diff --git a/ChangeLog b/ChangeLog
index d249e1c..b9d832b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2017-11-21  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* example-fsm-55: Update using stack-def.h.
+
 2017-11-20  NIIBE Yutaka  <gniibe@fsij.org>
 
 	* example-led: Update using stack-def.h.
diff --git a/example-fsm-55/debian-logo.c b/example-fsm-55/debian-logo.c
index c12d24b..2b68b9c 100644
--- a/example-fsm-55/debian-logo.c
+++ b/example-fsm-55/debian-logo.c
@@ -163,17 +163,19 @@ button (void *arg)
   return NULL;
 }
 
+#define STACK_MAIN
+#define STACK_PROCESS_1
+#define STACK_PROCESS_2
+#include "stack-def.h"
+
 #define PRIO_LED 3
 #define PRIO_BUTTON 2
 
-extern uint8_t __process1_stack_base__[], __process1_stack_size__[];
-extern uint8_t __process2_stack_base__[], __process2_stack_size__[];
+#define STACK_ADDR_LED ((uint32_t)process1_base)
+#define STACK_SIZE_LED (sizeof process1_base)
 
-#define STACK_ADDR_LED ((uint32_t)__process1_stack_base__)
-#define STACK_SIZE_LED ((uint32_t)__process1_stack_size__)
-
-#define STACK_ADDR_BUTTON ((uint32_t)__process2_stack_base__)
-#define STACK_SIZE_BUTTON ((uint32_t)__process2_stack_size__)
+#define STACK_ADDR_BUTTON ((uint32_t)process2_base)
+#define STACK_SIZE_BUTTON (sizeof process2_base)
 
 #define DATA55(x0,x1,x2,x3,x4) (x0<<20)|(x1<<15)|(x2<<10)|(x3<< 5)|(x4<< 0)
 #define SIZE55(img) (sizeof (img) / sizeof (uint32_t))
diff --git a/example-fsm-55/hacker-emblem.ld b/example-fsm-55/hacker-emblem.ld
index 852e458..74cb9d9 100644
--- a/example-fsm-55/hacker-emblem.ld
+++ b/example-fsm-55/hacker-emblem.ld
@@ -1,12 +1,6 @@
 /*
  * ST32F0 memory setup.
  */
-__main_stack_size__     = 0x0100;  /* Idle+Exception handlers */
-__process0_stack_size__  = 0x0100; /* Main program            */
-__process1_stack_size__  = 0x0100; /* first thread program    */
-__process2_stack_size__  = 0x0100; /* second thread program   */
-__process3_stack_size__  = 0x0100; /* third thread program    */
-
 MEMORY
 {
     flash  : org = 0x08000000, len = 16k
@@ -61,34 +55,15 @@ SECTIONS
     _etext = .;
     _textdata = _etext;
 
-    .process_stack :
+    .stacks (NOLOAD) :
     {
         . = ALIGN(8);
-        __process3_stack_base__ = .;
-        . += __process3_stack_size__;
+        *(.main_stack)
+        *(.process_stack.0)
+        *(.process_stack.1)
+        *(.process_stack.2)
+        *(.process_stack.3)
         . = ALIGN(8);
-        __process3_stack_end__ = .;
-        __process2_stack_base__ = .;
-        . += __process2_stack_size__;
-        . = ALIGN(8);
-        __process2_stack_end__ = .;
-        __process1_stack_base__ = .;
-        . += __process1_stack_size__;
-        . = ALIGN(8);
-        __process1_stack_end__ = .;
-        __process0_stack_base__ = .;
-        . += __process0_stack_size__;
-        . = ALIGN(8);
-        __process0_stack_end__ = .;
-    } > ram
-
-    .main_stack :
-    {
-        . = ALIGN(8);
-        __main_stack_base__ = .;
-        . += __main_stack_size__;
-        . = ALIGN(8);
-        __main_stack_end__ = .;
     } > ram
 
     .data :
diff --git a/example-fsm-55/hh.c b/example-fsm-55/hh.c
index 4c4fd58..1ca9eaa 100644
--- a/example-fsm-55/hh.c
+++ b/example-fsm-55/hh.c
@@ -166,14 +166,16 @@ button (void *arg)
 #define PRIO_LED 3
 #define PRIO_BUTTON 2
 
-extern uint8_t __process1_stack_base__[], __process1_stack_size__[];
-extern uint8_t __process2_stack_base__[], __process2_stack_size__[];
+#define STACK_MAIN
+#define STACK_PROCESS_1
+#define STACK_PROCESS_2
+#include "stack-def.h"
 
-#define STACK_ADDR_LED ((uint32_t)__process1_stack_base__)
-#define STACK_SIZE_LED ((uint32_t)__process1_stack_size__)
+#define STACK_ADDR_LED ((uint32_t)process1_base)
+#define STACK_SIZE_LED (sizeof process1_base)
 
-#define STACK_ADDR_BUTTON ((uint32_t)__process2_stack_base__)
-#define STACK_SIZE_BUTTON ((uint32_t)__process2_stack_size__)
+#define STACK_ADDR_BUTTON ((uint32_t)process2_base)
+#define STACK_SIZE_BUTTON (sizeof process2_base)
 
 #define DATA55(x0,x1,x2,x3,x4) (x0<<20)|(x1<<15)|(x2<<10)|(x3<< 5)|(x4<< 0)
 #define SIZE55(img) (sizeof (img) / sizeof (uint32_t))
diff --git a/example-fsm-55/hiroshi-ayumi.c b/example-fsm-55/hiroshi-ayumi.c
index c300316..1d21d41 100644
--- a/example-fsm-55/hiroshi-ayumi.c
+++ b/example-fsm-55/hiroshi-ayumi.c
@@ -86,12 +86,16 @@ led_enable_column (uint8_t col)
 }
 
 
+#define STACK_MAIN
+#define STACK_PROCESS_1
+#define STACK_PROCESS_2
+#define STACK_PROCESS_3
+#include "stack-def.h"
+
 #define PRIO_LED 3
 
-extern uint8_t __process1_stack_base__[], __process1_stack_size__[];
-
-#define STACK_ADDR_LED ((uint32_t)__process1_stack_base__)
-#define STACK_SIZE_LED ((uint32_t)__process1_stack_size__)
+#define STACK_ADDR_LED ((uint32_t)process1_base)
+#define STACK_SIZE_LED (sizeof process1_base)
 
 static void *
 led (void *arg)
@@ -119,10 +123,9 @@ led (void *arg)
 
 
 #define PRIO_SPK 4
-extern uint8_t __process2_stack_base__[], __process2_stack_size__[];
 
-#define STACK_ADDR_SPK ((uint32_t)__process2_stack_base__)
-#define STACK_SIZE_SPK ((uint32_t)__process2_stack_size__)
+#define STACK_ADDR_SPK ((uint32_t)process2_base)
+#define STACK_SIZE_SPK (sizeof process2_base)
 
 static chopstx_mutex_t spk_mtx;
 static chopstx_cond_t spk_cnd;
@@ -193,10 +196,9 @@ spk (void *arg)
 
 
 #define PRIO_MUSIC 2
-extern uint8_t __process3_stack_base__[], __process3_stack_size__[];
 
-#define STACK_ADDR_MUSIC ((uint32_t)__process3_stack_base__)
-#define STACK_SIZE_MUSIC ((uint32_t)__process3_stack_size__)
+#define STACK_ADDR_MUSIC ((uint32_t)process3_base)
+#define STACK_SIZE_MUSIC (sizeof process3_base)
 
 #define C 0
 #define D 1
diff --git a/example-fsm-55/stack-def.h b/example-fsm-55/stack-def.h
new file mode 100644
index 0000000..880dfd9
--- /dev/null
+++ b/example-fsm-55/stack-def.h
@@ -0,0 +1,54 @@
+#define MAIN_SIZE 0x0080 /* Idle+Exception handlers  */
+#define SIZE_0 0x0100 /* Main program             */
+#define SIZE_1 0x0100 /* first thread program     */
+#define SIZE_2 0x0100 /* second thread program    */ 
+#define SIZE_3 0x0100 /* third thread program     */ 
+
+#if defined(STACK_MAIN)
+/*
+ * The terminology of "main" is confusing in ARM architecture.
+ * Here, "main_base" is for exception handlers.
+ */
+/* Idle+Exception handlers */
+char __main_stack_end__[0] __attribute__ ((section(".main_stack")));
+char main_base[MAIN_SIZE] __attribute__ ((section(".main_stack")));
+
+/* Main program            */
+char __process0_stack_end__[0] __attribute__ ((section(".process_stack.0")));
+char process0_base[SIZE_0] __attribute__ ((section(".process_stack.0")));
+#endif
+
+/* First thread program    */
+#if defined(STACK_PROCESS_1)
+char process1_base[SIZE_1] __attribute__ ((section(".process_stack.1"))); 
+#endif
+
+/* Second thread program   */
+#if defined(STACK_PROCESS_2)
+char process2_base[SIZE_2] __attribute__ ((section(".process_stack.2")));
+#endif
+
+/* Third thread program    */
+#if defined(STACK_PROCESS_3)
+char process3_base[SIZE_3] __attribute__ ((section(".process_stack.3")));
+#endif
+
+/* Fourth thread program    */
+#if defined(STACK_PROCESS_4)
+char process4_base[SIZE_4] __attribute__ ((section(".process_stack.4")));
+#endif
+
+/* Fifth thread program    */
+#if defined(STACK_PROCESS_5)
+char process5_base[SIZE_5] __attribute__ ((section(".process_stack.5")));
+#endif
+
+/* Sixth thread program    */
+#if defined(STACK_PROCESS_6)
+char process6_base[SIZE_6] __attribute__ ((section(".process_stack.6")));
+#endif
+
+/* Seventh thread program    */
+#if defined(STACK_PROCESS_7)
+char process7_base[SIZE_7] __attribute__ ((section(".process_stack.7")));
+#endif