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 (c) 1987 Sun Microsystems, Inc. 24*0Sstevel@tonic-gate */ 25*0Sstevel@tonic-gate 26*0Sstevel@tonic-gate#ident "%Z%%M% %I% %E% SMI" 27*0Sstevel@tonic-gate 28*0Sstevel@tonic-gate .file "alloca.s" 29*0Sstevel@tonic-gate 30*0Sstevel@tonic-gate#include <sys/asm_linkage.h> 31*0Sstevel@tonic-gate 32*0Sstevel@tonic-gate ! 33*0Sstevel@tonic-gate ! o0: # bytes of space to allocate, already rounded to 0 mod 8 34*0Sstevel@tonic-gate ! o1: %sp-relative offset of tmp area 35*0Sstevel@tonic-gate ! o2: %sp-relative offset of end of tmp area 36*0Sstevel@tonic-gate ! 37*0Sstevel@tonic-gate ! we want to bump %sp by the requested size 38*0Sstevel@tonic-gate ! then copy the tmp area to its new home 39*0Sstevel@tonic-gate ! this is necessasy as we could theoretically 40*0Sstevel@tonic-gate ! be in the middle of a compilicated expression. 41*0Sstevel@tonic-gate ! 42*0Sstevel@tonic-gate ENTRY(__builtin_alloca) 43*0Sstevel@tonic-gate mov %sp, %o3 ! save current sp 44*0Sstevel@tonic-gate sub %sp, %o0, %sp ! bump to new value 45*0Sstevel@tonic-gate ! copy loop: should do nothing gracefully 46*0Sstevel@tonic-gate b 2f 47*0Sstevel@tonic-gate subcc %o2, %o1, %o5 ! number of bytes to move 48*0Sstevel@tonic-gate1: 49*0Sstevel@tonic-gate ld [%o3 + %o1], %o4 ! load from old temp area 50*0Sstevel@tonic-gate st %o4, [%sp + %o1] ! store to new temp area 51*0Sstevel@tonic-gate add %o1, 4, %o1 52*0Sstevel@tonic-gate2: bg 1b 53*0Sstevel@tonic-gate subcc %o5, 4, %o5 54*0Sstevel@tonic-gate ! now return new %sp + end-of-temp 55*0Sstevel@tonic-gate retl 56*0Sstevel@tonic-gate add %sp, %o2, %o0 57*0Sstevel@tonic-gate 58*0Sstevel@tonic-gate SET_SIZE(__builtin_alloca) 59