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/* Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc.
Contributed by Brendan Kehoe (brendan@zen.org).
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
/* __brk is a special syscall under Linux since it never returns an
error. Instead, the error condition is indicated by returning the old
break value (instead of the new, requested one). */
#include <sysdep.h>
#define _ERRNO_H
#include <errnos.h>
#ifdef PIC
.section .bss
.align 3
.globl __curbrk
__curbrk: .skip 8
.type __curbrk,@object
.size __curbrk,8
#else
.comm __curbrk, 8
#endif
.text
LEAF(__brk, 0)
ldgp gp, 0(t12)
.prologue 1
ldiq v0, __NR_brk
call_pal PAL_callsys
/* Correctly handle the brk(0) query case. */
cmoveq a0, v0, a0
subq a0, v0, t0
bne t0, error
/* Update __curbrk and return cleanly. */
stq a0, __curbrk
mov zero, v0
ret
/* What a horrible way to die. */
error: ldi v0, ENOMEM
jmp zero, __syscall_error
END(__brk)
weak_alias (__brk, brk)
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