Mercurial > illumos > illumos-gate
view usr/src/lib/libc/amd64/gen/_stack_grow.s @ 7298:b69e27387f74
6733918 Teamware has retired, please welcome your new manager, Mercurial
4758439 some files use "current date" sccs keywords
6560843 asm sources should not rely on .file "%M%" for naming STT_FILE symbols
6560958 Solaris:: perl modules should not use SCCS keywords in version information
6729074 webrev doesn't deal well with remote ssh hg parents
author | Mark J. Nelson <Mark.J.Nelson@Sun.COM> |
---|---|
date | Wed, 06 Aug 2008 16:29:39 -0600 |
parents | 68f95e015346 |
children |
line wrap: on
line source
/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (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. */ .file "_stack_grow.s" /* * void * * _stack_grow(void *addr) * { * uintptr_t base = (uintptr_t)curthread->ul_ustack.ss_sp; * size_t size = curthread->ul_ustack.ss_size; * * if (size > (uintptr_t)addr - base) * return (addr); * * if (size == 0) * return (addr); * * if (size > %sp - base) * %sp = base - STACK_ALIGN; * * *((char *)(base - 1)); * * _lwp_kill(_lwp_self(), SIGSEGV); * } */ #include "SYS.h" #include <../assym.h> ENTRY(_stack_grow) movq %rdi, %rax movq %fs:UL_USTACK+SS_SP, %rcx movq %fs:UL_USTACK+SS_SIZE, %rdx movq %rax, %rbx subq %rcx, %rbx cmpq %rdx, %rbx jae 1f ret 1: / / If the stack size is 0, stack checking is disabled. / cmpq $0, %rdx jne 2f ret 2: / / Move the stack pointer outside the stack bounds if it isn't already. / movq %rsp, %rbx subq %rcx, %rbx cmpq %rdx, %rbx jae 3f pushq %rbp movq %rsp, %rbp movq %rcx, %rsp subq $STACK_ALIGN, %rsp 3: / / Dereference an address in the guard page. / movb -1(%rcx), %bl / / If the above load doesn't raise a SIGSEGV then do it ourselves. / SYSTRAP_RVAL1(lwp_self) movl $SIGSEGV, %esi movl %eax, %edi SYSTRAP_RVAL1(lwp_kill) / / Try one last time to take out the process. / movq 0x0, %rax SET_SIZE(_stack_grow)