gcc/config/avr/avr-arch.h

/* Definitions of types that are used to store AVR architecture and
   device information.
   Copyright (C) 2012-2021 Free Software Foundation, Inc.
   Contributed by Georg-Johann Lay (avr@gjlay.de)

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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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
<http://www.gnu.org/licenses/>.  */

#ifndef AVR_ARCH_H
#define AVR_ARCH_H

#define AVR_MMCU_DEFAULT "avr2"

/* This enum supplies indices into the avr_arch_types[] table below. */

enum avr_arch_id
{
  ARCH_UNKNOWN,
  ARCH_AVR1,
  ARCH_AVR2,
  ARCH_AVR25,
  ARCH_AVR3,
  ARCH_AVR31,
  ARCH_AVR35,
  ARCH_AVR4,
  ARCH_AVR5,
  ARCH_AVR51,
  ARCH_AVR6,
  ARCH_AVRTINY,
  ARCH_AVRXMEGA2,
  ARCH_AVRXMEGA3,
  ARCH_AVRXMEGA4,
  ARCH_AVRXMEGA5,
  ARCH_AVRXMEGA6,
  ARCH_AVRXMEGA7
};


/* Architecture-specific properties.  */

typedef struct
{
  /* Assembler only.  */
  int asm_only;

  /* Core have 'MUL*' instructions.  */
  int have_mul;

  /* Core have 'CALL' and 'JMP' instructions.  */
  int have_jmp_call;

  /* Core have 'MOVW' and 'LPM Rx,Z' instructions.  */
  int have_movw_lpmx;

  /* Core have 'ELPM' instructions.  */
  int have_elpm;

  /* Core have 'ELPM Rx,Z' instructions.  */
  int have_elpmx;

  /* Core have 'EICALL' and 'EIJMP' instructions.  */
  int have_eijmp_eicall;

  /* This is an XMEGA core.  */
  int xmega_p;

  /* This core has the RAMPD special function register
     and thus also the RAMPX, RAMPY and RAMPZ registers.  */
  int have_rampd;

  /* This is a TINY core. */
  int tiny_p;

  /* Default start of data section address for architecture.  */
  int default_data_section_start;

  /* Offset where flash memory is seen in RAM address range or 0.  */
  int flash_pm_offset;

  /* Offset between SFR address and RAM address:
     SFR-address = RAM-address - sfr_offset  */
  int sfr_offset;

  /* Architecture id to built-in define __AVR_ARCH__ (NULL -> no macro) */
  const char *const macro;

  /* Architecture name.  */
  const char *const name;
} avr_arch_t;


/* Device-specific properties.  */

typedef struct
{
  /* Device name.  */
  const char *const name;

  /* Index in avr_arch_types[].  */
  enum avr_arch_id arch_id;

  /* device specific feature */
  int dev_attribute;

  /* Must lie outside user's namespace.  NULL == no macro.  */
  const char *const macro;

  /* Start of data section.  */
  int data_section_start;

  /* Start of text section. */
  int text_section_start;

  /* Flash size in bytes.  */
  int flash_size;

  /* Offset where flash is seen in the RAM address space.  */
  int flash_pm_offset;
} avr_mcu_t;

/* AVR device specific features.

AVR_ISA_RMW
  Only few avr devices have Read-Modify-Write (RMW) instructions
  (XCH, LAC, LAS and LAT)

AVR_SHORT_SP
  Stack Pointer has only 8 bit width.
  The device / multilib has an 8-bit stack pointer (no SPH).

AVR_ERRATA_SKIP
  Some AVR devices have a core erratum when skipping a 2-word instruction.
  Skip instructions are:  SBRC, SBRS, SBIC, SBIS, CPSE.
  Problems will occur with return address is IRQ executes during the
  skip sequence.

  A support ticket from Atmel returned the following information:

     Subject: (ATTicket:644469) On AVR skip-bug core Erratum
     From: avr@atmel.com                    Date: 2011-07-27
     (Please keep the subject when replying to this mail)

     This errata exists only in AT90S8515 and ATmega103 devices.

     For information please refer the following respective errata links
       http://www.atmel.com/dyn/resources/prod_documents/doc2494.pdf
       http://www.atmel.com/dyn/resources/prod_documents/doc1436.pdf

AVR_ISA_RCALL
  Always use RJMP / RCALL and assume JMP / CALL are not available.
  This affects multilib selection via specs generation and -mshort-calls.
  Even if a device like ATtiny417 from avrxmega3 supports JMP / CALL, we
  assume these instructions are not available and we set the built-in
  macro __AVR_HAVE_JMP_CALL__ accordingly.  This macro is used to
  determine a rough estimate of flash size in libgcc, and AVR-LibC uses
  this macro to determine vector sizes.  */

enum avr_device_specific_features
{
  AVR_ISA_NONE,
  AVR_ISA_RMW     = 0x1, /* device has RMW instructions. */
  AVR_SHORT_SP    = 0x2, /* Stack Pointer has 8 bits width. */
  AVR_ERRATA_SKIP = 0x4, /* device has a core erratum. */
  AVR_ISA_LDS     = 0x8, /* whether LDS / STS is valid for all data in static
                            storage.  Only useful for reduced Tiny.  */
  AVR_ISA_RCALL   = 0x10 /* Use RJMP / RCALL even though JMP / CALL
                            are available (-mshort-calls).  */
};

/* Map architecture to its texinfo string.  */

typedef struct
{
  /* Architecture ID.  */
  enum avr_arch_id arch_id;

  /* textinfo source to describe the architecture.  */
  const char *texinfo;
} avr_arch_info_t;

/* Preprocessor macros to define depending on MCU type.  */

extern const avr_arch_t avr_arch_types[];
extern const avr_arch_t *avr_arch;

extern const avr_mcu_t avr_mcu_types[];

extern void avr_inform_core_architectures (void);

#endif /* AVR_ARCH_H */