tests/tcg: Add the syscall catchpoint gdbstub test

Check that adding/removing syscall catchpoints works.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20240202152506.279476-6-iii@linux.ibm.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240207163812.3231697-15-alex.bennee@linaro.org>

tests/tcg/multiarch/Makefile.target

@@ -108,13 +108,21 @@ run-gdbstub-prot-none: prot-none
 		--bin $< --test $(MULTIARCH_SRC)/gdbstub/prot-none.py, \
 	accessing PROT_NONE memory)
 
+run-gdbstub-catch-syscalls: catch-syscalls
+	$(call run-test, $@, $(GDB_SCRIPT) \
+		--gdb $(GDB) \
+		--qemu $(QEMU) --qargs "$(QEMU_OPTS)" \
+		--bin $< --test $(MULTIARCH_SRC)/gdbstub/catch-syscalls.py, \
+	hitting a syscall catchpoint)
+
 else
 run-gdbstub-%:
 	$(call skip-test, "gdbstub test $*", "need working gdb with $(patsubst -%,,$(TARGET_NAME)) support")
 endif
 EXTRA_RUNS += run-gdbstub-sha1 run-gdbstub-qxfer-auxv-read \
 	      run-gdbstub-proc-mappings run-gdbstub-thread-breakpoint \
-	      run-gdbstub-registers run-gdbstub-prot-none
+	      run-gdbstub-registers run-gdbstub-prot-none \
+	      run-gdbstub-catch-syscalls
 
 # ARM Compatible Semi Hosting Tests
 #

tests/tcg/multiarch/catch-syscalls.c

@@ -0,0 +1,51 @@
+/*
+ * Test GDB syscall catchpoints.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#define _GNU_SOURCE
+#include <stdlib.h>
+#include <unistd.h>
+
+const char *catch_syscalls_state = "start";
+
+void end_of_main(void)
+{
+}
+
+int main(void)
+{
+    int ret = EXIT_FAILURE;
+    char c0 = 'A', c1;
+    int fd[2];
+
+    catch_syscalls_state = "pipe2";
+    if (pipe2(fd, 0)) {
+        goto out;
+    }
+
+    catch_syscalls_state = "write";
+    if (write(fd[1], &c0, sizeof(c0)) != sizeof(c0)) {
+        goto out_close;
+    }
+
+    catch_syscalls_state = "read";
+    if (read(fd[0], &c1, sizeof(c1)) != sizeof(c1)) {
+        goto out_close;
+    }
+
+    catch_syscalls_state = "check";
+    if (c0 == c1) {
+        ret = EXIT_SUCCESS;
+    }
+
+out_close:
+    catch_syscalls_state = "close";
+    close(fd[0]);
+    close(fd[1]);
+
+out:
+    catch_syscalls_state = "end";
+    end_of_main();
+    return ret;
+}

tests/tcg/multiarch/gdbstub/catch-syscalls.py

@@ -0,0 +1,53 @@
+"""Test GDB syscall catchpoints.
+
+SPDX-License-Identifier: GPL-2.0-or-later
+"""
+from test_gdbstub import main, report
+
+
+def check_state(expected):
+    """Check the catch_syscalls_state value"""
+    actual = gdb.parse_and_eval("catch_syscalls_state").string()
+    report(actual == expected, "{} == {}".format(actual, expected))
+
+
+def run_test():
+    """Run through the tests one by one"""
+    gdb.Breakpoint("main")
+    gdb.execute("continue")
+
+    # Check that GDB stops for pipe2/read calls/returns, but not for write.
+    gdb.execute("delete")
+    try:
+        gdb.execute("catch syscall pipe2 read")
+    except gdb.error as exc:
+        exc_str = str(exc)
+        if "not supported on this architecture" in exc_str:
+            print("SKIP: {}".format(exc_str))
+            return
+        raise
+    for _ in range(2):
+        gdb.execute("continue")
+        check_state("pipe2")
+    for _ in range(2):
+        gdb.execute("continue")
+        check_state("read")
+
+    # Check that deletion works.
+    gdb.execute("delete")
+    gdb.Breakpoint("end_of_main")
+    gdb.execute("continue")
+    check_state("end")
+
+    # Check that catch-all works (libc should at least call exit).
+    gdb.execute("delete")
+    gdb.execute("catch syscall")
+    gdb.execute("continue")
+    gdb.execute("delete")
+    gdb.execute("continue")
+
+    exitcode = int(gdb.parse_and_eval("$_exitcode"))
+    report(exitcode == 0, "{} == 0".format(exitcode))
+
+
+main(run_test)