1 /* Target-dependent code for OpenBSD/amd64.
3 Copyright 2003, 2004 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 2 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, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
29 #include "gdb_assert.h"
30 #include "gdb_string.h"
32 #include "x86-64-tdep.h"
33 #include "i387-tdep.h"
35 /* Support for core dumps. */
38 amd64obsd_supply_regset (const struct regset *regset,
39 struct regcache *regcache, int regnum,
40 const void *regs, size_t len)
42 const struct gdbarch_tdep *tdep = regset->descr;
44 gdb_assert (len >= tdep->sizeof_gregset + I387_SIZEOF_FXSAVE);
46 i386_supply_gregset (regset, regcache, regnum, regs, tdep->sizeof_gregset);
47 x86_64_supply_fxsave (regcache, regnum, (char *)regs + tdep->sizeof_gregset);
50 static const struct regset *
51 amd64obsd_regset_from_core_section (struct gdbarch *gdbarch,
52 const char *sect_name, size_t sect_size)
54 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
56 /* OpenBSD core dumps don't use seperate register sets for the
57 general-purpose and floating-point registers. */
59 if (strcmp (sect_name, ".reg") == 0
60 && sect_size >= tdep->sizeof_gregset + I387_SIZEOF_FXSAVE)
62 if (tdep->gregset == NULL)
64 tdep->gregset = XMALLOC (struct regset);
65 tdep->gregset->descr = tdep;
66 tdep->gregset->supply_regset = amd64obsd_supply_regset;
75 /* Support for signal handlers. */
77 static const int amd64obsd_page_size = 4096;
80 amd64obsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
82 CORE_ADDR start_pc = (pc & ~(amd64obsd_page_size - 1));
83 const char sigreturn[] =
86 0x67, 0x00, 0x00, 0x00, /* movq $SYS_sigreturn, %rax */
87 0x0f, 0x05 /* syscall */
94 /* If we can't read the instructions at START_PC, return zero. */
95 buf = alloca (sizeof sigreturn);
96 if (target_read_memory (start_pc + 0x7, buf, sizeof sigreturn))
99 /* Check for sigreturn(2). */
100 if (memcmp (buf, sigreturn, sizeof sigreturn))
106 /* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
107 routine, return the address of the associated sigcontext structure. */
110 amd64obsd_sigcontext_addr (struct frame_info *next_frame)
112 /* The %rsp register points at `struct sigcontext' upon entry of a
113 signal trampoline. */
114 return frame_unwind_register_unsigned (next_frame, X86_64_RSP_REGNUM);
117 /* OpenBSD 3.5 or later. */
119 /* Mapping between the general-purpose registers in `struct reg'
120 format and GDB's register cache layout. */
122 /* From <machine/reg.h>. */
123 int amd64obsd_r_reg_offset[] =
140 11 * 8, /* ... %r15 */
142 17 * 8, /* %eflags */
151 /* From <machine/signal.h>. */
152 static int amd64obsd_sc_reg_offset[] =
169 11 * 8, /* ... %r15 */
171 23 * 8, /* %eflags */
181 amd64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
183 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
185 x86_64_init_abi (info, gdbarch);
187 /* Initialize general-purpose register set details. */
188 tdep->gregset_reg_offset = amd64obsd_r_reg_offset;
189 tdep->gregset_num_regs = ARRAY_SIZE (amd64obsd_r_reg_offset);
190 tdep->sizeof_gregset = 24 * 8;
192 set_gdbarch_regset_from_core_section (gdbarch,
193 amd64obsd_regset_from_core_section);
195 tdep->jb_pc_offset = 7 * 8;
197 set_gdbarch_pc_in_sigtramp (gdbarch, amd64obsd_pc_in_sigtramp);
198 tdep->sigcontext_addr = amd64obsd_sigcontext_addr;
199 tdep->sc_reg_offset = amd64obsd_sc_reg_offset;
200 tdep->sc_num_regs = ARRAY_SIZE (amd64obsd_sc_reg_offset);
204 /* Provide a prototype to silence -Wmissing-prototypes. */
205 void _initialize_amd64obsd_tdep (void);
208 _initialize_amd64obsd_tdep (void)
210 /* The OpenBSD/amd64 native dependent code makes this assumption. */
211 gdb_assert (ARRAY_SIZE (amd64obsd_r_reg_offset) == X86_64_NUM_GREGS);
213 gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
214 GDB_OSABI_OPENBSD_ELF, amd64obsd_init_abi);
216 /* OpenBSD uses traditional (a.out) NetBSD-style core dumps. */
217 gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
218 GDB_OSABI_NETBSD_AOUT, amd64obsd_init_abi);