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/*
* 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 <asm/assembler.h>
#include <asm/asm-offsets.h>
/*
* System call wrappers for the AArch32 compatibility layer.
*/
compat_sys_fork_wrapper:
mov x0, sp
b compat_sys_fork
ENDPROC(compat_sys_fork_wrapper)
compat_sys_vfork_wrapper:
mov x0, sp
b compat_sys_vfork
ENDPROC(compat_sys_vfork_wrapper)
compat_sys_execve_wrapper:
mov x3, sp
b compat_sys_execve
ENDPROC(compat_sys_execve_wrapper)
compat_sys_clone_wrapper:
mov x5, sp
b compat_sys_clone
ENDPROC(compat_sys_clone_wrapper)
compat_sys_sigreturn_wrapper:
mov x0, sp
mov x27, #0 // prevent syscall restart handling (why)
b compat_sys_sigreturn
ENDPROC(compat_sys_sigreturn_wrapper)
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)
compat_sys_sigaltstack_wrapper:
ldr x2, [sp, #S_COMPAT_SP]
b compat_do_sigaltstack
ENDPROC(compat_sys_sigaltstack_wrapper)
compat_sys_statfs64_wrapper:
mov w3, #84
cmp w1, #88
csel w1, w3, w1, eq
b compat_sys_statfs64
ENDPROC(compat_sys_statfs64_wrapper)
compat_sys_fstatfs64_wrapper:
mov w3, #84
cmp w1, #88
csel w1, w3, w1, eq
b compat_sys_fstatfs64
ENDPROC(compat_sys_fstatfs64_wrapper)
/*
* Wrappers for AArch32 syscalls that either take 64-bit parameters
* in registers or that take 32-bit parameters which require sign
* extension.
*/
compat_sys_lseek_wrapper:
sxtw x1, w1
b sys_lseek
ENDPROC(compat_sys_lseek_wrapper)
compat_sys_pread64_wrapper:
orr x3, x4, x5, lsl #32
b sys_pread64
ENDPROC(compat_sys_pread64_wrapper)
compat_sys_pwrite64_wrapper:
orr x3, x4, x5, lsl #32
b sys_pwrite64
ENDPROC(compat_sys_pwrite64_wrapper)
compat_sys_truncate64_wrapper:
orr x1, x2, x3, lsl #32
b sys_truncate
ENDPROC(compat_sys_truncate64_wrapper)
compat_sys_ftruncate64_wrapper:
orr x1, x2, x3, lsl #32
b sys_ftruncate
ENDPROC(compat_sys_ftruncate64_wrapper)
compat_sys_readahead_wrapper:
orr x1, x2, x3, lsl #32
mov w2, w4
b sys_readahead
ENDPROC(compat_sys_readahead_wrapper)
compat_sys_lookup_dcookie:
orr x0, x0, x1, lsl #32
mov w1, w2
mov w2, w3
b sys_lookup_dcookie
ENDPROC(compat_sys_lookup_dcookie)
compat_sys_fadvise64_64_wrapper:
mov w6, w1
orr x1, x2, x3, lsl #32
orr x2, x4, x5, lsl #32
mov w3, w6
b sys_fadvise64_64
ENDPROC(compat_sys_fadvise64_64_wrapper)
compat_sys_sync_file_range2_wrapper:
orr x2, x2, x3, lsl #32
orr x3, x4, x5, lsl #32
b sys_sync_file_range2
ENDPROC(compat_sys_sync_file_range2_wrapper)
compat_sys_fallocate_wrapper:
orr x2, x2, x3, lsl #32
orr x3, x4, x5, lsl #32
b sys_fallocate
ENDPROC(compat_sys_fallocate_wrapper)
compat_sys_fanotify_mark_wrapper:
orr x2, x2, x3, lsl #32
mov w3, w4
mov w4, w5
b sys_fanotify_mark
ENDPROC(compat_sys_fanotify_mark_wrapper)
#undef __SYSCALL
#define __SYSCALL(x, y) .quad y // x
#define __SYSCALL_COMPAT
/*
* The system calls table must be 4KB aligned.
*/
.align 12
ENTRY(compat_sys_call_table)
#include <asm/unistd.h>
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