1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 .file "_stack_grow.s" 27 28/* 29 * void * 30 * _stack_grow(void *addr) 31 * { 32 * uintptr_t base = (uintptr_t)curthread->ul_ustack.ss_sp; 33 * size_t size = curthread->ul_ustack.ss_size; 34 * 35 * if (size > (uintptr_t)addr - base) 36 * return (addr); 37 * 38 * if (size == 0) 39 * return (addr); 40 * 41 * if (size > %sp - base) 42 * %sp = base - STACK_ALIGN; 43 * 44 * *((char *)(base - 1)); 45 * 46 * _lwp_kill(_lwp_self(), SIGSEGV); 47 * } 48 */ 49 50#include "SYS.h" 51#include <assym.h> 52 53 ENTRY(_stack_grow) 54 movl 4(%esp), %eax 55 movl %gs:UL_USTACK+SS_SP, %ecx 56 movl %gs:UL_USTACK+SS_SIZE, %edx 57 movl %eax, %ebx 58 subl %ecx, %ebx 59 cmpl %edx, %ebx 60 jae 1f 61 ret 621: 63 / 64 / If the stack size is 0, stack checking is disabled. 65 / 66 cmpl $0, %edx 67 jne 2f 68 ret 692: 70 / 71 / Move the stack pointer outside the stack bounds if it isn't already. 72 / 73 movl %esp, %ebx 74 subl %ecx, %ebx 75 cmpl %edx, %ebx 76 jae 3f 77 pushl %ebp 78 movl %esp, %ebp 79 movl %ecx, %esp 80 subl $STACK_ALIGN, %esp 813: 82 / 83 / Dereference an address in the guard page. 84 / 85 movb -1(%ecx), %bl 86 87 / 88 / If the above load doesn't raise a SIGSEGV then do it ourselves. 89 / 90 SYSTRAP_RVAL1(lwp_self) 91 pushl $SIGSEGV 92 pushl %eax 93 pushl $0 94 SYSTRAP_RVAL1(lwp_kill) 95 addl $12, %esp 96 97 / 98 / Try one last time to take out the process. 99 / 100 movl 0x0, %eax 101 SET_SIZE(_stack_grow) 102