2 * Copyright (c) 2001 Alexander Kabaev
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer
10 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
36 #include <sys/mutex.h>
38 #include <sys/ptrace.h>
39 #include <sys/syscallsubr.h>
40 #include <sys/systm.h>
42 #include <machine/md_var.h>
43 #include <machine/pcb.h>
44 #include <machine/reg.h>
46 #include <i386/linux/linux.h>
47 #include <i386/linux/linux_proto.h>
48 #include <compat/linux/linux_signal.h>
50 #if !defined(CPU_DISABLE_SSE) && defined(I686_CPU)
51 #define CPU_ENABLE_SSE
55 * Linux ptrace requests numbers. Mostly identical to FreeBSD,
56 * except for MD ones and PT_ATTACH/PT_DETACH.
58 #define PTRACE_TRACEME 0
59 #define PTRACE_PEEKTEXT 1
60 #define PTRACE_PEEKDATA 2
61 #define PTRACE_PEEKUSR 3
62 #define PTRACE_POKETEXT 4
63 #define PTRACE_POKEDATA 5
64 #define PTRACE_POKEUSR 6
67 #define PTRACE_SINGLESTEP 9
69 #define PTRACE_ATTACH 16
70 #define PTRACE_DETACH 17
72 #define LINUX_PTRACE_SYSCALL 24
74 #define PTRACE_GETREGS 12
75 #define PTRACE_SETREGS 13
76 #define PTRACE_GETFPREGS 14
77 #define PTRACE_SETFPREGS 15
78 #define PTRACE_GETFPXREGS 18
79 #define PTRACE_SETFPXREGS 19
81 #define PTRACE_SETOPTIONS 21
84 * Linux keeps debug registers at the following
85 * offset in the user struct
87 #define LINUX_DBREG_OFFSET 252
88 #define LINUX_DBREG_SIZE (8*sizeof(l_int))
91 map_signum(int signum)
94 signum = linux_to_bsd_signal(signum);
95 return ((signum == SIGSTOP)? 0 : signum);
119 * Translate i386 ptrace registers between Linux and FreeBSD formats.
120 * The translation is pretty straighforward, for all registers, but
121 * orig_eax on Linux side and r_trapno and r_err in FreeBSD
124 map_regs_to_linux(struct reg *bsd_r, struct linux_pt_reg *linux_r)
126 linux_r->ebx = bsd_r->r_ebx;
127 linux_r->ecx = bsd_r->r_ecx;
128 linux_r->edx = bsd_r->r_edx;
129 linux_r->esi = bsd_r->r_esi;
130 linux_r->edi = bsd_r->r_edi;
131 linux_r->ebp = bsd_r->r_ebp;
132 linux_r->eax = bsd_r->r_eax;
133 linux_r->xds = bsd_r->r_ds;
134 linux_r->xes = bsd_r->r_es;
135 linux_r->xfs = bsd_r->r_fs;
136 linux_r->xgs = bsd_r->r_gs;
137 linux_r->orig_eax = bsd_r->r_eax;
138 linux_r->eip = bsd_r->r_eip;
139 linux_r->xcs = bsd_r->r_cs;
140 linux_r->eflags = bsd_r->r_eflags;
141 linux_r->esp = bsd_r->r_esp;
142 linux_r->xss = bsd_r->r_ss;
146 map_regs_from_linux(struct reg *bsd_r, struct linux_pt_reg *linux_r)
148 bsd_r->r_ebx = linux_r->ebx;
149 bsd_r->r_ecx = linux_r->ecx;
150 bsd_r->r_edx = linux_r->edx;
151 bsd_r->r_esi = linux_r->esi;
152 bsd_r->r_edi = linux_r->edi;
153 bsd_r->r_ebp = linux_r->ebp;
154 bsd_r->r_eax = linux_r->eax;
155 bsd_r->r_ds = linux_r->xds;
156 bsd_r->r_es = linux_r->xes;
157 bsd_r->r_fs = linux_r->xfs;
158 bsd_r->r_gs = linux_r->xgs;
159 bsd_r->r_eip = linux_r->eip;
160 bsd_r->r_cs = linux_r->xcs;
161 bsd_r->r_eflags = linux_r->eflags;
162 bsd_r->r_esp = linux_r->esp;
163 bsd_r->r_ss = linux_r->xss;
166 struct linux_pt_fpreg {
174 l_long st_space[2*10];
178 map_fpregs_to_linux(struct fpreg *bsd_r, struct linux_pt_fpreg *linux_r)
180 linux_r->cwd = bsd_r->fpr_env[0];
181 linux_r->swd = bsd_r->fpr_env[1];
182 linux_r->twd = bsd_r->fpr_env[2];
183 linux_r->fip = bsd_r->fpr_env[3];
184 linux_r->fcs = bsd_r->fpr_env[4];
185 linux_r->foo = bsd_r->fpr_env[5];
186 linux_r->fos = bsd_r->fpr_env[6];
187 bcopy(bsd_r->fpr_acc, linux_r->st_space, sizeof(linux_r->st_space));
191 map_fpregs_from_linux(struct fpreg *bsd_r, struct linux_pt_fpreg *linux_r)
193 bsd_r->fpr_env[0] = linux_r->cwd;
194 bsd_r->fpr_env[1] = linux_r->swd;
195 bsd_r->fpr_env[2] = linux_r->twd;
196 bsd_r->fpr_env[3] = linux_r->fip;
197 bsd_r->fpr_env[4] = linux_r->fcs;
198 bsd_r->fpr_env[5] = linux_r->foo;
199 bsd_r->fpr_env[6] = linux_r->fos;
200 bcopy(bsd_r->fpr_acc, linux_r->st_space, sizeof(bsd_r->fpr_acc));
203 struct linux_pt_fpxreg {
215 l_long xmm_space[32];
219 #ifdef CPU_ENABLE_SSE
221 linux_proc_read_fpxregs(struct thread *td, struct linux_pt_fpxreg *fpxregs)
224 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
225 if (cpu_fxsr == 0 || (td->td_proc->p_flag & P_INMEM) == 0)
227 bcopy(&get_pcb_user_save_td(td)->sv_xmm, fpxregs, sizeof(*fpxregs));
232 linux_proc_write_fpxregs(struct thread *td, struct linux_pt_fpxreg *fpxregs)
235 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
236 if (cpu_fxsr == 0 || (td->td_proc->p_flag & P_INMEM) == 0)
238 bcopy(fpxregs, &get_pcb_user_save_td(td)->sv_xmm, sizeof(*fpxregs));
244 linux_ptrace(struct thread *td, struct linux_ptrace_args *uap)
247 struct linux_pt_reg reg;
248 struct linux_pt_fpreg fpreg;
249 struct linux_pt_fpxreg fpxreg;
253 struct fpreg bsd_fpreg;
254 struct dbreg bsd_dbreg;
262 /* by default, just copy data intact */
264 pid = (pid_t)uap->pid;
265 addr = (void *)uap->addr;
269 case PTRACE_POKETEXT:
270 case PTRACE_POKEDATA:
272 error = kern_ptrace(td, req, pid, addr, uap->data);
274 case PTRACE_PEEKTEXT:
275 case PTRACE_PEEKDATA: {
276 /* need to preserve return value */
277 int rval = td->td_retval[0];
278 error = kern_ptrace(td, req, pid, addr, 0);
280 error = copyout(td->td_retval, (void *)uap->data,
282 td->td_retval[0] = rval;
286 error = kern_ptrace(td, PT_DETACH, pid, (void *)1,
287 map_signum(uap->data));
289 case PTRACE_SINGLESTEP:
291 error = kern_ptrace(td, req, pid, (void *)1,
292 map_signum(uap->data));
295 error = kern_ptrace(td, PT_ATTACH, pid, addr, uap->data);
298 /* Linux is using data where FreeBSD is using addr */
299 error = kern_ptrace(td, PT_GETREGS, pid, &u.bsd_reg, 0);
301 map_regs_to_linux(&u.bsd_reg, &r.reg);
302 error = copyout(&r.reg, (void *)uap->data,
307 /* Linux is using data where FreeBSD is using addr */
308 error = copyin((void *)uap->data, &r.reg, sizeof(r.reg));
310 map_regs_from_linux(&u.bsd_reg, &r.reg);
311 error = kern_ptrace(td, PT_SETREGS, pid, &u.bsd_reg, 0);
314 case PTRACE_GETFPREGS:
315 /* Linux is using data where FreeBSD is using addr */
316 error = kern_ptrace(td, PT_GETFPREGS, pid, &u.bsd_fpreg, 0);
318 map_fpregs_to_linux(&u.bsd_fpreg, &r.fpreg);
319 error = copyout(&r.fpreg, (void *)uap->data,
323 case PTRACE_SETFPREGS:
324 /* Linux is using data where FreeBSD is using addr */
325 error = copyin((void *)uap->data, &r.fpreg, sizeof(r.fpreg));
327 map_fpregs_from_linux(&u.bsd_fpreg, &r.fpreg);
328 error = kern_ptrace(td, PT_SETFPREGS, pid,
332 case PTRACE_SETFPXREGS:
333 #ifdef CPU_ENABLE_SSE
334 error = copyin((void *)uap->data, &r.fpxreg, sizeof(r.fpxreg));
339 case PTRACE_GETFPXREGS: {
340 #ifdef CPU_ENABLE_SSE
344 if (sizeof(struct linux_pt_fpxreg) != sizeof(struct savexmm)) {
347 printf("linux: savexmm != linux_pt_fpxreg\n");
354 if ((p = pfind(uap->pid)) == NULL) {
359 /* Exiting processes can't be debugged. */
360 if ((p->p_flag & P_WEXIT) != 0) {
365 if ((error = p_candebug(td, p)) != 0)
368 /* System processes can't be debugged. */
369 if ((p->p_flag & P_SYSTEM) != 0) {
374 /* not being traced... */
375 if ((p->p_flag & P_TRACED) == 0) {
380 /* not being traced by YOU */
381 if (p->p_pptr != td->td_proc) {
386 /* not currently stopped */
387 if (!P_SHOULDSTOP(p) || (p->p_flag & P_WAITED) == 0) {
392 if (req == PTRACE_GETFPXREGS) {
393 _PHOLD(p); /* may block */
394 td2 = FIRST_THREAD_IN_PROC(p);
395 error = linux_proc_read_fpxregs(td2, &r.fpxreg);
399 error = copyout(&r.fpxreg, (void *)uap->data,
402 /* clear dangerous bits exactly as Linux does*/
403 r.fpxreg.mxcsr &= 0xffbf;
404 _PHOLD(p); /* may block */
405 td2 = FIRST_THREAD_IN_PROC(p);
406 error = linux_proc_write_fpxregs(td2, &r.fpxreg);
420 case PTRACE_POKEUSR: {
423 /* check addr for alignment */
424 if (uap->addr < 0 || uap->addr & (sizeof(l_int) - 1))
427 * Allow linux programs to access register values in
428 * user struct. We simulate this through PT_GET/SETREGS
431 if (uap->addr < sizeof(struct linux_pt_reg)) {
432 error = kern_ptrace(td, PT_GETREGS, pid, &u.bsd_reg, 0);
436 map_regs_to_linux(&u.bsd_reg, &r.reg);
437 if (req == PTRACE_PEEKUSR) {
438 error = copyout((char *)&r.reg + uap->addr,
439 (void *)uap->data, sizeof(l_int));
443 *(l_int *)((char *)&r.reg + uap->addr) =
446 map_regs_from_linux(&u.bsd_reg, &r.reg);
447 error = kern_ptrace(td, PT_SETREGS, pid, &u.bsd_reg, 0);
451 * Simulate debug registers access
453 if (uap->addr >= LINUX_DBREG_OFFSET &&
454 uap->addr <= LINUX_DBREG_OFFSET + LINUX_DBREG_SIZE) {
455 error = kern_ptrace(td, PT_GETDBREGS, pid, &u.bsd_dbreg,
460 uap->addr -= LINUX_DBREG_OFFSET;
461 if (req == PTRACE_PEEKUSR) {
462 error = copyout((char *)&u.bsd_dbreg +
463 uap->addr, (void *)uap->data,
468 *(l_int *)((char *)&u.bsd_dbreg + uap->addr) =
470 error = kern_ptrace(td, PT_SETDBREGS, pid,
476 case LINUX_PTRACE_SYSCALL:
479 printf("linux: ptrace(%u, ...) not implemented\n",
480 (unsigned int)uap->req);