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rsc authoredPDF at http://am.lcs.mit.edu/~rsc/xv6.pdf Various changes made while offline. + bwrite sector argument is redundant; use b->sector. + reformatting of files for nicer PDF page breaks + distinguish between locked, unlocked inodes in type signatures + change FD_FILE to FD_INODE + move userinit (nee proc0init) to proc.c + move ROOTDEV to param.h + always parenthesize sizeof argument
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trapasm.S 675 B
.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