mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-02 17:50:20 +00:00
63 lines
1.6 KiB
ArmAsm
63 lines
1.6 KiB
ArmAsm
/* 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>
|
|
#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)
|