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109 lines
4.2 KiB
C
109 lines
4.2 KiB
C
/* Definitions for option handling for Renesas M32R cpu.
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Copyright (C) 1996-2013 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 3, or (at your
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option) any later version.
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GCC is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef M32R_OPTS_H
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#define M32R_OPTS_H
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/* Code Models
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Code models are used to select between two choices of two separate
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possibilities (address space size, call insn to use):
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small: addresses use 24 bits, use bl to make calls
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medium: addresses use 32 bits, use bl to make calls (*1)
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large: addresses use 32 bits, use seth/add3/jl to make calls (*2)
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The fourth is "addresses use 24 bits, use seth/add3/jl to make calls" but
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using this one doesn't make much sense.
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(*1) The linker may eventually be able to relax seth/add3 -> ld24.
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(*2) The linker may eventually be able to relax seth/add3/jl -> bl.
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Internally these are recorded as TARGET_ADDR{24,32} and
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TARGET_CALL{26,32}.
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The __model__ attribute can be used to select the code model to use when
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accessing particular objects. */
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enum m32r_model { M32R_MODEL_SMALL, M32R_MODEL_MEDIUM, M32R_MODEL_LARGE };
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#define TARGET_MODEL_SMALL (m32r_model_selected == M32R_MODEL_SMALL)
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#define TARGET_MODEL_MEDIUM (m32r_model_selected == M32R_MODEL_MEDIUM)
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#define TARGET_MODEL_LARGE (m32r_model_selected == M32R_MODEL_LARGE)
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#define TARGET_ADDR24 (m32r_model_selected == M32R_MODEL_SMALL)
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#define TARGET_ADDR32 (! TARGET_ADDR24)
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#define TARGET_CALL26 (! TARGET_CALL32)
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#define TARGET_CALL32 (m32r_model_selected == M32R_MODEL_LARGE)
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/* The default is the small model. */
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#ifndef M32R_MODEL_DEFAULT
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#define M32R_MODEL_DEFAULT M32R_MODEL_SMALL
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#endif
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/* Small Data Area
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The SDA consists of sections .sdata, .sbss, and .scommon.
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.scommon isn't a real section, symbols in it have their section index
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set to SHN_M32R_SCOMMON, though support for it exists in the linker script.
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Two switches control the SDA:
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-G NNN - specifies the maximum size of variable to go in the SDA
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-msdata=foo - specifies how such variables are handled
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-msdata=none - small data area is disabled
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-msdata=sdata - small data goes in the SDA, special code isn't
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generated to use it, and special relocs aren't
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generated
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-msdata=use - small data goes in the SDA, special code is generated
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to use the SDA and special relocs are generated
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The SDA is not multilib'd, it isn't necessary.
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MULTILIB_EXTRA_OPTS is set in tmake_file to -msdata=sdata so multilib'd
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libraries have small data in .sdata/SHN_M32R_SCOMMON so programs that use
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-msdata=use will successfully link with them (references in header files
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will cause the compiler to emit code that refers to library objects in
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.data). ??? There can be a problem if the user passes a -G value greater
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than the default and a library object in a header file is that size.
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The default is 8 so this should be rare - if it occurs the user
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is required to rebuild the libraries or use a smaller value for -G. */
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/* Maximum size of variables that go in .sdata/.sbss.
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The -msdata=foo switch also controls how small variables are handled. */
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#ifndef SDATA_DEFAULT_SIZE
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#define SDATA_DEFAULT_SIZE 8
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#endif
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enum m32r_sdata { M32R_SDATA_NONE, M32R_SDATA_SDATA, M32R_SDATA_USE };
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#define TARGET_SDATA_NONE (m32r_sdata_selected == M32R_SDATA_NONE)
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#define TARGET_SDATA_SDATA (m32r_sdata_selected == M32R_SDATA_SDATA)
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#define TARGET_SDATA_USE (m32r_sdata_selected == M32R_SDATA_USE)
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/* Default is to disable the SDA
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[for upward compatibility with previous toolchains]. */
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#ifndef M32R_SDATA_DEFAULT
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#define M32R_SDATA_DEFAULT M32R_SDATA_NONE
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#endif
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#endif
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