X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;ds=sidebyside;f=src%2Fuserprog%2Fexception.c;h=745adaa086e4614245748ddd3cbc6c6262b1f5de;hb=f0ad7eb8b43516c7a2999fd217ec85d954dfc791;hp=8b2e8b641adf7b90168b7b3ff4b3ae81e2bf4d6c;hpb=3c9ec8fccaf30bdf29a8fcdaf129698ef01350cf;p=pintos-anon

diff --git a/src/userprog/exception.c b/src/userprog/exception.c
index 8b2e8b6..745adaa 100644
--- a/src/userprog/exception.c
+++ b/src/userprog/exception.c
@@ -132,7 +132,10 @@ page_fault (struct intr_frame *f)
   /* Obtain faulting address, the virtual address that was
      accessed to cause the fault.  It may point to code or to
      data.  It is not necessarily the address of the instruction
-     that caused the fault (that's f->eip).  */
+     that caused the fault (that's f->eip).
+     See [IA32-v2a] "MOV--Move to/from Control Registers" and
+     [IA32-v3] 5.14 "Interrupt 14--Page Fault Exception
+     (#PF)". */
   asm ("movl %%cr2, %0" : "=r" (fault_addr));
 
   /* Turn interrupts back on (they were only off so that we could