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/* Definitions for option handling for Renesas M32R cpu.
Copyright (C) 1996-2017 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
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