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 "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 = 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 /* Return the appropriate register set for the core section identified
68 by SECT_NAME and SECT_SIZE. */
70 static const struct regset *
71 mips64obsd_regset_from_core_section (struct gdbarch *gdbarch,
72 const char *sect_name, size_t sect_size)
74 if (strcmp (sect_name, ".reg") == 0 && sect_size >= MIPS64OBSD_NUM_REGS * 8)
75 return &mips64obsd_gregset;
81 /* Signal trampolines. */
84 mips64obsd_sigframe_init (const struct tramp_frame *self,
85 struct frame_info *this_frame,
86 struct trad_frame_cache *cache,
89 struct gdbarch *gdbarch = get_frame_arch (this_frame);
90 CORE_ADDR sp, sigcontext_addr, addr;
93 /* We find the appropriate instance of `struct sigcontext' at a
94 fixed offset in the signal frame. */
95 sp = get_frame_register_signed (this_frame,
96 MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
97 sigcontext_addr = sp + 32;
100 regnum = mips_regnum (gdbarch)->pc;
101 trad_frame_set_reg_addr (cache,
102 regnum + gdbarch_num_regs (gdbarch),
103 sigcontext_addr + 16);
106 for (regnum = MIPS_AT_REGNUM, addr = sigcontext_addr + 32;
107 regnum <= MIPS_RA_REGNUM; regnum++, addr += 8)
108 trad_frame_set_reg_addr (cache,
109 regnum + gdbarch_num_regs (gdbarch),
113 regnum = mips_regnum (gdbarch)->lo;
114 trad_frame_set_reg_addr (cache,
115 regnum + gdbarch_num_regs (gdbarch),
116 sigcontext_addr + 280);
117 regnum = mips_regnum (gdbarch)->hi;
118 trad_frame_set_reg_addr (cache,
119 regnum + gdbarch_num_regs (gdbarch),
120 sigcontext_addr + 288);
122 /* TODO: Handle the floating-point registers. */
124 trad_frame_set_id (cache, frame_id_build (sp, func));
127 static const struct tramp_frame mips64obsd_sigframe =
132 { 0x67a40020, -1 }, /* daddiu a0,sp,32 */
133 { 0x24020067, -1 }, /* li v0,103 */
134 { 0x0000000c, -1 }, /* syscall */
135 { 0x0000000d, -1 }, /* break */
136 { TRAMP_SENTINEL_INSN, -1 }
138 mips64obsd_sigframe_init
143 mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
145 /* OpenBSD/mips64 only supports the n64 ABI, but the braindamaged
146 way GDB works, forces us to pretend we can handle them all. */
148 set_gdbarch_regset_from_core_section
149 (gdbarch, mips64obsd_regset_from_core_section);
151 tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe);
153 set_gdbarch_long_double_bit (gdbarch, 128);
154 set_gdbarch_long_double_format (gdbarch, floatformats_mips64_quad);
156 obsd_init_abi(info, gdbarch);
158 /* OpenBSD/mips64 has SVR4-style shared libraries. */
159 set_solib_svr4_fetch_link_map_offsets
160 (gdbarch, svr4_lp64_fetch_link_map_offsets);
164 /* Provide a prototype to silence -Wmissing-prototypes. */
165 void _initialize_mips64obsd_tdep (void);
168 _initialize_mips64obsd_tdep (void)
170 gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD_ELF,
171 mips64obsd_init_abi);