| /* Common target-dependent functionality for RISC-V |
| |
| Copyright (C) 2018 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef ARCH_RISCV_H |
| #define ARCH_RISCV_H |
| |
| #include "common/tdesc.h" |
| |
| /* The set of RISC-V architectural features that we track that impact how |
| we configure the actual gdbarch instance. We hold one of these in the |
| gdbarch_tdep structure, and use it to distinguish between different |
| RISC-V gdbarch instances. |
| |
| The information in here ideally comes from the target description, |
| however, if the target doesn't provide a target description then we will |
| create a default target description by first populating one of these |
| based on what we know about the binary being executed, and using that to |
| drive default target description creation. */ |
| |
| struct riscv_gdbarch_features |
| { |
| /* The size of the x-registers in bytes. This is either 4 (RV32), 8 |
| (RV64), or 16 (RV128). No other value is valid. Initialise to the |
| invalid 0 value so we can spot if one of these is used |
| uninitialised. */ |
| int xlen = 0; |
| |
| /* The size of the f-registers in bytes. This is either 4 (RV32), 8 |
| (RV64), or 16 (RV128). This can also hold the value 0 to indicate |
| that there are no f-registers. No other value is valid. */ |
| int flen = 0; |
| |
| /* This indicates if hardware floating point abi is in use. If the FLEN |
| field is 0 then this value _must_ be false. If the FLEN field is |
| non-zero and this field is false then this indicates the target has |
| floating point registers, but is still using the soft-float abi. If |
| this field is true then the hardware floating point abi is in use, and |
| values are passed in f-registers matching the size of FLEN. */ |
| bool hw_float_abi = false; |
| |
| /* Equality operator. */ |
| bool operator== (const struct riscv_gdbarch_features &rhs) const |
| { |
| return (xlen == rhs.xlen && flen == rhs.flen |
| && hw_float_abi == rhs.hw_float_abi); |
| } |
| |
| /* Inequality operator. */ |
| bool operator!= (const struct riscv_gdbarch_features &rhs) const |
| { |
| return !((*this) == rhs); |
| } |
| |
| /* Used by std::unordered_map to hash feature sets. */ |
| std::size_t hash () const noexcept |
| { |
| std::size_t val = ((xlen & 0x1f) << 6 |
| | (flen & 0x1f) << 1 |
| | (hw_float_abi ? 1 : 0)); |
| return val; |
| } |
| }; |
| |
| /* Create and return a target description that is compatible with |
| FEATURES. */ |
| |
| const target_desc *riscv_create_target_description |
| (struct riscv_gdbarch_features features); |
| |
| #endif /* ARCH_RISCV_H */ |