1 /* Darwin support for GDB, the GNU debugger. 2 Copyright (C) 1997-2016 Free Software Foundation, Inc. 3 4 Contributed by Apple Computer, Inc. 5 6 This file is part of GDB. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 20 21 #include "defs.h" 22 #include "frame.h" 23 #include "inferior.h" 24 #include "gdbcore.h" 25 #include "target.h" 26 #include "floatformat.h" 27 #include "symtab.h" 28 #include "regcache.h" 29 #include "objfiles.h" 30 31 #include "i387-tdep.h" 32 #include "amd64-tdep.h" 33 #include "osabi.h" 34 #include "ui-out.h" 35 #include "amd64-darwin-tdep.h" 36 #include "i386-darwin-tdep.h" 37 #include "solib.h" 38 #include "solib-darwin.h" 39 #include "dwarf2-frame.h" 40 41 /* Offsets into the struct x86_thread_state64 where we'll find the saved regs. 42 From <mach/i386/thread_status.h> and amd64-tdep.h. */ 43 int amd64_darwin_thread_state_reg_offset[] = 44 { 45 0 * 8, /* %rax */ 46 1 * 8, /* %rbx */ 47 2 * 8, /* %rcx */ 48 3 * 8, /* %rdx */ 49 5 * 8, /* %rsi */ 50 4 * 8, /* %rdi */ 51 6 * 8, /* %rbp */ 52 7 * 8, /* %rsp */ 53 8 * 8, /* %r8 ... */ 54 9 * 8, 55 10 * 8, 56 11 * 8, 57 12 * 8, 58 13 * 8, 59 14 * 8, 60 15 * 8, /* ... %r15 */ 61 16 * 8, /* %rip */ 62 17 * 8, /* %rflags */ 63 18 * 8, /* %cs */ 64 -1, /* %ss */ 65 -1, /* %ds */ 66 -1, /* %es */ 67 19 * 8, /* %fs */ 68 20 * 8 /* %gs */ 69 }; 70 71 const int amd64_darwin_thread_state_num_regs = 72 ARRAY_SIZE (amd64_darwin_thread_state_reg_offset); 73 74 /* Assuming THIS_FRAME is a Darwin sigtramp routine, return the 75 address of the associated sigcontext structure. */ 76 77 static CORE_ADDR 78 amd64_darwin_sigcontext_addr (struct frame_info *this_frame) 79 { 80 struct gdbarch *gdbarch = get_frame_arch (this_frame); 81 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); 82 CORE_ADDR rbx; 83 gdb_byte buf[8]; 84 85 /* A pointer to the ucontext is passed as the fourth argument 86 to the signal handler, which is saved in rbx. */ 87 get_frame_register (this_frame, AMD64_RBX_REGNUM, buf); 88 rbx = extract_unsigned_integer (buf, 8, byte_order); 89 90 /* The pointer to mcontext is at offset 48. */ 91 read_memory (rbx + 48, buf, 8); 92 93 /* First register (rax) is at offset 16. */ 94 return extract_unsigned_integer (buf, 8, byte_order) + 16; 95 } 96 97 static void 98 x86_darwin_init_abi_64 (struct gdbarch_info info, struct gdbarch *gdbarch) 99 { 100 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 101 102 amd64_init_abi (info, gdbarch); 103 104 tdep->struct_return = reg_struct_return; 105 106 dwarf2_frame_set_signal_frame_p (gdbarch, darwin_dwarf_signal_frame_p); 107 108 tdep->sigtramp_p = i386_sigtramp_p; 109 tdep->sigcontext_addr = amd64_darwin_sigcontext_addr; 110 tdep->sc_reg_offset = amd64_darwin_thread_state_reg_offset; 111 tdep->sc_num_regs = amd64_darwin_thread_state_num_regs; 112 113 tdep->jb_pc_offset = 56; 114 115 set_solib_ops (gdbarch, &darwin_so_ops); 116 } 117 118 /* -Wmissing-prototypes */ 119 extern initialize_file_ftype _initialize_amd64_darwin_tdep; 120 121 void 122 _initialize_amd64_darwin_tdep (void) 123 { 124 gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, 125 GDB_OSABI_DARWIN, x86_darwin_init_abi_64); 126 } 127