Messages in this thread | | | Date | Sun, 09 Feb 2014 12:11:08 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH v13 8/9] Add 32 bit VDSO time support for 32 bit kernel |
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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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