xv6/trapasm.S

.text
.globl trap
.globl trapret1
.globl alltraps

.set SEG_KDATA_SEL  0x10   # selector for SEG_KDATA

  # vectors.S sends all traps here.
alltraps:
  # Build trap frame.
  pushl %ds
  pushl %es
  pushal
  
  # Set up data segments.
  movl $SEG_KDATA_SEL, %eax
  movw %ax,%ds
  movw %ax,%es

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

  # Return falls through to trapret...
.globl trapret
trapret:
  popal
  popl %es
  popl %ds
  addl $0x8, %esp  # trapno and errcode
  iret

  # A forked process switches to user mode by calling
  # forkret1(tf), where tf is the trap frame to use.
.globl forkret1
forkret1:
  movl 4(%esp), %esp
  jmp trapret
spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00			`.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 01:15:28 +00:00			`.globl trap`
			`.globl trapret1`
			`.globl alltraps`
formatting, fix comment 2007-08-27 13:11:13 +00:00
			`.set SEG_KDATA_SEL 0x10 # selector for SEG_KDATA`

			`# vectors.S sends all traps here.`
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`
			`pushal`

			`# Set up data segments.`
			`movl $SEG_KDATA_SEL, %eax`
			`movw %ax,%ds`
			`movw %ax,%es`

			`# 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`
			`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`
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 01:28:57 +00:00
formatting, fix comment 2007-08-27 13:11:13 +00:00			`# A forked process switches to user mode by calling`
			`# forkret1(tf), where tf is the trap frame to use.`
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 01:47:40 +00:00			`.globl forkret1`
			`forkret1:`
spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00			`movl 4(%esp), %esp`
			`jmp trapret`
standardize various * conventions 2006-09-06 17:27:19 +00:00