Nevar pievienot vairāk kā 25 tēmas
Tēmai ir jāsākas ar burtu vai ciparu, tā var saturēt domu zīmes ('-') un var būt līdz 35 simboliem gara.
49 rindas
988 B
49 rindas
988 B
#include <memlayout.h>
|
|
|
|
# vectors.S sends all traps here.
|
|
.text
|
|
.globl __alltraps
|
|
__alltraps:
|
|
# push registers to build a trap frame
|
|
# therefore make the stack look like a struct trapframe
|
|
pushl %ds
|
|
pushl %es
|
|
pushl %fs
|
|
pushl %gs
|
|
pushal
|
|
|
|
# load GD_KDATA into %ds and %es to set up data segments for kernel
|
|
movl $GD_KDATA, %eax
|
|
movw %ax, %ds
|
|
movw %ax, %es
|
|
|
|
# push %esp to pass a pointer to the trapframe as an argument to trap()
|
|
pushl %esp
|
|
|
|
# call trap(tf), where tf=%esp
|
|
call trap
|
|
|
|
# pop the pushed stack pointer
|
|
popl %esp
|
|
|
|
# return falls through to trapret...
|
|
.globl __trapret
|
|
__trapret:
|
|
# restore registers from stack
|
|
popal
|
|
|
|
# restore %ds, %es, %fs and %gs
|
|
popl %gs
|
|
popl %fs
|
|
popl %es
|
|
popl %ds
|
|
|
|
# get rid of the trap number and error code
|
|
addl $0x8, %esp
|
|
iret
|
|
|
|
.globl forkrets
|
|
forkrets:
|
|
# set stack to this new process's trapframe
|
|
movl 4(%esp), %esp
|
|
jmp __trapret
|