gcc/config/msp430/driver-msp430.c

   1 /* Subroutines for the gcc driver.
   2    Copyright (C) 2015-2022 Free Software Foundation, Inc.
   3    Contributed by Georg-Johann Lay <avr@gjlay.de>
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3, or (at your option)
  10    any later version.
  11
  12    GCC is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GCC; see the file COPYING3.  If not see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #define IN_TARGET_CODE 1
  22
  23 #include "config.h"
  24 #include "system.h"
  25 #include "coretypes.h"
  26 #include "diagnostic.h"
  27 #include "tm.h"
  28 #include "msp430-devices.h"
  29
  30 /* This spec function is called if the user has provided an -mmcu option without
  31    an -mcpu option.  It will place the correct -mcpu option for the given -mmcu
  32    onto the command line, to ensure the correct ISA multilib is selected.  */
  33 const char *
  34 msp430_select_cpu (int argc, const char ** argv)
  35 {
  36   if (argc == 0)
  37     {
  38       error ("expected an argument to %<msp430_select_cpu%>");
  39       return NULL;
  40     }
  41   msp430_extract_mcu_data (argv[0]);
  42   if (extracted_mcu_data.name != NULL)
  43     {
  44       switch (extracted_mcu_data.revision)
  45         {
  46         case 0: return "-mcpu=msp430";
  47         case 1: return "-mcpu=msp430x";
  48         case 2: return "-mcpu=msp430xv2";
  49         default:
  50           gcc_unreachable ();
  51         }
  52     }
  53   /* MCU wasn't found, the compiler proper will warn about this.  */
  54   return NULL;
  55 }
  56
  57 /* Spec function to set a global variable to a specific value in the driver.
  58    The first argument is the variable name, and the second is the value to set
  59    it to.
  60    Currently only "msp430_warn_devices_csv" and "msp430_devices_csv_loc" are
  61    supported.
  62    The intention is that we can take a "Target" option and set the variable
  63    associated with it in the driver as well.  Whilst the driver sees "Target"
  64    options, it does not set the variables associated with that option.  */
  65 const char *
  66 msp430_set_driver_var (int argc, const char ** argv)
  67 {
  68   if (argc != 2)
  69     error ("%<msp430_set_driver_var%> expects 2 arguments");
  70   else if (strcmp (argv[0], "msp430_warn_devices_csv") == 0)
  71     msp430_warn_devices_csv = atoi (argv[1]);
  72   else if (strcmp (argv[0], "msp430_devices_csv_loc") == 0)
  73     msp430_devices_csv_loc = argv[1];
  74   else
  75     error ("unhandled arguments %qs and %qs to %<msp430_set_driver_var%>",
  76            argv[0], argv[1]);
  77   return NULL;
  78 }
  79
  80 /* Implement spec function `msp430_hwmult_lib´.  */
  81
  82 const char *
  83 msp430_select_hwmult_lib (int argc ATTRIBUTE_UNUSED,
  84                           const char ** argv ATTRIBUTE_UNUSED)
  85 {
  86   int i;
  87
  88   switch (argc)
  89     {
  90     case 1:
  91       if (strcasecmp (argv[0], "default"))
  92         error ("unexpected argument to msp430_select_hwmult_lib: %s", argv[0]);
  93       break;
  94
  95     default:
  96       /* We can get three or more arguments passed to this function.
  97          This happens when the same option is repeated on the command line.
  98          For example:
  99          msp430-elf-gcc -mhwmult=none -mhwmult=16bit foo.c
 100          We have to use the last argument as our selector.  */
 101       if (strcasecmp (argv[0], "hwmult") == 0)
 102         {
 103           static struct hwmult_options
 104             {
 105               const char * name;
 106               const char * lib;
 107             } hwmult_options[] =
 108             {
 109               { "none", "-lmul_none" },
 110               { "auto", "-lmul_AUTO" }, /* Should not see this one... */
 111               { "16bit", "-lmul_16" },
 112               { "32bit", "-lmul_32" },
 113               { "f5series", "-lmul_f5" }
 114             };
 115
 116         for (i = ARRAY_SIZE (hwmult_options); i--;)
 117           if (strcasecmp (argv[argc - 1], hwmult_options[i].name) == 0)
 118             return hwmult_options[i].lib;
 119         }
 120       else if (strcasecmp (argv[0], "mcu") == 0)
 121         {
 122           msp430_extract_mcu_data (argv[argc - 1]);
 123           if (extracted_mcu_data.name != NULL)
 124             {
 125               switch (extracted_mcu_data.hwmpy)
 126                 {
 127                 case 0: return "-lmul_none";
 128                 case 2:
 129                 case 1: return "-lmul_16";
 130                 case 4: return "-lmul_32";
 131                 case 8: return "-lmul_f5";
 132                 default:
 133                   /* We have already checked the hwmpy values for
 134                      validity in msp430_extract_mcu_data.  */
 135                   gcc_unreachable ();
 136                   break;
 137                 }
 138             }
 139         }
 140       else
 141         error ("unexpected first argument to msp430_select_hwmult_lib: %s",
 142                argv[0]);
 143       break;
 144
 145     case 0:
 146       error ("msp430_select_hwmult_lib needs one or more arguments");
 147       break;
 148     }
 149
 150   return "-lmul_none";
 151 }
 152
 153 /* Spec function.  Used to place the path to the MSP430-GCC support files
 154    on the command line, prefixed with "-L", so the linker finds the linker
 155    scripts in that directory.  */
 156 const char *
 157 msp430_get_linker_devices_include_path (int argc ATTRIBUTE_UNUSED,
 158                                         const char **argv ATTRIBUTE_UNUSED)
 159 {
 160   char *devices_csv_path;
 161   if (msp430_check_env_var_for_devices (&devices_csv_path))
 162     return NULL;
 163   return concat ("-L", msp430_dirname (devices_csv_path), NULL);
 164 }
 165
 166 /* Spec function.  Propagate -m{code,data}-region= to the linker, unless the
 167    lower region has been specified without -muse-lower-region-prefix also being
 168    used.  */
 169 const char *
 170 msp430_propagate_region_opt (int argc, const char **argv)
 171 {
 172   if (strcmp (argv[0], "lower") != 0)
 173     return argv[0];
 174   else if ((argc == 2) && (strcmp (argv[1], "-muse-lower-region-prefix") == 0))
 175     return argv[0]; /* argv[0] == "lower".  */
 176   return "none";
 177 }