diff options
Diffstat (limited to 'arch/arm64/kernel/sys32.S')
| -rw-r--r-- | arch/arm64/kernel/sys32.S | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/arch/arm64/kernel/sys32.S b/arch/arm64/kernel/sys32.S new file mode 100644 index 00000000000..423a5b3fc2b --- /dev/null +++ b/arch/arm64/kernel/sys32.S @@ -0,0 +1,115 @@ +/* + * 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_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_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_pread64_wrapper: + regs_to_64 x3, x4, x5 + b sys_pread64 +ENDPROC(compat_sys_pread64_wrapper) + +compat_sys_pwrite64_wrapper: + regs_to_64 x3, x4, x5 + b sys_pwrite64 +ENDPROC(compat_sys_pwrite64_wrapper) + +compat_sys_truncate64_wrapper: + regs_to_64 x1, x2, x3 + b sys_truncate +ENDPROC(compat_sys_truncate64_wrapper) + +compat_sys_ftruncate64_wrapper: + regs_to_64 x1, x2, x3 + b sys_ftruncate +ENDPROC(compat_sys_ftruncate64_wrapper) + +compat_sys_readahead_wrapper: + regs_to_64 x1, x2, x3 + mov w2, w4 + b sys_readahead +ENDPROC(compat_sys_readahead_wrapper) + +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) + +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) + +compat_sys_fallocate_wrapper: + regs_to_64 x2, x2, x3 + regs_to_64 x3, x4, x5 + b sys_fallocate +ENDPROC(compat_sys_fallocate_wrapper) + +#undef __SYSCALL +#define __SYSCALL(x, y) .quad y // x + +/* + * The system calls table must be 4KB aligned. + */ + .align 12 +ENTRY(compat_sys_call_table) +#include <asm/unistd32.h> |