target: require working area for physical/virtual addresses to be specified

Fixed bug: if virtual address for working memory was not specified
and MMU was enabled, then address 0 would be used.

Require working address to be specified for both MMU enabled
and disabled case.

For some completely inexplicable reason this fixes the regression
in svn 2646 for flash write in arm926ejs target. The logs showed
that MMU was disabled in the case below:

https://lists.berlios.de/pipermail/openocd-development/2009-November/011882.html

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

2 files changed, 29 insertions, 9 deletions

diff --git a/src/target/target.c b/src/target/target.c
index 99b3d183..9289d37b 100644
--- a/src/target/target.c
+++ b/src/target/target.c
@@ -1045,13 +1045,29 @@ int target_alloc_working_area(struct target_s *target, uint32_t size, working_ar
 		{
 			return retval;
 		}
+
 		if (enabled)
 		{
-			target->working_area = target->working_area_virt;
-		}
-		else
+			if (target->working_area_phys_spec)
+			{
+				LOG_DEBUG("MMU disabled, using physical address for working memory 0x%08x", (unsigned)target->working_area_phys);
+				target->working_area = target->working_area_phys;
+			} else
+			{
+				LOG_ERROR("No working memory available. Specify -work-area-phys to target.");
+				return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+			}
+		} else
 		{
-			target->working_area = target->working_area_phys;
+			if (target->working_area_virt_spec)
+			{
+				LOG_DEBUG("MMU enabled, using virtual address for working memory 0x%08x", (unsigned)target->working_area_virt);
+				target->working_area = target->working_area_virt;
+			} else
+			{
+				LOG_ERROR("No working memory available. Specify -work-area-virt to target.");
+				return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+			}
 		}
 	}
 
@@ -1080,8 +1096,6 @@ int target_alloc_working_area(struct target_s *target, uint32_t size, working_ar
 		uint32_t first_free = target->working_area;
 		uint32_t free_size = target->working_area_size;
 
-		LOG_DEBUG("allocating new working area");
-
 		c = target->working_areas;
 		while (c)
 		{
@@ -1098,6 +1112,8 @@ int target_alloc_working_area(struct target_s *target, uint32_t size, working_ar
 			return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 		}
 
+		LOG_DEBUG("allocated new working area at address 0x%08x", (unsigned)first_free);
+
 		new_wa = malloc(sizeof(working_area_t));
 		new_wa->next = NULL;
 		new_wa->size = size;
@@ -3763,6 +3779,7 @@ static int target_configure(Jim_GetOptInfo *goi, target_t *target)
 					return e;
 				}
 				target->working_area_virt = w;
+				target->working_area_virt_spec = true;
 			} else {
 				if (goi->argc != 0) {
 					goto no_params;
@@ -3780,6 +3797,7 @@ static int target_configure(Jim_GetOptInfo *goi, target_t *target)
 					return e;
 				}
 				target->working_area_phys = w;
+				target->working_area_phys_spec = true;
 			} else {
 				if (goi->argc != 0) {
 					goto no_params;
diff --git a/src/target/target.h b/src/target/target.h
index ef578378..c971f18b 100644
--- a/src/target/target.h
+++ b/src/target/target.h
@@ -128,9 +128,11 @@ typedef struct target_s
 	int reset_halt;						/* attempt resetting the CPU into the halted mode? */
 	uint32_t working_area;					/* working area (initialized RAM). Evaluated
 										 * upon first allocation from virtual/physical address. */
-	uint32_t working_area_virt;				/* virtual address */
-	uint32_t working_area_phys;				/* physical address */
-	uint32_t working_area_size;				/* size in bytes */
+	bool working_area_virt_spec;		/* virtual address specified? */
+	uint32_t working_area_virt;			/* virtual address */
+	bool working_area_phys_spec;		/* virtual address specified? */
+	uint32_t working_area_phys;			/* physical address */
+	uint32_t working_area_size;			/* size in bytes */
 	uint32_t backup_working_area;			/* whether the content of the working area has to be preserved */
 	struct working_area_s *working_areas;/* list of allocated working areas */
 	enum target_debug_reason debug_reason;/* reason why the target entered debug state */