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examples/c: demo how to get IP for uprobe and uretprobe #221

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examples/c: demo how to get IP for uprobe and uretprobe #221

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24 changes: 18 additions & 6 deletions examples/c/uprobe.bpf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3,33 +3,45 @@
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_core_read.h>

char LICENSE[] SEC("license") = "Dual BSD/GPL";

SEC("uprobe")
int BPF_KPROBE(uprobe_add, int a, int b)
int BPF_UPROBE(uprobe_add, int a, int b)
{
bpf_printk("uprobed_add ENTRY: a = %d, b = %d", a, b);
long ip;

ip = PT_REGS_IP(ctx);
bpf_printk("UPROBE IP 0x%lx.", ip);
return 0;
}

SEC("uretprobe")
int BPF_KRETPROBE(uretprobe_add, int ret)
int BPF_URETPROBE(uretprobe_add, int ret)
{
bpf_printk("uprobed_add EXIT: return = %d", ret);
struct task_struct *t = (void *)bpf_get_current_task();
struct uprobe_dispatch_data *ud;
long ip;

ud = (void *)BPF_CORE_READ(t, utask, vaddr);
ip = BPF_CORE_READ(ud, bp_addr);
bpf_printk("URETPROBE IP 0x%lx.", ip);
return 0;
}

/*
SEC("uprobe//proc/self/exe:uprobed_sub")
int BPF_KPROBE(uprobe_sub, int a, int b)
int BPF_UPROBE(uprobe_sub, int a, int b)
{
bpf_printk("uprobed_sub ENTRY: a = %d, b = %d", a, b);
return 0;
}

SEC("uretprobe//proc/self/exe:uprobed_sub")
int BPF_KRETPROBE(uretprobe_sub, int ret)
int BPF_URETPROBE(uretprobe_sub, int ret)
{
bpf_printk("uprobed_sub EXIT: return = %d", ret);
return 0;
}
*/
2 changes: 2 additions & 0 deletions examples/c/uprobe.c
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,8 @@ static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va
/* It's a global function to make sure compiler doesn't inline it. */
int uprobed_add(int a, int b)
{
printf("Triggering user function test_func, addr %p...\n",
(const void *)&uprobed_add);
return a + b;
}

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