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i386-fbsd-nat.c
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1/* Native-dependent code for FreeBSD/i386.
2
3 Copyright (C) 2001-2023 Free Software Foundation, Inc.
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
9 the Free Software Foundation; either version 3 of the License, or
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
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19
20#include "defs.h"
21#include "inferior.h"
22#include "regcache.h"
23#include "target.h"
24
25#include <sys/types.h>
26#include <sys/ptrace.h>
27#include <sys/sysctl.h>
28#include <sys/user.h>
29
30#include "i386-tdep.h"
31#include "i386-fbsd-tdep.h"
32#include "i387-tdep.h"
33#include "x86-nat.h"
34#include "x86-fbsd-nat.h"
35
37{
38public:
39 void fetch_registers (struct regcache *, int) override;
40 void store_registers (struct regcache *, int) override;
41
42 const struct target_desc *read_description () override;
43
44 void resume (ptid_t, int, enum gdb_signal) override;
45};
46
48
50
51/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
52 for all registers. */
53
54void
56{
57 struct gdbarch *gdbarch = regcache->arch ();
59
62 {
63 if (regnum != -1)
64 return;
65 }
66
67#ifdef PT_GETFSBASE
68 if (regnum == -1 || regnum == I386_FSBASE_REGNUM)
69 {
70 register_t base;
71
72 if (ptrace (PT_GETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
73 perror_with_name (_("Couldn't get segment register fs_base"));
74
76 if (regnum != -1)
77 return;
78 }
79#endif
80#ifdef PT_GETGSBASE
81 if (regnum == -1 || regnum == I386_GSBASE_REGNUM)
82 {
83 register_t base;
84
85 if (ptrace (PT_GETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
86 perror_with_name (_("Couldn't get segment register gs_base"));
87
89 if (regnum != -1)
90 return;
91 }
92#endif
93
94 /* There is no i386_fxsave_supplies or i386_xsave_supplies.
95 Instead, the earlier register sets return early if the request
96 was for a specific register that was already satisified to avoid
97 fetching the FPU/XSAVE state unnecessarily. */
98
99#ifdef PT_GETXSTATE_INFO
100 if (m_xsave_info.xsave_len != 0)
101 {
102 void *xstateregs = alloca (m_xsave_info.xsave_len);
103
105 perror_with_name (_("Couldn't get extended state status"));
106
108 return;
109 }
110#endif
111 if (have_ptrace_xmmregs != 0)
112 {
114
116 perror_with_name (_("Couldn't get XMM registers"));
117
119 return;
120 }
121
122 struct fpreg fpregs;
123
124 if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
125 perror_with_name (_("Couldn't get floating point status"));
126
128}
129
130/* Store register REGNUM back into the inferior. If REGNUM is -1, do
131 this for all registers. */
132
133void
135{
136 struct gdbarch *gdbarch = regcache->arch ();
138
141 {
142 if (regnum != -1)
143 return;
144 }
145
146#ifdef PT_SETFSBASE
147 if (regnum == -1 || regnum == I386_FSBASE_REGNUM)
148 {
149 register_t base;
150
152
153 if (ptrace (PT_SETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
154 perror_with_name (_("Couldn't write segment register fs_base"));
155 if (regnum != -1)
156 return;
157 }
158#endif
159#ifdef PT_SETGSBASE
160 if (regnum == -1 || regnum == I386_GSBASE_REGNUM)
161 {
162 register_t base;
163
165
166 if (ptrace (PT_SETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
167 perror_with_name (_("Couldn't write segment register gs_base"));
168 if (regnum != -1)
169 return;
170 }
171#endif
172
173 /* There is no i386_fxsave_supplies or i386_xsave_supplies.
174 Instead, the earlier register sets return early if the request
175 was for a specific register that was already satisified to avoid
176 fetching the FPU/XSAVE state unnecessarily. */
177
178#ifdef PT_GETXSTATE_INFO
179 if (m_xsave_info.xsave_len != 0)
180 {
181 void *xstateregs = alloca (m_xsave_info.xsave_len);
182
184 perror_with_name (_("Couldn't get extended state status"));
185
187
189 m_xsave_info.xsave_len) == -1)
190 perror_with_name (_("Couldn't write extended state status"));
191 return;
192 }
193#endif
194 if (have_ptrace_xmmregs != 0)
195 {
197
199 perror_with_name (_("Couldn't get XMM registers"));
200
202
204 perror_with_name (_("Couldn't write XMM registers"));
205 return;
206 }
207
208 struct fpreg fpregs;
209
210 if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
211 perror_with_name (_("Couldn't get floating point status"));
212
214
215 if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
216 perror_with_name (_("Couldn't write floating point status"));
217}
218
219/* Resume execution of the inferior process. If STEP is nonzero,
220 single-step it. If SIGNAL is nonzero, give it that signal. */
221
222void
223i386_fbsd_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signal)
224{
225 pid_t pid = ptid.pid ();
226 int request = PT_STEP;
227
228 if (pid == -1)
229 /* Resume all threads. This only gets used in the non-threaded
230 case, where "resume all threads" and "resume inferior_ptid" are
231 the same. */
232 pid = inferior_ptid.pid ();
233
234 if (!step)
235 {
238
239 /* Workaround for a bug in FreeBSD. Make sure that the trace
240 flag is off when doing a continue. There is a code path
241 through the kernel which leaves the flag set when it should
242 have been cleared. If a process has a signal pending (such
243 as SIGALRM) and we do a PT_STEP, the process never really has
244 a chance to run because the kernel needs to notify the
245 debugger that a signal is being sent. Therefore, the process
246 never goes through the kernel's trap() function which would
247 normally clear it. */
248
250 &eflags);
251 if (eflags & 0x0100)
253 eflags & ~0x0100);
254
255 request = PT_CONTINUE;
256 }
257
258 /* An addres of (caddr_t) 1 tells ptrace to continue from where it
259 was. (If GDB wanted it to start some other way, we have already
260 written a new PC value to the child.) */
261 if (ptrace (request, pid, (caddr_t) 1,
262 gdb_signal_to_host (signal)) == -1)
263 perror_with_name (("ptrace"));
264}
265
266
267/* Support for debugging kernel virtual memory images. */
268
269#include <machine/pcb.h>
270
271#include "bsd-kvm.h"
272
273static int
274i386fbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
275{
276 /* The following is true for FreeBSD 4.7:
277
278 The pcb contains %eip, %ebx, %esp, %ebp, %esi, %edi and %gs.
279 This accounts for all callee-saved registers specified by the
280 psABI and then some. Here %esp contains the stack pointer at the
281 point just after the call to cpu_switch(). From this information
282 we reconstruct the register state as it would look when we just
283 returned from cpu_switch(). */
284
285 /* The stack pointer shouldn't be zero. */
286 if (pcb->pcb_esp == 0)
287 return 0;
288
289 pcb->pcb_esp += 4;
290 regcache->raw_supply (I386_EDI_REGNUM, &pcb->pcb_edi);
291 regcache->raw_supply (I386_ESI_REGNUM, &pcb->pcb_esi);
292 regcache->raw_supply (I386_EBP_REGNUM, &pcb->pcb_ebp);
293 regcache->raw_supply (I386_ESP_REGNUM, &pcb->pcb_esp);
294 regcache->raw_supply (I386_EBX_REGNUM, &pcb->pcb_ebx);
295 regcache->raw_supply (I386_EIP_REGNUM, &pcb->pcb_eip);
296 regcache->raw_supply (I386_GS_REGNUM, &pcb->pcb_gs);
297
298 return 1;
299}
300
301
302/* Implement the read_description method. */
303
304const struct target_desc *
306{
307 static int xmm_probed;
308
310 return this->beneath ()->read_description ();
311
312#ifdef PT_GETXSTATE_INFO
314 if (m_xsave_info.xsave_len != 0)
315 return i386_target_description (m_xsave_info.xsave_mask, true);
316#endif
317
318 if (!xmm_probed)
319 {
321
323 (PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
325 xmm_probed = 1;
326 }
327
330
332}
333
335void
337{
339
340 /* Support debugging kernel virtual memory images. */
342}
int regnum
void bsd_kvm_add_target(int(*supply_pcb)(struct regcache *, struct pcb *))
Definition bsd-kvm.c:380
bool fetch_register_set(struct regcache *regcache, int regnum, int fetch_op, const struct regset *regset, int regbase, void *regs, size_t size)
Definition fbsd-nat.c:2336
void store_registers(struct regcache *, int) override
void fetch_registers(struct regcache *, int) override
void resume(ptid_t, int, enum gdb_signal) override
const struct target_desc * read_description() override
gdbarch * arch() const
Definition regcache.c:231
void raw_collect(int regnum, void *buf) const override
Definition regcache.c:1127
void raw_supply(int regnum, const void *buf) override
Definition regcache.c:1062
ptid_t ptid() const
Definition regcache.h:408
#define PT_STEP
Definition gdb_ptrace.h:91
#define PT_CONTINUE
Definition gdb_ptrace.h:79
#define ptrace(request, pid, addr, data)
Definition gdb_ptrace.h:141
mach_port_t mach_port_t name mach_port_t mach_port_t name kern_return_t int int rusage_t pid_t pid
Definition gnu-nat.c:1791
static i386_fbsd_nat_target the_i386_fbsd_nat_target
static int i386fbsd_supply_pcb(struct regcache *regcache, struct pcb *pcb)
void _initialize_i386fbsd_nat()
static int have_ptrace_xmmregs
const struct regset i386_fbsd_gregset
const struct target_desc * i386_target_description(uint64_t xcr0, bool segments)
Definition i386-tdep.c:8957
@ I386_GSBASE_REGNUM
Definition i386-tdep.h:311
@ I386_EFLAGS_REGNUM
Definition i386-tdep.h:290
@ I386_ESI_REGNUM
Definition i386-tdep.h:287
@ I386_GS_REGNUM
Definition i386-tdep.h:296
@ I386_EIP_REGNUM
Definition i386-tdep.h:289
@ I386_EBP_REGNUM
Definition i386-tdep.h:286
@ I386_ESP_REGNUM
Definition i386-tdep.h:285
@ I386_EBX_REGNUM
Definition i386-tdep.h:284
@ I386_EDI_REGNUM
Definition i386-tdep.h:288
@ I386_FSBASE_REGNUM
Definition i386-tdep.h:310
void i387_supply_xsave(struct regcache *regcache, int regnum, const void *xsave)
Definition i387-tdep.c:1061
void i387_supply_fxsave(struct regcache *regcache, int regnum, const void *fxsave)
Definition i387-tdep.c:589
void i387_collect_fxsave(const struct regcache *regcache, int regnum, void *fxsave)
Definition i387-tdep.c:673
void i387_collect_xsave(const struct regcache *regcache, int regnum, void *xsave, int gcore)
Definition i387-tdep.c:1508
void i387_supply_fsave(struct regcache *regcache, int regnum, const void *fsave)
Definition i387-tdep.c:440
void i387_collect_fsave(const struct regcache *regcache, int regnum, void *fsave)
Definition i387-tdep.c:495
#define I387_SIZEOF_FXSAVE
Definition i387-tdep.h:119
void add_inf_child_target(inf_child_target *target)
Definition inf-child.c:418
pid_t get_ptrace_pid(ptid_t ptid)
Definition inf-ptrace.c:238
ptid_t inferior_ptid
Definition infcmd.c:74
#define PTRACE_TYPE_ARG3
enum register_status regcache_cooked_read_unsigned(struct regcache *regcache, int regnum, ULONGEST *val)
Definition regcache.c:796
struct regcache * get_current_regcache(void)
Definition regcache.c:429
void regcache_cooked_write_unsigned(struct regcache *regcache, int regnum, ULONGEST val)
Definition regcache.c:825
target_ops * beneath() const
Definition target.c:3041
virtual const struct target_desc * read_description() TARGET_DEFAULT_RETURN(NULL)