2 * Copyright (c) 1994, Sean Eric Fagan
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 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Sean Eric Fagan.
16 * 4. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include "opt_compat.h"
37 #include <sys/param.h>
38 #include <sys/systm.h>
40 #include <sys/mutex.h>
41 #include <sys/syscallsubr.h>
42 #include <sys/sysent.h>
43 #include <sys/sysproto.h>
44 #include <sys/pioctl.h>
47 #include <sys/vnode.h>
48 #include <sys/ptrace.h>
49 #include <sys/rwlock.h>
51 #include <sys/malloc.h>
52 #include <sys/signalvar.h>
54 #include <machine/reg.h>
56 #include <security/audit/audit.h>
60 #include <vm/vm_extern.h>
61 #include <vm/vm_map.h>
62 #include <vm/vm_kern.h>
63 #include <vm/vm_object.h>
64 #include <vm/vm_page.h>
65 #include <vm/vm_param.h>
67 #ifdef COMPAT_FREEBSD32
68 #include <sys/procfs.h>
69 #include <compat/freebsd32/freebsd32_signal.h>
71 struct ptrace_io_desc32 {
78 struct ptrace_vm_entry32 {
91 struct ptrace_lwpinfo32 {
92 lwpid_t pl_lwpid; /* LWP described. */
93 int pl_event; /* Event that stopped the LWP. */
94 int pl_flags; /* LWP flags. */
95 sigset_t pl_sigmask; /* LWP signal mask */
96 sigset_t pl_siglist; /* LWP pending signal */
97 struct siginfo32 pl_siginfo; /* siginfo for signal */
98 char pl_tdname[MAXCOMLEN + 1]; /* LWP name. */
99 pid_t pl_child_pid; /* New child pid */
100 u_int pl_syscall_code;
101 u_int pl_syscall_narg;
107 * Functions implemented using PROC_ACTION():
109 * proc_read_regs(proc, regs)
110 * Get the current user-visible register set from the process
111 * and copy it into the regs structure (<machine/reg.h>).
112 * The process is stopped at the time read_regs is called.
114 * proc_write_regs(proc, regs)
115 * Update the current register set from the passed in regs
116 * structure. Take care to avoid clobbering special CPU
117 * registers or privileged bits in the PSL.
118 * Depending on the architecture this may have fix-up work to do,
119 * especially if the IAR or PCW are modified.
120 * The process is stopped at the time write_regs is called.
122 * proc_read_fpregs, proc_write_fpregs
123 * deal with the floating point register set, otherwise as above.
125 * proc_read_dbregs, proc_write_dbregs
126 * deal with the processor debug register set, otherwise as above.
129 * Arrange for the process to trap after executing a single instruction.
132 #define PROC_ACTION(action) do { \
135 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \
136 if ((td->td_proc->p_flag & P_INMEM) == 0) \
144 proc_read_regs(struct thread *td, struct reg *regs)
147 PROC_ACTION(fill_regs(td, regs));
151 proc_write_regs(struct thread *td, struct reg *regs)
154 PROC_ACTION(set_regs(td, regs));
158 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
161 PROC_ACTION(fill_dbregs(td, dbregs));
165 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
168 PROC_ACTION(set_dbregs(td, dbregs));
172 * Ptrace doesn't support fpregs at all, and there are no security holes
173 * or translations for fpregs, so we can just copy them.
176 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
179 PROC_ACTION(fill_fpregs(td, fpregs));
183 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
186 PROC_ACTION(set_fpregs(td, fpregs));
189 #ifdef COMPAT_FREEBSD32
190 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
192 proc_read_regs32(struct thread *td, struct reg32 *regs32)
195 PROC_ACTION(fill_regs32(td, regs32));
199 proc_write_regs32(struct thread *td, struct reg32 *regs32)
202 PROC_ACTION(set_regs32(td, regs32));
206 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
209 PROC_ACTION(fill_dbregs32(td, dbregs32));
213 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
216 PROC_ACTION(set_dbregs32(td, dbregs32));
220 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
223 PROC_ACTION(fill_fpregs32(td, fpregs32));
227 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
230 PROC_ACTION(set_fpregs32(td, fpregs32));
235 proc_sstep(struct thread *td)
238 PROC_ACTION(ptrace_single_step(td));
242 proc_rwmem(struct proc *p, struct uio *uio)
245 vm_offset_t pageno; /* page number */
247 int error, fault_flags, page_offset, writing;
250 * Assert that someone has locked this vmspace. (Should be
251 * curthread but we can't assert that.) This keeps the process
252 * from exiting out from under us until this operation completes.
255 PROC_LOCK_ASSERT(p, MA_NOTOWNED);
260 map = &p->p_vmspace->vm_map;
263 * If we are writing, then we request vm_fault() to create a private
264 * copy of each page. Since these copies will not be writeable by the
265 * process, we must explicity request that they be dirtied.
267 writing = uio->uio_rw == UIO_WRITE;
268 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
269 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
272 * Only map in one page at a time. We don't have to, but it
273 * makes things easier. This way is trivial - right?
280 uva = (vm_offset_t)uio->uio_offset;
283 * Get the page number of this segment.
285 pageno = trunc_page(uva);
286 page_offset = uva - pageno;
289 * How many bytes to copy
291 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
294 * Fault and hold the page on behalf of the process.
296 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m);
297 if (error != KERN_SUCCESS) {
298 if (error == KERN_RESOURCE_SHORTAGE)
306 * Now do the i/o move.
308 error = uiomove_fromphys(&m, page_offset, len, uio);
310 /* Make the I-cache coherent for breakpoints. */
311 if (writing && error == 0) {
312 vm_map_lock_read(map);
313 if (vm_map_check_protection(map, pageno, pageno +
314 PAGE_SIZE, VM_PROT_EXECUTE))
315 vm_sync_icache(map, uva, len);
316 vm_map_unlock_read(map);
326 } while (error == 0 && uio->uio_resid > 0);
332 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
333 size_t len, enum uio_rw rw)
340 MPASS(len < SSIZE_MAX);
343 iov.iov_base = (caddr_t)buf;
348 uio.uio_resid = slen;
349 uio.uio_segflg = UIO_SYSSPACE;
352 error = proc_rwmem(p, &uio);
353 if (uio.uio_resid == slen)
355 return (slen - uio.uio_resid);
359 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
363 return (proc_iop(td, p, va, buf, len, UIO_READ));
367 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
371 return (proc_iop(td, p, va, buf, len, UIO_WRITE));
375 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
379 vm_map_entry_t entry;
380 vm_object_t obj, tobj, lobj;
383 char *freepath, *fullpath;
390 vm = vmspace_acquire_ref(p);
392 vm_map_lock_read(map);
395 entry = map->header.next;
397 while (index < pve->pve_entry && entry != &map->header) {
401 if (index != pve->pve_entry) {
405 while (entry != &map->header &&
406 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
410 if (entry == &map->header) {
415 /* We got an entry. */
416 pve->pve_entry = index + 1;
417 pve->pve_timestamp = map->timestamp;
418 pve->pve_start = entry->start;
419 pve->pve_end = entry->end - 1;
420 pve->pve_offset = entry->offset;
421 pve->pve_prot = entry->protection;
423 /* Backing object's path needed? */
424 if (pve->pve_pathlen == 0)
427 pathlen = pve->pve_pathlen;
428 pve->pve_pathlen = 0;
430 obj = entry->object.vm_object;
432 VM_OBJECT_RLOCK(obj);
435 vm_map_unlock_read(map);
437 pve->pve_fsid = VNOVAL;
438 pve->pve_fileid = VNOVAL;
440 if (error == 0 && obj != NULL) {
442 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
444 VM_OBJECT_RLOCK(tobj);
446 VM_OBJECT_RUNLOCK(lobj);
448 pve->pve_offset += tobj->backing_object_offset;
450 vp = vm_object_vnode(lobj);
454 VM_OBJECT_RUNLOCK(lobj);
455 VM_OBJECT_RUNLOCK(obj);
460 vn_fullpath(td, vp, &fullpath, &freepath);
461 vn_lock(vp, LK_SHARED | LK_RETRY);
462 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
463 pve->pve_fileid = vattr.va_fileid;
464 pve->pve_fsid = vattr.va_fsid;
468 if (fullpath != NULL) {
469 pve->pve_pathlen = strlen(fullpath) + 1;
470 if (pve->pve_pathlen <= pathlen) {
471 error = copyout(fullpath, pve->pve_path,
474 error = ENAMETOOLONG;
476 if (freepath != NULL)
477 free(freepath, M_TEMP);
482 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
483 p->p_pid, pve->pve_entry, pve->pve_start);
488 #ifdef COMPAT_FREEBSD32
490 ptrace_vm_entry32(struct thread *td, struct proc *p,
491 struct ptrace_vm_entry32 *pve32)
493 struct ptrace_vm_entry pve;
496 pve.pve_entry = pve32->pve_entry;
497 pve.pve_pathlen = pve32->pve_pathlen;
498 pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
500 error = ptrace_vm_entry(td, p, &pve);
502 pve32->pve_entry = pve.pve_entry;
503 pve32->pve_timestamp = pve.pve_timestamp;
504 pve32->pve_start = pve.pve_start;
505 pve32->pve_end = pve.pve_end;
506 pve32->pve_offset = pve.pve_offset;
507 pve32->pve_prot = pve.pve_prot;
508 pve32->pve_fileid = pve.pve_fileid;
509 pve32->pve_fsid = pve.pve_fsid;
512 pve32->pve_pathlen = pve.pve_pathlen;
517 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
518 struct ptrace_lwpinfo32 *pl32)
521 pl32->pl_lwpid = pl->pl_lwpid;
522 pl32->pl_event = pl->pl_event;
523 pl32->pl_flags = pl->pl_flags;
524 pl32->pl_sigmask = pl->pl_sigmask;
525 pl32->pl_siglist = pl->pl_siglist;
526 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
527 strcpy(pl32->pl_tdname, pl->pl_tdname);
528 pl32->pl_child_pid = pl->pl_child_pid;
529 pl32->pl_syscall_code = pl->pl_syscall_code;
530 pl32->pl_syscall_narg = pl->pl_syscall_narg;
532 #endif /* COMPAT_FREEBSD32 */
535 * Process debugging system call.
537 #ifndef _SYS_SYSPROTO_H_
546 #ifdef COMPAT_FREEBSD32
548 * This CPP subterfuge is to try and reduce the number of ifdefs in
549 * the body of the code.
550 * COPYIN(uap->addr, &r.reg, sizeof r.reg);
552 * copyin(uap->addr, &r.reg, sizeof r.reg);
554 * copyin(uap->addr, &r.reg32, sizeof r.reg32);
555 * .. except this is done at runtime.
557 #define COPYIN(u, k, s) wrap32 ? \
558 copyin(u, k ## 32, s ## 32) : \
560 #define COPYOUT(k, u, s) wrap32 ? \
561 copyout(k ## 32, u, s ## 32) : \
564 #define COPYIN(u, k, s) copyin(u, k, s)
565 #define COPYOUT(k, u, s) copyout(k, u, s)
568 sys_ptrace(struct thread *td, struct ptrace_args *uap)
571 * XXX this obfuscation is to reduce stack usage, but the register
572 * structs may be too large to put on the stack anyway.
575 struct ptrace_io_desc piod;
576 struct ptrace_lwpinfo pl;
577 struct ptrace_vm_entry pve;
581 #ifdef COMPAT_FREEBSD32
582 struct dbreg32 dbreg32;
583 struct fpreg32 fpreg32;
585 struct ptrace_io_desc32 piod32;
586 struct ptrace_lwpinfo32 pl32;
587 struct ptrace_vm_entry32 pve32;
593 #ifdef COMPAT_FREEBSD32
596 if (SV_CURPROC_FLAG(SV_ILP32))
599 AUDIT_ARG_PID(uap->pid);
600 AUDIT_ARG_CMD(uap->req);
601 AUDIT_ARG_VALUE(uap->data);
604 case PT_GET_EVENT_MASK:
611 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
614 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
617 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
619 case PT_SET_EVENT_MASK:
620 if (uap->data != sizeof(r.ptevents))
623 error = copyin(uap->addr, &r.ptevents, uap->data);
626 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
629 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
638 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
644 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
647 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
650 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
653 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
656 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
658 case PT_GET_EVENT_MASK:
659 /* NB: The size in uap->data is validated in kern_ptrace(). */
660 error = copyout(&r.ptevents, uap->addr, uap->data);
663 /* NB: The size in uap->data is validated in kern_ptrace(). */
664 error = copyout(&r.pl, uap->addr, uap->data);
673 #ifdef COMPAT_FREEBSD32
675 * PROC_READ(regs, td2, addr);
677 * proc_read_regs(td2, addr);
679 * proc_read_regs32(td2, addr);
680 * .. except this is done at runtime. There is an additional
681 * complication in that PROC_WRITE disallows 32 bit consumers
682 * from writing to 64 bit address space targets.
684 #define PROC_READ(w, t, a) wrap32 ? \
685 proc_read_ ## w ## 32(t, a) : \
686 proc_read_ ## w (t, a)
687 #define PROC_WRITE(w, t, a) wrap32 ? \
688 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
689 proc_write_ ## w (t, a)
691 #define PROC_READ(w, t, a) proc_read_ ## w (t, a)
692 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a)
696 proc_set_traced(struct proc *p)
699 PROC_LOCK_ASSERT(p, MA_OWNED);
700 p->p_flag |= P_TRACED;
701 p->p_flag2 |= P2_PTRACE_FSTP;
702 p->p_ptevents = PTRACE_DEFAULT;
703 p->p_oppid = p->p_pptr->p_pid;
707 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
711 struct proc *curp, *p, *pp;
712 struct thread *td2 = NULL, *td3;
713 struct ptrace_io_desc *piod = NULL;
714 struct ptrace_lwpinfo *pl;
716 int proctree_locked = 0;
717 lwpid_t tid = 0, *buf;
718 #ifdef COMPAT_FREEBSD32
719 int wrap32 = 0, safe = 0;
720 struct ptrace_io_desc32 *piod32 = NULL;
721 struct ptrace_lwpinfo32 *pl32 = NULL;
722 struct ptrace_lwpinfo plr;
727 /* Lock proctree before locking the process. */
738 case PT_GET_EVENT_MASK:
739 case PT_SET_EVENT_MASK:
741 sx_xlock(&proctree_lock);
748 if (req == PT_TRACE_ME) {
752 if (pid <= PID_MAX) {
753 if ((p = pfind(pid)) == NULL) {
755 sx_xunlock(&proctree_lock);
759 td2 = tdfind(pid, -1);
762 sx_xunlock(&proctree_lock);
770 AUDIT_ARG_PROCESS(p);
772 if ((p->p_flag & P_WEXIT) != 0) {
776 if ((error = p_cansee(td, p)) != 0)
779 if ((error = p_candebug(td, p)) != 0)
783 * System processes can't be debugged.
785 if ((p->p_flag & P_SYSTEM) != 0) {
791 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
792 KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
795 td2 = FIRST_THREAD_IN_PROC(p);
800 #ifdef COMPAT_FREEBSD32
802 * Test if we're a 32 bit client and what the target is.
803 * Set the wrap controls accordingly.
805 if (SV_CURPROC_FLAG(SV_ILP32)) {
806 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
817 * Always legal, when there is a parent process which
818 * could trace us. Otherwise, reject.
820 if ((p->p_flag & P_TRACED) != 0) {
824 if (p->p_pptr == initproc) {
832 if (p == td->td_proc) {
838 if (p->p_flag & P_TRACED) {
843 /* Can't trace an ancestor if you're being traced. */
844 if (curp->p_flag & P_TRACED) {
845 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
858 /* Allow thread to clear single step for itself */
859 if (td->td_tid == tid)
864 /* not being traced... */
865 if ((p->p_flag & P_TRACED) == 0) {
870 /* not being traced by YOU */
871 if (p->p_pptr != td->td_proc) {
876 /* not currently stopped */
877 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 ||
878 p->p_suspcount != p->p_numthreads ||
879 (p->p_flag & P_WAITED) == 0) {
884 if ((p->p_flag & P_STOPPED_TRACE) == 0) {
885 static int count = 0;
887 printf("P_STOPPED_TRACE not set.\n");
894 /* Keep this process around until we finish this request. */
899 * Single step fixup ala procfs
905 * Actually do the requests
908 td->td_retval[0] = 0;
912 /* set my trace flag and "owner" so it can read/write me */
914 if (p->p_flag & P_PPWAIT)
915 p->p_flag |= P_PPTRACE;
916 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
920 /* security check done above */
922 * It would be nice if the tracing relationship was separate
923 * from the parent relationship but that would require
924 * another set of links in the proc struct or for "wait"
925 * to scan the entire proc table. To make life easier,
926 * we just re-parent the process we're trying to trace.
927 * The old parent is remembered so we can put things back
931 if (p->p_pptr != td->td_proc) {
932 proc_reparent(p, td->td_proc);
935 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
937 goto sendsig; /* in PT_CONTINUE below */
940 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
942 error = ptrace_clear_single_step(td2);
946 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
948 error = ptrace_single_step(td2);
952 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
954 td2->td_dbgflags |= TDB_SUSPEND;
956 td2->td_flags |= TDF_NEEDSUSPCHK;
961 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
963 td2->td_dbgflags &= ~TDB_SUSPEND;
967 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
968 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled",
969 data ? "enabled" : "disabled");
971 p->p_ptevents |= PTRACE_FORK;
973 p->p_ptevents &= ~PTRACE_FORK;
977 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid,
978 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled",
979 data ? "enabled" : "disabled");
981 p->p_ptevents |= PTRACE_LWP;
983 p->p_ptevents &= ~PTRACE_LWP;
986 case PT_GET_EVENT_MASK:
987 if (data != sizeof(p->p_ptevents)) {
991 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid,
993 *(int *)addr = p->p_ptevents;
996 case PT_SET_EVENT_MASK:
997 if (data != sizeof(p->p_ptevents)) {
1002 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX |
1003 PTRACE_FORK | PTRACE_LWP)) != 0) {
1007 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x",
1008 p->p_pid, p->p_ptevents, tmp);
1009 p->p_ptevents = tmp;
1018 /* Zero means do not send any signal */
1019 if (data < 0 || data > _SIG_MAXSIG) {
1026 CTR2(KTR_PTRACE, "PT_STEP: tid %d (pid %d)",
1027 td2->td_tid, p->p_pid);
1028 error = ptrace_single_step(td2);
1036 if (addr != (void *)1) {
1037 error = ptrace_set_pc(td2,
1038 (u_long)(uintfptr_t)addr);
1044 p->p_ptevents |= PTRACE_SCE;
1046 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d",
1047 p->p_pid, p->p_ptevents,
1048 (u_long)(uintfptr_t)addr, data);
1051 p->p_ptevents |= PTRACE_SCX;
1053 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d",
1054 p->p_pid, p->p_ptevents,
1055 (u_long)(uintfptr_t)addr, data);
1058 p->p_ptevents |= PTRACE_SYSCALL;
1060 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d",
1061 p->p_pid, p->p_ptevents,
1062 (u_long)(uintfptr_t)addr, data);
1066 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
1067 p->p_pid, (u_long)(uintfptr_t)addr, data);
1073 * Reset the process parent.
1075 * NB: This clears P_TRACED before reparenting
1076 * a detached process back to its original
1077 * parent. Otherwise the debugee will be set
1078 * as an orphan of the debugger.
1080 p->p_flag &= ~(P_TRACED | P_WAITED);
1081 if (p->p_oppid != p->p_pptr->p_pid) {
1082 PROC_LOCK(p->p_pptr);
1083 sigqueue_take(p->p_ksi);
1084 PROC_UNLOCK(p->p_pptr);
1086 pp = proc_realparent(p);
1087 proc_reparent(p, pp);
1089 p->p_sigparent = SIGCHLD;
1091 "PT_DETACH: pid %d reparented to pid %d, sig %d",
1092 p->p_pid, pp->p_pid, data);
1094 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
1098 FOREACH_THREAD_IN_PROC(p, td3) {
1099 if ((td3->td_dbgflags & TDB_FSTP) != 0) {
1100 sigqueue_delete(&td3->td_sigqueue,
1103 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP);
1105 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) {
1106 sigqueue_delete(&p->p_sigqueue, SIGSTOP);
1107 p->p_flag2 &= ~P2_PTRACE_FSTP;
1110 /* should we send SIGCHLD? */
1111 /* childproc_continued(p); */
1116 if (proctree_locked) {
1117 sx_xunlock(&proctree_lock);
1118 proctree_locked = 0;
1121 p->p_xthread = NULL;
1122 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) {
1123 /* deliver or queue signal */
1124 td2->td_dbgflags &= ~TDB_XSIG;
1125 td2->td_xsig = data;
1127 if (req == PT_DETACH) {
1128 FOREACH_THREAD_IN_PROC(p, td3)
1129 td3->td_dbgflags &= ~TDB_SUSPEND;
1132 * unsuspend all threads, to not let a thread run,
1133 * you should use PT_SUSPEND to suspend it before
1134 * continuing process.
1137 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED);
1138 thread_unsuspend(p);
1140 if (req == PT_ATTACH)
1141 kern_psignal(p, data);
1144 kern_psignal(p, data);
1150 td2->td_dbgflags |= TDB_USERWR;
1153 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data,
1154 sizeof(int)) != sizeof(int))
1157 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
1158 p->p_pid, addr, data);
1166 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp,
1167 sizeof(int)) != sizeof(int))
1170 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
1171 p->p_pid, addr, tmp);
1172 td->td_retval[0] = tmp;
1177 #ifdef COMPAT_FREEBSD32
1180 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
1181 iov.iov_len = piod32->piod_len;
1182 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
1183 uio.uio_resid = piod32->piod_len;
1188 iov.iov_base = piod->piod_addr;
1189 iov.iov_len = piod->piod_len;
1190 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
1191 uio.uio_resid = piod->piod_len;
1195 uio.uio_segflg = UIO_USERSPACE;
1197 #ifdef COMPAT_FREEBSD32
1198 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
1200 tmp = piod->piod_op;
1205 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
1206 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1207 uio.uio_rw = UIO_READ;
1211 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
1212 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1213 td2->td_dbgflags |= TDB_USERWR;
1214 uio.uio_rw = UIO_WRITE;
1221 error = proc_rwmem(p, &uio);
1222 #ifdef COMPAT_FREEBSD32
1224 piod32->piod_len -= uio.uio_resid;
1227 piod->piod_len -= uio.uio_resid;
1232 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
1234 goto sendsig; /* in PT_CONTINUE above */
1237 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
1239 td2->td_dbgflags |= TDB_USERWR;
1240 error = PROC_WRITE(regs, td2, addr);
1244 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
1246 error = PROC_READ(regs, td2, addr);
1250 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
1252 td2->td_dbgflags |= TDB_USERWR;
1253 error = PROC_WRITE(fpregs, td2, addr);
1257 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
1259 error = PROC_READ(fpregs, td2, addr);
1263 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
1265 td2->td_dbgflags |= TDB_USERWR;
1266 error = PROC_WRITE(dbregs, td2, addr);
1270 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
1272 error = PROC_READ(dbregs, td2, addr);
1277 #ifdef COMPAT_FREEBSD32
1278 (!wrap32 && data > sizeof(*pl)) ||
1279 (wrap32 && data > sizeof(*pl32))) {
1281 data > sizeof(*pl)) {
1286 #ifdef COMPAT_FREEBSD32
1293 pl->pl_lwpid = td2->td_tid;
1294 pl->pl_event = PL_EVENT_NONE;
1296 if (td2->td_dbgflags & TDB_XSIG) {
1297 pl->pl_event = PL_EVENT_SIGNAL;
1298 if (td2->td_dbgksi.ksi_signo != 0 &&
1299 #ifdef COMPAT_FREEBSD32
1300 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
1301 pl_siginfo) + sizeof(pl->pl_siginfo)) ||
1302 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
1303 pl_siginfo) + sizeof(struct siginfo32)))
1305 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
1306 + sizeof(pl->pl_siginfo)
1309 pl->pl_flags |= PL_FLAG_SI;
1310 pl->pl_siginfo = td2->td_dbgksi.ksi_info;
1313 if ((pl->pl_flags & PL_FLAG_SI) == 0)
1314 bzero(&pl->pl_siginfo, sizeof(pl->pl_siginfo));
1315 if (td2->td_dbgflags & TDB_SCE)
1316 pl->pl_flags |= PL_FLAG_SCE;
1317 else if (td2->td_dbgflags & TDB_SCX)
1318 pl->pl_flags |= PL_FLAG_SCX;
1319 if (td2->td_dbgflags & TDB_EXEC)
1320 pl->pl_flags |= PL_FLAG_EXEC;
1321 if (td2->td_dbgflags & TDB_FORK) {
1322 pl->pl_flags |= PL_FLAG_FORKED;
1323 pl->pl_child_pid = td2->td_dbg_forked;
1325 if (td2->td_dbgflags & TDB_CHILD)
1326 pl->pl_flags |= PL_FLAG_CHILD;
1327 if (td2->td_dbgflags & TDB_BORN)
1328 pl->pl_flags |= PL_FLAG_BORN;
1329 if (td2->td_dbgflags & TDB_EXIT)
1330 pl->pl_flags |= PL_FLAG_EXITED;
1331 pl->pl_sigmask = td2->td_sigmask;
1332 pl->pl_siglist = td2->td_siglist;
1333 strcpy(pl->pl_tdname, td2->td_name);
1334 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
1335 pl->pl_syscall_code = td2->td_dbg_sc_code;
1336 pl->pl_syscall_narg = td2->td_dbg_sc_narg;
1338 pl->pl_syscall_code = 0;
1339 pl->pl_syscall_narg = 0;
1341 #ifdef COMPAT_FREEBSD32
1343 ptrace_lwpinfo_to32(pl, pl32);
1346 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
1347 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
1348 pl->pl_child_pid, pl->pl_syscall_code);
1352 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
1354 td->td_retval[0] = p->p_numthreads;
1358 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
1359 p->p_pid, data, p->p_numthreads);
1364 num = imin(p->p_numthreads, data);
1366 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
1369 FOREACH_THREAD_IN_PROC(p, td2) {
1372 buf[tmp++] = td2->td_tid;
1375 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
1378 td->td_retval[0] = tmp;
1382 case PT_VM_TIMESTAMP:
1383 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
1384 p->p_pid, p->p_vmspace->vm_map.timestamp);
1385 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
1390 #ifdef COMPAT_FREEBSD32
1392 error = ptrace_vm_entry32(td, p, addr);
1395 error = ptrace_vm_entry(td, p, addr);
1400 #ifdef __HAVE_PTRACE_MACHDEP
1401 if (req >= PT_FIRSTMACH) {
1403 error = cpu_ptrace(td2, req, addr, data);
1407 /* Unknown request. */
1413 /* Drop our hold on this process now that the request has completed. */
1417 if (proctree_locked)
1418 sx_xunlock(&proctree_lock);
1425 * Stop a process because of a debugging event;
1426 * stay stopped until p->p_step is cleared
1427 * (cleared by PIOCCONT in procfs).
1430 stopevent(struct proc *p, unsigned int event, unsigned int val)
1433 PROC_LOCK_ASSERT(p, MA_OWNED);
1435 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
1438 if (event != S_EXIT)
1440 p->p_xthread = NULL;
1441 p->p_stype = event; /* Which event caused the stop? */
1442 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */
1443 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
1444 } while (p->p_step);