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

   1 /* Copyright (C) 1998-2017 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 #define IN_TARGET_CODE 1
  25
  26 #include "config.h"
  27
  28 #define IN_GEN_AVR_MMCU_TEXI
  29
  30 #include "avr-devices.c"
  31
  32 // Get rid of "defaults.h".  We just need tm.h for `WITH_AVRLIBC' and
  33 // and `WITH_RTEMS'.  */
  34 #define GCC_DEFAULTS_H
  35
  36 #include "tm.h"
  37
  38 // Mimic the include order as specified in config.gcc::tm_file.
  39
  40 #include "specs.h"
  41
  42 #if defined (WITH_AVRLIBC)
  43 #include "avrlibc.h"
  44 #endif
  45
  46
  47 #define SPECFILE_DOC_URL                                \
  48   "https://gcc.gnu.org/onlinedocs/gcc/Spec-Files.html"
  49
  50 #define SPECFILE_USAGE_URL                              \
  51   "https://gcc.gnu.org/gcc-5/changes.html"
  52
  53 /* Return true iff STR starts with PREFIX.  */
  54
  55 static bool
  56 str_prefix_p (const char *str, const char *prefix)
  57 {
  58   return strncmp (str, prefix, strlen (prefix)) == 0;
  59 }
  60
  61
  62 static const char header[] =
  63   "#\n"
  64   "# Generated by   : ./gcc/config/avr/gen-avr-mmcu-specs.c\n"
  65   "# Generated from : ./gcc/config/gcc.c\n"
  66   "#                  ./gcc/config/avr/specs.h\n"
  67 #if defined (WITH_AVRLIBC)
  68   "#                  ./gcc/config/avr/avrlibc.h\n"
  69 #endif
  70   "# Used by        : avr-gcc compiler driver\n"
  71   "# Used for       : building command options for sub-processes\n"
  72   "#\n"
  73   "# See <" SPECFILE_DOC_URL ">\n"
  74   "# for a documentation of spec files.\n"
  75   "\n";
  76
  77 static const char help_copy_paste[] =
  78   "# If you intend to use an existing device specs file as a starting point\n"
  79   "# for a new device spec file, make sure you are copying from a specs\n"
  80   "# file for a device from the same core architecture and SP width.\n"
  81   "# See <" SPECFILE_USAGE_URL "> for a description\n"
  82   "# of how to use such own spec files.\n";
  83
  84 #if defined (WITH_AVRLIBC)
  85 static const char help_dev_lib_name[] =
  86   "# AVR-LibC's avr/io.h uses the device specifying macro to determine\n"
  87   "# the name of the device header.  For example, -mmcu=atmega8a triggers\n"
  88   "# the definition of __AVR_ATmega8A__ and avr/io.h includes the device\n"
  89   "# header 'iom8a.h' by means of:\n"
  90   "#\n"
  91   "#     ...\n"
  92   "#     #elif defined (__AVR_ATmega8A__)\n"
  93   "#     #  include <avr/iom8a.h>\n"
  94   "#     #elif ...\n"
  95   "# \n"
  96   "# If no device macro is defined, AVR-LibC uses __AVR_DEV_LIB_NAME__\n"
  97   "# as fallback to determine the name of the device header as\n"
  98   "#\n"
  99   "#     \"avr/io\" + __AVR_DEV_LIB_NAME__ + \".h\"\n"
 100   "#\n"
 101   "# If you provide your own specs file for a device not yet known to\n"
 102   "# AVR-LibC, you can now define the hook macro __AVR_DEV_LIB_NAME__\n"
 103   "# as needed so that\n"
 104   "#\n"
 105   "#     #include <avr/io.h>\n"
 106   "#\n"
 107   "# will include the desired device header.  For ATmega8A the supplement\n"
 108   "# to *cpp would read\n"
 109   "#\n"
 110   "#     -D__AVR_DEV_LIB_NAME__=m8a\n"
 111   "\n";
 112 #endif // WITH_AVRLIBC
 113
 114 static void
 115 print_mcu (const avr_mcu_t *mcu)
 116 {
 117   const char *sp8_spec;
 118   const char *rcall_spec;
 119   const avr_mcu_t *arch_mcu;
 120   const avr_arch_t *arch;
 121   enum avr_arch_id arch_id = mcu->arch_id;
 122
 123   for (arch_mcu = mcu; arch_mcu->macro; )
 124     arch_mcu--;
 125   if (arch_mcu->arch_id != arch_id)
 126     exit (EXIT_FAILURE);
 127
 128   arch = &avr_arch_types[arch_id];
 129
 130   char name[100];
 131   if (snprintf (name, sizeof name, "specs-%s", mcu->name) >= (int) sizeof name)
 132    exit (EXIT_FAILURE);
 133
 134   FILE *f = fopen (name ,"w");
 135
 136   bool absdata = (mcu->dev_attribute & AVR_ISA_LDS) != 0;
 137   bool errata_skip = (mcu->dev_attribute & AVR_ERRATA_SKIP) != 0;
 138   bool rmw = (mcu->dev_attribute & AVR_ISA_RMW) != 0;
 139   bool sp8 = (mcu->dev_attribute & AVR_SHORT_SP) != 0;
 140   bool rcall = (mcu->dev_attribute & AVR_ISA_RCALL);
 141   bool is_arch = mcu->macro == NULL;
 142   bool is_device = ! is_arch;
 143
 144   if (is_arch
 145       && (ARCH_AVR2 == arch_id
 146           || ARCH_AVR25 == arch_id))
 147     {
 148       // Leave "avr2" and "avr25" alone.  These two architectures are
 149       // the only ones that mix devices with 8-bit SP and 16-bit SP.
 150       sp8_spec = "";
 151     }
 152   else
 153     {
 154       sp8_spec = sp8 ? "-msp8" :"%<msp8";
 155     }
 156
 157   if (is_arch
 158       && ARCH_AVRXMEGA3 == arch_id)
 159     {
 160       // Leave "avrxmega3" alone.  This architectures is the only one
 161       // that mixes devices with and without JMP / CALL.
 162       rcall_spec = "";
 163     }
 164   else
 165     {
 166       rcall_spec = rcall ? "-mshort-calls" : "%<mshort-calls";
 167     }
 168
 169   fprintf (f, "#\n"
 170            "# Auto-generated specs for AVR ");
 171   if (is_arch)
 172     fprintf (f, "core architecture %s\n", arch->name);
 173   else
 174     fprintf (f, "device %s (core %s, %d-bit SP%s)\n", mcu->name,
 175              arch->name, sp8 ? 8 : 16, rcall ? ", short-calls" : "");
 176   fprintf (f, "%s\n", header);
 177
 178   if (is_device)
 179     fprintf (f, "%s\n", help_copy_paste);
 180
 181 #if defined (WITH_AVRLIBC)
 182   // AVR-LibC specific.  See avrlibc.h for the specs using them as subspecs.
 183
 184   if (is_device)
 185     {
 186       fprintf (f, "*avrlibc_startfile:\n");
 187       fprintf (f, "\tcrt%s.o%%s", mcu->name);
 188       fprintf (f, "\n\n");
 189
 190       fprintf (f, "*avrlibc_devicelib:\n");
 191       fprintf (f, "\t%%{!nodevicelib:-l%s}", mcu->name);
 192       fprintf (f, "\n\n");
 193     }
 194 #endif  // WITH_AVRLIBC
 195
 196   // avr-gcc specific specs for the compilation / the compiler proper.
 197
 198   int n_flash = 1 + (mcu->flash_size - 1) / 0x10000;
 199
 200   fprintf (f, "*cc1_n_flash:\n"
 201            "\t%%{!mn-flash=*:-mn-flash=%d}\n\n", n_flash);
 202
 203   fprintf (f, "*cc1_rmw:\n%s\n\n", rmw
 204            ? "\t%{!mno-rmw: -mrmw}"
 205            : "\t%{mrmw}");
 206
 207   fprintf (f, "*cc1_errata_skip:\n%s\n\n", errata_skip
 208            ? "\t%{!mno-skip-bug: -mskip-bug}"
 209            : "\t%{!mskip-bug: -mno-skip-bug}");
 210
 211   fprintf (f, "*cc1_absdata:\n%s\n\n", absdata
 212            ? "\t%{!mno-absdata: -mabsdata}"
 213            : "\t%{mabsdata}");
 214
 215   // avr-gcc specific specs for assembling / the assembler.
 216
 217   fprintf (f, "*asm_arch:\n\t-mmcu=%s\n\n", arch->name);
 218
 219 #ifdef HAVE_AS_AVR_MLINK_RELAX_OPTION
 220   fprintf (f, "*asm_relax:\n\t%s\n\n", ASM_RELAX_SPEC);
 221 #endif // have avr-as --mlink-relax
 222
 223 #ifdef HAVE_AS_AVR_MRMW_OPTION
 224   fprintf (f, "*asm_rmw:\n%s\n\n", rmw
 225            ? "\t%{!mno-rmw: -mrmw}"
 226            : "\t%{mrmw}");
 227 #endif // have avr-as -mrmw
 228
 229 #ifdef HAVE_AS_AVR_MGCCISR_OPTION
 230   fprintf (f, "*asm_gccisr:\n%s\n\n",
 231            "\t%{!mno-gas-isr-prologues: -mgcc-isr}");
 232 #endif // have avr-as -mgcc-isr
 233
 234   fprintf (f, "*asm_errata_skip:\n%s\n\n", errata_skip
 235            ? "\t%{mno-skip-bug}"
 236            : "\t%{!mskip-bug: -mno-skip-bug}");
 237
 238   // avr-specific specs for linking / the linker.
 239
 240   int wrap_k =
 241     mcu->flash_size == 0x2000 ? 8
 242     : mcu->flash_size == 0x4000 ? 16
 243     : mcu->flash_size == 0x8000 ? 32
 244     : mcu->flash_size == 0x10000 ? 64
 245     : 0;
 246
 247   fprintf (f, "*link_pmem_wrap:\n");
 248   if (wrap_k == 8)
 249     fprintf (f, "\t%%{!mno-pmem-wrap-around: --pmem-wrap-around=8k}");
 250   else if (wrap_k > 8)
 251     fprintf (f, "\t%%{mpmem-wrap-around: --pmem-wrap-around=%dk}", wrap_k);
 252   fprintf (f, "\n\n");
 253
 254   fprintf (f, "*link_relax:\n\t%s\n\n", LINK_RELAX_SPEC);
 255
 256   fprintf (f, "*link_arch:\n\t%s\n\n", LINK_ARCH_SPEC);
 257
 258   if (is_device)
 259     {
 260       fprintf (f, "*link_data_start:\n");
 261       if (mcu->data_section_start
 262           != arch->default_data_section_start)
 263         fprintf (f, "\t%%{!Tdata:-Tdata 0x%lX}",
 264                  0x800000UL + mcu->data_section_start);
 265       fprintf (f, "\n\n");
 266
 267       fprintf (f, "*link_text_start:\n");
 268       if (mcu->text_section_start != 0x0)
 269         fprintf (f, "\t%%{!Ttext:-Ttext 0x%lX}", 0UL + mcu->text_section_start);
 270       fprintf (f, "\n\n");
 271     }
 272
 273   // Specs known to GCC.
 274
 275   if (is_device)
 276     {
 277       fprintf (f, "*self_spec:\n");
 278       fprintf (f, "\t%%{!mmcu=avr*: %%<mmcu=* -mmcu=%s} ", arch->name);
 279       fprintf (f, "%s ", rcall_spec);
 280       fprintf (f, "%s\n\n", sp8_spec);
 281
 282 #if defined (WITH_AVRLIBC)
 283       fprintf (f, "%s\n", help_dev_lib_name);
 284 #endif // WITH_AVRLIBC
 285
 286       fprintf (f, "*cpp:\n");
 287       fprintf (f, "\t-D%s -D__AVR_DEVICE_NAME__=%s", mcu->macro, mcu->name);
 288       fprintf (f, "\n\n");
 289     }
 290
 291   fprintf (f, "# End of file\n");
 292
 293   fclose (f);
 294 }
 295
 296
 297 int main (void)
 298 {
 299   for (const avr_mcu_t *mcu = avr_mcu_types; mcu->name; mcu++)
 300     print_mcu (mcu);
 301
 302   return EXIT_SUCCESS;
 303 }