linux/tools/testing/selftests/bpf/progs/test_core_reloc_enumval.c
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   1// SPDX-License-Identifier: GPL-2.0
   2// Copyright (c) 2020 Facebook
   3
   4#include <linux/bpf.h>
   5#include <stdint.h>
   6#include <stdbool.h>
   7#include <bpf/bpf_helpers.h>
   8#include <bpf/bpf_core_read.h>
   9
  10char _license[] SEC("license") = "GPL";
  11
  12struct {
  13        char in[256];
  14        char out[256];
  15        bool skip;
  16} data = {};
  17
  18enum named_enum {
  19        NAMED_ENUM_VAL1 = 1,
  20        NAMED_ENUM_VAL2 = 2,
  21        NAMED_ENUM_VAL3 = 3,
  22};
  23
  24typedef enum {
  25        ANON_ENUM_VAL1 = 0x10,
  26        ANON_ENUM_VAL2 = 0x20,
  27        ANON_ENUM_VAL3 = 0x30,
  28} anon_enum;
  29
  30struct core_reloc_enumval_output {
  31        bool named_val1_exists;
  32        bool named_val2_exists;
  33        bool named_val3_exists;
  34        bool anon_val1_exists;
  35        bool anon_val2_exists;
  36        bool anon_val3_exists;
  37
  38        int named_val1;
  39        int named_val2;
  40        int anon_val1;
  41        int anon_val2;
  42};
  43
  44SEC("raw_tracepoint/sys_enter")
  45int test_core_enumval(void *ctx)
  46{
  47#if __has_builtin(__builtin_preserve_enum_value)
  48        struct core_reloc_enumval_output *out = (void *)&data.out;
  49        enum named_enum named = 0;
  50        anon_enum anon = 0;
  51
  52        out->named_val1_exists = bpf_core_enum_value_exists(named, NAMED_ENUM_VAL1);
  53        out->named_val2_exists = bpf_core_enum_value_exists(enum named_enum, NAMED_ENUM_VAL2);
  54        out->named_val3_exists = bpf_core_enum_value_exists(enum named_enum, NAMED_ENUM_VAL3);
  55
  56        out->anon_val1_exists = bpf_core_enum_value_exists(anon, ANON_ENUM_VAL1);
  57        out->anon_val2_exists = bpf_core_enum_value_exists(anon_enum, ANON_ENUM_VAL2);
  58        out->anon_val3_exists = bpf_core_enum_value_exists(anon_enum, ANON_ENUM_VAL3);
  59
  60        out->named_val1 = bpf_core_enum_value(named, NAMED_ENUM_VAL1);
  61        out->named_val2 = bpf_core_enum_value(named, NAMED_ENUM_VAL2);
  62        /* NAMED_ENUM_VAL3 value is optional */
  63
  64        out->anon_val1 = bpf_core_enum_value(anon, ANON_ENUM_VAL1);
  65        out->anon_val2 = bpf_core_enum_value(anon, ANON_ENUM_VAL2);
  66        /* ANON_ENUM_VAL3 value is optional */
  67#else
  68        data.skip = true;
  69#endif
  70
  71        return 0;
  72}
  73
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