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| author | Jeffrey Walton <noloader@gmail.com> | 2017-09-19 21:08:37 -0400 |
|---|---|---|
| committer | Jeffrey Walton <noloader@gmail.com> | 2017-09-19 21:08:37 -0400 |
| commit | 6102333fc3c1c73c8c5b05e7cd568ac681741c9d (patch) | |
| tree | 1a54b40f518230ac1727380ea431b85cf7d87495 /gcm-simd.cpp | |
| parent | 6440921723695913cfcfffdf2c59f0cf01e59c89 (diff) | |
| download | cryptopp-git-6102333fc3c1c73c8c5b05e7cd568ac681741c9d.tar.gz | |
Add CRYPTOPP_NO_CPU_FEATURE_PROBES (GH #511)
We determine machine capabilities by performing an os/platform *query* first, like getauxv(). If the *query* fails, we move onto a cpu *probe*. The cpu *probe* tries to exeute an instruction and then catches a SIGILL on Linux or the exception EXCEPTION_ILLEGAL_INSTRUCTION on Windows. Some OSes fail to hangle a SIGILL gracefully, like Apple OSes. Apple machines corrupt memory and variables around the probe.
Diffstat (limited to 'gcm-simd.cpp')
| -rw-r--r-- | gcm-simd.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/gcm-simd.cpp b/gcm-simd.cpp index d7a23b05..66e18404 100644 --- a/gcm-simd.cpp +++ b/gcm-simd.cpp @@ -198,7 +198,9 @@ extern "C" { #if (CRYPTOPP_BOOL_ARM32 || CRYPTOPP_BOOL_ARM64)
bool CPU_ProbePMULL()
{
-#if (CRYPTOPP_ARM_PMULL_AVAILABLE)
+#if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)
+ return false;
+#elif (CRYPTOPP_ARM_PMULL_AVAILABLE)
# if defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY)
volatile bool result = true;
__try
|