Ago1.20.0 occlum #6
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… sgx tee tee libos occlum hooks all syscall by providing a special glibc or musl implementation to support java and c++ in sgx tee， but go's syscall is not dependent on glibc and musl，it was implemented by plan9 assembly in go runtime directly. we need to hook all syscalls by replacing syscall instruction and jump into occlum syscall process entry. Reviewed-by: lei.yul <[email protected]> Reviewed-by: denghui.ddh <[email protected]> Reviewed-by: qingfeng.yy <[email protected]>
go internal-abi defines x15 register as fixed zero value to initialize some stack variables in x64 architecture. but tee libos occlum could not guarantee to clear x15 when a syscall returns, so ago have to clear x15 when a occlum syscall returned to prevent x15 register from pollution. Reviewed-by: lei.yul <[email protected]> Reviewed-by: denghui.ddh <[email protected]> Reviewed-by: qingfeng.yy <[email protected]>
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