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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;
}
}
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