linux/tools/testing/selftests/bpf/progs/verifier_linked_scalars.c

// SPDX-License-Identifier: GPL-2.0

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

SEC("socket")
__description("scalars: find linked scalars")
__failure
__msg("math between fp pointer and 2147483647 is not allowed")
__naked void scalars(void)
{
	asm volatile ("				\
	r0 = 0;					\
	r1 = 0x80000001 ll;			\
	r1 /= 1;				\
	r2 = r1;				\
	r4 = r1;				\
	w2 += 0x7FFFFFFF;			\
	w4 += 0;				\
	if r2 == 0 goto l1;			\
	exit;					\
l1:						\
	r4 >>= 63;				\
	r3 = 1;					\
	r3 -= r4;				\
	r3 *= 0x7FFFFFFF;			\
	r3 += r10;				\
	*(u8*)(r3 - 1) = r0;			\
	exit;					\
"	::: __clobber_all);
}

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