From: Ilya Leoshkevich <iii@linux.ibm.com>
Add a small test in order to prevent regressions.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20220314104232.675863-4-iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
tests/tcg/s390x/Makefile.target | 1 +
tests/tcg/s390x/branch-relative-long.c | 68 ++++++++++++++++++++++++++
2 files changed, 69 insertions(+)
create mode 100644 tests/tcg/s390x/branch-relative-long.c
diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.target
index 7aa502a557..f0d474a245 100644
--- a/tests/tcg/s390x/Makefile.target
+++ b/tests/tcg/s390x/Makefile.target
@@ -15,6 +15,7 @@ TESTS+=mvc
TESTS+=shift
TESTS+=trap
TESTS+=signals-s390x
+TESTS+=branch-relative-long
ifneq ($(HAVE_GDB_BIN),)
GDB_SCRIPT=$(SRC_PATH)/tests/guest-debug/run-test.py
diff --git a/tests/tcg/s390x/branch-relative-long.c b/tests/tcg/s390x/branch-relative-long.c
new file mode 100644
index 0000000000..94219afcad
--- /dev/null
+++ b/tests/tcg/s390x/branch-relative-long.c
@@ -0,0 +1,68 @@
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/mman.h>
+
+#define DEFINE_ASM(_name, _code) \
+ extern const char _name[]; \
+ extern const char _name ## _end[]; \
+ asm(" .globl " #_name "\n" \
+ #_name ":\n" \
+ " " _code "\n" \
+ " .globl " #_name "_end\n" \
+ #_name "_end:\n");
+
+DEFINE_ASM(br_r14, "br %r14");
+DEFINE_ASM(brasl_r0, "brasl %r0,.-0x100000000");
+DEFINE_ASM(brcl_0xf, "brcl 0xf,.-0x100000000");
+
+struct test {
+ const char *code;
+ const char *code_end;
+};
+
+static const struct test tests[] = {
+ {
+ .code = brasl_r0,
+ .code_end = brasl_r0_end,
+ },
+ {
+ .code = brcl_0xf,
+ .code_end = brcl_0xf_end,
+ },
+};
+
+int main(void)
+{
+ unsigned char *buf;
+ size_t length = 0;
+ size_t i;
+
+ for (i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) {
+ size_t test_length = 0x100000000 + (tests[i].code_end - tests[i].code);
+
+ if (test_length > length) {
+ length = test_length;
+ }
+ }
+
+ buf = mmap(NULL, length, PROT_READ | PROT_WRITE | PROT_EXEC,
+ MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0);
+ if (buf == MAP_FAILED) {
+ perror("SKIP: mmap() failed");
+ return 0;
+ }
+
+ memcpy(buf, br_r14, br_r14_end - br_r14);
+ for (i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) {
+ void (*code)(void) = (void *)(buf + 0x100000000);
+
+ memcpy(code, tests[i].code, tests[i].code_end - tests[i].code);
+ code();
+ memset(code, 0, tests[i].code_end - tests[i].code);
+ }
+
+ munmap(buf, length);
+
+ return 0;
+}
--
2.27.0