- check cortex_m3 FPB is enabled when setting hardware breakpoint

- Thanks Igor Skochinsky

git-svn-id: svn://svn.berlios.de/openocd/trunk@1231 b42882b7-edfa-0310-969c-e2dbd0fdcd60

src/target/cortex_m3.c

@@ -225,6 +225,7 @@ int cortex_m3_endreset_event(target_t *target)
 
 	/* Enable FPB */
 	target_write_u32(target, FP_CTRL, 3);
+	cortex_m3->fpb_enabled = 1;
 
 	/* Restore FPB registers */
 	for (i = 0; i < cortex_m3->fp_num_code + cortex_m3->fp_num_lit; i++)
@@ -869,6 +870,11 @@ int cortex_m3_set_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 		comparator_list[fp_num].fpcr_value = (breakpoint->address & 0x1FFFFFFC) | hilo | 1;
 		target_write_u32(target, comparator_list[fp_num].fpcr_address, comparator_list[fp_num].fpcr_value);
 		LOG_DEBUG("fpc_num %i fpcr_value 0x%x", fp_num, comparator_list[fp_num].fpcr_value);
+		if (!cortex_m3->fpb_enabled)
+		{
+			LOG_DEBUG("FPB wasn't enabled, do it now");
+			target_write_u32(target, FP_CTRL, 3);
+		}
 	}
 	else if (breakpoint->type == BKPT_SOFT)
 	{
@@ -1401,10 +1407,11 @@ int cortex_m3_examine(struct target_s *target)
 		/* Setup FPB */
 		target_read_u32(target, FP_CTRL, &fpcr);
 		cortex_m3->auto_bp_type = 1;
-		cortex_m3->fp_num_code = (fpcr >> 4) & 0xF;
+		cortex_m3->fp_num_code = (fpcr >> 8) & 0x70 | (fpcr >> 4) & 0xF; /* bits [14:12] and [7:4] */
 		cortex_m3->fp_num_lit = (fpcr >> 8) & 0xF;
 		cortex_m3->fp_code_available = cortex_m3->fp_num_code;
 		cortex_m3->fp_comparator_list = calloc(cortex_m3->fp_num_code + cortex_m3->fp_num_lit, sizeof(cortex_m3_fp_comparator_t));
+		cortex_m3->fpb_enabled = fpcr & 1;
 		for (i = 0; i < cortex_m3->fp_num_code + cortex_m3->fp_num_lit; i++)
 		{
 			cortex_m3->fp_comparator_list[i].type = (i < cortex_m3->fp_num_code) ? FPCR_CODE : FPCR_LITERAL;

src/target/cortex_m3.h

@@ -145,14 +145,15 @@ typedef struct cortex_m3_common_s
 	u32 nvic_dfsr;  /* Debug Fault Status Register - shows reason for debug halt */
 	u32 nvic_icsr;  /* Interrupt Control State Register - shows active and pending IRQ */
 	
-	/* Flash Patch and Breakpoint */
+	/* Flash Patch and Breakpoint (FPB) */
 	int fp_num_lit;
 	int fp_num_code;
 	int fp_code_available;
+	int fpb_enabled;
 	int auto_bp_type;
 	cortex_m3_fp_comparator_t *fp_comparator_list;
 	
-	/* DWT */
+	/* Data Watchpoint and Trace (DWT) */
 	int dwt_num_comp;
 	int dwt_comp_available;
 	cortex_m3_dwt_comparator_t *dwt_comparator_list;