1 /* Target-dependent code for OpenBSD/mips64. 2 3 Copyright (C) 2004-2017 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 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 }; 138 139 140 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 } 160 161 162 /* 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, 169 mips64obsd_init_abi); 170 } 171