fixed typo.

[pintos-anon] / doc / userprog.texi

diff --git a/doc/userprog.texi b/doc/userprog.texi
index 75123849b0622bcd7aa312a462cba104a36761de..ff98074f8de198ea6465271848f573e7d5c73d7d 100644 (file)
--- a/doc/userprog.texi
+++ b/doc/userprog.texi
@@ -295,8 +295,8 @@ Kernel virtual memory is global.  It is always mapped the same way,
 regardless of what user process or kernel thread is running.  In
 Pintos, kernel virtual memory is mapped one-to-one to physical
 memory, starting at @code{PHYS_BASE}.  That is, virtual address
 regardless of what user process or kernel thread is running.  In
 Pintos, kernel virtual memory is mapped one-to-one to physical
 memory, starting at @code{PHYS_BASE}.  That is, virtual address

-@code{PHYS_ADDR} accesses physical
-address 0, virtual address @code{PHYS_ADDR} + @t{0x1234} access
+@code{PHYS_BASE} accesses physical
+address 0, virtual address @code{PHYS_BASE} + @t{0x1234} access

 physical address @t{0x1234}, and so on up to the size of the machine's
 physical memory.
 
 physical address @t{0x1234}, and so on up to the size of the machine's
 physical memory.
 


@@ -453,7 +453,7 @@ parallel:
 
 @itemize
 @item
 
 @itemize
 @item

-Argument passing (@pxref{Argument Passing}).  Every user programs will
+Argument passing (@pxref{Argument Passing}).  Every user program will

 page fault immediately until argument passing is implemented.
 
 For now, you may simply wish to change
 page fault immediately until argument passing is implemented.
 
 For now, you may simply wish to change


@@ -468,6 +468,11 @@ in @func{setup_stack}.  That will work for any test program that doesn't
 examine its arguments, although its name will be printed as
 @code{(null)}.
 
 examine its arguments, although its name will be printed as
 @code{(null)}.
 

+Until you implement argument passing, you should only run programs
+without passing command-line arguments.  Attempting to pass arguments to
+a program will include those arguments in the name of the program, which
+will probably fail.
+

 @item
 User memory access (@pxref{Accessing User Memory}).  All system calls
 need to read user memory.  Few system calls need to write to user
 @item
 User memory access (@pxref{Accessing User Memory}).  All system calls
 need to read user memory.  Few system calls need to write to user