10Sstevel@tonic-gate /*
20Sstevel@tonic-gate * CDDL HEADER START
30Sstevel@tonic-gate *
40Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*5891Sraf * Common Development and Distribution License (the "License").
6*5891Sraf * You may not use this file except in compliance with the License.
70Sstevel@tonic-gate *
80Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
90Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
100Sstevel@tonic-gate * See the License for the specific language governing permissions
110Sstevel@tonic-gate * and limitations under the License.
120Sstevel@tonic-gate *
130Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
140Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
150Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
160Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
170Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
180Sstevel@tonic-gate *
190Sstevel@tonic-gate * CDDL HEADER END
200Sstevel@tonic-gate */
21*5891Sraf
220Sstevel@tonic-gate /*
23*5891Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
240Sstevel@tonic-gate * Use is subject to license terms.
250Sstevel@tonic-gate */
260Sstevel@tonic-gate
270Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI"
280Sstevel@tonic-gate
290Sstevel@tonic-gate #include "misc.h"
300Sstevel@tonic-gate #include <ucontext.h>
310Sstevel@tonic-gate #include <sys/frame.h>
320Sstevel@tonic-gate #include <sys/stack.h>
330Sstevel@tonic-gate #include <stdio.h>
340Sstevel@tonic-gate
350Sstevel@tonic-gate #if defined(__sparc) || defined(__sparcv9)
360Sstevel@tonic-gate extern void flush_windows(void);
370Sstevel@tonic-gate #define UMEM_FRAMESIZE MINFRAME
380Sstevel@tonic-gate
390Sstevel@tonic-gate #elif defined(__i386) || defined(__amd64)
400Sstevel@tonic-gate /*
410Sstevel@tonic-gate * On x86, MINFRAME is defined to be 0, but we want to be sure we can
420Sstevel@tonic-gate * dereference the entire frame structure.
430Sstevel@tonic-gate */
440Sstevel@tonic-gate #define UMEM_FRAMESIZE (sizeof (struct frame))
450Sstevel@tonic-gate
460Sstevel@tonic-gate #else
470Sstevel@tonic-gate #error needs update for new architecture
480Sstevel@tonic-gate #endif
490Sstevel@tonic-gate
500Sstevel@tonic-gate /*
510Sstevel@tonic-gate * Get a pc-only stacktrace. Used for kmem_alloc() buffer ownership tracking.
520Sstevel@tonic-gate * Returns MIN(current stack depth, pcstack_limit).
530Sstevel@tonic-gate */
540Sstevel@tonic-gate /*ARGSUSED*/
550Sstevel@tonic-gate int
getpcstack(uintptr_t * pcstack,int pcstack_limit,int check_signal)560Sstevel@tonic-gate getpcstack(uintptr_t *pcstack, int pcstack_limit, int check_signal)
570Sstevel@tonic-gate {
580Sstevel@tonic-gate struct frame *fp;
590Sstevel@tonic-gate struct frame *nextfp, *minfp;
600Sstevel@tonic-gate int depth = 0;
610Sstevel@tonic-gate uintptr_t base = 0;
620Sstevel@tonic-gate size_t size = 0;
630Sstevel@tonic-gate #ifndef UMEM_STANDALONE
640Sstevel@tonic-gate int on_altstack = 0;
650Sstevel@tonic-gate uintptr_t sigbase = 0;
660Sstevel@tonic-gate size_t sigsize = 0;
670Sstevel@tonic-gate
680Sstevel@tonic-gate stack_t st;
690Sstevel@tonic-gate
700Sstevel@tonic-gate if (stack_getbounds(&st) != 0) {
710Sstevel@tonic-gate if (thr_stksegment(&st) != 0 ||
720Sstevel@tonic-gate (uintptr_t)st.ss_sp < st.ss_size) {
730Sstevel@tonic-gate return (0); /* unable to get stack bounds */
740Sstevel@tonic-gate }
750Sstevel@tonic-gate /*
760Sstevel@tonic-gate * thr_stksegment(3C) has a slightly different interface than
770Sstevel@tonic-gate * stack_getbounds(3C) -- correct it
780Sstevel@tonic-gate */
790Sstevel@tonic-gate st.ss_sp = (void *)(((uintptr_t)st.ss_sp) - st.ss_size);
800Sstevel@tonic-gate st.ss_flags = 0; /* can't be on-stack */
810Sstevel@tonic-gate }
820Sstevel@tonic-gate on_altstack = (st.ss_flags & SS_ONSTACK);
830Sstevel@tonic-gate
840Sstevel@tonic-gate if (st.ss_size != 0) {
850Sstevel@tonic-gate base = (uintptr_t)st.ss_sp;
860Sstevel@tonic-gate size = st.ss_size;
870Sstevel@tonic-gate } else {
880Sstevel@tonic-gate /*
890Sstevel@tonic-gate * If size == 0, then ss_sp is the *top* of the stack.
900Sstevel@tonic-gate *
910Sstevel@tonic-gate * Since we only allow increasing frame pointers, and we
920Sstevel@tonic-gate * know our caller set his up correctly, we can treat ss_sp
930Sstevel@tonic-gate * as an upper bound safely.
940Sstevel@tonic-gate */
950Sstevel@tonic-gate base = 0;
960Sstevel@tonic-gate size = (uintptr_t)st.ss_sp;
970Sstevel@tonic-gate }
980Sstevel@tonic-gate
990Sstevel@tonic-gate if (check_signal != 0) {
1000Sstevel@tonic-gate void (*sigfunc)() = NULL;
1010Sstevel@tonic-gate int sigfuncsize = 0;
1020Sstevel@tonic-gate extern void thr_sighndlrinfo(void (**)(), int *);
1030Sstevel@tonic-gate
1040Sstevel@tonic-gate thr_sighndlrinfo(&sigfunc, &sigfuncsize);
1050Sstevel@tonic-gate sigbase = (uintptr_t)sigfunc;
1060Sstevel@tonic-gate sigsize = sigfuncsize;
1070Sstevel@tonic-gate }
1080Sstevel@tonic-gate #else /* UMEM_STANDALONE */
1090Sstevel@tonic-gate base = (uintptr_t)umem_min_stack;
1100Sstevel@tonic-gate size = umem_max_stack - umem_min_stack;
1110Sstevel@tonic-gate #endif
1120Sstevel@tonic-gate
1130Sstevel@tonic-gate /*
1140Sstevel@tonic-gate * shorten size so that fr_savfp and fr_savpc will be within the stack
1150Sstevel@tonic-gate * bounds.
1160Sstevel@tonic-gate */
1170Sstevel@tonic-gate if (size >= UMEM_FRAMESIZE - 1)
1180Sstevel@tonic-gate size -= (UMEM_FRAMESIZE - 1);
1190Sstevel@tonic-gate else
1200Sstevel@tonic-gate size = 0;
1210Sstevel@tonic-gate
1220Sstevel@tonic-gate #if defined(__sparc) || defined(__sparcv9)
1230Sstevel@tonic-gate flush_windows();
1240Sstevel@tonic-gate #endif
1250Sstevel@tonic-gate
1260Sstevel@tonic-gate /* LINTED alignment */
1270Sstevel@tonic-gate fp = (struct frame *)((caddr_t)getfp() + STACK_BIAS);
1280Sstevel@tonic-gate
1290Sstevel@tonic-gate minfp = fp;
1300Sstevel@tonic-gate
1310Sstevel@tonic-gate if (((uintptr_t)fp - base) >= size)
1320Sstevel@tonic-gate return (0); /* the frame pointer isn't in our stack */
1330Sstevel@tonic-gate
1340Sstevel@tonic-gate while (depth < pcstack_limit) {
1350Sstevel@tonic-gate uintptr_t tmp;
1360Sstevel@tonic-gate
1370Sstevel@tonic-gate /* LINTED alignment */
1380Sstevel@tonic-gate nextfp = (struct frame *)((caddr_t)fp->fr_savfp + STACK_BIAS);
1390Sstevel@tonic-gate tmp = (uintptr_t)nextfp;
1400Sstevel@tonic-gate
1410Sstevel@tonic-gate /*
1420Sstevel@tonic-gate * Check nextfp for validity. It must be properly aligned,
1430Sstevel@tonic-gate * increasing compared to the last %fp (or the top of the
1440Sstevel@tonic-gate * stack we just switched to), and it must be inside
1450Sstevel@tonic-gate * [base, base + size).
1460Sstevel@tonic-gate */
1470Sstevel@tonic-gate if (tmp != SA(tmp))
1480Sstevel@tonic-gate break;
1490Sstevel@tonic-gate else if (nextfp <= minfp || (tmp - base) >= size) {
1500Sstevel@tonic-gate #ifndef UMEM_STANDALONE
1510Sstevel@tonic-gate if (tmp == NULL || !on_altstack)
1520Sstevel@tonic-gate break;
1530Sstevel@tonic-gate /*
1540Sstevel@tonic-gate * If we're on an alternate signal stack, try jumping
1550Sstevel@tonic-gate * to the main thread stack.
1560Sstevel@tonic-gate *
1570Sstevel@tonic-gate * If the main thread stack has an unlimited size, we
1580Sstevel@tonic-gate * punt, since we don't know where the frame pointer's
1590Sstevel@tonic-gate * been.
1600Sstevel@tonic-gate *
1610Sstevel@tonic-gate * (thr_stksegment() returns the *top of stack*
1620Sstevel@tonic-gate * in ss_sp, not the bottom)
1630Sstevel@tonic-gate */
1640Sstevel@tonic-gate if (thr_stksegment(&st) == 0) {
1650Sstevel@tonic-gate if (st.ss_size >= (uintptr_t)st.ss_sp ||
1660Sstevel@tonic-gate st.ss_size < UMEM_FRAMESIZE - 1)
1670Sstevel@tonic-gate break;
1680Sstevel@tonic-gate
1690Sstevel@tonic-gate on_altstack = 0;
1700Sstevel@tonic-gate base = (uintptr_t)st.ss_sp - st.ss_size;
1710Sstevel@tonic-gate size = st.ss_size - (UMEM_FRAMESIZE - 1);
1720Sstevel@tonic-gate minfp = (struct frame *)base;
1730Sstevel@tonic-gate continue; /* try again */
1740Sstevel@tonic-gate }
1750Sstevel@tonic-gate #endif
1760Sstevel@tonic-gate break;
1770Sstevel@tonic-gate }
1780Sstevel@tonic-gate
1790Sstevel@tonic-gate #ifndef UMEM_STANDALONE
1800Sstevel@tonic-gate if (check_signal && (fp->fr_savpc - sigbase) <= sigsize)
1810Sstevel@tonic-gate umem_panic("called from signal handler");
1820Sstevel@tonic-gate #endif
1830Sstevel@tonic-gate pcstack[depth++] = fp->fr_savpc;
1840Sstevel@tonic-gate fp = nextfp;
1850Sstevel@tonic-gate minfp = fp;
1860Sstevel@tonic-gate }
1870Sstevel@tonic-gate return (depth);
1880Sstevel@tonic-gate }
189