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nios2-tdep.h
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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. */
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
87extern const struct target_desc *tdesc_nios2_linux;
88extern const struct target_desc *tdesc_nios2;
89
90#endif /* NIOS2_TDEP_H */
const struct target_desc * tdesc_nios2
Definition nios2.c:8
const struct target_desc * tdesc_nios2_linux
CORE_ADDR(* syscall_next_pc)(frame_info_ptr frame, const struct nios2_opcode *op)
Definition nios2-tdep.h:76
bool(* is_kernel_helper)(CORE_ADDR pc)
Definition nios2-tdep.h:80