jtag: make caller always allocate buffer

simplifies the API and there is only one remaining user at this point.

Is the implementation busted where the check does not actually happen
now?

Change-Id: I776a43766f5576a08df320f6fe41a2750d101bde
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
Reviewed-on: http://openocd.zylin.com/264


Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

src/jtag/core.c

@@ -417,12 +417,8 @@ static void jtag_add_scan_check(struct jtag_tap *active, void (*jtag_add_scan)(s
 	for (int i = 0; i < in_num_fields; i++)
 	{
 		struct scan_field *field = &in_fields[i];
-		field->allocated = 0;
-		field->modified = 0;
-		if (field->check_value || field->in_value)
-			continue;
-		interface_jtag_add_scan_check_alloc(field);
-		field->modified = 1;
+		/* caller must provide in_buffer if needed for callback */
+		assert((field->check_value == NULL) || (field->in_value != NULL));
 	}
 
 	jtag_add_scan(active, in_num_fields, in_fields, state);
@@ -437,14 +433,6 @@ static void jtag_add_scan_check(struct jtag_tap *active, void (*jtag_add_scan)(s
 				(jtag_callback_data_t)in_fields[i].check_mask,
 				(jtag_callback_data_t)in_fields[i].num_bits);
 		}
-		if (in_fields[i].allocated)
-		{
-			free(in_fields[i].in_value);
-		}
-		if (in_fields[i].modified)
-		{
-			in_fields[i].in_value = NULL;
-		}
 	}
 }
 

src/jtag/jtag.h

@@ -105,8 +105,6 @@ extern tap_state_t cmd_queue_cur_state;
  *
  * In addition, this structure includes a value and mask that is used by
  * jtag_add_dr_scan_check() to validate the value that was scanned out.
- *
- * The allocated, modified, and intmp fields are internal work space.
  */
 struct scan_field {
 	/// The number of bits this field specifies (up to 32)
@@ -120,13 +118,6 @@ struct scan_field {
 	uint8_t* check_value;
 	/// The mask to go with check_value
 	uint8_t* check_mask;
-
-	/// in_value has been allocated for the queue
-	int allocated;
-	/// Indicates we modified the in_value.
-	int modified;
-	/// temporary storage for performing value checks synchronously
-	uint8_t intmp[4];
 };
 
 struct jtag_tap {

src/jtag/minidriver/minidriver_imp.h

@@ -23,24 +23,6 @@
 
 #include <jtag/jtag_minidriver.h>
 
-static inline void interface_jtag_alloc_in_value32(struct scan_field *field)
-{
-	field->in_value = field->intmp;
-}
-
-static inline void interface_jtag_add_scan_check_alloc(struct scan_field *field)
-{
-	/* We're executing this synchronously, so try to use local storage. */
-	if (field->num_bits > 32)
-	{
-		unsigned num_bytes = DIV_ROUND_UP(field->num_bits, 8);
-		field->in_value = (uint8_t *)malloc(num_bytes);
-		field->allocated = 1;
-	}
-	else
-		field->in_value = field->intmp;
-}
-
 static inline void jtag_add_dr_out(struct jtag_tap* tap,
 		int num_fields, const int* num_bits, const uint32_t* value,
 		tap_state_t end_state)