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/* Subroutines for the gcc driver.

   Copyright (C) 2011 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 3, or (at your option)

any later version.

GCC is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with GCC; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.  */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include "configargs.h"

struct vendor_cpu {

  const char *part_no;

  const char *arch_name;

  const char *cpu_name;

};

static struct vendor_cpu arm_cpu_table[] = {

    {"0x926", "armv5te", "arm926ej-s"},

    {"0xa26", "armv5te", "arm1026ej-s"},

    {"0xb02", "armv6k", "mpcore"},

    {"0xb36", "armv6j", "arm1136j-s"},

    {"0xb56", "armv6t2", "arm1156t2-s"},

    {"0xb76", "armv6zk", "arm1176jz-s"},

    {"0xc05", "armv7-a", "cortex-a5"},

    {"0xc08", "armv7-a", "cortex-a8"},

    {"0xc09", "armv7-a", "cortex-a9"},

    {"0xc0f", "armv7-a", "cortex-a15"},

    {"0xc14", "armv7-r", "cortex-r4"},

    {"0xc15", "armv7-r", "cortex-r5"},

    {"0xc20", "armv6-m", "cortex-m0"},

    {"0xc21", "armv6-m", "cortex-m1"},

    {"0xc23", "armv7-m", "cortex-m3"},

    {"0xc24", "armv7e-m", "cortex-m4"},

    {NULL, NULL, NULL}

};

static struct {

  const char *vendor_no;

  const struct vendor_cpu *vendor_parts;

} vendors[] = {

    {"0x41", arm_cpu_table},

    {NULL, NULL}

};

/* This will be called by the spec parser in gcc.c when it sees

   a %:local_cpu_detect(args) construct.  Currently it will be called

   with either "arch", "cpu" or "tune" as argument depending on if

   -march=native, -mcpu=native or -mtune=native is to be substituted.

   It returns a string containing new command line parameters to be

   put at the place of the above two options, depending on what CPU

   this is executed.  E.g. "-march=armv7-a" on a Cortex-A8 for

   -march=native.  If the routine can't detect a known processor,

   the -march or -mtune option is discarded.

   ARGC and ARGV are set depending on the actual arguments given

   in the spec.  */

const char *

host_detect_local_cpu (int argc, const char **argv)

{

  const char *val = NULL;

  char buf[128];

  FILE *f = NULL;

  bool arch;

  const struct vendor_cpu *cpu_table = NULL;

  if (argc < 1)

    goto not_found;

  arch = strcmp (argv[0], "arch") == 0;

  if (!arch && strcmp (argv[0], "cpu") != 0 && strcmp (argv[0], "tune"))

    goto not_found;

  f = fopen ("/proc/cpuinfo", "r");

  if (f == NULL)

    goto not_found;

  while (fgets (buf, sizeof (buf), f) != NULL)

    {

      /* Ensure that CPU implementer is ARM (0x41).  */

      if (strncmp (buf, "CPU implementer", sizeof ("CPU implementer") - 1) == 0)

        {

          int i;

          for (i = 0; vendors[i].vendor_no != NULL; i++)

            if (strstr (buf, vendors[i].vendor_no) != NULL)

              {

                cpu_table = vendors[i].vendor_parts;

                break;

              }

        }

      /* Detect arch/cpu.  */

      if (strncmp (buf, "CPU part", sizeof ("CPU part") - 1) == 0)

        {

          int i;

          if (cpu_table == NULL)

            goto not_found;

          for (i = 0; cpu_table[i].part_no != NULL; i++)

            if (strstr (buf, cpu_table[i].part_no) != NULL)

              {

                val = arch ? cpu_table[i].arch_name : cpu_table[i].cpu_name;

                break;

              }

          break;

        }

    }

  fclose (f);

  if (val == NULL)

    goto not_found;

  return concat ("-m", argv[0], "=", val, NULL);

not_found:

  {

    unsigned int i;

    unsigned int opt;

    const char *search[] = {NULL, "arch"};

    if (f)

      fclose (f);

    search[0] = argv[0];

    for (opt = 0; opt < ARRAY_SIZE (search); opt++)

      for (i = 0; i < ARRAY_SIZE (configure_default_options); i++)

        if (strcmp (configure_default_options[i].name, search[opt]) == 0)

          return concat ("-m", search[opt], "=",

                         configure_default_options[i].value, NULL);

    return NULL;

  }

}