Add tool to extract ELF Auxiliary vectors for HWCAPs

1 files changed, 32 insertions, 0 deletions

diff --git a/tools/auxv-dump.c b/tools/auxv-dump.c
new file mode 100644
index 0000000..a15e5c1
--- /dev/null
+++ b/tools/auxv-dump.c
@@ -0,0 +1,32 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <sys/auxv.h>
+#include <errno.h>
+#include <dlfcn.h>
+
+#include <cpuinfo.h>
+
+
+typedef unsigned long (*getauxval_function_t)(unsigned long);
+
+int main(int argc, char** argv) {
+	void* libc = dlopen("libc.so", RTLD_NOW);
+	if (libc == NULL) {
+		fprintf(stderr, "Error: failed to load libc.so: %s\n", dlerror());
+		exit(EXIT_FAILURE);
+	}
+
+	getauxval_function_t getauxval = (getauxval_function_t) dlsym(libc, "getauxval");
+	if (getauxval == NULL) {
+		fprintf(stderr, "Error: failed to locate getauxval in libc.so: %s", dlerror());
+		exit(EXIT_FAILURE);
+	}
+
+	printf("AT_HWCAP = 0x%08lX\n", getauxval(AT_HWCAP));
+	#if CPUINFO_ARCH_ARM
+		printf("AT_HWCAP2 = 0x%08lX\n", getauxval(AT_HWCAP2));
+	#endif
+
+	return 0;
+}