2 * SPDX-License-Identifier: BSD-4-Clause
4 * Copyright (c) 1994, Sean Eric Fagan
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Sean Eric Fagan.
18 * 4. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include <sys/param.h>
38 #include <sys/systm.h>
40 #include <sys/limits.h>
42 #include <sys/mutex.h>
43 #include <sys/syscallsubr.h>
44 #include <sys/sysent.h>
45 #include <sys/sysproto.h>
48 #include <sys/vnode.h>
49 #include <sys/ptrace.h>
50 #include <sys/rwlock.h>
52 #include <sys/malloc.h>
53 #include <sys/signalvar.h>
55 #include <machine/reg.h>
57 #include <security/audit/audit.h>
61 #include <vm/vm_extern.h>
62 #include <vm/vm_map.h>
63 #include <vm/vm_kern.h>
64 #include <vm/vm_object.h>
65 #include <vm/vm_page.h>
66 #include <vm/vm_param.h>
68 #ifdef COMPAT_FREEBSD32
69 #include <sys/procfs.h>
73 * Functions implemented using PROC_ACTION():
75 * proc_read_regs(proc, regs)
76 * Get the current user-visible register set from the process
77 * and copy it into the regs structure (<machine/reg.h>).
78 * The process is stopped at the time read_regs is called.
80 * proc_write_regs(proc, regs)
81 * Update the current register set from the passed in regs
82 * structure. Take care to avoid clobbering special CPU
83 * registers or privileged bits in the PSL.
84 * Depending on the architecture this may have fix-up work to do,
85 * especially if the IAR or PCW are modified.
86 * The process is stopped at the time write_regs is called.
88 * proc_read_fpregs, proc_write_fpregs
89 * deal with the floating point register set, otherwise as above.
91 * proc_read_dbregs, proc_write_dbregs
92 * deal with the processor debug register set, otherwise as above.
95 * Arrange for the process to trap after executing a single instruction.
98 #define PROC_ACTION(action) do { \
101 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \
102 if ((td->td_proc->p_flag & P_INMEM) == 0) \
110 proc_read_regs(struct thread *td, struct reg *regs)
113 PROC_ACTION(fill_regs(td, regs));
117 proc_write_regs(struct thread *td, struct reg *regs)
120 PROC_ACTION(set_regs(td, regs));
124 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
127 PROC_ACTION(fill_dbregs(td, dbregs));
131 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
134 PROC_ACTION(set_dbregs(td, dbregs));
138 * Ptrace doesn't support fpregs at all, and there are no security holes
139 * or translations for fpregs, so we can just copy them.
142 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
145 PROC_ACTION(fill_fpregs(td, fpregs));
149 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
152 PROC_ACTION(set_fpregs(td, fpregs));
155 #ifdef COMPAT_FREEBSD32
156 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
158 proc_read_regs32(struct thread *td, struct reg32 *regs32)
161 PROC_ACTION(fill_regs32(td, regs32));
165 proc_write_regs32(struct thread *td, struct reg32 *regs32)
168 PROC_ACTION(set_regs32(td, regs32));
172 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
175 PROC_ACTION(fill_dbregs32(td, dbregs32));
179 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
182 PROC_ACTION(set_dbregs32(td, dbregs32));
186 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
189 PROC_ACTION(fill_fpregs32(td, fpregs32));
193 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
196 PROC_ACTION(set_fpregs32(td, fpregs32));
201 proc_sstep(struct thread *td)
204 PROC_ACTION(ptrace_single_step(td));
208 proc_rwmem(struct proc *p, struct uio *uio)
211 vm_offset_t pageno; /* page number */
213 int error, fault_flags, page_offset, writing;
216 * Assert that someone has locked this vmspace. (Should be
217 * curthread but we can't assert that.) This keeps the process
218 * from exiting out from under us until this operation completes.
221 PROC_LOCK_ASSERT(p, MA_NOTOWNED);
226 map = &p->p_vmspace->vm_map;
229 * If we are writing, then we request vm_fault() to create a private
230 * copy of each page. Since these copies will not be writeable by the
231 * process, we must explicity request that they be dirtied.
233 writing = uio->uio_rw == UIO_WRITE;
234 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
235 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
238 * Only map in one page at a time. We don't have to, but it
239 * makes things easier. This way is trivial - right?
246 uva = (vm_offset_t)uio->uio_offset;
249 * Get the page number of this segment.
251 pageno = trunc_page(uva);
252 page_offset = uva - pageno;
255 * How many bytes to copy
257 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
260 * Fault and hold the page on behalf of the process.
262 error = vm_fault(map, pageno, reqprot, fault_flags, &m);
263 if (error != KERN_SUCCESS) {
264 if (error == KERN_RESOURCE_SHORTAGE)
272 * Now do the i/o move.
274 error = uiomove_fromphys(&m, page_offset, len, uio);
276 /* Make the I-cache coherent for breakpoints. */
277 if (writing && error == 0) {
278 vm_map_lock_read(map);
279 if (vm_map_check_protection(map, pageno, pageno +
280 PAGE_SIZE, VM_PROT_EXECUTE))
281 vm_sync_icache(map, uva, len);
282 vm_map_unlock_read(map);
288 vm_page_unwire(m, PQ_ACTIVE);
290 } while (error == 0 && uio->uio_resid > 0);
296 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
297 size_t len, enum uio_rw rw)
303 MPASS(len < SSIZE_MAX);
306 iov.iov_base = (caddr_t)buf;
311 uio.uio_resid = slen;
312 uio.uio_segflg = UIO_SYSSPACE;
316 if (uio.uio_resid == slen)
318 return (slen - uio.uio_resid);
322 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
326 return (proc_iop(td, p, va, buf, len, UIO_READ));
330 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
334 return (proc_iop(td, p, va, buf, len, UIO_WRITE));
338 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
342 vm_map_entry_t entry;
343 vm_object_t obj, tobj, lobj;
346 char *freepath, *fullpath;
353 vm = vmspace_acquire_ref(p);
355 vm_map_lock_read(map);
358 KASSERT((map->header.eflags & MAP_ENTRY_IS_SUB_MAP) == 0,
359 ("Submap in map header"));
361 VM_MAP_ENTRY_FOREACH(entry, map) {
362 if (index >= pve->pve_entry &&
363 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) == 0)
367 if (index < pve->pve_entry) {
371 if (entry == &map->header) {
376 /* We got an entry. */
377 pve->pve_entry = index + 1;
378 pve->pve_timestamp = map->timestamp;
379 pve->pve_start = entry->start;
380 pve->pve_end = entry->end - 1;
381 pve->pve_offset = entry->offset;
382 pve->pve_prot = entry->protection;
384 /* Backing object's path needed? */
385 if (pve->pve_pathlen == 0)
388 pathlen = pve->pve_pathlen;
389 pve->pve_pathlen = 0;
391 obj = entry->object.vm_object;
393 VM_OBJECT_RLOCK(obj);
396 vm_map_unlock_read(map);
398 pve->pve_fsid = VNOVAL;
399 pve->pve_fileid = VNOVAL;
401 if (error == 0 && obj != NULL) {
403 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
405 VM_OBJECT_RLOCK(tobj);
407 VM_OBJECT_RUNLOCK(lobj);
409 pve->pve_offset += tobj->backing_object_offset;
411 vp = vm_object_vnode(lobj);
415 VM_OBJECT_RUNLOCK(lobj);
416 VM_OBJECT_RUNLOCK(obj);
421 vn_fullpath(vp, &fullpath, &freepath);
422 vn_lock(vp, LK_SHARED | LK_RETRY);
423 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
424 pve->pve_fileid = vattr.va_fileid;
425 pve->pve_fsid = vattr.va_fsid;
429 if (fullpath != NULL) {
430 pve->pve_pathlen = strlen(fullpath) + 1;
431 if (pve->pve_pathlen <= pathlen) {
432 error = copyout(fullpath, pve->pve_path,
435 error = ENAMETOOLONG;
437 if (freepath != NULL)
438 free(freepath, M_TEMP);
443 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
444 p->p_pid, pve->pve_entry, pve->pve_start);
450 * Process debugging system call.
452 #ifndef _SYS_SYSPROTO_H_
462 sys_ptrace(struct thread *td, struct ptrace_args *uap)
465 * XXX this obfuscation is to reduce stack usage, but the register
466 * structs may be too large to put on the stack anyway.
469 struct ptrace_io_desc piod;
470 struct ptrace_lwpinfo pl;
471 struct ptrace_vm_entry pve;
475 char args[sizeof(td->td_sa.args)];
476 struct ptrace_sc_ret psr;
482 AUDIT_ARG_PID(uap->pid);
483 AUDIT_ARG_CMD(uap->req);
484 AUDIT_ARG_VALUE(uap->data);
487 case PT_GET_EVENT_MASK:
493 bzero(&r.reg, sizeof(r.reg));
496 bzero(&r.fpreg, sizeof(r.fpreg));
499 bzero(&r.dbreg, sizeof(r.dbreg));
502 error = copyin(uap->addr, &r.reg, sizeof(r.reg));
505 error = copyin(uap->addr, &r.fpreg, sizeof(r.fpreg));
508 error = copyin(uap->addr, &r.dbreg, sizeof(r.dbreg));
510 case PT_SET_EVENT_MASK:
511 if (uap->data != sizeof(r.ptevents))
514 error = copyin(uap->addr, &r.ptevents, uap->data);
517 error = copyin(uap->addr, &r.piod, sizeof(r.piod));
520 error = copyin(uap->addr, &r.pve, sizeof(r.pve));
529 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
535 error = copyout(&r.pve, uap->addr, sizeof(r.pve));
538 error = copyout(&r.piod, uap->addr, sizeof(r.piod));
541 error = copyout(&r.reg, uap->addr, sizeof(r.reg));
544 error = copyout(&r.fpreg, uap->addr, sizeof(r.fpreg));
547 error = copyout(&r.dbreg, uap->addr, sizeof(r.dbreg));
549 case PT_GET_EVENT_MASK:
550 /* NB: The size in uap->data is validated in kern_ptrace(). */
551 error = copyout(&r.ptevents, uap->addr, uap->data);
554 /* NB: The size in uap->data is validated in kern_ptrace(). */
555 error = copyout(&r.pl, uap->addr, uap->data);
558 error = copyout(r.args, uap->addr, MIN(uap->data,
562 error = copyout(&r.psr, uap->addr, MIN(uap->data,
570 #ifdef COMPAT_FREEBSD32
572 * PROC_READ(regs, td2, addr);
574 * proc_read_regs(td2, addr);
576 * proc_read_regs32(td2, addr);
577 * .. except this is done at runtime. There is an additional
578 * complication in that PROC_WRITE disallows 32 bit consumers
579 * from writing to 64 bit address space targets.
581 #define PROC_READ(w, t, a) wrap32 ? \
582 proc_read_ ## w ## 32(t, a) : \
583 proc_read_ ## w (t, a)
584 #define PROC_WRITE(w, t, a) wrap32 ? \
585 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
586 proc_write_ ## w (t, a)
588 #define PROC_READ(w, t, a) proc_read_ ## w (t, a)
589 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a)
593 proc_set_traced(struct proc *p, bool stop)
596 sx_assert(&proctree_lock, SX_XLOCKED);
597 PROC_LOCK_ASSERT(p, MA_OWNED);
598 p->p_flag |= P_TRACED;
600 p->p_flag2 |= P2_PTRACE_FSTP;
601 p->p_ptevents = PTRACE_DEFAULT;
605 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
609 struct proc *curp, *p, *pp;
610 struct thread *td2 = NULL, *td3;
611 struct ptrace_io_desc *piod = NULL;
612 struct ptrace_lwpinfo *pl;
613 struct ptrace_sc_ret *psr;
615 int proctree_locked = 0;
616 lwpid_t tid = 0, *buf;
617 #ifdef COMPAT_FREEBSD32
618 int wrap32 = 0, safe = 0;
623 /* Lock proctree before locking the process. */
634 case PT_GET_EVENT_MASK:
635 case PT_SET_EVENT_MASK:
638 sx_xlock(&proctree_lock);
645 if (req == PT_TRACE_ME) {
649 if (pid <= PID_MAX) {
650 if ((p = pfind(pid)) == NULL) {
652 sx_xunlock(&proctree_lock);
656 td2 = tdfind(pid, -1);
659 sx_xunlock(&proctree_lock);
667 AUDIT_ARG_PROCESS(p);
669 if ((p->p_flag & P_WEXIT) != 0) {
673 if ((error = p_cansee(td, p)) != 0)
676 if ((error = p_candebug(td, p)) != 0)
680 * System processes can't be debugged.
682 if ((p->p_flag & P_SYSTEM) != 0) {
688 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
689 KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
692 td2 = FIRST_THREAD_IN_PROC(p);
697 #ifdef COMPAT_FREEBSD32
699 * Test if we're a 32 bit client and what the target is.
700 * Set the wrap controls accordingly.
702 if (SV_CURPROC_FLAG(SV_ILP32)) {
703 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
714 * Always legal, when there is a parent process which
715 * could trace us. Otherwise, reject.
717 if ((p->p_flag & P_TRACED) != 0) {
721 if (p->p_pptr == initproc) {
729 if (p == td->td_proc) {
735 if (p->p_flag & P_TRACED) {
740 /* Can't trace an ancestor if you're being traced. */
741 if (curp->p_flag & P_TRACED) {
742 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
754 /* Allow thread to clear single step for itself */
755 if (td->td_tid == tid)
760 /* not being traced... */
761 if ((p->p_flag & P_TRACED) == 0) {
766 /* not being traced by YOU */
767 if (p->p_pptr != td->td_proc) {
772 /* not currently stopped */
773 if ((p->p_flag & P_STOPPED_TRACE) == 0 ||
774 p->p_suspcount != p->p_numthreads ||
775 (p->p_flag & P_WAITED) == 0) {
784 /* Keep this process around until we finish this request. */
788 * Actually do the requests
791 td->td_retval[0] = 0;
795 /* set my trace flag and "owner" so it can read/write me */
796 proc_set_traced(p, false);
797 if (p->p_flag & P_PPWAIT)
798 p->p_flag |= P_PPTRACE;
799 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
803 /* security check done above */
805 * It would be nice if the tracing relationship was separate
806 * from the parent relationship but that would require
807 * another set of links in the proc struct or for "wait"
808 * to scan the entire proc table. To make life easier,
809 * we just re-parent the process we're trying to trace.
810 * The old parent is remembered so we can put things back
813 proc_set_traced(p, true);
814 proc_reparent(p, td->td_proc, false);
815 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
818 sx_xunlock(&proctree_lock);
820 MPASS(p->p_xthread == NULL);
821 MPASS((p->p_flag & P_STOPPED_TRACE) == 0);
824 * If already stopped due to a stop signal, clear the
825 * existing stop before triggering a traced SIGSTOP.
827 if ((p->p_flag & P_STOPPED_SIG) != 0) {
829 p->p_flag &= ~(P_STOPPED_SIG | P_WAITED);
834 kern_psignal(p, SIGSTOP);
838 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
840 error = ptrace_clear_single_step(td2);
844 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
846 error = ptrace_single_step(td2);
850 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
852 td2->td_dbgflags |= TDB_SUSPEND;
854 td2->td_flags |= TDF_NEEDSUSPCHK;
859 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
861 td2->td_dbgflags &= ~TDB_SUSPEND;
865 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
866 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled",
867 data ? "enabled" : "disabled");
869 p->p_ptevents |= PTRACE_FORK;
871 p->p_ptevents &= ~PTRACE_FORK;
875 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid,
876 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled",
877 data ? "enabled" : "disabled");
879 p->p_ptevents |= PTRACE_LWP;
881 p->p_ptevents &= ~PTRACE_LWP;
884 case PT_GET_EVENT_MASK:
885 if (data != sizeof(p->p_ptevents)) {
889 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid,
891 *(int *)addr = p->p_ptevents;
894 case PT_SET_EVENT_MASK:
895 if (data != sizeof(p->p_ptevents)) {
900 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX |
901 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) {
905 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x",
906 p->p_pid, p->p_ptevents, tmp);
911 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid);
912 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0
913 #ifdef COMPAT_FREEBSD32
920 bzero(addr, sizeof(td2->td_sa.args));
921 bcopy(td2->td_sa.args, addr, td2->td_sa.callp->sy_narg *
926 if ((td2->td_dbgflags & (TDB_SCX)) == 0
927 #ifdef COMPAT_FREEBSD32
935 bzero(psr, sizeof(*psr));
936 psr->sr_error = td2->td_errno;
937 if (psr->sr_error == 0) {
938 psr->sr_retval[0] = td2->td_retval[0];
939 psr->sr_retval[1] = td2->td_retval[1];
942 "PT_GET_SC_RET: pid %d error %d retval %#lx,%#lx",
943 p->p_pid, psr->sr_error, psr->sr_retval[0],
953 /* Zero means do not send any signal */
954 if (data < 0 || data > _SIG_MAXSIG) {
961 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d",
962 td2->td_tid, p->p_pid, data);
963 error = ptrace_single_step(td2);
971 if (addr != (void *)1) {
972 error = ptrace_set_pc(td2,
973 (u_long)(uintfptr_t)addr);
979 p->p_ptevents |= PTRACE_SCE;
981 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d",
982 p->p_pid, p->p_ptevents,
983 (u_long)(uintfptr_t)addr, data);
986 p->p_ptevents |= PTRACE_SCX;
988 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d",
989 p->p_pid, p->p_ptevents,
990 (u_long)(uintfptr_t)addr, data);
993 p->p_ptevents |= PTRACE_SYSCALL;
995 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d",
996 p->p_pid, p->p_ptevents,
997 (u_long)(uintfptr_t)addr, data);
1001 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
1002 p->p_pid, (u_long)(uintfptr_t)addr, data);
1008 * Reset the process parent.
1010 * NB: This clears P_TRACED before reparenting
1011 * a detached process back to its original
1012 * parent. Otherwise the debugee will be set
1013 * as an orphan of the debugger.
1015 p->p_flag &= ~(P_TRACED | P_WAITED);
1016 if (p->p_oppid != p->p_pptr->p_pid) {
1017 PROC_LOCK(p->p_pptr);
1018 sigqueue_take(p->p_ksi);
1019 PROC_UNLOCK(p->p_pptr);
1021 pp = proc_realparent(p);
1022 proc_reparent(p, pp, false);
1024 p->p_sigparent = SIGCHLD;
1026 "PT_DETACH: pid %d reparented to pid %d, sig %d",
1027 p->p_pid, pp->p_pid, data);
1029 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
1032 FOREACH_THREAD_IN_PROC(p, td3) {
1033 if ((td3->td_dbgflags & TDB_FSTP) != 0) {
1034 sigqueue_delete(&td3->td_sigqueue,
1037 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP |
1041 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) {
1042 sigqueue_delete(&p->p_sigqueue, SIGSTOP);
1043 p->p_flag2 &= ~P2_PTRACE_FSTP;
1046 /* should we send SIGCHLD? */
1047 /* childproc_continued(p); */
1051 sx_xunlock(&proctree_lock);
1052 proctree_locked = 0;
1055 MPASS(proctree_locked == 0);
1058 * Clear the pending event for the thread that just
1059 * reported its event (p_xthread). This may not be
1060 * the thread passed to PT_CONTINUE, PT_STEP, etc. if
1061 * the debugger is resuming a different thread.
1063 * Deliver any pending signal via the reporting thread.
1065 MPASS(p->p_xthread != NULL);
1066 p->p_xthread->td_dbgflags &= ~TDB_XSIG;
1067 p->p_xthread->td_xsig = data;
1068 p->p_xthread = NULL;
1072 * P_WKILLED is insurance that a PT_KILL/SIGKILL
1073 * always works immediately, even if another thread is
1074 * unsuspended first and attempts to handle a
1075 * different signal or if the POSIX.1b style signal
1076 * queue cannot accommodate any new signals.
1078 if (data == SIGKILL)
1082 * Unsuspend all threads. To leave a thread
1083 * suspended, use PT_SUSPEND to suspend it before
1084 * continuing the process.
1087 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED);
1088 thread_unsuspend(p);
1094 td2->td_dbgflags |= TDB_USERWR;
1097 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data,
1098 sizeof(int)) != sizeof(int))
1101 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
1102 p->p_pid, addr, data);
1110 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp,
1111 sizeof(int)) != sizeof(int))
1114 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
1115 p->p_pid, addr, tmp);
1116 td->td_retval[0] = tmp;
1122 iov.iov_base = piod->piod_addr;
1123 iov.iov_len = piod->piod_len;
1124 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
1125 uio.uio_resid = piod->piod_len;
1128 uio.uio_segflg = UIO_USERSPACE;
1130 switch (piod->piod_op) {
1133 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
1134 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1135 uio.uio_rw = UIO_READ;
1139 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
1140 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1141 td2->td_dbgflags |= TDB_USERWR;
1142 uio.uio_rw = UIO_WRITE;
1149 error = proc_rwmem(p, &uio);
1150 piod->piod_len -= uio.uio_resid;
1155 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
1157 goto sendsig; /* in PT_CONTINUE above */
1160 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
1162 td2->td_dbgflags |= TDB_USERWR;
1163 error = PROC_WRITE(regs, td2, addr);
1167 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
1169 error = PROC_READ(regs, td2, addr);
1173 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
1175 td2->td_dbgflags |= TDB_USERWR;
1176 error = PROC_WRITE(fpregs, td2, addr);
1180 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
1182 error = PROC_READ(fpregs, td2, addr);
1186 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
1188 td2->td_dbgflags |= TDB_USERWR;
1189 error = PROC_WRITE(dbregs, td2, addr);
1193 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
1195 error = PROC_READ(dbregs, td2, addr);
1199 if (data <= 0 || data > sizeof(*pl)) {
1204 bzero(pl, sizeof(*pl));
1205 pl->pl_lwpid = td2->td_tid;
1206 pl->pl_event = PL_EVENT_NONE;
1208 if (td2->td_dbgflags & TDB_XSIG) {
1209 pl->pl_event = PL_EVENT_SIGNAL;
1210 if (td2->td_si.si_signo != 0 &&
1211 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
1212 + sizeof(pl->pl_siginfo)){
1213 pl->pl_flags |= PL_FLAG_SI;
1214 pl->pl_siginfo = td2->td_si;
1217 if (td2->td_dbgflags & TDB_SCE)
1218 pl->pl_flags |= PL_FLAG_SCE;
1219 else if (td2->td_dbgflags & TDB_SCX)
1220 pl->pl_flags |= PL_FLAG_SCX;
1221 if (td2->td_dbgflags & TDB_EXEC)
1222 pl->pl_flags |= PL_FLAG_EXEC;
1223 if (td2->td_dbgflags & TDB_FORK) {
1224 pl->pl_flags |= PL_FLAG_FORKED;
1225 pl->pl_child_pid = td2->td_dbg_forked;
1226 if (td2->td_dbgflags & TDB_VFORK)
1227 pl->pl_flags |= PL_FLAG_VFORKED;
1228 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) ==
1230 pl->pl_flags |= PL_FLAG_VFORK_DONE;
1231 if (td2->td_dbgflags & TDB_CHILD)
1232 pl->pl_flags |= PL_FLAG_CHILD;
1233 if (td2->td_dbgflags & TDB_BORN)
1234 pl->pl_flags |= PL_FLAG_BORN;
1235 if (td2->td_dbgflags & TDB_EXIT)
1236 pl->pl_flags |= PL_FLAG_EXITED;
1237 pl->pl_sigmask = td2->td_sigmask;
1238 pl->pl_siglist = td2->td_siglist;
1239 strcpy(pl->pl_tdname, td2->td_name);
1240 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
1241 pl->pl_syscall_code = td2->td_sa.code;
1242 pl->pl_syscall_narg = td2->td_sa.callp->sy_narg;
1244 pl->pl_syscall_code = 0;
1245 pl->pl_syscall_narg = 0;
1248 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
1249 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
1250 pl->pl_child_pid, pl->pl_syscall_code);
1254 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
1256 td->td_retval[0] = p->p_numthreads;
1260 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
1261 p->p_pid, data, p->p_numthreads);
1266 num = imin(p->p_numthreads, data);
1268 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
1271 FOREACH_THREAD_IN_PROC(p, td2) {
1274 buf[tmp++] = td2->td_tid;
1277 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
1280 td->td_retval[0] = tmp;
1284 case PT_VM_TIMESTAMP:
1285 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
1286 p->p_pid, p->p_vmspace->vm_map.timestamp);
1287 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
1292 error = ptrace_vm_entry(td, p, addr);
1297 #ifdef __HAVE_PTRACE_MACHDEP
1298 if (req >= PT_FIRSTMACH) {
1300 error = cpu_ptrace(td2, req, addr, data);
1304 /* Unknown request. */
1310 /* Drop our hold on this process now that the request has completed. */
1314 if (proctree_locked)
1315 sx_xunlock(&proctree_lock);