| /* Common target-dependent functionality for LoongArch |
| |
| Copyright (C) 2022-2024 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_USED_NUM_GREGSET = 35, /* 32 GPR, ORIG_A0, PC, BADV. */ |
| 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_USED_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, |
| LOONGARCH_FIRST_LSX_REGNUM = LOONGARCH_FCSR_REGNUM + 1, |
| LOONGARCH_LINUX_NUM_LSXREGSET = 32, |
| LOONGARCH_FIRST_LASX_REGNUM = LOONGARCH_FIRST_LSX_REGNUM + LOONGARCH_LINUX_NUM_LSXREGSET, |
| LOONGARCH_LINUX_NUM_LASXREGSET = 32, |
| |
| LOONGARCH_FIRST_SCR_REGNUM = LOONGARCH_FIRST_LASX_REGNUM + LOONGARCH_LINUX_NUM_LASXREGSET, |
| LOONGARCH_LINUX_NUM_SCR = 4, |
| LOONGARCH_LAST_SCR_REGNUM = LOONGARCH_FIRST_SCR_REGNUM + LOONGARCH_LINUX_NUM_SCR - 1, |
| LOONGARCH_EFLAGS_REGNUM = LOONGARCH_LAST_SCR_REGNUM + 1, |
| LOONGARCH_FTOP_REGNUM = LOONGARCH_EFLAGS_REGNUM + 1, |
| }; |
| |
| enum loongarch_fputype |
| { |
| SINGLE_FLOAT = 1, |
| DOUBLE_FLOAT = 2, |
| }; |
| |
| #define LOONGARCH_LBT_REGS_SIZE (8 * LOONGARCH_LINUX_NUM_SCR + 4 + 4) |
| |
| /* 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 */ |