107 lines
3.7 KiB
C
107 lines
3.7 KiB
C
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/* Common target-dependent functionality for RISC-V
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Copyright (C) 2018-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef ARCH_RISCV_H
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#define ARCH_RISCV_H
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#include "gdbsupport/tdesc.h"
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/* The set of RISC-V architectural features that we track that impact how
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we configure the actual gdbarch instance. We hold one of these in the
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gdbarch_tdep structure, and use it to distinguish between different
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RISC-V gdbarch instances.
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The information in here ideally comes from the target description,
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however, if the target doesn't provide a target description then we will
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create a default target description by first populating one of these
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based on what we know about the binary being executed, and using that to
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drive default target description creation. */
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struct riscv_gdbarch_features
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{
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/* The size of the x-registers in bytes. This is either 4 (RV32), 8
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(RV64), or 16 (RV128). No other value is valid. Initialise to the
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invalid 0 value so we can spot if one of these is used
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uninitialised. */
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int xlen = 0;
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/* The size of the f-registers in bytes. This is either 4 (RV32), 8
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(RV64), or 16 (RV128). This can also hold the value 0 to indicate
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that there are no f-registers. No other value is valid. */
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int flen = 0;
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/* The size of the v-registers in bytes. The value 0 indicates a target
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with no vector registers. The minimum value for a standard compliant
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target should be 16, but GDB doesn't currently mind, and will accept
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any vector size. */
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int vlen = 0;
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/* When true this target is RV32E. */
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bool embedded = false;
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/* Equality operator. */
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bool operator== (const struct riscv_gdbarch_features &rhs) const
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{
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return (xlen == rhs.xlen && flen == rhs.flen
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&& embedded == rhs.embedded && vlen == rhs.vlen);
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}
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/* Inequality operator. */
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bool operator!= (const struct riscv_gdbarch_features &rhs) const
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{
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return !((*this) == rhs);
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}
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/* Used by std::unordered_map to hash feature sets. */
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std::size_t hash () const noexcept
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{
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std::size_t val = ((embedded ? 1 : 0) << 10
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| (xlen & 0x1f) << 5
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| (flen & 0x1f) << 0
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| (vlen & 0xfff) << 11);
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return val;
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}
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};
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#ifdef GDBSERVER
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/* Create and return a target description that is compatible with FEATURES.
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This is only used directly from the gdbserver where the created target
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description is modified after it is return. */
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target_desc_up riscv_create_target_description
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(const struct riscv_gdbarch_features features);
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#else
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/* Lookup an already existing target description matching FEATURES, or
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create a new target description if this is the first time we have seen
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FEATURES. For the same FEATURES the same target_desc is always
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returned. This is important when trying to lookup gdbarch objects as
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GDBARCH_LIST_LOOKUP_BY_INFO performs a pointer comparison on target
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descriptions to find candidate gdbarch objects. */
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const target_desc *riscv_lookup_target_description
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(const struct riscv_gdbarch_features features);
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#endif /* GDBSERVER */
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#endif /* ARCH_RISCV_H */
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