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e74d08100d
This commit adds initial target description support for LoongArch. Signed-off-by: Zhensong Liu <liuzhensong@loongson.cn> Signed-off-by: Qing zhang <zhangqing@loongson.cn> Signed-off-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
89 lines
3.0 KiB
C
89 lines
3.0 KiB
C
/* Copyright (C) 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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#include "gdbsupport/common-defs.h"
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#include "loongarch.h"
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#include <stdlib.h>
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#include <unordered_map>
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/* Target description features. */
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#include "../features/loongarch/base32.c"
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#include "../features/loongarch/base64.c"
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static target_desc_up
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loongarch_create_target_description (const struct loongarch_gdbarch_features features)
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{
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/* Now we should create a new target description. */
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target_desc_up tdesc = allocate_target_description ();
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std::string arch_name = "loongarch";
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if (features.xlen == 4)
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arch_name.append ("32");
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else if (features.xlen == 8)
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arch_name.append ("64");
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set_tdesc_architecture (tdesc.get (), arch_name.c_str ());
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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_loongarch_base32 (tdesc.get (), regnum);
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else if (features.xlen == 8)
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regnum = create_feature_loongarch_base64 (tdesc.get (), regnum);
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return tdesc;
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}
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/* Wrapper used by std::unordered_map to generate hash for feature set. */
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struct loongarch_gdbarch_features_hasher
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{
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std::size_t
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operator() (const loongarch_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<loongarch_gdbarch_features,
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const target_desc_up,
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loongarch_gdbarch_features_hasher> loongarch_tdesc_cache;
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const target_desc *
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loongarch_lookup_target_description (const struct loongarch_gdbarch_features features)
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{
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/* Lookup in the cache. If we find it then return the pointer out of
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the target_desc_up (which is a unique_ptr). This is safe as the
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loongarch_tdesc_cache will exist until GDB exits. */
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const auto it = loongarch_tdesc_cache.find (features);
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if (it != loongarch_tdesc_cache.end ())
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return it->second.get ();
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target_desc_up tdesc (loongarch_create_target_description (features));
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/* Add to the cache, and return a pointer borrowed from the
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target_desc_up. This is safe as the cache (and the pointers
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contained within it) are not deleted until GDB exits. */
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target_desc *ptr = tdesc.get ();
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loongarch_tdesc_cache.emplace (features, std::move (tdesc));
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return ptr;
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}
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