gcc/config/bpf/bpf-c.cc

   1 /* BPF-specific code for C family languages.
   2    Copyright (C) 2024 Free Software Foundation, Inc.
   3    Contributed by Oracle Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #define IN_TARGET_CODE 1
  22
  23 #include "config.h"
  24 #include "system.h"
  25 #include "coretypes.h"
  26 #include "tm.h"
  27 #include "c-family/c-common.h"
  28 #include "cpplib.h"
  29
  30 /* Define target-specific CPP macros.  This function in used in the
  31    definition of TARGET_CPU_CPP_BUILTINS in bpf.h */
  32
  33 #define builtin_define(TXT) cpp_define (pfile, TXT)
  34
  35 void
  36 bpf_target_macros (cpp_reader *pfile)
  37 {
  38   builtin_define ("__BPF__");
  39   builtin_define ("__bpf__");
  40
  41   if (TARGET_BIG_ENDIAN)
  42     builtin_define ("__BPF_BIG_ENDIAN__");
  43   else
  44     builtin_define ("__BPF_LITTLE_ENDIAN__");
  45
  46   switch (bpf_isa)
  47     {
  48     case ISA_V1:
  49       builtin_define_with_int_value ("__BPF_CPU_VERSION__", 1);
  50       break;
  51     case ISA_V2:
  52       builtin_define_with_int_value ("__BPF_CPU_VERSION__", 2);
  53       break;
  54     case ISA_V3:
  55       builtin_define_with_int_value ("__BPF_CPU_VERSION__", 3);
  56       break;
  57     case ISA_V4:
  58       builtin_define_with_int_value ("__BPF_CPU_VERSION__", 4);
  59       break;
  60     default:
  61       gcc_unreachable ();
  62       break;
  63     }
  64
  65   /* Different BPF CPU versions support different features.  Some of
  66      them can be enabled/disabled explicitly.  */
  67   if (bpf_has_alu32)
  68     builtin_define ("__BPF_FEATURE_ALU32");
  69   if (bpf_has_jmp32)
  70     builtin_define ("__BPF_FEATURE_JMP32");
  71   if (bpf_has_jmpext)
  72     builtin_define ("__BPF_FEATURE_JMP_EXT");
  73   if (bpf_has_bswap)
  74     builtin_define ("__BPF_FEATURE_BSWAP");
  75   if (bpf_has_sdiv)
  76     builtin_define ("__BPF_FEATURE_SDIV_SMOD");
  77   if (bpf_has_smov)
  78     builtin_define ("__BPF_FEATURE_MOVSX");
  79
  80   /* Other CPU features can only be enabled/disabled generically by
  81      selecting the corresponding CPU version.  */
  82   if (bpf_isa >= ISA_V4)
  83     {
  84       builtin_define ("__BPF_FEATURE_LDSX");
  85       builtin_define ("__BPF_FEATURE_GOTOL");
  86       builtin_define ("__BPF_FEATURE_ST");
  87     }
  88 }