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| author | Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> | 2016-07-05 21:20:41 +0530 |
|---|---|---|
| committer | Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> | 2016-07-05 21:20:41 +0530 |
| commit | 30e4cc5413f72c2c728a544389da0c48500d9904 (patch) | |
| tree | 261f08774100bfd10af7e10ab04c49b238343f89 | |
| parent | 2918b0d0ecbf781400577d63aed7eaa4498dad91 (diff) | |
| download | glibc-30e4cc5413f72c2c728a544389da0c48500d9904.tar.gz | |
powerpc: Fix return code of strcasecmp for unaligned inputs
If the input values are unaligned and if there are null characters in the
memory before the starting address of the input values, strcasecmp
gives incorrect return code. Fixed it by adding mask the bits that
are not part of the string.
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | sysdeps/powerpc/powerpc64/power8/strcasecmp.S | 17 |
2 files changed, 20 insertions, 3 deletions
@@ -1,3 +1,9 @@ +2016-07-05 Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> + + [BZ #20327] + * sysdeps/powerpc/powerpc64/power8/strcasecmp.S: Mask bits that + are not part of the string. + 2016-07-05 Adhemerval Zanella <adhemerval.zanella@linaro.org> * nptl/tst-cancel4-common.c (do_test): Add temporary fifo creation. diff --git a/sysdeps/powerpc/powerpc64/power8/strcasecmp.S b/sysdeps/powerpc/powerpc64/power8/strcasecmp.S index 63f62171d9..c83dc524e8 100644 --- a/sysdeps/powerpc/powerpc64/power8/strcasecmp.S +++ b/sysdeps/powerpc/powerpc64/power8/strcasecmp.S @@ -40,11 +40,20 @@ vsel v5, v7, v5, v8; \ vcmpequb. v7, v5, v4; -/* Get 16 bytes for unaligned case. */ +/* + * Get 16 bytes for unaligned case. + * reg1: Vector to hold next 16 bytes. + * reg2: Address to read from. + * reg3: Permute control vector. + * v8: Tmp vector used to mask unwanted bytes. + * v9: Tmp vector,0 when null is found on first 16 bytes + */ #ifdef __LITTLE_ENDIAN__ #define GET16BYTES(reg1, reg2, reg3) \ lvx reg1, 0, reg2; \ - vcmpequb. v8, v0, reg1; \ + vspltisb v8, -1; \ + vperm v8, v8, reg1, reg3; \ + vcmpequb. v8, v0, v8; \ beq cr6, 1f; \ vspltisb v9, 0; \ b 2f; \ @@ -57,7 +66,9 @@ #else #define GET16BYTES(reg1, reg2, reg3) \ lvx reg1, 0, reg2; \ - vcmpequb. v8, v0, reg1; \ + vspltisb v8, -1; \ + vperm v8, reg1, v8, reg3; \ + vcmpequb. v8, v0, v8; \ beq cr6, 1f; \ vspltisb v9, 0; \ b 2f; \ |