| /* | |
| * Low-level user helpers placed in the vectors page for AArch32. | |
| * 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. | |
| * | |
| * 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. | |
| * | |
| * See Documentation/arm/kernel_user_helpers.txt for formal definitions. | |
| */ | |
| #include <asm/unistd.h> | |
| .align 5 | |
| .globl __kuser_helper_start | |
| __kuser_helper_start: | |
| __kuser_cmpxchg64: // 0xffff0f60 | |
| .inst 0xe92d00f0 // push {r4, r5, r6, r7} | |
| .inst 0xe1c040d0 // ldrd r4, r5, [r0] | |
| .inst 0xe1c160d0 // ldrd r6, r7, [r1] | |
| .inst 0xe1b20f9f // 1: ldrexd r0, r1, [r2] | |
| .inst 0xe0303004 // eors r3, r0, r4 | |
| .inst 0x00313005 // eoreqs r3, r1, r5 | |
| .inst 0x01a23e96 // stlexdeq r3, r6, [r2] | |
| .inst 0x03330001 // teqeq r3, #1 | |
| .inst 0x0afffff9 // beq 1b | |
| .inst 0xf57ff05b // dmb ish | |
| .inst 0xe2730000 // rsbs r0, r3, #0 | |
| .inst 0xe8bd00f0 // pop {r4, r5, r6, r7} | |
| .inst 0xe12fff1e // bx lr | |
| .align 5 | |
| __kuser_memory_barrier: // 0xffff0fa0 | |
| .inst 0xf57ff05b // dmb ish | |
| .inst 0xe12fff1e // bx lr | |
| .align 5 | |
| __kuser_cmpxchg: // 0xffff0fc0 | |
| .inst 0xe1923f9f // 1: ldrex r3, [r2] | |
| .inst 0xe0533000 // subs r3, r3, r0 | |
| .inst 0x01823e91 // stlexeq r3, r1, [r2] | |
| .inst 0x03330001 // teqeq r3, #1 | |
| .inst 0x0afffffa // beq 1b | |
| .inst 0xf57ff05b // dmb ish | |
| .inst 0xe2730000 // rsbs r0, r3, #0 | |
| .inst 0xe12fff1e // bx lr | |
| .align 5 | |
| __kuser_get_tls: // 0xffff0fe0 | |
| .inst 0xee1d0f70 // mrc p15, 0, r0, c13, c0, 3 | |
| .inst 0xe12fff1e // bx lr | |
| .rep 5 | |
| .word 0 | |
| .endr | |
| __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: |