1 /* Target-dependent header for the Nios II architecture, for GDB. 2 Copyright (C) 2012-2023 Free Software Foundation, Inc. 3 Contributed by Mentor Graphics, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19 20 #ifndef NIOS2_TDEP_H 21 #define NIOS2_TDEP_H 22 23 #include "gdbarch.h" 24 25 /* Nios II ISA specific encodings and macros. */ 26 #include "opcode/nios2.h" 27 28 /* Registers. */ 29 #define NIOS2_Z_REGNUM 0 /* Zero */ 30 #define NIOS2_R2_REGNUM 2 /* used for return value */ 31 #define NIOS2_R3_REGNUM 3 /* used for return value */ 32 /* Used for hidden zero argument to store ptr to struct return value. */ 33 #define NIOS2_R4_REGNUM 4 34 #define NIOS2_R7_REGNUM 7 35 #define NIOS2_GP_REGNUM 26 /* Global Pointer */ 36 #define NIOS2_SP_REGNUM 27 /* Stack Pointer */ 37 #define NIOS2_FP_REGNUM 28 /* Frame Pointer */ 38 #define NIOS2_EA_REGNUM 29 /* Exception address */ 39 #define NIOS2_BA_REGNUM 30 /* Breakpoint return address */ 40 #define NIOS2_RA_REGNUM 31 /* Return address */ 41 #define NIOS2_PC_REGNUM 32 42 43 /* Control registers. */ 44 #define NIOS2_STATUS_REGNUM 33 45 #define NIOS2_ESTATUS_REGNUM 34 46 #define NIOS2_BSTATUS_REGNUM 35 47 #define NIOS2_IENABLE_REGNUM 36 48 #define NIOS2_IPENDING_REGNUM 37 49 #define NIOS2_CPUID_REGNUM 38 50 #define NIOS2_EXCEPTION_REGNUM 40 51 #define NIOS2_PTEADDR_REGNUM 41 52 #define NIOS2_TLBACC_REGNUM 42 53 #define NIOS2_TLBMISC_REGNUM 43 54 #define NIOS2_ECCINJ_REGNUM 44 55 #define NIOS2_BADADDR_REGNUM 45 56 #define NIOS2_CONFIG_REGNUM 46 57 #define NIOS2_MPUBASE_REGNUM 47 58 #define NIOS2_MPUACC_REGNUM 48 59 60 /* R4-R7 are used for argument passing. */ 61 #define NIOS2_FIRST_ARGREG NIOS2_R4_REGNUM 62 #define NIOS2_LAST_ARGREG NIOS2_R7_REGNUM 63 64 /* Number of all registers. */ 65 #define NIOS2_NUM_REGS 49 66 67 /* Size of an instruction, in bytes. */ 68 #define NIOS2_OPCODE_SIZE 4 69 #define NIOS2_CDX_OPCODE_SIZE 2 70 71 /* Target-dependent structure in gdbarch. */ 72 struct nios2_gdbarch_tdep : gdbarch_tdep_base 73 { 74 /* Assumes FRAME is stopped at a syscall (trap) instruction; returns 75 the expected next PC. */ 76 CORE_ADDR (*syscall_next_pc) (frame_info_ptr frame, 77 const struct nios2_opcode *op) = nullptr; 78 79 /* Returns true if PC points to a kernel helper function. */ 80 bool (*is_kernel_helper) (CORE_ADDR pc) = nullptr; 81 82 /* Offset to PC value in jump buffer. 83 If this is negative, longjmp support will be disabled. */ 84 int jb_pc = 0; 85 }; 86 87 extern const struct target_desc *tdesc_nios2_linux; 88 extern const struct target_desc *tdesc_nios2; 89 90 #endif /* NIOS2_TDEP_H */ 91