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1 /* Target-dependent code for NetBSD/amd64.
2
3 Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
21
22 #include "defs.h"
23 #include "arch-utils.h"
24 #include "frame.h"
25 #include "gdbcore.h"
26 #include "osabi.h"
27 #include "symtab.h"
28
29 #include "gdb_assert.h"
30
31 #include "amd64-tdep.h"
32 #include "nbsd-tdep.h"
33 #include "solib-svr4.h"
34
35 /* Support for signal handlers. */
36
37 /* Return whether the frame preceding NEXT_FRAME corresponds to a
38 NetBSD sigtramp routine. */
39
40 static int
41 amd64nbsd_sigtramp_p (struct frame_info *next_frame)
42 {
43 CORE_ADDR pc = frame_pc_unwind (next_frame);
44 char *name;
45
46 find_pc_partial_function (pc, &name, NULL, NULL);
47 return nbsd_pc_in_sigtramp (pc, name);
48 }
49
50 /* Assuming NEXT_FRAME is preceded by a frame corresponding to a
51 NetBSD sigtramp routine, return the address of the associated
52 mcontext structure. */
53
54 static CORE_ADDR
55 amd64nbsd_mcontext_addr (struct frame_info *next_frame)
56 {
57 CORE_ADDR addr;
58
59 /* The register %r15 points at `struct ucontext' upon entry of a
60 signal trampoline. */
61 addr = frame_unwind_register_unsigned (next_frame, AMD64_R15_REGNUM);
62
63 /* The mcontext structure lives as offset 56 in `struct ucontext'. */
64 return addr + 56;
65 }
66 \f
67 /* NetBSD 2.0 or later. */
68
69 /* Mapping between the general-purpose registers in `struct reg'
70 format and GDB's register cache layout. */
71
72 /* From <machine/reg.h>. */
73 int amd64nbsd_r_reg_offset[] =
74 {
75 14 * 8, /* %rax */
76 13 * 8, /* %rbx */
77 3 * 8, /* %rcx */
78 2 * 8, /* %rdx */
79 1 * 8, /* %rsi */
80 0 * 8, /* %rdi */
81 12 * 8, /* %rbp */
82 24 * 8, /* %rsp */
83 4 * 8, /* %r8 .. */
84 5 * 8,
85 6 * 8,
86 7 * 8,
87 8 * 8,
88 9 * 8,
89 10 * 8,
90 11 * 8, /* ... %r15 */
91 21 * 8, /* %rip */
92 23 * 8, /* %eflags */
93 22 * 8, /* %cs */
94 25 * 8, /* %ss */
95 18 * 8, /* %ds */
96 17 * 8, /* %es */
97 16 * 8, /* %fs */
98 15 * 8 /* %gs */
99 };
100
101 static void
102 amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
103 {
104 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
105
106 /* Initialize general-purpose register set details first. */
107 tdep->gregset_reg_offset = amd64nbsd_r_reg_offset;
108 tdep->gregset_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
109 tdep->sizeof_gregset = 26 * 8;
110
111 amd64_init_abi (info, gdbarch);
112
113 tdep->jb_pc_offset = 7 * 8;
114
115 /* NetBSD has its own convention for signal trampolines. */
116 tdep->sigtramp_p = amd64nbsd_sigtramp_p;
117 tdep->sigcontext_addr = amd64nbsd_mcontext_addr;
118 tdep->sc_reg_offset = amd64nbsd_r_reg_offset;
119 tdep->sc_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
120
121 /* NetBSD uses SVR4-style shared libraries. */
122 set_solib_svr4_fetch_link_map_offsets
123 (gdbarch, svr4_lp64_fetch_link_map_offsets);
124 }
125 \f
126
127 /* Provide a prototype to silence -Wmissing-prototypes. */
128 void _initialize_amd64nbsd_tdep (void);
129
130 void
131 _initialize_amd64nbsd_ndep (void)
132 {
133 /* The NetBSD/amd64 native dependent code makes this assumption. */
134 gdb_assert (ARRAY_SIZE (amd64nbsd_r_reg_offset) == AMD64_NUM_GREGS);
135
136 gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
137 GDB_OSABI_NETBSD_ELF, amd64nbsd_init_abi);
138 }