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authorDavid S. Miller <davem@davemloft.net>2014-04-30 12:57:51 -0700
committerDavid S. Miller <davem@davemloft.net>2014-05-01 12:15:06 -0700
commit5331255b6eeafa74865b2e6af627cb712c41dafd (patch)
treea9d5fe7cfb4ad4af1dcb12bad7e1b158d281eca5 /sysdeps/sparc/sparc64/strcmp.S
parent4fdfe821e20a70670b3d03deb2abed5d8c83e51b (diff)
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Fix v9/64-bit strcmp when string ends in multiple zero bytes.
	[BZ #16885]
	* sysdeps/sparc/sparc64/strcmp.S: Fix end comparison handling when
	multiple zero bytes exist at the end of a string.
	Reported by Aurelien Jarno <aurelien@aurel32.net>

	* string/test-strcmp.c (check): Add explicit test for situations where
	there are multiple zero bytes after the first.
Diffstat (limited to 'sysdeps/sparc/sparc64/strcmp.S')
-rw-r--r--sysdeps/sparc/sparc64/strcmp.S31
1 files changed, 31 insertions, 0 deletions
diff --git a/sysdeps/sparc/sparc64/strcmp.S b/sysdeps/sparc/sparc64/strcmp.S
index 8925396ec6..f32b0fc779 100644
--- a/sysdeps/sparc/sparc64/strcmp.S
+++ b/sysdeps/sparc/sparc64/strcmp.S
@@ -121,6 +121,37 @@ ENTRY(strcmp)
 	movleu	%xcc, -1, %o0
 	srlx	rTMP1, 7, rTMP1
 
+	/* In order not to be influenced by bytes after the zero byte, we
+	 * have to retain only the highest bit in the mask for the comparison
+	 * with rSTRXOR to work properly.
+	 */
+	mov	0, rTMP2
+	andcc	rTMP1, 0x0100, %g0
+
+	movne	%xcc, 8, rTMP2
+	sllx	rTMP1, 63 - 16, %o1
+
+	movrlz	%o1, 16, rTMP2
+	sllx	rTMP1, 63 - 24, %o1
+
+	movrlz	%o1, 24, rTMP2
+	sllx	rTMP1, 63 - 32, %o1
+
+	movrlz	%o1, 32, rTMP2
+	sllx	rTMP1, 63 - 40, %o1
+
+	movrlz	%o1, 40, rTMP2
+	sllx	rTMP1, 63 - 48, %o1
+
+	movrlz	%o1, 48, rTMP2
+	sllx	rTMP1, 63 - 56, %o1
+
+	movrlz	%o1, 56, rTMP2
+
+	srlx	rTMP1, rTMP2, rTMP1
+
+	sllx	rTMP1, rTMP2, rTMP1
+
 	cmp	rTMP1, rSTRXOR
 	retl
 	 movgu	%xcc, 0, %o0