[libcpu][arm] fix: correct FPU stack initialization sequence and alignment for Cortex-A

Xenithya · Xenithya · commit d074a7e48994 · 2025-11-10T09:35:09.000+08:00
diff --git a/libcpu/arm/cortex-a/stack.c b/libcpu/arm/cortex-a/stack.c
@@ -31,7 +31,9 @@ rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter,
                              rt_uint8_t *stack_addr, void *texit)
 {
     rt_uint32_t *stk;
+#ifdef RT_USING_FPU
     rt_uint32_t i;
+#endif
 
     stack_addr += sizeof(rt_uint32_t);
     stack_addr  = (rt_uint8_t *)RT_ALIGN_DOWN((rt_uint32_t)stack_addr, 8);

Original file line number	Diff line number	Diff line change
`@@ -31,7 +31,9 @@ rt_uint8_t rt_hw_stack_init(void tentry, void *parameter,`
`31`	`31`	`rt_uint8_t stack_addr, void texit)`
`32`	`32`	`{`
`33`	`33`	`rt_uint32_t *stk;`
	`34`	`+#ifdef RT_USING_FPU`
`34`	`35`	`rt_uint32_t i;`
	`36`	`+#endif`
`35`	`37`
`36`	`38`	`stack_addr += sizeof(rt_uint32_t);`
`37`	`39`	`stack_addr = (rt_uint8_t *)RT_ALIGN_DOWN((rt_uint32_t)stack_addr, 8);`