On Fri, 05 Dec 2014 17:50:40 +0800, åå»ºå¸ said:
>
> I am confused by `leal -__PAGE_OFFSET(%ecx),%esp`.
> `pa(stack_start)` have convert `stack_start` to physicall address.
> why we need `-__PAGE_OFFSET(%ecx)` instead of `%ecx`?
>From the commit message:
"This retains start_stack as a virtual
hello,
arch/x86/kernel/head_32.S:
#define pa(X) ((X) - __PAGE_OFFSET)
__HEAD ENTRY(startup_32) + movl pa(stack_start),%ecx...
+ movl %eax,%ss 2: + leal -__PAGE_OFFSET(%ecx),%esp
I am confused by `leal -__PAGE_OFFSET(%ecx),%esp`.
`pa(stack_start)` have convert `stack_start` to physicall
