| 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 | #include <asm/unistd.h> |
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| 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_compat_sigreturn, 0x70, 0xa0, 0xe3 // mov r7, #__NR_compat_sigreturn |
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| 26 | .byte __NR_compat_sigreturn, 0x00, 0x00, 0xef // svc #__NR_compat_sigreturn |
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| 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_compat_sigreturn, 0x27 // svc #__NR_compat_sigreturn |
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| 32 | .byte __NR_compat_sigreturn, 0xdf // mov r7, #__NR_compat_sigreturn |
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| 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_compat_rt_sigreturn, 0x70, 0xa0, 0xe3 // mov r7, #__NR_compat_rt_sigreturn |
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| 38 | .byte __NR_compat_rt_sigreturn, 0x00, 0x00, 0xef // svc #__NR_compat_rt_sigreturn |
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| 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_compat_rt_sigreturn, 0x27 // svc #__NR_compat_rt_sigreturn |
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| 44 | .byte __NR_compat_rt_sigreturn, 0xdf // mov r7, #__NR_compat_rt_sigreturn |
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| 45 | |
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| 46 | .globl __aarch32_sigret_code_end |
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| 47 | __aarch32_sigret_code_end: |
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| 48 | |
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