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/* Copyright (C) 2018-2021 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
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 <>. */
#include "gdbsupport/common-defs.h"
#include "riscv.h"
#include <stdlib.h>
#include <unordered_map>
#include "../features/riscv/32bit-cpu.c"
#include "../features/riscv/64bit-cpu.c"
#include "../features/riscv/32bit-fpu.c"
#include "../features/riscv/64bit-fpu.c"
#include "../features/riscv/rv32e-xregs.c"
#define STATIC_IN_GDB static
/* See arch/riscv.h. */
STATIC_IN_GDB target_desc_up
riscv_create_target_description (const struct riscv_gdbarch_features features)
/* Now we should create a new target description. */
target_desc_up tdesc = allocate_target_description ();
std::string arch_name = "riscv";
if (features.xlen == 4)
if (features.embedded)
arch_name.append (":rv32e");
arch_name.append (":rv32i");
else if (features.xlen == 8)
arch_name.append (":rv64i");
else if (features.xlen == 16)
arch_name.append (":rv128i");
if (features.flen == 4)
arch_name.append ("f");
else if (features.flen == 8)
arch_name.append ("d");
else if (features.flen == 16)
arch_name.append ("q");
set_tdesc_architecture (tdesc.get (), arch_name.c_str ());
long regnum = 0;
/* For now we only support creating 32-bit or 64-bit x-registers. */
if (features.xlen == 4)
if (features.embedded)
regnum = create_feature_riscv_rv32e_xregs (tdesc.get (), regnum);
regnum = create_feature_riscv_32bit_cpu (tdesc.get (), regnum);
else if (features.xlen == 8)
regnum = create_feature_riscv_64bit_cpu (tdesc.get (), regnum);
/* For now we only support creating 32-bit or 64-bit f-registers. */
if (features.flen == 4)
regnum = create_feature_riscv_32bit_fpu (tdesc.get (), regnum);
else if (features.flen == 8)
regnum = create_feature_riscv_64bit_fpu (tdesc.get (), regnum);
/* Currently GDB only supports vector features coming from remote
targets. We don't support creating vector features on native targets
(yet). */
if (features.vlen != 0)
error (_("unable to create vector feature"));
return tdesc;
/* Wrapper used by std::unordered_map to generate hash for feature set. */
struct riscv_gdbarch_features_hasher
operator() (const riscv_gdbarch_features &features) const noexcept
return features.hash ();
/* Cache of previously seen target descriptions, indexed by the feature set
that created them. */
static std::unordered_map<riscv_gdbarch_features,
const target_desc_up,
riscv_gdbarch_features_hasher> riscv_tdesc_cache;
/* See arch/riscv.h. */
const target_desc *
riscv_lookup_target_description (const struct riscv_gdbarch_features features)
/* Lookup in the cache. If we find it then return the pointer out of
the target_desc_up (which is a unique_ptr). This is safe as the
riscv_tdesc_cache will exist until GDB exits. */
const auto it = riscv_tdesc_cache.find (features);
if (it != riscv_tdesc_cache.end ())
return it->second.get ();
target_desc_up tdesc (riscv_create_target_description (features));
/* Add to the cache, and return a pointer borrowed from the
target_desc_up. This is safe as the cache (and the pointers
contained within it) are not deleted until GDB exits. */
target_desc *ptr = tdesc.get ();
riscv_tdesc_cache.emplace (features, std::move (tdesc));
return ptr;
#endif /* !GDBSERVER */