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-rw-r--r--src/random.cpp10
1 files changed, 8 insertions, 2 deletions
diff --git a/src/random.cpp b/src/random.cpp
index 7916643263..67efc7d945 100644
--- a/src/random.cpp
+++ b/src/random.cpp
@@ -72,10 +72,16 @@ static bool rdrand_supported = false;
static constexpr uint32_t CPUID_F1_ECX_RDRAND = 0x40000000;
static void RDRandInit()
{
- //! When calling cpuid function #1, ecx register will have this set if RDRAND is available.
+ uint32_t eax, ecx, edx;
+#if defined(__i386__) && ( defined(__PIC__) || defined(__PIE__))
// Avoid clobbering ebx, as that is used for PIC on x86.
- uint32_t eax, tmp, ecx, edx;
+ uint32_t tmp;
__asm__ ("mov %%ebx, %1; cpuid; mov %1, %%ebx": "=a"(eax), "=g"(tmp), "=c"(ecx), "=d"(edx) : "a"(1));
+#else
+ uint32_t ebx;
+ __asm__ ("cpuid": "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx) : "a"(1));
+#endif
+ //! When calling cpuid function #1, ecx register will have this set if RDRAND is available.
if (ecx & CPUID_F1_ECX_RDRAND) {
LogPrintf("Using RdRand as entropy source\n");
rdrand_supported = true;