xv6/trapasm.S

#include "mmu.h"

  # vectors.S sends all traps here.
.globl alltraps
alltraps:
  # Build trap frame.
  pushl %ds
  pushl %es
  pushl %fs
  pushl %gs
  pushal
  
  # Set up data and per-cpu segments.
  movw $(SEG_KDATA<<3), %ax
  movw %ax, %ds
  movw %ax, %es
  movw $(SEG_KCPU<<3), %ax
  movw %ax, %fs
  movw %ax, %gs

  # Call trap(tf), where tf=%esp
  pushl %esp
  call trap
  addl $4, %esp

  # Return falls through to trapret...
.globl trapret
trapret:
  popal
  popl %gs
  popl %fs
  popl %es
  popl %ds
  addl $0x8, %esp  # trapno and errcode
  iret
One definition of several macros and constants 2011-08-08 17:30:08 +00:00			`#include "mmu.h"`
formatting, fix comment 2007-08-27 13:11:13 +00:00
			`# vectors.S sends all traps here.`
nits 2007-08-28 18:23:48 +00:00			`.globl alltraps`
more or less take traps/interrupts 2006-06-13 15:50:06 +00:00			`alltraps:`
formatting, fix comment 2007-08-27 13:11:13 +00:00			`# Build trap frame.`
			`pushl %ds`
			`pushl %es`
always save and restore %fs, %gs to ensure old segment entries are never accessible to user from the hidden CPU segment registers. 2008-09-24 01:48:31 +00:00			`pushl %fs`
			`pushl %gs`
formatting, fix comment 2007-08-27 13:11:13 +00:00			`pushal`

sync with c; .text is implied 2009-05-31 01:00:38 +00:00			`# Set up data and per-cpu segments.`
			`movw $(SEG_KDATA<<3), %ax`
			`movw %ax, %ds`
			`movw %ax, %es`
			`movw $(SEG_KCPU<<3), %ax`
			`movw %ax, %fs`
			`movw %ax, %gs`
formatting, fix comment 2007-08-27 13:11:13 +00:00
			`# Call trap(tf), where tf=%esp`
			`pushl %esp`
			`call trap`
spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00			`addl $4, %esp`
standardize various * conventions 2006-09-06 17:27:19 +00:00
formatting, fix comment 2007-08-27 13:11:13 +00:00			`# Return falls through to trapret...`
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 01:15:28 +00:00			`.globl trapret`
import 2006-06-12 15:22:12 +00:00			`trapret:`
spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00			`popal`
always save and restore %fs, %gs to ensure old segment entries are never accessible to user from the hidden CPU segment registers. 2008-09-24 01:48:31 +00:00			`popl %gs`
			`popl %fs`
spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00			`popl %es`
			`popl %ds`
formatting, fix comment 2007-08-27 13:11:13 +00:00			`addl $0x8, %esp # trapno and errcode`
spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00			`iret`