initialize register r31(LP) with texit in V850/cpuport.c

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2305 bbd45198-f89e-11dd-88c7-29a3b14d5316

libcpu/v850/cpuport.c

 /*
  * File      : cpuport.c
  * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2009 - 2011, RT-Thread Development Team
+ * COPYRIGHT (C) 2009 - 2012, RT-Thread Development Team
  *
  * The license and distribution terms for this file may be
  * found in the file LICENSE in this distribution or at
@@ -10,6 +10,7 @@
  * Change Logs:
  * Date           Author       Notes
  * 2011-02-23     Bernard      the first version
+ * 2012-09-23     lgnq         initialize register r31(LP) with texit
  */
 
 #include <rtthread.h>
@@ -27,9 +28,9 @@ rt_uint32_t rt_thread_switch_interrupt_flag;
 void rt_hw_interrupt_init(void)
 {
     /* init interrupt nest, and context in thread sp */
-    rt_interrupt_nest = 0;
-    rt_interrupt_from_thread = 0;
-    rt_interrupt_to_thread = 0;
+    rt_interrupt_nest               = 0;
+    rt_interrupt_from_thread        = 0;
+    rt_interrupt_to_thread          = 0;
     rt_thread_switch_interrupt_flag = 0;
 }
 
@@ -43,44 +44,49 @@ void rt_hw_interrupt_init(void)
  *
  * @return stack address
  */
-rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, rt_uint8_t *stack_addr, void *texit)
+rt_uint8_t *rt_hw_stack_init(void       *tentry,
+                             void       *parameter,
+                             rt_uint8_t *stack_addr,
+                             void       *texit)
 {
-    rt_uint32_t *stk;     
-   
-    stk    = (rt_uint32_t *)stack_addr;          /* Load stack pointer                                      */   
-    *(--stk) = (rt_uint32_t) 0x23232323;         /* r23 */   
-    *(--stk) = (rt_uint32_t) 0x24242424;         /* r24 */   
-    *(--stk) = (rt_uint32_t) 0x25252525;         /* r25 */   
-    *(--stk) = (rt_uint32_t) 0x26262626;         /* r26 */   
-    *(--stk) = (rt_uint32_t) 0x27272727;         /* r27 */   
-    *(--stk) = (rt_uint32_t) 0x28282828;         /* r28 */   
-    *(--stk) = (rt_uint32_t) 0x29292929;         /* r29 */   
-    *(--stk) = (rt_uint32_t) 0x30303030;         /* r30 */   
-    *(--stk) = (rt_uint32_t) 0x31313131;         /* r31 */   
-    *(--stk) = (rt_uint32_t) 0x00000000;         /* Task PSW = Interrupts enabled                                 */   
-    *(--stk) = (rt_uint32_t) tentry;             /* Task's PC */   
-    *(--stk) = (rt_uint32_t) 0x16161616;         /* r16 */   
-    *(--stk) = (rt_uint32_t) 0x15151515;         /* r15 */   
-    *(--stk) = (rt_uint32_t) 0x14141414;         /* r14 */   
-    *(--stk) = (rt_uint32_t) 0x13131313;         /* r13 */   
-    *(--stk) = (rt_uint32_t) 0x12121212;         /* r12 */   
-    *(--stk) = (rt_uint32_t) 0x11111111;         /* r11 */   
-    *(--stk) = (rt_uint32_t) 0x10101010;         /* r10 */   
-    *(--stk) = (rt_uint32_t) 0x09090909;         /* r9 */   
-    *(--stk) = (rt_uint32_t) 0x08080808;         /* r8 */   
-    *(--stk) = (rt_uint32_t) 0x07070707;         /* r7 */   
-    *(--stk) = (rt_uint32_t) 0x06060606;         /* r6 */   
-    *(--stk) = (rt_uint32_t) 0x05050505;         /* r5 */   
-    *(--stk) = (rt_uint32_t) 0x02020202;         /* r2 */   
-    *(--stk) = (rt_uint32_t) parameter;          /* r1 */   
-    return ((rt_uint8_t *)stk); 
+    rt_uint32_t *stk;
+
+    stk      = (rt_uint32_t *)stack_addr;    /* Load stack pointer */
+
+    *(--stk) = (rt_uint32_t)0x23232323;      /* r23 */
+    *(--stk) = (rt_uint32_t)0x24242424;      /* r24 */
+    *(--stk) = (rt_uint32_t)0x25252525;      /* r25 */
+    *(--stk) = (rt_uint32_t)0x26262626;      /* r26 */
+    *(--stk) = (rt_uint32_t)0x27272727;      /* r27 */
+    *(--stk) = (rt_uint32_t)0x28282828;      /* r28 */
+    *(--stk) = (rt_uint32_t)0x29292929;      /* r29 */
+    *(--stk) = (rt_uint32_t)0x30303030;      /* r30 */
+    *(--stk) = (rt_uint32_t)texit;           /* r31 */
+    *(--stk) = (rt_uint32_t)0x00000000;      /* Task PSW = Interrupts enabled */
+    *(--stk) = (rt_uint32_t)tentry;          /* Task's PC */
+    *(--stk) = (rt_uint32_t)0x16161616;      /* r16 */
+    *(--stk) = (rt_uint32_t)0x15151515;      /* r15 */
+    *(--stk) = (rt_uint32_t)0x14141414;      /* r14 */
+    *(--stk) = (rt_uint32_t)0x13131313;      /* r13 */
+    *(--stk) = (rt_uint32_t)0x12121212;      /* r12 */
+    *(--stk) = (rt_uint32_t)0x11111111;      /* r11 */
+    *(--stk) = (rt_uint32_t)0x10101010;      /* r10 */
+    *(--stk) = (rt_uint32_t)0x09090909;      /* r9 */
+    *(--stk) = (rt_uint32_t)0x08080808;      /* r8 */
+    *(--stk) = (rt_uint32_t)0x07070707;      /* r7 */
+    *(--stk) = (rt_uint32_t)0x06060606;      /* r6 */
+    *(--stk) = (rt_uint32_t)0x05050505;      /* r5 */
+    *(--stk) = (rt_uint32_t)0x02020202;      /* r2 */
+    *(--stk) = (rt_uint32_t)parameter;       /* r1 */
+
+    return ((rt_uint8_t *)stk);
 }
 
 void rt_hw_context_switch(rt_uint32_t from, rt_uint32_t to)
 {
     rt_interrupt_from_thread = from;
     rt_interrupt_to_thread = to;
-    asm("trap 0x10");    
+    asm("trap 0x10");
 }
 
 void rt_hw_context_switch_interrupt(rt_uint32_t from, rt_uint32_t to)
@@ -88,7 +94,7 @@ void rt_hw_context_switch_interrupt(rt_uint32_t from, rt_uint32_t to)
     if (rt_thread_switch_interrupt_flag != 1)
     {
         rt_thread_switch_interrupt_flag = 1;
-        rt_interrupt_from_thread = from;        
+        rt_interrupt_from_thread = from;
     }
-    rt_interrupt_to_thread = to;  
-}
\ No newline at end of file
+    rt_interrupt_to_thread = to;
+}