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 compat_sys_fork_wrapper:
  30         mov     x0, sp
  31         b       compat_sys_fork
  32 ENDPROC(compat_sys_fork_wrapper)
  33
  34 compat_sys_vfork_wrapper:
  35         mov     x0, sp
  36         b       compat_sys_vfork
  37 ENDPROC(compat_sys_vfork_wrapper)
  38
  39 compat_sys_execve_wrapper:
  40         mov     x3, sp
  41         b       compat_sys_execve
  42 ENDPROC(compat_sys_execve_wrapper)
  43
  44 compat_sys_clone_wrapper:
  45         mov     x5, sp
  46         b       compat_sys_clone
  47 ENDPROC(compat_sys_clone_wrapper)
  48
  49 compat_sys_sigreturn_wrapper:
  50         mov     x0, sp
  51         mov     x27, #0         // prevent syscall restart handling (why)
  52         b       compat_sys_sigreturn
  53 ENDPROC(compat_sys_sigreturn_wrapper)
  54
  55 compat_sys_rt_sigreturn_wrapper:
  56         mov     x0, sp
  57         mov     x27, #0         // prevent syscall restart handling (why)
  58         b       compat_sys_rt_sigreturn
  59 ENDPROC(compat_sys_rt_sigreturn_wrapper)
  60
  61 compat_sys_sigaltstack_wrapper:
  62         ldr     x2, [sp, #S_COMPAT_SP]
  63         b       compat_do_sigaltstack
  64 ENDPROC(compat_sys_sigaltstack_wrapper)
  65
  66 compat_sys_statfs64_wrapper:
  67         mov     w3, #84
  68         cmp     w1, #88
  69         csel    w1, w3, w1, eq
  70         b       compat_sys_statfs64
  71 ENDPROC(compat_sys_statfs64_wrapper)
  72
  73 compat_sys_fstatfs64_wrapper:
  74         mov     w3, #84
  75         cmp     w1, #88
  76         csel    w1, w3, w1, eq
  77         b       compat_sys_fstatfs64
  78 ENDPROC(compat_sys_fstatfs64_wrapper)
  79
  80 /*
  81  * Wrappers for AArch32 syscalls that either take 64-bit parameters
  82  * in registers or that take 32-bit parameters which require sign
  83  * extension.
  84  */
  85 compat_sys_lseek_wrapper:
  86         sxtw    x1, w1
  87         b       sys_lseek
  88 ENDPROC(compat_sys_lseek_wrapper)
  89
  90 compat_sys_pread64_wrapper:
  91         orr     x3, x4, x5, lsl #32
  92         b       sys_pread64
  93 ENDPROC(compat_sys_pread64_wrapper)
  94
  95 compat_sys_pwrite64_wrapper:
  96         orr     x3, x4, x5, lsl #32
  97         b       sys_pwrite64
  98 ENDPROC(compat_sys_pwrite64_wrapper)
  99
 100 compat_sys_truncate64_wrapper:
 101         orr     x1, x2, x3, lsl #32
 102         b       sys_truncate
 103 ENDPROC(compat_sys_truncate64_wrapper)
 104
 105 compat_sys_ftruncate64_wrapper:
 106         orr     x1, x2, x3, lsl #32
 107         b       sys_ftruncate
 108 ENDPROC(compat_sys_ftruncate64_wrapper)
 109
 110 compat_sys_readahead_wrapper:
 111         orr     x1, x2, x3, lsl #32
 112         mov     w2, w4
 113         b       sys_readahead
 114 ENDPROC(compat_sys_readahead_wrapper)
 115
 116 compat_sys_lookup_dcookie:
 117         orr     x0, x0, x1, lsl #32
 118         mov     w1, w2
 119         mov     w2, w3
 120         b       sys_lookup_dcookie
 121 ENDPROC(compat_sys_lookup_dcookie)
 122
 123 compat_sys_fadvise64_64_wrapper:
 124         mov     w6, w1
 125         orr     x1, x2, x3, lsl #32
 126         orr     x2, x4, x5, lsl #32
 127         mov     w3, w6
 128         b       sys_fadvise64_64
 129 ENDPROC(compat_sys_fadvise64_64_wrapper)
 130
 131 compat_sys_sync_file_range2_wrapper:
 132         orr     x2, x2, x3, lsl #32
 133         orr     x3, x4, x5, lsl #32
 134         b       sys_sync_file_range2
 135 ENDPROC(compat_sys_sync_file_range2_wrapper)
 136
 137 compat_sys_fallocate_wrapper:
 138         orr     x2, x2, x3, lsl #32
 139         orr     x3, x4, x5, lsl #32
 140         b       sys_fallocate
 141 ENDPROC(compat_sys_fallocate_wrapper)
 142
 143 compat_sys_fanotify_mark_wrapper:
 144         orr     x2, x2, x3, lsl #32
 145         mov     w3, w4
 146         mov     w4, w5
 147         b       sys_fanotify_mark
 148 ENDPROC(compat_sys_fanotify_mark_wrapper)
 149
 150 #undef __SYSCALL
 151 #define __SYSCALL(x, y)         .quad   y       // x
 152 #define __SYSCALL_COMPAT
 153
 154 /*
 155  * The system calls table must be 4KB aligned.
 156  */
 157         .align  12
 158 ENTRY(compat_sys_call_table)
 159 #include <asm/unistd.h>