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authorIan Lance Taylor <iant@golang.org>2018-09-24 21:46:21 +0000
committerIan Lance Taylor <ian@gcc.gnu.org>2018-09-24 21:46:21 +0000
commitdd931d9b48647e898dc80927c532ae93cc09e192 (patch)
tree71be2295cd79b8a182f6130611658db8628772d5 /libgo/runtime/runtime_c.c
parent779d8a5ad09b01428726ea5a0e6c87bd9ac3c0e4 (diff)
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libgo: update to Go 1.11
Reviewed-on: https://go-review.googlesource.com/136435 gotools/: * Makefile.am (mostlyclean-local): Run chmod on check-go-dir to make sure it is writable. (check-go-tools): Likewise. (check-vet): Copy internal/objabi to check-vet-dir. * Makefile.in: Rebuild. From-SVN: r264546
Diffstat (limited to 'libgo/runtime/runtime_c.c')
-rw-r--r--libgo/runtime/runtime_c.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/libgo/runtime/runtime_c.c b/libgo/runtime/runtime_c.c
index c65a7e0..6d77af4 100644
--- a/libgo/runtime/runtime_c.c
+++ b/libgo/runtime/runtime_c.c
@@ -33,6 +33,17 @@ runtime_atoi(const byte *p, intgo len)
return n;
}
+// A random number from the GNU/Linux auxv array.
+static uint32 randomNumber;
+
+// Set the random number from Go code.
+
+void
+setRandomNumber(uint32 r)
+{
+ randomNumber = r;
+}
+
#if defined(__i386__) || defined(__x86_64__) || defined (__s390__) || defined (__s390x__)
// When cputicks is just asm instructions, skip the split stack
@@ -85,8 +96,8 @@ runtime_cputicks(void)
#else
// Currently cputicks() is used in blocking profiler and to seed runtime·fastrand().
// runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
- // TODO: need more entropy to better seed fastrand.
- return runtime_nanotime();
+ // randomNumber provides better seeding of fastrand.
+ return runtime_nanotime() + randomNumber;
#endif
}
@@ -193,7 +204,6 @@ runtime_cpuinit()
}
}
if (__get_cpuid(1, &eax, &ebx, &ecx, &edx)) {
- setCpuidECX(ecx);
#if defined(__i386__)
if ((edx & bit_SSE2) != 0) {
hasSSE2 = true;