1/* Subroutines for the gcc driver.
2   Copyright (C) 2011-2015 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 3, or (at your option)
9any later version.
10
11GCC is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along 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
26struct vendor_cpu {
27  const char *part_no;
28  const char *arch_name;
29  const char *cpu_name;
30};
31
32static 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", "armv7ve", "cortex-a7"},
41    {"0xc08", "armv7-a", "cortex-a8"},
42    {"0xc09", "armv7-a", "cortex-a9"},
43    {"0xc0d", "armv7ve", "cortex-a12"},
44    {"0xc0e", "armv7ve", "cortex-a17"},
45    {"0xc0f", "armv7ve", "cortex-a15"},
46    {"0xc14", "armv7-r", "cortex-r4"},
47    {"0xc15", "armv7-r", "cortex-r5"},
48    {"0xc20", "armv6-m", "cortex-m0"},
49    {"0xc21", "armv6-m", "cortex-m1"},
50    {"0xc23", "armv7-m", "cortex-m3"},
51    {"0xc24", "armv7e-m", "cortex-m4"},
52    {NULL, NULL, NULL}
53};
54
55static struct {
56  const char *vendor_no;
57  const struct vendor_cpu *vendor_parts;
58} vendors[] = {
59    {"0x41", arm_cpu_table},
60    {NULL, NULL}
61};
62
63/* This will be called by the spec parser in gcc.c when it sees
64   a %:local_cpu_detect(args) construct.  Currently it will be called
65   with either "arch", "cpu" or "tune" as argument depending on if
66   -march=native, -mcpu=native or -mtune=native is to be substituted.
67
68   It returns a string containing new command line parameters to be
69   put at the place of the above two options, depending on what CPU
70   this is executed.  E.g. "-march=armv7-a" on a Cortex-A8 for
71   -march=native.  If the routine can't detect a known processor,
72   the -march or -mtune option is discarded.
73
74   ARGC and ARGV are set depending on the actual arguments given
75   in the spec.  */
76const char *
77host_detect_local_cpu (int argc, const char **argv)
78{
79  const char *val = NULL;
80  char buf[128];
81  FILE *f = NULL;
82  bool arch;
83  const struct vendor_cpu *cpu_table = NULL;
84
85  if (argc < 1)
86    goto not_found;
87
88  arch = strcmp (argv[0], "arch") == 0;
89  if (!arch && strcmp (argv[0], "cpu") != 0 && strcmp (argv[0], "tune"))
90    goto not_found;
91
92  f = fopen ("/proc/cpuinfo", "r");
93  if (f == NULL)
94    goto not_found;
95
96  while (fgets (buf, sizeof (buf), f) != NULL)
97    {
98      /* Ensure that CPU implementer is ARM (0x41).  */
99      if (strncmp (buf, "CPU implementer", sizeof ("CPU implementer") - 1) == 0)
100	{
101	  int i;
102	  for (i = 0; vendors[i].vendor_no != NULL; i++)
103	    if (strstr (buf, vendors[i].vendor_no) != NULL)
104	      {
105		cpu_table = vendors[i].vendor_parts;
106		break;
107	      }
108	}
109
110      /* Detect arch/cpu.  */
111      if (strncmp (buf, "CPU part", sizeof ("CPU part") - 1) == 0)
112	{
113	  int i;
114
115	  if (cpu_table == NULL)
116	    goto not_found;
117
118	  for (i = 0; cpu_table[i].part_no != NULL; i++)
119	    if (strstr (buf, cpu_table[i].part_no) != NULL)
120	      {
121		val = arch ? cpu_table[i].arch_name : cpu_table[i].cpu_name;
122		break;
123	      }
124	  break;
125	}
126    }
127
128  if (val)
129    {
130      fclose (f);
131      return concat ("-m", argv[0], "=", val, NULL);
132     }
133
134not_found:
135  {
136    unsigned int i;
137    unsigned int opt;
138    const char *search[] = {NULL, "arch"};
139
140    if (f)
141      fclose (f);
142
143    search[0] = argv[0];
144    for (opt = 0; opt < ARRAY_SIZE (search); opt++)
145      for (i = 0; i < ARRAY_SIZE (configure_default_options); i++)
146	if (strcmp (configure_default_options[i].name, search[opt]) == 0)
147	  return concat ("-m", search[opt], "=",
148			 configure_default_options[i].value, NULL);
149    return NULL;
150  }
151}
152