Get Z80 core working for simple programs

1 files changed, 39 insertions, 0 deletions

diff --git a/x86_backend.c b/x86_backend.c
new file mode 100644
index 0000000..b03703e
--- /dev/null
+++ b/x86_backend.c
@@ -0,0 +1,39 @@
+#include "x86_backend.h"
+#include <stdlib.h>
+
+deferred_addr * defer_address(deferred_addr * old_head, uint32_t address, uint8_t *dest)
+{
+	deferred_addr * new_head = malloc(sizeof(deferred_addr));
+	new_head->next = old_head;
+	new_head->address = address & 0xFFFFFF;
+	new_head->dest = dest;
+	return new_head;
+}
+
+void process_deferred(deferred_addr ** head_ptr, void * context, native_addr_func get_native)
+{
+	deferred_addr * cur = *head_ptr;
+	deferred_addr **last_next = head_ptr;
+	while(cur)
+	{
+		uint8_t * native = get_native(context, cur->address);//get_native_address(opts->native_code_map, cur->address);
+		if (native) {
+			int32_t disp = native - (cur->dest + 4);
+			uint8_t * out = cur->dest;
+			*(out++) = disp;
+			disp >>= 8;
+			*(out++) = disp;
+			disp >>= 8;
+			*(out++) = disp;
+			disp >>= 8;
+			*out = disp;
+			*last_next = cur->next;
+			free(cur);
+			cur = *last_next;
+		} else {
+			last_next = &(cur->next);
+			cur = cur->next;
+		}
+	}
+}
+