/* Copyright (C) 1993-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Brendan Kehoe <brendan@zen.org>, 1993.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library.  If not, see

   <http://www.gnu.org/licenses/>.  */

/* __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 <bits/errno.h>

#ifdef PIC

.section .bss

	.align 3

	.globl __curbrk

__curbrk: .skip 8

	.type __curbrk,@object

	.size __curbrk,8

#else

.comm __curbrk, 8

#endif

	.text

	.align	4

	.globl	__brk

	.ent	__brk

	.usepv	__brk, std

	cfi_startproc

__brk:

	ldgp	gp, 0(t12)

	subq	sp, 16, sp

	cfi_adjust_cfa_offset (16)

#ifdef PROF

	.set noat

	lda	AT, _mcount

	jsr	AT, (AT), _mcount

	.set at

#endif

	/* Save the requested brk across the system call.  */

	stq	a0, 0(sp)

	ldiq	v0, __NR_brk

	call_pal PAL_callsys

	ldq	a0, 0(sp)

	addq	sp, 16, sp

	cfi_adjust_cfa_offset (-16)

	/* Be prepared for an OSF-style brk.  */

	bne	a3, SYSCALL_ERROR_LABEL

	beq	v0, $ok

	/* Correctly handle the brk(0) query case.  */

	cmoveq	a0, v0, a0

	xor	a0, v0, t0

	lda	v0, ENOMEM

	bne	t0, SYSCALL_ERROR_LABEL

	/* Update __curbrk and return cleanly.  */

	lda	v0, 0

$ok:	stq	a0, __curbrk

	ret

PSEUDO_END(__brk)

	cfi_endproc

weak_alias (__brk, brk)