From 3f1e17f9803faeab79f6dbf000b4855ba7bc894f Mon Sep 17 00:00:00 2001
From: Mike Pavone <pavone@retrodev.com>
Date: Sat, 4 May 2013 16:23:28 -0700
Subject: Implement HALT (sort of tested)

---
 zruntime.S | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'zruntime.S')

diff --git a/zruntime.S b/zruntime.S
index 8b74b1b..c2ffe19 100644
--- a/zruntime.S
+++ b/zruntime.S
@@ -71,6 +71,17 @@ z80_do_sync:
 zskip_sync:
 	ret
 
+	.global z80_halt
+z80_halt:
+	mov %edi, %r14d
+	sub %ebp, %r14d
+	and $0xFFFFFFFC, %r14d
+	add %r14d, %ebp
+	cmp %edi, %ebp
+	jnb z80_handle_cycle_limit_int
+	add $4, %ebp
+	jmp z80_handle_cycle_limit_int
+
 	.global z80_read_byte
 z80_read_byte:
 	call z_inccycles
-- 
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