X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=doc%2Fuserprog.texi;h=817c8a0b31ade12e43477dc1eee70ad236349285;hb=ee3116952fce74dde22dd0ce78fa2f97eaadd1a6;hp=903d9c53311dcd856860b10a5749ffdbd234d3ab;hpb=23da5dabffdcfe6edd4e28f84b712c8be97f1b51;p=pintos-anon

diff --git a/doc/userprog.texi b/doc/userprog.texi
index 903d9c5..817c8a0 100644
--- a/doc/userprog.texi
+++ b/doc/userprog.texi
@@ -129,7 +129,7 @@ system implementation.
 
 You need to be able to create and format simulated disks.  The
 @command{pintos} program provides this functionality with its
-@option{make-disk} command.  From the @file{filesys/build} directory,
+@option{make-disk} command.  From the @file{userprog/build} directory,
 execute @code{pintos make-disk fs.dsk 2}.  This command creates a 2 MB
 simulated disk named @file{fs.dsk}.  (It does not actually start
 Pintos.)  Then format the disk by passing the @option{-f} option to
@@ -396,6 +396,14 @@ You may find the code for @func{thread_join} to be useful in
 implementing the join syscall, but besides that, you can use
 the original code provided for project 1.
 
+@item
+@b{All my user programs die with page faults.}
+
+This will generally happen if you haven't implemented problem 2-1
+yet.  The reason is that the basic C library for user programs tries
+to read @var{argc} and @var{argv} off the stack.  Because the stack
+isn't properly set up yet, this causes a page fault.
+
 @item
 @b{Is there a way I can disassemble user programs?}
 
@@ -417,7 +425,7 @@ is compiled as a unit.)  If you wish to port libraries to Pintos, feel
 free.
 
 @item
-@b{How do I compile new user programs? How do I make 'echo' compile?}
+@b{How do I compile new user programs?}
 
 You need to modify @file{tests/Makefile}.