Merge pull request #1968 from RT-Thread/feature_stack_grows

[Kernel] Add ARCH_CPU_STACK_GROWS_UPWARD option

Author: BernardXiong

components/finsh/cmd.c

@@ -101,16 +101,28 @@ static long _list_thread(struct rt_list_node *list)
         else if (stat == RT_THREAD_INIT)    rt_kprintf(" init   ");
         else if (stat == RT_THREAD_CLOSE)   rt_kprintf(" close  ");
 
+#if defined(ARCH_CPU_STACK_GROWS_UPWARD)
+        ptr = (rt_uint8_t *)thread->stack_addr + thread->stack_size;
+        while (*ptr == '#')ptr --;
+
+        rt_kprintf(" 0x%08x 0x%08x    %02d%%   0x%08x %03d\n",
+                   ((rt_uint32_t)thread->sp - (rt_uint32_t)thread->stack_addr),
+                   thread->stack_size,
+                   ((rt_uint32_t)ptr - (rt_uint32_t)thread->stack_addr) * 100 / thread->stack_size,
+                   thread->remaining_tick,
+                   thread->error);
+#else
         ptr = (rt_uint8_t *)thread->stack_addr;
         while (*ptr == '#')ptr ++;
 
         rt_kprintf(" 0x%08x 0x%08x    %02d%%   0x%08x %03d\n",
-                   thread->stack_size + ((rt_uint32_t)thread->stack_addr - (rt_uint32_t)thread->sp),
+                   (thread->stack_size + (rt_uint32_t)thread->stack_addr - (rt_uint32_t)thread->sp),
                    thread->stack_size,
-                   (thread->stack_size - ((rt_uint32_t) ptr - (rt_uint32_t) thread->stack_addr)) * 100
+                   (thread->stack_size + (rt_uint32_t)thread->stack_addr - (rt_uint32_t) ptr) * 100
                         / thread->stack_size,
                    thread->remaining_tick,
                    thread->error);
+#endif
     }
 
     return 0;

libcpu/Kconfig

@@ -88,3 +88,7 @@ config ARCH_IA32
 
 config ARCH_HOST_SIMULATOR
     bool
+
+config ARCH_CPU_STACK_GROWS_UPWARD
+    bool
+    default n

src/scheduler.c

@@ -91,11 +91,19 @@ static void _rt_scheduler_stack_check(struct rt_thread *thread)
         level = rt_hw_interrupt_disable();
         while (level);
     }
+#if defined(ARCH_CPU_STACK_GROWS_UPWARD)
+    else if ((rt_uint32_t)thread->sp > ((rt_uint32_t)thread->stack_addr + thread->stack_size))
+    {
+        rt_kprintf("warning: %s stack is close to the top of stack address.\n",
+                   thread->name);
+    }
+#else
     else if ((rt_uint32_t)thread->sp <= ((rt_uint32_t)thread->stack_addr + 32))
     {
-        rt_kprintf("warning: %s stack is close to end of stack address.\n",
+        rt_kprintf("warning: %s stack is close to the bottom of stack address.\n",
                    thread->name);
     }
+#endif
 }
 #endif
 

src/thread.c

@@ -136,9 +136,15 @@ static rt_err_t _rt_thread_init(struct rt_thread *thread,
 
     /* init thread stack */
     rt_memset(thread->stack_addr, '#', thread->stack_size);
+#ifdef ARCH_CPU_STACK_GROWS_UPWARD
+    thread->sp = (void *)rt_hw_stack_init(thread->entry, thread->parameter,
+                                          (void *)((char *)thread->stack_addr),
+                                          (void *)rt_thread_exit);
+#else
     thread->sp = (void *)rt_hw_stack_init(thread->entry, thread->parameter,
                                           (void *)((char *)thread->stack_addr + thread->stack_size - 4),
                                           (void *)rt_thread_exit);
+#endif
 
     /* priority init */
     RT_ASSERT(priority < RT_THREAD_PRIORITY_MAX);