| /* |
| * 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) |