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- /*
- * 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.
- */
- .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 0xf57ff05f // dmb sy
- .inst 0xe1b20f9f // 1: ldrexd r0, r1, [r2]
- .inst 0xe0303004 // eors r3, r0, r4
- .inst 0x00313005 // eoreqs r3, r1, r5
- .inst 0x01a23f96 // strexdeq r3, r6, [r2]
- .inst 0x03330001 // teqeq r3, #1
- .inst 0x0afffff9 // beq 1b
- .inst 0xf57ff05f // dmb sy
- .inst 0xe2730000 // rsbs r0, r3, #0
- .inst 0xe8bd00f0 // pop {r4, r5, r6, r7}
- .inst 0xe12fff1e // bx lr
- .align 5
- __kuser_memory_barrier: // 0xffff0fa0
- .inst 0xf57ff05f // dmb sy
- .inst 0xe12fff1e // bx lr
- .align 5
- __kuser_cmpxchg: // 0xffff0fc0
- .inst 0xf57ff05f // dmb sy
- .inst 0xe1923f9f // 1: ldrex r3, [r2]
- .inst 0xe0533000 // subs r3, r3, r0
- .inst 0x01823f91 // strexeq r3, r1, [r2]
- .inst 0x03330001 // teqeq r3, #1
- .inst 0x0afffffa // beq 1b
- .inst 0xe2730000 // rsbs r0, r3, #0
- .inst 0xeaffffef // b <__kuser_memory_barrier>
- .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:
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