mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 00:34:20 +08:00
138d6153a1
Add the necessary definitions for building bpf samples on ppc. Since ppc doesn't store function return address on the stack, modify how PT_REGS_RET() and PT_REGS_FP() work. Also, introduce PT_REGS_IP() to access the instruction pointer. Cc: Alexei Starovoitov <ast@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: David S. Miller <davem@davemloft.net> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
55 lines
1.2 KiB
C
55 lines
1.2 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_KRETPROBE_READ_RET_IP(ip, ctx);
|
|
|
|
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;
|