[cpu arm_common profiling]

* some fixes and more documentation

cpu/arm_common/profiling.c

@@ -3,8 +3,8 @@
 #include <cpu.h>
 #include <ltc4150.h>
 
-#define MAX_TRACED_FUNCTIONS    (32)
-#define PROFILING_STACK_SIZE    (16)
+#define MAX_TRACED_FUNCTIONS    (256)
+#define PROFILING_STACK_SIZE    (256)
 
 typedef struct {
     uint32_t address;
@@ -16,14 +16,15 @@ typedef struct {
 } profiling_info_t;
 
 static profiling_info_t functions[MAX_TRACED_FUNCTIONS];
-static uint8_t profiling_stack[PROFILING_STACK_SIZE];
-static uint8_t profiling_sp = 0;
+static uint16_t profiling_stack[PROFILING_STACK_SIZE];
+static uint16_t profiling_sp = 0;
+static uint8_t function_pending = 0;
 
-static uint8_t traced_functions = 0;
+static uint16_t traced_functions = 0;
 static uint8_t profiling = 0;
 
 void __attribute__((__no_instrument_function__)) profiling_init(void) {
-    uint8_t i;
+    uint16_t i;
     for (i = 0; i < MAX_TRACED_FUNCTIONS; i++) {
         functions[i].address = 0;
         functions[i].time = 0;
@@ -40,7 +41,7 @@ void __attribute__((__no_instrument_function__)) profiling_init(void) {
 }
 
 static int16_t __attribute__((__no_instrument_function__)) get_function_index(uint32_t addr) {
-    uint8_t i;
+    uint16_t i;
     for (i = 0; i < MAX_TRACED_FUNCTIONS; i++) {
         if (functions[i].address == addr) {
             return i;
@@ -54,13 +55,28 @@ void __attribute__((__no_instrument_function__))  __cyg_profile_func_enter (void
         return;
     }
     int16_t idx = get_function_index((uint32_t) func);
+    /* if function is not yet on traced */
     if ((idx < 0) && (traced_functions < MAX_TRACED_FUNCTIONS)) {
         idx = traced_functions++;
         functions[idx].address = (uint32_t) func;
     }
+    /* maximu of traceable functions reached */
     else if (idx < 0) {
         return;
     }
+
+    /* check if a profiled function is pending */
+    if (function_pending && (profiling_stack[profiling_sp] != idx)) {
+        functions[idx].time += T0TC - functions[idx].start_time;
+        //functions[idx].consumption += ltc4150_get_intcount() - functions[idx].consumption_start;
+        functions[idx].consumption += ltc4150_get_total_mAh() - functions[idx].consumption_start;
+    }
+
+    /* push current function on profile stack */
+    profiling_sp++;
+    profiling_stack[profiling_sp] = idx;
+
+    /* save stats for current function */
     functions[idx].start_time = T0TC;
     functions[idx].counter++;
     functions[idx].consumption_start = ltc4150_get_total_mAh();
@@ -77,10 +93,19 @@ void __attribute__((__no_instrument_function__)) __cyg_profile_func_exit (void *
         //functions[idx].consumption += ltc4150_get_intcount() - functions[idx].consumption_start;
         functions[idx].consumption += ltc4150_get_total_mAh() - functions[idx].consumption_start;
     }
+    /* reset pending flag */
+    function_pending = 0;
+    /* if another function is pending */
+    if (profiling_sp) {
+        if (--profiling_sp) {
+            functions[profiling_stack[profiling_sp]].start_time = T0TC;
+            functions[profiling_stack[profiling_sp]].consumption_start = ltc4150_get_total_mAh();
+        }
+    }
 }
 
 void profiling_stats(void) {
-    uint8_t i;
+    uint16_t i;
     for (i = 0; i < traced_functions; i++) {
 //            printf("Function @%04lX was running %u times for %lu ticks, consuming %li ltc-ticks\n", functions[i].address, functions[i].counter, functions[i].time, functions[i].consumption);
             printf("Function @%04lX was running %u times for %lu ticks, consuming %lf mAh\n", functions[i].address, functions[i].counter, functions[i].time, functions[i].consumption);