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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Portions Copyright 2006-2008 Message Systems, Inc.
*/
/* #pragma ident "@(#)getpcstack.c 1.5 05/06/08 SMI" */
#include "config.h"
#include "misc.h"
#if HAVE_UCONTEXT_H
#include <ucontext.h>
#endif
#if HAVE_SYS_FRAME_H
#include <sys/frame.h>
#endif
#if HAVE_SYS_STACK_H
#include <sys/stack.h>
#endif
#include <stdio.h>
#if defined(__MACH__)
/*
* Darwin doesn't have any exposed frame info, so give it some space.
*/
#define UMEM_FRAMESIZE (2 * sizeof(long long))
#elif defined(__sparc) || defined(__sparcv9)
extern void flush_windows(void);
#define UMEM_FRAMESIZE MINFRAME
#elif defined(__i386) || defined(__amd64)
/*
* On x86, MINFRAME is defined to be 0, but we want to be sure we can
* dereference the entire frame structure.
*/
#define UMEM_FRAMESIZE (sizeof (struct frame))
#elif !defined(EC_UMEM_DUMMY_PCSTACK)
#error needs update for new architecture
#endif
/*
* Get a pc-only stacktrace. Used for kmem_alloc() buffer ownership tracking.
* Returns MIN(current stack depth, pcstack_limit).
*/
/*ARGSUSED*/
int
getpcstack(uintptr_t *pcstack, int pcstack_limit, int check_signal)
{
#ifdef EC_UMEM_DUMMY_PCSTACK
return 0;
#else
struct frame *fp;
struct frame *nextfp, *minfp;
int depth = 0;
uintptr_t base = 0;
size_t size = 0;
#ifndef UMEM_STANDALONE
int on_altstack = 0;
uintptr_t sigbase = 0;
size_t sigsize = 0;
stack_t st;
if (stack_getbounds(&st) != 0) {
if (thr_stksegment(&st) != 0 ||
(uintptr_t)st.ss_sp < st.ss_size) {
return (0); /* unable to get stack bounds */
}
/*
* thr_stksegment(3C) has a slightly different interface than
* stack_getbounds(3C) -- correct it
*/
st.ss_sp = (void *)(((uintptr_t)st.ss_sp) - st.ss_size);
st.ss_flags = 0; /* can't be on-stack */
}
on_altstack = (st.ss_flags & SS_ONSTACK);
if (st.ss_size != 0) {
base = (uintptr_t)st.ss_sp;
size = st.ss_size;
} else {
/*
* If size == 0, then ss_sp is the *top* of the stack.
*
* Since we only allow increasing frame pointers, and we
* know our caller set his up correctly, we can treat ss_sp
* as an upper bound safely.
*/
base = 0;
size = (uintptr_t)st.ss_sp;
}
if (check_signal != 0) {
void (*sigfunc)() = NULL;
int sigfuncsize = 0;
extern void thr_sighndlrinfo(void (**)(), int *);
thr_sighndlrinfo(&sigfunc, &sigfuncsize);
sigbase = (uintptr_t)sigfunc;
sigsize = sigfuncsize;
}
#else /* UMEM_STANDALONE */
base = (uintptr_t)umem_min_stack;
size = umem_max_stack - umem_min_stack;
#endif
/*
* shorten size so that fr_savfp and fr_savpc will be within the stack
* bounds.
*/
if (size >= UMEM_FRAMESIZE - 1)
size -= (UMEM_FRAMESIZE - 1);
else
size = 0;
#if defined(__sparc) || defined(__sparcv9)
flush_windows();
#endif
/* LINTED alignment */
fp = (struct frame *)((caddr_t)getfp() + STACK_BIAS);
minfp = fp;
if (((uintptr_t)fp - base) >= size)
return (0); /* the frame pointer isn't in our stack */
while (depth < pcstack_limit) {
uintptr_t tmp;
/* LINTED alignment */
nextfp = (struct frame *)((caddr_t)fp->fr_savfp + STACK_BIAS);
tmp = (uintptr_t)nextfp;
/*
* Check nextfp for validity. It must be properly aligned,
* increasing compared to the last %fp (or the top of the
* stack we just switched to), and it must be inside
* [base, base + size).
*/
if (tmp != SA(tmp))
break;
else if (nextfp <= minfp || (tmp - base) >= size) {
#ifndef UMEM_STANDALONE
if (tmp == NULL || !on_altstack)
break;
/*
* If we're on an alternate signal stack, try jumping
* to the main thread stack.
*
* If the main thread stack has an unlimited size, we
* punt, since we don't know where the frame pointer's
* been.
*
* (thr_stksegment() returns the *top of stack*
* in ss_sp, not the bottom)
*/
if (thr_stksegment(&st) == 0) {
if (st.ss_size >= (uintptr_t)st.ss_sp ||
st.ss_size < UMEM_FRAMESIZE - 1)
break;
on_altstack = 0;
base = (uintptr_t)st.ss_sp - st.ss_size;
size = st.ss_size - (UMEM_FRAMESIZE - 1);
minfp = (struct frame *)base;
continue; /* try again */
}
#endif
break;
}
#ifndef UMEM_STANDALONE
if (check_signal && (fp->fr_savpc - sigbase) <= sigsize)
umem_panic("called from signal handler");
#endif
pcstack[depth++] = fp->fr_savpc;
fp = nextfp;
minfp = fp;
}
return (depth);
#endif
}
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