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 {
93 * Functions implemented using PROC_ACTION():
95 * proc_read_regs(proc, regs)
96 * Get the current user-visible register set from the process
97 * and copy it into the regs structure (<machine/reg.h>).
98 * The process is stopped at the time read_regs is called.
100 * proc_write_regs(proc, regs)
101 * Update the current register set from the passed in regs
102 * structure. Take care to avoid clobbering special CPU
103 * registers or privileged bits in the PSL.
104 * Depending on the architecture this may have fix-up work to do,
105 * especially if the IAR or PCW are modified.
106 * The process is stopped at the time write_regs is called.
108 * proc_read_fpregs, proc_write_fpregs
109 * deal with the floating point register set, otherwise as above.
111 * proc_read_dbregs, proc_write_dbregs
112 * deal with the processor debug register set, otherwise as above.
115 * Arrange for the process to trap after executing a single instruction.
118 #define PROC_ACTION(action) do { \
121 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \
122 if ((td->td_proc->p_flag & P_INMEM) == 0) \
130 proc_read_regs(struct thread *td, struct reg *regs)
133 PROC_ACTION(fill_regs(td, regs));
137 proc_write_regs(struct thread *td, struct reg *regs)
140 PROC_ACTION(set_regs(td, regs));
144 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
147 PROC_ACTION(fill_dbregs(td, dbregs));
151 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
154 PROC_ACTION(set_dbregs(td, dbregs));
158 * Ptrace doesn't support fpregs at all, and there are no security holes
159 * or translations for fpregs, so we can just copy them.
162 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
165 PROC_ACTION(fill_fpregs(td, fpregs));
169 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
172 PROC_ACTION(set_fpregs(td, fpregs));
175 #ifdef COMPAT_FREEBSD32
176 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
178 proc_read_regs32(struct thread *td, struct reg32 *regs32)
181 PROC_ACTION(fill_regs32(td, regs32));
185 proc_write_regs32(struct thread *td, struct reg32 *regs32)
188 PROC_ACTION(set_regs32(td, regs32));
192 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
195 PROC_ACTION(fill_dbregs32(td, dbregs32));
199 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
202 PROC_ACTION(set_dbregs32(td, dbregs32));
206 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
209 PROC_ACTION(fill_fpregs32(td, fpregs32));
213 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
216 PROC_ACTION(set_fpregs32(td, fpregs32));
221 proc_sstep(struct thread *td)
224 PROC_ACTION(ptrace_single_step(td));
228 proc_rwmem(struct proc *p, struct uio *uio)
231 vm_offset_t pageno; /* page number */
233 int error, fault_flags, page_offset, writing;
236 * Assert that someone has locked this vmspace. (Should be
237 * curthread but we can't assert that.) This keeps the process
238 * from exiting out from under us until this operation completes.
241 PROC_LOCK_ASSERT(p, MA_NOTOWNED);
246 map = &p->p_vmspace->vm_map;
249 * If we are writing, then we request vm_fault() to create a private
250 * copy of each page. Since these copies will not be writeable by the
251 * process, we must explicity request that they be dirtied.
253 writing = uio->uio_rw == UIO_WRITE;
254 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
255 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
258 * Only map in one page at a time. We don't have to, but it
259 * makes things easier. This way is trivial - right?
266 uva = (vm_offset_t)uio->uio_offset;
269 * Get the page number of this segment.
271 pageno = trunc_page(uva);
272 page_offset = uva - pageno;
275 * How many bytes to copy
277 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
280 * Fault and hold the page on behalf of the process.
282 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m);
283 if (error != KERN_SUCCESS) {
284 if (error == KERN_RESOURCE_SHORTAGE)
292 * Now do the i/o move.
294 error = uiomove_fromphys(&m, page_offset, len, uio);
296 /* Make the I-cache coherent for breakpoints. */
297 if (writing && error == 0) {
298 vm_map_lock_read(map);
299 if (vm_map_check_protection(map, pageno, pageno +
300 PAGE_SIZE, VM_PROT_EXECUTE))
301 vm_sync_icache(map, uva, len);
302 vm_map_unlock_read(map);
312 } while (error == 0 && uio->uio_resid > 0);
318 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
319 size_t len, enum uio_rw rw)
326 MPASS(len < SSIZE_MAX);
329 iov.iov_base = (caddr_t)buf;
334 uio.uio_resid = slen;
335 uio.uio_segflg = UIO_SYSSPACE;
338 error = proc_rwmem(p, &uio);
339 if (uio.uio_resid == slen)
341 return (slen - uio.uio_resid);
345 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
349 return (proc_iop(td, p, va, buf, len, UIO_READ));
353 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
357 return (proc_iop(td, p, va, buf, len, UIO_WRITE));
361 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
365 vm_map_entry_t entry;
366 vm_object_t obj, tobj, lobj;
369 char *freepath, *fullpath;
376 vm = vmspace_acquire_ref(p);
378 vm_map_lock_read(map);
381 entry = map->header.next;
383 while (index < pve->pve_entry && entry != &map->header) {
387 if (index != pve->pve_entry) {
391 while (entry != &map->header &&
392 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
396 if (entry == &map->header) {
401 /* We got an entry. */
402 pve->pve_entry = index + 1;
403 pve->pve_timestamp = map->timestamp;
404 pve->pve_start = entry->start;
405 pve->pve_end = entry->end - 1;
406 pve->pve_offset = entry->offset;
407 pve->pve_prot = entry->protection;
409 /* Backing object's path needed? */
410 if (pve->pve_pathlen == 0)
413 pathlen = pve->pve_pathlen;
414 pve->pve_pathlen = 0;
416 obj = entry->object.vm_object;
418 VM_OBJECT_RLOCK(obj);
421 vm_map_unlock_read(map);
423 pve->pve_fsid = VNOVAL;
424 pve->pve_fileid = VNOVAL;
426 if (error == 0 && obj != NULL) {
428 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
430 VM_OBJECT_RLOCK(tobj);
432 VM_OBJECT_RUNLOCK(lobj);
434 pve->pve_offset += tobj->backing_object_offset;
436 vp = vm_object_vnode(lobj);
440 VM_OBJECT_RUNLOCK(lobj);
441 VM_OBJECT_RUNLOCK(obj);
446 vn_fullpath(td, vp, &fullpath, &freepath);
447 vn_lock(vp, LK_SHARED | LK_RETRY);
448 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
449 pve->pve_fileid = vattr.va_fileid;
450 pve->pve_fsid = vattr.va_fsid;
454 if (fullpath != NULL) {
455 pve->pve_pathlen = strlen(fullpath) + 1;
456 if (pve->pve_pathlen <= pathlen) {
457 error = copyout(fullpath, pve->pve_path,
460 error = ENAMETOOLONG;
462 if (freepath != NULL)
463 free(freepath, M_TEMP);
468 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
469 p->p_pid, pve->pve_entry, pve->pve_start);
474 #ifdef COMPAT_FREEBSD32
476 ptrace_vm_entry32(struct thread *td, struct proc *p,
477 struct ptrace_vm_entry32 *pve32)
479 struct ptrace_vm_entry pve;
482 pve.pve_entry = pve32->pve_entry;
483 pve.pve_pathlen = pve32->pve_pathlen;
484 pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
486 error = ptrace_vm_entry(td, p, &pve);
488 pve32->pve_entry = pve.pve_entry;
489 pve32->pve_timestamp = pve.pve_timestamp;
490 pve32->pve_start = pve.pve_start;
491 pve32->pve_end = pve.pve_end;
492 pve32->pve_offset = pve.pve_offset;
493 pve32->pve_prot = pve.pve_prot;
494 pve32->pve_fileid = pve.pve_fileid;
495 pve32->pve_fsid = pve.pve_fsid;
498 pve32->pve_pathlen = pve.pve_pathlen;
503 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
504 struct ptrace_lwpinfo32 *pl32)
507 bzero(pl32, sizeof(*pl32));
508 pl32->pl_lwpid = pl->pl_lwpid;
509 pl32->pl_event = pl->pl_event;
510 pl32->pl_flags = pl->pl_flags;
511 pl32->pl_sigmask = pl->pl_sigmask;
512 pl32->pl_siglist = pl->pl_siglist;
513 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
514 strcpy(pl32->pl_tdname, pl->pl_tdname);
515 pl32->pl_child_pid = pl->pl_child_pid;
516 pl32->pl_syscall_code = pl->pl_syscall_code;
517 pl32->pl_syscall_narg = pl->pl_syscall_narg;
519 #endif /* COMPAT_FREEBSD32 */
522 * Process debugging system call.
524 #ifndef _SYS_SYSPROTO_H_
533 #ifdef COMPAT_FREEBSD32
535 * This CPP subterfuge is to try and reduce the number of ifdefs in
536 * the body of the code.
537 * COPYIN(uap->addr, &r.reg, sizeof r.reg);
539 * copyin(uap->addr, &r.reg, sizeof r.reg);
541 * copyin(uap->addr, &r.reg32, sizeof r.reg32);
542 * .. except this is done at runtime.
544 #define BZERO(a, s) wrap32 ? \
545 bzero(a ## 32, s ## 32) : \
547 #define COPYIN(u, k, s) wrap32 ? \
548 copyin(u, k ## 32, s ## 32) : \
550 #define COPYOUT(k, u, s) wrap32 ? \
551 copyout(k ## 32, u, s ## 32) : \
554 #define BZERO(a, s) bzero(a, s)
555 #define COPYIN(u, k, s) copyin(u, k, s)
556 #define COPYOUT(k, u, s) copyout(k, u, s)
559 sys_ptrace(struct thread *td, struct ptrace_args *uap)
562 * XXX this obfuscation is to reduce stack usage, but the register
563 * structs may be too large to put on the stack anyway.
566 struct ptrace_io_desc piod;
567 struct ptrace_lwpinfo pl;
568 struct ptrace_vm_entry pve;
572 #ifdef COMPAT_FREEBSD32
573 struct dbreg32 dbreg32;
574 struct fpreg32 fpreg32;
576 struct ptrace_io_desc32 piod32;
577 struct ptrace_lwpinfo32 pl32;
578 struct ptrace_vm_entry32 pve32;
580 char args[sizeof(td->td_sa.args)];
585 #ifdef COMPAT_FREEBSD32
588 if (SV_CURPROC_FLAG(SV_ILP32))
591 AUDIT_ARG_PID(uap->pid);
592 AUDIT_ARG_CMD(uap->req);
593 AUDIT_ARG_VALUE(uap->data);
596 case PT_GET_EVENT_MASK:
601 BZERO(&r.reg, sizeof r.reg);
604 BZERO(&r.fpreg, sizeof r.fpreg);
607 BZERO(&r.dbreg, sizeof r.dbreg);
610 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
613 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
616 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
618 case PT_SET_EVENT_MASK:
619 if (uap->data != sizeof(r.ptevents))
622 error = copyin(uap->addr, &r.ptevents, uap->data);
625 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
628 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
637 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
643 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
646 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
649 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
652 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
655 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
657 case PT_GET_EVENT_MASK:
658 /* NB: The size in uap->data is validated in kern_ptrace(). */
659 error = copyout(&r.ptevents, uap->addr, uap->data);
662 /* NB: The size in uap->data is validated in kern_ptrace(). */
663 error = copyout(&r.pl, uap->addr, uap->data);
666 error = copyout(r.args, uap->addr, MIN(uap->data,
677 #ifdef COMPAT_FREEBSD32
679 * PROC_READ(regs, td2, addr);
681 * proc_read_regs(td2, addr);
683 * proc_read_regs32(td2, addr);
684 * .. except this is done at runtime. There is an additional
685 * complication in that PROC_WRITE disallows 32 bit consumers
686 * from writing to 64 bit address space targets.
688 #define PROC_READ(w, t, a) wrap32 ? \
689 proc_read_ ## w ## 32(t, a) : \
690 proc_read_ ## w (t, a)
691 #define PROC_WRITE(w, t, a) wrap32 ? \
692 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
693 proc_write_ ## w (t, a)
695 #define PROC_READ(w, t, a) proc_read_ ## w (t, a)
696 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a)
700 proc_set_traced(struct proc *p, bool stop)
703 sx_assert(&proctree_lock, SX_XLOCKED);
704 PROC_LOCK_ASSERT(p, MA_OWNED);
705 p->p_flag |= P_TRACED;
707 p->p_flag2 |= P2_PTRACE_FSTP;
708 p->p_ptevents = PTRACE_DEFAULT;
709 p->p_oppid = p->p_pptr->p_pid;
713 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
717 struct proc *curp, *p, *pp;
718 struct thread *td2 = NULL, *td3;
719 struct ptrace_io_desc *piod = NULL;
720 struct ptrace_lwpinfo *pl;
722 int proctree_locked = 0;
723 lwpid_t tid = 0, *buf;
724 #ifdef COMPAT_FREEBSD32
725 int wrap32 = 0, safe = 0;
726 struct ptrace_io_desc32 *piod32 = NULL;
727 struct ptrace_lwpinfo32 *pl32 = NULL;
728 struct ptrace_lwpinfo plr;
733 /* Lock proctree before locking the process. */
744 case PT_GET_EVENT_MASK:
745 case PT_SET_EVENT_MASK:
748 sx_xlock(&proctree_lock);
755 if (req == PT_TRACE_ME) {
759 if (pid <= PID_MAX) {
760 if ((p = pfind(pid)) == NULL) {
762 sx_xunlock(&proctree_lock);
766 td2 = tdfind(pid, -1);
769 sx_xunlock(&proctree_lock);
777 AUDIT_ARG_PROCESS(p);
779 if ((p->p_flag & P_WEXIT) != 0) {
783 if ((error = p_cansee(td, p)) != 0)
786 if ((error = p_candebug(td, p)) != 0)
790 * System processes can't be debugged.
792 if ((p->p_flag & P_SYSTEM) != 0) {
798 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
799 KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
802 td2 = FIRST_THREAD_IN_PROC(p);
807 #ifdef COMPAT_FREEBSD32
809 * Test if we're a 32 bit client and what the target is.
810 * Set the wrap controls accordingly.
812 if (SV_CURPROC_FLAG(SV_ILP32)) {
813 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
824 * Always legal, when there is a parent process which
825 * could trace us. Otherwise, reject.
827 if ((p->p_flag & P_TRACED) != 0) {
831 if (p->p_pptr == initproc) {
839 if (p == td->td_proc) {
845 if (p->p_flag & P_TRACED) {
850 /* Can't trace an ancestor if you're being traced. */
851 if (curp->p_flag & P_TRACED) {
852 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
865 /* Allow thread to clear single step for itself */
866 if (td->td_tid == tid)
871 /* not being traced... */
872 if ((p->p_flag & P_TRACED) == 0) {
877 /* not being traced by YOU */
878 if (p->p_pptr != td->td_proc) {
883 /* not currently stopped */
884 if ((p->p_flag & P_STOPPED_TRACE) == 0 ||
885 p->p_suspcount != p->p_numthreads ||
886 (p->p_flag & P_WAITED) == 0) {
895 /* Keep this process around until we finish this request. */
900 * Single step fixup ala procfs
906 * Actually do the requests
909 td->td_retval[0] = 0;
913 /* set my trace flag and "owner" so it can read/write me */
914 proc_set_traced(p, false);
915 if (p->p_flag & P_PPWAIT)
916 p->p_flag |= P_PPTRACE;
917 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
921 /* security check done above */
923 * It would be nice if the tracing relationship was separate
924 * from the parent relationship but that would require
925 * another set of links in the proc struct or for "wait"
926 * to scan the entire proc table. To make life easier,
927 * we just re-parent the process we're trying to trace.
928 * The old parent is remembered so we can put things back
931 proc_set_traced(p, true);
932 if (p->p_pptr != td->td_proc) {
933 proc_reparent(p, td->td_proc);
935 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
938 sx_xunlock(&proctree_lock);
940 MPASS(p->p_xthread == NULL);
941 MPASS((p->p_flag & P_STOPPED_TRACE) == 0);
944 * If already stopped due to a stop signal, clear the
945 * existing stop before triggering a traced SIGSTOP.
947 if ((p->p_flag & P_STOPPED_SIG) != 0) {
949 p->p_flag &= ~(P_STOPPED_SIG | P_WAITED);
954 kern_psignal(p, SIGSTOP);
958 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
960 error = ptrace_clear_single_step(td2);
964 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
966 error = ptrace_single_step(td2);
970 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
972 td2->td_dbgflags |= TDB_SUSPEND;
974 td2->td_flags |= TDF_NEEDSUSPCHK;
979 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
981 td2->td_dbgflags &= ~TDB_SUSPEND;
985 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
986 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled",
987 data ? "enabled" : "disabled");
989 p->p_ptevents |= PTRACE_FORK;
991 p->p_ptevents &= ~PTRACE_FORK;
995 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid,
996 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled",
997 data ? "enabled" : "disabled");
999 p->p_ptevents |= PTRACE_LWP;
1001 p->p_ptevents &= ~PTRACE_LWP;
1004 case PT_GET_EVENT_MASK:
1005 if (data != sizeof(p->p_ptevents)) {
1009 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid,
1011 *(int *)addr = p->p_ptevents;
1014 case PT_SET_EVENT_MASK:
1015 if (data != sizeof(p->p_ptevents)) {
1020 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX |
1021 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) {
1025 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x",
1026 p->p_pid, p->p_ptevents, tmp);
1027 p->p_ptevents = tmp;
1030 case PT_GET_SC_ARGS:
1031 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid);
1032 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0
1033 #ifdef COMPAT_FREEBSD32
1034 || (wrap32 && !safe)
1040 bzero(addr, sizeof(td2->td_sa.args));
1041 #ifdef COMPAT_FREEBSD32
1043 for (num = 0; num < nitems(td2->td_sa.args); num++)
1044 ((uint32_t *)addr)[num] = (uint32_t)
1045 td2->td_sa.args[num];
1048 bcopy(td2->td_sa.args, addr, td2->td_sa.narg *
1049 sizeof(register_t));
1058 /* Zero means do not send any signal */
1059 if (data < 0 || data > _SIG_MAXSIG) {
1066 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d",
1067 td2->td_tid, p->p_pid, data);
1068 error = ptrace_single_step(td2);
1076 if (addr != (void *)1) {
1077 error = ptrace_set_pc(td2,
1078 (u_long)(uintfptr_t)addr);
1084 p->p_ptevents |= PTRACE_SCE;
1086 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d",
1087 p->p_pid, p->p_ptevents,
1088 (u_long)(uintfptr_t)addr, data);
1091 p->p_ptevents |= PTRACE_SCX;
1093 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d",
1094 p->p_pid, p->p_ptevents,
1095 (u_long)(uintfptr_t)addr, data);
1098 p->p_ptevents |= PTRACE_SYSCALL;
1100 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d",
1101 p->p_pid, p->p_ptevents,
1102 (u_long)(uintfptr_t)addr, data);
1106 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
1107 p->p_pid, (u_long)(uintfptr_t)addr, data);
1113 * Reset the process parent.
1115 * NB: This clears P_TRACED before reparenting
1116 * a detached process back to its original
1117 * parent. Otherwise the debugee will be set
1118 * as an orphan of the debugger.
1120 p->p_flag &= ~(P_TRACED | P_WAITED);
1121 if (p->p_oppid != p->p_pptr->p_pid) {
1122 PROC_LOCK(p->p_pptr);
1123 sigqueue_take(p->p_ksi);
1124 PROC_UNLOCK(p->p_pptr);
1126 pp = proc_realparent(p);
1127 proc_reparent(p, pp);
1129 p->p_sigparent = SIGCHLD;
1131 "PT_DETACH: pid %d reparented to pid %d, sig %d",
1132 p->p_pid, pp->p_pid, data);
1134 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
1138 FOREACH_THREAD_IN_PROC(p, td3) {
1139 if ((td3->td_dbgflags & TDB_FSTP) != 0) {
1140 sigqueue_delete(&td3->td_sigqueue,
1143 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP |
1147 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) {
1148 sigqueue_delete(&p->p_sigqueue, SIGSTOP);
1149 p->p_flag2 &= ~P2_PTRACE_FSTP;
1152 /* should we send SIGCHLD? */
1153 /* childproc_continued(p); */
1157 sx_xunlock(&proctree_lock);
1158 proctree_locked = 0;
1161 MPASS(proctree_locked == 0);
1164 * Clear the pending event for the thread that just
1165 * reported its event (p_xthread). This may not be
1166 * the thread passed to PT_CONTINUE, PT_STEP, etc. if
1167 * the debugger is resuming a different thread.
1169 * Deliver any pending signal via the reporting thread.
1171 MPASS(p->p_xthread != NULL);
1172 p->p_xthread->td_dbgflags &= ~TDB_XSIG;
1173 p->p_xthread->td_xsig = data;
1174 p->p_xthread = NULL;
1178 * P_WKILLED is insurance that a PT_KILL/SIGKILL
1179 * always works immediately, even if another thread is
1180 * unsuspended first and attempts to handle a
1181 * different signal or if the POSIX.1b style signal
1182 * queue cannot accommodate any new signals.
1184 if (data == SIGKILL)
1188 * Unsuspend all threads. To leave a thread
1189 * suspended, use PT_SUSPEND to suspend it before
1190 * continuing the process.
1193 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED);
1194 thread_unsuspend(p);
1200 td2->td_dbgflags |= TDB_USERWR;
1203 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data,
1204 sizeof(int)) != sizeof(int))
1207 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
1208 p->p_pid, addr, data);
1216 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp,
1217 sizeof(int)) != sizeof(int))
1220 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
1221 p->p_pid, addr, tmp);
1222 td->td_retval[0] = tmp;
1227 #ifdef COMPAT_FREEBSD32
1230 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
1231 iov.iov_len = piod32->piod_len;
1232 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
1233 uio.uio_resid = piod32->piod_len;
1238 iov.iov_base = piod->piod_addr;
1239 iov.iov_len = piod->piod_len;
1240 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
1241 uio.uio_resid = piod->piod_len;
1245 uio.uio_segflg = UIO_USERSPACE;
1247 #ifdef COMPAT_FREEBSD32
1248 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
1250 tmp = piod->piod_op;
1255 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
1256 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1257 uio.uio_rw = UIO_READ;
1261 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
1262 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1263 td2->td_dbgflags |= TDB_USERWR;
1264 uio.uio_rw = UIO_WRITE;
1271 error = proc_rwmem(p, &uio);
1272 #ifdef COMPAT_FREEBSD32
1274 piod32->piod_len -= uio.uio_resid;
1277 piod->piod_len -= uio.uio_resid;
1282 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
1284 goto sendsig; /* in PT_CONTINUE above */
1287 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
1289 td2->td_dbgflags |= TDB_USERWR;
1290 error = PROC_WRITE(regs, td2, addr);
1294 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
1296 error = PROC_READ(regs, td2, addr);
1300 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
1302 td2->td_dbgflags |= TDB_USERWR;
1303 error = PROC_WRITE(fpregs, td2, addr);
1307 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
1309 error = PROC_READ(fpregs, td2, addr);
1313 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
1315 td2->td_dbgflags |= TDB_USERWR;
1316 error = PROC_WRITE(dbregs, td2, addr);
1320 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
1322 error = PROC_READ(dbregs, td2, addr);
1327 #ifdef COMPAT_FREEBSD32
1328 (!wrap32 && data > sizeof(*pl)) ||
1329 (wrap32 && data > sizeof(*pl32))) {
1331 data > sizeof(*pl)) {
1336 #ifdef COMPAT_FREEBSD32
1343 bzero(pl, sizeof(*pl));
1344 pl->pl_lwpid = td2->td_tid;
1345 pl->pl_event = PL_EVENT_NONE;
1347 if (td2->td_dbgflags & TDB_XSIG) {
1348 pl->pl_event = PL_EVENT_SIGNAL;
1349 if (td2->td_si.si_signo != 0 &&
1350 #ifdef COMPAT_FREEBSD32
1351 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
1352 pl_siginfo) + sizeof(pl->pl_siginfo)) ||
1353 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
1354 pl_siginfo) + sizeof(struct siginfo32)))
1356 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
1357 + sizeof(pl->pl_siginfo)
1360 pl->pl_flags |= PL_FLAG_SI;
1361 pl->pl_siginfo = td2->td_si;
1364 if (td2->td_dbgflags & TDB_SCE)
1365 pl->pl_flags |= PL_FLAG_SCE;
1366 else if (td2->td_dbgflags & TDB_SCX)
1367 pl->pl_flags |= PL_FLAG_SCX;
1368 if (td2->td_dbgflags & TDB_EXEC)
1369 pl->pl_flags |= PL_FLAG_EXEC;
1370 if (td2->td_dbgflags & TDB_FORK) {
1371 pl->pl_flags |= PL_FLAG_FORKED;
1372 pl->pl_child_pid = td2->td_dbg_forked;
1373 if (td2->td_dbgflags & TDB_VFORK)
1374 pl->pl_flags |= PL_FLAG_VFORKED;
1375 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) ==
1377 pl->pl_flags |= PL_FLAG_VFORK_DONE;
1378 if (td2->td_dbgflags & TDB_CHILD)
1379 pl->pl_flags |= PL_FLAG_CHILD;
1380 if (td2->td_dbgflags & TDB_BORN)
1381 pl->pl_flags |= PL_FLAG_BORN;
1382 if (td2->td_dbgflags & TDB_EXIT)
1383 pl->pl_flags |= PL_FLAG_EXITED;
1384 pl->pl_sigmask = td2->td_sigmask;
1385 pl->pl_siglist = td2->td_siglist;
1386 strcpy(pl->pl_tdname, td2->td_name);
1387 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
1388 pl->pl_syscall_code = td2->td_sa.code;
1389 pl->pl_syscall_narg = td2->td_sa.narg;
1391 pl->pl_syscall_code = 0;
1392 pl->pl_syscall_narg = 0;
1394 #ifdef COMPAT_FREEBSD32
1396 ptrace_lwpinfo_to32(pl, pl32);
1399 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
1400 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
1401 pl->pl_child_pid, pl->pl_syscall_code);
1405 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
1407 td->td_retval[0] = p->p_numthreads;
1411 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
1412 p->p_pid, data, p->p_numthreads);
1417 num = imin(p->p_numthreads, data);
1419 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
1422 FOREACH_THREAD_IN_PROC(p, td2) {
1425 buf[tmp++] = td2->td_tid;
1428 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
1431 td->td_retval[0] = tmp;
1435 case PT_VM_TIMESTAMP:
1436 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
1437 p->p_pid, p->p_vmspace->vm_map.timestamp);
1438 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
1443 #ifdef COMPAT_FREEBSD32
1445 error = ptrace_vm_entry32(td, p, addr);
1448 error = ptrace_vm_entry(td, p, addr);
1453 #ifdef __HAVE_PTRACE_MACHDEP
1454 if (req >= PT_FIRSTMACH) {
1456 error = cpu_ptrace(td2, req, addr, data);
1460 /* Unknown request. */
1466 /* Drop our hold on this process now that the request has completed. */
1470 if (proctree_locked)
1471 sx_xunlock(&proctree_lock);
1478 * Stop a process because of a debugging event;
1479 * stay stopped until p->p_step is cleared
1480 * (cleared by PIOCCONT in procfs).
1483 stopevent(struct proc *p, unsigned int event, unsigned int val)
1486 PROC_LOCK_ASSERT(p, MA_OWNED);
1488 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
1491 if (event != S_EXIT)
1493 p->p_xthread = NULL;
1494 p->p_stype = event; /* Which event caused the stop? */
1495 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */
1496 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
1497 } while (p->p_step);