == 0 && sect_size >= MIPS64OBSD_NUM_REGS * 8)
72 return &mips64obsd_gregset;
78 /* Signal trampolines. */
81 mips64obsd_sigframe_init (const struct tramp_frame *self,
82 struct frame_info *next_frame,
83 struct trad_frame_cache *cache,
86 struct gdbarch *gdbarch = get_frame_arch (next_frame);
87 CORE_ADDR sp, sigcontext_addr, addr;
90 /* We find the appropriate instance of `struct sigcontext' at a
91 fixed offset in the signal frame. */
92 sp = frame_unwind_register_signed (next_frame,
94 + gdbarch_num_regs (gdbarch));
95 sigcontext_addr = sp + 32;
98 regnum = mips_regnum (gdbarch)->pc;
99 trad_frame_set_reg_addr (cache,
100 regnum + gdbarch_num_regs (gdbarch),
101 sigcontext_addr + 16);
104 for (regnum = MIPS_AT_REGNUM, addr = sigcontext_addr + 32;
105 regnum <= MIPS_RA_REGNUM; regnum++, addr += 8)
106 trad_frame_set_reg_addr (cache,
107 regnum + gdbarch_num_regs (gdbarch),
111 regnum = mips_regnum (gdbarch)->lo;
112 trad_frame_set_reg_addr (cache,
113 regnum + gdbarch_num_regs (gdbarch),
114 sigcontext_addr + 280);
115 regnum = mips_regnum (gdbarch)->hi;
116 trad_frame_set_reg_addr (cache,
117 regnum + gdbarch_num_regs (gdbarch),
118 sigcontext_addr + 288);
120 /* TODO: Handle the floating-point registers. */
122 trad_frame_set_id (cache, frame_id_build (sp, func));
125 static const struct tramp_frame mips64obsd_sigframe =
130 { 0x67a40020, -1 }, /* daddiu a0,sp,32 */
131 { 0x24020067, -1 }, /* li v0,103 */
132 { 0x0000000c, -1 }, /* syscall */
133 { 0x0000000d, -1 }, /* break */
134 { TRAMP_SENTINEL_INSN, -1 }
136 mips64obsd_sigframe_init
141 mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
143 /* OpenBSD/mips64 only supports the n64 ABI, but the braindamaged
144 way GDB works, forces us to pretend we can handle them all. */
146 set_gdbarch_regset_from_core_section
147 (gdbarch, mips64obsd_regset_from_core_section);
149 tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe);
151 /* OpenBSD/mips64 has SVR4-style shared libraries. */
152 set_solib_svr4_fetch_link_map_offsets
153 (gdbarch, svr4_lp64_fetch_link_map_offsets);
157 /* Provide a prototype to silence -Wmissing-prototypes. */
158 void _initialize_mips64obsd_tdep (void);
161 _initialize_mips64obsd_tdep (void)
163 gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD_ELF,
164 mips64obsd_init_abi);