/* NDS32-specific support for 32-bit ELF.
   Copyright (C) 2012-2020 Free Software Foundation, Inc.
   Contributed by Andes Technology Corporation.

   This file is part of BFD, the Binary File Descriptor library.

   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, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
   02110-1301, USA.  */


#ifndef NDS32_ASM_H
#define NDS32_ASM_H

#ifdef __cplusplus
extern "C" {
#endif

/* Constant values for assembler.  */
enum
{
  /* Error code for assembling an instruction.  */
  NASM_OK = 0,
  NASM_ERR_UNKNOWN_OP,
  NASM_ERR_SYNTAX,
  NASM_ERR_OPERAND,
  NASM_ERR_OUT_OF_RANGE,
  NASM_ERR_REG_REDUCED,
  NASM_ERR_JUNK_EOL,

  /* Results of parse_operand.  */
  NASM_R_CONST,
  NASM_R_SYMBOL,
  NASM_R_ILLEGAL,

  /* Flags for open description.  */
  NASM_OPEN_ARCH_V1		= 0x0,
  NASM_OPEN_ARCH_V2		= 0x1,
  NASM_OPEN_ARCH_V3		= 0x2,
  NASM_OPEN_ARCH_V3M		= 0x3,
  NASM_OPEN_ARCH_MASK		= 0xf,
  NASM_OPEN_REDUCED_REG		= 0x10,

  /* Common attributes.  */
  NASM_ATTR_ISA_V1		= 0x01,
  NASM_ATTR_ISA_V2		= 0x02,
  NASM_ATTR_ISA_V3		= 0x04,
  NASM_ATTR_ISA_V3M		= 0x08,
  NASM_ATTR_ISA_ALL		= 0x0f,

  /* Attributes for instructions.  */
  NASM_ATTR_MAC			= 0x0000100,
  NASM_ATTR_DIV			= 0x0000200,
  NASM_ATTR_FPU			= 0x0000400,
  NASM_ATTR_FPU_SP_EXT		= 0x0000800,
  NASM_ATTR_FPU_DP_EXT		= 0x0001000,
  NASM_ATTR_STR_EXT		= 0x0002000,
  NASM_ATTR_PERF_EXT		= 0x0004000,
  NASM_ATTR_PERF2_EXT		= 0x0008000,
  NASM_ATTR_AUDIO_ISAEXT	= 0x0010000,
  NASM_ATTR_IFC_EXT		= 0x0020000,
  NASM_ATTR_EX9_EXT		= 0x0040000,
  NASM_ATTR_FPU_FMA		= 0x0080000,
  NASM_ATTR_DXREG		= 0x0100000,
  NASM_ATTR_BRANCH		= 0x0200000,
  NASM_ATTR_SATURATION_EXT	= 0x0400000,
  NASM_ATTR_PCREL		= 0x0800000,
  NASM_ATTR_GPREL		= 0x1000000,
  NASM_ATTR_DSP_ISAEXT		= 0x2000000,
  NASM_ATTR_ZOL			= (1 << 26),

  /* Attributes for relocations.  */
  NASM_ATTR_HI20		= 0x10000000,
  NASM_ATTR_LO12		= 0x20000000,
  NASM_ATTR_LO20		= 0x40000000,

  /* Attributes for registers.  */
  NASM_ATTR_RDREG		= 0x000100
};

/* We only support one core for now.  */
#define NDS32_CORE_COUNT	1
#define NDS32_MAIN_CORE		0

enum
{
  /* This operand is used for input or output.  (define or use)  */
  SYN_INPUT = 0x10000,
  SYN_OUTPUT = 0x20000,
  SYN_LOPT = 0x40000,
  SYN_ROPT = 0x80000,

  /* Hardware resources:
     Current set up allows up to 256 resources for each class
     defined above.  */
  HW_GPR = NDS32_MAIN_CORE << 8,
  HW_USR,
  HW_DXR,
  HW_SR,
  HW_FSR,
  HW_FDR,
  HW_CP,	/* Co-processor ID.  */
  HW_CPR,	/* Co-processor registers.  */
  HW_ABDIM,	/* [ab][di]m? flag for LSMWA?.  */
  HW_ABM,	/* [ab]m? flag for LSMWZB.  */
  HW_DTITON,
  HW_DTITOFF,
  HW_DPREF_ST,
  HW_CCTL_ST0,
  HW_CCTL_ST1,
  HW_CCTL_ST2,
  HW_CCTL_ST3,
  HW_CCTL_ST4,
  HW_CCTL_ST5,
  HW_CCTL_LV,
  HW_TLBOP_ST,
  HW_STANDBY_ST,
  HW_MSYNC_ST,
  HW_AEXT_IM_I,
  HW_AEXT_IM_M,
  HW_AEXT_ACC,
  HW_AEXT_ARIDX,
  HW_AEXT_ARIDX2,
  HW_AEXT_ARIDXI,
  HW_AEXT_ARIDXI_MX,
  _HW_LAST,
  HW_INT = 0x1000,
  HW_UINT
};

/* for audio-extension.  */
enum
{
  N32_AEXT_AMADD = 0,
  N32_AEXT_AMSUB,
  N32_AEXT_AMULT,
  N32_AEXT_AMFAR,
  N32_AEXT_AMADDS,
  N32_AEXT_AMSUBS,
  N32_AEXT_AMULTS,
  N32_AEXT_AMNEGS,
  N32_AEXT_AADDL,
  N32_AEXT_AMTARI,
  N32_AEXT_AMAWBS = 0x0c,
  N32_AEXT_AMAWTS,
  N32_AEXT_AMWBS,
  N32_AEXT_AMWTS,
  N32_AEXT_AMABBS,
  N32_AEXT_AMABTS,
  N32_AEXT_AMATBS,
  N32_AEXT_AMATTS,
  N32_AEXT_AMBBS,
  N32_AEXT_AMBTS,
  N32_AEXT_AMTBS,
  N32_AEXT_AMTTS
};

/* Macro for instruction attribute.  */
#define ATTR(attr)		NASM_ATTR_ ## attr
#define ATTR_NONE		0
#define ATTR_PCREL		(ATTR (PCREL) | ATTR (BRANCH))

#define ATTR_ALL		(ATTR (ISA_ALL))
#define ATTR_V2UP		(ATTR_ALL & ~(ATTR (ISA_V1)))
#define ATTR_V3MUP		(ATTR (ISA_V3) | ATTR (ISA_V3M))
#define ATTR_V3			(ATTR (ISA_V3))
#define ATTR_V3MEX_V1		(ATTR_ALL & ~(ATTR (ISA_V3M)))
#define ATTR_V3MEX_V2		(ATTR_V2UP & ~(ATTR (ISA_V3M)))

/* Lexical element in parsed syntax.  */
typedef int lex_t;

/* Common header for hash entries.  */
struct nds32_hash_entry
{
  const char *name;
};

typedef struct nds32_keyword
{
  const char *name;
  int value;
  uint64_t attr;
} keyword_t;

typedef struct nds32_opcode
{
  /* Opcode for the instruction.  */
  const char *opcode;
  /* Human readable string of this instruction.  */
  const char *instruction;
  /* Base value of this instruction.  */
  uint32_t value;
  /* The byte-size of the instruction.  */
  int isize;
  /* Attributes of this instruction.  */
  uint64_t attr;
  /* Implicit define/use.  */
  uint64_t defuse;
  /* Parsed string for assembling.  */
  lex_t *syntax;
  /* Number of variant.  */
  int variant;
  /* Next form of the same mnemonic.  */
  struct nds32_opcode *next;

  /* TODO: Extra constrains and verification.
	   For example, `mov55 $sp, $sp' is not allowed in v3.  */
} opcode_t;

typedef struct nds32_asm_insn
{
  /* Assembled instruction bytes.  */
  uint32_t insn;
  /* The opcode structure for this instruction.  */
  struct nds32_opcode *opcode;
  /* The field need special fix-up, used for relocation.  */
  const struct nds32_field *field;
  /* Attributes for relocation.  */
  uint64_t attr;
  /* Application-dependent data, e.g., expression.  */
  void *info;
  /* Input/output registers.  */
  uint64_t defuse;
} nds32_asm_insn_t;

typedef struct nds32_asm_desc
{
  /* The callback provided by assembler user for parse an operand,
     e.g., parse integer.  */
  int (*parse_operand) (struct nds32_asm_desc *,
			struct nds32_asm_insn *,
			char **, int64_t *);

  /* Result of assembling.  */
  int result;

  /* The mach for this assembling.  */
  int mach;

  int flags;
} nds32_asm_desc_t;

/* The field information for an operand.  */
typedef struct nds32_field
{
  /* Name of the field.  */
  const char *name;

  int bitpos;
  int bitsize;
  int shift;
  int hw_res;

  int (*parse) (struct nds32_asm_desc *,
		struct nds32_asm_insn *,
		char **, int64_t *);
} field_t;

extern void nds32_assemble (nds32_asm_desc_t *, nds32_asm_insn_t *, char *);
extern void nds32_asm_init (nds32_asm_desc_t *, int);

#define OP6(op6)	(N32_OP6_ ## op6 << 25)

#define LSMW(sub)	(OP6 (LSMW) | N32_LSMW_ ## sub)
#define JREG(sub)	(OP6 (JREG) | N32_JREG_ ## sub)
#define JREG_RET	(1 << 5)
#define JREG_IFC	(1 << 6)
#define BR2(sub)	(OP6 (BR2) | (N32_BR2_ ## sub << 16))
#define SIMD(sub)	(OP6 (SIMD) | N32_SIMD_ ## sub)
#define ALU1(sub)	(OP6 (ALU1) | N32_ALU1_ ## sub)
#define ALU2(sub)	(OP6 (ALU2) | N32_ALU2_ ## sub)
#define ALU2_1(sub)	(OP6 (ALU2) | N32_BIT (6) | N32_ALU2_ ## sub)
#define ALU2_2(sub)	(OP6 (ALU2) | N32_BIT (7) | N32_ALU2_ ## sub)
#define ALU2_3(sub)	(OP6 (ALU2) | N32_BIT (6) | N32_BIT (7) | N32_ALU2_ ## sub)
#define MISC(sub)	(OP6 (MISC) | N32_MISC_ ## sub)
#define MEM(sub)	(OP6 (MEM) | N32_MEM_ ## sub)
#define FPU_RA_IMMBI(sub)	(OP6 (sub) | N32_BIT (12))
#define FS1(sub)	(OP6 (COP) | N32_FPU_FS1 | (N32_FPU_FS1_ ## sub << 6))
#define FS1_F2OP(sub)	(OP6 (COP) | N32_FPU_FS1 | (N32_FPU_FS1_F2OP << 6) \
			| (N32_FPU_FS1_F2OP_ ## sub << 10))
#define FS2(sub) 	(OP6 (COP) | N32_FPU_FS2 | (N32_FPU_FS2_ ## sub << 6))
#define FD1(sub)	(OP6 (COP) | N32_FPU_FD1 | (N32_FPU_FD1_ ## sub << 6))
#define FD1_F2OP(sub)	(OP6 (COP) | N32_FPU_FD1 | (N32_FPU_FD1_F2OP << 6) \
			| (N32_FPU_FD1_F2OP_ ## sub << 10))
#define FD2(sub)	(OP6 (COP) | N32_FPU_FD2 | (N32_FPU_FD2_ ## sub << 6))
#define MFCP(sub)	(OP6 (COP) | N32_FPU_MFCP | (N32_FPU_MFCP_ ## sub << 6))
#define MFCP_XR(sub)	(OP6 (COP) | N32_FPU_MFCP | (N32_FPU_MFCP_XR << 6) \
			| (N32_FPU_MFCP_XR_ ## sub << 10))
#define MTCP(sub)	(OP6 (COP) | N32_FPU_MTCP | (N32_FPU_MTCP_ ## sub << 6))
#define MTCP_XR(sub)	(OP6 (COP) | N32_FPU_MTCP | (N32_FPU_MTCP_XR << 6) \
			| (N32_FPU_MTCP_XR_ ## sub << 10))
#define FPU_MEM(sub)	(OP6 (COP) | N32_FPU_ ## sub)
#define FPU_MEMBI(sub)	(OP6 (COP) | N32_FPU_ ## sub | 0x1 << 7)
#define AUDIO(sub)	(OP6 (AEXT) | (N32_AEXT_ ## sub << 20))

#ifdef __cplusplus
}
#endif

#endif
