90a1deda75
On non-SMP kernels __per_cpu_start is not 0, so look it up in kallsyms. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20200910171336.3161995-1-iii@linux.ibm.com
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (c) 2019 Facebook */
|
|
|
|
#include <test_progs.h>
|
|
#include "test_ksyms.skel.h"
|
|
#include <sys/stat.h>
|
|
|
|
static int duration;
|
|
|
|
static __u64 kallsyms_find(const char *sym)
|
|
{
|
|
char type, name[500];
|
|
__u64 addr, res = 0;
|
|
FILE *f;
|
|
|
|
f = fopen("/proc/kallsyms", "r");
|
|
if (CHECK(!f, "kallsyms_fopen", "failed to open: %d\n", errno))
|
|
return 0;
|
|
|
|
while (fscanf(f, "%llx %c %499s%*[^\n]\n", &addr, &type, name) > 0) {
|
|
if (strcmp(name, sym) == 0) {
|
|
res = addr;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
CHECK(false, "not_found", "symbol %s not found\n", sym);
|
|
out:
|
|
fclose(f);
|
|
return res;
|
|
}
|
|
|
|
void test_ksyms(void)
|
|
{
|
|
__u64 per_cpu_start_addr = kallsyms_find("__per_cpu_start");
|
|
__u64 link_fops_addr = kallsyms_find("bpf_link_fops");
|
|
const char *btf_path = "/sys/kernel/btf/vmlinux";
|
|
struct test_ksyms *skel;
|
|
struct test_ksyms__data *data;
|
|
struct stat st;
|
|
__u64 btf_size;
|
|
int err;
|
|
|
|
if (CHECK(stat(btf_path, &st), "stat_btf", "err %d\n", errno))
|
|
return;
|
|
btf_size = st.st_size;
|
|
|
|
skel = test_ksyms__open_and_load();
|
|
if (CHECK(!skel, "skel_open", "failed to open and load skeleton\n"))
|
|
return;
|
|
|
|
err = test_ksyms__attach(skel);
|
|
if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
|
|
goto cleanup;
|
|
|
|
/* trigger tracepoint */
|
|
usleep(1);
|
|
|
|
data = skel->data;
|
|
CHECK(data->out__bpf_link_fops != link_fops_addr, "bpf_link_fops",
|
|
"got 0x%llx, exp 0x%llx\n",
|
|
data->out__bpf_link_fops, link_fops_addr);
|
|
CHECK(data->out__bpf_link_fops1 != 0, "bpf_link_fops1",
|
|
"got %llu, exp %llu\n", data->out__bpf_link_fops1, (__u64)0);
|
|
CHECK(data->out__btf_size != btf_size, "btf_size",
|
|
"got %llu, exp %llu\n", data->out__btf_size, btf_size);
|
|
CHECK(data->out__per_cpu_start != per_cpu_start_addr, "__per_cpu_start",
|
|
"got %llu, exp %llu\n", data->out__per_cpu_start,
|
|
per_cpu_start_addr);
|
|
|
|
cleanup:
|
|
test_ksyms__destroy(skel);
|
|
}
|