gcc/config/avr/avr-arch.h

   1 /* Definitions of types that are used to store AVR architecture and
   2    device information.
   3    Copyright (C) 2012-2017 Free Software Foundation, Inc.
   4    Contributed by Georg-Johann Lay (avr@gjlay.de)
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GCC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef AVR_ARCH_H
  23 #define AVR_ARCH_H
  24
  25 #define AVR_MMCU_DEFAULT "avr2"
  26
  27 /* This enum supplies indices into the avr_arch_types[] table below. */
  28
  29 enum avr_arch_id
  30 {
  31   ARCH_UNKNOWN,
  32   ARCH_AVR1,
  33   ARCH_AVR2,
  34   ARCH_AVR25,
  35   ARCH_AVR3,
  36   ARCH_AVR31,
  37   ARCH_AVR35,
  38   ARCH_AVR4,
  39   ARCH_AVR5,
  40   ARCH_AVR51,
  41   ARCH_AVR6,
  42   ARCH_AVRTINY,
  43   ARCH_AVRXMEGA2,
  44   ARCH_AVRXMEGA3,
  45   ARCH_AVRXMEGA4,
  46   ARCH_AVRXMEGA5,
  47   ARCH_AVRXMEGA6,
  48   ARCH_AVRXMEGA7
  49 };
  50
  51
  52 /* Architecture-specific properties.  */
  53
  54 typedef struct
  55 {
  56   /* Assembler only.  */
  57   int asm_only;
  58
  59   /* Core have 'MUL*' instructions.  */
  60   int have_mul;
  61
  62   /* Core have 'CALL' and 'JMP' instructions.  */
  63   int have_jmp_call;
  64
  65   /* Core have 'MOVW' and 'LPM Rx,Z' instructions.  */
  66   int have_movw_lpmx;
  67
  68   /* Core have 'ELPM' instructions.  */
  69   int have_elpm;
  70
  71   /* Core have 'ELPM Rx,Z' instructions.  */
  72   int have_elpmx;
  73
  74   /* Core have 'EICALL' and 'EIJMP' instructions.  */
  75   int have_eijmp_eicall;
  76
  77   /* This is an XMEGA core.  */
  78   int xmega_p;
  79
  80   /* This core has the RAMPD special function register
  81      and thus also the RAMPX, RAMPY and RAMPZ registers.  */
  82   int have_rampd;
  83
  84   /* This is a TINY core. */
  85   int tiny_p;
  86
  87   /* Default start of data section address for architecture.  */
  88   int default_data_section_start;
  89
  90   /* Offset where flash memory is seen in RAM address range or 0.  */
  91   int flash_pm_offset;
  92
  93   /* Offset between SFR address and RAM address:
  94      SFR-address = RAM-address - sfr_offset  */
  95   int sfr_offset;
  96
  97   /* Architecture id to built-in define __AVR_ARCH__ (NULL -> no macro) */
  98   const char *const macro;
  99
 100   /* Architecture name.  */
 101   const char *const name;
 102 } avr_arch_t;
 103
 104
 105 /* Device-specific properties.  */
 106
 107 typedef struct
 108 {
 109   /* Device name.  */
 110   const char *const name;
 111
 112   /* Index in avr_arch_types[].  */
 113   enum avr_arch_id arch_id;
 114
 115   /* device specific feature */
 116   int dev_attribute;
 117
 118   /* Must lie outside user's namespace.  NULL == no macro.  */
 119   const char *const macro;
 120
 121   /* Start of data section.  */
 122   int data_section_start;
 123
 124   /* Start of text section. */
 125   int text_section_start;
 126
 127   /* Flash size in bytes.  */
 128   int flash_size;
 129 } avr_mcu_t;
 130
 131 /* AVR device specific features.
 132
 133 AVR_ISA_RMW
 134   Only few avr devices have Read-Modify-Write (RMW) instructions
 135   (XCH, LAC, LAS and LAT)
 136
 137 AVR_SHORT_SP
 138   Stack Pointer has only 8 bit width.
 139   The device / multilib has an 8-bit stack pointer (no SPH).
 140
 141 AVR_ERRATA_SKIP
 142   Some AVR devices have a core erratum when skipping a 2-word instruction.
 143   Skip instructions are:  SBRC, SBRS, SBIC, SBIS, CPSE.
 144   Problems will occur with return address is IRQ executes during the
 145   skip sequence.
 146
 147   A support ticket from Atmel returned the following information:
 148
 149      Subject: (ATTicket:644469) On AVR skip-bug core Erratum
 150      From: avr@atmel.com                    Date: 2011-07-27
 151      (Please keep the subject when replying to this mail)
 152
 153      This errata exists only in AT90S8515 and ATmega103 devices.
 154
 155      For information please refer the following respective errata links
 156        http://www.atmel.com/dyn/resources/prod_documents/doc2494.pdf
 157        http://www.atmel.com/dyn/resources/prod_documents/doc1436.pdf
 158
 159 AVR_ISA_RCALL
 160   Always use RJMP / RCALL and assume JMP / CALL are not available.
 161   This affects multilib selection via specs generation and -mshort-calls.
 162   Even if a device like ATtiny417 from avrxmega3 supports JMP / CALL, we
 163   assume these instructions are not available and we set the built-in
 164   macro __AVR_HAVE_JMP_CALL__ accordingly.  This macro is used to
 165   determine a rough estimate of flash size in libgcc, and AVR-LibC uses
 166   this macro to determine vector sizes.  */
 167
 168 enum avr_device_specific_features
 169 {
 170   AVR_ISA_NONE,
 171   AVR_ISA_RMW     = 0x1, /* device has RMW instructions. */
 172   AVR_SHORT_SP    = 0x2, /* Stack Pointer has 8 bits width. */
 173   AVR_ERRATA_SKIP = 0x4, /* device has a core erratum. */
 174   AVR_ISA_LDS     = 0x8, /* whether LDS / STS is valid for all data in static
 175                             storage.  Only useful for reduced Tiny.  */
 176   AVR_ISA_RCALL   = 0x10 /* Use RJMP / RCALL even though JMP / CALL
 177                             are available (-mshort-calls).  */
 178 };
 179
 180 /* Map architecture to its texinfo string.  */
 181
 182 typedef struct
 183 {
 184   /* Architecture ID.  */
 185   enum avr_arch_id arch_id;
 186
 187   /* textinfo source to describe the architecture.  */
 188   const char *texinfo;
 189 } avr_arch_info_t;
 190
 191 /* Preprocessor macros to define depending on MCU type.  */
 192
 193 extern const avr_arch_t avr_arch_types[];
 194 extern const avr_arch_t *avr_arch;
 195
 196 extern const avr_mcu_t avr_mcu_types[];
 197
 198 extern void avr_inform_core_architectures (void);
 199
 200 #endif /* AVR_ARCH_H */