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b5ffee31 AB |
1 | /* Common target-dependent functionality for RISC-V |
2 | ||
3666a048 | 3 | Copyright (C) 2018-2021 Free Software Foundation, Inc. |
b5ffee31 AB |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #ifndef ARCH_RISCV_H | |
21 | #define ARCH_RISCV_H | |
22 | ||
268a13a5 | 23 | #include "gdbsupport/tdesc.h" |
b5ffee31 AB |
24 | |
25 | /* The set of RISC-V architectural features that we track that impact how | |
26 | we configure the actual gdbarch instance. We hold one of these in the | |
27 | gdbarch_tdep structure, and use it to distinguish between different | |
28 | RISC-V gdbarch instances. | |
29 | ||
30 | The information in here ideally comes from the target description, | |
31 | however, if the target doesn't provide a target description then we will | |
32 | create a default target description by first populating one of these | |
33 | based on what we know about the binary being executed, and using that to | |
34 | drive default target description creation. */ | |
35 | ||
36 | struct riscv_gdbarch_features | |
37 | { | |
38 | /* The size of the x-registers in bytes. This is either 4 (RV32), 8 | |
39 | (RV64), or 16 (RV128). No other value is valid. Initialise to the | |
40 | invalid 0 value so we can spot if one of these is used | |
41 | uninitialised. */ | |
42 | int xlen = 0; | |
43 | ||
44 | /* The size of the f-registers in bytes. This is either 4 (RV32), 8 | |
45 | (RV64), or 16 (RV128). This can also hold the value 0 to indicate | |
46 | that there are no f-registers. No other value is valid. */ | |
47 | int flen = 0; | |
48 | ||
25428040 AB |
49 | /* When true this target is RV32E. */ |
50 | bool embedded = false; | |
51 | ||
65a4b373 AB |
52 | /* Equality operator. */ |
53 | bool operator== (const struct riscv_gdbarch_features &rhs) const | |
54 | { | |
25428040 | 55 | return (xlen == rhs.xlen && flen == rhs.flen && embedded == rhs.embedded); |
65a4b373 AB |
56 | } |
57 | ||
58 | /* Inequality operator. */ | |
59 | bool operator!= (const struct riscv_gdbarch_features &rhs) const | |
60 | { | |
61 | return !((*this) == rhs); | |
62 | } | |
63449436 AB |
63 | |
64 | /* Used by std::unordered_map to hash feature sets. */ | |
65 | std::size_t hash () const noexcept | |
66 | { | |
25428040 AB |
67 | std::size_t val = ((embedded ? 1 : 0) << 10 |
68 | | (xlen & 0x1f) << 5 | |
69 | | (flen & 0x1f) << 0); | |
63449436 AB |
70 | return val; |
71 | } | |
b5ffee31 AB |
72 | }; |
73 | ||
d1c9b20f AB |
74 | #ifdef GDBSERVER |
75 | ||
76 | /* Create and return a target description that is compatible with FEATURES. | |
77 | This is only used directly from the gdbserver where the created target | |
78 | description is modified after it is return. */ | |
79 | ||
bbb826f5 | 80 | target_desc_up riscv_create_target_description |
d1c9b20f AB |
81 | (const struct riscv_gdbarch_features features); |
82 | ||
83 | #else | |
84 | ||
85 | /* Lookup an already existing target description matching FEATURES, or | |
86 | create a new target description if this is the first time we have seen | |
87 | FEATURES. For the same FEATURES the same target_desc is always | |
88 | returned. This is important when trying to lookup gdbarch objects as | |
89 | GDBARCH_LIST_LOOKUP_BY_INFO performs a pointer comparison on target | |
90 | descriptions to find candidate gdbarch objects. */ | |
91 | ||
92 | const target_desc *riscv_lookup_target_description | |
93 | (const struct riscv_gdbarch_features features); | |
94 | ||
95 | #endif /* GDBSERVER */ | |
b5ffee31 | 96 | |
b5ffee31 AB |
97 | |
98 | #endif /* ARCH_RISCV_H */ |