1 /* Target-dependent code for FreeBSD/amd64. 2 3 Copyright 2003, 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 "arch-utils.h" 24 #include "frame.h" 25 #include "gdbcore.h" 26 #include "regcache.h" 27 #include "osabi.h" 28 29 #include "gdb_string.h" 30 31 #include "amd64-tdep.h" 32 #include "solib-svr4.h" 33 34 /* Support for signal handlers. */ 35 36 /* Assuming NEXT_FRAME is for a frame following a BSD sigtramp 37 routine, return the address of the associated sigcontext structure. */ 38 39 static CORE_ADDR 40 amd64fbsd_sigcontext_addr (struct frame_info *next_frame) 41 { 42 CORE_ADDR sp; 43 44 /* The `struct sigcontext' (which really is an `ucontext_t' on 45 FreeBSD/amd64) lives at a fixed offset in the signal frame. See 46 <machine/sigframe.h>. */ 47 sp = frame_unwind_register_unsigned (next_frame, AMD64_RSP_REGNUM); 48 return sp + 16; 49 } 50 51 /* FreeBSD 5.1-RELEASE or later. */ 52 53 /* Mapping between the general-purpose registers in `struct reg' 54 format and GDB's register cache layout. 55 56 Note that some registers are 32-bit, but since we're little-endian 57 we get away with that. */ 58 59 /* From <machine/reg.h>. */ 60 static int amd64fbsd_r_reg_offset[] = 61 { 62 14 * 8, /* %rax */ 63 11 * 8, /* %rbx */ 64 13 * 8, /* %rcx */ 65 12 * 8, /* %rdx */ 66 9 * 8, /* %rsi */ 67 8 * 8, /* %rdi */ 68 10 * 8, /* %rbp */ 69 20 * 8, /* %rsp */ 70 7 * 8, /* %r8 ... */ 71 6 * 8, 72 5 * 8, 73 4 * 8, 74 3 * 8, 75 2 * 8, 76 1 * 8, 77 0 * 8, /* ... %r15 */ 78 17 * 8, /* %rip */ 79 19 * 8, /* %eflags */ 80 18 * 8, /* %cs */ 81 21 * 8, /* %ss */ 82 -1, /* %ds */ 83 -1, /* %es */ 84 -1, /* %fs */ 85 -1 /* %gs */ 86 }; 87 88 /* Location of the signal trampoline. */ 89 CORE_ADDR amd64fbsd_sigtramp_start_addr = 0x7fffffffffc0; 90 CORE_ADDR amd64fbsd_sigtramp_end_addr = 0x7fffffffffe0; 91 92 /* From <machine/signal.h>. */ 93 int amd64fbsd_sc_reg_offset[] = 94 { 95 24 + 6 * 8, /* %rax */ 96 24 + 7 * 8, /* %rbx */ 97 24 + 3 * 8, /* %rcx */ 98 24 + 2 * 8, /* %rdx */ 99 24 + 1 * 8, /* %rsi */ 100 24 + 0 * 8, /* %rdi */ 101 24 + 8 * 8, /* %rbp */ 102 24 + 22 * 8, /* %rsp */ 103 24 + 4 * 8, /* %r8 ... */ 104 24 + 5 * 8, 105 24 + 9 * 8, 106 24 + 10 * 8, 107 24 + 11 * 8, 108 24 + 12 * 8, 109 24 + 13 * 8, 110 24 + 14 * 8, /* ... %r15 */ 111 24 + 19 * 8, /* %rip */ 112 24 + 21 * 8, /* %eflags */ 113 24 + 20 * 8, /* %cs */ 114 24 + 23 * 8, /* %ss */ 115 -1, /* %ds */ 116 -1, /* %es */ 117 -1, /* %fs */ 118 -1 /* %gs */ 119 }; 120 121 void 122 amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 123 { 124 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 125 126 /* Obviously FreeBSD is BSD-based. */ 127 i386bsd_init_abi (info, gdbarch); 128 129 tdep->gregset_reg_offset = amd64fbsd_r_reg_offset; 130 tdep->gregset_num_regs = ARRAY_SIZE (amd64fbsd_r_reg_offset); 131 tdep->sizeof_gregset = 22 * 8; 132 133 amd64_init_abi (info, gdbarch); 134 135 tdep->sigtramp_start = amd64fbsd_sigtramp_start_addr; 136 tdep->sigtramp_end = amd64fbsd_sigtramp_end_addr; 137 tdep->sigcontext_addr = amd64fbsd_sigcontext_addr; 138 tdep->sc_reg_offset = amd64fbsd_sc_reg_offset; 139 tdep->sc_num_regs = ARRAY_SIZE (amd64fbsd_sc_reg_offset); 140 141 /* FreeBSD uses SVR4-style shared libraries. */ 142 set_solib_svr4_fetch_link_map_offsets 143 (gdbarch, svr4_lp64_fetch_link_map_offsets); 144 } 145 146 147 /* Provide a prototype to silence -Wmissing-prototypes. */ 148 void _initialize_amd64fbsd_tdep (void); 149 150 void 151 _initialize_amd64fbsd_tdep (void) 152 { 153 gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, 154 GDB_OSABI_FREEBSD_ELF, amd64fbsd_init_abi); 155 } 156