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binutils-gdb/opcodes/maxq-dis.c

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/* Instruction printing code for the MAXQ
Copyright 2004, 2005 Free Software Foundation, Inc.
Written by Vineet Sharma(vineets@noida.hcltech.com) Inderpreet
S.(inderpreetb@noida.hcltech.com)
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 2 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. */
#include "sysdep.h"
#include "dis-asm.h"
#include "opcode/maxq.h"
struct _group_info
{
unsigned char group_no;
unsigned char sub_opcode;
unsigned char src;
unsigned char dst;
unsigned char fbit;
unsigned char bit_no;
unsigned char flag;
};
typedef struct _group_info group_info;
#define SRC 0x01
#define DST 0x02
#define FORMAT 0x04
#define BIT_NO 0x08
#define SUB_OP 0x10
#define MASK_LOW_BYTE 0x0f
#define MASK_HIGH_BYTE 0xf0
/* Flags for retrieving the bits from the op-code. */
#define _DECODE_LOWNIB_LOWBYTE 0x000f
#define _DECODE_HIGHNIB_LOWBYTE 0x00f0
#define _DECODE_LOWNIB_HIGHBYTE 0x0f00
#define _DECODE_HIGHNIB_HIGHBYTE 0xf000
#define _DECODE_HIGHBYTE 0xff00
#define _DECODE_LOWBYTE 0x00ff
#define _DECODE_4TO6_HIGHBYTE 0x7000
#define _DECODE_4TO6_LOWBYTE 0x0070
#define _DECODE_0TO6_HIGHBYTE 0x7f00
#define _DECODE_0TO2_HIGHBYTE 0x0700
#define _DECODE_GET_F_HIGHBYTE 0x8000
#define _DECODE_BIT7_HIGHBYTE 0x8000
#define _DECODE_BIT7_LOWBYTE 0x0080
#define _DECODE_GET_CARRY 0x10000
#define _DECODE_BIT0_LOWBYTE 0x1
#define _DECODE_BIT6AND7_HIGHBYTE 0xc000
/* Module and Register Indexed of System Registers. */
#define _CURR_ACC_MODINDEX 0xa
#define _CURR_ACC_REGINDEX 0x0
#define _PSF_REG_MODINDEX 0x8
#define _PSF_REG_REGINDEX 0x4
#define _PFX_REG_MODINDEX 0xb
#define _PFX0_REG_REGINDEX 0x0
#define _PFX2_REG_REGINDEX 0x2
#define _DP_REG_MODINDEX 0xf
#define _DP0_REG_REGINDEX 0x3
#define _DP1_REG_REGINDEX 0x7
#define _IP_REG_MODINDEX 0xc
#define _IP_REG_REGINDEX 0x0
#define _IIR_REG_MODINDEX 0x8
#define _IIR_REG_REGINDEX 0xb
#define _SP_REG_MODINDEX 0xd
#define _SP_REG_REGINDEX 0x1
#define _IC_REG_MODINDEX 0x8
#define _IC_REG_REGINDEX 0x5
#define _LC_REG_MODINDEX 0xe
#define _LC0_REG_REGINDEX 0x0
#define _LC1_REG_REGINDEX 0x1
#define _LC2_REG_REGINDEX 0x2
#define _LC3_REG_REGINDEX 0x3
/* Flags for finding the bits in PSF Register. */
#define SIM_ALU_DECODE_CARRY_BIT_POS 0x2
#define SIM_ALU_DECODE_SIGN_BIT_POS 0x40
#define SIM_ALU_DECODE_ZERO_BIT_POS 0x80
#define SIM_ALU_DECODE_EQUAL_BIT_POS 0x1
#define SIM_ALU_DECODE_IGE_BIT_POS 0x1
/* Number Of Op-code Groups. */
unsigned char const SIM_ALU_DECODE_OPCODE_GROUPS = 11;
/* Op-code Groups. */
unsigned char const SIM_ALU_DECODE_LOGICAL_XCHG_OP_GROUP = 1;
/* Group1: AND/OR/XOR/ADD/SUB Operations: fxxx 1010 ssss ssss. */
unsigned char const SIM_ALU_DECODE_AND_OR_ADD_SUB_OP_GROUP = 2;
/* Group2: Logical Operations: 1000 1010 xxxx 1010. */
unsigned char const SIM_ALU_DECODE_BIT_OP_GROUP = 3;
/* XCHG/Bit Operations: 1xxx 1010 xxxx 1010. */
unsigned char const SIM_ALU_DECODE_SET_DEST_BIT_GROUP = 4;
/* Move value in bit of destination register: 1ddd dddd xbbb 0111. */
unsigned char const SIM_ALU_DECODE_JUMP_OP_GROUP = 5;
#define JUMP_CHECK(insn) \
( ((insn & _DECODE_4TO6_HIGHBYTE) == 0x0000) \
|| ((insn & _DECODE_4TO6_HIGHBYTE) == 0x2000) \
|| ((insn & _DECODE_4TO6_HIGHBYTE) == 0x6000) \
|| ((insn & _DECODE_4TO6_HIGHBYTE) == 0x1000) \
|| ((insn & _DECODE_4TO6_HIGHBYTE) == 0x5000) \
|| ((insn & _DECODE_4TO6_HIGHBYTE) == 0x3000) \
|| ((insn & _DECODE_4TO6_HIGHBYTE) == 0x7000) \
|| ((insn & _DECODE_4TO6_HIGHBYTE) == 0x4000) )
/* JUMP operations: fxxx 1100 ssss ssss */
unsigned char const SIM_ALU_DECODE_RET_OP_GROUP = 6;
/* RET Operations: 1xxx 1100 0000 1101 */
unsigned char const SIM_ALU_DECODE_MOVE_SRC_DST_GROUP = 7;
/* Move src into dest register: fddd dddd ssss ssss */
unsigned char const SIM_ALU_DECODE_SET_SRC_BIT_GROUP = 8;
/* Move value in bit of source register: fbbb 0111 ssss ssss */
unsigned char const SIM_ALU_DECODE_DJNZ_CALL_PUSH_OP_GROUP = 9;
/* PUSH, DJNZ and CALL operations: fxxx 1101 ssss ssss */
unsigned char const SIM_ALU_DECODE_POP_OP_GROUP = 10;
/* POP operation: 1ddd dddd 0000 1101 */
unsigned char const SIM_ALU_DECODE_CMP_SRC_OP_GROUP = 11;
/* GLOBAL */
char unres_reg_name[20];
static char *
get_reg_name (unsigned char reg_code, type1 arg_pos)
{
unsigned char module;
unsigned char index;
int ix = 0;
reg_entry const *reg_x;
mem_access_syntax const *syntax;
mem_access *mem_acc;
module = 0;
index = 0;
module = (reg_code & MASK_LOW_BYTE);
index = (reg_code & MASK_HIGH_BYTE);
index = index >> 4;
/* Search the system register table. */
for (reg_x = &system_reg_table[0]; reg_x->reg_name != NULL; ++reg_x)
if ((reg_x->Mod_name == module) && (reg_x->Mod_index == index))
return reg_x->reg_name;
/* Serch pheripheral table. */
for (ix = 0; ix < num_of_reg; ix++)
{
reg_x = &new_reg_table[ix];
if ((reg_x->Mod_name == module) && (reg_x->Mod_index == index))
return reg_x->reg_name;
}
for (mem_acc = &mem_table[0]; mem_acc->name != NULL || !mem_acc; ++mem_acc)
{
if (reg_code == mem_acc->opcode)
{
for (syntax = mem_access_syntax_table;
mem_access_syntax_table != NULL || mem_access_syntax_table->name;
++syntax)
if (!strcmp (mem_acc->name, syntax->name))
{
if ((arg_pos == syntax->type) || (syntax->type == BOTH))
return mem_acc->name;
break;
}
}
}
memset (unres_reg_name, 0, 20);
sprintf (unres_reg_name, "%01x%01xh", index, module);
return unres_reg_name;
}
static bfd_boolean
check_move (unsigned char insn0, unsigned char insn8)
{
bfd_boolean first = FALSE;
bfd_boolean second = FALSE;
char *first_reg;
char *second_reg;
reg_entry const *reg_x;
const unsigned char module1 = insn0 & MASK_LOW_BYTE;
const unsigned char index1 = ((insn0 & 0x70) >> 4);
const unsigned char module2 = insn8 & MASK_LOW_BYTE;
const unsigned char index2 = ((insn8 & MASK_HIGH_BYTE) >> 4);
/* DST */
if (((insn0 & MASK_LOW_BYTE) == MASK_LOW_BYTE)
&& ((index1 == 0) || (index1 == 1) || (index1 == 2) || (index1 == 5)
|| (index1 == 4) || (index1 == 6)))
first = TRUE;
else if (((insn0 & MASK_LOW_BYTE) == 0x0D) && (index1 == 0))
first = TRUE;
else if ((module1 == 0x0E)
&& ((index1 == 0) || (index1 == 1) || (index1 == 2)))
first = TRUE;
else
{
for (reg_x = &system_reg_table[0]; reg_x->reg_name != NULL && reg_x;
++reg_x)
{
if ((reg_x->Mod_name == module1) && (reg_x->Mod_index == index1)
&& ((reg_x->rtype == Reg_16W) || (reg_x->rtype == Reg_8W)))
{
/* IP not allowed. */
if ((reg_x->Mod_name == 0x0C) && (reg_x->Mod_index == 0x00))
continue;
/* A[AP] not allowed. */
if ((reg_x->Mod_name == 0x0A) && (reg_x->Mod_index == 0x01))
continue;
first_reg = reg_x->reg_name;
first = TRUE;
break;
}
}
}
if (!first)
/* No need to check further. */
return FALSE;
if (insn0 & 0x80)
{
/* SRC */
if (((insn8 & MASK_LOW_BYTE) == MASK_LOW_BYTE)
&& ((index2 == 0) || (index2 == 1) || (index2 == 2) || (index2 == 4)
|| (index2 == 5) || (index2 == 6)))
second = TRUE;
else if (((insn8 & MASK_LOW_BYTE) == 0x0D) && (index2 == 0))
second = TRUE;
else if ((module2 == 0x0E)
&& ((index2 == 0) || (index2 == 1) || (index2 == 2)))
second = TRUE;
else
{
for (reg_x = &system_reg_table[0];
reg_x->reg_name != NULL && reg_x;
++reg_x)
{
if ((reg_x->Mod_name == (insn8 & MASK_LOW_BYTE))
&& (reg_x->Mod_index == (((insn8 & 0xf0) >> 4))))
{
second = TRUE;
second_reg = reg_x->reg_name;
break;
}
}
}
if (second)
{
if ((module1 == 0x0A && index1 == 0x0)
&& (module2 == 0x0A && index2 == 0x01))
return FALSE;
return TRUE;
}
return FALSE;
}
return first;
}
static void
maxq_print_arg (MAX_ARG_TYPE arg,
struct disassemble_info * info,
group_info grp)
{
switch (arg)
{
case FLAG_C:
info->fprintf_func (info->stream, "C");
break;
case FLAG_NC:
info->fprintf_func (info->stream, "NC");
break;
case FLAG_Z:
info->fprintf_func (info->stream, "Z");
break;
case FLAG_NZ:
info->fprintf_func (info->stream, "NZ");
break;
case FLAG_S:
info->fprintf_func (info->stream, "S");
break;
case FLAG_E:
info->fprintf_func (info->stream, "E");
break;
case FLAG_NE:
info->fprintf_func (info->stream, "NE");
break;
case ACC_BIT:
info->fprintf_func (info->stream, "Acc");
if ((grp.flag & BIT_NO) == BIT_NO)
info->fprintf_func (info->stream, ".%d", grp.bit_no);
break;
case A_BIT_0:
info->fprintf_func (info->stream, "#0");
break;
case A_BIT_1:
info->fprintf_func (info->stream, "#1");
break;
default:
break;
}
}
static unsigned char
get_group (const unsigned int insn)
{
if (check_move ((insn >> 8), (insn & _DECODE_LOWBYTE)))
return 8;
if ((insn & _DECODE_LOWNIB_HIGHBYTE) == 0x0A00)
{
/* && condition with sec part added on 26 May for resolving 2 & 3 grp
conflict. */
if (((insn & _DECODE_LOWNIB_LOWBYTE) == 0x000A)
&& ((insn & _DECODE_GET_F_HIGHBYTE) == 0x8000))
{
if ((insn & _DECODE_HIGHNIB_HIGHBYTE) == 0x8000)
return 2;
else
return 3;
}
return 1;
}
else if ((insn & _DECODE_LOWNIB_HIGHBYTE) == 0x0C00)
{
if (((insn & _DECODE_LOWBYTE) == 0x000D) && JUMP_CHECK (insn)
&& ((insn & _DECODE_GET_F_HIGHBYTE) == 0x8000))
return 6;
else if ((insn & _DECODE_LOWBYTE) == 0x008D)
return 7;
return 5;
}
else if (((insn & _DECODE_LOWNIB_HIGHBYTE) == 0x0D00)
&& (((insn & _DECODE_4TO6_HIGHBYTE) == 0x3000)
|| ((insn & _DECODE_4TO6_HIGHBYTE) == 0x4000)
|| ((insn & _DECODE_4TO6_HIGHBYTE) == 0x5000)
|| ((insn & _DECODE_4TO6_HIGHBYTE) == 0x0000)))
return 10;
else if ((insn & _DECODE_LOWBYTE) == 0x000D)
return 11;
else if ((insn & _DECODE_LOWBYTE) == 0x008D)
return 12;
else if ((insn & _DECODE_0TO6_HIGHBYTE) == 0x7800)
return 13;
else if ((insn & _DECODE_LOWNIB_HIGHBYTE) == 0x0700)
return 9;
else if (((insn & _DECODE_LOWNIB_LOWBYTE) == 0x0007)
&& ((insn & _DECODE_GET_F_HIGHBYTE) == 0x8000))
return 4;
return 8;
}
static void
get_insn_opcode (const unsigned int insn, group_info *i)
{
static unsigned char pfx_flag = 0;
static unsigned char count_for_pfx = 0;
i->flag ^= i->flag;
i->bit_no ^= i->bit_no;
i->dst ^= i->dst;
i->fbit ^= i->fbit;
i->group_no ^= i->group_no;
i->src ^= i->src;
i->sub_opcode ^= i->sub_opcode;
if (count_for_pfx > 0)
count_for_pfx++;
if (((insn >> 8) == 0x0b) || ((insn >> 8) == 0x2b))
{
pfx_flag = 1;
count_for_pfx = 1;
}
i->group_no = get_group (insn);
if (pfx_flag && (i->group_no == 0x0D) && (count_for_pfx == 2)
&& ((insn & _DECODE_0TO6_HIGHBYTE) == 0x7800))
{
i->group_no = 0x08;
count_for_pfx = 0;
pfx_flag ^= pfx_flag;
}
switch (i->group_no)
{
case 1:
i->sub_opcode = ((insn & _DECODE_4TO6_HIGHBYTE) >> 12);
i->flag |= SUB_OP;
i->src = ((insn & _DECODE_LOWBYTE));
i->flag |= SRC;
i->fbit = ((insn & _DECODE_GET_F_HIGHBYTE) >> 15);
i->flag |= FORMAT;
break;
case 2:
i->sub_opcode = ((insn & _DECODE_HIGHNIB_LOWBYTE) >> 4);
i->flag |= SUB_OP;
break;
case 3:
i->sub_opcode = ((insn & _DECODE_HIGHNIB_HIGHBYTE) >> 12);
i->flag |= SUB_OP;
i->bit_no = ((insn & _DECODE_HIGHNIB_LOWBYTE) >> 4);
i->flag |= BIT_NO;
break;
case 4:
i->sub_opcode = ((insn & _DECODE_BIT7_LOWBYTE) >> 7);
i->flag |= SUB_OP;
i->dst = ((insn & _DECODE_0TO6_HIGHBYTE) >> 8);
i->flag |= DST;
i->bit_no = ((insn & _DECODE_4TO6_LOWBYTE) >> 4);
i->flag |= BIT_NO;
break;
case 5:
i->sub_opcode = ((insn & _DECODE_4TO6_HIGHBYTE) >> 12);
i->flag |= SUB_OP;
i->src = ((insn & _DECODE_LOWBYTE));
i->flag |= SRC;
i->fbit = ((insn & _DECODE_GET_F_HIGHBYTE) >> 15);
i->flag |= FORMAT;
break;
case 6:
i->sub_opcode = ((insn & _DECODE_HIGHNIB_HIGHBYTE) >> 12);
i->flag |= SUB_OP;
break;
case 7:
i->sub_opcode = ((insn & _DECODE_HIGHNIB_HIGHBYTE) >> 12);
i->flag |= SUB_OP;
break;
case 8:
i->dst = ((insn & _DECODE_0TO6_HIGHBYTE) >> 8);
i->flag |= DST;
i->src = ((insn & _DECODE_LOWBYTE));
i->flag |= SRC;
i->fbit = ((insn & _DECODE_GET_F_HIGHBYTE) >> 15);
i->flag |= FORMAT;
break;
case 9:
i->sub_opcode = ((insn & _DECODE_0TO2_HIGHBYTE) >> 8);
i->flag |= SUB_OP;
i->bit_no = ((insn & _DECODE_4TO6_HIGHBYTE) >> 12);
i->flag |= BIT_NO;
i->fbit = ((insn & _DECODE_GET_F_HIGHBYTE) >> 15);
i->flag |= FORMAT;
i->src = ((insn & _DECODE_LOWBYTE));
i->flag |= SRC;
break;
case 10:
i->sub_opcode = ((insn & _DECODE_4TO6_HIGHBYTE) >> 12);
i->flag |= SUB_OP;
i->src = ((insn & _DECODE_LOWBYTE));
i->flag |= SRC;
i->fbit = ((insn & _DECODE_GET_F_HIGHBYTE) >> 15);
i->flag |= FORMAT;
break;
case 11:
i->dst = ((insn & _DECODE_0TO6_HIGHBYTE) >> 8);
i->flag |= DST;
break;
case 12:
i->dst = ((insn & _DECODE_0TO6_HIGHBYTE) >> 8);
i->flag |= DST;
break;
case 13:
i->sub_opcode = ((insn & _DECODE_4TO6_HIGHBYTE) >> 12);
i->flag |= SUB_OP;
i->src = ((insn & _DECODE_LOWBYTE));
i->flag |= SRC;
i->fbit = ((insn & _DECODE_GET_F_HIGHBYTE) >> 15);
i->flag |= FORMAT;
break;
}
return;
}
/* Print one instruction from MEMADDR on INFO->STREAM. Return the size of the
instruction (always 2 on MAXQ20). */
static int
print_insn (bfd_vma memaddr, struct disassemble_info *info,
enum bfd_endian endianess)
{
/* The raw instruction. */
unsigned char insn[2], insn0, insn8, derived_code;
unsigned int format;
unsigned int actual_operands;
unsigned int i;
/* The group_info collected/decoded. */
group_info grp;
MAXQ20_OPCODE_INFO const *opcode;
int status;
format = 0;
status = info->read_memory_func (memaddr, (bfd_byte *) & insn[0], 2, info);
if (status != 0)
{
info->memory_error_func (status, memaddr, info);
return -1;
}
insn8 = insn[1];
insn0 = insn[0];
/* FIXME: Endianness always little. */
if (endianess == BFD_ENDIAN_BIG)
get_insn_opcode (((insn[0] << 8) | (insn[1])), &grp);
else
get_insn_opcode (((insn[1] << 8) | (insn[0])), &grp);
derived_code = ((grp.group_no << 4) | grp.sub_opcode);
if (insn[0] == 0 && insn[1] == 0)
{
info->fprintf_func (info->stream, "00 00");
return 2;
}
/* The opcode is always in insn0. */
for (opcode = &op_table[0]; opcode->name != NULL; ++opcode)
{
if (opcode->instr_id == derived_code)
{
if (opcode->instr_id == 0x3D)
{
if ((grp.bit_no == 0) && (opcode->arg[1] != A_BIT_0))
continue;
if ((grp.bit_no == 1) && (opcode->arg[1] != A_BIT_1))
continue;
if ((grp.bit_no == 3) && (opcode->arg[0] != 0))
continue;
}
info->fprintf_func (info->stream, "%s ", opcode->name);
actual_operands = 0;
if ((grp.flag & SRC) == SRC)
actual_operands++;
if ((grp.flag & DST) == DST)
actual_operands++;
/* If Implict FLAG in the Instruction. */
if ((opcode->op_number > actual_operands)
&& !((grp.flag & SRC) == SRC) && !((grp.flag & DST) == DST))
{
for (i = 0; i < opcode->op_number; i++)
{
if (i == 1 && (opcode->arg[1] != NO_ARG))
info->fprintf_func (info->stream, ",");
maxq_print_arg (opcode->arg[i], info, grp);
}
}
/* DST is ABSENT in the grp. */
if ((opcode->op_number > actual_operands)
&& ((grp.flag & SRC) == SRC))
{
maxq_print_arg (opcode->arg[0], info, grp);
info->fprintf_func (info->stream, " ");
if (opcode->instr_id == 0xA4)
info->fprintf_func (info->stream, "LC[0]");
if (opcode->instr_id == 0xA5)
info->fprintf_func (info->stream, "LC[1]");
if ((grp.flag & SRC) == SRC)
info->fprintf_func (info->stream, ",");
}
if ((grp.flag & DST) == DST)
{
if ((grp.flag & BIT_NO) == BIT_NO)
{
info->fprintf_func (info->stream, " %s.%d",
get_reg_name (grp.dst,
(type1) 0 /*DST*/),
grp.bit_no);
}
else
info->fprintf_func (info->stream, " %s",
get_reg_name (grp.dst, (type1) 0));
}
/* SRC is ABSENT in the grp. */
if ((opcode->op_number > actual_operands)
&& ((grp.flag & DST) == DST))
{
info->fprintf_func (info->stream, ",");
maxq_print_arg (opcode->arg[1], info, grp);
info->fprintf_func (info->stream, " ");
}
if ((grp.flag & SRC) == SRC)
{
if ((grp.flag & DST) == DST)
info->fprintf_func (info->stream, ",");
if ((grp.flag & BIT_NO) == BIT_NO)
{
format = opcode->format;
if ((grp.flag & FORMAT) == FORMAT)
format = grp.fbit;
if (format == 1)
info->fprintf_func (info->stream, " %s.%d",
get_reg_name (grp.src,
(type1) 1 /*SRC*/),
grp.bit_no);
if (format == 0)
info->fprintf_func (info->stream, " #%02xh.%d",
grp.src, grp.bit_no);
}
else
{
format = opcode->format;
if ((grp.flag & FORMAT) == FORMAT)
format = grp.fbit;
if (format == 1)
info->fprintf_func (info->stream, " %s",
get_reg_name (grp.src,
(type1) 1 /*SRC*/));
if (format == 0)
info->fprintf_func (info->stream, " #%02xh",
(grp.src));
}
}
return 2;
}
}
info->fprintf_func (info->stream, "Unable to Decode : %02x %02x",
insn[0], insn[1]);
return 2;
}
int
print_insn_maxq_little (bfd_vma memaddr, struct disassemble_info *info)
{
return print_insn (memaddr, info, BFD_ENDIAN_LITTLE);
}
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