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-rw-r--r--tools/testing/selftests/bpf/progs/test_core_extern.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_core_extern.c b/tools/testing/selftests/bpf/progs/test_core_extern.c
new file mode 100644
index 000000000000..3ac3603ad53d
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_core_extern.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2019 Facebook */
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <linux/ptrace.h>
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+
+/* non-existing BPF helper, to test dead code elimination */
+static int (*bpf_missing_helper)(const void *arg1, int arg2) = (void *) 999;
+
+extern int LINUX_KERNEL_VERSION __kconfig;
+extern bool CONFIG_BPF_SYSCALL __kconfig; /* strong */
+extern enum libbpf_tristate CONFIG_TRISTATE __kconfig __weak;
+extern bool CONFIG_BOOL __kconfig __weak;
+extern char CONFIG_CHAR __kconfig __weak;
+extern uint16_t CONFIG_USHORT __kconfig __weak;
+extern int CONFIG_INT __kconfig __weak;
+extern uint64_t CONFIG_ULONG __kconfig __weak;
+extern const char CONFIG_STR[8] __kconfig __weak;
+extern uint64_t CONFIG_MISSING __kconfig __weak;
+
+uint64_t kern_ver = -1;
+uint64_t bpf_syscall = -1;
+uint64_t tristate_val = -1;
+uint64_t bool_val = -1;
+uint64_t char_val = -1;
+uint64_t ushort_val = -1;
+uint64_t int_val = -1;
+uint64_t ulong_val = -1;
+char str_val[8] = {-1, -1, -1, -1, -1, -1, -1, -1};
+uint64_t missing_val = -1;
+
+SEC("raw_tp/sys_enter")
+int handle_sys_enter(struct pt_regs *ctx)
+{
+ int i;
+
+ kern_ver = LINUX_KERNEL_VERSION;
+ bpf_syscall = CONFIG_BPF_SYSCALL;
+ tristate_val = CONFIG_TRISTATE;
+ bool_val = CONFIG_BOOL;
+ char_val = CONFIG_CHAR;
+ ushort_val = CONFIG_USHORT;
+ int_val = CONFIG_INT;
+ ulong_val = CONFIG_ULONG;
+
+ for (i = 0; i < sizeof(CONFIG_STR); i++) {
+ str_val[i] = CONFIG_STR[i];
+ }
+
+ if (CONFIG_MISSING)
+ /* invalid, but dead code - never executed */
+ missing_val = bpf_missing_helper(ctx, 123);
+ else
+ missing_val = 0xDEADC0DE;
+
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";