1 /* Target-dependent code for OpenBSD/mips64.
3 Copyright (C) 2004-2016 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 "obsd-tdep.h"
29 #include "mips-tdep.h"
30 #include "solib-svr4.h"
32 /* The MIPS64 Floating-Point Quad-Precision format is similar to
33 big-endian IA-64 Quad-Precision format. */
34 #define floatformats_mips64_quad floatformats_ia64_quad
36 #define MIPS64OBSD_NUM_REGS 73
38 /* Core file support. */
40 /* Supply register REGNUM from the buffer specified by GREGS and LEN
41 in the general-purpose register set REGSET to register cache
42 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
45 mips64obsd_supply_gregset (const struct regset *regset,
46 struct regcache *regcache, int regnum,
47 const void *gregs, size_t len)
49 const char *regs = (const char *) gregs;
52 for (i = 0; i < MIPS64OBSD_NUM_REGS; i++)
54 if (regnum == i || regnum == -1)
55 regcache_raw_supply (regcache, i, regs + i * 8);
59 /* OpenBSD/mips64 register set. */
61 static const struct regset mips64obsd_gregset =
64 mips64obsd_supply_gregset
67 /* Iterate over core file register note sections. */
70 mips64obsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
71 iterate_over_regset_sections_cb *cb,
73 const struct regcache *regcache)
75 cb (".reg", MIPS64OBSD_NUM_REGS * 8, &mips64obsd_gregset, NULL, cb_data);
79 /* Signal trampolines. */
82 mips64obsd_sigframe_init (const struct tramp_frame *self,
83 struct frame_info *this_frame,
84 struct trad_frame_cache *cache,
87 struct gdbarch *gdbarch = get_frame_arch (this_frame);
88 CORE_ADDR sp, sigcontext_addr, addr;
91 /* We find the appropriate instance of `struct sigcontext' at a
92 fixed offset in the signal frame. */
93 sp = get_frame_register_signed (this_frame,
94 MIPS_SP_REGNUM + 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_iterate_over_regset_sections
147 (gdbarch, mips64obsd_iterate_over_regset_sections);
149 tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe);
151 set_gdbarch_long_double_bit (gdbarch, 128);
152 set_gdbarch_long_double_format (gdbarch, floatformats_mips64_quad);
154 obsd_init_abi(info, gdbarch);
156 /* OpenBSD/mips64 has SVR4-style shared libraries. */
157 set_solib_svr4_fetch_link_map_offsets
158 (gdbarch, svr4_lp64_fetch_link_map_offsets);
162 /* Provide a prototype to silence -Wmissing-prototypes. */
163 void _initialize_mips64obsd_tdep (void);
166 _initialize_mips64obsd_tdep (void)
168 gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD_ELF,
169 mips64obsd_init_abi);