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

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/bpf.h>
   4 #include <bpf/bpf_helpers.h>
   5 #include "bpf_misc.h"
   6
   7 #if (defined(__TARGET_ARCH_arm64) || defined(__TARGET_ARCH_x86) || \
   8      (defined(__TARGET_ARCH_riscv) && __riscv_xlen == 64)) && __clang_major__ >= 18
   9
  10 SEC("socket")
  11 __description("BSWAP, 16")
  12 __success __success_unpriv __retval(0x23ff)
  13 __naked void bswap_16(void)
  14 {
  15         asm volatile ("                                 \
  16         r0 = 0xff23;                                    \
  17         r0 = bswap16 r0;                                \
  18         exit;                                           \
  19 "       ::: __clobber_all);
  20 }
  21
  22 SEC("socket")
  23 __description("BSWAP, 32")
  24 __success __success_unpriv __retval(0x23ff0000)
  25 __naked void bswap_32(void)
  26 {
  27         asm volatile ("                                 \
  28         r0 = 0xff23;                                    \
  29         r0 = bswap32 r0;                                \
  30         exit;                                           \
  31 "       ::: __clobber_all);
  32 }
  33
  34 SEC("socket")
  35 __description("BSWAP, 64")
  36 __success __success_unpriv __retval(0x34ff12ff)
  37 __naked void bswap_64(void)
  38 {
  39         asm volatile ("                                 \
  40         r0 = %[u64_val] ll;                                     \
  41         r0 = bswap64 r0;                                \
  42         exit;                                           \
  43 "       :
  44         : [u64_val]"i"(0xff12ff34ff56ff78ull)
  45         : __clobber_all);
  46 }
  47
  48 #else
  49
  50 SEC("socket")
  51 __description("cpuv4 is not supported by compiler or jit, use a dummy test")
  52 __success
  53 int dummy_test(void)
  54 {
  55         return 0;
  56 }
  57
  58 #endif
  59
  60 char _license[] SEC("license") = "GPL";