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> Shouldn't the ESP value pointed to by KSTK_ESP() point to the beginning of
> the pt_regs structure for the user space application?

first of all, anything can be on the userland stack at the time the
app issued a syscall. but you don't have to bother with the userland
stack at all, pt_regs is created on the kernel stack, check out the
SAVE_ALL macro (and its uses) in arch/i386/kernel/entry.S .

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