75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2022, Oracle and/or its affiliates. */
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#include "bpf_iter.h"
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#include <bpf/bpf_helpers.h>
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char _license[] SEC("license") = "GPL";
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unsigned long last_sym_value = 0;
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static inline char to_lower(char c)
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{
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if (c >= 'A' && c <= 'Z')
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c += ('a' - 'A');
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return c;
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}
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static inline char to_upper(char c)
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{
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if (c >= 'a' && c <= 'z')
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c -= ('a' - 'A');
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return c;
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}
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/* Dump symbols with max size; the latter is calculated by caching symbol N value
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* and when iterating on symbol N+1, we can print max size of symbol N via
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* address of N+1 - address of N.
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*/
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SEC("iter/ksym")
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int dump_ksym(struct bpf_iter__ksym *ctx)
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{
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struct seq_file *seq = ctx->meta->seq;
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struct kallsym_iter *iter = ctx->ksym;
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__u32 seq_num = ctx->meta->seq_num;
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unsigned long value;
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char type;
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int ret;
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if (!iter)
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return 0;
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if (seq_num == 0) {
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BPF_SEQ_PRINTF(seq, "ADDR TYPE NAME MODULE_NAME KIND MAX_SIZE\n");
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return 0;
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}
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if (last_sym_value)
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BPF_SEQ_PRINTF(seq, "0x%x\n", iter->value - last_sym_value);
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else
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BPF_SEQ_PRINTF(seq, "\n");
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value = iter->show_value ? iter->value : 0;
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last_sym_value = value;
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type = iter->type;
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if (iter->module_name[0]) {
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type = iter->exported ? to_upper(type) : to_lower(type);
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BPF_SEQ_PRINTF(seq, "0x%llx %c %s [ %s ] ",
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value, type, iter->name, iter->module_name);
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} else {
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BPF_SEQ_PRINTF(seq, "0x%llx %c %s ", value, type, iter->name);
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}
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if (!iter->pos_arch_end || iter->pos_arch_end > iter->pos)
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BPF_SEQ_PRINTF(seq, "CORE ");
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else if (!iter->pos_mod_end || iter->pos_mod_end > iter->pos)
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BPF_SEQ_PRINTF(seq, "MOD ");
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else if (!iter->pos_ftrace_mod_end || iter->pos_ftrace_mod_end > iter->pos)
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BPF_SEQ_PRINTF(seq, "FTRACE_MOD ");
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else if (!iter->pos_bpf_end || iter->pos_bpf_end > iter->pos)
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BPF_SEQ_PRINTF(seq, "BPF ");
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else
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BPF_SEQ_PRINTF(seq, "KPROBE ");
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return 0;
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}
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