diff options
Diffstat (limited to 'arch/arm64/kernel/kuser32.S')
| -rw-r--r-- | arch/arm64/kernel/kuser32.S | 66 |
1 files changed, 6 insertions, 60 deletions
diff --git a/arch/arm64/kernel/kuser32.S b/arch/arm64/kernel/kuser32.S index 997e6b27ff6a..49825e9e421e 100644 --- a/arch/arm64/kernel/kuser32.S +++ b/arch/arm64/kernel/kuser32.S @@ -1,29 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ /* - * Low-level user helpers placed in the vectors page for AArch32. + * AArch32 user helpers. * Based on the kuser helpers in arch/arm/kernel/entry-armv.S. * * Copyright (C) 2005-2011 Nicolas Pitre <nico@fluxnic.net> - * Copyright (C) 2012 ARM Ltd. - * - * 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. + * Copyright (C) 2012-2018 ARM Ltd. * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - * - * - * AArch32 user helpers. - * - * Each segment is 32-byte aligned and will be moved to the top of the high - * vector page. New segments (if ever needed) must be added in front of - * existing ones. This mechanism should be used only for things that are - * really small and justified, and not be abused freely. + * The kuser helpers below are mapped at a fixed address by + * aarch32_setup_additional_pages() and are provided for compatibility + * reasons with 32 bit (aarch32) applications that need them. * * See Documentation/arm/kernel_user_helpers.txt for formal definitions. */ @@ -77,42 +62,3 @@ __kuser_helper_version: // 0xffff0ffc .word ((__kuser_helper_end - __kuser_helper_start) >> 5) .globl __kuser_helper_end __kuser_helper_end: - -/* - * AArch32 sigreturn code - * - * For ARM syscalls, the syscall number has to be loaded into r7. - * We do not support an OABI userspace. - * - * For Thumb syscalls, we also pass the syscall number via r7. We therefore - * need two 16-bit instructions. - */ - .globl __aarch32_sigret_code_start -__aarch32_sigret_code_start: - - /* - * ARM Code - */ - .byte __NR_compat_sigreturn, 0x70, 0xa0, 0xe3 // mov r7, #__NR_compat_sigreturn - .byte __NR_compat_sigreturn, 0x00, 0x00, 0xef // svc #__NR_compat_sigreturn - - /* - * Thumb code - */ - .byte __NR_compat_sigreturn, 0x27 // svc #__NR_compat_sigreturn - .byte __NR_compat_sigreturn, 0xdf // mov r7, #__NR_compat_sigreturn - - /* - * ARM code - */ - .byte __NR_compat_rt_sigreturn, 0x70, 0xa0, 0xe3 // mov r7, #__NR_compat_rt_sigreturn - .byte __NR_compat_rt_sigreturn, 0x00, 0x00, 0xef // svc #__NR_compat_rt_sigreturn - - /* - * Thumb code - */ - .byte __NR_compat_rt_sigreturn, 0x27 // svc #__NR_compat_rt_sigreturn - .byte __NR_compat_rt_sigreturn, 0xdf // mov r7, #__NR_compat_rt_sigreturn - - .globl __aarch32_sigret_code_end -__aarch32_sigret_code_end: |