internal/cpu: add aarch64 support functions
Patch from Andreas Schwab.
Change-Id: Ie5466f7c5b2a681ce090797cc52915d93f508847
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/281000
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Peter Weinberger <pjw@google.com>
diff --git a/libgo/go/internal/cpu/cpu_gccgo.c b/libgo/go/internal/cpu/cpu_gccgo.c
index da26f4d..6a20b39 100644
--- a/libgo/go/internal/cpu/cpu_gccgo.c
+++ b/libgo/go/internal/cpu/cpu_gccgo.c
@@ -200,3 +200,29 @@
}
#endif /* defined(__s390x__) */
+
+#ifdef __aarch64__
+
+uint64_t getisar0(void)
+ __asm__(GOSYM_PREFIX "internal_1cpu.getisar0")
+ __attribute__((no_split_stack));
+
+uint64_t getisar0() {
+ uint64_t isar0;
+
+ __asm__("mrs %0,id_aa64isar0_el1" : "=r"(isar0));
+ return isar0;
+}
+
+uint64_t getMIDR(void)
+ __asm__(GOSYM_PREFIX "internal_1cpu.getMIDR")
+ __attribute__((no_split_stack));
+
+uint64_t getMIDR() {
+ uint64_t MIDR;
+
+ __asm__("mrs %0,midr_el1" : "=r"(MIDR));
+ return MIDR;
+}
+
+#endif /* defined(__aarch64__) */
