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Diffstat (limited to 'gdb/arch/loongarch.h')
-rw-r--r-- | gdb/arch/loongarch.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/gdb/arch/loongarch.h b/gdb/arch/loongarch.h new file mode 100644 index 00000000000..9e10df967d1 --- /dev/null +++ b/gdb/arch/loongarch.h @@ -0,0 +1,73 @@ +/* Common target-dependent functionality for LoongArch + + Copyright (C) 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_LOONGARCH_H +#define ARCH_LOONGARCH_H + +#include "gdbsupport/tdesc.h" + +/* The set of LoongArch 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 + LoongArch 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 loongarch_gdbarch_features +{ + /* The size of the x-registers in bytes. This is either 4 (loongarch32) + or 8 (loongarch64). 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; + + /* Equality operator. */ + bool operator== (const struct loongarch_gdbarch_features &rhs) const + { + return (xlen == rhs.xlen); + } + + /* Inequality operator. */ + bool operator!= (const struct loongarch_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; + return val; + } +}; + +/* 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 *loongarch_lookup_target_description + (const struct loongarch_gdbarch_features features); + +#endif /* ARCH_LOONGARCH_H */ |