Merge pull request #759 from jimparis/aducrf101-fix-stack

ADuCRF101: Fix stack/heap overflow

cpu/arm/aducrf101/Common/GCC/ADuCRF101.ld

@@ -91,10 +91,8 @@ SECTIONS
         } > ram AT > flash
 
         .bss : {
-                /* Stack is in BSS */
                 . = ALIGN(8);
                 __bss_start = .;
-                *(.bss.stack)
                 *(.bss)
                 *(.bss.*)
                 *(COMMON)
@@ -102,4 +100,9 @@ SECTIONS
                 __bss_end = .;
                 end = .;
         } > ram
+
+        /* Heap grows up from "end" (after bss), and stack grows down from
+           the end of RAM. */
+        . = ORIGIN(ram) + LENGTH(ram);
+        stack_end = .;
 }

cpu/arm/aducrf101/Common/GCC/crt0.S

@@ -32,19 +32,8 @@
  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef __STACK_SIZE
-#define __STACK_SIZE 1024
-#endif
-
 .equ SCB_VTOR, 0xE000ED08
 
-/* Stack */
-        .section .bss.stack
-stack_start:
-        .space __STACK_SIZE, 0
-stack_end:
-        .global stack_end
-
 /* Vector table */
         .macro handler name
         .long \name\()

cpu/arm/aducrf101/clock.c

@@ -43,9 +43,25 @@ static volatile clock_time_t current_clock = 0;
 static volatile unsigned long current_seconds = 0;
 static unsigned int second_countdown = CLOCK_SECOND;
 
+#define SAMPLE_STACK_POINTER
+#ifdef SAMPLE_STACK_POINTER
+volatile uint32_t *__min_sampled_sp = (uint32_t *)0xFFFFFFFF;
+#endif
+
 void
 SysTick_Handler(void)
 {
+#ifdef SAMPLE_STACK_POINTER
+  /* Take note of the lowest stack pointer we ever saw.
+     When compiling against newlib, the total free bytes of
+     RAM not ever used by heap or stack can be found via GDB:
+       (gdb) p (char *)__min_sampled_sp - (char *)_sbrk(0)
+  */
+  uint32_t *sp = (uint32_t *)&sp;
+  if (sp < __min_sampled_sp)
+    __min_sampled_sp = sp;
+#endif
+
   current_clock++;
   if(etimer_pending()) {
     etimer_request_poll();

platform/ev-aducrf101mkxz/contiki-conf.h

@@ -89,11 +89,11 @@
 #define XMAC_CONF_COMPOWER                      0
 #define CXMAC_CONF_COMPOWER                     0
 
-#define COLLECT_NBR_TABLE_CONF_MAX_NEIGHBORS    32
+#define COLLECT_NBR_TABLE_CONF_MAX_NEIGHBORS    16
 
 #endif /* WITH_UIP6 */
 
-#define QUEUEBUF_CONF_NUM               16
+#define QUEUEBUF_CONF_NUM               4
 
 #define PACKETBUF_CONF_ATTRS_INLINE     1
 
@@ -109,7 +109,7 @@
 #define ENERGEST_CONF_ON                0
 
 #define AODV_COMPLIANCE
-#define AODV_NUM_RT_ENTRIES             32
+#define AODV_NUM_RT_ENTRIES             16
 
 #define WITH_ASCII                      1
 
@@ -131,8 +131,8 @@
 #define UIP_CONF_IPV6_RPL               1
 #endif
 
-#define NBR_TABLE_CONF_MAX_NEIGHBORS    30
-#define UIP_CONF_MAX_ROUTES             30
+#define NBR_TABLE_CONF_MAX_NEIGHBORS    16
+#define UIP_CONF_MAX_ROUTES             16
 
 #define UIP_CONF_ND6_SEND_RA            0
 #define UIP_CONF_ND6_REACHABLE_TIME     600000
@@ -146,7 +146,7 @@
 #define UIP_CONF_ND6_MAX_PREFIXES       3
 #define UIP_CONF_ND6_MAX_DEFROUTERS     2
 #define UIP_CONF_IP_FORWARD             0
-#define UIP_CONF_BUFFER_SIZE            140
+#define UIP_CONF_BUFFER_SIZE            240
 #define SICSLOWPAN_CONF_FRAG            1
 #define SICSLOWPAN_CONF_MAXAGE          8