diff options
Diffstat (limited to 'libcpu/mips/pic32/stack.c')
| -rw-r--r-- | libcpu/mips/pic32/stack.c | 53 |
1 files changed, 52 insertions, 1 deletions
diff --git a/libcpu/mips/pic32/stack.c b/libcpu/mips/pic32/stack.c index 61cc88d51d..f7510ce4ce 100644 --- a/libcpu/mips/pic32/stack.c +++ b/libcpu/mips/pic32/stack.c @@ -15,10 +15,20 @@ #include <rtthread.h>
/**
- * @addtogroup Loogonson SoC3210
+ * @addtogroup PIC32
*/
/*@{*/
+rt_uint32_t __attribute__((nomips16)) _get_gp(void)
+{
+ rt_uint32_t result;
+
+ // get the gp reg
+ asm volatile("move %0, $28" : "=r"(result));
+
+ return result;
+}
+
/**
* This function will initialize thread stack
*
@@ -33,6 +43,47 @@ rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, rt_uint8_t *stack_ad {
rt_uint32_t *stk;
+ /** Start at stack top */
+ stk = (rt_uint32_t *)stack_addr;
+ *(stk) = (rt_uint32_t) tentry; /* pc: Entry Point */
+ *(--stk) = (rt_uint32_t) 0x00800000; /* c0_cause: IV=1, */
+ *(--stk) = (rt_uint32_t) 0; /* c0_badvaddr */
+ *(--stk) = (rt_uint32_t) 0; /* lo */
+ *(--stk) = (rt_uint32_t) 0; /* hi */
+ *(--stk) = (rt_uint32_t) 1; /* C0_SR: IE = En, */
+ *(--stk) = (rt_uint32_t) texit; /* 31 ra */
+ *(--stk) = (rt_uint32_t) 0x0000001e; /* 30 s8 */
+ *(--stk) = (rt_uint32_t) stack_addr; /* 29 sp */
+ *(--stk) = (rt_uint32_t) _get_gp(); /* 28 gp */
+ *(--stk) = (rt_uint32_t) 0x0000001b; /* 27 k1 */
+ *(--stk) = (rt_uint32_t) 0x0000001a; /* 26 k0 */
+ *(--stk) = (rt_uint32_t) 0x00000019; /* 25 t9 */
+ *(--stk) = (rt_uint32_t) 0x00000018; /* 24 t8 */
+ *(--stk) = (rt_uint32_t) 0x00000017; /* 23 s7 */
+ *(--stk) = (rt_uint32_t) 0x00000016; /* 22 s6 */
+ *(--stk) = (rt_uint32_t) 0x00000015; /* 21 s5 */
+ *(--stk) = (rt_uint32_t) 0x00000014; /* 20 s4 */
+ *(--stk) = (rt_uint32_t) 0x00000013; /* 19 s3 */
+ *(--stk) = (rt_uint32_t) 0x00000012; /* 18 s2 */
+ *(--stk) = (rt_uint32_t) 0x00000011; /* 17 s1 */
+ *(--stk) = (rt_uint32_t) 0x00000010; /* 16 s0 */
+ *(--stk) = (rt_uint32_t) 0x0000000f; /* 15 t7 */
+ *(--stk) = (rt_uint32_t) 0x0000000e; /* 14 t6 */
+ *(--stk) = (rt_uint32_t) 0x0000000d; /* 13 t5 */
+ *(--stk) = (rt_uint32_t) 0x0000000c; /* 12 t4 */
+ *(--stk) = (rt_uint32_t) 0x0000000b; /* 11 t3 */
+ *(--stk) = (rt_uint32_t) 0x0000000a; /* 10 t2 */
+ *(--stk) = (rt_uint32_t) 0x00000009; /* 9 t1 */
+ *(--stk) = (rt_uint32_t) 0x00000008; /* 8 t0 */
+ *(--stk) = (rt_uint32_t) 0x00000007; /* 7 a3 */
+ *(--stk) = (rt_uint32_t) 0x00000006; /* 6 a2 */
+ *(--stk) = (rt_uint32_t) 0x00000005; /* 5 a1 */
+ *(--stk) = (rt_uint32_t) parameter; /* 4 a0 */
+ *(--stk) = (rt_uint32_t) 0x00000003; /* 3 v1 */
+ *(--stk) = (rt_uint32_t) 0x00000002; /* 2 v0 */
+ *(--stk) = (rt_uint32_t) 0x00000001; /* 1 at */
+ *(--stk) = (rt_uint32_t) 0x00000000; /* 0 zero */
+
/* return task's current stack address */
return (rt_uint8_t *)stk;
}
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