Re: [Qemu-devel] [Patch] Make usermode stacksize (-s) configurable at compile-time

[Jan-Simon Möller]

We encontered problems with the low default value for the stacksize in usermode 
(ok, whats "low"). 
For environments like scratchbox, its hard to use "-s" as qemu is called by 
binfmt mechanism.
The attached patch makes this configurable at compile-time.

Signed-off-by: Jan-Simon Möller <address@hidden>

diff --git a/configure b/configure                                     
index 43d87c5..dad9175 100755                                          
--- a/configure                                                        
+++ b/configure                                                        
@@ -220,6 +220,7 @@ uname_release=""                                   
 io_thread="no"                                                        
 mixemu="no"                                                           
 kerneldir=""                                                          
+user_mode_stacksize=""                                                
 aix="no"                                                              
 blobs="yes"                                                           
 pkgversion=""                                                         
@@ -557,6 +558,8 @@ for opt do                                         
   ;;                                                                  
   --kerneldir=*) kerneldir="$optarg"                                  
   ;;                                                                  
+  --user-mode-stacksize=*) user_mode_stacksize="$optarg"              
+  ;;                                                                  
   --with-pkgversion=*) pkgversion=" ($optarg)"                        
   ;;                                                                  
   --disable-docs) docs="no"                                           
@@ -713,6 +716,7 @@ echo "  --enable-linux-aio       enable Linux AIO support"
 echo "  --enable-io-thread       enable IO thread"
 echo "  --disable-blobs          disable installing provided firmware blobs"
 echo "  --kerneldir=PATH         look for kernel includes in PATH"
+echo "  --user-mode-stacksize=   set default stack size in bytes (as -s, only 
in usermode)"
 echo ""
 echo "NOTE: The object files are built at the place where configure is 
launched"
 exit 1
@@ -2481,6 +2485,16 @@ if test "$target_user_only" = "yes" -a "$static" = "no" 
-a \
   ldflags="-pie $ldflags"
 fi

+# change default stacksize in usermode
+#
+if test "$target_user_only" = "yes" -a "$user_mode_stacksize" != "" ; then
+ cflags="-DUSER_MODE_STACKSIZE=$user_mode_stacksize $cflags"
+ echo "user_mode_stack   $user_mode_stacksize"
+else
+ echo "user_mode_stack   default"
+fi
+
+
 if test "$target_softmmu" = "yes" -a \( \
         "$TARGET_ARCH" = "microblaze" -o \
         "$TARGET_ARCH" = "cris" \) ; then
diff --git a/linux-user/main.c b/linux-user/main.c
index 81a1ada..9ac2421 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -51,7 +51,10 @@ const char *qemu_uname_release = CONFIG_UNAME_RELEASE;
 /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
    we allocate a bigger stack. Need a better solution, for example
    by remapping the process stack directly at the right place */
-unsigned long x86_stack_size = 512 * 1024;
+#ifndef USER_MODE_STACKSIZE
+#define USER_MODE_STACKSIZE (512 * 1024)
+#endif
+unsigned long x86_stack_size = USER_MODE_STACKSIZE;

 void gemu_log(const char *fmt, ...)
 {

usermode_stacksize.diff
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