Re: Need help in understanding x86 syscall

linux-os (Dick Johnson)
2005-08-11T17:11:07Z

On Thu, 11 Aug 2005, Coywolf Qi Hunt wrote:

> On 8/12/05, Coywolf Qi Hunt <coywolf@gmail.com> wrote:
>> On 8/12/05, Steven Rostedt <rostedt@goodmis.org> wrote:
>>> On Thu, 2005-08-11 at 11:51 -0400, Steven Rostedt wrote:
>>>>
>>>> And booted it. The system is up and running, so I really don't think
>>>> that the sysenter_entry is used for system calls.
>>>>
>>>> Not so "Clear as day"!
>>>
>>> And so, looking into sysenter_entry, it seems that my configurations
>>> don't seem to use it. This jumps straight to system_call without ever
>>> having to turn interrupts on.
>>>
>>> # cat /proc/cpuinfo
>>> processor : 0
>>> vendor_id : GenuineIntel
>>> cpu family : 6
>>> model : 8
>>> model name : Pentium III (Coppermine)
>>> stepping : 3
>>> cpu MHz : 367.939
>>> cache size : 256 KB
>>> fdiv_bug : no
>>> hlt_bug : no
>>> f00f_bug : no
>>> coma_bug : no
>>> fpu : yes
>>> fpu_exception : yes
>>> cpuid level : 2
>>> wp : yes
>>> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
>>> mca cmov pat pse36 mmx fxsr sse
>>> bogomips : 722.94
>>>
>>>
>>> -- Steve
>>>
>>
>> The cpu does have sep. Is it vanilla kernel?
>>
>
> Also glibc support.
>
> --
> Coywolf Qi Hunt
> http://ahbl.org/~coywolf/

Probably doesn't use int 0x80 at all.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.12 on an i686 machine (5537.79 BogoMips).
Warning : 98.36% of all statistics are fiction.
.
I apologize for the following. I tried to kill it with the above dot :

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