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1 /* Definitions for option handling for Renesas M32R cpu.
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2 Copyright (C) 1996-2017 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published
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8 by the Free Software Foundation; either version 3, or (at your
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9 option) any later version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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14 License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #ifndef M32R_OPTS_H
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21 #define M32R_OPTS_H
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22
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23 /* Code Models
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24
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25 Code models are used to select between two choices of two separate
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26 possibilities (address space size, call insn to use):
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27
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28 small: addresses use 24 bits, use bl to make calls
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29 medium: addresses use 32 bits, use bl to make calls (*1)
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30 large: addresses use 32 bits, use seth/add3/jl to make calls (*2)
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31
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32 The fourth is "addresses use 24 bits, use seth/add3/jl to make calls" but
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33 using this one doesn't make much sense.
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34
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35 (*1) The linker may eventually be able to relax seth/add3 -> ld24.
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36 (*2) The linker may eventually be able to relax seth/add3/jl -> bl.
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37
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38 Internally these are recorded as TARGET_ADDR{24,32} and
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39 TARGET_CALL{26,32}.
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40
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41 The __model__ attribute can be used to select the code model to use when
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42 accessing particular objects. */
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43
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44 enum m32r_model { M32R_MODEL_SMALL, M32R_MODEL_MEDIUM, M32R_MODEL_LARGE };
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45
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46 #define TARGET_MODEL_SMALL (m32r_model_selected == M32R_MODEL_SMALL)
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47 #define TARGET_MODEL_MEDIUM (m32r_model_selected == M32R_MODEL_MEDIUM)
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48 #define TARGET_MODEL_LARGE (m32r_model_selected == M32R_MODEL_LARGE)
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49 #define TARGET_ADDR24 (m32r_model_selected == M32R_MODEL_SMALL)
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50 #define TARGET_ADDR32 (! TARGET_ADDR24)
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51 #define TARGET_CALL26 (! TARGET_CALL32)
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52 #define TARGET_CALL32 (m32r_model_selected == M32R_MODEL_LARGE)
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53
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54 /* The default is the small model. */
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55 #ifndef M32R_MODEL_DEFAULT
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56 #define M32R_MODEL_DEFAULT M32R_MODEL_SMALL
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57 #endif
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58
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59 /* Small Data Area
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60
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61 The SDA consists of sections .sdata, .sbss, and .scommon.
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62 .scommon isn't a real section, symbols in it have their section index
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63 set to SHN_M32R_SCOMMON, though support for it exists in the linker script.
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64
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65 Two switches control the SDA:
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66
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67 -G NNN - specifies the maximum size of variable to go in the SDA
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68
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69 -msdata=foo - specifies how such variables are handled
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70
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71 -msdata=none - small data area is disabled
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72
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73 -msdata=sdata - small data goes in the SDA, special code isn't
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74 generated to use it, and special relocs aren't
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75 generated
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76
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77 -msdata=use - small data goes in the SDA, special code is generated
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78 to use the SDA and special relocs are generated
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79
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80 The SDA is not multilib'd, it isn't necessary.
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81 MULTILIB_EXTRA_OPTS is set in tmake_file to -msdata=sdata so multilib'd
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82 libraries have small data in .sdata/SHN_M32R_SCOMMON so programs that use
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83 -msdata=use will successfully link with them (references in header files
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84 will cause the compiler to emit code that refers to library objects in
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85 .data). ??? There can be a problem if the user passes a -G value greater
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86 than the default and a library object in a header file is that size.
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87 The default is 8 so this should be rare - if it occurs the user
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88 is required to rebuild the libraries or use a smaller value for -G. */
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89
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90 /* Maximum size of variables that go in .sdata/.sbss.
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91 The -msdata=foo switch also controls how small variables are handled. */
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92 #ifndef SDATA_DEFAULT_SIZE
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93 #define SDATA_DEFAULT_SIZE 8
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94 #endif
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95
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96 enum m32r_sdata { M32R_SDATA_NONE, M32R_SDATA_SDATA, M32R_SDATA_USE };
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97
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98 #define TARGET_SDATA_NONE (m32r_sdata_selected == M32R_SDATA_NONE)
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99 #define TARGET_SDATA_SDATA (m32r_sdata_selected == M32R_SDATA_SDATA)
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100 #define TARGET_SDATA_USE (m32r_sdata_selected == M32R_SDATA_USE)
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101
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102 /* Default is to disable the SDA
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103 [for upward compatibility with previous toolchains]. */
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104 #ifndef M32R_SDATA_DEFAULT
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105 #define M32R_SDATA_DEFAULT M32R_SDATA_NONE
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106 #endif
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107
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108 #endif
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