root/trapasm.S

   1 #include "mmu.h"
   3   # vectors.S sends all traps here.
   4 .globl alltraps
   5 alltraps:
   6   # Build trap frame.
   7   pushl %ds
   8   pushl %es
   9   pushl %fs
  10   pushl %gs
  11   pushal
  13   # Set up data and per-cpu segments.
  14   movw $(SEG_KDATA<<3), %ax
  15   movw %ax, %ds
  16   movw %ax, %es
  17   movw $(SEG_KCPU<<3), %ax
  18   movw %ax, %fs
  19   movw %ax, %gs
  21   # Call trap(tf), where tf=%esp
  22   pushl %esp
  23   call trap
  24   addl $4, %esp
  26   # Return falls through to trapret...
  27 .globl trapret
  28 trapret:
  29   popal
  30   popl %gs
  31   popl %fs
  32   popl %es
  33   popl %ds
  34   addl $0x8, %esp  # trapno and errcode
  35   iret