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[binutils-gdb.git] / gdb / amd64-netbsd-tdep.c
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1 /* Target-dependent code for NetBSD/amd64.
3 Copyright (C) 2003-2022 Free Software Foundation, Inc.
5 This file is part of GDB.
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 3 of the License, or
10 (at your option) any later version.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "defs.h"
21 #include "arch-utils.h"
22 #include "frame.h"
23 #include "gdbcore.h"
24 #include "osabi.h"
25 #include "symtab.h"
27 #include "amd64-tdep.h"
28 #include "gdbsupport/x86-xstate.h"
29 #include "netbsd-tdep.h"
30 #include "solib-svr4.h"
32 /* Support for signal handlers. */
34 /* Return whether THIS_FRAME corresponds to a NetBSD sigtramp
35 routine. */
37 static int
38 amd64nbsd_sigtramp_p (struct frame_info *this_frame)
40 CORE_ADDR pc = get_frame_pc (this_frame);
41 const char *name;
43 find_pc_partial_function (pc, &name, NULL, NULL);
44 return nbsd_pc_in_sigtramp (pc, name);
47 /* Assuming THIS_FRAME corresponds to a NetBSD sigtramp routine,
48 return the address of the associated mcontext structure. */
50 static CORE_ADDR
51 amd64nbsd_mcontext_addr (struct frame_info *this_frame)
53 CORE_ADDR addr;
55 /* The register %r15 points at `struct ucontext' upon entry of a
56 signal trampoline. */
57 addr = get_frame_register_unsigned (this_frame, AMD64_R15_REGNUM);
59 /* The mcontext structure lives as offset 56 in `struct ucontext'. */
60 return addr + 56;
63 /* NetBSD 2.0 or later. */
65 /* Mapping between the general-purpose registers in `struct reg'
66 format and GDB's register cache layout. */
68 /* From <machine/reg.h>. */
69 int amd64nbsd_r_reg_offset[] =
71 14 * 8, /* %rax */
72 13 * 8, /* %rbx */
73 3 * 8, /* %rcx */
74 2 * 8, /* %rdx */
75 1 * 8, /* %rsi */
76 0 * 8, /* %rdi */
77 12 * 8, /* %rbp */
78 24 * 8, /* %rsp */
79 4 * 8, /* %r8 .. */
80 5 * 8,
81 6 * 8,
82 7 * 8,
83 8 * 8,
84 9 * 8,
85 10 * 8,
86 11 * 8, /* ... %r15 */
87 21 * 8, /* %rip */
88 23 * 8, /* %eflags */
89 22 * 8, /* %cs */
90 25 * 8, /* %ss */
91 18 * 8, /* %ds */
92 17 * 8, /* %es */
93 16 * 8, /* %fs */
94 15 * 8 /* %gs */
97 static void
98 amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
100 i386_gdbarch_tdep *tdep = gdbarch_tdep<i386_gdbarch_tdep> (gdbarch);
102 /* Initialize general-purpose register set details first. */
103 tdep->gregset_reg_offset = amd64nbsd_r_reg_offset;
104 tdep->gregset_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
105 tdep->sizeof_gregset = 26 * 8;
107 amd64_init_abi (info, gdbarch,
108 amd64_target_description (X86_XSTATE_SSE_MASK, true));
109 nbsd_init_abi (info, gdbarch);
111 tdep->jb_pc_offset = 7 * 8;
113 /* NetBSD has its own convention for signal trampolines. */
114 tdep->sigtramp_p = amd64nbsd_sigtramp_p;
115 tdep->sigcontext_addr = amd64nbsd_mcontext_addr;
116 tdep->sc_reg_offset = amd64nbsd_r_reg_offset;
117 tdep->sc_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
119 /* NetBSD uses SVR4-style shared libraries. */
120 set_solib_svr4_fetch_link_map_offsets
121 (gdbarch, svr4_lp64_fetch_link_map_offsets);
124 void _initialize_amd64nbsd_tdep ();
125 void
126 _initialize_amd64nbsd_tdep ()
128 /* The NetBSD/amd64 native dependent code makes this assumption. */
129 gdb_assert (ARRAY_SIZE (amd64nbsd_r_reg_offset) == AMD64_NUM_GREGS);
131 gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
132 GDB_OSABI_NETBSD, amd64nbsd_init_abi);