gcc/config/arm/driver-arm.c

   1 /* Subroutines for the gcc driver.
   2    Copyright (C) 2011-2016 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     /* armv6kz is the correct spelling for ARMv6KZ but may not be supported in
  39        the version of binutils used.  The incorrect spelling is supported in
  40        legacy and current binutils so that is used instead.  */
  41     {"0xb76", "armv6zk", "arm1176jz-s"},
  42     {"0xc05", "armv7-a", "cortex-a5"},
  43     {"0xc07", "armv7ve", "cortex-a7"},
  44     {"0xc08", "armv7-a", "cortex-a8"},
  45     {"0xc09", "armv7-a", "cortex-a9"},
  46     {"0xc0d", "armv7ve", "cortex-a12"},
  47     {"0xc0e", "armv7ve", "cortex-a17"},
  48     {"0xc0f", "armv7ve", "cortex-a15"},
  49     {"0xd01", "armv8-a+crc", "cortex-a32"},
  50     {"0xd04", "armv8-a+crc", "cortex-a35"},
  51     {"0xd03", "armv8-a+crc", "cortex-a53"},
  52     {"0xd07", "armv8-a+crc", "cortex-a57"},
  53     {"0xd08", "armv8-a+crc", "cortex-a72"},
  54     {"0xd09", "armv8-a+crc", "cortex-a73"},
  55     {"0xc14", "armv7-r", "cortex-r4"},
  56     {"0xc15", "armv7-r", "cortex-r5"},
  57     {"0xc20", "armv6-m", "cortex-m0"},
  58     {"0xc21", "armv6-m", "cortex-m1"},
  59     {"0xc23", "armv7-m", "cortex-m3"},
  60     {"0xc24", "armv7e-m", "cortex-m4"},
  61     {NULL, NULL, NULL}
  62 };
  63
  64 static struct {
  65   const char *vendor_no;
  66   const struct vendor_cpu *vendor_parts;
  67 } vendors[] = {
  68     {"0x41", arm_cpu_table},
  69     {NULL, NULL}
  70 };
  71
  72 /* This will be called by the spec parser in gcc.c when it sees
  73    a %:local_cpu_detect(args) construct.  Currently it will be called
  74    with either "arch", "cpu" or "tune" as argument depending on if
  75    -march=native, -mcpu=native or -mtune=native is to be substituted.
  76
  77    It returns a string containing new command line parameters to be
  78    put at the place of the above two options, depending on what CPU
  79    this is executed.  E.g. "-march=armv7-a" on a Cortex-A8 for
  80    -march=native.  If the routine can't detect a known processor,
  81    the -march or -mtune option is discarded.
  82
  83    ARGC and ARGV are set depending on the actual arguments given
  84    in the spec.  */
  85 const char *
  86 host_detect_local_cpu (int argc, const char **argv)
  87 {
  88   const char *val = NULL;
  89   char buf[128];
  90   FILE *f = NULL;
  91   bool arch;
  92   const struct vendor_cpu *cpu_table = NULL;
  93
  94   if (argc < 1)
  95     goto not_found;
  96
  97   arch = strcmp (argv[0], "arch") == 0;
  98   if (!arch && strcmp (argv[0], "cpu") != 0 && strcmp (argv[0], "tune"))
  99     goto not_found;
 100
 101   f = fopen ("/proc/cpuinfo", "r");
 102   if (f == NULL)
 103     goto not_found;
 104
 105   while (fgets (buf, sizeof (buf), f) != NULL)
 106     {
 107       /* Ensure that CPU implementer is ARM (0x41).  */
 108       if (strncmp (buf, "CPU implementer", sizeof ("CPU implementer") - 1) == 0)
 109         {
 110           int i;
 111           for (i = 0; vendors[i].vendor_no != NULL; i++)
 112             if (strstr (buf, vendors[i].vendor_no) != NULL)
 113               {
 114                 cpu_table = vendors[i].vendor_parts;
 115                 break;
 116               }
 117         }
 118
 119       /* Detect arch/cpu.  */
 120       if (strncmp (buf, "CPU part", sizeof ("CPU part") - 1) == 0)
 121         {
 122           int i;
 123
 124           if (cpu_table == NULL)
 125             goto not_found;
 126
 127           for (i = 0; cpu_table[i].part_no != NULL; i++)
 128             if (strstr (buf, cpu_table[i].part_no) != NULL)
 129               {
 130                 val = arch ? cpu_table[i].arch_name : cpu_table[i].cpu_name;
 131                 break;
 132               }
 133           break;
 134         }
 135     }
 136
 137   if (val)
 138     {
 139       fclose (f);
 140       return concat ("-m", argv[0], "=", val, NULL);
 141      }
 142
 143 not_found:
 144   {
 145     unsigned int i;
 146     unsigned int opt;
 147     const char *search[] = {NULL, "arch"};
 148
 149     if (f)
 150       fclose (f);
 151
 152     search[0] = argv[0];
 153     for (opt = 0; opt < ARRAY_SIZE (search); opt++)
 154       for (i = 0; i < ARRAY_SIZE (configure_default_options); i++)
 155         if (strcmp (configure_default_options[i].name, search[opt]) == 0)
 156           return concat ("-m", search[opt], "=",
 157                          configure_default_options[i].value, NULL);
 158     return NULL;
 159   }
 160 }