| 1 | /* Darwin support for GDB, the GNU debugger. |
| 2 | Copyright (C) 1997-2019 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 "symtab.h" |
| 27 | #include "regcache.h" |
| 28 | #include "objfiles.h" |
| 29 | |
| 30 | #include "i387-tdep.h" |
| 31 | #include "gdbsupport/x86-xstate.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 | amd64_target_description (X86_XSTATE_SSE_MASK, true)); |
| 104 | |
| 105 | tdep->struct_return = reg_struct_return; |
| 106 | |
| 107 | dwarf2_frame_set_signal_frame_p (gdbarch, darwin_dwarf_signal_frame_p); |
| 108 | |
| 109 | tdep->sigtramp_p = i386_sigtramp_p; |
| 110 | tdep->sigcontext_addr = amd64_darwin_sigcontext_addr; |
| 111 | tdep->sc_reg_offset = amd64_darwin_thread_state_reg_offset; |
| 112 | tdep->sc_num_regs = amd64_darwin_thread_state_num_regs; |
| 113 | |
| 114 | tdep->jb_pc_offset = 56; |
| 115 | |
| 116 | set_solib_ops (gdbarch, &darwin_so_ops); |
| 117 | } |
| 118 | |
| 119 | void |
| 120 | _initialize_amd64_darwin_tdep (void) |
| 121 | { |
| 122 | gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, |
| 123 | GDB_OSABI_DARWIN, x86_darwin_init_abi_64); |
| 124 | } |