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

   1 /* Copyright (C) 1998-2015 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_AVRLIBS' 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 #if defined (WITH_RTEMS)
  45 #include "../rtems.h"
  46 #include "rtems.h"
  47 #endif
  48
  49
  50 #define SPECFILE_DOC_URL                                \
  51   "https://gcc.gnu.org/onlinedocs/gcc/Spec-Files.html"
  52
  53 #define SPECFILE_USAGE_URL                              \
  54   "https://gcc.gnu.org/gcc-5/changes.html"
  55
  56 /* Return true iff STR starts with PREFIX.  */
  57
  58 static bool
  59 str_prefix_p (const char *str, const char *prefix)
  60 {
  61   return 0 == strncmp (str, prefix, strlen (prefix));
  62 }
  63
  64
  65 static const char header[] =
  66   "#\n"
  67   "# Generated by   : ./gcc/config/avr/gen-avr-mmcu-specs.c\n"
  68   "# Generated from : ./gcc/config/gcc.c\n"
  69   "#                  ./gcc/config/avr/specs.h\n"
  70 #if defined (WITH_RTEMS)
  71   "#                  ./gcc/config/rtems.h\n"
  72   "#                  ./gcc/config/avr/rtems.h\n"
  73 #endif
  74 #if defined (WITH_AVRLIBC)
  75   "#                  ./gcc/config/avr/avrlibc.h\n"
  76 #endif
  77   "# Used by        : avr-gcc compiler driver\n"
  78   "# Used for       : building command options for sub-processes\n"
  79   "#\n"
  80   "# See <" SPECFILE_DOC_URL ">\n"
  81   "# for a documentation of spec files.\n"
  82   "\n";
  83
  84 static const char help_copy_paste[] =
  85   "# If you intend to use an existing device specs file as a starting point\n"
  86   "# for a new device spec file, make sure you are copying from a specs\n"
  87   "# file for a device from the same core architecture and SP width.\n"
  88   "# See <" SPECFILE_USAGE_URL "> for a description\n"
  89   "# of how to use such own spec files.\n";
  90
  91 #if defined (WITH_AVRLIBC)
  92 static const char help_dev_lib_name[] =
  93   "# AVR-LibC's avr/io.h uses the device specifying macro to determine\n"
  94   "# the name of the device header.  For example, -mmcu=atmega8a triggers\n"
  95   "# the definition of __AVR_ATmega8A__ and avr/io.h includes the device\n"
  96   "# header 'iom8a.h' by means of:\n"
  97   "#\n"
  98   "#     ...\n"
  99   "#     #elif defined (__AVR_ATmega8A__)\n"
 100   "#     #  include <avr/iom8a.h>\n"
 101   "#     #elif ...\n"
 102   "# \n"
 103   "# If no device macro is defined, AVR-LibC uses __AVR_DEV_LIB_NAME__\n"
 104   "# as fallback to determine the name of the device header as\n"
 105   "#\n"
 106   "#     \"avr/io\" + __AVR_DEV_LIB_NAME__ + \".h\"\n"
 107   "#\n"
 108   "# If you provide your own specs file for a device not yet known to\n"
 109   "# AVR-LibC, you can now define the hook macro __AVR_DEV_LIB_NAME__\n"
 110   "# as needed so that\n"
 111   "#\n"
 112   "#     #include <avr/io.h>\n"
 113   "#\n"
 114   "# will include the desired device header.  For ATmega8A the supplement\n"
 115   "# to *cpp would read\n"
 116   "#\n"
 117   "#     -D__AVR_DEV_LIB_NAME__=m8a\n"
 118   "\n";
 119 #endif // WITH_AVRLIBC
 120
 121 static void
 122 print_mcu (const avr_mcu_t *mcu)
 123 {
 124   const char *sp8_spec;
 125   const avr_mcu_t *arch_mcu;
 126   const avr_arch_t *arch;
 127   enum avr_arch_id arch_id = mcu->arch_id;
 128
 129   for (arch_mcu = mcu; arch_mcu->macro; )
 130     arch_mcu--;
 131   if (arch_mcu->arch_id != arch_id)
 132     exit (EXIT_FAILURE);
 133
 134   arch = &avr_arch_types[arch_id];
 135
 136   char name[100];
 137   if (snprintf (name, sizeof name, "specs-%s", mcu->name) >= (int) sizeof name)
 138    exit (EXIT_FAILURE);
 139
 140   FILE *f = fopen (name ,"w");
 141
 142   bool errata_skip = 0 != (mcu->dev_attribute & AVR_ERRATA_SKIP);
 143   bool rmw = 0 != (mcu->dev_attribute & AVR_ISA_RMW);
 144   bool sp8 = 0 != (mcu->dev_attribute & AVR_SHORT_SP);
 145   bool is_arch = NULL == mcu->macro;
 146   bool is_device = ! is_arch;
 147
 148   if (is_arch
 149       && (ARCH_AVR2 == arch_id
 150           || ARCH_AVR25 == arch_id))
 151     {
 152       // Leave "avr2" and "avr25" alone.  These two architectures are
 153       // the only ones that mix devices with 8-bit SP and 16-bit SP.
 154       sp8_spec = "";
 155     }
 156   else
 157     {
 158       sp8_spec = sp8 ? "-msp8" :"%<msp8";
 159     }
 160
 161   fprintf (f, "#\n"
 162            "# Auto-generated specs for AVR ");
 163   if (is_arch)
 164     fprintf (f, "core architecture %s\n", arch->name);
 165   else
 166     fprintf (f, "device %s (core %s, %d-bit SP)\n",
 167              mcu->name, arch->name, sp8 ? 8 : 16);
 168   fprintf (f, "%s\n", header);
 169
 170   if (is_device)
 171     fprintf (f, "%s\n", help_copy_paste);
 172
 173 #if defined (WITH_AVRLIBC)
 174   // AVR-LibC specific.  See avrlibc.h for the specs using them as subspecs.
 175
 176   if (is_device)
 177     {
 178       fprintf (f, "*avrlibc_startfile:\n");
 179       fprintf (f, "\tcrt%s.o%%s", mcu->name);
 180       fprintf (f, "\n\n");
 181
 182       fprintf (f, "*avrlibc_devicelib:\n");
 183       fprintf (f, "\t%%{!nodevicelib:-l%s}", mcu->name);
 184       fprintf (f, "\n\n");
 185     }
 186 #endif  // WITH_AVRLIBC
 187
 188   // avr-gcc specific specs for the compilation / the compiler proper.
 189
 190   fprintf (f, "*cc1_n_flash:\n"
 191            "\t%%{!mn-flash=*:-mn-flash=%d}\n\n", mcu->n_flash);
 192
 193   fprintf (f, "*cc1_rmw:\n%s\n\n", rmw
 194            ? "\t%{!mno-rmw: -mrmw}"
 195            : "\t%{mrmw}");
 196
 197   fprintf (f, "*cc1_errata_skip:\n%s\n\n", errata_skip
 198            ? "\t%{!mno-skip-bug: -mskip-bug}"
 199            : "\t%{!mskip-bug: -mno-skip-bug}");
 200
 201   // avr-gcc specific specs for assembling / the assembler.
 202
 203   fprintf (f, "*asm_arch:\n\t-mmcu=%s\n\n", arch->name);
 204
 205 #ifdef HAVE_AS_AVR_MLINK_RELAX_OPTION
 206   fprintf (f, "*asm_relax:\n\t%s\n\n", ASM_RELAX_SPEC);
 207 #endif // have avr-as --mlink-relax
 208
 209 #ifdef HAVE_AS_AVR_MRMW_OPTION
 210   fprintf (f, "*asm_rmw:\n%s\n\n", rmw
 211            ? "\t%{!mno-rmw: -mrmw}"
 212            : "\t%{mrmw}");
 213 #endif // have avr-as -mrmw
 214
 215   fprintf (f, "*asm_errata_skip:\n%s\n\n", errata_skip
 216            ? "\t%{mno-skip-bug}"
 217            : "\t%{!mskip-bug: -mno-skip-bug}");
 218
 219   // avr-specific specs for linking / the linker.
 220
 221   int wrap_k =
 222     str_prefix_p (mcu->name, "at90usb8") ? 8
 223     : str_prefix_p (mcu->name, "atmega16") ? 16
 224     : (str_prefix_p (mcu->name, "atmega32")
 225        || str_prefix_p (mcu->name, "at90can32")) ? 32
 226     : (str_prefix_p (mcu->name, "atmega64")
 227        || str_prefix_p (mcu->name, "at90can64")
 228        || str_prefix_p (mcu->name, "at90usb64")) ? 64
 229     : 0;
 230
 231   fprintf (f, "*link_pmem_wrap:\n");
 232   if (wrap_k)
 233     fprintf (f, "\t%%{mpmem-wrap-around: --pmem-wrap-around=%dk}", wrap_k);
 234   fprintf (f, "\n\n");
 235
 236   fprintf (f, "*link_relax:\n\t%s\n\n", LINK_RELAX_SPEC);
 237
 238   fprintf (f, "*link_arch:\n\t%s\n\n", LINK_ARCH_SPEC);
 239
 240   if (is_device)
 241     {
 242       fprintf (f, "*link_data_start:\n");
 243       if (mcu->data_section_start
 244           != arch->default_data_section_start)
 245         fprintf (f, "\t-Tdata 0x%lX", 0x800000UL + mcu->data_section_start);
 246       fprintf (f, "\n\n");
 247
 248       fprintf (f, "*link_text_start:\n");
 249       if (mcu->text_section_start != 0x0)
 250         fprintf (f, "\t-Ttext 0x%lX", 0UL + mcu->text_section_start);
 251       fprintf (f, "\n\n");
 252     }
 253
 254   // Specs known to GCC.
 255
 256   if (is_device)
 257     {
 258       fprintf (f, "*self_spec:\n");
 259       fprintf (f, "\t%%{!mmcu=avr*: %%<mmcu=* -mmcu=%s} ", arch->name);
 260       fprintf (f, "%s\n\n", sp8_spec);
 261
 262 #if defined (WITH_AVRLIBC)
 263       fprintf (f, "%s\n", help_dev_lib_name);
 264 #endif // WITH_AVRLIBC
 265
 266       fprintf (f, "*cpp:\n");
 267       fprintf (f, "\t-D%s -D__AVR_DEVICE_NAME__=%s", mcu->macro, mcu->name);
 268       fprintf (f, "\n\n");
 269     }
 270
 271   fprintf (f, "# End of file\n");
 272
 273   fclose (f);
 274 }
 275
 276
 277 int main (void)
 278 {
 279   for (const avr_mcu_t *mcu = avr_mcu_types; mcu->name; mcu++)
 280     print_mcu (mcu);
 281
 282   return EXIT_SUCCESS;
 283 }