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1// SPDX-License-Identifier: GPL-2.02/* Copyright (c) 2022, Oracle and/or its affiliates. */3#include "bpf_iter.h"4#include <bpf/bpf_helpers.h>5 6char _license[] SEC("license") = "GPL";7 8unsigned long last_sym_value = 0;9 10static inline char to_lower(char c)11{12 if (c >= 'A' && c <= 'Z')13 c += ('a' - 'A');14 return c;15}16 17static inline char to_upper(char c)18{19 if (c >= 'a' && c <= 'z')20 c -= ('a' - 'A');21 return c;22}23 24/* Dump symbols with max size; the latter is calculated by caching symbol N value25 * and when iterating on symbol N+1, we can print max size of symbol N via26 * address of N+1 - address of N.27 */28SEC("iter/ksym")29int dump_ksym(struct bpf_iter__ksym *ctx)30{31 struct seq_file *seq = ctx->meta->seq;32 struct kallsym_iter *iter = ctx->ksym;33 __u32 seq_num = ctx->meta->seq_num;34 unsigned long value;35 char type;36 37 if (!iter)38 return 0;39 40 if (seq_num == 0) {41 BPF_SEQ_PRINTF(seq, "ADDR TYPE NAME MODULE_NAME KIND MAX_SIZE\n");42 return 0;43 }44 if (last_sym_value)45 BPF_SEQ_PRINTF(seq, "0x%x\n", iter->value - last_sym_value);46 else47 BPF_SEQ_PRINTF(seq, "\n");48 49 value = iter->show_value ? iter->value : 0;50 51 last_sym_value = value;52 53 type = iter->type;54 55 if (iter->module_name[0]) {56 type = iter->exported ? to_upper(type) : to_lower(type);57 BPF_SEQ_PRINTF(seq, "0x%llx %c %s [ %s ] ",58 value, type, iter->name, iter->module_name);59 } else {60 BPF_SEQ_PRINTF(seq, "0x%llx %c %s ", value, type, iter->name);61 }62 if (!iter->pos_mod_end || iter->pos_mod_end > iter->pos)63 BPF_SEQ_PRINTF(seq, "MOD ");64 else if (!iter->pos_ftrace_mod_end || iter->pos_ftrace_mod_end > iter->pos)65 BPF_SEQ_PRINTF(seq, "FTRACE_MOD ");66 else if (!iter->pos_bpf_end || iter->pos_bpf_end > iter->pos)67 BPF_SEQ_PRINTF(seq, "BPF ");68 else69 BPF_SEQ_PRINTF(seq, "KPROBE ");70 return 0;71}72