patch-2.4.10 linux/arch/mips/lib/memcpy.S

• Lines: 44
• Date: Sun Sep 9 10:43:01 2001
• Orig file: v2.4.9/linux/arch/mips/lib/memcpy.S
• Orig date: Tue Dec 5 23:15:12 2000

diff -u --recursive --new-file v2.4.9/linux/arch/mips/lib/memcpy.S linux/arch/mips/lib/memcpy.S
@@ -402,16 +402,20 @@
 
 	.align	5
 LEAF(memmove)
-	sltu	t0, a0, a1			# dst < src -> memcpy
-	bnez	t0, memcpy
-	 addu	v0, a0, a2
-	sltu	t0, v0, a1			# dst + len < src -> non-
-	bnez	t0, __memcpy			# overlapping, can use memcpy
+	addu	t0, a0, a2
+	sltu	t0, a1, t0			# dst + len <= src -> memcpy
+	addu	t1, a1, a2
+	sltu	t1, a0, t1			# dst >= src + len -> memcpy
+	and	t0, t1
+	beqz	t0, __memcpy
 	 move	v0, a0				/* return value */
 	beqz	a2, r_out
 	END(memmove)
 
 LEAF(__rmemcpy)					/* a0=dst a1=src a2=len */
+	sltu	t0, a1, a0
+	beqz	t0, r_end_bytes_up		# src >= dst
+	 nop
 	addu	a0, a2				# dst = dst + len
 	addu	a1, a2				# src = src + len
 
@@ -563,6 +567,17 @@
 	 subu	a0, a0, 0x1
 
 r_out:
+	jr	ra
+	 move	a2, zero
+
+r_end_bytes_up:
+	lb	t0, (a1)
+	subu	a2, a2, 0x1
+	sb	t0, (a0)
+	addu	a1, a1, 0x1
+	bnez	a2, r_end_bytes_up
+	 addu	a0, a0, 0x1
+
 	jr	ra
 	 move	a2, zero