Quelle  verifier_gotol.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0

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

#ifdef CAN_USE_GOTOL

SEC("socket")
__description("gotol, small_imm")
__success __success_unpriv __retval(1)
__naked void gotol_small_imm(void)
{
 asm volatile (" \
 call %[bpf_ktime_get_ns];   \
 if r0 == 0 goto l0_%=;    \
 gotol l1_%=;     \
l2_%=:       \
 gotol l3_%=;     \
l1_%=:       \
 r0 = 1;      \
 gotol l2_%=;     \
l0_%=:       \
 r0 = 2;      \
l3_%=:       \
 exit;      \
" :
 : __imm(bpf_ktime_get_ns)
 : __clobber_all);
}

SEC("socket")
__description("gotol, large_imm")
__success __failure_unpriv __retval(40000)
__naked void gotol_large_imm(void)
{
 asm volatile (" \
 gotol 1f;     \
0:       \
 r0 = 0;      \
 .rept 40000;     \
 r0 += 1;     \
 .endr;      \
 exit;      \
1: gotol 0b;     \
" :
 :
 : __clobber_all);
}

#else

SEC("socket")
__description("cpuv4 is not supported by compiler or jit, use a dummy test")
__success
int dummy_test(void)
{
 return 0;
}

#endif

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