| 1 | /* Target-dependent code for OpenBSD/mips64. |
| 2 | |
| 3 | Copyright (C) 2004-2016 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 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. |
| 11 | |
| 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. |
| 16 | |
| 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/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "gdbtypes.h" |
| 22 | #include "osabi.h" |
| 23 | #include "regcache.h" |
| 24 | #include "regset.h" |
| 25 | #include "trad-frame.h" |
| 26 | #include "tramp-frame.h" |
| 27 | |
| 28 | #include "obsd-tdep.h" |
| 29 | #include "mips-tdep.h" |
| 30 | #include "solib-svr4.h" |
| 31 | |
| 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 |
| 35 | |
| 36 | #define MIPS64OBSD_NUM_REGS 73 |
| 37 | |
| 38 | /* Core file support. */ |
| 39 | |
| 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. */ |
| 43 | |
| 44 | static void |
| 45 | mips64obsd_supply_gregset (const struct regset *regset, |
| 46 | struct regcache *regcache, int regnum, |
| 47 | const void *gregs, size_t len) |
| 48 | { |
| 49 | const char *regs = (const char *) gregs; |
| 50 | int i; |
| 51 | |
| 52 | for (i = 0; i < MIPS64OBSD_NUM_REGS; i++) |
| 53 | { |
| 54 | if (regnum == i || regnum == -1) |
| 55 | regcache_raw_supply (regcache, i, regs + i * 8); |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | /* OpenBSD/mips64 register set. */ |
| 60 | |
| 61 | static const struct regset mips64obsd_gregset = |
| 62 | { |
| 63 | NULL, |
| 64 | mips64obsd_supply_gregset |
| 65 | }; |
| 66 | |
| 67 | /* Iterate over core file register note sections. */ |
| 68 | |
| 69 | static void |
| 70 | mips64obsd_iterate_over_regset_sections (struct gdbarch *gdbarch, |
| 71 | iterate_over_regset_sections_cb *cb, |
| 72 | void *cb_data, |
| 73 | const struct regcache *regcache) |
| 74 | { |
| 75 | cb (".reg", MIPS64OBSD_NUM_REGS * 8, &mips64obsd_gregset, NULL, cb_data); |
| 76 | } |
| 77 | \f |
| 78 | |
| 79 | /* Signal trampolines. */ |
| 80 | |
| 81 | static void |
| 82 | mips64obsd_sigframe_init (const struct tramp_frame *self, |
| 83 | struct frame_info *this_frame, |
| 84 | struct trad_frame_cache *cache, |
| 85 | CORE_ADDR func) |
| 86 | { |
| 87 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 88 | CORE_ADDR sp, sigcontext_addr, addr; |
| 89 | int regnum; |
| 90 | |
| 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; |
| 96 | |
| 97 | /* PC. */ |
| 98 | regnum = mips_regnum (gdbarch)->pc; |
| 99 | trad_frame_set_reg_addr (cache, |
| 100 | regnum + gdbarch_num_regs (gdbarch), |
| 101 | sigcontext_addr + 16); |
| 102 | |
| 103 | /* GPRs. */ |
| 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), |
| 108 | addr); |
| 109 | |
| 110 | /* HI and LO. */ |
| 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); |
| 119 | |
| 120 | /* TODO: Handle the floating-point registers. */ |
| 121 | |
| 122 | trad_frame_set_id (cache, frame_id_build (sp, func)); |
| 123 | } |
| 124 | |
| 125 | static const struct tramp_frame mips64obsd_sigframe = |
| 126 | { |
| 127 | SIGTRAMP_FRAME, |
| 128 | MIPS_INSN32_SIZE, |
| 129 | { |
| 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 } |
| 135 | }, |
| 136 | mips64obsd_sigframe_init |
| 137 | }; |
| 138 | |
| 139 | \f |
| 140 | static void |
| 141 | mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 142 | { |
| 143 | /* OpenBSD/mips64 only supports the n64 ABI, but the braindamaged |
| 144 | way GDB works, forces us to pretend we can handle them all. */ |
| 145 | |
| 146 | set_gdbarch_iterate_over_regset_sections |
| 147 | (gdbarch, mips64obsd_iterate_over_regset_sections); |
| 148 | |
| 149 | tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe); |
| 150 | |
| 151 | set_gdbarch_long_double_bit (gdbarch, 128); |
| 152 | set_gdbarch_long_double_format (gdbarch, floatformats_mips64_quad); |
| 153 | |
| 154 | obsd_init_abi(info, gdbarch); |
| 155 | |
| 156 | /* OpenBSD/mips64 has SVR4-style shared libraries. */ |
| 157 | set_solib_svr4_fetch_link_map_offsets |
| 158 | (gdbarch, svr4_lp64_fetch_link_map_offsets); |
| 159 | } |
| 160 | |
| 161 | \f |
| 162 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 163 | void _initialize_mips64obsd_tdep (void); |
| 164 | |
| 165 | void |
| 166 | _initialize_mips64obsd_tdep (void) |
| 167 | { |
| 168 | gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD_ELF, |
| 169 | mips64obsd_init_abi); |
| 170 | } |