1 /* Target-dependent code for OpenBSD/mips64.
3 Copyright (C) 2004-2014 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/>. */
25 #include "trad-frame.h"
26 #include "tramp-frame.h"
28 #include "gdb_assert.h"
31 #include "obsd-tdep.h"
32 #include "mips-tdep.h"
33 #include "solib-svr4.h"
35 /* The MIPS64 Floating-Point Quad-Precision format is similar to
36 big-endian IA-64 Quad-Precision format. */
37 #define floatformats_mips64_quad floatformats_ia64_quad
39 #define MIPS64OBSD_NUM_REGS 73
41 /* Core file support. */
43 /* Supply register REGNUM from the buffer specified by GREGS and LEN
44 in the general-purpose register set REGSET to register cache
45 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
48 mips64obsd_supply_gregset (const struct regset *regset,
49 struct regcache *regcache, int regnum,
50 const void *gregs, size_t len)
52 const char *regs = gregs;
55 for (i = 0; i < MIPS64OBSD_NUM_REGS; i++)
57 if (regnum == i || regnum == -1)
58 regcache_raw_supply (regcache, i, regs + i * 8);
62 /* OpenBSD/mips64 register set. */
64 static const struct regset mips64obsd_gregset =
67 mips64obsd_supply_gregset
70 /* Return the appropriate register set for the core section identified
71 by SECT_NAME and SECT_SIZE. */
73 static const struct regset *
74 mips64obsd_regset_from_core_section (struct gdbarch *gdbarch,
75 const char *sect_name, size_t sect_size)
77 if (strcmp (sect_name, ".reg") == 0 && sect_size >= MIPS64OBSD_NUM_REGS * 8)
78 return &mips64obsd_gregset;
84 /* Signal trampolines. */
87 mips64obsd_sigframe_init (const struct tramp_frame *self,
88 struct frame_info *this_frame,
89 struct trad_frame_cache *cache,
92 struct gdbarch *gdbarch = get_frame_arch (this_frame);
93 CORE_ADDR sp, sigcontext_addr, addr;
96 /* We find the appropriate instance of `struct sigcontext' at a
97 fixed offset in the signal frame. */
98 sp = get_frame_register_signed (this_frame,
99 MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
100 sigcontext_addr = sp + 32;
103 regnum = mips_regnum (gdbarch)->pc;
104 trad_frame_set_reg_addr (cache,
105 regnum + gdbarch_num_regs (gdbarch),
106 sigcontext_addr + 16);
109 for (regnum = MIPS_AT_REGNUM, addr = sigcontext_addr + 32;
110 regnum <= MIPS_RA_REGNUM; regnum++, addr += 8)
111 trad_frame_set_reg_addr (cache,
112 regnum + gdbarch_num_regs (gdbarch),
116 regnum = mips_regnum (gdbarch)->lo;
117 trad_frame_set_reg_addr (cache,
118 regnum + gdbarch_num_regs (gdbarch),
119 sigcontext_addr + 280);
120 regnum = mips_regnum (gdbarch)->hi;
121 trad_frame_set_reg_addr (cache,
122 regnum + gdbarch_num_regs (gdbarch),
123 sigcontext_addr + 288);
125 /* TODO: Handle the floating-point registers. */
127 trad_frame_set_id (cache, frame_id_build (sp, func));
130 static const struct tramp_frame mips64obsd_sigframe =
135 { 0x67a40020, -1 }, /* daddiu a0,sp,32 */
136 { 0x24020067, -1 }, /* li v0,103 */
137 { 0x0000000c, -1 }, /* syscall */
138 { 0x0000000d, -1 }, /* break */
139 { TRAMP_SENTINEL_INSN, -1 }
141 mips64obsd_sigframe_init
146 mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
148 /* OpenBSD/mips64 only supports the n64 ABI, but the braindamaged
149 way GDB works, forces us to pretend we can handle them all. */
151 set_gdbarch_regset_from_core_section
152 (gdbarch, mips64obsd_regset_from_core_section);
154 tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe);
156 set_gdbarch_long_double_bit (gdbarch, 128);
157 set_gdbarch_long_double_format (gdbarch, floatformats_mips64_quad);
159 obsd_init_abi(info, gdbarch);
161 /* OpenBSD/mips64 has SVR4-style shared libraries. */
162 set_solib_svr4_fetch_link_map_offsets
163 (gdbarch, svr4_lp64_fetch_link_map_offsets);
167 /* Provide a prototype to silence -Wmissing-prototypes. */
168 void _initialize_mips64obsd_tdep (void);
171 _initialize_mips64obsd_tdep (void)
173 gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD_ELF,
174 mips64obsd_init_abi);