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 #include "symtab.h" 28 29 #include "gdb_assert.h" 30 31 #include "amd64-tdep.h" 32 #include "nbsd-tdep.h" 33 #include "solib-svr4.h" 34 35 /* Support for signal handlers. */ 36 37 /* Return whether the frame preceding NEXT_FRAME corresponds to a 38 NetBSD sigtramp routine. */ 39 40 static int 41 amd64nbsd_sigtramp_p (struct frame_info *next_frame) 42 { 43 CORE_ADDR pc = frame_pc_unwind (next_frame); 44 char *name; 45 46 find_pc_partial_function (pc, &name, NULL, NULL); 47 return nbsd_pc_in_sigtramp (pc, name); 48 } 49 50 /* Assuming NEXT_FRAME is preceded by a frame corresponding to a 51 NetBSD sigtramp routine, return the address of the associated 52 mcontext structure. */ 53 54 static CORE_ADDR 55 amd64nbsd_mcontext_addr (struct frame_info *next_frame) 56 { 57 CORE_ADDR addr; 58 59 /* The register %r15 points at `struct ucontext' upon entry of a 60 signal trampoline. */ 61 addr = frame_unwind_register_unsigned (next_frame, AMD64_R15_REGNUM); 62 63 /* The mcontext structure lives as offset 56 in `struct ucontext'. */ 64 return addr + 56; 65 } 66 67 /* NetBSD 2.0 or later. */ 68 69 /* Mapping between the general-purpose registers in `struct reg' 70 format and GDB's register cache layout. */ 71 72 /* From <machine/reg.h>. */ 73 int amd64nbsd_r_reg_offset[] = 74 { 75 14 * 8, /* %rax */ 76 13 * 8, /* %rbx */ 77 3 * 8, /* %rcx */ 78 2 * 8, /* %rdx */ 79 1 * 8, /* %rsi */ 80 0 * 8, /* %rdi */ 81 12 * 8, /* %rbp */ 82 24 * 8, /* %rsp */ 83 4 * 8, /* %r8 .. */ 84 5 * 8, 85 6 * 8, 86 7 * 8, 87 8 * 8, 88 9 * 8, 89 10 * 8, 90 11 * 8, /* ... %r15 */ 91 21 * 8, /* %rip */ 92 23 * 8, /* %eflags */ 93 22 * 8, /* %cs */ 94 25 * 8, /* %ss */ 95 18 * 8, /* %ds */ 96 17 * 8, /* %es */ 97 16 * 8, /* %fs */ 98 15 * 8 /* %gs */ 99 }; 100 101 static void 102 amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 103 { 104 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 105 106 /* Initialize general-purpose register set details first. */ 107 tdep->gregset_reg_offset = amd64nbsd_r_reg_offset; 108 tdep->gregset_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset); 109 tdep->sizeof_gregset = 26 * 8; 110 111 amd64_init_abi (info, gdbarch); 112 113 tdep->jb_pc_offset = 7 * 8; 114 115 /* NetBSD has its own convention for signal trampolines. */ 116 tdep->sigtramp_p = amd64nbsd_sigtramp_p; 117 tdep->sigcontext_addr = amd64nbsd_mcontext_addr; 118 tdep->sc_reg_offset = amd64nbsd_r_reg_offset; 119 tdep->sc_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset); 120 121 /* NetBSD uses SVR4-style shared libraries. */ 122 set_solib_svr4_fetch_link_map_offsets 123 (gdbarch, svr4_lp64_fetch_link_map_offsets); 124 } 125 126 127 /* Provide a prototype to silence -Wmissing-prototypes. */ 128 void _initialize_amd64nbsd_tdep (void); 129 130 void 131 _initialize_amd64nbsd_ndep (void) 132 { 133 /* The NetBSD/amd64 native dependent code makes this assumption. */ 134 gdb_assert (ARRAY_SIZE (amd64nbsd_r_reg_offset) == AMD64_NUM_GREGS); 135 136 gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, 137 GDB_OSABI_NETBSD_ELF, amd64nbsd_init_abi); 138 } 139