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.
28 * $FreeBSD: src/sys/i386/linux/linux_ptrace.c,v 1.7.4.3 2003/01/03 17:13:23 kan Exp $
29 * $DragonFly: src/sys/emulation/linux/i386/linux_ptrace.c,v 1.15 2007/02/19 01:14:23 corecode Exp $
34 #include <sys/param.h>
37 #include <sys/ptrace.h>
38 #include <sys/systm.h>
42 #include <vm/vm_map.h>
46 #include <sys/mplock2.h>
48 #include <machine/md_var.h>
49 #include <machine/pcb.h>
52 #include "linux_proto.h"
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 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 if (signum > 0 && signum <= LINUX_SIGTBLSZ)
95 signum = linux_to_bsd_signal[_SIG_IDX(signum)];
96 return ((signum == SIGSTOP)? 0 : signum);
120 * Translate i386 ptrace registers between Linux and FreeBSD formats.
121 * The translation is pretty straighforward, for all registers, but
122 * orig_eax on Linux side and r_trapno and r_err in FreeBSD
125 map_regs_to_linux(struct reg *bsd_r, struct linux_pt_reg *linux_r)
127 linux_r->ebx = bsd_r->r_ebx;
128 linux_r->ecx = bsd_r->r_ecx;
129 linux_r->edx = bsd_r->r_edx;
130 linux_r->esi = bsd_r->r_esi;
131 linux_r->edi = bsd_r->r_edi;
132 linux_r->ebp = bsd_r->r_ebp;
133 linux_r->eax = bsd_r->r_eax;
134 linux_r->xds = bsd_r->r_ds;
135 linux_r->xes = bsd_r->r_es;
136 linux_r->xfs = bsd_r->r_fs;
137 linux_r->xgs = bsd_r->r_gs;
138 linux_r->orig_eax = bsd_r->r_eax;
139 linux_r->eip = bsd_r->r_eip;
140 linux_r->xcs = bsd_r->r_cs;
141 linux_r->eflags = bsd_r->r_eflags;
142 linux_r->esp = bsd_r->r_esp;
143 linux_r->xss = bsd_r->r_ss;
147 map_regs_from_linux(struct reg *bsd_r, struct linux_pt_reg *linux_r)
149 bsd_r->r_ebx = linux_r->ebx;
150 bsd_r->r_ecx = linux_r->ecx;
151 bsd_r->r_edx = linux_r->edx;
152 bsd_r->r_esi = linux_r->esi;
153 bsd_r->r_edi = linux_r->edi;
154 bsd_r->r_ebp = linux_r->ebp;
155 bsd_r->r_eax = linux_r->eax;
156 bsd_r->r_ds = linux_r->xds;
157 bsd_r->r_es = linux_r->xes;
158 bsd_r->r_fs = linux_r->xfs;
159 bsd_r->r_gs = linux_r->xgs;
160 bsd_r->r_eip = linux_r->eip;
161 bsd_r->r_cs = linux_r->xcs;
162 bsd_r->r_eflags = linux_r->eflags;
163 bsd_r->r_esp = linux_r->esp;
164 bsd_r->r_ss = linux_r->xss;
167 struct linux_pt_fpreg {
175 l_long st_space[2*10];
179 map_fpregs_to_linux(struct fpreg *bsd_r, struct linux_pt_fpreg *linux_r)
181 linux_r->cwd = bsd_r->fpr_env[0];
182 linux_r->swd = bsd_r->fpr_env[1];
183 linux_r->twd = bsd_r->fpr_env[2];
184 linux_r->fip = bsd_r->fpr_env[3];
185 linux_r->fcs = bsd_r->fpr_env[4];
186 linux_r->foo = bsd_r->fpr_env[5];
187 linux_r->fos = bsd_r->fpr_env[6];
188 bcopy(bsd_r->fpr_acc, linux_r->st_space, sizeof(linux_r->st_space));
192 map_fpregs_from_linux(struct fpreg *bsd_r, struct linux_pt_fpreg *linux_r)
194 bsd_r->fpr_env[0] = linux_r->cwd;
195 bsd_r->fpr_env[1] = linux_r->swd;
196 bsd_r->fpr_env[2] = linux_r->twd;
197 bsd_r->fpr_env[3] = linux_r->fip;
198 bsd_r->fpr_env[4] = linux_r->fcs;
199 bsd_r->fpr_env[5] = linux_r->foo;
200 bsd_r->fpr_env[6] = linux_r->fos;
201 bcopy(bsd_r->fpr_acc, linux_r->st_space, sizeof(bsd_r->fpr_acc));
204 struct linux_pt_fpxreg {
216 l_long xmm_space[32];
220 #ifndef CPU_DISABLE_SSE
222 linux_proc_read_fpxregs(struct lwp *lp, struct linux_pt_fpxreg *fpxregs)
230 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm,
231 fpxregs, sizeof(*fpxregs));
236 linux_proc_write_fpxregs(struct lwp *lp, struct linux_pt_fpxreg *fpxregs)
244 bcopy(fpxregs, &lp->lwp_thread->td_pcb->pcb_save.sv_xmm,
254 sys_linux_ptrace(struct linux_ptrace_args *uap)
256 struct thread *td = curthread;
257 struct proc *curp = td->td_proc;
259 struct linux_pt_reg reg;
260 struct linux_pt_fpreg fpreg;
261 struct linux_pt_fpxreg fpxreg;
265 struct fpreg bsd_fpreg;
266 struct dbreg bsd_dbreg;
274 /* by default, just copy data intact */
276 pid = (pid_t)uap->pid;
277 addr = (void *)uap->addr;
283 case PTRACE_POKETEXT:
284 case PTRACE_POKEDATA:
286 error = kern_ptrace(curp, req, pid, addr, uap->data,
287 &uap->sysmsg_iresult);
289 case PTRACE_PEEKTEXT:
290 case PTRACE_PEEKDATA: {
291 /* need to preserve return value, use dummy */
293 error = kern_ptrace(curp, req, pid, addr, 0, &rval);
295 error = copyout(&rval, (caddr_t)uap->data, sizeof(l_int));
300 error = kern_ptrace(curp, PT_DETACH, pid, (void *)1,
301 map_signum(uap->data),
302 &uap->sysmsg_iresult);
304 case PTRACE_SINGLESTEP:
306 error = kern_ptrace(curp, req, pid, (void *)1,
307 map_signum(uap->data),
308 &uap->sysmsg_iresult);
311 error = kern_ptrace(curp, PT_ATTACH, pid, addr, uap->data,
312 &uap->sysmsg_iresult);
315 /* Linux is using data where FreeBSD is using addr */
316 error = kern_ptrace(curp, PT_GETREGS, pid, &u.bsd_reg, 0,
317 &uap->sysmsg_iresult);
319 map_regs_to_linux(&u.bsd_reg, &r.reg);
320 error = copyout(&r.reg, (void *)uap->data,
325 /* Linux is using data where FreeBSD is using addr */
326 error = copyin((caddr_t)uap->data, &r.reg, sizeof(r.reg));
328 map_regs_from_linux(&u.bsd_reg, &r.reg);
329 error = kern_ptrace(curp, PT_SETREGS, pid, &u.bsd_reg,
330 0, &uap->sysmsg_iresult);
333 case PTRACE_GETFPREGS:
334 /* Linux is using data where FreeBSD is using addr */
335 error = kern_ptrace(curp, PT_GETFPREGS, pid, &u.bsd_fpreg,
336 0, &uap->sysmsg_iresult);
338 map_fpregs_to_linux(&u.bsd_fpreg, &r.fpreg);
339 error = copyout(&r.fpreg, (caddr_t)uap->data,
343 case PTRACE_SETFPREGS:
344 /* Linux is using data where FreeBSD is using addr */
345 error = copyin((caddr_t)uap->data, &r.fpreg, sizeof(r.fpreg));
347 map_fpregs_from_linux(&u.bsd_fpreg, &r.fpreg);
348 error = kern_ptrace(curp, PT_SETFPREGS, pid,
350 0, &uap->sysmsg_iresult);
353 case PTRACE_SETFPXREGS:
354 #ifndef CPU_DISABLE_SSE
355 error = copyin((caddr_t)uap->data, &r.fpxreg,
361 case PTRACE_GETFPXREGS: {
362 #ifndef CPU_DISABLE_SSE
366 if (sizeof(struct linux_pt_fpxreg) != sizeof(struct savexmm)) {
369 kprintf("linux: savexmm != linux_pt_fpxreg\n");
376 if ((p = pfind(uap->pid)) == NULL) {
381 if (!PRISON_CHECK(curp->p_ucred, p->p_ucred)) {
386 /* System processes can't be debugged. */
387 if ((p->p_flag & P_SYSTEM) != 0) {
392 /* not being traced... */
393 if ((p->p_flag & P_TRACED) == 0) {
398 /* not being traced by YOU */
399 if (p->p_pptr != curp) {
404 /* not currently stopped */
405 if ((p->p_flag & (P_TRACED|P_WAITED)) == 0) {
411 lp = FIRST_LWP_IN_PROC(p);
413 if (req == PTRACE_GETFPXREGS) {
415 error = linux_proc_read_fpxregs(lp, &r.fpxreg);
418 error = copyout(&r.fpxreg, (caddr_t)uap->data,
421 /* clear dangerous bits exactly as Linux does*/
422 r.fpxreg.mxcsr &= 0xffbf;
424 error = linux_proc_write_fpxregs(lp, &r.fpxreg);
436 case PTRACE_POKEUSR: {
439 /* check addr for alignment */
440 if (uap->addr < 0 || uap->addr & (sizeof(l_int) - 1))
443 * Allow linux programs to access register values in
444 * user struct. We simulate this through PT_GET/SETREGS
447 if (uap->addr < sizeof(struct linux_pt_reg)) {
448 error = kern_ptrace(curp, PT_GETREGS, pid, &u.bsd_reg,
449 0, &uap->sysmsg_iresult);
453 map_regs_to_linux(&u.bsd_reg, &r.reg);
454 if (req == PTRACE_PEEKUSR) {
455 error = copyout((char *)&r.reg + uap->addr,
456 (caddr_t)uap->data, sizeof(l_int));
460 *(l_int *)((char *)&r.reg + uap->addr) =
463 map_regs_from_linux(&u.bsd_reg, &r.reg);
464 error = kern_ptrace(curp, PT_SETREGS, pid, &u.bsd_reg,
465 0, &uap->sysmsg_iresult);
469 * Simulate debug registers access
471 if (uap->addr >= LINUX_DBREG_OFFSET &&
472 uap->addr <= LINUX_DBREG_OFFSET + LINUX_DBREG_SIZE) {
473 error = kern_ptrace(curp, PT_GETDBREGS, pid,
475 0, &uap->sysmsg_iresult);
479 uap->addr -= LINUX_DBREG_OFFSET;
480 if (req == PTRACE_PEEKUSR) {
481 error = copyout((char *)&u.bsd_dbreg +
482 uap->addr, (caddr_t)uap->data,
487 *(l_int *)((char *)&u.bsd_dbreg + uap->addr) =
489 error = kern_ptrace(curp, PT_SETDBREGS, pid,
491 0, &uap->sysmsg_iresult);
499 kprintf("linux: ptrace(%u, ...) not implemented\n",
500 (unsigned int)uap->req);