gcc/config/avr/gen-avr-mmcu-specs.c

   1 /* Copyright (C) 1998-2016 Free Software Foundation, Inc.
   2    Contributed by Joern Rennecke
   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 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23
  24 #include "config.h"
  25
  26 #define IN_GEN_AVR_MMCU_TEXI
  27
  28 #include "avr-devices.c"
  29
  30 // Get rid of "defaults.h".  We just need tm.h for `WITH_AVRLIBC' and
  31 // and `WITH_RTEMS'.  */
  32 #define GCC_DEFAULTS_H
  33
  34 #include "tm.h"
  35
  36 // Mimic the include order as specified in config.gcc::tm_file.
  37
  38 #include "specs.h"
  39
  40 #if defined (WITH_AVRLIBC)
  41 #include "avrlibc.h"
  42 #endif
  43
  44
  45 #define SPECFILE_DOC_URL                                \
  46   "https://gcc.gnu.org/onlinedocs/gcc/Spec-Files.html"
  47
  48 #define SPECFILE_USAGE_URL                              \
  49   "https://gcc.gnu.org/gcc-5/changes.html"
  50
  51 /* Return true iff STR starts with PREFIX.  */
  52
  53 static bool
  54 str_prefix_p (const char *str, const char *prefix)
  55 {
  56   return 0 == strncmp (str, prefix, strlen (prefix));
  57 }
  58
  59
  60 static const char header[] =
  61   "#\n"
  62   "# Generated by   : ./gcc/config/avr/gen-avr-mmcu-specs.c\n"
  63   "# Generated from : ./gcc/config/gcc.c\n"
  64   "#                  ./gcc/config/avr/specs.h\n"
  65 #if defined (WITH_AVRLIBC)
  66   "#                  ./gcc/config/avr/avrlibc.h\n"
  67 #endif
  68   "# Used by        : avr-gcc compiler driver\n"
  69   "# Used for       : building command options for sub-processes\n"
  70   "#\n"
  71   "# See <" SPECFILE_DOC_URL ">\n"
  72   "# for a documentation of spec files.\n"
  73   "\n";
  74
  75 static const char help_copy_paste[] =
  76   "# If you intend to use an existing device specs file as a starting point\n"
  77   "# for a new device spec file, make sure you are copying from a specs\n"
  78   "# file for a device from the same core architecture and SP width.\n"
  79   "# See <" SPECFILE_USAGE_URL "> for a description\n"
  80   "# of how to use such own spec files.\n";
  81
  82 #if defined (WITH_AVRLIBC)
  83 static const char help_dev_lib_name[] =
  84   "# AVR-LibC's avr/io.h uses the device specifying macro to determine\n"
  85   "# the name of the device header.  For example, -mmcu=atmega8a triggers\n"
  86   "# the definition of __AVR_ATmega8A__ and avr/io.h includes the device\n"
  87   "# header 'iom8a.h' by means of:\n"
  88   "#\n"
  89   "#     ...\n"
  90   "#     #elif defined (__AVR_ATmega8A__)\n"
  91   "#     #  include <avr/iom8a.h>\n"
  92   "#     #elif ...\n"
  93   "# \n"
  94   "# If no device macro is defined, AVR-LibC uses __AVR_DEV_LIB_NAME__\n"
  95   "# as fallback to determine the name of the device header as\n"
  96   "#\n"
  97   "#     \"avr/io\" + __AVR_DEV_LIB_NAME__ + \".h\"\n"
  98   "#\n"
  99   "# If you provide your own specs file for a device not yet known to\n"
 100   "# AVR-LibC, you can now define the hook macro __AVR_DEV_LIB_NAME__\n"
 101   "# as needed so that\n"
 102   "#\n"
 103   "#     #include <avr/io.h>\n"
 104   "#\n"
 105   "# will include the desired device header.  For ATmega8A the supplement\n"
 106   "# to *cpp would read\n"
 107   "#\n"
 108   "#     -D__AVR_DEV_LIB_NAME__=m8a\n"
 109   "\n";
 110 #endif // WITH_AVRLIBC
 111
 112 static void
 113 print_mcu (const avr_mcu_t *mcu)
 114 {
 115   const char *sp8_spec;
 116   const avr_mcu_t *arch_mcu;
 117   const avr_arch_t *arch;
 118   enum avr_arch_id arch_id = mcu->arch_id;
 119
 120   for (arch_mcu = mcu; arch_mcu->macro; )
 121     arch_mcu--;
 122   if (arch_mcu->arch_id != arch_id)
 123     exit (EXIT_FAILURE);
 124
 125   arch = &avr_arch_types[arch_id];
 126
 127   char name[100];
 128   if (snprintf (name, sizeof name, "specs-%s", mcu->name) >= (int) sizeof name)
 129    exit (EXIT_FAILURE);
 130
 131   FILE *f = fopen (name ,"w");
 132
 133   bool errata_skip = 0 != (mcu->dev_attribute & AVR_ERRATA_SKIP);
 134   bool rmw = 0 != (mcu->dev_attribute & AVR_ISA_RMW);
 135   bool sp8 = 0 != (mcu->dev_attribute & AVR_SHORT_SP);
 136   bool is_arch = NULL == mcu->macro;
 137   bool is_device = ! is_arch;
 138
 139   if (is_arch
 140       && (ARCH_AVR2 == arch_id
 141           || ARCH_AVR25 == arch_id))
 142     {
 143       // Leave "avr2" and "avr25" alone.  These two architectures are
 144       // the only ones that mix devices with 8-bit SP and 16-bit SP.
 145       sp8_spec = "";
 146     }
 147   else
 148     {
 149       sp8_spec = sp8 ? "-msp8" :"%<msp8";
 150     }
 151
 152   fprintf (f, "#\n"
 153            "# Auto-generated specs for AVR ");
 154   if (is_arch)
 155     fprintf (f, "core architecture %s\n", arch->name);
 156   else
 157     fprintf (f, "device %s (core %s, %d-bit SP)\n",
 158              mcu->name, arch->name, sp8 ? 8 : 16);
 159   fprintf (f, "%s\n", header);
 160
 161   if (is_device)
 162     fprintf (f, "%s\n", help_copy_paste);
 163
 164 #if defined (WITH_AVRLIBC)
 165   // AVR-LibC specific.  See avrlibc.h for the specs using them as subspecs.
 166
 167   if (is_device)
 168     {
 169       fprintf (f, "*avrlibc_startfile:\n");
 170       fprintf (f, "\tcrt%s.o%%s", mcu->name);
 171       fprintf (f, "\n\n");
 172
 173       fprintf (f, "*avrlibc_devicelib:\n");
 174       fprintf (f, "\t%%{!nodevicelib:-l%s}", mcu->name);
 175       fprintf (f, "\n\n");
 176     }
 177 #endif  // WITH_AVRLIBC
 178
 179   // avr-gcc specific specs for the compilation / the compiler proper.
 180
 181   fprintf (f, "*cc1_n_flash:\n"
 182            "\t%%{!mn-flash=*:-mn-flash=%d}\n\n", mcu->n_flash);
 183
 184   fprintf (f, "*cc1_rmw:\n%s\n\n", rmw
 185            ? "\t%{!mno-rmw: -mrmw}"
 186            : "\t%{mrmw}");
 187
 188   fprintf (f, "*cc1_errata_skip:\n%s\n\n", errata_skip
 189            ? "\t%{!mno-skip-bug: -mskip-bug}"
 190            : "\t%{!mskip-bug: -mno-skip-bug}");
 191
 192   // avr-gcc specific specs for assembling / the assembler.
 193
 194   fprintf (f, "*asm_arch:\n\t-mmcu=%s\n\n", arch->name);
 195
 196 #ifdef HAVE_AS_AVR_MLINK_RELAX_OPTION
 197   fprintf (f, "*asm_relax:\n\t%s\n\n", ASM_RELAX_SPEC);
 198 #endif // have avr-as --mlink-relax
 199
 200 #ifdef HAVE_AS_AVR_MRMW_OPTION
 201   fprintf (f, "*asm_rmw:\n%s\n\n", rmw
 202            ? "\t%{!mno-rmw: -mrmw}"
 203            : "\t%{mrmw}");
 204 #endif // have avr-as -mrmw
 205
 206   fprintf (f, "*asm_errata_skip:\n%s\n\n", errata_skip
 207            ? "\t%{mno-skip-bug}"
 208            : "\t%{!mskip-bug: -mno-skip-bug}");
 209
 210   // avr-specific specs for linking / the linker.
 211
 212   int wrap_k =
 213     str_prefix_p (mcu->name, "at90usb8") ? 8
 214     : str_prefix_p (mcu->name, "atmega16") ? 16
 215     : (str_prefix_p (mcu->name, "atmega32")
 216        || str_prefix_p (mcu->name, "at90can32")) ? 32
 217     : (str_prefix_p (mcu->name, "atmega64")
 218        || str_prefix_p (mcu->name, "at90can64")
 219        || str_prefix_p (mcu->name, "at90usb64")) ? 64
 220     : 0;
 221
 222   fprintf (f, "*link_pmem_wrap:\n");
 223   if (wrap_k)
 224     fprintf (f, "\t%%{mpmem-wrap-around: --pmem-wrap-around=%dk}", wrap_k);
 225   fprintf (f, "\n\n");
 226
 227   fprintf (f, "*link_relax:\n\t%s\n\n", LINK_RELAX_SPEC);
 228
 229   fprintf (f, "*link_arch:\n\t%s\n\n", LINK_ARCH_SPEC);
 230
 231   if (is_device)
 232     {
 233       fprintf (f, "*link_data_start:\n");
 234       if (mcu->data_section_start
 235           != arch->default_data_section_start)
 236         fprintf (f, "\t%%{!Tdata:-Tdata 0x%lX}",
 237                  0x800000UL + mcu->data_section_start);
 238       fprintf (f, "\n\n");
 239
 240       fprintf (f, "*link_text_start:\n");
 241       if (mcu->text_section_start != 0x0)
 242         fprintf (f, "\t%%{!Ttext:-Ttext 0x%lX}", 0UL + mcu->text_section_start);
 243       fprintf (f, "\n\n");
 244     }
 245
 246   // Specs known to GCC.
 247
 248   if (is_device)
 249     {
 250       fprintf (f, "*self_spec:\n");
 251       fprintf (f, "\t%%{!mmcu=avr*: %%<mmcu=* -mmcu=%s} ", arch->name);
 252       fprintf (f, "%s\n\n", sp8_spec);
 253
 254 #if defined (WITH_AVRLIBC)
 255       fprintf (f, "%s\n", help_dev_lib_name);
 256 #endif // WITH_AVRLIBC
 257
 258       fprintf (f, "*cpp:\n");
 259       fprintf (f, "\t-D%s -D__AVR_DEVICE_NAME__=%s", mcu->macro, mcu->name);
 260       fprintf (f, "\n\n");
 261     }
 262
 263   fprintf (f, "# End of file\n");
 264
 265   fclose (f);
 266 }
 267
 268
 269 int main (void)
 270 {
 271   for (const avr_mcu_t *mcu = avr_mcu_types; mcu->name; mcu++)
 272     print_mcu (mcu);
 273
 274   return EXIT_SUCCESS;
 275 }