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[kernel] Implement sig_restorer for ARM64. Throw error if missing assembly.
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src/kernel/emulation/linux/signal/sig_restorer.S
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src/kernel/emulation/linux/signal/sig_restorer.S
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#ifdef __x86_64__
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_sig_restorer:
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movl $15, %eax
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movl $15, %eax ; rt_sigreturn
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syscall
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#elif defined(__i386__)
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_sig_restorer:
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movl $173, %eax
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movl $173, %eax ; rt_sigreturn
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int $0x80
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#elif defined(__arm64__)
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_sig_restorer:
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mov w8,#139 ; __NR_rt_sigreturn
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svc #0
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#else
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#error "Missing assembly!"
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#endif
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