test: add ARM at travis-ci

Added ARM architecture for testing release and
debug Tarantool builds on Travis-ci.

Close #4270

.gitlab-ci.yml

@@ -90,6 +90,14 @@ release_asan_clang8:
   script:
     - ${GITLAB_MAKE} test_asan_debian_no_deps
 
+release_arm:
+  <<: *deploy_definition
+  variables:
+    DOCKER_IMAGE: "${CI_REGISTRY}/${CI_PROJECT_PATH}/testing/arm64v8-debian-buster:latest"
+    CMAKE_EXTRA_PARAMS: -DENABLE_BACKTRACE=OFF
+  script:
+    - ${GITLAB_MAKE} test_arm_debian_no_deps
+
 osx_13_release:
   <<: *release_only_definition
   <<: *vbox_definition

.travis.mk

@@ -123,6 +123,17 @@ test_asan_debian_no_deps: build_asan_debian
 
 test_asan_debian: deps_debian deps_buster_clang_8 test_asan_debian_no_deps
 
+#######
+# ARM #
+#######
+
+qemu_arm_debian:
+	docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+
+build_arm_debian: qemu_arm_debian docker_build_debian
+
+test_arm_debian_no_deps: qemu_arm_debian docker_test_debian_no_deps
+
 #######
 # OSX #
 #######

src/lib/core/fiber.c

@@ -43,7 +43,22 @@
 #include "trigger.h"
 
 #if ENABLE_FIBER_TOP
+#if !defined(__arm__) && !defined(__aarch64__) && !defined(__powerpc64__) && !defined(__PPC64__) && \
+    !defined(__powerpc__)
 #include <x86intrin.h> /* __rdtscp() */
+#elif defined(__aarch64__)
+static __inline__ unsigned long long __rdtscp(uint32_t *cpu_id)
+{
+       // System timer of ARMv8 runs at a different frequency than the CPU's.
+       // The frequency is fixed, typically in the range 1-50MHz.  It can be
+       // read at CNTFRQ special register.  We assume the OS has set up
+       // the virtual timer properly.
+       if (!cpu_id) { cpu_id = 0; }
+       int64_t virtual_timer_value;
+       __asm__ volatile("mrs %0, cntvct_el0" : "=r"(virtual_timer_value));
+       return virtual_timer_value;
+}
+#endif
 
 static inline void
 clock_stat_add_delta(struct clock_stat *stat, uint64_t clock_delta)
@@ -109,7 +124,7 @@ cpu_stat_reset(struct cpu_stat *stat)
 static uint64_t
 cpu_stat_on_csw(struct cpu_stat *stat)
 {
-	uint32_t cpu_id;
+	uint32_t cpu_id = 0;
 	uint64_t delta, clock = __rdtscp(&cpu_id);
 
 	if (cpu_id == stat->prev_cpu_id) {