linux/arch/arm64/kernel/entry32.S
Andreas Schwab 18ccb0cab4 arm64: fix implementation of mmap2 compat syscall
The arm mmap2 syscall takes the offset in units of 4K, thus with 64K pages
the offset needs to be scaled to units of pages.

Signed-off-by: Andreas Schwab <schwab@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
[will: removed redundant lr parameter, localised PAGE_SHIFT #if check]
Signed-off-by: Will Deacon <will.deacon@arm.com>
2015-03-19 10:43:51 +00:00

124 lines
3.1 KiB
ArmAsm

/*
* Compat system call wrappers
*
* Copyright (C) 2012 ARM Ltd.
* Authors: Will Deacon <will.deacon@arm.com>
* Catalin Marinas <catalin.marinas@arm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/linkage.h>
#include <linux/const.h>
#include <asm/assembler.h>
#include <asm/asm-offsets.h>
#include <asm/errno.h>
#include <asm/page.h>
/*
* System call wrappers for the AArch32 compatibility layer.
*/
ENTRY(compat_sys_sigreturn_wrapper)
mov x0, sp
mov x27, #0 // prevent syscall restart handling (why)
b compat_sys_sigreturn
ENDPROC(compat_sys_sigreturn_wrapper)
ENTRY(compat_sys_rt_sigreturn_wrapper)
mov x0, sp
mov x27, #0 // prevent syscall restart handling (why)
b compat_sys_rt_sigreturn
ENDPROC(compat_sys_rt_sigreturn_wrapper)
ENTRY(compat_sys_statfs64_wrapper)
mov w3, #84
cmp w1, #88
csel w1, w3, w1, eq
b compat_sys_statfs64
ENDPROC(compat_sys_statfs64_wrapper)
ENTRY(compat_sys_fstatfs64_wrapper)
mov w3, #84
cmp w1, #88
csel w1, w3, w1, eq
b compat_sys_fstatfs64
ENDPROC(compat_sys_fstatfs64_wrapper)
/*
* Note: off_4k (w5) is always in units of 4K. If we can't do the
* requested offset because it is not page-aligned, we return -EINVAL.
*/
ENTRY(compat_sys_mmap2_wrapper)
#if PAGE_SHIFT > 12
tst w5, #~PAGE_MASK >> 12
b.ne 1f
lsr w5, w5, #PAGE_SHIFT - 12
#endif
b sys_mmap_pgoff
1: mov x0, #-EINVAL
ret
ENDPROC(compat_sys_mmap2_wrapper)
/*
* Wrappers for AArch32 syscalls that either take 64-bit parameters
* in registers or that take 32-bit parameters which require sign
* extension.
*/
ENTRY(compat_sys_pread64_wrapper)
regs_to_64 x3, x4, x5
b sys_pread64
ENDPROC(compat_sys_pread64_wrapper)
ENTRY(compat_sys_pwrite64_wrapper)
regs_to_64 x3, x4, x5
b sys_pwrite64
ENDPROC(compat_sys_pwrite64_wrapper)
ENTRY(compat_sys_truncate64_wrapper)
regs_to_64 x1, x2, x3
b sys_truncate
ENDPROC(compat_sys_truncate64_wrapper)
ENTRY(compat_sys_ftruncate64_wrapper)
regs_to_64 x1, x2, x3
b sys_ftruncate
ENDPROC(compat_sys_ftruncate64_wrapper)
ENTRY(compat_sys_readahead_wrapper)
regs_to_64 x1, x2, x3
mov w2, w4
b sys_readahead
ENDPROC(compat_sys_readahead_wrapper)
ENTRY(compat_sys_fadvise64_64_wrapper)
mov w6, w1
regs_to_64 x1, x2, x3
regs_to_64 x2, x4, x5
mov w3, w6
b sys_fadvise64_64
ENDPROC(compat_sys_fadvise64_64_wrapper)
ENTRY(compat_sys_sync_file_range2_wrapper)
regs_to_64 x2, x2, x3
regs_to_64 x3, x4, x5
b sys_sync_file_range2
ENDPROC(compat_sys_sync_file_range2_wrapper)
ENTRY(compat_sys_fallocate_wrapper)
regs_to_64 x2, x2, x3
regs_to_64 x3, x4, x5
b sys_fallocate
ENDPROC(compat_sys_fallocate_wrapper)