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/* 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"
/* Register numbers of various important registers. */
enum loongarch_regnum
{
LOONGARCH_RA_REGNUM = 1, /* Return Address. */
LOONGARCH_SP_REGNUM = 3, /* Stack Pointer. */
LOONGARCH_A0_REGNUM = 4, /* First Argument/Return Value. */
LOONGARCH_A7_REGNUM = 11, /* Seventh Argument/Syscall Number. */
LOONGARCH_FP_REGNUM = 22, /* Frame Pointer. */
LOONGARCH_ORIG_A0_REGNUM = 32, /* Syscall's original arg0. */
LOONGARCH_PC_REGNUM = 33, /* Program Counter. */
LOONGARCH_BADV_REGNUM = 34, /* Bad Vaddr for Addressing Exception. */
LOONGARCH_LINUX_NUM_GREGSET = 45, /* 32 GPR, ORIG_A0, PC, BADV, RESERVED 10. */
LOONGARCH_ARG_REGNUM = 8, /* r4-r11: general-purpose argument registers.
f0-f7: floating-point argument registers. */
LOONGARCH_FIRST_FP_REGNUM = LOONGARCH_LINUX_NUM_GREGSET,
LOONGARCH_LINUX_NUM_FPREGSET = 32,
LOONGARCH_FIRST_FCC_REGNUM = LOONGARCH_FIRST_FP_REGNUM + LOONGARCH_LINUX_NUM_FPREGSET,
LOONGARCH_LINUX_NUM_FCC = 8,
LOONGARCH_FCSR_REGNUM = LOONGARCH_FIRST_FCC_REGNUM + LOONGARCH_LINUX_NUM_FCC,
};
enum loongarch_fputype
{
SINGLE_FLOAT = 1,
DOUBLE_FLOAT = 2,
};
/* 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;
/* The type of floating-point. This is either 1 (single float) or 2
(double float). No other value is valid. Initialise to the invalid
0 value so we can spot if one of these is used uninitialised. */
int fputype = 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;
}
};
#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 loongarch_create_target_description
(const struct loongarch_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 *loongarch_lookup_target_description
(const struct loongarch_gdbarch_features features);
#endif /* GDBSERVER */
#endif /* ARCH_LOONGARCH_H */
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