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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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