/* Common target-dependent functionality for RISC-V Copyright (C) 2018-2020 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; /* Equality operator. */ bool operator== (const struct riscv_gdbarch_features &rhs) const { return (xlen == rhs.xlen && flen == rhs.flen); } /* 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) << 5 | (flen & 0x1f) << 0); 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 *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 */ |