Hi!
>>>> Hmm, maybe I know where problem could be. Try
>>>>
>>>> movl $(wakeup_stack - wakeup_code), %esp #
>>>> Private stack is needed for ASUS bo\
>>>>
>>>> instead of existing stack setup. That helped on one of my test-boxes
>>> Thanks, I will try that.
>>> Because clearing the flags imply pop/push in the stack it could be the
>>> problem
>> That doesn't help : it still crash in pushl $0.
>>
> All stack stuff in wakeup_code crash for me.
> I tried to change the stack position, make sure upper bit of %esp are
> clear, ... nothing work.
> What's are strange is that according to my x86 manual, in real mode the
> failure can only happen if the stack wrap which is not the case here.
> Any x86 guru advice ?
Could you try the .c wakeup? I changed it a bit, perhaps that's enough.
> If I remove stack access (remove clearing flag stuff, not call to video
> stuff) the resume works.
Actually, I see a possible problem:
_start:
cli
cld
/* Set up segments */
movw %cs,%ax
movw %ax,%ds
movw %ax,%es
movw %ax,%ss
movl $wakeup_stack_end, %esp
/* Clear the EFLAGS */
pushl $0
popfl
...if someone calls start as 0x1234:0, we are okay. But if some broken
bios calls us as 0x1:0x234, we've got a problem.
One possible hack would be to movl 0, %esp. That should put the stack
at _start, corrupting memory but hopefully helping you diagnose it.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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