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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 | } |