// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2019 Facebook */
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#include <stdint.h>
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#include <stdbool.h>
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#include <linux/ptrace.h>
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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/* non-existing BPF helper, to test dead code elimination */
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static int (*bpf_missing_helper)(const void *arg1, int arg2) = (void *) 999;
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extern int LINUX_KERNEL_VERSION __kconfig;
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extern bool CONFIG_BPF_SYSCALL __kconfig; /* strong */
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extern enum libbpf_tristate CONFIG_TRISTATE __kconfig __weak;
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extern bool CONFIG_BOOL __kconfig __weak;
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extern char CONFIG_CHAR __kconfig __weak;
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extern uint16_t CONFIG_USHORT __kconfig __weak;
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extern int CONFIG_INT __kconfig __weak;
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extern uint64_t CONFIG_ULONG __kconfig __weak;
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extern const char CONFIG_STR[8] __kconfig __weak;
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extern uint64_t CONFIG_MISSING __kconfig __weak;
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uint64_t kern_ver = -1;
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uint64_t bpf_syscall = -1;
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uint64_t tristate_val = -1;
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uint64_t bool_val = -1;
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uint64_t char_val = -1;
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uint64_t ushort_val = -1;
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uint64_t int_val = -1;
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uint64_t ulong_val = -1;
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char str_val[8] = {-1, -1, -1, -1, -1, -1, -1, -1};
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uint64_t missing_val = -1;
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SEC("raw_tp/sys_enter")
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int handle_sys_enter(struct pt_regs *ctx)
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{
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int i;
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kern_ver = LINUX_KERNEL_VERSION;
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bpf_syscall = CONFIG_BPF_SYSCALL;
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tristate_val = CONFIG_TRISTATE;
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bool_val = CONFIG_BOOL;
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char_val = CONFIG_CHAR;
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ushort_val = CONFIG_USHORT;
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int_val = CONFIG_INT;
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ulong_val = CONFIG_ULONG;
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for (i = 0; i < sizeof(CONFIG_STR); i++) {
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str_val[i] = CONFIG_STR[i];
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}
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if (CONFIG_MISSING)
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/* invalid, but dead code - never executed */
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missing_val = bpf_missing_helper(ctx, 123);
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else
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missing_val = 0xDEADC0DE;
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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