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   const char *part_no;
  30   const char *arch_name;
  31   const char *cpu_name;
  32 };
  33
  34 static struct vendor_cpu arm_cpu_table[] = {
  35     {"0x926", "armv5te", "arm926ej-s"},
  36     {"0xa26", "armv5te", "arm1026ej-s"},
  37     {"0xb02", "armv6k", "mpcore"},
  38     {"0xb36", "armv6j", "arm1136jf-s"},
  39     {"0xb56", "armv6t2", "arm1156t2f-s"},
  40     /* armv6kz is the correct spelling for ARMv6KZ but may not be supported in
  41        the version of binutils used.  The incorrect spelling is supported in
  42        legacy and current binutils so that is used instead.  */
  43     {"0xb76", "armv6zk", "arm1176jzf-s"},
  44     {"0xc05", "armv7-a", "cortex-a5"},
  45     {"0xc07", "armv7ve", "cortex-a7"},
  46     {"0xc08", "armv7-a", "cortex-a8"},
  47     {"0xc09", "armv7-a", "cortex-a9"},
  48     {"0xc0d", "armv7ve", "cortex-a12"},
  49     {"0xc0e", "armv7ve", "cortex-a17"},
  50     {"0xc0f", "armv7ve", "cortex-a15"},
  51     {"0xd01", "armv8-a+crc", "cortex-a32"},
  52     {"0xd04", "armv8-a+crc", "cortex-a35"},
  53     {"0xd03", "armv8-a+crc", "cortex-a53"},
  54     {"0xd07", "armv8-a+crc", "cortex-a57"},
  55     {"0xd08", "armv8-a+crc", "cortex-a72"},
  56     {"0xd09", "armv8-a+crc", "cortex-a73"},
  57     {"0xd05", "armv8.2-a+fp16+dotprod", "cortex-a55"},
  58     {"0xd0a", "armv8.2-a+fp16+dotprod", "cortex-a75"},
  59     {"0xc14", "armv7-r", "cortex-r4"},
  60     {"0xc15", "armv7-r", "cortex-r5"},
  61     {"0xc17", "armv7-r", "cortex-r7"},
  62     {"0xc18", "armv7-r", "cortex-r8"},
  63     {"0xd13", "armv8-r+crc", "cortex-r52"},
  64     {"0xc20", "armv6-m", "cortex-m0"},
  65     {"0xc21", "armv6-m", "cortex-m1"},
  66     {"0xc23", "armv7-m", "cortex-m3"},
  67     {"0xc24", "armv7e-m", "cortex-m4"},
  68     {NULL, NULL, NULL}
  69 };
  70
  71 static struct {
  72   const char *vendor_no;
  73   const struct vendor_cpu *vendor_parts;
  74 } vendors[] = {
  75     {"0x41", arm_cpu_table},
  76     {NULL, NULL}
  77 };
  78
  79 /* This will be called by the spec parser in gcc.c when it sees
  80    a %:local_cpu_detect(args) construct.  Currently it will be called
  81    with either "arch", "cpu" or "tune" as argument depending on if
  82    -march=native, -mcpu=native or -mtune=native is to be substituted.
  83
  84    It returns a string containing new command line parameters to be
  85    put at the place of the above two options, depending on what CPU
  86    this is executed.  E.g. "-march=armv7-a" on a Cortex-A8 for
  87    -march=native.  If the routine can't detect a known processor,
  88    the -march or -mtune option is discarded.
  89
  90    ARGC and ARGV are set depending on the actual arguments given
  91    in the spec.  */
  92 const char *
  93 host_detect_local_cpu (int argc, const char **argv)
  94 {
  95   const char *val = NULL;
  96   char buf[128];
  97   FILE *f = NULL;
  98   bool arch;
  99   const struct vendor_cpu *cpu_table = NULL;
 100
 101   if (argc < 1)
 102     goto not_found;
 103
 104   arch = strcmp (argv[0], "arch") == 0;
 105   if (!arch && strcmp (argv[0], "cpu") != 0 && strcmp (argv[0], "tune"))
 106     goto not_found;
 107
 108   f = fopen ("/proc/cpuinfo", "r");
 109   if (f == NULL)
 110     goto not_found;
 111
 112   while (fgets (buf, sizeof (buf), f) != NULL)
 113     {
 114       /* Ensure that CPU implementer is ARM (0x41).  */
 115       if (strncmp (buf, "CPU implementer", sizeof ("CPU implementer") - 1) == 0)
 116         {
 117           int i;
 118           for (i = 0; vendors[i].vendor_no != NULL; i++)
 119             if (strstr (buf, vendors[i].vendor_no) != NULL)
 120               {
 121                 cpu_table = vendors[i].vendor_parts;
 122                 break;
 123               }
 124         }
 125
 126       /* Detect arch/cpu.  */
 127       if (strncmp (buf, "CPU part", sizeof ("CPU part") - 1) == 0)
 128         {
 129           int i;
 130
 131           if (cpu_table == NULL)
 132             goto not_found;
 133
 134           for (i = 0; cpu_table[i].part_no != NULL; i++)
 135             if (strstr (buf, cpu_table[i].part_no) != NULL)
 136               {
 137                 val = arch ? cpu_table[i].arch_name : cpu_table[i].cpu_name;
 138                 break;
 139               }
 140           break;
 141         }
 142     }
 143
 144   if (val)
 145     {
 146       fclose (f);
 147       return concat ("-m", argv[0], "=", val, NULL);
 148      }
 149
 150 not_found:
 151   {
 152     unsigned int i;
 153     unsigned int opt;
 154     const char *search[] = {NULL, "arch"};
 155
 156     if (f)
 157       fclose (f);
 158
 159     search[0] = argv[0];
 160     for (opt = 0; opt < ARRAY_SIZE (search); opt++)
 161       for (i = 0; i < ARRAY_SIZE (configure_default_options); i++)
 162         if (strcmp (configure_default_options[i].name, search[opt]) == 0)
 163           return concat ("-m", search[opt], "=",
 164                          configure_default_options[i].value, NULL);
 165     return NULL;
 166   }
 167 }