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8a784afb | 1 | /* Definitions for option handling for Renesas M32R cpu. |
7adcbafe | 2 | Copyright (C) 1996-2022 Free Software Foundation, Inc. |
8a784afb JM |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU General Public License as published | |
8 | by the Free Software Foundation; either version 3, or (at your | |
9 | option) any later version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT | |
12 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
13 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
14 | License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GCC; see the file COPYING3. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #ifndef M32R_OPTS_H | |
21 | #define M32R_OPTS_H | |
22 | ||
23 | /* Code Models | |
24 | ||
25 | Code models are used to select between two choices of two separate | |
26 | possibilities (address space size, call insn to use): | |
27 | ||
28 | small: addresses use 24 bits, use bl to make calls | |
29 | medium: addresses use 32 bits, use bl to make calls (*1) | |
30 | large: addresses use 32 bits, use seth/add3/jl to make calls (*2) | |
31 | ||
32 | The fourth is "addresses use 24 bits, use seth/add3/jl to make calls" but | |
33 | using this one doesn't make much sense. | |
34 | ||
35 | (*1) The linker may eventually be able to relax seth/add3 -> ld24. | |
36 | (*2) The linker may eventually be able to relax seth/add3/jl -> bl. | |
37 | ||
38 | Internally these are recorded as TARGET_ADDR{24,32} and | |
39 | TARGET_CALL{26,32}. | |
40 | ||
41 | The __model__ attribute can be used to select the code model to use when | |
42 | accessing particular objects. */ | |
43 | ||
44 | enum m32r_model { M32R_MODEL_SMALL, M32R_MODEL_MEDIUM, M32R_MODEL_LARGE }; | |
45 | ||
46 | #define TARGET_MODEL_SMALL (m32r_model_selected == M32R_MODEL_SMALL) | |
47 | #define TARGET_MODEL_MEDIUM (m32r_model_selected == M32R_MODEL_MEDIUM) | |
48 | #define TARGET_MODEL_LARGE (m32r_model_selected == M32R_MODEL_LARGE) | |
49 | #define TARGET_ADDR24 (m32r_model_selected == M32R_MODEL_SMALL) | |
50 | #define TARGET_ADDR32 (! TARGET_ADDR24) | |
51 | #define TARGET_CALL26 (! TARGET_CALL32) | |
52 | #define TARGET_CALL32 (m32r_model_selected == M32R_MODEL_LARGE) | |
53 | ||
54 | /* The default is the small model. */ | |
55 | #ifndef M32R_MODEL_DEFAULT | |
56 | #define M32R_MODEL_DEFAULT M32R_MODEL_SMALL | |
57 | #endif | |
58 | ||
59 | /* Small Data Area | |
60 | ||
61 | The SDA consists of sections .sdata, .sbss, and .scommon. | |
62 | .scommon isn't a real section, symbols in it have their section index | |
63 | set to SHN_M32R_SCOMMON, though support for it exists in the linker script. | |
64 | ||
65 | Two switches control the SDA: | |
66 | ||
67 | -G NNN - specifies the maximum size of variable to go in the SDA | |
68 | ||
69 | -msdata=foo - specifies how such variables are handled | |
70 | ||
71 | -msdata=none - small data area is disabled | |
72 | ||
73 | -msdata=sdata - small data goes in the SDA, special code isn't | |
74 | generated to use it, and special relocs aren't | |
75 | generated | |
76 | ||
77 | -msdata=use - small data goes in the SDA, special code is generated | |
78 | to use the SDA and special relocs are generated | |
79 | ||
80 | The SDA is not multilib'd, it isn't necessary. | |
81 | MULTILIB_EXTRA_OPTS is set in tmake_file to -msdata=sdata so multilib'd | |
82 | libraries have small data in .sdata/SHN_M32R_SCOMMON so programs that use | |
83 | -msdata=use will successfully link with them (references in header files | |
84 | will cause the compiler to emit code that refers to library objects in | |
85 | .data). ??? There can be a problem if the user passes a -G value greater | |
86 | than the default and a library object in a header file is that size. | |
87 | The default is 8 so this should be rare - if it occurs the user | |
88 | is required to rebuild the libraries or use a smaller value for -G. */ | |
89 | ||
90 | /* Maximum size of variables that go in .sdata/.sbss. | |
91 | The -msdata=foo switch also controls how small variables are handled. */ | |
92 | #ifndef SDATA_DEFAULT_SIZE | |
93 | #define SDATA_DEFAULT_SIZE 8 | |
94 | #endif | |
95 | ||
96 | enum m32r_sdata { M32R_SDATA_NONE, M32R_SDATA_SDATA, M32R_SDATA_USE }; | |
97 | ||
98 | #define TARGET_SDATA_NONE (m32r_sdata_selected == M32R_SDATA_NONE) | |
99 | #define TARGET_SDATA_SDATA (m32r_sdata_selected == M32R_SDATA_SDATA) | |
100 | #define TARGET_SDATA_USE (m32r_sdata_selected == M32R_SDATA_USE) | |
101 | ||
102 | /* Default is to disable the SDA | |
103 | [for upward compatibility with previous toolchains]. */ | |
104 | #ifndef M32R_SDATA_DEFAULT | |
105 | #define M32R_SDATA_DEFAULT M32R_SDATA_NONE | |
106 | #endif | |
107 | ||
108 | #endif |