root/arch/arm64/kernel/sigreturn32.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * AArch32 sigreturn code.
   4  * Based on the kuser helpers in arch/arm/kernel/entry-armv.S.
   5  *
   6  * Copyright (C) 2005-2011 Nicolas Pitre <nico@fluxnic.net>
   7  * Copyright (C) 2012-2018 ARM Ltd.
   8  *
   9  * For ARM syscalls, the syscall number has to be loaded into r7.
  10  * We do not support an OABI userspace.
  11  *
  12  * For Thumb syscalls, we also pass the syscall number via r7. We therefore
  13  * need two 16-bit instructions.
  14  */
  15 
  16 #include <asm/unistd.h>
  17 
  18         .globl __aarch32_sigret_code_start
  19 __aarch32_sigret_code_start:
  20 
  21         /*
  22          * ARM Code
  23          */
  24         .byte   __NR_compat_sigreturn, 0x70, 0xa0, 0xe3         // mov  r7, #__NR_compat_sigreturn
  25         .byte   __NR_compat_sigreturn, 0x00, 0x00, 0xef         // svc  #__NR_compat_sigreturn
  26 
  27         /*
  28          * Thumb code
  29          */
  30         .byte   __NR_compat_sigreturn, 0x27                     // svc  #__NR_compat_sigreturn
  31         .byte   __NR_compat_sigreturn, 0xdf                     // mov  r7, #__NR_compat_sigreturn
  32 
  33         /*
  34          * ARM code
  35          */
  36         .byte   __NR_compat_rt_sigreturn, 0x70, 0xa0, 0xe3      // mov  r7, #__NR_compat_rt_sigreturn
  37         .byte   __NR_compat_rt_sigreturn, 0x00, 0x00, 0xef      // svc  #__NR_compat_rt_sigreturn
  38 
  39         /*
  40          * Thumb code
  41          */
  42         .byte   __NR_compat_rt_sigreturn, 0x27                  // svc  #__NR_compat_rt_sigreturn
  43         .byte   __NR_compat_rt_sigreturn, 0xdf                  // mov  r7, #__NR_compat_rt_sigreturn
  44 
  45         .globl __aarch32_sigret_code_end
  46 __aarch32_sigret_code_end: