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| -rw-r--r-- | lib/libc/arch/sparc64/sys/brk.S | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/lib/libc/arch/sparc64/sys/brk.S b/lib/libc/arch/sparc64/sys/brk.S new file mode 100644 index 00000000000..fb1bc85d768 --- /dev/null +++ b/lib/libc/arch/sparc64/sys/brk.S @@ -0,0 +1,91 @@ +/* $OpenBSD: brk.S,v 1.1 2001/08/28 22:25:59 art Exp $ */ +/* $NetBSD: brk.S,v 1.9 2000/07/25 20:15:40 mycroft Exp $ */ + +/* + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * This software was developed by the Computer Systems Engineering group + * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and + * contributed to Berkeley. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <machine/asm.h> + +#include "SYS.h" + + .globl _C_LABEL(__curbrk) + .globl _C_LABEL(__minbrk) + .globl _C_LABEL(_end) + +#ifdef WEAK_ALIAS +WEAK_ALIAS(brk, _brk) +#endif + + .data + .align 8 +_C_LABEL(__minbrk): + .xword _C_LABEL(_end) /* lower brk limit; also for gmon code */ + .text + +ENTRY(_brk) +#ifdef PIC + PIC_PROLOGUE(%o5,%o4) + set _C_LABEL(__minbrk), %o4 + ldx [%o5 + %o4], %o4 + ldx [%o4], %o1 /* %o1 = minbrk */ + cmp %o1, %o0 /* if (minbrk > %o0) */ + movg %xcc, %o1, %o0 /* %o0 = minbrk */ + mov %o0, %o2 /* save argument to syscall */ + mov SYS_break, %g1 + t ST_SYSCALL + set _C_LABEL(__curbrk), %o3 + bcc,a,pt %icc, 1f + ldx [%o5 + %o3], %o4 + ERROR() +1: + retl /* success, return 0 & record new break */ + stx %o2, [%o4] +#else + sethi %hi(_C_LABEL(__minbrk)), %o1 /* %o1 = minbrk */ + ldx [%o1 + %lo(_C_LABEL(__minbrk))], %o1 + cmp %o1, %o0 /* if (minbrk > %o0) */ + movg %xcc, %o1, %o0 /* %o0 = minbrk */ + mov %o0, %o2 /* save argument to syscall */ + mov SYS_break, %g1 + t ST_SYSCALL + bcc,a,pt %icc,1f + sethi %hi(_C_LABEL(__curbrk)), %g1 + ERROR() +1: + retl /* success, return 0 & record new break */ + stx %o2, [%g1 + %lo(_C_LABEL(__curbrk))] +#endif |