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     {"0xd0b", "armv8.2-a+fp16+dotprod", "cortex-a76"},
  60     {"0xc14", "armv7-r", "cortex-r4"},
  61     {"0xc15", "armv7-r", "cortex-r5"},
  62     {"0xc17", "armv7-r", "cortex-r7"},
  63     {"0xc18", "armv7-r", "cortex-r8"},
  64     {"0xd13", "armv8-r+crc", "cortex-r52"},
  65     {"0xc20", "armv6-m", "cortex-m0"},
  66     {"0xc21", "armv6-m", "cortex-m1"},
  67     {"0xc23", "armv7-m", "cortex-m3"},
  68     {"0xc24", "armv7e-m", "cortex-m4"},
  69     {NULL, NULL, NULL}
  70 };
  71
  72 static struct {
  73   const char *vendor_no;
  74   const struct vendor_cpu *vendor_parts;
  75 } vendors[] = {
  76     {"0x41", arm_cpu_table},
  77     {NULL, NULL}
  78 };
  79
  80 /* This will be called by the spec parser in gcc.c when it sees
  81    a %:local_cpu_detect(args) construct.  Currently it will be called
  82    with either "arch", "cpu" or "tune" as argument depending on if
  83    -march=native, -mcpu=native or -mtune=native is to be substituted.
  84
  85    It returns a string containing new command line parameters to be
  86    put at the place of the above two options, depending on what CPU
  87    this is executed.  E.g. "-march=armv7-a" on a Cortex-A8 for
  88    -march=native.  If the routine can't detect a known processor,
  89    the -march or -mtune option is discarded.
  90
  91    ARGC and ARGV are set depending on the actual arguments given
  92    in the spec.  */
  93 const char *
  94 host_detect_local_cpu (int argc, const char **argv)
  95 {
  96   const char *val = NULL;
  97   char buf[128];
  98   FILE *f = NULL;
  99   bool arch;
 100   const struct vendor_cpu *cpu_table = NULL;
 101
 102   if (argc < 1)
 103     goto not_found;
 104
 105   arch = strcmp (argv[0], "arch") == 0;
 106   if (!arch && strcmp (argv[0], "cpu") != 0 && strcmp (argv[0], "tune"))
 107     goto not_found;
 108
 109   f = fopen ("/proc/cpuinfo", "r");
 110   if (f == NULL)
 111     goto not_found;
 112
 113   while (fgets (buf, sizeof (buf), f) != NULL)
 114     {
 115       /* Ensure that CPU implementer is ARM (0x41).  */
 116       if (strncmp (buf, "CPU implementer", sizeof ("CPU implementer") - 1) == 0)
 117         {
 118           int i;
 119           for (i = 0; vendors[i].vendor_no != NULL; i++)
 120             if (strstr (buf, vendors[i].vendor_no) != NULL)
 121               {
 122                 cpu_table = vendors[i].vendor_parts;
 123                 break;
 124               }
 125         }
 126
 127       /* Detect arch/cpu.  */
 128       if (strncmp (buf, "CPU part", sizeof ("CPU part") - 1) == 0)
 129         {
 130           int i;
 131
 132           if (cpu_table == NULL)
 133             goto not_found;
 134
 135           for (i = 0; cpu_table[i].part_no != NULL; i++)
 136             if (strstr (buf, cpu_table[i].part_no) != NULL)
 137               {
 138                 val = arch ? cpu_table[i].arch_name : cpu_table[i].cpu_name;
 139                 break;
 140               }
 141           break;
 142         }
 143     }
 144
 145   if (val)
 146     {
 147       fclose (f);
 148       return concat ("-m", argv[0], "=", val, NULL);
 149      }
 150
 151 not_found:
 152   {
 153     unsigned int i;
 154     unsigned int opt;
 155     const char *search[] = {NULL, "arch"};
 156
 157     if (f)
 158       fclose (f);
 159
 160     search[0] = argv[0];
 161     for (opt = 0; opt < ARRAY_SIZE (search); opt++)
 162       for (i = 0; i < ARRAY_SIZE (configure_default_options); i++)
 163         if (strcmp (configure_default_options[i].name, search[opt]) == 0)
 164           return concat ("-m", search[opt], "=",
 165                          configure_default_options[i].value, NULL);
 166     return NULL;
 167   }
 168 }