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  • rsc's avatar
    · 856e1fc1
    rsc authored 
    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.
    856e1fc1
trapasm.S 856 B 
#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