selftests/bpf: Add test validating data section to struct convertion layout

// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2019 Facebook */

#include <test_progs.h>

struct s {

	int a;

	long long b;

} __attribute__((packed));

#include "test_skeleton.skel.h"

BPF_EMBED_OBJ(skeleton, "test_skeleton.o");

void test_skeleton(void)

{

	int duration = 0, err;

	struct test_skeleton* skel;

	struct test_skeleton__bss *bss;

	skel = test_skeleton__open_and_load(&skeleton_embed);

	if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))

		return;

	bss = skel->bss;

	bss->in1 = 1;

	bss->in2 = 2;

	bss->in3 = 3;

	bss->in4 = 4;

	bss->in5.a = 5;

	bss->in5.b = 6;

	err = test_skeleton__attach(skel);

	if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))

		goto cleanup;

	/* trigger tracepoint */

	usleep(1);

	CHECK(bss->out1 != 1, "res1", "got %d != exp %d\n", bss->out1, 1);

	CHECK(bss->out2 != 2, "res2", "got %lld != exp %d\n", bss->out2, 2);

	CHECK(bss->out3 != 3, "res3", "got %d != exp %d\n", (int)bss->out3, 3);

	CHECK(bss->out4 != 4, "res4", "got %lld != exp %d\n", bss->out4, 4);

	CHECK(bss->handler_out5.a != 5, "res5", "got %d != exp %d\n",

	      bss->handler_out5.a, 5);

	CHECK(bss->handler_out5.b != 6, "res6", "got %lld != exp %d\n",

	      bss->handler_out5.b, 6);

cleanup:

	test_skeleton__destroy(skel);

}

// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2019 Facebook */

#include <linux/bpf.h>

#include "bpf_helpers.h"

struct s {

	int a;

	long long b;

} __attribute__((packed));

int in1 = 0;

long long in2 = 0;

char in3 = '\0';

long long in4 __attribute__((aligned(64))) = 0;

struct s in5 = {};

long long out2 = 0;

char out3 = 0;

long long out4 = 0;

int out1 = 0;

SEC("raw_tp/sys_enter")

int handler(const void *ctx)

{

	static volatile struct s out5;

	out1 = in1;

	out2 = in2;

	out3 = in3;

	out4 = in4;

	out5 = in5;

	return 0;

}

char _license[] SEC("license") = "GPL";