1 /* Target-dependent code for DragonFly/amd64. 2 3 Copyright (C) 2003-2013 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 "arch-utils.h" 22 #include "frame.h" 23 #include "gdbcore.h" 24 #include "regcache.h" 25 #include "osabi.h" 26 27 #include "gdb_assert.h" 28 #include "gdb_string.h" 29 30 #include "amd64-tdep.h" 31 #include "solib-svr4.h" 32 33 /* Support for signal handlers. */ 34 35 /* Assuming THIS_FRAME is for a BSD sigtramp routine, return the 36 address of the associated sigcontext structure. */ 37 38 static CORE_ADDR 39 amd64dfly_sigcontext_addr(struct frame_info *this_frame) 40 { 41 struct gdbarch *gdbarch = get_frame_arch(this_frame); 42 enum bfd_endian byte_order = gdbarch_byte_order(gdbarch); 43 CORE_ADDR sp; 44 gdb_byte buf[8]; 45 46 /* The `struct sigcontext' (which really is an `ucontext_t' on 47 * DragonFly/amd64) lives at a fixed offset in the signal frame. See 48 * <machine/sigframe.h>. */ 49 get_frame_register(this_frame, AMD64_RSP_REGNUM, buf); 50 sp = extract_unsigned_integer(buf, 8, byte_order); 51 return sp + 16; 52 } 53 54 55 /* Mapping between the general-purpose registers in `struct reg' 56 format and GDB's register cache layout. 57 58 Note that some registers are 32-bit, but since we're little-endian 59 we get away with that. */ 60 61 /* From <machine/reg.h>. */ 62 static int amd64dfly_r_reg_offset[] = 63 { 64 6 * 8, /* %rax */ 65 7 * 8, /* %rbx */ 66 3 * 8, /* %rcx */ 67 2 * 8, /* %rdx */ 68 1 * 8, /* %rsi */ 69 0 * 8, /* %rdi */ 70 8 * 8, /* %rbp */ 71 23 * 8, /* %rsp */ 72 4 * 8, /* %r8 ... */ 73 5 * 8, 74 9 * 8, 75 10 * 8, 76 11 * 8, 77 12 * 8, 78 13 * 8, 79 14 * 8, /* ... %r15 */ 80 20 * 8, /* %rip */ 81 22 * 8, /* %eflags */ 82 21 * 8, /* %cs */ 83 24 * 8, /* %ss */ 84 -1, /* %ds */ 85 -1, /* %es */ 86 -1, /* %fs */ 87 -1 /* %gs */ 88 }; 89 90 /* Location of the signal trampoline. */ 91 CORE_ADDR amd64dfly_sigtramp_start_addr = 0x7fffffffffc0ULL; 92 CORE_ADDR amd64dfly_sigtramp_end_addr = 0x7fffffffffe0ULL; 93 94 /* From <machine/signal.h>. */ 95 int amd64dfly_sc_reg_offset[] = 96 { 97 24 + 6 * 8, /* %rax */ 98 24 + 7 * 8, /* %rbx */ 99 24 + 3 * 8, /* %rcx */ 100 24 + 2 * 8, /* %rdx */ 101 24 + 1 * 8, /* %rsi */ 102 24 + 0 * 8, /* %rdi */ 103 24 + 8 * 8, /* %rbp */ 104 24 + 23 * 8, /* %rsp */ 105 24 + 4 * 8, /* %r8 ... */ 106 24 + 5 * 8, 107 24 + 9 * 8, 108 24 + 10 * 8, 109 24 + 11 * 8, 110 24 + 12 * 8, 111 24 + 13 * 8, 112 24 + 14 * 8, /* ... %r15 */ 113 24 + 20 * 8, /* %rip */ 114 24 + 22 * 8, /* %eflags */ 115 24 + 21 * 8, /* %cs */ 116 24 + 24 * 8, /* %ss */ 117 -1, /* %ds */ 118 -1, /* %es */ 119 -1, /* %fs */ 120 -1 /* %gs */ 121 }; 122 123 /* From /usr/src/lib/libc/amd64/gen/_setjmp.S. */ 124 static int amd64dfly_jmp_buf_reg_offset[] = 125 { 126 -1, /* %rax */ 127 1 * 8, /* %rbx */ 128 -1, /* %rcx */ 129 -1, /* %rdx */ 130 -1, /* %rsi */ 131 -1, /* %rdi */ 132 3 * 8, /* %rbp */ 133 2 * 8, /* %rsp */ 134 -1, /* %r8 ... */ 135 -1, 136 -1, 137 -1, /* ... %r11 */ 138 4 * 8, /* %r12 ... */ 139 5 * 8, 140 6 * 8, 141 7 * 8, /* ... %r15 */ 142 0 * 8 /* %rip */ 143 }; 144 145 static void 146 amd64dfly_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch) 147 { 148 struct gdbarch_tdep *tdep = gdbarch_tdep(gdbarch); 149 150 i386bsd_init_abi(info, gdbarch); 151 152 tdep->gregset_reg_offset = amd64dfly_r_reg_offset; 153 tdep->gregset_num_regs = ARRAY_SIZE(amd64dfly_r_reg_offset); 154 tdep->sizeof_gregset = 25 * 8; 155 156 amd64_init_abi(info, gdbarch); 157 158 tdep->sigtramp_start = amd64dfly_sigtramp_start_addr; 159 tdep->sigtramp_end = amd64dfly_sigtramp_end_addr; 160 tdep->sigcontext_addr = amd64dfly_sigcontext_addr; 161 tdep->sc_reg_offset = amd64dfly_sc_reg_offset; 162 tdep->sc_num_regs = ARRAY_SIZE(amd64dfly_sc_reg_offset); 163 164 set_solib_svr4_fetch_link_map_offsets 165 (gdbarch, svr4_lp64_fetch_link_map_offsets); 166 } 167 168 169 170 /* Provide a prototype to silence -Wmissing-prototypes. */ 171 void _initialize_amd64dfly_tdep(void); 172 173 void 174 _initialize_amd64dfly_tdep(void) 175 { 176 gdbarch_register_osabi(bfd_arch_i386, bfd_mach_x86_64, 177 GDB_OSABI_DRAGONFLY, amd64dfly_init_abi); 178 } 179