mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-19 03:20:05 +00:00
beef95268f
2000-02-20 Philip Blundell <philb@gnu.org> * sysdeps/unix/sysv/linux/arm/mmap64.S: Fix off by one error.
68 lines
2.0 KiB
ArmAsm
68 lines
2.0 KiB
ArmAsm
/* Copyright (C) 2000 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
#define EINVAL 22
|
|
#define ENOSYS 38
|
|
|
|
/* The mmap2 system call takes six arguments, all in registers. */
|
|
.text
|
|
ENTRY (__mmap64)
|
|
#ifdef __NR_mmap2
|
|
stmfd sp!, {r4, r5, lr}
|
|
ldr r5, [sp, $16]
|
|
ldr r4, [sp, $12]
|
|
movs ip, r5, lsl $20 @ check that offset is page-aligned
|
|
bne .Linval
|
|
ldr ip, [sp, $20]
|
|
mov r5, r5, lsr $12
|
|
orr r5, r5, ip, lsl $20 @ compose page offset
|
|
movs ip, ip, lsr $12
|
|
bne .Linval @ check for overflow
|
|
mov ip, r0
|
|
swi SYS_ify (mmap2)
|
|
cmn r0, $4096
|
|
LOADREGS(ccfd, sp!, {r4, r5, pc})
|
|
cmn r0, $ENOSYS
|
|
ldmnefd sp!, {r4, r5, lr}
|
|
bne PLTJMP(syscall_error)
|
|
/* The current kernel does not support mmap2. Fall back to plain
|
|
mmap if the offset is small enough. */
|
|
ldr r5, [sp, $20]
|
|
mov r0, ip @ first arg was clobbered
|
|
teq r5, $0
|
|
ldmeqfd sp!, {r4, r5, lr}
|
|
beq PLTJMP(__mmap)
|
|
.Linval:
|
|
mov r0, $-EINVAL
|
|
ldmfd sp!, {r4, r5, lr}
|
|
b PLTJMP(syscall_error)
|
|
#else
|
|
/* The kernel headers do not support mmap2. Fall back to plain
|
|
mmap if the offset is small enough. */
|
|
ldr ip, [sp, $8]
|
|
teq ip, $0
|
|
beq PLTJMP(__mmap)
|
|
mov r0, $-EINVAL
|
|
b PLTJMP(syscall_error)
|
|
#endif
|
|
PSEUDO_END (__mmap64)
|
|
|
|
weak_alias (__mmap64, mmap64)
|