1/* Target-dependent code for NetBSD/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 "osabi.h" 27 28#include "gdb_assert.h" 29 30#include "amd64-tdep.h" 31#include "nbsd-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 39static CORE_ADDR 40amd64nbsd_sigcontext_addr (struct frame_info *next_frame) 41{ 42 CORE_ADDR sp; 43 44 /* The stack pointer points at `struct sigcontext' upon entry of a 45 signal trampoline. */ 46 sp = frame_unwind_register_unsigned (next_frame, AMD64_RSP_REGNUM); 47 return sp; 48} 49 50/* NetBSD 2.0 or later. */ 51 52/* Mapping between the general-purpose registers in `struct reg' 53 format and GDB's register cache layout. */ 54 55/* From <machine/reg.h>. */ 56int amd64nbsd_r_reg_offset[] = 57{ 58 14 * 8, /* %rax */ 59 13 * 8, /* %rbx */ 60 3 * 8, /* %rcx */ 61 2 * 8, /* %rdx */ 62 1 * 8, /* %rsi */ 63 0 * 8, /* %rdi */ 64 12 * 8, /* %rbp */ 65 24 * 8, /* %rsp */ 66 4 * 8, /* %r8 .. */ 67 5 * 8, 68 6 * 8, 69 7 * 8, 70 8 * 8, 71 9 * 8, 72 10 * 8, 73 11 * 8, /* ... %r15 */ 74 21 * 8, /* %rip */ 75 23 * 8, /* %eflags */ 76 22 * 8, /* %cs */ 77 25 * 8, /* %ss */ 78 18 * 8, /* %ds */ 79 17 * 8, /* %es */ 80 16 * 8, /* %fs */ 81 15 * 8 /* %gs */ 82}; 83 84static void 85amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 86{ 87 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 88 int *sc_reg_offset; 89 int i; 90 91 /* Initialize general-purpose register set details first. */ 92 tdep->gregset_reg_offset = amd64nbsd_r_reg_offset; 93 tdep->gregset_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset); 94 tdep->sizeof_gregset = 26 * 8; 95 96 amd64_init_abi (info, gdbarch); 97 98 tdep->jb_pc_offset = 7 * 8; 99 100 /* NetBSD has its own convention for signal trampolines. */ 101 set_gdbarch_pc_in_sigtramp (gdbarch, nbsd_pc_in_sigtramp); 102 tdep->sigcontext_addr = amd64nbsd_sigcontext_addr; 103 104 /* Initialize the array with register offsets in `struct 105 sigcontext'. This `struct sigcontext' has an sc_mcontext member 106 at offset 32, and in <machine/reg.h> we have an explicit comment 107 saying that `struct reg' is the same as mcontext.__gregs. */ 108 tdep->sc_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset); 109 tdep->sc_reg_offset = XCALLOC (tdep->sc_num_regs, int); 110 for (i = 0; i < tdep->sc_num_regs; i++) 111 { 112 if (amd64nbsd_r_reg_offset[i] < 0) 113 tdep->sc_reg_offset[i] = -1; 114 else 115 tdep->sc_reg_offset[i] = 32 + amd64nbsd_r_reg_offset[i]; 116 } 117 118 /* NetBSD uses SVR4-style shared libraries. */ 119 set_solib_svr4_fetch_link_map_offsets 120 (gdbarch, svr4_lp64_fetch_link_map_offsets); 121} 122 123 124/* Provide a prototype to silence -Wmissing-prototypes. */ 125void _initialize_amd64nbsd_tdep (void); 126 127void 128_initialize_amd64nbsd_ndep (void) 129{ 130 /* The NetBSD/amd64 native dependent code makes this assumption. */ 131 gdb_assert (ARRAY_SIZE (amd64nbsd_r_reg_offset) == AMD64_NUM_GREGS); 132 133 gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, 134 GDB_OSABI_NETBSD_ELF, amd64nbsd_init_abi); 135} 136