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/* Copyright (C) 1997-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Richard Henderson <richard@gnu.ai.mit.edu>, 1997.
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 8
.globl __curbrk
__curbrk: .skip 8
.type __curbrk,@object
.size __curbrk,8
#else
.common __curbrk, 8, 8
#endif
.text
ENTRY (__brk)
save %sp, -192, %sp
cfi_def_cfa_register(%fp)
cfi_window_save
cfi_register(%o7, %i7)
#ifdef PIC
SETUP_PIC_REG(l7)
#endif
LOADSYSCALL(brk)
mov %i0, %o0
ta 0x6d
/* All the ways we can fail... */
bcs,pn %xcc, .Lerr1
nop
brz,pt %i0, .Lok
subcc %i0, %o0, %g0
bne,pn %xcc, .Lerr0
nop
/* Update __curbrk and return cleanly. */
.Lok:
#ifndef PIC
sethi %hi(__curbrk), %g1
or %g1, %lo(__curbrk), %g1
#else
sethi %gdop_hix22(__curbrk), %g1
xor %g1, %gdop_lox10(__curbrk), %g1
ldx [%l7 + %g1], %g1, %gdop(__curbrk)
#endif
stx %o0, [%g1]
mov %g0, %i0
/* Don't use "ret" cause the preprocessor will eat it. */
jmpl %i7+8, %g0
restore
/* What a horrible way to die. */
.Lerr0: set ENOMEM, %o0
.Lerr1:
#ifndef _LIBC_REENTRANT
#ifndef PIC
sethi %hi(errno), %g1
or %g1, %lo(errno), %g1
#else
sethi %gdop_hix22(errno), %g1
xor %g1, %gdop_lox10(errno), %g1
ldx [%l7 + %g1], %g1, %gdop(errno)
#endif
st %o0, [%g1]
#else
#if IS_IN (libc)
call HIDDEN_JUMPTARGET(__errno_location)
#else
call __errno_location
#endif
mov %o0,%l1
st %l1, [%o0]
#endif
sub %g0, 1, %i0
jmpl %i7+8, %g0
restore
END (__brk)
weak_alias (__brk, brk)
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