gcc/config/arm/driver-arm.cc

   1 /* Subroutines for the gcc driver.
   2    Copyright (C) 2011-2025 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 GCC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #define IN_TARGET_CODE 1
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "configargs.h"
  27
  28 struct vendor_cpu
  29 {
  30   const char *part_no;
  31   const char *arch_name;
  32   const char *cpu_name;
  33 };
  34
  35 struct vendor
  36 {
  37   const char *vendor_no;
  38   const struct vendor_cpu *vendor_parts;
  39 };
  40
  41 #include "arm-native.h"
  42
  43 /* This will be called by the spec parser in gcc.cc when it sees
  44    a %:local_cpu_detect(args) construct.  Currently it will be called
  45    with either "arch", "cpu" or "tune" as argument depending on if
  46    -march=native, -mcpu=native or -mtune=native is to be substituted.
  47
  48    It returns a string containing new command line parameters to be
  49    put at the place of the above two options, depending on what CPU
  50    this is executed.  E.g. "-march=armv7-a" on a Cortex-A8 for
  51    -march=native.  If the routine can't detect a known processor,
  52    the -march or -mtune option is discarded.
  53
  54    ARGC and ARGV are set depending on the actual arguments given
  55    in the spec.  */
  56 const char *
  57 host_detect_local_cpu (int argc, const char **argv)
  58 {
  59   const char *val = NULL;
  60   char buf[128];
  61   FILE *f = NULL;
  62   bool arch;
  63   const struct vendor_cpu *cpu_table = NULL;
  64   char *fcpu_info = NULL;
  65
  66   if (argc < 1)
  67     goto not_found;
  68
  69   arch = strcmp (argv[0], "arch") == 0;
  70   if (!arch && strcmp (argv[0], "cpu") != 0 && strcmp (argv[0], "tune"))
  71     goto not_found;
  72
  73   fcpu_info = getenv ("GCC_CPUINFO");
  74   if (fcpu_info)
  75     f = fopen (fcpu_info, "r");
  76   else
  77     f = fopen ("/proc/cpuinfo", "r");
  78
  79   if (f == NULL)
  80     goto not_found;
  81
  82   while (fgets (buf, sizeof (buf), f) != NULL)
  83     {
  84       /* Find the vendor table associated with this implementer.  */
  85       if (startswith (buf, "CPU implementer"))
  86         {
  87           int i;
  88           for (i = 0; vendors_table[i].vendor_no != NULL; i++)
  89             if (strstr (buf, vendors_table[i].vendor_no) != NULL)
  90               {
  91                 cpu_table = vendors_table[i].vendor_parts;
  92                 break;
  93               }
  94         }
  95
  96       /* Detect arch/cpu.  */
  97       if (startswith (buf, "CPU part"))
  98         {
  99           int i;
 100
 101           if (cpu_table == NULL)
 102             goto not_found;
 103
 104           for (i = 0; cpu_table[i].part_no != NULL; i++)
 105             if (strstr (buf, cpu_table[i].part_no) != NULL)
 106               {
 107                 val = arch ? cpu_table[i].arch_name : cpu_table[i].cpu_name;
 108                 break;
 109               }
 110           break;
 111         }
 112     }
 113
 114   if (val)
 115     {
 116       fclose (f);
 117       return concat ("-m", argv[0], "=", val, NULL);
 118      }
 119
 120 not_found:
 121   {
 122     unsigned int i;
 123     unsigned int opt;
 124     const char *search[] = {NULL, "arch"};
 125
 126     if (f)
 127       fclose (f);
 128
 129     search[0] = argv[0];
 130     for (opt = 0; opt < ARRAY_SIZE (search); opt++)
 131       for (i = 0; i < ARRAY_SIZE (configure_default_options); i++)
 132         if (strcmp (configure_default_options[i].name, search[opt]) == 0)
 133           return concat ("-m", search[opt], "=",
 134                          configure_default_options[i].value, NULL);
 135     return NULL;
 136   }
 137 }