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 56812Sraf * Common Development and Distribution License (the "License"). 66812Sraf * 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 */ 216812Sraf 220Sstevel@tonic-gate/* 236812Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 240Sstevel@tonic-gate * Use is subject to license terms. 250Sstevel@tonic-gate */ 260Sstevel@tonic-gate 27*7298SMark.J.Nelson@Sun.COM .file "_stack_grow.s" 280Sstevel@tonic-gate 290Sstevel@tonic-gate#include "SYS.h" 300Sstevel@tonic-gate#include <../assym.h> 310Sstevel@tonic-gate 320Sstevel@tonic-gate/* 330Sstevel@tonic-gate * void * 340Sstevel@tonic-gate * _stack_grow(void *addr) 350Sstevel@tonic-gate * { 360Sstevel@tonic-gate * uintptr_t base = (uintptr_t)curthread->ul_ustack.ss_sp; 370Sstevel@tonic-gate * size_t size = curthread->ul_ustack.ss_size; 380Sstevel@tonic-gate * 390Sstevel@tonic-gate * if (size > (uintptr_t)addr - (base - STACK_BIAS)) 400Sstevel@tonic-gate * return (addr); 410Sstevel@tonic-gate * 420Sstevel@tonic-gate * if (size == 0) 430Sstevel@tonic-gate * return (addr); 440Sstevel@tonic-gate * 450Sstevel@tonic-gate * if (size > %sp - (base - STACK_BIAS)) 460Sstevel@tonic-gate * %sp = base - STACK_BIAS - STACK_ALIGN; 470Sstevel@tonic-gate * 480Sstevel@tonic-gate * *((char *)(base - 1)); 490Sstevel@tonic-gate * 500Sstevel@tonic-gate * _lwp_kill(_lwp_self(), SIGSEGV); 510Sstevel@tonic-gate * } 520Sstevel@tonic-gate */ 530Sstevel@tonic-gate 540Sstevel@tonic-gate#if defined(__sparcv9) 550Sstevel@tonic-gate#define PN ,pn %xcc, 560Sstevel@tonic-gate#else 570Sstevel@tonic-gate#define PN 580Sstevel@tonic-gate#endif 590Sstevel@tonic-gate 600Sstevel@tonic-gate /* 610Sstevel@tonic-gate * o0: address to which the stack will be grown (biased) 620Sstevel@tonic-gate */ 630Sstevel@tonic-gate ENTRY(_stack_grow) 640Sstevel@tonic-gate ldn [%g7 + UL_USTACK + SS_SP], %o1 650Sstevel@tonic-gate ldn [%g7 + UL_USTACK + SS_SIZE], %o2 660Sstevel@tonic-gate sub %o1, STACK_BIAS, %o3 670Sstevel@tonic-gate 680Sstevel@tonic-gate sub %o0, %o3, %o4 690Sstevel@tonic-gate cmp %o2, %o4 700Sstevel@tonic-gate bleu PN 1f 710Sstevel@tonic-gate tst %o2 720Sstevel@tonic-gate 730Sstevel@tonic-gate retl 740Sstevel@tonic-gate nop 750Sstevel@tonic-gate1: 760Sstevel@tonic-gate /* 770Sstevel@tonic-gate * If the stack size is 0, stack checking is disabled. 780Sstevel@tonic-gate */ 790Sstevel@tonic-gate bnz PN 2f 800Sstevel@tonic-gate nop 810Sstevel@tonic-gate retl 820Sstevel@tonic-gate nop 830Sstevel@tonic-gate2: 840Sstevel@tonic-gate /* 850Sstevel@tonic-gate * Move the stack pointer outside the stack bounds if it isn't already. 860Sstevel@tonic-gate */ 870Sstevel@tonic-gate sub %sp, %o3, %o4 880Sstevel@tonic-gate cmp %o2, %o4 890Sstevel@tonic-gate bleu PN 3f 900Sstevel@tonic-gate nop 910Sstevel@tonic-gate sub %o3, STACK_ALIGN, %sp 920Sstevel@tonic-gate3: 930Sstevel@tonic-gate /* 940Sstevel@tonic-gate * Dereference an address in the guard page. 950Sstevel@tonic-gate */ 960Sstevel@tonic-gate ldub [%o1 - 1], %g0 970Sstevel@tonic-gate 980Sstevel@tonic-gate /* 990Sstevel@tonic-gate * If the above load doesn't raise a SIGSEGV then do it ourselves. 1000Sstevel@tonic-gate */ 1010Sstevel@tonic-gate SYSTRAP_RVAL1(lwp_self) 1020Sstevel@tonic-gate mov SIGSEGV, %o1 1030Sstevel@tonic-gate SYSTRAP_RVAL1(lwp_kill) 1040Sstevel@tonic-gate 1050Sstevel@tonic-gate /* 1060Sstevel@tonic-gate * We should never get here; explode if we do. 1070Sstevel@tonic-gate */ 1080Sstevel@tonic-gate illtrap 1090Sstevel@tonic-gate SET_SIZE(_stack_grow) 110