gcc/config/arm/driver-arm.c

   1 /* Subroutines for the gcc driver.
   2    Copyright (C) 2011, 2012 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 #include "config.h"
  21 #include "system.h"
  22 #include "coretypes.h"
  23 #include "tm.h"
  24 #include "configargs.h"
  25
  26 struct vendor_cpu {
  27   const char *part_no;
  28   const char *arch_name;
  29   const char *cpu_name;
  30 };
  31
  32 static struct vendor_cpu arm_cpu_table[] = {
  33     {"0x926", "armv5te", "arm926ej-s"},
  34     {"0xa26", "armv5te", "arm1026ej-s"},
  35     {"0xb02", "armv6k", "mpcore"},
  36     {"0xb36", "armv6j", "arm1136j-s"},
  37     {"0xb56", "armv6t2", "arm1156t2-s"},
  38     {"0xb76", "armv6zk", "arm1176jz-s"},
  39     {"0xc05", "armv7-a", "cortex-a5"},
  40     {"0xc07", "armv7-a", "cortex-a7"},
  41     {"0xc08", "armv7-a", "cortex-a8"},
  42     {"0xc09", "armv7-a", "cortex-a9"},
  43     {"0xc0f", "armv7-a", "cortex-a15"},
  44     {"0xc14", "armv7-r", "cortex-r4"},
  45     {"0xc15", "armv7-r", "cortex-r5"},
  46     {"0xc20", "armv6-m", "cortex-m0"},
  47     {"0xc21", "armv6-m", "cortex-m1"},
  48     {"0xc23", "armv7-m", "cortex-m3"},
  49     {"0xc24", "armv7e-m", "cortex-m4"},
  50     {NULL, NULL, NULL}
  51 };
  52
  53 static struct {
  54   const char *vendor_no;
  55   const struct vendor_cpu *vendor_parts;
  56 } vendors[] = {
  57     {"0x41", arm_cpu_table},
  58     {NULL, NULL}
  59 };
  60
  61 /* This will be called by the spec parser in gcc.c when it sees
  62    a %:local_cpu_detect(args) construct.  Currently it will be called
  63    with either "arch", "cpu" or "tune" as argument depending on if
  64    -march=native, -mcpu=native or -mtune=native is to be substituted.
  65
  66    It returns a string containing new command line parameters to be
  67    put at the place of the above two options, depending on what CPU
  68    this is executed.  E.g. "-march=armv7-a" on a Cortex-A8 for
  69    -march=native.  If the routine can't detect a known processor,
  70    the -march or -mtune option is discarded.
  71
  72    ARGC and ARGV are set depending on the actual arguments given
  73    in the spec.  */
  74 const char *
  75 host_detect_local_cpu (int argc, const char **argv)
  76 {
  77   const char *val = NULL;
  78   char buf[128];
  79   FILE *f = NULL;
  80   bool arch;
  81   const struct vendor_cpu *cpu_table = NULL;
  82
  83   if (argc < 1)
  84     goto not_found;
  85
  86   arch = strcmp (argv[0], "arch") == 0;
  87   if (!arch && strcmp (argv[0], "cpu") != 0 && strcmp (argv[0], "tune"))
  88     goto not_found;
  89
  90   f = fopen ("/proc/cpuinfo", "r");
  91   if (f == NULL)
  92     goto not_found;
  93
  94   while (fgets (buf, sizeof (buf), f) != NULL)
  95     {
  96       /* Ensure that CPU implementer is ARM (0x41).  */
  97       if (strncmp (buf, "CPU implementer", sizeof ("CPU implementer") - 1) == 0)
  98         {
  99           int i;
 100           for (i = 0; vendors[i].vendor_no != NULL; i++)
 101             if (strstr (buf, vendors[i].vendor_no) != NULL)
 102               {
 103                 cpu_table = vendors[i].vendor_parts;
 104                 break;
 105               }
 106         }
 107
 108       /* Detect arch/cpu.  */
 109       if (strncmp (buf, "CPU part", sizeof ("CPU part") - 1) == 0)
 110         {
 111           int i;
 112
 113           if (cpu_table == NULL)
 114             goto not_found;
 115
 116           for (i = 0; cpu_table[i].part_no != NULL; i++)
 117             if (strstr (buf, cpu_table[i].part_no) != NULL)
 118               {
 119                 val = arch ? cpu_table[i].arch_name : cpu_table[i].cpu_name;
 120                 break;
 121               }
 122           break;
 123         }
 124     }
 125
 126   fclose (f);
 127
 128   if (val == NULL)
 129     goto not_found;
 130
 131   return concat ("-m", argv[0], "=", val, NULL);
 132
 133 not_found:
 134   {
 135     unsigned int i;
 136     unsigned int opt;
 137     const char *search[] = {NULL, "arch"};
 138
 139     if (f)
 140       fclose (f);
 141
 142     search[0] = argv[0];
 143     for (opt = 0; opt < ARRAY_SIZE (search); opt++)
 144       for (i = 0; i < ARRAY_SIZE (configure_default_options); i++)
 145         if (strcmp (configure_default_options[i].name, search[opt]) == 0)
 146           return concat ("-m", search[opt], "=",
 147                          configure_default_options[i].value, NULL);
 148     return NULL;
 149   }
 150 }