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/* Copyright (C) 1997 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 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, 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 <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, -160, %sp
#ifdef PIC
1: rd %pc, %g1
sethi %hi(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7
or %l7, %lo(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7
add %l7, %g1, %l7
#endif
LOADSYSCALL(brk)
mov %i0, %o0
ta 0x11
/* All the ways we can fail... */
bcs,pn %xcc, .Lerr1
nop
brz %i0, .Lok
subcc %i0, %o0, %g0
bne,pn %xcc, .Lerr0
/* Update __curbrk and return cleanly. */
.Lok: sethi %hi(__curbrk), %g1
or %g1, %lo(__curbrk), %g1
#ifdef PIC
ldx [%l7+%g1], %g1
stx %o0, [%g1]
#else
stx %o0, [%g4+%g1]
#endif
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: sethi %hi(errno), %g1
or %g1, %lo(errno), %g1
#ifdef PIC
ldx [%l7+%g1], %g1
st %o0, [%g1]
#else
st %o0, [%g4+%g1]
#endif
#ifdef _LIBC_REENTRANT
call __errno_location
mov %o0,%l1
st %l1, [%o0]
#endif
sub %g0, 1, %i0
jmpl %i7+8, %g0
restore
.size __brk, .-__brk
weak_alias (__brk, brk)
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