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- /* Common target-dependent functionality for RISC-V
- Copyright (C) 2018-2022 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 "gdbsupport/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;
- /* The size of the v-registers in bytes. The value 0 indicates a target
- with no vector registers. The minimum value for a standard compliant
- target should be 16, but GDB doesn't currently mind, and will accept
- any vector size. */
- int vlen = 0;
- /* When true this target is RV32E. */
- bool embedded = false;
- /* Equality operator. */
- bool operator== (const struct riscv_gdbarch_features &rhs) const
- {
- return (xlen == rhs.xlen && flen == rhs.flen
- && embedded == rhs.embedded && vlen == rhs.vlen);
- }
- /* 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 = ((embedded ? 1 : 0) << 10
- | (xlen & 0x1f) << 5
- | (flen & 0x1f) << 0
- | (vlen & 0xfff) << 11);
- return val;
- }
- };
- #ifdef GDBSERVER
- /* Create and return a target description that is compatible with FEATURES.
- This is only used directly from the gdbserver where the created target
- description is modified after it is return. */
- target_desc_up riscv_create_target_description
- (const struct riscv_gdbarch_features features);
- #else
- /* Lookup an already existing target description matching FEATURES, or
- create a new target description if this is the first time we have seen
- FEATURES. For the same FEATURES the same target_desc is always
- returned. This is important when trying to lookup gdbarch objects as
- GDBARCH_LIST_LOOKUP_BY_INFO performs a pointer comparison on target
- descriptions to find candidate gdbarch objects. */
- const target_desc *riscv_lookup_target_description
- (const struct riscv_gdbarch_features features);
- #endif /* GDBSERVER */
- #endif /* ARCH_RISCV_H */
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