tools/testing/selftests/bpf/progs/verifier_subprog_topo.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/verifier_subprog_topo.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/verifier_subprog_topo.c
Extension
.c
Size
3778 bytes
Lines
227
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2026 Meta Platforms, Inc. and affiliates. */

#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"

/* linear chain main -> A -> B */
__naked __noinline __used
static unsigned long linear_b(void)
{
	asm volatile (
		"r0 = 42;"
		"exit;"
	);
}

__naked __noinline __used
static unsigned long linear_a(void)
{
	asm volatile (
		"call linear_b;"
		"exit;"
	);
}

SEC("?raw_tp")
__success __log_level(2)
__msg("topo_order[0] = linear_b")
__msg("topo_order[1] = linear_a")
__msg("topo_order[2] = topo_linear")
__naked int topo_linear(void)
{
	asm volatile (
		"call linear_a;"
		"exit;"
	);
}

/* diamond main -> A, main -> B, A -> C, B -> C */
__naked __noinline __used
static unsigned long diamond_c(void)
{
	asm volatile (
		"r0 = 1;"
		"exit;"
	);
}

__naked __noinline __used
static unsigned long diamond_b(void)
{
	asm volatile (
		"call diamond_c;"
		"exit;"
	);
}

__naked __noinline __used
static unsigned long diamond_a(void)
{
	asm volatile (
		"call diamond_c;"
		"exit;"
	);
}

SEC("?raw_tp")
__success __log_level(2)
__msg("topo_order[0] = diamond_c")
__msg("topo_order[3] = topo_diamond")
__naked int topo_diamond(void)
{
	asm volatile (
		"call diamond_a;"
		"call diamond_b;"
		"exit;"
	);
}

/* main -> global_a (global) -> static_leaf (static, leaf) */
__naked __noinline __used
static unsigned long static_leaf(void)
{
	asm volatile (
		"r0 = 7;"
		"exit;"
	);
}

Annotation

Implementation Notes