forked from luck/tmp_suning_uos_patched
d912557b34
The trace bpf samples do not compile on s390x because they use x86 specific fields from the "pt_regs" structure. Fix this and access the fields via new PT_REGS macros. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
/* Copyright (c) 2015 PLUMgrid, http://plumgrid.com
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/ptrace.h>
|
|
#include <linux/version.h>
|
|
#include <uapi/linux/bpf.h>
|
|
#include "bpf_helpers.h"
|
|
|
|
struct pair {
|
|
u64 val;
|
|
u64 ip;
|
|
};
|
|
|
|
struct bpf_map_def SEC("maps") my_map = {
|
|
.type = BPF_MAP_TYPE_HASH,
|
|
.key_size = sizeof(long),
|
|
.value_size = sizeof(struct pair),
|
|
.max_entries = 1000000,
|
|
};
|
|
|
|
/* kprobe is NOT a stable ABI. If kernel internals change this bpf+kprobe
|
|
* example will no longer be meaningful
|
|
*/
|
|
SEC("kprobe/kmem_cache_free")
|
|
int bpf_prog1(struct pt_regs *ctx)
|
|
{
|
|
long ptr = PT_REGS_PARM2(ctx);
|
|
|
|
bpf_map_delete_elem(&my_map, &ptr);
|
|
return 0;
|
|
}
|
|
|
|
SEC("kretprobe/kmem_cache_alloc_node")
|
|
int bpf_prog2(struct pt_regs *ctx)
|
|
{
|
|
long ptr = PT_REGS_RC(ctx);
|
|
long ip = 0;
|
|
|
|
/* get ip address of kmem_cache_alloc_node() caller */
|
|
bpf_probe_read(&ip, sizeof(ip), (void *)(PT_REGS_FP(ctx) + sizeof(ip)));
|
|
|
|
struct pair v = {
|
|
.val = bpf_ktime_get_ns(),
|
|
.ip = ip,
|
|
};
|
|
|
|
bpf_map_update_elem(&my_map, &ptr, &v, BPF_ANY);
|
|
return 0;
|
|
}
|
|
char _license[] SEC("license") = "GPL";
|
|
u32 _version SEC("version") = LINUX_VERSION_CODE;
|