Add tests for rseq(2)

Add a decent set of syscall tests for rseq(2). These are a bit awkward because
of issues with library integration. libc may register rseq on thread start
(including before main on the initial thread), precluding much testing. Thus we
run tests in a libc-free subprocess.

Support for rseq(2) in gVisor will come in a later commit.

PiperOrigin-RevId: 284595994

1 files changed, 59 insertions, 0 deletions

diff --git a/test/syscalls/linux/rseq/BUILD b/test/syscalls/linux/rseq/BUILD
new file mode 100644
index 000000000..5cfe4e56f
--- /dev/null
+++ b/test/syscalls/linux/rseq/BUILD
@@ -0,0 +1,59 @@
+# This package contains a standalone rseq test binary. This binary must not
+# depend on libc, which might use rseq itself.
+
+load("@bazel_tools//tools/cpp:cc_flags_supplier.bzl", "cc_flags_supplier")
+load("@rules_cc//cc:defs.bzl", "cc_library")
+
+package(licenses = ["notice"])
+
+genrule(
+    name = "rseq_binary",
+    srcs = [
+        "critical.h",
+        "critical.S",
+        "rseq.cc",
+        "syscalls.h",
+        "start.S",
+        "test.h",
+        "types.h",
+        "uapi.h",
+    ],
+    outs = ["rseq"],
+    cmd = " ".join([
+        "$(CC)",
+        "$(CC_FLAGS) ",
+        "-I.",
+        "-Wall",
+        "-Werror",
+        "-O2",
+        "-std=c++17",
+        "-static",
+        "-nostdlib",
+        "-ffreestanding",
+        "-o",
+        "$(location rseq)",
+        "$(location critical.S)",
+        "$(location rseq.cc)",
+        "$(location start.S)",
+    ]),
+    toolchains = [
+        ":no_pie_cc_flags",
+        "@bazel_tools//tools/cpp:current_cc_toolchain",
+    ],
+    visibility = ["//:sandbox"],
+)
+
+cc_flags_supplier(
+    name = "no_pie_cc_flags",
+    features = ["-pie"],
+)
+
+cc_library(
+    name = "lib",
+    testonly = 1,
+    hdrs = [
+        "test.h",
+        "uapi.h",
+    ],
+    visibility = ["//:sandbox"],
+)