kernel: userspace: Fix dynamic thread stack allocation for RISC-V

RISC-V use the same logic for dynamic thread stacks allocation as ARM.
This fixup reuses ARM code.

Signed-off-by: Rick Tsao <rick592@andestech.com>

Author: Rick Tsao

kernel/userspace.c

@@ -51,19 +51,19 @@ static struct k_spinlock lists_lock;       /* kobj dlist */
 static struct k_spinlock objfree_lock;     /* k_object_free */
 
 #ifdef CONFIG_GEN_PRIV_STACKS
-/* On ARM & ARC MPU we may have two different alignment requirement
+/* On ARM & ARC MPU & RISC-V PMP we may have two different alignment requirement
  * when dynamically allocating thread stacks, one for the privileged
  * stack and other for the user stack, so we need to account the
  * worst alignment scenario and reserve space for that.
  */
-#if defined(CONFIG_ARM_MPU) || defined(CONFIG_ARC_MPU)
+#if defined(CONFIG_ARM_MPU) || defined(CONFIG_ARC_MPU) || defined(CONFIG_RISCV_PMP)
 #define STACK_ELEMENT_DATA_SIZE(size) \
 	(sizeof(struct z_stack_data) + CONFIG_PRIVILEGED_STACK_SIZE + \
 	Z_THREAD_STACK_OBJ_ALIGN(size) + K_THREAD_STACK_LEN(size))
 #else
 #define STACK_ELEMENT_DATA_SIZE(size) (sizeof(struct z_stack_data) + \
 	K_THREAD_STACK_LEN(size))
-#endif /* CONFIG_ARM_MPU || CONFIG_ARC_MPU */
+#endif /* CONFIG_ARM_MPU || CONFIG_ARC_MPU || CONFIG_RISCV_PMP */
 #else
 #define STACK_ELEMENT_DATA_SIZE(size) K_THREAD_STACK_LEN(size)
 #endif /* CONFIG_GEN_PRIV_STACKS */
@@ -150,13 +150,13 @@ uint8_t *z_priv_stack_find(k_thread_stack_t *stack)
 #endif /* ARCH_DYNAMIC_OBJ_K_THREAD_ALIGNMENT */
 
 #ifdef CONFIG_DYNAMIC_THREAD_STACK_SIZE
-#ifndef CONFIG_MPU_STACK_GUARD
+#if defined(CONFIG_MPU_STACK_GUARD) || defined(CONFIG_PMP_STACK_GUARD)
 #define DYN_OBJ_DATA_ALIGN_K_THREAD_STACK \
-	Z_THREAD_STACK_OBJ_ALIGN(CONFIG_PRIVILEGED_STACK_SIZE)
+	Z_THREAD_STACK_OBJ_ALIGN(CONFIG_DYNAMIC_THREAD_STACK_SIZE)
 #else
 #define DYN_OBJ_DATA_ALIGN_K_THREAD_STACK \
-	Z_THREAD_STACK_OBJ_ALIGN(CONFIG_DYNAMIC_THREAD_STACK_SIZE)
-#endif /* !CONFIG_MPU_STACK_GUARD */
+	Z_THREAD_STACK_OBJ_ALIGN(CONFIG_PRIVILEGED_STACK_SIZE)
+#endif /* CONFIG_MPU_STACK_GUARD || CONFIG_PMP_STACK_GUARD */
 #else
 #define DYN_OBJ_DATA_ALIGN_K_THREAD_STACK \
 	Z_THREAD_STACK_OBJ_ALIGN(ARCH_STACK_PTR_ALIGN)
@@ -349,13 +349,13 @@ static struct k_object *dynamic_object_create(enum k_objects otype, size_t align
 		stack_data->priv = (uint8_t *)dyn->data;
 		stack_data->size = adjusted_size;
 		dyn->kobj.data.stack_data = stack_data;
-#if defined(CONFIG_ARM_MPU) || defined(CONFIG_ARC_MPU)
+#if defined(CONFIG_ARM_MPU) || defined(CONFIG_ARC_MPU) || defined(CONFIG_RISCV_PMP)
 		dyn->kobj.name = (void *)ROUND_UP(
 			  ((uint8_t *)dyn->data + CONFIG_PRIVILEGED_STACK_SIZE),
 			  Z_THREAD_STACK_OBJ_ALIGN(size));
 #else
 		dyn->kobj.name = dyn->data;
-#endif /* CONFIG_ARM_MPU || CONFIG_ARC_MPU */
+#endif /* CONFIG_ARM_MPU || CONFIG_ARC_MPU || CONFIG_RISCV_PMP */
 #else
 		dyn->kobj.name = dyn->data;
 		dyn->kobj.data.stack_size = adjusted_size;