intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 29 insertions, 0 deletions

diff --git a/contrib/restricted/aws/aws-c-common/source/arch/intel/asm/cpuid.c b/contrib/restricted/aws/aws-c-common/source/arch/intel/asm/cpuid.c
new file mode 100644
index 00000000000..d2ceab01060
--- /dev/null
+++ b/contrib/restricted/aws/aws-c-common/source/arch/intel/asm/cpuid.c
@@ -0,0 +1,29 @@
+/**
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+
+#include <aws/common/cpuid.h>
+
+void aws_run_cpuid(uint32_t eax, uint32_t ecx, uint32_t *abcd) {
+    uint32_t ebx = 0;
+    uint32_t edx = 0;
+
+#if defined(__i386__) && defined(__PIC__)
+    /* in case of PIC under 32-bit EBX cannot be clobbered */
+    __asm__ __volatile__("movl %%ebx, %%edi \n\t "
+                         "cpuid \n\t "
+                         "xchgl %%ebx, %%edi"
+                         : "=D"(ebx),
+#else
+    __asm__ __volatile__("cpuid"
+                         : "+b"(ebx),
+#endif
+                           "+a"(eax),
+                           "+c"(ecx),
+                           "=d"(edx));
+    abcd[0] = eax;
+    abcd[1] = ebx;
+    abcd[2] = ecx;
+    abcd[3] = edx;
+}