[uClinux-dev] About system call code in arm-uclinux, Aplio version

From: Zhu, Yaozong (zyz@chinadigipro.com)
Date: Sun Jan 21 2001 - 05:27:51 EST

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Hi all,
	It seems that start_kernel(init/main.c) runs in SVC mode.  And in start_kernel, kernel_thread(init, NULL, 0) is called which does two swi's .   My humble question is ,  when doing system calls from SVC mode, vector_swi(arch/armnommu/kernel/entry-armv.S) saves and restores USER mode registers, and _ret_from_sys_call does restore sp_SVC and spsr_SVC, but lr_SVC is lost, isn't this a problem,  or I am wrong?




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