On Wed, 28 Dec 2005, Denis Vlasenko wrote:
> On Wednesday 28 December 2005 15:14, linux-os (Dick Johnson) wrote:
>>>> Anyway, getting down to 20 bytes of stack-space available
>>>> seems to be pretty scary.
>>>
>>> + movl %esp, %edi
>>> + movl %edi, %ecx
>>> + andl $~0x1000, %edi
>>> + subl %edi, %ecx
>>>
>>> ecx will be equal to ?
>>
>> Whatever the stack was minus that value ANDed with NOT 0x1000,
>> i.e. 0x1000 minus the stack already in use. The code assumes
>> that the stack starts and ends on a 0x1000 (page) boundary.
>> If that's not true, then all bets are off.
>
> Hmm. I must be thick today. (esp - (esp & 0xffffefff))
> is always equal to (esp & 0x00001000). Which is either 0 or 0x1000.
> --
>
Yes it's supposed to be ~0xfff.
vda
>
Cheers,
Dick Johnson
Penguin : Linux version 2.6.13.4 on an i686 machine (5591.11 BogoMips).
Warning : 98.36% of all statistics are fiction.
.
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