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diff m68k_core.c @ 2350:f8b5142c06aa

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Allow 68K to return mid-instruction. Adjust how 68K interrupt ack works so int2 busy flag timing is more correct. Fix some other SCD timing issues
author Michael Pavone <pavone@retrodev.com>
date Mon, 16 Oct 2023 23:30:04 -0700
parents 0111c8344477
children 66b3f2eda0c8
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--- a/m68k_core.c	Fri Oct 13 22:44:36 2023 -0700
+++ b/m68k_core.c	Mon Oct 16 23:30:04 2023 -0700
@@ -1206,7 +1206,9 @@
 void resume_68k(m68k_context *context)
 {
 	code_ptr addr = context->resume_pc;
-	context->resume_pc = NULL;
+	if (!context->stack_storage_count) {
+		context->resume_pc = NULL;
+	}
 	m68k_options * options = context->options;
 	context->should_return = 0;
 	options->start_context(addr, context);
@@ -1220,6 +1222,8 @@
 		//switching from user to system mode so swap stack pointers
 		context->aregs[8] = context->aregs[7];
 	}
+	context->resume_pc = NULL;
+	context->stack_storage_count = 0;
 	context->status = 0x27;
 	context->aregs[7] = ((uint32_t)reset_vec[0]) << 16 | reset_vec[1];
 	uint32_t address = ((uint32_t)reset_vec[2]) << 16 | reset_vec[3];