LXR linux/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:
  47