Fix c5471 signal handling + deallocation bug

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@44 42af7a65-404d-4744-a932-0658087f49c3

arch/c5471/defconfig

@@ -40,11 +40,13 @@
 # CONFIG_ROM_VECTORS - unique to c5471
 # CONFIG_DRAM_END - the size of installed DRAM.
 #   Unique to c5471
+# CONFIG_C5471_LEDS - Use LEDs to show state. Unique to c5471.
 #
 CONFIG_ARCH=c5471
 CONFIG_ARCH_C5471=y
 CONFIG_ROM_VECTORS=n
 CONFIG_DRAM_END=0x11000000
+CONFIG_C5471_LEDS=y
 
 #
 # C5471 specific device driver settings

arch/c5471/src/up_assert.c

@@ -58,6 +58,64 @@
  * Private Functions
  ************************************************************/
 
+/************************************************************
+ * Name: up_getsp
+ ************************************************************/
+
+/* I don't know if the builtin to get SP is enabled */
+
+static inline uint32 up_getsp(void)
+{
+  uint32 sp;
+  __asm__
+  (
+    "\tmov %0, sp\n\t"
+    : "=r"(sp)
+  );
+  return sp;
+}
+
+/************************************************************
+ * Name: up_stackdump
+ ************************************************************/
+
+#ifdef CONFIG_C5471_STACKDUMP
+static void up_stackdump(void)
+{
+  _TCB *rtcb        = (_TCB*)g_readytorun.head;
+  uint32 stack_base = (uint32)rtcb->adj_stack_ptr;
+  uint32 sp         = up_getsp();
+
+  lldbg("stack_base: %08x\n", stack_base);
+  lldbg("stack_size: %08x\n", rtcb->adj_stack_size);
+  lldbg("sp:         %08x\n", sp);
+
+  if (sp >= stack_base || sp < stack_base - rtcb->adj_stack_size)
+    {
+      lldbg("ERROR: Stack pointer is not within allocated stack\n");
+      return;
+    }
+  else
+    {
+      uint32 stack = sp & ~0x1f;
+
+      for (stack = sp & ~0x1f; stack < stack_base; stack += 32)
+        {
+          uint32 *ptr = (uint32*)stack;
+          lldbg("%08x: %08x %08x %08x %08x %08x %08x %08x %08x\n",
+                 stack, ptr[0], ptr[1], ptr[2], ptr[3],
+                 ptr[4], ptr[5], ptr[6], ptr[7]);
+        }
+    }
+}
+#else
+# define up_stackdump()
+#endif
+
+/************************************************************
+ * Name: _up_assert
+ ************************************************************/
+
 static void _up_assert(int errorcode) /* __attribute__ ((noreturn)) */
 {
   /* Are we in an interrupt handler or the idle task? */
@@ -91,9 +149,19 @@ static void _up_assert(int errorcode) /* __attribute__ ((noreturn)) */
 
 void up_assert(const ubyte *filename, int lineno)
 {
+#if CONFIG_TASK_NAME_SIZE > 0
+  _TCB *rtcb = (_TCB*)g_readytorun.head;
+#endif
+
   up_ledon(LED_ASSERTION);
+#if CONFIG_TASK_NAME_SIZE > 0
+  dbg("Assertion failed at file:%s line: %d task: %s\n",
+        filename, lineno, rtcb->name);
+#else
   dbg("Assertion failed at file:%s line: %d\n",
         filename, lineno);
+#endif
+  up_stackdump();
   _up_assert(EXIT_FAILURE);
 }
 
@@ -103,8 +171,18 @@ void up_assert(const ubyte *filename, int lineno)
 
 void up_assert_code(const ubyte *filename, int lineno, int errorcode)
 {
+#if CONFIG_TASK_NAME_SIZE > 0
+  _TCB *rtcb = (_TCB*)g_readytorun.head;
+#endif
+
   up_ledon(LED_ASSERTION);
+#if CONFIG_TASK_NAME_SIZE > 0
+  dbg("Assertion failed at file:%s line: %d task: %s error code: %d\n",
+        filename, lineno, rtcb->name, errorcode);
+#else
   dbg("Assertion failed at file:%s line: %d error code: %d\n",
         filename, lineno, errorcode);
+#endif
+  up_stackdump();
   _up_assert(errorcode);
 }

arch/c5471/src/up_internal.h

@@ -44,13 +44,16 @@
  * Definitions
  ************************************************************/
 
-/* Bring-up debug configurations */
+/* Bring-up debug configurations.  These are here (vs defconfig)
+ * because these should only be controlled during low level
+ * board bring-up and not part of normal platform configuration.
+ */
 
 #define CONFIG_SUPPRESS_INTERRUPTS  1 /* Do not enable interrupts */
 #undef  CONFIG_SUPPRESS_UART_CONFIG   /* Do not reconfig UART */
-#define CONFIG_C5471_LEDS           1 /* Use LEDs to show state */
+#define CONFIG_C5471_STACKDUMP      1 /* Dump stack on assertion */
 
-/* LED meanings */
+/* LED definitions */
 
 #define LED_STARTED                 0
 #define LED_HEAPALLOCATE            1

arch/c5471/src/up_schedulesigaction.c

@@ -99,6 +99,8 @@ void up_schedule_sigaction(_TCB *tcb, sig_deliver_t sigdeliver)
 {
   /* Refuse to handle nested signal actions */
 
+  dbg("tcb=0x%p sigdeliver=0x%p\n", tcb, sigdeliver);
+
   if (!tcb->xcp.sigdeliver)
     {
       irqstate_t flags;
@@ -111,6 +113,8 @@ void up_schedule_sigaction(_TCB *tcb, sig_deliver_t sigdeliver)
        * being delivered to the currently executing task.
        */
 
+      dbg("rtcb=0x%p current_regs=0x%p\n", g_readytorun.head, current_regs);
+
       if (tcb == (_TCB*)g_readytorun.head)
         {
           /* CASE 1:  We are not in an interrupt handler and

arch/c5471/src/up_serial.c

@@ -589,14 +589,13 @@ static void up_xmitchars(up_dev_t *dev)
 static void up_putxmitchar(up_dev_t *dev, int ch)
 {
   int nexthead = dev->xmit.head + 1;
+  if (nexthead >= dev->xmit.size)
+    {
+      nexthead = 0;
+    }
 
   for(;;)
     {
-      if (nexthead >= dev->xmit.size)
-        {
-          nexthead = 0;
-        }
-
       if (nexthead != dev->xmit.tail)
         {
           dev->xmit.buffer[dev->xmit.head] = ch;

arch/c5471/src/up_sigdeliver.c

@@ -81,7 +81,10 @@ void up_sigdeliver(void)
   sig_deliver_t sigdeliver;
 
   up_ledon(LED_SIGNAL);
-  ASSERT(rtcb->xcp.sigdeliver);
+
+  dbg("rtcb=%p sigdeliver=%p sigpendactionq.head=%p\n",
+       rtcb, rtcb->xcp.sigdeliver, rtcb->sigpendactionq.head);
+  ASSERT(rtcb->xcp.sigdeliver != NULL);
 
   /* Save the real return state on the stack. */
 
@@ -99,12 +102,9 @@ void up_sigdeliver(void)
   sigdeliver           = rtcb->xcp.sigdeliver;
   rtcb->xcp.sigdeliver = NULL;
 
-  /* Then enable interrupts.  We should still be safe from
-   * any further signal handling actions until we also
-   * nullify tcb->xcp.sigdeliver.
-   */
+  /* Then restore the task interrupt statat. */
 
-  irqrestore(SVC_MODE | F_BIT);
+  irqrestore(regs[REG_CPSR]);
 
   /* Deliver the signals */
 
@@ -115,5 +115,6 @@ void up_sigdeliver(void)
    */
 
   up_ledoff(LED_SIGNAL);
+  dbg("Resuming\n");
   up_fullcontextrestore(regs);
 }

examples/ostest/main.c

@@ -204,7 +204,7 @@ int user_start(int parm1, int parm2, int parm3, int parm4)
     }
   else
     {
-       printf("user_start: Started user_main at PID=%d\n", result);
+      printf("user_start: Started user_main at PID=%d\n", result);
     }
 
   return 0;

fs/fs_files.c

@@ -141,7 +141,7 @@ int files_releaselist(FAR struct filelist *list)
        /* Decrement the reference count */
 
        _files_semtake(list);
-       crefs = --list->fl_crefs;
+       crefs = --(list->fl_crefs);
        _files_semgive(list);
 
        /* If the count decrements to zero, then there is no reference

mm/mm_free.c

@@ -68,6 +68,8 @@ void free(FAR void *mem)
   FAR struct mm_freenode_s *prev;
   FAR struct mm_freenode_s *next;
 
+  vdbg("Freeing %p\n", mem);
+
   /* Protect against attempts to free a NULL reference */
 
   if (!mem)

mm/mm_initialize.c

@@ -165,6 +165,8 @@ void mm_addregion(FAR void *heapstart, size_t heapsize)
   heapend  = MM_ALIGN_DOWN((size_t)heapstart + (size_t)heapsize);
   heapsize = heapend - heapbase;
 
+  lldbg("Region %d: base=%p size=%d\n", IDX+1, heapstart, heapsize);
+
   /* Add the size of this region to the total size of the heap */
 
   g_heapsize += heapsize;

mm/mm_malloc.c

@@ -199,5 +199,6 @@ FAR void *malloc(size_t size)
     }
 
   mm_givesemaphore();
+  vdbg("Allocated %p\n", ret);
   return ret;
 }

sched/sig_deliver.c

@@ -132,7 +132,7 @@ void sig_deliver(FAR _TCB *stcb)
 
       rpid = getpid();
 
-      /* Deliver the signal using its address environment */
+      /* Deliver the signal */
 
       (*sigq->action.sighandler)(sigq->info.si_signo, &sigq->info, NULL);