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trapasm.S

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+#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 segments.
+    movw $(SEG_KDATA<<3), %ax
+    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 %gs
+    popl %fs
+    popl %es
+    popl %ds
+    addl $0x8, %esp  # trapno and errcode
+    iret