From 46404513a49d1b3ef4203f4309bf3752eb0c3f35 Mon Sep 17 00:00:00 2001
From: Christian Kosman <christiankosman@gmail.com>
Date: Thu, 1 Oct 2020 21:06:18 -0700
Subject: Account for forward-looped memmove

---
 libpsn00b/libc/memmove.s | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/libpsn00b/libc/memmove.s b/libpsn00b/libc/memmove.s
index d32e2ca..843ece7 100644
--- a/libpsn00b/libc/memmove.s
+++ b/libpsn00b/libc/memmove.s
@@ -10,20 +10,33 @@
 .type memmove, @function
 memmove:
 	move	$v0, $a0
+	sltu	$v1, $a0, $a1
+	blez	$v1, .Linit_backward
+.Lloop_forward:
+	blez	$a2, .Lexit
+	addi	$a2, -1
+	lbu		$v1, 0($a1)
+	addiu	$a1, 1
+	sb		$v1, 0($a0)
+	addiu	$a0, 1
+	b		.Lloop_forward
+	nop
+.Linit_backward:
 	addu	$a0, $a2
 	addu	$a1, $a2
 	addiu	$a0, -1
 	addiu	$a1, -1
-.Lloop:
+	b		.Lloop_backward
+	nop
+.Lloop_backward:
 	blez	$a2, .Lexit
 	addi	$a2, -1
 	lbu		$v1, 0($a1)
 	addiu	$a1, -1
 	sb		$v1, 0($a0)
 	addiu	$a0, -1
-	b		.Lloop
+	b		.Lloop_backward
 	nop
 .Lexit:
 	jr		$ra
-	nop
-	
\ No newline at end of file
+	nop
\ No newline at end of file
-- 
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