Divacky Roman wrote:
On Sun, Jul 23, 2006 at 11:18:56PM +0200, Attilio Rao wrote:
2006/7/23, Divacky Roman <[EMAIL PROTECTED]>:
hi,
I need to get content of %esi register as it was during a syscall. Should
I get
this info from td->td_pcb->pcb_esi or td->td_frame->tf_esi?
Is it so that trapframe is "content of registers when entering a kernel"
and
pcb is "when leaving a kernel" ?
thnx for info
pcb and trapframe are used for very different purposes.
The trapframe is built into the exception handler and it is used as
'registers gate' from userspace/kernelspace.
The pcb (process control block) is used to handle registers saving
during a context switch, so it seems completely ortogonal to your
problem.
BTW, it's unclear to me what do you need...
mov $123, %esi
int $0x80 ; syscall
I need the value of %esi (ie. 123)
is td->td_frame->tf_esi what I need?
yes
thnx
roman
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