[PATCH v6 18/22] tests/tcg/aarch64: add a gdbstub testcase for SVE registers

[Alex Bennée]

A very simple test case which sets and reads SVE registers while
running a test case. We don't really need to compile a SVE binary for
this case but we will later so keep it simple for now.

Signed-off-by: Alex Bennée <address@hidden>

---
v5
  - properly plumb in
  - skip if fails to connect
---
 tests/.gitignore                      |  1 +
 tests/tcg/aarch64/Makefile.target     | 15 +++++
 tests/tcg/aarch64/gdbstub/test-sve.py | 81 +++++++++++++++++++++++++++
 3 files changed, 97 insertions(+)
 create mode 100644 tests/tcg/aarch64/gdbstub/test-sve.py

diff --git a/tests/.gitignore b/tests/.gitignore
index 7306866f216..d03c037d772 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -10,6 +10,7 @@ qht-bench
 rcutorture
 test-*
 !test-*.c
+!test-*.py
 !docker/test-*
 test-qapi-commands.[ch]
 test-qapi-init-commands.[ch]
diff --git a/tests/tcg/aarch64/Makefile.target 
b/tests/tcg/aarch64/Makefile.target
index a25afc071cc..b61b53e4dd1 100644
--- a/tests/tcg/aarch64/Makefile.target
+++ b/tests/tcg/aarch64/Makefile.target
@@ -46,6 +46,21 @@ ifneq ($(DOCKER_IMAGE)$(CROSS_CC_HAS_SVE),)
 # System Registers Tests
 AARCH64_TESTS += sysregs
 sysregs: CFLAGS+=-march=armv8.1-a+sve
+
+ifneq ($(HAVE_GDB_BIN),)
+GDB_SCRIPT=$(SRC_PATH)/tests/guest-debug/run-test.py
+
+AARCH64_TESTS += gdbstub-sysregs
+
+.PHONY: gdbstub-sysregs
+run-gdbstub-sysregs: sysregs
+       $(call run-test, $@, $(GDB_SCRIPT) \
+               --gdb $(HAVE_GDB_BIN) \
+               --qemu $(QEMU) --qargs "$(QEMU_OPTS)" \
+               --bin $< --test $(AARCH64_SRC)/gdbstub/test-sve.py, \
+       "basic gdbstub SVE support")
+endif
+
 endif
 
 TESTS += $(AARCH64_TESTS)
diff --git a/tests/tcg/aarch64/gdbstub/test-sve.py 
b/tests/tcg/aarch64/gdbstub/test-sve.py
new file mode 100644
index 00000000000..90201d80094
--- /dev/null
+++ b/tests/tcg/aarch64/gdbstub/test-sve.py
@@ -0,0 +1,81 @@
+from __future__ import print_function
+#
+# Test the SVE registers are visable and changeable via gdbstub
+#
+# This is launched via tests/guest-debug/run-test.py
+#
+
+import gdb
+import sys
+
+MAGIC = 0xDEADBEEF
+
+failcount = 0
+
+def report(cond, msg):
+    "Report success/fail of test"
+    if cond:
+        print ("PASS: %s" % (msg))
+    else:
+        print ("FAIL: %s" % (msg))
+        global failcount
+        failcount += 1
+
+def run_test():
+    "Run through the tests one by one"
+
+    gdb.execute("info registers")
+    report(True, "info registers")
+
+    gdb.execute("info registers vector")
+    report(True, "info registers vector")
+
+    # Now all the zregs
+    frame = gdb.selected_frame()
+    for i in range(0, 32):
+        rname = "z%d" % (i)
+        zreg = frame.read_register(rname)
+        report(True, "Reading %s" % rname)
+        for j in range(0, 4):
+            cmd = "set $%s.q.u[%d] = 0x%x" % (rname, j, MAGIC)
+            gdb.execute(cmd)
+            report(True, "%s" % cmd)
+        for j in range(0, 4):
+            reg = "$%s.q.u[%d]" % (rname, j)
+            v = gdb.parse_and_eval(reg)
+            report(str(v.type) == "uint128_t", "size of %s" % (reg))
+        for j in range(0, 8):
+            cmd = "set $%s.d.u[%d] = 0x%x" % (rname, j, MAGIC)
+            gdb.execute(cmd)
+            report(True, "%s" % cmd)
+        for j in range(0, 8):
+            reg = "$%s.d.u[%d]" % (rname, j)
+            v = gdb.parse_and_eval(reg)
+            report(str(v.type) == "uint64_t", "size of %s" % (reg))
+            report(int(v) == MAGIC, "%s is 0x%x" % (reg, MAGIC))
+
+#
+# This runs as the script it sourced (via -x, via run-test.py)
+#
+try:
+    inferior = gdb.selected_inferior()
+    arch = inferior.architecture()
+    report(arch.name() == "aarch64", "connected to aarch64")
+except (gdb.error, AttributeError):
+    print("SKIPPING (not connected)", file=sys.stderr)
+    exit(0)
+
+try:
+    # These are not very useful in scripts
+    gdb.execute("set pagination off")
+    gdb.execute("set confirm off")
+
+    # Run the actual tests
+    run_test()
+except:
+    print ("GDB Exception: %s" % (sys.exc_info()[0]))
+    failcount += 1
+
+print("All tests complete: %d failures" % failcount)
+
+exit(failcount)
-- 
2.20.1