Date: Mon, 20 Jul 2009 11:38:15 +0800 From: Chao Xie <xiechao.mail@gmail.com> To: freebsd-arm@freebsd.org Subject: start_init data abort Message-ID: <c11a0ecf0907192038t6ba7ba11g2b41591fe4285e3@mail.gmail.com>
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hi
I am trying to port Freebsd to pxa310. After I have compiled, and get
kernel.bin, i will directly download it to SDRAM, and begin to run it. The
SYSINITs are all right, and i get the final init - start_init. At this time,
a exception of data abort happens.
After i debug it, i find it is caused by subyte at the following code.
/*
* Move out the boot flag argument.
*/
options = 0;
ucp = (char *)p->p_sysent->sv_usrstack;
(void)subyte(--ucp, 0); /* trailing zero */
if (boothowto & RB_SINGLE) {
(void)subyte(--ucp, 's');
options = 1;
}
It seems that subyte will store a byte to user stack of initproc. The user
stack of initproc is started at 0xC0000000. i have checked the page mapping,
and find the veirtual address 0xC0000000 - PAGESIZE to 0xC0000000 is not
mapped. So i get the data abort.
I am confuesed. Where should i map the user stack of initproc? I appreciate
that someone can help me.Thanks.
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