Fix asm constraints to avoid SI, DI for byte and word access.

[pintos-anon] / doc / userprog.texi

diff --git a/doc/userprog.texi b/doc/userprog.texi
index 5bd0bb2b0d5681a14ceeeca5e49d9ff2b1ef724c..612bb81ba553166d0796c84a923155a7e404ce45 100644 (file)
--- a/doc/userprog.texi
+++ b/doc/userprog.texi
@@ -443,7 +443,7 @@ put_user (uint8_t *udst, uint8_t byte)
 {
   int error_code;
   asm ("movl $1f, %0; movb %b2, %1; 1:"
-       : "=&a" (error_code), "=m" (*udst) : "r" (byte));
+       : "=&a" (error_code), "=m" (*udst) : "q" (byte));
   return error_code != -1;
 }
 @end verbatim