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1 | /* Common target-dependent functionality for RISC-V |
2 | ||
b811d2c2 | 3 | Copyright (C) 2018-2020 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 | ||
65a4b373 AB |
49 | /* Equality operator. */ |
50 | bool operator== (const struct riscv_gdbarch_features &rhs) const | |
51 | { | |
113b7b81 | 52 | return (xlen == rhs.xlen && flen == rhs.flen); |
65a4b373 AB |
53 | } |
54 | ||
55 | /* Inequality operator. */ | |
56 | bool operator!= (const struct riscv_gdbarch_features &rhs) const | |
57 | { | |
58 | return !((*this) == rhs); | |
59 | } | |
63449436 AB |
60 | |
61 | /* Used by std::unordered_map to hash feature sets. */ | |
62 | std::size_t hash () const noexcept | |
63 | { | |
113b7b81 | 64 | std::size_t val = ((xlen & 0x1f) << 5 | (flen & 0x1f) << 0); |
63449436 AB |
65 | return val; |
66 | } | |
b5ffee31 AB |
67 | }; |
68 | ||
d1c9b20f AB |
69 | #ifdef GDBSERVER |
70 | ||
71 | /* Create and return a target description that is compatible with FEATURES. | |
72 | This is only used directly from the gdbserver where the created target | |
73 | description is modified after it is return. */ | |
74 | ||
75 | target_desc *riscv_create_target_description | |
76 | (const struct riscv_gdbarch_features features); | |
77 | ||
78 | #else | |
79 | ||
80 | /* Lookup an already existing target description matching FEATURES, or | |
81 | create a new target description if this is the first time we have seen | |
82 | FEATURES. For the same FEATURES the same target_desc is always | |
83 | returned. This is important when trying to lookup gdbarch objects as | |
84 | GDBARCH_LIST_LOOKUP_BY_INFO performs a pointer comparison on target | |
85 | descriptions to find candidate gdbarch objects. */ | |
86 | ||
87 | const target_desc *riscv_lookup_target_description | |
88 | (const struct riscv_gdbarch_features features); | |
89 | ||
90 | #endif /* GDBSERVER */ | |
b5ffee31 | 91 | |
b5ffee31 AB |
92 | |
93 | #endif /* ARCH_RISCV_H */ |