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68cc0bfb | 1 | /* Native-dependent code for FreeBSD/amd64. |
2a6d284d | 2 | |
32d0add0 | 3 | Copyright (C) 2003-2015 Free Software Foundation, Inc. |
68cc0bfb MK |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
68cc0bfb MK |
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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
68cc0bfb MK |
19 | |
20 | #include "defs.h" | |
21 | #include "inferior.h" | |
22 | #include "regcache.h" | |
6a5c78a3 | 23 | #include "target.h" |
68cc0bfb | 24 | |
68cc0bfb | 25 | #include <signal.h> |
68cc0bfb MK |
26 | #include <sys/types.h> |
27 | #include <sys/ptrace.h> | |
28 | #include <sys/sysctl.h> | |
cf424aef | 29 | #include <sys/user.h> |
68cc0bfb MK |
30 | #include <machine/reg.h> |
31 | ||
6a5c78a3 | 32 | #include "fbsd-nat.h" |
85be1ca6 | 33 | #include "amd64-tdep.h" |
2a6d284d | 34 | #include "amd64-nat.h" |
1916efaf | 35 | #include "amd64bsd-nat.h" |
df7e5265 | 36 | #include "x86-nat.h" |
68cc0bfb MK |
37 | \f |
38 | ||
cb461069 MK |
39 | /* Offset in `struct reg' where MEMBER is stored. */ |
40 | #define REG_OFFSET(member) offsetof (struct reg, member) | |
68cc0bfb | 41 | |
cb461069 MK |
42 | /* At amd64fbsd64_r_reg_offset[REGNUM] you'll find the offset in |
43 | `struct reg' location where the GDB register REGNUM is stored. | |
44 | Unsupported registers are marked with `-1'. */ | |
45 | static int amd64fbsd64_r_reg_offset[] = | |
68cc0bfb MK |
46 | { |
47 | REG_OFFSET (r_rax), | |
48 | REG_OFFSET (r_rbx), | |
49 | REG_OFFSET (r_rcx), | |
50 | REG_OFFSET (r_rdx), | |
51 | REG_OFFSET (r_rsi), | |
52 | REG_OFFSET (r_rdi), | |
53 | REG_OFFSET (r_rbp), | |
54 | REG_OFFSET (r_rsp), | |
55 | REG_OFFSET (r_r8), | |
56 | REG_OFFSET (r_r9), | |
57 | REG_OFFSET (r_r10), | |
58 | REG_OFFSET (r_r11), | |
59 | REG_OFFSET (r_r12), | |
60 | REG_OFFSET (r_r13), | |
61 | REG_OFFSET (r_r14), | |
62 | REG_OFFSET (r_r15), | |
63 | REG_OFFSET (r_rip), | |
64 | REG_OFFSET (r_rflags), | |
af233647 MK |
65 | REG_OFFSET (r_cs), |
66 | REG_OFFSET (r_ss), | |
68cc0bfb MK |
67 | -1, |
68 | -1, | |
69 | -1, | |
70 | -1 | |
71 | }; | |
2a6d284d MK |
72 | \f |
73 | ||
74 | /* Mapping between the general-purpose registers in FreeBSD/amd64 | |
75 | `struct reg' format and GDB's register cache layout for | |
76 | FreeBSD/i386. | |
68cc0bfb | 77 | |
2a6d284d MK |
78 | Note that most FreeBSD/amd64 registers are 64-bit, while the |
79 | FreeBSD/i386 registers are all 32-bit, but since we're | |
80 | little-endian we get away with that. */ | |
68cc0bfb | 81 | |
2a6d284d MK |
82 | /* From <machine/reg.h>. */ |
83 | static int amd64fbsd32_r_reg_offset[I386_NUM_GREGS] = | |
84 | { | |
85 | 14 * 8, 13 * 8, /* %eax, %ecx */ | |
86 | 12 * 8, 11 * 8, /* %edx, %ebx */ | |
87 | 20 * 8, 10 * 8, /* %esp, %ebp */ | |
88 | 9 * 8, 8 * 8, /* %esi, %edi */ | |
89 | 17 * 8, 19 * 8, /* %eip, %eflags */ | |
90 | 18 * 8, 21 * 8, /* %cs, %ss */ | |
91 | -1, -1, -1, -1 /* %ds, %es, %fs, %gs */ | |
92 | }; | |
68cc0bfb MK |
93 | \f |
94 | ||
315c4276 MK |
95 | /* Support for debugging kernel virtual memory images. */ |
96 | ||
315c4276 | 97 | #include <machine/pcb.h> |
1f596238 | 98 | #include <osreldate.h> |
315c4276 MK |
99 | |
100 | #include "bsd-kvm.h" | |
101 | ||
102 | static int | |
103 | amd64fbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) | |
104 | { | |
105 | /* The following is true for FreeBSD 5.2: | |
106 | ||
107 | The pcb contains %rip, %rbx, %rsp, %rbp, %r12, %r13, %r14, %r15, | |
108 | %ds, %es, %fs and %gs. This accounts for all callee-saved | |
109 | registers specified by the psABI and then some. Here %esp | |
110 | contains the stack pointer at the point just after the call to | |
111 | cpu_switch(). From this information we reconstruct the register | |
112 | state as it would like when we just returned from cpu_switch(). */ | |
113 | ||
114 | /* The stack pointer shouldn't be zero. */ | |
115 | if (pcb->pcb_rsp == 0) | |
116 | return 0; | |
117 | ||
118 | pcb->pcb_rsp += 8; | |
119 | regcache_raw_supply (regcache, AMD64_RIP_REGNUM, &pcb->pcb_rip); | |
120 | regcache_raw_supply (regcache, AMD64_RBX_REGNUM, &pcb->pcb_rbx); | |
121 | regcache_raw_supply (regcache, AMD64_RSP_REGNUM, &pcb->pcb_rsp); | |
122 | regcache_raw_supply (regcache, AMD64_RBP_REGNUM, &pcb->pcb_rbp); | |
123 | regcache_raw_supply (regcache, 12, &pcb->pcb_r12); | |
124 | regcache_raw_supply (regcache, 13, &pcb->pcb_r13); | |
125 | regcache_raw_supply (regcache, 14, &pcb->pcb_r14); | |
126 | regcache_raw_supply (regcache, 15, &pcb->pcb_r15); | |
c1dec97b | 127 | #if (__FreeBSD_version < 800075) && (__FreeBSD_kernel_version < 800075) |
ffeecffa JB |
128 | /* struct pcb provides the pcb_ds/pcb_es/pcb_fs/pcb_gs fields only |
129 | up until __FreeBSD_version 800074: The removal of these fields | |
130 | occurred on 2009-04-01 while the __FreeBSD_version number was | |
131 | bumped to 800075 on 2009-04-06. So 800075 is the closest version | |
132 | number where we should not try to access these fields. */ | |
315c4276 MK |
133 | regcache_raw_supply (regcache, AMD64_DS_REGNUM, &pcb->pcb_ds); |
134 | regcache_raw_supply (regcache, AMD64_ES_REGNUM, &pcb->pcb_es); | |
135 | regcache_raw_supply (regcache, AMD64_FS_REGNUM, &pcb->pcb_fs); | |
136 | regcache_raw_supply (regcache, AMD64_GS_REGNUM, &pcb->pcb_gs); | |
1f596238 | 137 | #endif |
315c4276 MK |
138 | |
139 | return 1; | |
140 | } | |
141 | \f | |
142 | ||
26cb8b7c PA |
143 | static void (*super_mourn_inferior) (struct target_ops *ops); |
144 | ||
145 | static void | |
146 | amd64fbsd_mourn_inferior (struct target_ops *ops) | |
147 | { | |
148 | #ifdef HAVE_PT_GETDBREGS | |
df7e5265 | 149 | x86_cleanup_dregs (); |
26cb8b7c PA |
150 | #endif |
151 | super_mourn_inferior (ops); | |
152 | } | |
153 | ||
97de3545 JB |
154 | /* Implement the to_read_description method. */ |
155 | ||
156 | static const struct target_desc * | |
157 | amd64fbsd_read_description (struct target_ops *ops) | |
158 | { | |
159 | #ifdef PT_GETXSTATE_INFO | |
160 | static int xsave_probed; | |
161 | static uint64_t xcr0; | |
162 | #endif | |
163 | struct reg regs; | |
164 | int is64; | |
165 | ||
166 | if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid), | |
167 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) | |
168 | perror_with_name (_("Couldn't get registers")); | |
169 | is64 = (regs.r_cs == GSEL (GUCODE_SEL, SEL_UPL)); | |
170 | #ifdef PT_GETXSTATE_INFO | |
171 | if (!xsave_probed) | |
172 | { | |
173 | struct ptrace_xstate_info info; | |
174 | ||
175 | if (ptrace (PT_GETXSTATE_INFO, ptid_get_pid (inferior_ptid), | |
176 | (PTRACE_TYPE_ARG3) &info, sizeof (info)) == 0) | |
177 | { | |
178 | amd64bsd_xsave_len = info.xsave_len; | |
179 | xcr0 = info.xsave_mask; | |
180 | } | |
181 | xsave_probed = 1; | |
182 | } | |
183 | ||
184 | if (amd64bsd_xsave_len != 0) | |
185 | { | |
186 | if (is64) | |
187 | return amd64_target_description (xcr0); | |
188 | else | |
189 | return i386_target_description (xcr0); | |
190 | } | |
191 | #endif | |
192 | if (is64) | |
193 | return tdesc_amd64; | |
194 | else | |
195 | return tdesc_i386; | |
196 | } | |
197 | ||
68cc0bfb MK |
198 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
199 | void _initialize_amd64fbsd_nat (void); | |
200 | ||
201 | void | |
1c671366 | 202 | _initialize_amd64fbsd_nat (void) |
68cc0bfb | 203 | { |
6a5c78a3 | 204 | struct target_ops *t; |
68cc0bfb MK |
205 | int offset; |
206 | ||
2a6d284d | 207 | amd64_native_gregset32_reg_offset = amd64fbsd32_r_reg_offset; |
cb461069 | 208 | amd64_native_gregset64_reg_offset = amd64fbsd64_r_reg_offset; |
2a6d284d | 209 | |
6a5c78a3 MK |
210 | /* Add some extra features to the common *BSD/i386 target. */ |
211 | t = amd64bsd_target (); | |
1916efaf PA |
212 | |
213 | #ifdef HAVE_PT_GETDBREGS | |
214 | ||
df7e5265 | 215 | x86_use_watchpoints (t); |
1916efaf | 216 | |
df7e5265 GB |
217 | x86_dr_low.set_control = amd64bsd_dr_set_control; |
218 | x86_dr_low.set_addr = amd64bsd_dr_set_addr; | |
219 | x86_dr_low.get_addr = amd64bsd_dr_get_addr; | |
220 | x86_dr_low.get_status = amd64bsd_dr_get_status; | |
221 | x86_dr_low.get_control = amd64bsd_dr_get_control; | |
222 | x86_set_debug_register_length (8); | |
1916efaf PA |
223 | |
224 | #endif /* HAVE_PT_GETDBREGS */ | |
225 | ||
26cb8b7c PA |
226 | super_mourn_inferior = t->to_mourn_inferior; |
227 | t->to_mourn_inferior = amd64fbsd_mourn_inferior; | |
97de3545 | 228 | t->to_read_description = amd64fbsd_read_description; |
26cb8b7c | 229 | |
8f60fe01 | 230 | fbsd_nat_add_target (t); |
6a5c78a3 MK |
231 | |
232 | /* Support debugging kernel virtual memory images. */ | |
233 | bsd_kvm_add_target (amd64fbsd_supply_pcb); | |
234 | ||
68cc0bfb MK |
235 | /* To support the recognition of signal handlers, i386bsd-tdep.c |
236 | hardcodes some constants. Inclusion of this file means that we | |
237 | are compiling a native debugger, which means that we can use the | |
238 | system header files and sysctl(3) to get at the relevant | |
239 | information. */ | |
240 | ||
68cc0bfb MK |
241 | #define SC_REG_OFFSET amd64fbsd_sc_reg_offset |
242 | ||
243 | /* We only check the program counter, stack pointer and frame | |
244 | pointer since these members of `struct sigcontext' are essential | |
245 | for providing backtraces. */ | |
246 | ||
90f90721 MK |
247 | #define SC_RIP_OFFSET SC_REG_OFFSET[AMD64_RIP_REGNUM] |
248 | #define SC_RSP_OFFSET SC_REG_OFFSET[AMD64_RSP_REGNUM] | |
249 | #define SC_RBP_OFFSET SC_REG_OFFSET[AMD64_RBP_REGNUM] | |
68cc0bfb MK |
250 | |
251 | /* Override the default value for the offset of the program counter | |
252 | in the sigcontext structure. */ | |
253 | offset = offsetof (struct sigcontext, sc_rip); | |
254 | ||
255 | if (SC_RIP_OFFSET != offset) | |
256 | { | |
edefbb7c | 257 | warning (_("\ |
68cc0bfb | 258 | offsetof (struct sigcontext, sc_rip) yields %d instead of %d.\n\ |
edefbb7c | 259 | Please report this to <bug-gdb@gnu.org>."), |
68cc0bfb MK |
260 | offset, SC_RIP_OFFSET); |
261 | } | |
262 | ||
263 | SC_RIP_OFFSET = offset; | |
264 | ||
265 | /* Likewise for the stack pointer. */ | |
266 | offset = offsetof (struct sigcontext, sc_rsp); | |
267 | ||
268 | if (SC_RSP_OFFSET != offset) | |
269 | { | |
edefbb7c | 270 | warning (_("\ |
68cc0bfb | 271 | offsetof (struct sigcontext, sc_rsp) yields %d instead of %d.\n\ |
edefbb7c | 272 | Please report this to <bug-gdb@gnu.org>."), |
68cc0bfb MK |
273 | offset, SC_RSP_OFFSET); |
274 | } | |
275 | ||
276 | SC_RSP_OFFSET = offset; | |
277 | ||
278 | /* And the frame pointer. */ | |
279 | offset = offsetof (struct sigcontext, sc_rbp); | |
280 | ||
281 | if (SC_RBP_OFFSET != offset) | |
282 | { | |
edefbb7c | 283 | warning (_("\ |
68cc0bfb | 284 | offsetof (struct sigcontext, sc_rbp) yields %d instead of %d.\n\ |
edefbb7c | 285 | Please report this to <bug-gdb@gnu.org>."), |
68cc0bfb MK |
286 | offset, SC_RBP_OFFSET); |
287 | } | |
288 | ||
289 | SC_RBP_OFFSET = offset; | |
290 | ||
cf424aef JB |
291 | #ifdef KERN_PROC_SIGTRAMP |
292 | /* Normally signal frames are detected via amd64fbsd_sigtramp_p. | |
293 | However, FreeBSD 9.2 through 10.1 do not include the page holding | |
294 | the signal code in core dumps. These releases do provide a | |
295 | kern.proc.sigtramp.<pid> sysctl that returns the location of the | |
296 | signal trampoline for a running process. We fetch the location | |
297 | of the current (gdb) process and use this to identify signal | |
298 | frames in core dumps from these releases. Note that this only | |
299 | works for core dumps of 64-bit (FreeBSD/amd64) processes and does | |
300 | not handle core dumps of 32-bit (FreeBSD/i386) processes. */ | |
68cc0bfb | 301 | { |
cf424aef JB |
302 | int mib[4]; |
303 | struct kinfo_sigtramp kst; | |
68cc0bfb MK |
304 | size_t len; |
305 | ||
68cc0bfb | 306 | mib[0] = CTL_KERN; |
cf424aef JB |
307 | mib[1] = KERN_PROC; |
308 | mib[2] = KERN_PROC_SIGTRAMP; | |
309 | mib[3] = getpid (); | |
310 | len = sizeof (kst); | |
311 | if (sysctl (mib, 4, &kst, &len, NULL, 0) == 0) | |
68cc0bfb | 312 | { |
cf424aef JB |
313 | amd64fbsd_sigtramp_start_addr = (uintptr_t) kst.ksigtramp_start; |
314 | amd64fbsd_sigtramp_end_addr = (uintptr_t) kst.ksigtramp_end; | |
68cc0bfb MK |
315 | } |
316 | } | |
cf424aef | 317 | #endif |
68cc0bfb | 318 | } |