xv6/trapasm.S
rsc 856e1fc1ad Attempt to clean up newproc somewhat.
Also remove all calls to memcpy in favor of
memmove, which has defined semantics when
the ranges overlap.  The fact that memcpy was
working in console.c to scroll the screen is not
guaranteed by all implementations.
2006-07-16 01:47:40 +00:00

40 lines
856 B
ArmAsm

#include "mmu.h"
.text
.globl trap
.globl trapret1
.globl alltraps
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...
/*
* a forked process RETs here
* expects ESP to point to a Trapframe
*/
.globl trapret
trapret:
popal
popl %es
popl %ds
addl $0x8, %esp /* trapno and errcode */
iret
.globl forkret1
forkret1:
movl 4(%esp), %esp
jmp trapret
.globl acpu
acpu:
.long 0