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From 2fd1041a8d9684978546886d58fdf8add8c8d9f7 Mon Sep 17 00:00:00 2001
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From: Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com>
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Date: Tue, 5 Jul 2016 21:20:41 +0530
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Subject: [PATCH] powerpc: Fix return code of strcasecmp for unaligned inputs
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If the input values are unaligned and if there are null characters in the
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memory before the starting address of the input values, strcasecmp
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gives incorrect return code. Fixed it by adding mask the bits that
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are not part of the string.
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(cherry picked from commit 30e4cc5413f72c2c728a544389da0c48500d9904)
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---
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ChangeLog | 6 ++++++
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sysdeps/powerpc/powerpc64/power8/strcasecmp.S | 17 ++++++++++++++---
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2 files changed, 20 insertions(+), 3 deletions(-)
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diff --git a/ChangeLog b/ChangeLog
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index 9385bd0..af5f694 100644
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diff --git a/sysdeps/powerpc/powerpc64/power8/strcasecmp.S b/sysdeps/powerpc/powerpc64/power8/strcasecmp.S
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index 63f6217..c83dc52 100644
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--- a/sysdeps/powerpc/powerpc64/power8/strcasecmp.S
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+++ b/sysdeps/powerpc/powerpc64/power8/strcasecmp.S
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@@ -40,11 +40,20 @@
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vsel v5, v7, v5, v8; \
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vcmpequb. v7, v5, v4;
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-/* Get 16 bytes for unaligned case. */
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+/*
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+ * Get 16 bytes for unaligned case.
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+ * reg1: Vector to hold next 16 bytes.
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+ * reg2: Address to read from.
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+ * reg3: Permute control vector.
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+ * v8: Tmp vector used to mask unwanted bytes.
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+ * v9: Tmp vector,0 when null is found on first 16 bytes
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+ */
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#ifdef __LITTLE_ENDIAN__
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#define GET16BYTES(reg1, reg2, reg3) \
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lvx reg1, 0, reg2; \
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- vcmpequb. v8, v0, reg1; \
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+ vspltisb v8, -1; \
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+ vperm v8, v8, reg1, reg3; \
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+ vcmpequb. v8, v0, v8; \
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beq cr6, 1f; \
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vspltisb v9, 0; \
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b 2f; \
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@@ -57,7 +66,9 @@
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#else
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#define GET16BYTES(reg1, reg2, reg3) \
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lvx reg1, 0, reg2; \
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- vcmpequb. v8, v0, reg1; \
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+ vspltisb v8, -1; \
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+ vperm v8, reg1, v8, reg3; \
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+ vcmpequb. v8, v0, v8; \
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beq cr6, 1f; \
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vspltisb v9, 0; \
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b 2f; \
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--
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2.1.0
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