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 address, even though a physical address would be more convenient for 32 bits;" In other words, pa() converted it to a physical adddress - and now we're converting it back to a virtual address....
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