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/* Target-dependent header for the Nios II architecture, for GDB.
Copyright (C) 2012-2020 Free Software Foundation, Inc.
Contributed by Mentor Graphics, 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 NIOS2_TDEP_H
#define NIOS2_TDEP_H
/* Nios II ISA specific encodings and macros. */
#include "opcode/nios2.h"
/* Registers. */
#define NIOS2_Z_REGNUM 0 /* Zero */
#define NIOS2_R2_REGNUM 2 /* used for return value */
#define NIOS2_R3_REGNUM 3 /* used for return value */
/* Used for hidden zero argument to store ptr to struct return value. */
#define NIOS2_R4_REGNUM 4
#define NIOS2_R7_REGNUM 7
#define NIOS2_GP_REGNUM 26 /* Global Pointer */
#define NIOS2_SP_REGNUM 27 /* Stack Pointer */
#define NIOS2_FP_REGNUM 28 /* Frame Pointer */
#define NIOS2_EA_REGNUM 29 /* Exception address */
#define NIOS2_BA_REGNUM 30 /* Breakpoint return address */
#define NIOS2_RA_REGNUM 31 /* Return address */
#define NIOS2_PC_REGNUM 32
/* Control registers. */
#define NIOS2_STATUS_REGNUM 33
#define NIOS2_ESTATUS_REGNUM 34
#define NIOS2_BSTATUS_REGNUM 35
#define NIOS2_IENABLE_REGNUM 36
#define NIOS2_IPENDING_REGNUM 37
#define NIOS2_CPUID_REGNUM 38
#define NIOS2_EXCEPTION_REGNUM 40
#define NIOS2_PTEADDR_REGNUM 41
#define NIOS2_TLBACC_REGNUM 42
#define NIOS2_TLBMISC_REGNUM 43
#define NIOS2_ECCINJ_REGNUM 44
#define NIOS2_BADADDR_REGNUM 45
#define NIOS2_CONFIG_REGNUM 46
#define NIOS2_MPUBASE_REGNUM 47
#define NIOS2_MPUACC_REGNUM 48
/* R4-R7 are used for argument passing. */
#define NIOS2_FIRST_ARGREG NIOS2_R4_REGNUM
#define NIOS2_LAST_ARGREG NIOS2_R7_REGNUM
/* Number of all registers. */
#define NIOS2_NUM_REGS 49
/* Size of an instruction, in bytes. */
#define NIOS2_OPCODE_SIZE 4
#define NIOS2_CDX_OPCODE_SIZE 2
/* Target-dependent structure in gdbarch. */
struct gdbarch_tdep
{
/* Assumes FRAME is stopped at a syscall (trap) instruction; returns
the expected next PC. */
CORE_ADDR (*syscall_next_pc) (struct frame_info *frame,
const struct nios2_opcode *op);
/* Returns true if PC points to a kernel helper function. */
bool (*is_kernel_helper) (CORE_ADDR pc);
/* Offset to PC value in jump buffer.
If this is negative, longjmp support will be disabled. */
int jb_pc;
};
extern struct target_desc *tdesc_nios2_linux;
extern struct target_desc *tdesc_nios2;
#endif /* NIOS2_TDEP_H */
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