how use div in or1k

in the C code

a = b/c ; // all integers

after compiler link
it generate a      l.jal 0 <_reset_100-0x100>  , not a div instruction
then jump to here
Disassembly of section .vectors:
     23      
     24 00000000 <_reset_100-0x100>:
     25         ...
     26
     27 00000100 <_reset_100>:
     28      100:       15 00 00 00     l.nop 0x0
     29      104:       00 00 08 1b     l.j 2170 <_reset_except>
     30      108:       15 00 00 00     l.nop 0x0
     31         ...


but a=b*c, will generate a     l.mul r3,r3,r4

how can i compile a correct div?

thank you.