1 /* Native-dependent code for DragonFly/amd64.
3 Copyright (C) 2003, 2004, 2007, 2008, 2009 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/>. */
25 #include "gdb_assert.h"
28 #include <sys/types.h>
29 #include <sys/ptrace.h>
30 #include <sys/sysctl.h>
31 #include <machine/reg.h>
34 #include "amd64-tdep.h"
35 #include "amd64-nat.h"
38 /* Offset in `struct reg' where MEMBER is stored. */
39 #define REG_OFFSET(member) offsetof (struct reg, member)
41 /* At amd64dfly64_r_reg_offset[REGNUM] you'll find the offset in
42 `struct reg' location where the GDB register REGNUM is stored.
43 Unsupported registers are marked with `-1'. */
44 static int amd64dfly64_r_reg_offset[] =
63 REG_OFFSET (r_rflags),
73 /* Mapping between the general-purpose registers in DragonFly/amd64
74 `struct reg' format and GDB's register cache layout for
77 Note that most DragonFly/amd64 registers are 64-bit, while the
78 DragonFly/i386 registers are all 32-bit, but since we're
79 little-endian we get away with that. */
81 /* From <machine/reg.h>. */
82 static int amd64dfly32_r_reg_offset[I386_NUM_GREGS] =
84 14 * 8, 13 * 8, /* %eax, %ecx */
85 12 * 8, 11 * 8, /* %edx, %ebx */
86 20 * 8, 10 * 8, /* %esp, %ebp */
87 9 * 8, 8 * 8, /* %esi, %edi */
88 17 * 8, 19 * 8, /* %eip, %eflags */
89 18 * 8, 21 * 8, /* %cs, %ss */
90 -1, -1, -1, -1 /* %ds, %es, %fs, %gs */
94 /* Provide a prototype to silence -Wmissing-prototypes. */
95 void _initialize_amd64dfly_nat (void);
98 _initialize_amd64dfly_nat (void)
100 struct target_ops *t;
103 amd64_native_gregset32_reg_offset = amd64dfly32_r_reg_offset;
104 amd64_native_gregset64_reg_offset = amd64dfly64_r_reg_offset;
106 /* Add some extra features to the common *BSD/i386 target. */
107 t = amd64bsd_target ();
108 t->to_pid_to_exec_file = fbsd_pid_to_exec_file;
109 t->to_find_memory_regions = fbsd_find_memory_regions;
110 t->to_make_corefile_notes = fbsd_make_corefile_notes;
113 /* To support the recognition of signal handlers, i386bsd-tdep.c
114 hardcodes some constants. Inclusion of this file means that we
115 are compiling a native debugger, which means that we can use the
116 system header files and sysctl(3) to get at the relevant
119 #define SC_REG_OFFSET amd64dfly_sc_reg_offset
121 /* We only check the program counter, stack pointer and frame
122 pointer since these members of `struct sigcontext' are essential
123 for providing backtraces. */
125 #define SC_RIP_OFFSET SC_REG_OFFSET[AMD64_RIP_REGNUM]
126 #define SC_RSP_OFFSET SC_REG_OFFSET[AMD64_RSP_REGNUM]
127 #define SC_RBP_OFFSET SC_REG_OFFSET[AMD64_RBP_REGNUM]
129 /* Override the default value for the offset of the program counter
130 in the sigcontext structure. */
131 offset = offsetof (struct sigcontext, sc_rip);
133 if (SC_RIP_OFFSET != offset)
136 offsetof (struct sigcontext, sc_rip) yields %d instead of %d.\n\
137 Please report this to <bug-gdb@gnu.org>."),
138 offset, SC_RIP_OFFSET);
141 SC_RIP_OFFSET = offset;
143 /* Likewise for the stack pointer. */
144 offset = offsetof (struct sigcontext, sc_rsp);
146 if (SC_RSP_OFFSET != offset)
149 offsetof (struct sigcontext, sc_rsp) yields %d instead of %d.\n\
150 Please report this to <bug-gdb@gnu.org>."),
151 offset, SC_RSP_OFFSET);
154 SC_RSP_OFFSET = offset;
156 /* And the frame pointer. */
157 offset = offsetof (struct sigcontext, sc_rbp);
159 if (SC_RBP_OFFSET != offset)
162 offsetof (struct sigcontext, sc_rbp) yields %d instead of %d.\n\
163 Please report this to <bug-gdb@gnu.org>."),
164 offset, SC_RBP_OFFSET);
167 SC_RBP_OFFSET = offset;
169 /* DragonFly provides a kern.ps_strings sysctl that we can use to
170 locate the sigtramp. That way we can still recognize a sigtramp
171 if its location is changed in a new kernel. Of course this is
172 still based on the assumption that the sigtramp is placed
173 directly under the location where the program arguments and
174 environment can be found. */
181 mib[1] = KERN_PS_STRINGS;
182 len = sizeof (ps_strings);
183 if (sysctl (mib, 2, &ps_strings, &len, NULL, 0) == 0)
185 amd64dfly_sigtramp_start_addr = ps_strings - 32;
186 amd64dfly_sigtramp_end_addr = ps_strings;