blob: b9e935bab663bce293cb4b4e2fb0998b5bb04655 [file] [log] [blame]
/* Copyright (C) 1998-2021 Free Software Foundation, Inc.
Contributed by Joern Rennecke
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<>. */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define IN_TARGET_CODE 1
#include "config.h"
#include "avr-devices.c"
// Get rid of "defaults.h". We just need tm.h for `WITH_AVRLIBC' and
// and `WITH_RTEMS'. */
#include "tm.h"
// Mimic the include order as specified in config.gcc::tm_file.
#include "specs.h"
#if defined (WITH_AVRLIBC)
#include "avrlibc.h"
static const char header[] =
"# Generated by : ./gcc/config/avr/gen-avr-mmcu-specs.c\n"
"# Generated from : ./gcc/config/gcc.c\n"
"# ./gcc/config/avr/specs.h\n"
#if defined (WITH_AVRLIBC)
"# ./gcc/config/avr/avrlibc.h\n"
"# Used by : avr-gcc compiler driver\n"
"# Used for : building command options for sub-processes\n"
"# See <" SPECFILE_DOC_URL ">\n"
"# for a documentation of spec files.\n"
static const char help_copy_paste[] =
"# If you intend to use an existing device specs file as a starting point\n"
"# for a new device spec file, make sure you are copying from a specs\n"
"# file for a device from the same core architecture and SP width.\n"
"# See <" SPECFILE_USAGE_URL "> for a description\n"
"# of how to use such own spec files.\n";
#if defined (WITH_AVRLIBC)
static const char help_dev_lib_name[] =
"# AVR-LibC's avr/io.h uses the device specifying macro to determine\n"
"# the name of the device header. For example, -mmcu=atmega8a triggers\n"
"# the definition of __AVR_ATmega8A__ and avr/io.h includes the device\n"
"# header 'iom8a.h' by means of:\n"
"# ...\n"
"# #elif defined (__AVR_ATmega8A__)\n"
"# # include <avr/iom8a.h>\n"
"# #elif ...\n"
"# \n"
"# If no device macro is defined, AVR-LibC uses __AVR_DEV_LIB_NAME__\n"
"# as fallback to determine the name of the device header as\n"
"# \"avr/io\" + __AVR_DEV_LIB_NAME__ + \".h\"\n"
"# If you provide your own specs file for a device not yet known to\n"
"# AVR-LibC, you can now define the hook macro __AVR_DEV_LIB_NAME__\n"
"# as needed so that\n"
"# #include <avr/io.h>\n"
"# will include the desired device header. For ATmega8A the supplement\n"
"# to *cpp_avrlibc would read\n"
"# -D__AVR_DEV_LIB_NAME__=m8a\n"
#endif // WITH_AVRLIBC
static void
print_mcu (const avr_mcu_t *mcu)
const char *sp8_spec;
const char *rcall_spec;
const avr_mcu_t *arch_mcu;
const avr_arch_t *arch;
enum avr_arch_id arch_id = mcu->arch_id;
for (arch_mcu = mcu; arch_mcu->macro; )
if (arch_mcu->arch_id != arch_id)
arch = &avr_arch_types[arch_id];
char name[100];
if (snprintf (name, sizeof name, "specs-%s", mcu->name) >= (int) sizeof name)
FILE *f = fopen (name ,"w");
bool absdata = (mcu->dev_attribute & AVR_ISA_LDS) != 0;
bool errata_skip = (mcu->dev_attribute & AVR_ERRATA_SKIP) != 0;
bool rmw = (mcu->dev_attribute & AVR_ISA_RMW) != 0;
bool sp8 = (mcu->dev_attribute & AVR_SHORT_SP) != 0;
bool rcall = (mcu->dev_attribute & AVR_ISA_RCALL);
bool is_arch = mcu->macro == NULL;
bool is_device = ! is_arch;
int flash_pm_offset = 0;
if (arch->flash_pm_offset
&& mcu->flash_pm_offset
&& mcu->flash_pm_offset != arch->flash_pm_offset)
flash_pm_offset = mcu->flash_pm_offset;
if (is_arch
&& (ARCH_AVR2 == arch_id
|| ARCH_AVR25 == arch_id))
// Leave "avr2" and "avr25" alone. These two architectures are
// the only ones that mix devices with 8-bit SP and 16-bit SP.
sp8_spec = "";
sp8_spec = sp8 ? "-msp8" :"%<msp8";
if (is_arch
&& ARCH_AVRXMEGA3 == arch_id)
// Leave "avrxmega3" alone. This architectures is the only one
// that mixes devices with and without JMP / CALL.
rcall_spec = "";
rcall_spec = rcall ? "-mshort-calls" : "%<mshort-calls";
fprintf (f, "#\n"
"# Auto-generated specs for AVR ");
if (is_arch)
fprintf (f, "core architecture %s\n", arch->name);
fprintf (f, "device %s (core %s, %d-bit SP%s)\n", mcu->name,
arch->name, sp8 ? 8 : 16, rcall ? ", short-calls" : "");
fprintf (f, "%s\n", header);
if (is_device)
fprintf (f, "%s\n", help_copy_paste);
#if defined (WITH_AVRLIBC)
// AVR-LibC specific. See avrlibc.h for the specs using them as subspecs.
if (is_device)
fprintf (f, "*avrlibc_startfile:\n");
fprintf (f, "\tcrt%s.o%%s", mcu->name);
fprintf (f, "\n\n");
fprintf (f, "*avrlibc_devicelib:\n");
fprintf (f, "\t%%{!nodevicelib:-l%s}", mcu->name);
fprintf (f, "\n\n");
#endif // WITH_AVRLIBC
// avr-gcc specific specs for the compilation / the compiler proper.
int n_flash = 1 + (mcu->flash_size - 1) / 0x10000;
fprintf (f, "*cc1_n_flash:\n"
"\t%%{!mn-flash=*:-mn-flash=%d}\n\n", n_flash);
fprintf (f, "*cc1_rmw:\n%s\n\n", rmw
? "\t%{!mno-rmw: -mrmw}"
: "\t%{mrmw}");
fprintf (f, "*cc1_errata_skip:\n%s\n\n", errata_skip
? "\t%{!mno-skip-bug: -mskip-bug}"
: "\t%{!mskip-bug: -mno-skip-bug}");
fprintf (f, "*cc1_absdata:\n%s\n\n", absdata
? "\t%{!mno-absdata: -mabsdata}"
: "\t%{mabsdata}");
// avr-gcc specific specs for assembling / the assembler.
fprintf (f, "*asm_arch:\n\t-mmcu=%s\n\n", arch->name);
fprintf (f, "*asm_relax:\n\t%s\n\n", ASM_RELAX_SPEC);
#endif // have avr-as --mlink-relax
fprintf (f, "*asm_rmw:\n%s\n\n", rmw
? "\t%{!mno-rmw: -mrmw}"
: "\t%{mrmw}");
#endif // have avr-as -mrmw
fprintf (f, "*asm_gccisr:\n%s\n\n",
"\t%{!mno-gas-isr-prologues: -mgcc-isr}");
#endif // have avr-as -mgcc-isr
fprintf (f, "*asm_errata_skip:\n%s\n\n", errata_skip
? "\t%{mno-skip-bug}"
: "\t%{!mskip-bug: -mno-skip-bug}");
// avr-specific specs for linking / the linker.
int wrap_k =
mcu->flash_size == 0x2000 ? 8
: mcu->flash_size == 0x4000 ? 16
: mcu->flash_size == 0x8000 ? 32
: mcu->flash_size == 0x10000 ? 64
: 0;
fprintf (f, "*link_pmem_wrap:\n");
if (wrap_k == 8)
fprintf (f, "\t%%{!mno-pmem-wrap-around: --pmem-wrap-around=8k}");
else if (wrap_k > 8)
fprintf (f, "\t%%{mpmem-wrap-around: --pmem-wrap-around=%dk}", wrap_k);
fprintf (f, "\n\n");
fprintf (f, "*link_relax:\n\t%s\n\n", LINK_RELAX_SPEC);
fprintf (f, "*link_arch:\n\t%s", LINK_ARCH_SPEC);
if (is_device
&& flash_pm_offset)
fprintf (f, " --defsym=__RODATA_PM_OFFSET__=0x%x", flash_pm_offset);
fprintf (f, "\n\n");
if (is_device)
fprintf (f, "*link_data_start:\n");
if (mcu->data_section_start
!= arch->default_data_section_start)
fprintf (f, "\t%%{!Tdata:-Tdata 0x%lX}",
0x800000UL + mcu->data_section_start);
fprintf (f, "\n\n");
fprintf (f, "*link_text_start:\n");
if (mcu->text_section_start != 0x0)
fprintf (f, "\t%%{!Ttext:-Ttext 0x%lX}", 0UL + mcu->text_section_start);
fprintf (f, "\n\n");
// Specs known to GCC.
if (is_device)
fprintf (f, "*self_spec:\n");
fprintf (f, "\t%%{!mmcu=avr*: %%<mmcu=* -mmcu=%s} ", arch->name);
fprintf (f, "%s ", rcall_spec);
fprintf (f, "%s\n\n", sp8_spec);
#if defined (WITH_AVRLIBC)
fprintf (f, "%s\n", help_dev_lib_name);
fprintf (f, "*cpp_avrlibc:\n");
fprintf (f, "\t-D__AVR_DEVICE_NAME__=%s", mcu->name);
fprintf (f, "\n\n");
#endif // WITH_AVRLIBC
fprintf (f, "*cpp_mcu:\n");
fprintf (f, "\t-D%s", mcu->macro);
if (flash_pm_offset)
fprintf (f, " -U__AVR_PM_BASE_ADDRESS__");
fprintf (f, " -D__AVR_PM_BASE_ADDRESS__=0x%x", flash_pm_offset);
fprintf (f, "\n\n");
fprintf (f, "*cpp:\n");
fprintf (f, "\t%%(cpp_mcu)");
#if defined (WITH_AVRLIBC)
fprintf (f, " %%(cpp_avrlibc)");
#endif // WITH_AVRLIBC
fprintf (f, "\n\n");
fprintf (f, "# End of file\n");
fclose (f);
int main (void)
for (const avr_mcu_t *mcu = avr_mcu_types; mcu->name; mcu++)
print_mcu (mcu);