| 1 | /* SPDX-License-Identifier: GPL-2.0 */
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| 2 | /*
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| 3 | * AArch32 sigreturn code.
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| 4 | * Based on the kuser helpers in arch/arm/kernel/entry-armv.S.
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| 5 | *
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| 6 | * Copyright (C) 2005-2011 Nicolas Pitre <nico@fluxnic.net>
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| 7 | * Copyright (C) 2012-2018 ARM Ltd.
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| 8 | *
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| 9 | * For ARM syscalls, the syscall number has to be loaded into r7.
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| 10 | * We do not support an OABI userspace.
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| 11 | *
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| 12 | * For Thumb syscalls, we also pass the syscall number via r7. We therefore
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| 13 | * need two 16-bit instructions.
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| 14 | */
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| 15 |
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| 16 | |
| 17 |
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| 18 | .section .rodata
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| 19 | .globl __aarch32_sigret_code_start
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| 20 | __aarch32_sigret_code_start:
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| 21 |
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| 22 | /*
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| 23 | * ARM Code
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| 24 | */
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| 25 | .byte __NR_compat32_sigreturn, 0x70, 0xa0, 0xe3 // mov r7, |
| 26 | .byte __NR_compat32_sigreturn, 0x00, 0x00, 0xef // svc |
| 27 |
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| 28 | /*
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| 29 | * Thumb code
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| 30 | */
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| 31 | .byte __NR_compat32_sigreturn, 0x27 // svc |
| 32 | .byte __NR_compat32_sigreturn, 0xdf // mov r7, |
| 33 |
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| 34 | /*
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| 35 | * ARM code
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| 36 | */
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| 37 | .byte __NR_compat32_rt_sigreturn, 0x70, 0xa0, 0xe3 // mov r7, |
| 38 | .byte __NR_compat32_rt_sigreturn, 0x00, 0x00, 0xef // svc |
| 39 |
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| 40 | /*
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| 41 | * Thumb code
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| 42 | */
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| 43 | .byte __NR_compat32_rt_sigreturn, 0x27 // svc |
| 44 | .byte __NR_compat32_rt_sigreturn, 0xdf // mov r7, |
| 45 |
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| 46 | .globl __aarch32_sigret_code_end
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| 47 | __aarch32_sigret_code_end:
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