On 02/09/2014 03:45 AM, Stefani Seibold wrote:
>>
>> Yes the syscall does, but the vsyscall stub does not (for the !0x80 case)
>
> I cross check all kinds of vsyscall and all do save the ECX registers.
>
> So IMHO i see no register modification other than EAX, which is declared
> as the output register in the asm() directive.
>
That is, indeed, correct, as the 32-bit vsyscall stubs are explicitly
designed to be drop-in replacements for the int $0x80 instruction.
-hpa
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