| 1 | /* Darwin support for GDB, the GNU debugger. |
| 2 | Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2005, 2008, 2009 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by Apple Computer, Inc. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "frame.h" |
| 24 | #include "inferior.h" |
| 25 | #include "gdbcore.h" |
| 26 | #include "target.h" |
| 27 | #include "floatformat.h" |
| 28 | #include "symtab.h" |
| 29 | #include "regcache.h" |
| 30 | #include "libbfd.h" |
| 31 | #include "objfiles.h" |
| 32 | |
| 33 | #include "i387-tdep.h" |
| 34 | #include "i386-tdep.h" |
| 35 | #include "osabi.h" |
| 36 | #include "ui-out.h" |
| 37 | #include "symtab.h" |
| 38 | #include "frame.h" |
| 39 | #include "gdb_assert.h" |
| 40 | #include "i386-darwin-tdep.h" |
| 41 | #include "solib.h" |
| 42 | #include "solib-darwin.h" |
| 43 | #include "dwarf2-frame.h" |
| 44 | |
| 45 | /* Offsets into the struct i386_thread_state where we'll find the saved regs. |
| 46 | From <mach/i386/thread_status.h> and i386-tdep.h. */ |
| 47 | int i386_darwin_thread_state_reg_offset[] = |
| 48 | { |
| 49 | 0 * 4, /* EAX */ |
| 50 | 2 * 4, /* ECX */ |
| 51 | 3 * 4, /* EDX */ |
| 52 | 1 * 4, /* EBX */ |
| 53 | 7 * 4, /* ESP */ |
| 54 | 6 * 4, /* EBP */ |
| 55 | 5 * 4, /* ESI */ |
| 56 | 4 * 4, /* EDI */ |
| 57 | 10 * 4, /* EIP */ |
| 58 | 9 * 4, /* EFLAGS */ |
| 59 | 11 * 4, /* CS */ |
| 60 | 8, /* SS */ |
| 61 | 12 * 4, /* DS */ |
| 62 | 13 * 4, /* ES */ |
| 63 | 14 * 4, /* FS */ |
| 64 | 15 * 4 /* GS */ |
| 65 | }; |
| 66 | |
| 67 | const int i386_darwin_thread_state_num_regs = |
| 68 | ARRAY_SIZE (i386_darwin_thread_state_reg_offset); |
| 69 | |
| 70 | /* Assuming THIS_FRAME is a Darwin sigtramp routine, return the |
| 71 | address of the associated sigcontext structure. */ |
| 72 | |
| 73 | static CORE_ADDR |
| 74 | i386_darwin_sigcontext_addr (struct frame_info *this_frame) |
| 75 | { |
| 76 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 77 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 78 | CORE_ADDR bp; |
| 79 | CORE_ADDR si; |
| 80 | gdb_byte buf[4]; |
| 81 | |
| 82 | get_frame_register (this_frame, I386_EBP_REGNUM, buf); |
| 83 | bp = extract_unsigned_integer (buf, 4, byte_order); |
| 84 | |
| 85 | /* A pointer to the ucontext is passed as the fourth argument |
| 86 | to the signal handler. */ |
| 87 | read_memory (bp + 24, buf, 4); |
| 88 | si = extract_unsigned_integer (buf, 4, byte_order); |
| 89 | |
| 90 | /* The pointer to mcontext is at offset 28. */ |
| 91 | read_memory (si + 28, buf, 4); |
| 92 | |
| 93 | /* First register (eax) is at offset 12. */ |
| 94 | return extract_unsigned_integer (buf, 4, byte_order) + 12; |
| 95 | } |
| 96 | |
| 97 | /* Return true if the PC of THIS_FRAME is in a signal trampoline which |
| 98 | may have DWARF-2 CFI. |
| 99 | |
| 100 | On Darwin, signal trampolines have DWARF-2 CFI but it has only one FDE |
| 101 | that covers only the indirect call to the user handler. |
| 102 | Without this function, the frame is recognized as a normal frame which is |
| 103 | not expected. */ |
| 104 | |
| 105 | int |
| 106 | darwin_dwarf_signal_frame_p (struct gdbarch *gdbarch, |
| 107 | struct frame_info *this_frame) |
| 108 | { |
| 109 | return i386_sigtramp_p (this_frame); |
| 110 | } |
| 111 | |
| 112 | static void |
| 113 | i386_darwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 114 | { |
| 115 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 116 | |
| 117 | /* We support the SSE registers. */ |
| 118 | tdep->num_xmm_regs = I386_NUM_XREGS - 1; |
| 119 | set_gdbarch_num_regs (gdbarch, I386_SSE_NUM_REGS); |
| 120 | |
| 121 | dwarf2_frame_set_signal_frame_p (gdbarch, darwin_dwarf_signal_frame_p); |
| 122 | |
| 123 | tdep->struct_return = reg_struct_return; |
| 124 | |
| 125 | tdep->sigtramp_p = i386_sigtramp_p; |
| 126 | tdep->sigcontext_addr = i386_darwin_sigcontext_addr; |
| 127 | tdep->sc_reg_offset = i386_darwin_thread_state_reg_offset; |
| 128 | tdep->sc_num_regs = i386_darwin_thread_state_num_regs; |
| 129 | |
| 130 | tdep->jb_pc_offset = 20; |
| 131 | |
| 132 | set_solib_ops (gdbarch, &darwin_so_ops); |
| 133 | } |
| 134 | |
| 135 | static enum gdb_osabi |
| 136 | i386_mach_o_osabi_sniffer (bfd *abfd) |
| 137 | { |
| 138 | if (!bfd_check_format (abfd, bfd_object)) |
| 139 | return GDB_OSABI_UNKNOWN; |
| 140 | |
| 141 | if (bfd_get_arch (abfd) == bfd_arch_i386) |
| 142 | return GDB_OSABI_DARWIN; |
| 143 | |
| 144 | return GDB_OSABI_UNKNOWN; |
| 145 | } |
| 146 | |
| 147 | void |
| 148 | _initialize_i386_darwin_tdep (void) |
| 149 | { |
| 150 | gdbarch_register_osabi_sniffer (bfd_arch_unknown, bfd_target_mach_o_flavour, |
| 151 | i386_mach_o_osabi_sniffer); |
| 152 | |
| 153 | gdbarch_register_osabi (bfd_arch_i386, bfd_mach_i386_i386, |
| 154 | GDB_OSABI_DARWIN, i386_darwin_init_abi); |
| 155 | } |