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| author | David S. Miller <davem@davemloft.net> | 2014-04-30 12:57:51 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-05-01 16:21:03 -0400 |
| commit | 6427ccf5a004a70d8308bdadc46c7da3ac43932c (patch) | |
| tree | c667ee8dc52a0b649a4ccbf5a0666983cfaffd75 | |
| parent | e9586e58a55ea2a22b899bbb3adb5364f4b6596b (diff) | |
| download | glibc-6427ccf5a004a70d8308bdadc46c7da3ac43932c.tar.gz glibc-6427ccf5a004a70d8308bdadc46c7da3ac43932c.tar.xz glibc-6427ccf5a004a70d8308bdadc46c7da3ac43932c.zip | |
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.
| -rw-r--r-- | ChangeLog | 10 | ||||
| -rw-r--r-- | string/test-strcmp.c | 28 | ||||
| -rw-r--r-- | sysdeps/sparc/sparc64/strcmp.S | 31 |
3 files changed, 69 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index fa1ebb4601..38c96450f7 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,13 @@ +2014-05-01 David S. Miller <davem@davemloft.net> + + [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. + 2014-01-29 H.J. Lu <hongjiu.lu@intel.com> [BZ #16510] diff --git a/string/test-strcmp.c b/string/test-strcmp.c index 000c51091c..0fb41316b4 100644 --- a/string/test-strcmp.c +++ b/string/test-strcmp.c @@ -348,6 +348,34 @@ check (void) FOR_EACH_IMPL (impl, 0) check_result (impl, s1 + i1, s2 + i2, exp_result); } + + /* Test cases where there are multiple zero bytes after the first. */ + + for (size_t i = 0; i < 16 + 1; i++) + { + s1[i] = 0x00; + s2[i] = 0x00; + } + + for (size_t i = 0; i < 16; i++) + { + int exp_result; + + for (int val = 0x01; val < 0x100; val++) + { + for (size_t j = 0; j < i; j++) + { + s1[j] = val; + s2[j] = val; + } + + s2[i] = val; + + exp_result = SIMPLE_STRCMP (s1, s2); + FOR_EACH_IMPL (impl, 0) + check_result (impl, s1, s2, exp_result); + } + } } diff --git a/sysdeps/sparc/sparc64/strcmp.S b/sysdeps/sparc/sparc64/strcmp.S index 386e0abc60..4abf86f297 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 |