gdb/nios2-tdep.h

   1 /* Target-dependent header for the Nios II architecture, for GDB.
   2    Copyright (C) 2012-2020 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 /* Nios II ISA specific encodings and macros.  */
  24 #include "opcode/nios2.h"
  25
  26 /* Registers.  */
  27 #define NIOS2_Z_REGNUM 0     /* Zero */
  28 #define NIOS2_R2_REGNUM 2    /* used for return value */
  29 #define NIOS2_R3_REGNUM 3    /* used for return value */
  30 /* Used for hidden zero argument to store ptr to struct return value.  */
  31 #define NIOS2_R4_REGNUM 4
  32 #define NIOS2_R7_REGNUM 7
  33 #define NIOS2_GP_REGNUM 26  /* Global Pointer */
  34 #define NIOS2_SP_REGNUM 27  /* Stack Pointer */
  35 #define NIOS2_FP_REGNUM 28  /* Frame Pointer */
  36 #define NIOS2_EA_REGNUM 29  /* Exception address */
  37 #define NIOS2_BA_REGNUM 30  /* Breakpoint return address */
  38 #define NIOS2_RA_REGNUM 31  /* Return address */
  39 #define NIOS2_PC_REGNUM 32
  40
  41 /* Control registers.  */
  42 #define NIOS2_STATUS_REGNUM 33
  43 #define NIOS2_ESTATUS_REGNUM 34
  44 #define NIOS2_BSTATUS_REGNUM 35
  45 #define NIOS2_IENABLE_REGNUM 36
  46 #define NIOS2_IPENDING_REGNUM 37
  47 #define NIOS2_CPUID_REGNUM 38
  48 #define NIOS2_EXCEPTION_REGNUM 40
  49 #define NIOS2_PTEADDR_REGNUM 41
  50 #define NIOS2_TLBACC_REGNUM 42
  51 #define NIOS2_TLBMISC_REGNUM 43
  52 #define NIOS2_ECCINJ_REGNUM 44
  53 #define NIOS2_BADADDR_REGNUM 45
  54 #define NIOS2_CONFIG_REGNUM 46
  55 #define NIOS2_MPUBASE_REGNUM 47
  56 #define NIOS2_MPUACC_REGNUM 48
  57
  58 /* R4-R7 are used for argument passing.  */
  59 #define NIOS2_FIRST_ARGREG NIOS2_R4_REGNUM
  60 #define NIOS2_LAST_ARGREG NIOS2_R7_REGNUM
  61
  62 /* Number of all registers.  */
  63 #define NIOS2_NUM_REGS 49
  64
  65 /* Size of an instruction, in bytes.  */
  66 #define NIOS2_OPCODE_SIZE 4
  67 #define NIOS2_CDX_OPCODE_SIZE 2
  68
  69 /* Target-dependent structure in gdbarch.  */
  70 struct gdbarch_tdep
  71 {
  72   /* Assumes FRAME is stopped at a syscall (trap) instruction; returns
  73      the expected next PC.  */
  74   CORE_ADDR (*syscall_next_pc) (struct frame_info *frame,
  75                                 const struct nios2_opcode *op);
  76
  77   /* Returns true if PC points to a kernel helper function.  */
  78   bool (*is_kernel_helper) (CORE_ADDR pc);
  79
  80   /* Offset to PC value in jump buffer.
  81      If this is negative, longjmp support will be disabled.  */
  82   int jb_pc;
  83 };
  84
  85 extern struct target_desc *tdesc_nios2_linux;
  86 extern struct target_desc *tdesc_nios2;
  87
  88 #endif /* NIOS2_TDEP_H */