I'm just trying to figure out the reason why signal must be delivered one at a
time instead of building a frame with multiple calls with only the last one
chaining back to the kernel.
All previous calls instead of calling the stub that jump back to the kernel
will call a small stub like ( Ix86 ) :
stkclean_stub:
add $frame_size, %esp
cmp %esp, $end_stubs
jae $sigreturn_stub
ret
sigreturn_stub:
mov __NR_sigreturn, %eax
int $0x80
end_stubs:
...
| context1
* $stkclean_stub
* sigh1_eip
| context0
* $stkclean_stub
* sigh0_eip
When sigh0 return, it'll call stkclean_stub that will clean context0 and if
we're at the end it'll call the jump-back-to-kernel stub, otherwise the it'll
execute the ret the will call sigh1 handler ... and so on.
- Davide
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This archive was generated by hypermail 2b29 : Sat Jun 23 2001 - 21:00:39 EST