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https://github.com/eunomia-bpf/bpf-developer-tutorial.git
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61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/*
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* This code runs using bpf in the Linux kernel.
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* Copyright 2022- The Yunshan Networks Authors.
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*
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* Modify from https://github.com/deepflowio/deepflow
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* By Yusheng Zheng <1067852565@qq.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <vmlinux.h>
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#include "goroutine.h"
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#include <bpf/bpf_core_read.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#define GOID_OFFSET 0x98
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struct {
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__uint(type, BPF_MAP_TYPE_RINGBUF);
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__uint(max_entries, 256 * 1024);
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} rb SEC(".maps");
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SEC("uprobe/./go-server-http/main:runtime.casgstatus")
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int uprobe_runtime_casgstatus(struct pt_regs *ctx) {
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int newval = ctx->cx;
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void *gp = ctx->ax;
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struct goroutine_execute_data *data;
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u64 goid;
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if (bpf_probe_read_user(&goid, sizeof(goid), gp + GOID_OFFSET) == 0) {
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data = bpf_ringbuf_reserve(&rb, sizeof(*data), 0);
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if (data) {
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u64 pid_tgid = bpf_get_current_pid_tgid();
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data->pid = pid_tgid;
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data->tgid = pid_tgid >> 32;
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data->goid = goid;
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data->state = newval;
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bpf_ringbuf_submit(data, 0);
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}
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}
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return 0;
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}
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char LICENSE[] SEC("license") = "GPL";
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