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68cc0bfb | 1 | /* Native-dependent code for FreeBSD/amd64. |
2a6d284d | 2 | |
e2882c85 | 3 | Copyright (C) 2003-2018 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" |
03b62bbb | 35 | #include "x86-bsd-nat.h" |
df7e5265 | 36 | #include "x86-nat.h" |
26562e73 | 37 | #include "x86-xstate.h" |
68cc0bfb MK |
38 | \f |
39 | ||
cb461069 MK |
40 | /* Offset in `struct reg' where MEMBER is stored. */ |
41 | #define REG_OFFSET(member) offsetof (struct reg, member) | |
68cc0bfb | 42 | |
cb461069 MK |
43 | /* At amd64fbsd64_r_reg_offset[REGNUM] you'll find the offset in |
44 | `struct reg' location where the GDB register REGNUM is stored. | |
45 | Unsupported registers are marked with `-1'. */ | |
46 | static int amd64fbsd64_r_reg_offset[] = | |
68cc0bfb MK |
47 | { |
48 | REG_OFFSET (r_rax), | |
49 | REG_OFFSET (r_rbx), | |
50 | REG_OFFSET (r_rcx), | |
51 | REG_OFFSET (r_rdx), | |
52 | REG_OFFSET (r_rsi), | |
53 | REG_OFFSET (r_rdi), | |
54 | REG_OFFSET (r_rbp), | |
55 | REG_OFFSET (r_rsp), | |
56 | REG_OFFSET (r_r8), | |
57 | REG_OFFSET (r_r9), | |
58 | REG_OFFSET (r_r10), | |
59 | REG_OFFSET (r_r11), | |
60 | REG_OFFSET (r_r12), | |
61 | REG_OFFSET (r_r13), | |
62 | REG_OFFSET (r_r14), | |
63 | REG_OFFSET (r_r15), | |
64 | REG_OFFSET (r_rip), | |
65 | REG_OFFSET (r_rflags), | |
af233647 MK |
66 | REG_OFFSET (r_cs), |
67 | REG_OFFSET (r_ss), | |
68cc0bfb MK |
68 | -1, |
69 | -1, | |
70 | -1, | |
71 | -1 | |
72 | }; | |
2a6d284d MK |
73 | \f |
74 | ||
75 | /* Mapping between the general-purpose registers in FreeBSD/amd64 | |
76 | `struct reg' format and GDB's register cache layout for | |
77 | FreeBSD/i386. | |
68cc0bfb | 78 | |
2a6d284d MK |
79 | Note that most FreeBSD/amd64 registers are 64-bit, while the |
80 | FreeBSD/i386 registers are all 32-bit, but since we're | |
81 | little-endian we get away with that. */ | |
68cc0bfb | 82 | |
2a6d284d MK |
83 | /* From <machine/reg.h>. */ |
84 | static int amd64fbsd32_r_reg_offset[I386_NUM_GREGS] = | |
85 | { | |
86 | 14 * 8, 13 * 8, /* %eax, %ecx */ | |
87 | 12 * 8, 11 * 8, /* %edx, %ebx */ | |
88 | 20 * 8, 10 * 8, /* %esp, %ebp */ | |
89 | 9 * 8, 8 * 8, /* %esi, %edi */ | |
90 | 17 * 8, 19 * 8, /* %eip, %eflags */ | |
91 | 18 * 8, 21 * 8, /* %cs, %ss */ | |
92 | -1, -1, -1, -1 /* %ds, %es, %fs, %gs */ | |
93 | }; | |
68cc0bfb MK |
94 | \f |
95 | ||
315c4276 MK |
96 | /* Support for debugging kernel virtual memory images. */ |
97 | ||
315c4276 | 98 | #include <machine/pcb.h> |
1f596238 | 99 | #include <osreldate.h> |
315c4276 MK |
100 | |
101 | #include "bsd-kvm.h" | |
102 | ||
103 | static int | |
104 | amd64fbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) | |
105 | { | |
106 | /* The following is true for FreeBSD 5.2: | |
107 | ||
108 | The pcb contains %rip, %rbx, %rsp, %rbp, %r12, %r13, %r14, %r15, | |
109 | %ds, %es, %fs and %gs. This accounts for all callee-saved | |
110 | registers specified by the psABI and then some. Here %esp | |
111 | contains the stack pointer at the point just after the call to | |
112 | cpu_switch(). From this information we reconstruct the register | |
113 | state as it would like when we just returned from cpu_switch(). */ | |
114 | ||
115 | /* The stack pointer shouldn't be zero. */ | |
116 | if (pcb->pcb_rsp == 0) | |
117 | return 0; | |
118 | ||
119 | pcb->pcb_rsp += 8; | |
120 | regcache_raw_supply (regcache, AMD64_RIP_REGNUM, &pcb->pcb_rip); | |
121 | regcache_raw_supply (regcache, AMD64_RBX_REGNUM, &pcb->pcb_rbx); | |
122 | regcache_raw_supply (regcache, AMD64_RSP_REGNUM, &pcb->pcb_rsp); | |
123 | regcache_raw_supply (regcache, AMD64_RBP_REGNUM, &pcb->pcb_rbp); | |
124 | regcache_raw_supply (regcache, 12, &pcb->pcb_r12); | |
125 | regcache_raw_supply (regcache, 13, &pcb->pcb_r13); | |
126 | regcache_raw_supply (regcache, 14, &pcb->pcb_r14); | |
127 | regcache_raw_supply (regcache, 15, &pcb->pcb_r15); | |
c1dec97b | 128 | #if (__FreeBSD_version < 800075) && (__FreeBSD_kernel_version < 800075) |
ffeecffa JB |
129 | /* struct pcb provides the pcb_ds/pcb_es/pcb_fs/pcb_gs fields only |
130 | up until __FreeBSD_version 800074: The removal of these fields | |
131 | occurred on 2009-04-01 while the __FreeBSD_version number was | |
132 | bumped to 800075 on 2009-04-06. So 800075 is the closest version | |
133 | number where we should not try to access these fields. */ | |
315c4276 MK |
134 | regcache_raw_supply (regcache, AMD64_DS_REGNUM, &pcb->pcb_ds); |
135 | regcache_raw_supply (regcache, AMD64_ES_REGNUM, &pcb->pcb_es); | |
136 | regcache_raw_supply (regcache, AMD64_FS_REGNUM, &pcb->pcb_fs); | |
137 | regcache_raw_supply (regcache, AMD64_GS_REGNUM, &pcb->pcb_gs); | |
1f596238 | 138 | #endif |
315c4276 MK |
139 | |
140 | return 1; | |
141 | } | |
142 | \f | |
143 | ||
97de3545 JB |
144 | /* Implement the to_read_description method. */ |
145 | ||
146 | static const struct target_desc * | |
147 | amd64fbsd_read_description (struct target_ops *ops) | |
148 | { | |
149 | #ifdef PT_GETXSTATE_INFO | |
150 | static int xsave_probed; | |
151 | static uint64_t xcr0; | |
152 | #endif | |
153 | struct reg regs; | |
154 | int is64; | |
155 | ||
156 | if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid), | |
157 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) | |
158 | perror_with_name (_("Couldn't get registers")); | |
159 | is64 = (regs.r_cs == GSEL (GUCODE_SEL, SEL_UPL)); | |
160 | #ifdef PT_GETXSTATE_INFO | |
161 | if (!xsave_probed) | |
162 | { | |
163 | struct ptrace_xstate_info info; | |
164 | ||
165 | if (ptrace (PT_GETXSTATE_INFO, ptid_get_pid (inferior_ptid), | |
166 | (PTRACE_TYPE_ARG3) &info, sizeof (info)) == 0) | |
167 | { | |
a3405d12 | 168 | x86bsd_xsave_len = info.xsave_len; |
97de3545 JB |
169 | xcr0 = info.xsave_mask; |
170 | } | |
171 | xsave_probed = 1; | |
172 | } | |
173 | ||
a3405d12 | 174 | if (x86bsd_xsave_len != 0) |
97de3545 JB |
175 | { |
176 | if (is64) | |
177 | return amd64_target_description (xcr0); | |
178 | else | |
179 | return i386_target_description (xcr0); | |
180 | } | |
181 | #endif | |
182 | if (is64) | |
2434b019 | 183 | return amd64_target_description (X86_XSTATE_SSE_MASK); |
97de3545 | 184 | else |
ca1fa5ee | 185 | return i386_target_description (X86_XSTATE_SSE_MASK); |
97de3545 JB |
186 | } |
187 | ||
68cc0bfb | 188 | void |
1c671366 | 189 | _initialize_amd64fbsd_nat (void) |
68cc0bfb | 190 | { |
6a5c78a3 | 191 | struct target_ops *t; |
68cc0bfb MK |
192 | int offset; |
193 | ||
2a6d284d | 194 | amd64_native_gregset32_reg_offset = amd64fbsd32_r_reg_offset; |
cb461069 | 195 | amd64_native_gregset64_reg_offset = amd64fbsd64_r_reg_offset; |
2a6d284d | 196 | |
6a5c78a3 MK |
197 | /* Add some extra features to the common *BSD/i386 target. */ |
198 | t = amd64bsd_target (); | |
97de3545 | 199 | t->to_read_description = amd64fbsd_read_description; |
26cb8b7c | 200 | |
8f60fe01 | 201 | fbsd_nat_add_target (t); |
6a5c78a3 MK |
202 | |
203 | /* Support debugging kernel virtual memory images. */ | |
204 | bsd_kvm_add_target (amd64fbsd_supply_pcb); | |
205 | ||
03b62bbb | 206 | /* To support the recognition of signal handlers, i386-bsd-tdep.c |
68cc0bfb MK |
207 | hardcodes some constants. Inclusion of this file means that we |
208 | are compiling a native debugger, which means that we can use the | |
209 | system header files and sysctl(3) to get at the relevant | |
210 | information. */ | |
211 | ||
68cc0bfb MK |
212 | #define SC_REG_OFFSET amd64fbsd_sc_reg_offset |
213 | ||
214 | /* We only check the program counter, stack pointer and frame | |
215 | pointer since these members of `struct sigcontext' are essential | |
216 | for providing backtraces. */ | |
217 | ||
90f90721 MK |
218 | #define SC_RIP_OFFSET SC_REG_OFFSET[AMD64_RIP_REGNUM] |
219 | #define SC_RSP_OFFSET SC_REG_OFFSET[AMD64_RSP_REGNUM] | |
220 | #define SC_RBP_OFFSET SC_REG_OFFSET[AMD64_RBP_REGNUM] | |
68cc0bfb MK |
221 | |
222 | /* Override the default value for the offset of the program counter | |
223 | in the sigcontext structure. */ | |
224 | offset = offsetof (struct sigcontext, sc_rip); | |
225 | ||
226 | if (SC_RIP_OFFSET != offset) | |
227 | { | |
edefbb7c | 228 | warning (_("\ |
68cc0bfb | 229 | offsetof (struct sigcontext, sc_rip) yields %d instead of %d.\n\ |
edefbb7c | 230 | Please report this to <bug-gdb@gnu.org>."), |
68cc0bfb MK |
231 | offset, SC_RIP_OFFSET); |
232 | } | |
233 | ||
234 | SC_RIP_OFFSET = offset; | |
235 | ||
236 | /* Likewise for the stack pointer. */ | |
237 | offset = offsetof (struct sigcontext, sc_rsp); | |
238 | ||
239 | if (SC_RSP_OFFSET != offset) | |
240 | { | |
edefbb7c | 241 | warning (_("\ |
68cc0bfb | 242 | offsetof (struct sigcontext, sc_rsp) yields %d instead of %d.\n\ |
edefbb7c | 243 | Please report this to <bug-gdb@gnu.org>."), |
68cc0bfb MK |
244 | offset, SC_RSP_OFFSET); |
245 | } | |
246 | ||
247 | SC_RSP_OFFSET = offset; | |
248 | ||
249 | /* And the frame pointer. */ | |
250 | offset = offsetof (struct sigcontext, sc_rbp); | |
251 | ||
252 | if (SC_RBP_OFFSET != offset) | |
253 | { | |
edefbb7c | 254 | warning (_("\ |
68cc0bfb | 255 | offsetof (struct sigcontext, sc_rbp) yields %d instead of %d.\n\ |
edefbb7c | 256 | Please report this to <bug-gdb@gnu.org>."), |
68cc0bfb MK |
257 | offset, SC_RBP_OFFSET); |
258 | } | |
259 | ||
260 | SC_RBP_OFFSET = offset; | |
261 | ||
cf424aef JB |
262 | #ifdef KERN_PROC_SIGTRAMP |
263 | /* Normally signal frames are detected via amd64fbsd_sigtramp_p. | |
264 | However, FreeBSD 9.2 through 10.1 do not include the page holding | |
265 | the signal code in core dumps. These releases do provide a | |
266 | kern.proc.sigtramp.<pid> sysctl that returns the location of the | |
267 | signal trampoline for a running process. We fetch the location | |
268 | of the current (gdb) process and use this to identify signal | |
269 | frames in core dumps from these releases. Note that this only | |
270 | works for core dumps of 64-bit (FreeBSD/amd64) processes and does | |
271 | not handle core dumps of 32-bit (FreeBSD/i386) processes. */ | |
68cc0bfb | 272 | { |
cf424aef JB |
273 | int mib[4]; |
274 | struct kinfo_sigtramp kst; | |
68cc0bfb MK |
275 | size_t len; |
276 | ||
68cc0bfb | 277 | mib[0] = CTL_KERN; |
cf424aef JB |
278 | mib[1] = KERN_PROC; |
279 | mib[2] = KERN_PROC_SIGTRAMP; | |
280 | mib[3] = getpid (); | |
281 | len = sizeof (kst); | |
282 | if (sysctl (mib, 4, &kst, &len, NULL, 0) == 0) | |
68cc0bfb | 283 | { |
cf424aef JB |
284 | amd64fbsd_sigtramp_start_addr = (uintptr_t) kst.ksigtramp_start; |
285 | amd64fbsd_sigtramp_end_addr = (uintptr_t) kst.ksigtramp_end; | |
68cc0bfb MK |
286 | } |
287 | } | |
cf424aef | 288 | #endif |
68cc0bfb | 289 | } |