1 files changed, 68 insertions, 0 deletions
diff --git a/libpdbg/target.c b/libpdbg/target.c
new file mode 100644
index 0000000..97641ee
--- /dev/null
+++ b/libpdbg/target.c
@@ -0,0 +1,68 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <assert.h>
+#include <ccan/list/list.h>
+
+#include "target.h"
+
+void target_init(struct target *target, const char *name, uint64_t base,
+		 target_read read, target_write write,
+		 target_destroy destroy, struct target *next)
+{
+	target->name = name;
+	target->index = -1;
+	target->base = base;
+	target->read = read;
+	target->write = write;
+	target->destroy = destroy;
+	target->next = next;
+
+	list_head_init(&target->children);
+
+	if (next)
+		list_add_tail(&next->children, &target->link);
+}
+
+void target_del(struct target *target)
+{
+	if (target->destroy)
+		target->destroy(target);
+
+	/* We don't recursively destroy things yet */
+	assert(list_empty(&target->children));
+	if (target->next)
+		list_del(&target->link);
+}
+
+int read_target(struct target *target, uint64_t addr, uint64_t *value)
+{
+//	printf("Target %s read 0x%0llx\n", target->name, addr);
+
+	if (target->read)
+		return target->read(target, addr, value);
+	else
+		/* If there is no read method fall through to the next one */
+		return read_next_target(target, addr, value);
+}
+
+int read_next_target(struct target *target, uint64_t addr, uint64_t *value)
+{
+	assert(target->next);
+	return read_target(target->next, target->base + addr, value);
+}
+
+int write_target(struct target *target, uint64_t addr, uint64_t value)
+{
+//	printf("Target %s write 0x%0llx\n", target->name, addr);
+
+	if (target->write)
+		return target->write(target, addr, value);
+	else
+		return write_next_target(target, addr, value);
+}
+
+int write_next_target(struct target *target, uint64_t addr, uint64_t value)
+{
+	assert(target->next);
+	return write_target(target->next, target->base + addr, value);
+}