implement minimalistic talloc_report(); add 't' command on UART

This helps when debugging the firmware, as it shows the current
utliization of the 10-msgb-talloc pool.

Change-Id: Ib10c4396cd4c9c4a6257cf45886e367214787927
Related: OS#4251

firmware/libboard/qmod/source/board_qmod.c

@@ -230,6 +230,7 @@ void board_exec_dbg_cmd(int ch)
 		printf("\t2\tGenerate 1ms reset pulse on WWAN2\n\r");
 		printf("\t!\tSwitch Channel A from physical -> remote\n\r");
 		printf("\t@\tSwitch Channel B from physical -> remote\n\r");
+		printf("\tt\t(pseudo)talloc report\n\r");
 		break;
 	case 'R':
 		printf("Asking NVIC to reset us\n\r");
@@ -292,6 +293,9 @@ void board_exec_dbg_cmd(int ch)
 	case '@':
 		sim_switch_use_physical(0, 0);
 		break;
+	case 't':
+		talloc_report(NULL, stdout);
+		break;
 	default:
 		if (!qmod_sam3_is_12())
 			printf("Unknown command '%c'\n\r", ch);

firmware/libcommon/include/talloc.h

@@ -17,6 +17,7 @@
 #pragma once
 
 #include <stdlib.h>
+#include <stdio.h>
 #include <stdarg.h>
 
 /* minimalistic emulation of core talloc API functions used by msgb.c */
@@ -39,3 +40,4 @@ void *talloc_named_const(const void *context, size_t size, const char *name);
 void talloc_set_name_const(const void *ptr, const char *name);
 char *talloc_strdup(const void *t, const char *p);
 void *talloc_pool(const void *context, size_t size);
+void talloc_report(const void *ptr, FILE *f);

firmware/libcommon/source/pseudo_talloc.c

@@ -15,6 +15,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA
  */
 #include <stdint.h>
+#include <stdio.h>
 
 #include "talloc.h"
 #include "trace.h"
@@ -76,6 +77,20 @@ int _talloc_free(void *ptr, const char *location)
 	return -1;
 }
 
+void talloc_report(const void *ptr, FILE *f)
+{
+	unsigned int i;
+
+	fprintf(f, "talloc_report(): ");
+	for (i = 0; i < ARRAY_SIZE(msgb_inuse); i++) {
+		if (msgb_inuse[i])
+			fputc('X', f);
+		else
+			fputc('_', f);
+	}
+	fprintf(f, "\r\n");
+}
+
 void talloc_set_name_const(const void *ptr, const char *name)
 {
 	/* do nothing */