1 /* Target-dependent code for OpenBSD/mips64. 2 3 Copyright 2004 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 2 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, write to the Free Software 19 Foundation, Inc., 59 Temple Place - Suite 330, 20 Boston, MA 02111-1307, USA. */ 21 22 #include "defs.h" 23 #include "osabi.h" 24 #include "regcache.h" 25 #include "regset.h" 26 #include "trad-frame.h" 27 #include "tramp-frame.h" 28 29 #include "gdb_assert.h" 30 #include "gdb_string.h" 31 32 #include "mips-tdep.h" 33 #include "solib-svr4.h" 34 35 #define MIPS64OBSD_NUM_REGS 73 36 37 /* Core file support. */ 38 39 /* Supply register REGNUM from the buffer specified by GREGS and LEN 40 in the general-purpose register set REGSET to register cache 41 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ 42 43 static void 44 mips64obsd_supply_gregset (const struct regset *regset, 45 struct regcache *regcache, int regnum, 46 const void *gregs, size_t len) 47 { 48 const char *regs = gregs; 49 int i; 50 51 for (i = 0; i < MIPS64OBSD_NUM_REGS; i++) 52 { 53 if (regnum == i || regnum == -1) 54 regcache_raw_supply (regcache, i, regs + i * 8); 55 } 56 } 57 58 /* OpenBSD/mips64 register set. */ 59 60 static struct regset mips64obsd_gregset = 61 { 62 NULL, 63 mips64obsd_supply_gregset 64 }; 65 66 /* Return the appropriate register set for the core section identified 67 by SECT_NAME and SECT_SIZE. */ 68 69 static const struct regset * 70 mips64obsd_regset_from_core_section (struct gdbarch *gdbarch, 71 const char *sect_name, size_t sect_size) 72 { 73 if (strcmp (sect_name, ".reg") == 0 && sect_size >= MIPS64OBSD_NUM_REGS * 8) 74 return &mips64obsd_gregset; 75 76 return NULL; 77 } 78 79 80 /* Signal trampolines. */ 81 82 static void 83 mips64obsd_sigframe_init (const struct tramp_frame *self, 84 struct frame_info *next_frame, 85 struct trad_frame_cache *cache, 86 CORE_ADDR func) 87 { 88 struct gdbarch *gdbarch = get_frame_arch (next_frame); 89 CORE_ADDR sp, sigcontext_addr, addr; 90 int regnum; 91 92 /* We find the appropriate instance of `struct sigcontext' at a 93 fixed offset in the signal frame. */ 94 sp = frame_unwind_register_signed (next_frame, MIPS_SP_REGNUM + NUM_REGS); 95 sigcontext_addr = sp + 32; 96 97 /* PC. */ 98 regnum = mips_regnum (gdbarch)->pc; 99 trad_frame_set_reg_addr (cache, regnum + NUM_REGS, sigcontext_addr + 16); 100 101 /* GPRs. */ 102 for (regnum = MIPS_AT_REGNUM, addr = sigcontext_addr + 32; 103 regnum <= MIPS_RA_REGNUM; regnum++, addr += 8) 104 trad_frame_set_reg_addr (cache, regnum + NUM_REGS, addr); 105 106 /* HI and LO. */ 107 regnum = mips_regnum (gdbarch)->lo; 108 trad_frame_set_reg_addr (cache, regnum + NUM_REGS, sigcontext_addr + 280); 109 regnum = mips_regnum (gdbarch)->hi; 110 trad_frame_set_reg_addr (cache, regnum + NUM_REGS, sigcontext_addr + 288); 111 112 /* TODO: Handle the floating-point registers. */ 113 114 trad_frame_set_id (cache, frame_id_build (sp, func)); 115 } 116 117 static const struct tramp_frame mips64obsd_sigframe = 118 { 119 SIGTRAMP_FRAME, 120 MIPS_INSN32_SIZE, 121 { 122 { 0x67a40020, -1 }, /* daddiu a0,sp,32 */ 123 { 0x24020067, -1 }, /* li v0,103 */ 124 { 0x0000000c, -1 }, /* syscall */ 125 { 0x0000000d, -1 }, /* break */ 126 { TRAMP_SENTINEL_INSN, -1 } 127 }, 128 mips64obsd_sigframe_init 129 }; 130 131 132 static void 133 mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 134 { 135 /* OpenBSD/mips64 only supports the n64 ABI, but the braindamaged 136 way GDB works, forces us to pretend we can handle them all. */ 137 138 set_gdbarch_regset_from_core_section 139 (gdbarch, mips64obsd_regset_from_core_section); 140 141 tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe); 142 143 #if 0 144 set_gdbarch_software_single_step (gdbarch, mips_software_single_step); 145 #endif 146 147 /* OpenBSD/mips64 has SVR4-style shared libraries. */ 148 set_solib_svr4_fetch_link_map_offsets 149 (gdbarch, svr4_lp64_fetch_link_map_offsets); 150 } 151 152 153 /* Provide a prototype to silence -Wmissing-prototypes. */ 154 void _initialize_mips64obsd_tdep (void); 155 156 void 157 _initialize_mips64obsd_tdep (void) 158 { 159 gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD_ELF, 160 mips64obsd_init_abi); 161 } 162