banan-os/kernel/arch/i686/Signal.S

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.section .userspace, "aw"
// stack contains
// return address
// signal number
// signal handler
.global signal_trampoline
signal_trampoline:
ud2
pushl %ebp
movl %esp, %ebp
subl $8, %esp
pusha
movl 40(%esp), %edi
movl 36(%esp), %eax
subl $12, %esp
pushl %edi
call *%eax
addl $16, %esp
popa
leave
addl $8, %esp
ret