1 files changed, 69 insertions, 0 deletions
diff --git a/unix/utils/arm_arch_queries.h b/unix/utils/arm_arch_queries.h
new file mode 100644
index 00000000..fa46c622
--- /dev/null
+++ b/unix/utils/arm_arch_queries.h
@@ -0,0 +1,69 @@
+/*
+ * Header included only by arm_arch_queries.c.
+ *
+ * The only reason this is a header file instead of a source file is
+ * so that I can define 'static inline' functions which may or may not
+ * be used, without provoking a compiler warning when I turn out not
+ * to use them in the subsequent source file.
+ */
+
+#ifndef PUTTY_ARM_ARCH_QUERIES_H
+#define PUTTY_ARM_ARCH_QUERIES_H
+
+#if defined __APPLE__
+#if HAVE_SYS_SYSCTL_H
+#include <sys/sysctl.h>
+#endif
+#endif /* defined __APPLE__ */
+
+#if defined __arm__ || defined __aarch64__
+
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#if HAVE_SYS_AUXV_H
+#include <sys/auxv.h>
+#endif
+
+#if HAVE_ASM_HWCAP_H
+#include <asm/hwcap.h>
+#endif
+
+#if HAVE_GETAUXVAL
+/* No code needed: getauxval has just the API we want already */
+#elif HAVE_ELF_AUX_INFO
+/* Implement the simple getauxval API in terms of FreeBSD elf_aux_info */
+static inline u_long getauxval(int which)
+{
+    u_long toret;
+    if (elf_aux_info(which, &toret, sizeof(toret)) != 0)
+        return 0;                      /* elf_aux_info didn't work */
+    return toret;
+}
+#else
+/* Implement a stub getauxval which returns no capabilities */
+static inline u_long getauxval(int which) { return 0; }
+#endif
+
+#endif /* defined __arm__ || defined __aarch64__ */
+
+#if defined __APPLE__
+typedef enum { SYSCTL_MISSING, SYSCTL_OFF, SYSCTL_ON } SysctlResult;
+
+static inline SysctlResult test_sysctl_flag(const char *flagname)
+{
+#if HAVE_SYSCTLBYNAME
+    int value;
+    size_t size = sizeof(value);
+    if (sysctlbyname(flagname, &value, &size, NULL, 0) == 0 &&
+        size == sizeof(value)) {
+        return value != 0 ? SYSCTL_ON : SYSCTL_OFF;
+    }
+#else /* HAVE_SYSCTLBYNAME */
+    return SYSCTL_MISSING;
+#endif /* HAVE_SYSCTLBYNAME */
+}
+#endif /* defined __APPLE__ */
+
+#endif /* PUTTY_ARM_ARCH_QUERIES_H */