xv6-cs450/trapasm.S

	.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
import 2006-06-12 17:22:12 +02:00			`.text`
New scheduler. Removed cli and sti stack in favor of tracking number of locks held on each CPU and explicit conditionals in spinlock.c. 2006-07-16 03:15:28 +02:00			`.globl trap`
			`.globl trapret1`

			`.globl alltraps`
more or less take traps/interrupts 2006-06-13 17:50:06 +02:00			`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()`
primitive fork and exit system calls 2006-06-15 18:02:20 +02:00			`addl $4, %esp`
more or less take traps/interrupts 2006-06-13 17:50:06 +02:00			`# return falls through to trapret...`

import 2006-06-12 17:22:12 +02:00			`/*`
			`* a forked process RETs here`
			`* expects ESP to point to a Trapframe`
			`*/`
New scheduler. Removed cli and sti stack in favor of tracking number of locks held on each CPU and explicit conditionals in spinlock.c. 2006-07-16 03:15:28 +02:00			`.globl trapret`
import 2006-06-12 17:22:12 +02:00			`trapret:`
			`popal`
			`popl %es`
			`popl %ds`
			`addl $0x8, %esp /* trapno and errcode */`
			`iret`
checkpoint. booting second processor. stack is messed up, but thanks to cliff and plan 9 code, at least boots and gets into C code. 2006-06-22 03:28:57 +02:00
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 03:47:40 +02:00			`.globl forkret1`
			`forkret1:`
			`movl 4(%esp), %esp`
New scheduler. Removed cli and sti stack in favor of tracking number of locks held on each CPU and explicit conditionals in spinlock.c. 2006-07-16 03:15:28 +02:00			`jmp trapret`
checkpoint. booting second processor. stack is messed up, but thanks to cliff and plan 9 code, at least boots and gets into C code. 2006-06-22 03:28:57 +02:00
			`.globl acpu`
			`acpu:`
			`.long 0`