* sparc-tdep.c: Fix typo in comment.
[deliverable/binutils-gdb.git] / gdb / amd64nbsd-tdep.c
1 /* Target-dependent code for NetBSD/amd64.
2
3 Copyright 2003, 2004 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., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
21
22 #include "defs.h"
23 #include "arch-utils.h"
24 #include "frame.h"
25 #include "gdbcore.h"
26 #include "osabi.h"
27
28 #include "gdb_assert.h"
29
30 #include "amd64-tdep.h"
31 #include "nbsd-tdep.h"
32 #include "solib-svr4.h"
33
34 /* Support for signal handlers. */
35
36 /* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
37 routine, return the address of the associated sigcontext structure. */
38
39 static CORE_ADDR
40 amd64nbsd_sigcontext_addr (struct frame_info *next_frame)
41 {
42 CORE_ADDR sp;
43
44 /* The stack pointer points at `struct sigcontext' upon entry of a
45 signal trampoline. */
46 sp = frame_unwind_register_unsigned (next_frame, AMD64_RSP_REGNUM);
47 return sp;
48 }
49 \f
50 /* NetBSD 2.0 or later. */
51
52 /* Mapping between the general-purpose registers in `struct reg'
53 format and GDB's register cache layout. */
54
55 /* From <machine/reg.h>. */
56 int amd64nbsd_r_reg_offset[] =
57 {
58 14 * 8, /* %rax */
59 13 * 8, /* %rbx */
60 3 * 8, /* %rcx */
61 2 * 8, /* %rdx */
62 1 * 8, /* %rsi */
63 0 * 8, /* %rdi */
64 12 * 8, /* %rbp */
65 24 * 8, /* %rsp */
66 4 * 8, /* %r8 .. */
67 5 * 8,
68 6 * 8,
69 7 * 8,
70 8 * 8,
71 9 * 8,
72 10 * 8,
73 11 * 8, /* ... %r15 */
74 21 * 8, /* %rip */
75 23 * 8, /* %eflags */
76 22 * 8, /* %cs */
77 25 * 8, /* %ss */
78 18 * 8, /* %ds */
79 17 * 8, /* %es */
80 16 * 8, /* %fs */
81 15 * 8 /* %gs */
82 };
83
84 static void
85 amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
86 {
87 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
88 int *sc_reg_offset;
89 int i;
90
91 /* Initialize general-purpose register set details first. */
92 tdep->gregset_reg_offset = amd64nbsd_r_reg_offset;
93 tdep->gregset_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
94 tdep->sizeof_gregset = 26 * 8;
95
96 amd64_init_abi (info, gdbarch);
97
98 tdep->jb_pc_offset = 7 * 8;
99
100 /* NetBSD has its own convention for signal trampolines. */
101 set_gdbarch_pc_in_sigtramp (gdbarch, nbsd_pc_in_sigtramp);
102 tdep->sigcontext_addr = amd64nbsd_sigcontext_addr;
103
104 /* Initialize the array with register offsets in `struct
105 sigcontext'. This `struct sigcontext' has an sc_mcontext member
106 at offset 32, and in <machine/reg.h> we have an explicit comment
107 saying that `struct reg' is the same as mcontext.__gregs. */
108 tdep->sc_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
109 tdep->sc_reg_offset = XCALLOC (tdep->sc_num_regs, int);
110 for (i = 0; i < tdep->sc_num_regs; i++)
111 {
112 if (amd64nbsd_r_reg_offset[i] < 0)
113 tdep->sc_reg_offset[i] = -1;
114 else
115 tdep->sc_reg_offset[i] = 32 + amd64nbsd_r_reg_offset[i];
116 }
117
118 /* NetBSD uses SVR4-style shared libraries. */
119 set_solib_svr4_fetch_link_map_offsets
120 (gdbarch, svr4_lp64_fetch_link_map_offsets);
121 }
122 \f
123
124 /* Provide a prototype to silence -Wmissing-prototypes. */
125 void _initialize_amd64nbsd_tdep (void);
126
127 void
128 _initialize_amd64nbsd_ndep (void)
129 {
130 /* The NetBSD/amd64 native dependent code makes this assumption. */
131 gdb_assert (ARRAY_SIZE (amd64nbsd_r_reg_offset) == AMD64_NUM_GREGS);
132
133 gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
134 GDB_OSABI_NETBSD_ELF, amd64nbsd_init_abi);
135 }
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