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a80b95ba | 1 | /* Darwin support for GDB, the GNU debugger. |
0fb0cc75 | 2 | Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2005, 2008, 2009 |
a80b95ba TG |
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 "amd64-tdep.h" | |
36 | #include "osabi.h" | |
37 | #include "ui-out.h" | |
38 | #include "symtab.h" | |
39 | #include "frame.h" | |
40 | #include "gdb_assert.h" | |
41 | #include "i386-darwin-tdep.h" | |
cf1061c0 TG |
42 | #include "solib.h" |
43 | #include "solib-darwin.h" | |
9f08ae4f | 44 | #include "dwarf2-frame.h" |
a80b95ba TG |
45 | |
46 | /* Offsets into the struct i386_thread_state where we'll find the saved regs. | |
47 | From <mach/i386/thread_status.h> and i386-tdep.h. */ | |
48 | int i386_darwin_thread_state_reg_offset[] = | |
49 | { | |
50 | 0 * 4, /* EAX */ | |
51 | 2 * 4, /* ECX */ | |
52 | 3 * 4, /* EDX */ | |
53 | 1 * 4, /* EBX */ | |
54 | 7 * 4, /* ESP */ | |
55 | 6 * 4, /* EBP */ | |
56 | 5 * 4, /* ESI */ | |
57 | 4 * 4, /* EDI */ | |
58 | 10 * 4, /* EIP */ | |
59 | 9 * 4, /* EFLAGS */ | |
60 | 11 * 4, /* CS */ | |
61 | 8, /* SS */ | |
62 | 12 * 4, /* DS */ | |
63 | 13 * 4, /* ES */ | |
64 | 14 * 4, /* FS */ | |
65 | 15 * 4 /* GS */ | |
66 | }; | |
67 | ||
68 | const int i386_darwin_thread_state_num_regs = | |
69 | ARRAY_SIZE (i386_darwin_thread_state_reg_offset); | |
70 | ||
71 | /* Offsets into the struct x86_thread_state64 where we'll find the saved regs. | |
72 | From <mach/i386/thread_status.h> and amd64-tdep.h. */ | |
73 | int amd64_darwin_thread_state_reg_offset[] = | |
74 | { | |
75 | 0 * 8, /* %rax */ | |
76 | 1 * 8, /* %rbx */ | |
77 | 2 * 8, /* %rcx */ | |
78 | 3 * 8, /* %rdx */ | |
79 | 5 * 8, /* %rsi */ | |
80 | 4 * 8, /* %rdi */ | |
81 | 6 * 8, /* %rbp */ | |
82 | 7 * 8, /* %rsp */ | |
83 | 8 * 8, /* %r8 ... */ | |
84 | 9 * 8, | |
85 | 10 * 8, | |
86 | 11 * 8, | |
87 | 12 * 8, | |
88 | 13 * 8, | |
89 | 14 * 8, | |
90 | 15 * 8, /* ... %r15 */ | |
91 | 16 * 8, /* %rip */ | |
92 | 17 * 8, /* %rflags */ | |
93 | 18 * 8, /* %cs */ | |
94 | -1, /* %ss */ | |
95 | -1, /* %ds */ | |
96 | -1, /* %es */ | |
97 | 19 * 8, /* %fs */ | |
98 | 20 * 8 /* %gs */ | |
99 | }; | |
100 | ||
101 | const int amd64_darwin_thread_state_num_regs = | |
102 | ARRAY_SIZE (amd64_darwin_thread_state_reg_offset); | |
103 | ||
9f08ae4f TG |
104 | /* Assuming THIS_FRAME is a Darwin sigtramp routine, return the |
105 | address of the associated sigcontext structure. */ | |
106 | ||
107 | static CORE_ADDR | |
108 | i386_darwin_sigcontext_addr (struct frame_info *this_frame) | |
109 | { | |
110 | CORE_ADDR bp; | |
111 | CORE_ADDR si; | |
112 | gdb_byte buf[4]; | |
113 | ||
114 | get_frame_register (this_frame, I386_EBP_REGNUM, buf); | |
115 | bp = extract_unsigned_integer (buf, 4); | |
116 | ||
117 | /* A pointer to the ucontext is passed as the fourth argument | |
118 | to the signal handler. */ | |
119 | read_memory (bp + 24, buf, 4); | |
120 | si = extract_unsigned_integer (buf, 4); | |
121 | ||
122 | /* The pointer to mcontext is at offset 28. */ | |
123 | read_memory (si + 28, buf, 4); | |
124 | ||
125 | /* First register (eax) is at offset 12. */ | |
126 | return extract_unsigned_integer (buf, 4) + 12; | |
127 | } | |
128 | ||
129 | static CORE_ADDR | |
130 | amd64_darwin_sigcontext_addr (struct frame_info *this_frame) | |
131 | { | |
132 | CORE_ADDR rbx; | |
133 | CORE_ADDR si; | |
134 | gdb_byte buf[8]; | |
135 | ||
136 | /* A pointer to the ucontext is passed as the fourth argument | |
137 | to the signal handler, which is saved in rbx. */ | |
138 | get_frame_register (this_frame, AMD64_RBX_REGNUM, buf); | |
139 | rbx = extract_unsigned_integer (buf, 8); | |
140 | ||
141 | /* The pointer to mcontext is at offset 48. */ | |
142 | read_memory (rbx + 48, buf, 8); | |
143 | ||
144 | /* First register (rax) is at offset 16. */ | |
145 | return extract_unsigned_integer (buf, 8) + 16; | |
146 | } | |
147 | ||
148 | /* Return true if the PC of THIS_FRAME is in a signal trampoline which | |
149 | may have DWARF-2 CFI. | |
150 | ||
151 | On Darwin, signal trampolines have DWARF-2 CFI but it has only one FDE | |
152 | that covers only the indirect call to the user handler. | |
153 | Without this function, the frame is recognized as a normal frame which is | |
154 | not expected. */ | |
155 | ||
156 | static int | |
157 | darwin_dwarf_signal_frame_p (struct gdbarch *gdbarch, | |
158 | struct frame_info *this_frame) | |
159 | { | |
160 | return i386_sigtramp_p (this_frame); | |
161 | } | |
162 | ||
a80b95ba TG |
163 | static void |
164 | i386_darwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
165 | { | |
166 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
167 | ||
168 | /* We support the SSE registers. */ | |
169 | tdep->num_xmm_regs = I386_NUM_XREGS - 1; | |
170 | set_gdbarch_num_regs (gdbarch, I386_SSE_NUM_REGS); | |
171 | ||
9f08ae4f TG |
172 | dwarf2_frame_set_signal_frame_p (gdbarch, darwin_dwarf_signal_frame_p); |
173 | ||
a80b95ba TG |
174 | tdep->struct_return = reg_struct_return; |
175 | ||
9f08ae4f TG |
176 | tdep->sigtramp_p = i386_sigtramp_p; |
177 | tdep->sigcontext_addr = i386_darwin_sigcontext_addr; | |
a80b95ba | 178 | tdep->sc_reg_offset = i386_darwin_thread_state_reg_offset; |
9f08ae4f | 179 | tdep->sc_num_regs = i386_darwin_thread_state_num_regs; |
a80b95ba TG |
180 | |
181 | tdep->jb_pc_offset = 20; | |
cf1061c0 TG |
182 | |
183 | set_solib_ops (gdbarch, &darwin_so_ops); | |
a80b95ba TG |
184 | } |
185 | ||
186 | static void | |
187 | x86_darwin_init_abi_64 (struct gdbarch_info info, struct gdbarch *gdbarch) | |
188 | { | |
189 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
190 | ||
191 | amd64_init_abi (info, gdbarch); | |
192 | ||
193 | tdep->struct_return = reg_struct_return; | |
194 | ||
9f08ae4f TG |
195 | dwarf2_frame_set_signal_frame_p (gdbarch, darwin_dwarf_signal_frame_p); |
196 | ||
197 | tdep->sigtramp_p = i386_sigtramp_p; | |
198 | tdep->sigcontext_addr = amd64_darwin_sigcontext_addr; | |
a80b95ba | 199 | tdep->sc_reg_offset = amd64_darwin_thread_state_reg_offset; |
9f08ae4f | 200 | tdep->sc_num_regs = amd64_darwin_thread_state_num_regs; |
a80b95ba TG |
201 | |
202 | tdep->jb_pc_offset = 148; | |
cf1061c0 TG |
203 | |
204 | set_solib_ops (gdbarch, &darwin_so_ops); | |
a80b95ba TG |
205 | } |
206 | ||
207 | static enum gdb_osabi | |
208 | i386_mach_o_osabi_sniffer (bfd *abfd) | |
209 | { | |
210 | if (!bfd_check_format (abfd, bfd_object)) | |
211 | return GDB_OSABI_UNKNOWN; | |
212 | ||
213 | if (bfd_get_arch (abfd) == bfd_arch_i386) | |
214 | return GDB_OSABI_DARWIN; | |
215 | ||
216 | return GDB_OSABI_UNKNOWN; | |
217 | } | |
218 | ||
219 | void | |
220 | _initialize_i386_darwin_tdep (void) | |
221 | { | |
222 | gdbarch_register_osabi_sniffer (bfd_arch_unknown, bfd_target_mach_o_flavour, | |
223 | i386_mach_o_osabi_sniffer); | |
224 | ||
225 | gdbarch_register_osabi (bfd_arch_i386, bfd_mach_i386_i386, | |
226 | GDB_OSABI_DARWIN, i386_darwin_init_abi); | |
227 | ||
228 | gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, | |
229 | GDB_OSABI_DARWIN, x86_darwin_init_abi_64); | |
230 | } |