Commit 8555defe authored by Andrii Nakryiko's avatar Andrii Nakryiko Committed by Daniel Borkmann
Browse files

selftests/bpf: Add CO-RE relos into linked_funcs selftests 



Add CO-RE relocations into __weak subprogs for multi-file linked_funcs
selftest to make sure libbpf handles such combination well.

Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220408181425.2287230-4-andrii@kernel.org
parent 2fa5b0f2

tools/testing/selftests/bpf/progs/linked_funcs1.c

+8 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ 
#include "vmlinux.h"

#include <bpf/bpf_helpers.h>

#include <bpf/bpf_tracing.h>

#include <bpf/bpf_core_read.h>



/* weak and shared between two files */

const volatile int my_tid __weak;
@@ -44,6 +45,13 @@ void set_output_ctx1(__u64 *ctx) 
/* this weak instance should win because it's the first one */

__weak int set_output_weak(int x)

{

	static volatile int whatever;



	/* make sure we use CO-RE relocations in a weak function, this used to

	 * cause problems for BPF static linker

	 */

	whatever = bpf_core_type_size(struct task_struct);



	output_weak1 = x;

	return x;

}

tools/testing/selftests/bpf/progs/linked_funcs2.c

+8 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ 
#include "vmlinux.h"

#include <bpf/bpf_helpers.h>

#include <bpf/bpf_tracing.h>

#include <bpf/bpf_core_read.h>



/* weak and shared between both files */

const volatile int my_tid __weak;
@@ -44,6 +45,13 @@ void set_output_ctx2(__u64 *ctx) 
/* this weak instance should lose, because it will be processed second */

__weak int set_output_weak(int x)

{

	static volatile int whatever;



	/* make sure we use CO-RE relocations in a weak function, this used to

	 * cause problems for BPF static linker

	 */

	whatever = 2 * bpf_core_type_size(struct task_struct);



	output_weak2 = x;

	return 2 * x;

}