xv6-65oo2/trapasm.S
2006-06-22 20:50:32 +00:00

38 lines
882 B
ArmAsm

#include "mmu.h"
.text
.globl alltraps
.globl trap
alltraps:
/* vectors.S sends all traps here */
pushl %ds # build
pushl %es # trap
pushal # frame
movl $16,%eax # SEG_KDATA << 3
movw %ax,%ds # kernel
movw %ax,%es # segments
pushl %esp # pass pointer to this trapframe
call trap # and call trap()
addl $4, %esp
# return falls through to trapret...
.globl trapret
/*
* a forked process RETs here
* expects ESP to point to a Trapframe
*/
trapret:
push $kernel_lock
call release_spinlock
addl $4, %esp
popal
popl %es
popl %ds
addl $0x8, %esp /* trapno and errcode */
iret
.globl acpu
acpu:
.long 0