LXR linux/arch/arm64/kernel/sys32.S

   1/*
   2 * Compat system call wrappers
   3 *
   4 * Copyright (C) 2012 ARM Ltd.
   5 * Authors: Will Deacon <will.deacon@arm.com>
   6 *          Catalin Marinas <catalin.marinas@arm.com>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21#include <linux/linkage.h>
  22
  23#include <asm/assembler.h>
  24#include <asm/asm-offsets.h>
  25
  26/*
  27 * System call wrappers for the AArch32 compatibility layer.
  28 */
  29
  30compat_sys_sigreturn_wrapper:
  31        mov     x0, sp
  32        mov     x27, #0         // prevent syscall restart handling (why)
  33        b       compat_sys_sigreturn
  34ENDPROC(compat_sys_sigreturn_wrapper)
  35
  36compat_sys_rt_sigreturn_wrapper:
  37        mov     x0, sp
  38        mov     x27, #0         // prevent syscall restart handling (why)
  39        b       compat_sys_rt_sigreturn
  40ENDPROC(compat_sys_rt_sigreturn_wrapper)
  41
  42compat_sys_statfs64_wrapper:
  43        mov     w3, #84
  44        cmp     w1, #88
  45        csel    w1, w3, w1, eq
  46        b       compat_sys_statfs64
  47ENDPROC(compat_sys_statfs64_wrapper)
  48
  49compat_sys_fstatfs64_wrapper:
  50        mov     w3, #84
  51        cmp     w1, #88
  52        csel    w1, w3, w1, eq
  53        b       compat_sys_fstatfs64
  54ENDPROC(compat_sys_fstatfs64_wrapper)
  55
  56/*
  57 * Wrappers for AArch32 syscalls that either take 64-bit parameters
  58 * in registers or that take 32-bit parameters which require sign
  59 * extension.
  60 */
  61compat_sys_pread64_wrapper:
  62        orr     x3, x4, x5, lsl #32
  63        b       sys_pread64
  64ENDPROC(compat_sys_pread64_wrapper)
  65
  66compat_sys_pwrite64_wrapper:
  67        orr     x3, x4, x5, lsl #32
  68        b       sys_pwrite64
  69ENDPROC(compat_sys_pwrite64_wrapper)
  70
  71compat_sys_truncate64_wrapper:
  72        orr     x1, x2, x3, lsl #32
  73        b       sys_truncate
  74ENDPROC(compat_sys_truncate64_wrapper)
  75
  76compat_sys_ftruncate64_wrapper:
  77        orr     x1, x2, x3, lsl #32
  78        b       sys_ftruncate
  79ENDPROC(compat_sys_ftruncate64_wrapper)
  80
  81compat_sys_readahead_wrapper:
  82        orr     x1, x2, x3, lsl #32
  83        mov     w2, w4
  84        b       sys_readahead
  85ENDPROC(compat_sys_readahead_wrapper)
  86
  87compat_sys_fadvise64_64_wrapper:
  88        mov     w6, w1
  89        orr     x1, x2, x3, lsl #32
  90        orr     x2, x4, x5, lsl #32
  91        mov     w3, w6
  92        b       sys_fadvise64_64
  93ENDPROC(compat_sys_fadvise64_64_wrapper)
  94
  95compat_sys_sync_file_range2_wrapper:
  96        orr     x2, x2, x3, lsl #32
  97        orr     x3, x4, x5, lsl #32
  98        b       sys_sync_file_range2
  99ENDPROC(compat_sys_sync_file_range2_wrapper)
 100
 101compat_sys_fallocate_wrapper:
 102        orr     x2, x2, x3, lsl #32
 103        orr     x3, x4, x5, lsl #32
 104        b       sys_fallocate
 105ENDPROC(compat_sys_fallocate_wrapper)
 106
 107#undef __SYSCALL
 108#define __SYSCALL(x, y)         .quad   y       // x
 109
 110/*
 111 * The system calls table must be 4KB aligned.
 112 */
 113        .align  12
 114ENTRY(compat_sys_call_table)
 115#include <asm/unistd32.h>
 116