101 lines
3.3 KiB
C
101 lines
3.3 KiB
C
/* Copyright (C) 2018-2019 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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#include "common/common-defs.h"
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#include "riscv.h"
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#include <stdlib.h>
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#include <unordered_map>
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#include "../features/riscv/32bit-cpu.c"
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#include "../features/riscv/64bit-cpu.c"
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#include "../features/riscv/32bit-fpu.c"
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#include "../features/riscv/64bit-fpu.c"
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/* Wrapper used by std::unordered_map to generate hash for feature set. */
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struct riscv_gdbarch_features_hasher
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{
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std::size_t
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operator() (const riscv_gdbarch_features &features) const noexcept
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{
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return features.hash ();
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}
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};
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/* Cache of previously seen target descriptions, indexed by the feature set
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that created them. */
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static std::unordered_map<riscv_gdbarch_features,
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target_desc *,
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riscv_gdbarch_features_hasher> riscv_tdesc_cache;
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/* See arch/riscv.h. */
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const target_desc *
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riscv_create_target_description (struct riscv_gdbarch_features features)
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{
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/* Have we seen this feature set before? If we have return the same
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target description. GDB expects that if two target descriptions are
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the same (in content terms) then they will actually be the same
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instance. 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 auto it = riscv_tdesc_cache.find (features);
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if (it != riscv_tdesc_cache.end ())
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return it->second;
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/* Now we should create a new target description. */
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target_desc *tdesc = allocate_target_description ();
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#ifndef IN_PROCESS_AGENT
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std::string arch_name = "riscv";
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if (features.xlen == 4)
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arch_name.append (":rv32i");
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else if (features.xlen == 8)
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arch_name.append (":rv64i");
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else if (features.xlen == 16)
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arch_name.append (":rv128i");
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if (features.flen == 4)
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arch_name.append ("f");
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else if (features.flen == 8)
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arch_name.append ("d");
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else if (features.flen == 16)
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arch_name.append ("q");
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set_tdesc_architecture (tdesc, arch_name.c_str ());
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#endif
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long regnum = 0;
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/* For now we only support creating 32-bit or 64-bit x-registers. */
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if (features.xlen == 4)
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regnum = create_feature_riscv_32bit_cpu (tdesc, regnum);
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else if (features.xlen == 8)
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regnum = create_feature_riscv_64bit_cpu (tdesc, regnum);
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/* For now we only support creating 32-bit or 64-bit f-registers. */
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if (features.flen == 4)
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regnum = create_feature_riscv_32bit_fpu (tdesc, regnum);
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else if (features.flen == 8)
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regnum = create_feature_riscv_64bit_fpu (tdesc, regnum);
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/* Add to the cache. */
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riscv_tdesc_cache.emplace (features, tdesc);
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return tdesc;
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}
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