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view usr/src/lib/libc/sparcv9/gen/alloca.s @ 7298:b69e27387f74
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author | Mark J. Nelson <Mark.J.Nelson@Sun.COM> |
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date | Wed, 06 Aug 2008 16:29:39 -0600 |
parents | 68f95e015346 |
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/* * 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 (c) 1998, by Sun Microsystems, Inc. * All rights reserved. */ .file "alloca.s" #include <sys/asm_linkage.h> #include <sys/stack.h> ! ! o0: # bytes of space to allocate, already rounded to 0 mod 8 ! o1: %sp-relative offset of tmp area ! o2: %sp-relative offset of end of tmp area ! ! we want to bump %sp by the requested size ! then copy the tmp area to its new home ! this is necessary as we could theoretically ! be in the middle of a complicated expression. ! ENTRY(__builtin_alloca) add %sp, STACK_BIAS, %g1 ! save current sp + STACK_BIAS sub %sp, %o0, %sp ! bump to new value add %sp, STACK_BIAS, %g5 ! copy loop: should do nothing gracefully b 2f subcc %o2, %o1, %o5 ! number of bytes to move 1: ldx [%g1 + %o1], %o4 ! load from old temp area stx %o4, [%g5 + %o1] ! store to new temp area add %o1, 8, %o1 2: bg,pt %xcc, 1b subcc %o5, 8, %o5 ! now return new %sp + end-of-temp add %sp, %o2, %o0 retl add %o0, STACK_BIAS, %o0 SET_SIZE(__builtin_alloca)