| /* Definitions for option handling for Renesas M32R cpu. |
| Copyright (C) 1996-2022 Free Software Foundation, Inc. |
| |
| 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 M32R_OPTS_H |
| #define M32R_OPTS_H |
| |
| /* Code Models |
| |
| Code models are used to select between two choices of two separate |
| possibilities (address space size, call insn to use): |
| |
| small: addresses use 24 bits, use bl to make calls |
| medium: addresses use 32 bits, use bl to make calls (*1) |
| large: addresses use 32 bits, use seth/add3/jl to make calls (*2) |
| |
| The fourth is "addresses use 24 bits, use seth/add3/jl to make calls" but |
| using this one doesn't make much sense. |
| |
| (*1) The linker may eventually be able to relax seth/add3 -> ld24. |
| (*2) The linker may eventually be able to relax seth/add3/jl -> bl. |
| |
| Internally these are recorded as TARGET_ADDR{24,32} and |
| TARGET_CALL{26,32}. |
| |
| The __model__ attribute can be used to select the code model to use when |
| accessing particular objects. */ |
| |
| enum m32r_model { M32R_MODEL_SMALL, M32R_MODEL_MEDIUM, M32R_MODEL_LARGE }; |
| |
| #define TARGET_MODEL_SMALL (m32r_model_selected == M32R_MODEL_SMALL) |
| #define TARGET_MODEL_MEDIUM (m32r_model_selected == M32R_MODEL_MEDIUM) |
| #define TARGET_MODEL_LARGE (m32r_model_selected == M32R_MODEL_LARGE) |
| #define TARGET_ADDR24 (m32r_model_selected == M32R_MODEL_SMALL) |
| #define TARGET_ADDR32 (! TARGET_ADDR24) |
| #define TARGET_CALL26 (! TARGET_CALL32) |
| #define TARGET_CALL32 (m32r_model_selected == M32R_MODEL_LARGE) |
| |
| /* The default is the small model. */ |
| #ifndef M32R_MODEL_DEFAULT |
| #define M32R_MODEL_DEFAULT M32R_MODEL_SMALL |
| #endif |
| |
| /* Small Data Area |
| |
| The SDA consists of sections .sdata, .sbss, and .scommon. |
| .scommon isn't a real section, symbols in it have their section index |
| set to SHN_M32R_SCOMMON, though support for it exists in the linker script. |
| |
| Two switches control the SDA: |
| |
| -G NNN - specifies the maximum size of variable to go in the SDA |
| |
| -msdata=foo - specifies how such variables are handled |
| |
| -msdata=none - small data area is disabled |
| |
| -msdata=sdata - small data goes in the SDA, special code isn't |
| generated to use it, and special relocs aren't |
| generated |
| |
| -msdata=use - small data goes in the SDA, special code is generated |
| to use the SDA and special relocs are generated |
| |
| The SDA is not multilib'd, it isn't necessary. |
| MULTILIB_EXTRA_OPTS is set in tmake_file to -msdata=sdata so multilib'd |
| libraries have small data in .sdata/SHN_M32R_SCOMMON so programs that use |
| -msdata=use will successfully link with them (references in header files |
| will cause the compiler to emit code that refers to library objects in |
| .data). ??? There can be a problem if the user passes a -G value greater |
| than the default and a library object in a header file is that size. |
| The default is 8 so this should be rare - if it occurs the user |
| is required to rebuild the libraries or use a smaller value for -G. */ |
| |
| /* Maximum size of variables that go in .sdata/.sbss. |
| The -msdata=foo switch also controls how small variables are handled. */ |
| #ifndef SDATA_DEFAULT_SIZE |
| #define SDATA_DEFAULT_SIZE 8 |
| #endif |
| |
| enum m32r_sdata { M32R_SDATA_NONE, M32R_SDATA_SDATA, M32R_SDATA_USE }; |
| |
| #define TARGET_SDATA_NONE (m32r_sdata_selected == M32R_SDATA_NONE) |
| #define TARGET_SDATA_SDATA (m32r_sdata_selected == M32R_SDATA_SDATA) |
| #define TARGET_SDATA_USE (m32r_sdata_selected == M32R_SDATA_USE) |
| |
| /* Default is to disable the SDA |
| [for upward compatibility with previous toolchains]. */ |
| #ifndef M32R_SDATA_DEFAULT |
| #define M32R_SDATA_DEFAULT M32R_SDATA_NONE |
| #endif |
| |
| #endif |