关于U-BOOT引导的最后阶段出现未定义指令异常中断，大侠求教..

void  call_linux(long a0, long a1, long a2)
{
__asm__(

//"mov
r0, %0\n"

//"mov
r1, %1\n"

//"mov
r2, %2\n"

"mov
r0, a0\n"

"mov
r1, a1\n"

"mov
r2, a2\n"

"mov
ip, #0\n"

"mcr
p15, 0, ip, c13, c0, 0\n"
/* zero PID */

"mcr
p15, 0, ip, c7, c7, 0\n"
/* invalidate I,D caches */

"mcr
p15, 0, ip, c7, c10, 4\n"
/* drain write buffer */

"mcr
p15, 0, ip, c8, c7, 0\n"
/* invalidate I,D TLBs */

"mrc
p15, 0, ip, c1, c0, 0\n"
/* get control register */

"bic
ip, ip, #0x0001\n"
/* disable MMU */

"mcr
p15, 0, ip, c1, c0, 0\n"
/* write control register */

"mov
pc, r2\n"

"nop\n"

"nop\n"

: /* no outpus */

: "r" (a0), "r" (a1), "r" (a2)

: "r0","r1","r2","ip"

);
}


引导内核最后一步，居然出现了未定义指令异常中断，看了半天，也没搞明白

我是用的是TQ带的U-BOOT源码...........