diff options
Diffstat (limited to 'libcpu/m16c/stack.c')
| -rw-r--r-- | libcpu/m16c/stack.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/libcpu/m16c/stack.c b/libcpu/m16c/stack.c new file mode 100644 index 0000000000..ae6bc8aa40 --- /dev/null +++ b/libcpu/m16c/stack.c @@ -0,0 +1,59 @@ +/*
+ * File : stack.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2009, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date Author Notes
+ * 2010-04-09 fify the first version
+ *
+ * For : Renesas M16C
+ * Toolchain : IAR's EW for M16C v3.401
+*/
+
+#include <rtthread.h>
+
+/**
+ * This function will initialize thread stack
+ *
+ * @param tentry the entry of thread
+ * @param parameter the parameter of entry
+ * @param stack_addr the beginning stack address
+ * @param texit the function will be called when thread exit
+ *
+ * @return stack address
+ */
+rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter,
+ rt_uint8_t *stack_addr, void *texit)
+{
+ rt_uint16_t *pstk16;
+ rt_uint16_t flag;
+
+
+ flag = 0x0040;
+ pstk16 = (rt_uint16_t *)stack_addr;
+ pstk16--;
+
+ /* Simulate ISR entry */
+ *pstk16-- = (flag & 0x00FF) /* ... The lowest byte of the FLAG register */
+ | (((rt_uint32_t)tentry >> 8) & 0x00000F00) /* ... The highest nibble of the PC register */
+ | ((flag << 4) & 0xF000); /* ... The highest nibble of the FLAG register */
+ *pstk16-- = (((rt_uint32_t)tentry ) & 0x0000FFFF); /* ... The lowest bytes of the PC register */
+
+ /* Save registers onto stack frame */
+ *pstk16-- = (rt_uint16_t)0xFBFB; /* ... FB register */
+ *pstk16-- = (rt_uint16_t)0x3B3B; /* ... SB register */
+ *pstk16-- = (rt_uint16_t)0xA1A1; /* ... A1 register */
+ *pstk16-- = (rt_uint16_t)0xA0A0; /* ... A0 register */
+ *pstk16-- = (rt_uint16_t)0x3333; /* ... R3 register */
+ *pstk16-- = (rt_uint32_t)parameter >> 16L; /* ... Pass argument in R2 register */
+ *pstk16-- = (rt_uint32_t)parameter & 0x0000FFFFL; /* ... Pass argument in R1 register */
+ *pstk16 = (rt_uint16_t)0x0000; /* ... R0 register */
+
+ /* return task's current stack address */
+ return (rt_uint8_t *)pstk16;
+}
|