1 /* Target-dependent code for OpenBSD/mips64. 2 3 Copyright (C) 2004-2023 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 #define MIPS64OBSD_NUM_REGS 73 33 34 /* Core file support. */ 35 36 /* Supply register REGNUM from the buffer specified by GREGS and LEN 37 in the general-purpose register set REGSET to register cache 38 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ 39 40 static void 41 mips64obsd_supply_gregset (const struct regset *regset, 42 struct regcache *regcache, int regnum, 43 const void *gregs, size_t len) 44 { 45 const char *regs = (const char *) gregs; 46 int i; 47 48 for (i = 0; i < MIPS64OBSD_NUM_REGS; i++) 49 { 50 if (regnum == i || regnum == -1) 51 regcache->raw_supply (i, regs + i * 8); 52 } 53 } 54 55 /* OpenBSD/mips64 register set. */ 56 57 static const struct regset mips64obsd_gregset = 58 { 59 NULL, 60 mips64obsd_supply_gregset 61 }; 62 63 /* Iterate over core file register note sections. */ 64 65 static void 66 mips64obsd_iterate_over_regset_sections (struct gdbarch *gdbarch, 67 iterate_over_regset_sections_cb *cb, 68 void *cb_data, 69 const struct regcache *regcache) 70 { 71 cb (".reg", MIPS64OBSD_NUM_REGS * 8, MIPS64OBSD_NUM_REGS * 8, 72 &mips64obsd_gregset, NULL, cb_data); 73 } 74 75 76 /* Signal trampolines. */ 77 78 static void 79 mips64obsd_sigframe_init (const struct tramp_frame *self, 80 frame_info_ptr this_frame, 81 struct trad_frame_cache *cache, 82 CORE_ADDR func) 83 { 84 struct gdbarch *gdbarch = get_frame_arch (this_frame); 85 CORE_ADDR sp, sigcontext_addr, addr; 86 int regnum; 87 88 /* We find the appropriate instance of `struct sigcontext' at a 89 fixed offset in the signal frame. */ 90 sp = get_frame_register_signed (this_frame, 91 MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch)); 92 sigcontext_addr = sp + 32; 93 94 /* PC. */ 95 regnum = mips_regnum (gdbarch)->pc; 96 trad_frame_set_reg_addr (cache, 97 regnum + gdbarch_num_regs (gdbarch), 98 sigcontext_addr + 16); 99 100 /* GPRs. */ 101 for (regnum = MIPS_AT_REGNUM, addr = sigcontext_addr + 32; 102 regnum <= MIPS_RA_REGNUM; regnum++, addr += 8) 103 trad_frame_set_reg_addr (cache, 104 regnum + gdbarch_num_regs (gdbarch), 105 addr); 106 107 /* HI and LO. */ 108 regnum = mips_regnum (gdbarch)->lo; 109 trad_frame_set_reg_addr (cache, 110 regnum + gdbarch_num_regs (gdbarch), 111 sigcontext_addr + 280); 112 regnum = mips_regnum (gdbarch)->hi; 113 trad_frame_set_reg_addr (cache, 114 regnum + gdbarch_num_regs (gdbarch), 115 sigcontext_addr + 288); 116 117 /* TODO: Handle the floating-point registers. */ 118 119 trad_frame_set_id (cache, frame_id_build (sp, func)); 120 } 121 122 static const struct tramp_frame mips64obsd_sigframe = 123 { 124 SIGTRAMP_FRAME, 125 MIPS_INSN32_SIZE, 126 { 127 { 0x67a40020, ULONGEST_MAX }, /* daddiu a0,sp,32 */ 128 { 0x24020067, ULONGEST_MAX }, /* li v0,103 */ 129 { 0x0000000c, ULONGEST_MAX }, /* syscall */ 130 { 0x0000000d, ULONGEST_MAX }, /* break */ 131 { TRAMP_SENTINEL_INSN, ULONGEST_MAX } 132 }, 133 mips64obsd_sigframe_init 134 }; 135 136 137 static void 138 mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 139 { 140 /* OpenBSD/mips64 only supports the n64 ABI, but the braindamaged 141 way GDB works, forces us to pretend we can handle them all. */ 142 143 set_gdbarch_iterate_over_regset_sections 144 (gdbarch, mips64obsd_iterate_over_regset_sections); 145 146 tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe); 147 148 set_gdbarch_long_double_bit (gdbarch, 128); 149 set_gdbarch_long_double_format (gdbarch, floatformats_ieee_quad); 150 151 obsd_init_abi(info, gdbarch); 152 153 /* OpenBSD/mips64 has SVR4-style shared libraries. */ 154 set_solib_svr4_fetch_link_map_offsets 155 (gdbarch, svr4_lp64_fetch_link_map_offsets); 156 } 157 158 void _initialize_mips64obsd_tdep (); 159 void 160 _initialize_mips64obsd_tdep () 161 { 162 gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD, 163 mips64obsd_init_abi); 164 } 165