99 lines
1.9 KiB
C
99 lines
1.9 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2019 Facebook */
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#include <stdbool.h>
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#define __read_mostly SEC(".data.read_mostly")
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struct s {
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int a;
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long long b;
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} __attribute__((packed));
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/* .data section */
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int in1 = -1;
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long long in2 = -1;
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/* .bss section */
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char in3 = '\0';
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long long in4 __attribute__((aligned(64))) = 0;
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struct s in5 = {};
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/* .rodata section */
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const volatile struct {
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const int in6;
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} in = {};
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/* .data section */
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int out1 = -1;
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long long out2 = -1;
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/* .bss section */
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char out3 = 0;
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long long out4 = 0;
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int out6 = 0;
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extern bool CONFIG_BPF_SYSCALL __kconfig;
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extern int LINUX_KERNEL_VERSION __kconfig;
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bool bpf_syscall = 0;
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int kern_ver = 0;
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struct s out5 = {};
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const volatile int in_dynarr_sz SEC(".rodata.dyn");
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const volatile int in_dynarr[4] SEC(".rodata.dyn") = { -1, -2, -3, -4 };
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int out_dynarr[4] SEC(".data.dyn") = { 1, 2, 3, 4 };
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int read_mostly_var __read_mostly;
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int out_mostly_var;
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char huge_arr[16 * 1024 * 1024];
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/* non-mmapable custom .data section */
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struct my_value { int x, y, z; };
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__hidden int zero_key SEC(".data.non_mmapable");
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static struct my_value zero_value SEC(".data.non_mmapable");
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__type(key, int);
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__type(value, struct my_value);
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__uint(max_entries, 1);
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} my_map SEC(".maps");
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SEC("raw_tp/sys_enter")
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int handler(const void *ctx)
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{
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int i;
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out1 = in1;
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out2 = in2;
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out3 = in3;
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out4 = in4;
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out5 = in5;
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out6 = in.in6;
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bpf_syscall = CONFIG_BPF_SYSCALL;
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kern_ver = LINUX_KERNEL_VERSION;
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for (i = 0; i < in_dynarr_sz; i++)
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out_dynarr[i] = in_dynarr[i];
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out_mostly_var = read_mostly_var;
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huge_arr[sizeof(huge_arr) - 1] = 123;
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/* make sure zero_key and zero_value are not optimized out */
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bpf_map_update_elem(&my_map, &zero_key, &zero_value, BPF_ANY);
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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