gcc/config/arm/driver-arm.c

   1 /* Subroutines for the gcc driver.
   2    Copyright (C) 2011-2018 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.c 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
  65   if (argc < 1)
  66     goto not_found;
  67
  68   arch = strcmp (argv[0], "arch") == 0;
  69   if (!arch && strcmp (argv[0], "cpu") != 0 && strcmp (argv[0], "tune"))
  70     goto not_found;
  71
  72   f = fopen ("/proc/cpuinfo", "r");
  73   if (f == NULL)
  74     goto not_found;
  75
  76   while (fgets (buf, sizeof (buf), f) != NULL)
  77     {
  78       /* Find the vendor table associated with this implementer.  */
  79       if (strncmp (buf, "CPU implementer", sizeof ("CPU implementer") - 1) == 0)
  80         {
  81           int i;
  82           for (i = 0; vendors_table[i].vendor_no != NULL; i++)
  83             if (strstr (buf, vendors_table[i].vendor_no) != NULL)
  84               {
  85                 cpu_table = vendors_table[i].vendor_parts;
  86                 break;
  87               }
  88         }
  89
  90       /* Detect arch/cpu.  */
  91       if (strncmp (buf, "CPU part", sizeof ("CPU part") - 1) == 0)
  92         {
  93           int i;
  94
  95           if (cpu_table == NULL)
  96             goto not_found;
  97
  98           for (i = 0; cpu_table[i].part_no != NULL; i++)
  99             if (strstr (buf, cpu_table[i].part_no) != NULL)
 100               {
 101                 val = arch ? cpu_table[i].arch_name : cpu_table[i].cpu_name;
 102                 break;
 103               }
 104           break;
 105         }
 106     }
 107
 108   if (val)
 109     {
 110       fclose (f);
 111       return concat ("-m", argv[0], "=", val, NULL);
 112      }
 113
 114 not_found:
 115   {
 116     unsigned int i;
 117     unsigned int opt;
 118     const char *search[] = {NULL, "arch"};
 119
 120     if (f)
 121       fclose (f);
 122
 123     search[0] = argv[0];
 124     for (opt = 0; opt < ARRAY_SIZE (search); opt++)
 125       for (i = 0; i < ARRAY_SIZE (configure_default_options); i++)
 126         if (strcmp (configure_default_options[i].name, search[opt]) == 0)
 127           return concat ("-m", search[opt], "=",
 128                          configure_default_options[i].value, NULL);
 129     return NULL;
 130   }
 131 }