gdb/riscv-tdep.h

/* Target-dependent header for the RISC-V architecture, for GDB, the
   GNU Debugger.

   Copyright (C) 2018 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 RISCV_TDEP_H
#define RISCV_TDEP_H

#include "arch/riscv.h"

/* RiscV register numbers.  */
enum
{
  RISCV_ZERO_REGNUM = 0,	/* Read-only register, always 0.  */
  RISCV_RA_REGNUM = 1,		/* Return Address.  */
  RISCV_SP_REGNUM = 2,		/* Stack Pointer.  */
  RISCV_GP_REGNUM = 3,		/* Global Pointer.  */
  RISCV_TP_REGNUM = 4,		/* Thread Pointer.  */
  RISCV_FP_REGNUM = 8,		/* Frame Pointer.  */
  RISCV_A0_REGNUM = 10,		/* First argument.  */
  RISCV_A1_REGNUM = 11,		/* Second argument.  */
  RISCV_PC_REGNUM = 32,		/* Program Counter.  */

  RISCV_NUM_INTEGER_REGS = 32,

  RISCV_FIRST_FP_REGNUM = 33,	/* First Floating Point Register */
  RISCV_FA0_REGNUM = 43,
  RISCV_FA1_REGNUM = RISCV_FA0_REGNUM + 1,
  RISCV_LAST_FP_REGNUM = 64,	/* Last Floating Point Register */

  RISCV_FIRST_CSR_REGNUM = 65,  /* First CSR */
#define DECLARE_CSR(name, num) \
  RISCV_ ## num ## _REGNUM = RISCV_FIRST_CSR_REGNUM + num,
#include "opcode/riscv-opc.h"
#undef DECLARE_CSR
  RISCV_LAST_CSR_REGNUM = 4160,
  RISCV_CSR_LEGACY_MISA_REGNUM = 0xf10 + RISCV_FIRST_CSR_REGNUM,

  RISCV_PRIV_REGNUM = 4161,

  RISCV_LAST_REGNUM = RISCV_PRIV_REGNUM
};

/* RISC-V specific per-architecture information.  */
struct gdbarch_tdep
{
  /* Features about the target that impact how the gdbarch is configured.
     Two gdbarch instances are compatible only if this field matches.  */
  struct riscv_gdbarch_features features;

  /* ISA-specific data types.  */
  struct type *riscv_fpreg_d_type = nullptr;
};


/* Return the width in bytes  of the general purpose registers for GDBARCH.
   Possible return values are 4, 8, or 16 for RiscV variants RV32, RV64, or
   RV128.  */
extern int riscv_isa_xlen (struct gdbarch *gdbarch);

/* Return the width in bytes of the floating point registers for GDBARCH.
   If this architecture has no floating point registers, then return 0.
   Possible values are 4, 8, or 16 for depending on which of single, double
   or quad floating point support is available.  */
extern int riscv_isa_flen (struct gdbarch *gdbarch);

/* Single step based on where the current instruction will take us.  */
extern std::vector<CORE_ADDR> riscv_software_single_step
  (struct regcache *regcache);

#endif /* RISCV_TDEP_H */