1/* Copyright (C) 1998-2022 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.cc"
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
54static const char header[] =
55  "#\n"
56  "# Generated by   : ./gcc/config/avr/gen-avr-mmcu-specs.cc\n"
57  "# Generated from : ./gcc/config/gcc.cc\n"
58  "#                  ./gcc/config/avr/specs.h\n"
59#if defined (WITH_AVRLIBC)
60  "#                  ./gcc/config/avr/avrlibc.h\n"
61#endif
62  "# Used by        : avr-gcc compiler driver\n"
63  "# Used for       : building command options for sub-processes\n"
64  "#\n"
65  "# See <" SPECFILE_DOC_URL ">\n"
66  "# for a documentation of spec files.\n"
67  "\n";
68
69static const char help_copy_paste[] =
70  "# If you intend to use an existing device specs file as a starting point\n"
71  "# for a new device spec file, make sure you are copying from a specs\n"
72  "# file for a device from the same core architecture and SP width.\n"
73  "# See <" SPECFILE_USAGE_URL "> for a description\n"
74  "# of how to use such own spec files.\n";
75
76#if defined (WITH_AVRLIBC)
77static const char help_dev_lib_name[] =
78  "# AVR-LibC's avr/io.h uses the device specifying macro to determine\n"
79  "# the name of the device header.  For example, -mmcu=atmega8a triggers\n"
80  "# the definition of __AVR_ATmega8A__ and avr/io.h includes the device\n"
81  "# header 'iom8a.h' by means of:\n"
82  "#\n"
83  "#     ...\n"
84  "#     #elif defined (__AVR_ATmega8A__)\n"
85  "#     #  include <avr/iom8a.h>\n"
86  "#     #elif ...\n"
87  "# \n"
88  "# If no device macro is defined, AVR-LibC uses __AVR_DEV_LIB_NAME__\n"
89  "# as fallback to determine the name of the device header as\n"
90  "#\n"
91  "#     \"avr/io\" + __AVR_DEV_LIB_NAME__ + \".h\"\n"
92  "#\n"
93  "# If you provide your own specs file for a device not yet known to\n"
94  "# AVR-LibC, you can now define the hook macro __AVR_DEV_LIB_NAME__\n"
95  "# as needed so that\n"
96  "#\n"
97  "#     #include <avr/io.h>\n"
98  "#\n"
99  "# will include the desired device header.  For ATmega8A the supplement\n"
100  "# to *cpp_avrlibc would read\n"
101  "#\n"
102  "#     -D__AVR_DEV_LIB_NAME__=m8a\n"
103  "\n";
104#endif // WITH_AVRLIBC
105
106static void
107print_mcu (const avr_mcu_t *mcu)
108{
109  const char *sp8_spec;
110  const char *rcall_spec;
111  const avr_mcu_t *arch_mcu;
112  const avr_arch_t *arch;
113  enum avr_arch_id arch_id = mcu->arch_id;
114
115  for (arch_mcu = mcu; arch_mcu->macro; )
116    arch_mcu--;
117  if (arch_mcu->arch_id != arch_id)
118    exit (EXIT_FAILURE);
119
120  arch = &avr_arch_types[arch_id];
121
122  char name[100];
123  if (snprintf (name, sizeof name, "specs-%s", mcu->name) >= (int) sizeof name)
124   exit (EXIT_FAILURE);
125
126  FILE *f = fopen (name ,"w");
127
128  bool absdata = (mcu->dev_attribute & AVR_ISA_LDS) != 0;
129  bool errata_skip = (mcu->dev_attribute & AVR_ERRATA_SKIP) != 0;
130  bool rmw = (mcu->dev_attribute & AVR_ISA_RMW) != 0;
131  bool sp8 = (mcu->dev_attribute & AVR_SHORT_SP) != 0;
132  bool rcall = (mcu->dev_attribute & AVR_ISA_RCALL);
133  bool is_arch = mcu->macro == NULL;
134  bool is_device = ! is_arch;
135  int flash_pm_offset = 0;
136
137  if (arch->flash_pm_offset
138      && mcu->flash_pm_offset
139      && mcu->flash_pm_offset != arch->flash_pm_offset)
140    {
141      flash_pm_offset = mcu->flash_pm_offset;
142    }
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", LINK_ARCH_SPEC);
257  if (is_device
258      && flash_pm_offset)
259    fprintf (f, " --defsym=__RODATA_PM_OFFSET__=0x%x", flash_pm_offset);
260  fprintf (f, "\n\n");
261
262  if (is_device)
263    {
264      fprintf (f, "*link_data_start:\n");
265      if (mcu->data_section_start
266          != arch->default_data_section_start)
267        fprintf (f, "\t%%{!Tdata:-Tdata 0x%lX}",
268                 0x800000UL + mcu->data_section_start);
269      fprintf (f, "\n\n");
270
271      fprintf (f, "*link_text_start:\n");
272      if (mcu->text_section_start != 0x0)
273        fprintf (f, "\t%%{!Ttext:-Ttext 0x%lX}", 0UL + mcu->text_section_start);
274      fprintf (f, "\n\n");
275    }
276
277  // Specs known to GCC.
278
279  if (is_device)
280    {
281      fprintf (f, "*self_spec:\n");
282      fprintf (f, "\t%%{!mmcu=avr*: %%<mmcu=* -mmcu=%s} ", arch->name);
283      fprintf (f, "%s ", rcall_spec);
284      fprintf (f, "%s\n\n", sp8_spec);
285
286#if defined (WITH_AVRLIBC)
287      fprintf (f, "%s\n", help_dev_lib_name);
288
289      fprintf (f, "*cpp_avrlibc:\n");
290      fprintf (f, "\t-D__AVR_DEVICE_NAME__=%s", mcu->name);
291      fprintf (f, "\n\n");
292#endif // WITH_AVRLIBC
293
294      fprintf (f, "*cpp_mcu:\n");
295      fprintf (f, "\t-D%s", mcu->macro);
296      if (flash_pm_offset)
297	{
298	  fprintf (f, " -U__AVR_PM_BASE_ADDRESS__");
299	  fprintf (f, " -D__AVR_PM_BASE_ADDRESS__=0x%x", flash_pm_offset);
300	}
301      fprintf (f, "\n\n");
302
303      fprintf (f, "*cpp:\n");
304      fprintf (f, "\t%%(cpp_mcu)");
305#if defined (WITH_AVRLIBC)
306      fprintf (f, " %%(cpp_avrlibc)");
307#endif // WITH_AVRLIBC
308      fprintf (f, "\n\n");
309    }
310
311  fprintf (f, "# End of file\n");
312
313  fclose (f);
314}
315
316
317int main (void)
318{
319  for (const avr_mcu_t *mcu = avr_mcu_types; mcu->name; mcu++)
320    print_mcu (mcu);
321
322  return EXIT_SUCCESS;
323}
324