Date: Mon, 09 Nov 2020 13:59:34 -0800 From: Hydro Flask <hydroflask@...mail.com> To: musl@...ts.openwall.com Subject: Re: x86_64/__set_thread_area clobber of rcx and r11 On 2020-11-09 13:48, Harald Hoyer wrote: > In src/thread/x86_64/__set_thread_area.s, I don't see any special > handling of the registers rcx and r11, > which will be clobbered by the syscall. Is that an oversight, or am I > missing something? The x86_64 ABI states that code should assume all caller-saved registers, which include rcx and r11, are clobbered after the function call. __set_thread_area itself doesn't use rcx or r11, so no other special handling is needed.
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