1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate #include "thr_uberdata.h" 30*0Sstevel@tonic-gate #include <sys/stack.h> 31*0Sstevel@tonic-gate 32*0Sstevel@tonic-gate /* 33*0Sstevel@tonic-gate * Initialization of the main stack is performed in libc_init(). 34*0Sstevel@tonic-gate * Initialization of thread stacks is performed in _thr_setup(). 35*0Sstevel@tonic-gate */ 36*0Sstevel@tonic-gate 37*0Sstevel@tonic-gate #pragma weak stack_getbounds = _stack_getbounds 38*0Sstevel@tonic-gate int 39*0Sstevel@tonic-gate _stack_getbounds(stack_t *sp) 40*0Sstevel@tonic-gate { 41*0Sstevel@tonic-gate *sp = curthread->ul_ustack; 42*0Sstevel@tonic-gate return (0); 43*0Sstevel@tonic-gate } 44*0Sstevel@tonic-gate 45*0Sstevel@tonic-gate #pragma weak stack_setbounds = _stack_setbounds 46*0Sstevel@tonic-gate int 47*0Sstevel@tonic-gate _stack_setbounds(const stack_t *sp) 48*0Sstevel@tonic-gate { 49*0Sstevel@tonic-gate ulwp_t *self = curthread; 50*0Sstevel@tonic-gate 51*0Sstevel@tonic-gate if (sp == NULL || sp->ss_sp == NULL || 52*0Sstevel@tonic-gate (uintptr_t)sp->ss_sp != SA((uintptr_t)sp->ss_sp) || 53*0Sstevel@tonic-gate sp->ss_flags != 0 || sp->ss_size < MINSIGSTKSZ || 54*0Sstevel@tonic-gate (uintptr_t)sp->ss_size != SA((uintptr_t)sp->ss_size)) { 55*0Sstevel@tonic-gate errno = EINVAL; 56*0Sstevel@tonic-gate return (-1); 57*0Sstevel@tonic-gate } 58*0Sstevel@tonic-gate 59*0Sstevel@tonic-gate sigoff(self); 60*0Sstevel@tonic-gate self->ul_ustack = *sp; 61*0Sstevel@tonic-gate sigon(self); 62*0Sstevel@tonic-gate 63*0Sstevel@tonic-gate return (0); 64*0Sstevel@tonic-gate } 65*0Sstevel@tonic-gate 66*0Sstevel@tonic-gate /* 67*0Sstevel@tonic-gate * Returns a boolean value: 68*0Sstevel@tonic-gate * 1 addr is within the bounds of the current stack 69*0Sstevel@tonic-gate * 0 addr is outside of the bounds of the current stack 70*0Sstevel@tonic-gate * Note that addr is an unbiased value. 71*0Sstevel@tonic-gate */ 72*0Sstevel@tonic-gate #pragma weak stack_inbounds = _stack_inbounds 73*0Sstevel@tonic-gate int 74*0Sstevel@tonic-gate _stack_inbounds(void *addr) 75*0Sstevel@tonic-gate { 76*0Sstevel@tonic-gate stack_t *ustackp = &curthread->ul_ustack; 77*0Sstevel@tonic-gate uintptr_t base = (uintptr_t)ustackp->ss_sp; 78*0Sstevel@tonic-gate size_t size = ustackp->ss_size; 79*0Sstevel@tonic-gate 80*0Sstevel@tonic-gate return ((uintptr_t)addr >= base && (uintptr_t)addr < base + size); 81*0Sstevel@tonic-gate } 82*0Sstevel@tonic-gate 83*0Sstevel@tonic-gate #pragma weak stack_violation = _stack_violation 84*0Sstevel@tonic-gate int 85*0Sstevel@tonic-gate _stack_violation(int sig, const siginfo_t *sip, const ucontext_t *ucp) 86*0Sstevel@tonic-gate { 87*0Sstevel@tonic-gate uintptr_t addr; 88*0Sstevel@tonic-gate uintptr_t base; 89*0Sstevel@tonic-gate size_t size; 90*0Sstevel@tonic-gate 91*0Sstevel@tonic-gate if ((sig != SIGSEGV && sig != SIGBUS) || 92*0Sstevel@tonic-gate sip == NULL || ucp == NULL || SI_FROMUSER(sip)) 93*0Sstevel@tonic-gate return (0); 94*0Sstevel@tonic-gate 95*0Sstevel@tonic-gate /* 96*0Sstevel@tonic-gate * ucp has the correct view of the stack when the signal was raised. 97*0Sstevel@tonic-gate */ 98*0Sstevel@tonic-gate base = (uintptr_t)ucp->uc_stack.ss_sp; 99*0Sstevel@tonic-gate size = ucp->uc_stack.ss_size; 100*0Sstevel@tonic-gate #if defined(__sparc) 101*0Sstevel@tonic-gate addr = ucp->uc_mcontext.gregs[REG_SP] + STACK_BIAS; 102*0Sstevel@tonic-gate #elif defined(__amd64) || defined(__i386) 103*0Sstevel@tonic-gate addr = ucp->uc_mcontext.gregs[REG_SP]; 104*0Sstevel@tonic-gate /* 105*0Sstevel@tonic-gate * If the faulted address is just below the stack pointer we 106*0Sstevel@tonic-gate * might be looking at a push instruction that caused the fault 107*0Sstevel@tonic-gate * (the largest amount a push instruction can decrement the 108*0Sstevel@tonic-gate * stack pointer by is 32). In that case, use the faulted 109*0Sstevel@tonic-gate * address in our computation rather than the stack pointer. 110*0Sstevel@tonic-gate */ 111*0Sstevel@tonic-gate if (addr - (uintptr_t)sip->si_addr < 32) 112*0Sstevel@tonic-gate addr = (uintptr_t)sip->si_addr; 113*0Sstevel@tonic-gate #else 114*0Sstevel@tonic-gate #error "none of __sparc, __amd64, __i386 is defined" 115*0Sstevel@tonic-gate #endif 116*0Sstevel@tonic-gate return (!(addr >= base && addr < base + size)); 117*0Sstevel@tonic-gate } 118