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disasm.c
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disasm.c
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/* 8051 emulator core
* Copyright 2006 Jari Komppa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject
* to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* (i.e. the MIT License)
*
* disasm.c
* Disassembler functions
*
* These functions decode 8051 operations into text strings, useful in
* interactive debugger.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "emu8051.h"
#define CODEMEM(x) aCPU->mCodeMem[(x)&(aCPU->mCodeMemMaxIdx)]
#define OPCODE CODEMEM(aPosition + 0)
#define OPERAND1 CODEMEM(aPosition + 1)
#define OPERAND2 CODEMEM(aPosition + 2)
//#define static
void mem_memonic(int aValue, char *aBuffer)
{
int done = 0;
if (aValue > 0x7f)
{
switch (aValue - 0x80)
{
case REG_ACC:
strcpy(aBuffer, "ACC");
done = 1;
break;
case REG_B:
strcpy(aBuffer, "B");
done = 1;
break;
case REG_PSW:
strcpy(aBuffer, "PSW");
done = 1;
break;
case REG_SP:
strcpy(aBuffer, "SP");
done = 1;
break;
case REG_DPL:
strcpy(aBuffer, "DPL");
done = 1;
break;
case REG_DPH:
strcpy(aBuffer, "DPH");
done = 1;
break;
case REG_P0:
strcpy(aBuffer, "P0");
done = 1;
break;
case REG_P1:
strcpy(aBuffer, "P1");
done = 1;
break;
case REG_P2:
strcpy(aBuffer, "P2");
done = 1;
break;
case REG_P3:
strcpy(aBuffer, "P3");
done = 1;
break;
case REG_IP:
strcpy(aBuffer, "IP");
done = 1;
break;
case REG_IE:
strcpy(aBuffer, "IE");
done = 1;
break;
case REG_TMOD:
strcpy(aBuffer, "TMOD");
done = 1;
break;
case REG_TCON:
strcpy(aBuffer, "TCON");
done = 1;
break;
case REG_TH0:
strcpy(aBuffer, "TH0");
done = 1;
break;
case REG_TL0:
strcpy(aBuffer, "TL0");
done = 1;
break;
case REG_TH1:
strcpy(aBuffer, "TH1");
done = 1;
break;
case REG_TL1:
strcpy(aBuffer, "TL1");
done = 1;
break;
case REG_SCON:
strcpy(aBuffer, "SCON");
done = 1;
break;
case REG_PCON:
strcpy(aBuffer, "PCON");
done = 1;
break;
case REG_SBUF:
strcpy(aBuffer, "SBUF");
done = 1;
break;
}
}
if (!done)
{
sprintf(aBuffer, "%02Xh", aValue);
}
}
void bitaddr_memonic(int aValue, char *aBuffer)
{
char regname[16];
if (aValue > 0x7f)
{
switch ((aValue & 0xf8) - 0x80)
{
case REG_ACC:
strcpy(regname, "ACC");
break;
case REG_B:
strcpy(regname, "B");
break;
case REG_PSW:
strcpy(regname, "PSW");
break;
case REG_SP:
strcpy(regname, "SP");
break;
case REG_DPL:
strcpy(regname, "DPL");
break;
case REG_DPH:
strcpy(regname, "DPH");
break;
case REG_P0:
strcpy(regname, "P0");
break;
case REG_P1:
strcpy(regname, "P1");
break;
case REG_P2:
strcpy(regname, "P2");
break;
case REG_P3:
strcpy(regname, "P3");
break;
case REG_IP:
strcpy(regname, "IP");
break;
case REG_IE:
strcpy(regname, "IE");
break;
case REG_TMOD:
strcpy(regname, "TMOD");
break;
case REG_TCON:
strcpy(regname, "TCON");
break;
case REG_TH0:
strcpy(regname, "TH0");
break;
case REG_TL0:
strcpy(regname, "TL0");
break;
case REG_TH1:
strcpy(regname, "TH1");
break;
case REG_TL1:
strcpy(regname, "TL1");
break;
case REG_SCON:
strcpy(regname, "SCON");
break;
case REG_PCON:
strcpy(regname, "PCON");
break;
default:
sprintf(regname, "%02Xh",(aValue & 0xF8));
break;
}
}
else
{
sprintf(regname, "%02Xh", aValue >> 3);
}
sprintf(aBuffer, "%s.%d", regname, aValue & 7);
}
static uint8_t disasm_ajmp_offset(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"AJMP #%04Xh",
((aPosition + 2) & 0xf800) |
OPERAND1 |
((OPCODE & 0xe0) << 3));
return 2;
}
static uint8_t disasm_ljmp_address(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"LJMP #%04Xh",
(OPERAND1 << 8) |
OPERAND2);
return 3;
}
static uint8_t disasm_rr_a(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"RR A");
return 1;
}
static uint8_t disasm_inc_a(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"INC A");
return 1;
}
static uint8_t disasm_inc_mem(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"INC %s",
mem);
return 2;
}
static uint8_t disasm_inc_indir_rx(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"INC @R%d",
OPCODE & 1);
return 1;
}
static uint8_t disasm_jbc_bitaddr_offset(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char baddr[16];
bitaddr_memonic(OPERAND1, baddr);
sprintf(aBuffer,"JBC %s, #%+d",
baddr,
(signed char)OPERAND2);
return 3;
}
static uint8_t disasm_acall_offset(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"ACALL %04Xh",
((aPosition + 2) & 0xf800) |
OPERAND1 |
((OPCODE & 0xe0) << 3));
return 2;
}
static uint8_t disasm_lcall_address(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"LCALL #%04Xh",
(OPERAND1 << 8) |
OPERAND2);
return 3;
}
static uint8_t disasm_rrc_a(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"RRC A");
return 1;
}
static uint8_t disasm_dec_a(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"DEC A");
return 1;
}
static uint8_t disasm_dec_mem(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"DEC %s",
mem);
return 2;
}
static uint8_t disasm_dec_indir_rx(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"DEC @R%d",
OPCODE & 1);
return 1;
}
static uint8_t disasm_jb_bitaddr_offset(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char baddr[16];
bitaddr_memonic(OPERAND1, baddr);
sprintf(aBuffer,"JB %s, #%+d",
baddr,
(signed char)OPERAND2);
return 3;
}
static uint8_t disasm_ret(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"RET");
return 1;
}
static uint8_t disasm_rl_a(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"RL A");
return 1;
}
static uint8_t disasm_add_a_imm(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"ADD A, #%02Xh",
OPERAND1);
return 2;
}
static uint8_t disasm_add_a_mem(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"ADD A, %s",
mem);
return 2;
}
static uint8_t disasm_add_a_indir_rx(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"ADD A, @R%d",
OPCODE&1);
return 1;
}
static uint8_t disasm_jnb_bitaddr_offset(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char baddr[16];
bitaddr_memonic(OPERAND1, baddr);
sprintf(aBuffer,"JNB %s, #%+d",
baddr,
(signed char)OPERAND2);
return 3;
}
static uint8_t disasm_reti(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"RETI");
return 1;
}
static uint8_t disasm_rlc_a(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"RLC A");
return 1;
}
static uint8_t disasm_addc_a_imm(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"ADDC A, #%02Xh",
OPERAND1);
return 2;
}
static uint8_t disasm_addc_a_mem(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"ADDC A, %s",
mem);
return 2;
}
static uint8_t disasm_addc_a_indir_rx(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"ADDC A, @R%d",
OPCODE&1);
return 1;
}
static uint8_t disasm_jc_offset(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"JC #%+d",
(signed char)OPERAND1);
return 2;
}
static uint8_t disasm_orl_mem_a(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"ORL %s, A",
mem);
return 2;
}
static uint8_t disasm_orl_mem_imm(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"ORL %s, #%02Xh",
mem,
OPERAND2);
return 3;
}
static uint8_t disasm_orl_a_imm(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"ORL A, #%02Xh",
OPERAND1);
return 2;
}
static uint8_t disasm_orl_a_mem(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"ORL A, %s",
mem);
return 2;
}
static uint8_t disasm_orl_a_indir_rx(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"ORL A, @R%d",
OPCODE&1);
return 1;
}
static uint8_t disasm_jnc_offset(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"JNC #%+d",
(signed char)OPERAND1);
return 2;
}
static uint8_t disasm_anl_mem_a(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"ANL %s, A",
mem);
return 2;
}
static uint8_t disasm_anl_mem_imm(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"ANL %s, #%02Xh",
mem,
OPERAND2);
return 3;
}
static uint8_t disasm_anl_a_imm(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"ANL A, #%02Xh",
OPERAND1);
return 2;
}
static uint8_t disasm_anl_a_mem(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"ANL A, %s",
mem);
return 2;
}
static uint8_t disasm_anl_a_indir_rx(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"ANL A, @R%d",
OPCODE&1);
return 1;
}
static uint8_t disasm_jz_offset(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"JZ #%+d",
(signed char)OPERAND1);
return 2;
}
static uint8_t disasm_xrl_mem_a(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"XRL %s, A",
mem);
return 2;
}
static uint8_t disasm_xrl_mem_imm(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"XRL %s, #%02Xh",
mem,
OPERAND2);
return 3;
}
static uint8_t disasm_xrl_a_imm(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"XRL A, #%02Xh",
OPERAND1);
return 2;
}
static uint8_t disasm_xrl_a_mem(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"XRL A, %s",
mem);
return 2;
}
static uint8_t disasm_xrl_a_indir_rx(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"XRL A, @R%d",
OPCODE&1);
return 1;
}
static uint8_t disasm_jnz_offset(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"JNZ #%+d",
(signed char)OPERAND1);
return 2;
}
static uint8_t disasm_orl_c_bitaddr(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char baddr[16];
bitaddr_memonic(OPERAND1, baddr);
sprintf(aBuffer,"ORL C, %s",
baddr);
return 2;
}
static uint8_t disasm_jmp_indir_a_dptr(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"JMP @A+DPTR");
return 1;
}
static uint8_t disasm_mov_a_imm(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"MOV A, #%02Xh",
OPERAND1);
return 2;
}
static uint8_t disasm_mov_mem_imm(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"MOV %s, #%02Xh",
mem,
OPERAND2);
return 3;
}
static uint8_t disasm_mov_indir_rx_imm(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"MOV @R%d, #%02Xh",
OPCODE&1,
OPERAND1);
return 2;
}
static uint8_t disasm_sjmp_offset(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"SJMP #%+d",
(signed char)(OPERAND1));
return 2;
}
static uint8_t disasm_anl_c_bitaddr(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char baddr[16];
bitaddr_memonic(OPERAND1, baddr);
sprintf(aBuffer,"ANL C, %s",
baddr);
return 2;
}
static uint8_t disasm_movc_a_indir_a_pc(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"MOVC A, @A+PC");
return 1;
}
static uint8_t disasm_div_ab(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"DIV AB");
return 1;
}
static uint8_t disasm_mov_mem_mem(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem1[16];
char mem2[16];
mem_memonic(OPERAND2, mem1);
mem_memonic(OPERAND1, mem2);
sprintf(aBuffer,"MOV %s, %s",
mem1,
mem2);
return 3;
}
static uint8_t disasm_mov_mem_indir_rx(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"MOV %s, @R%d",
mem,
OPCODE&1);
return 2;
}
static uint8_t disasm_mov_dptr_imm(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"MOV DPTR, #0%02X%02Xh",
OPERAND1,
OPERAND2);
return 3;
}
static uint8_t disasm_mov_bitaddr_c(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char baddr[16];
bitaddr_memonic(OPERAND1, baddr);
sprintf(aBuffer,"MOV %s, C",
baddr);
return 2;
}
static uint8_t disasm_movc_a_indir_a_dptr(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"MOVC A, @A+DPTR");
return 1;
}
static uint8_t disasm_subb_a_imm(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"SUBB A, #%02Xh",
OPERAND1);
return 2;
}
static uint8_t disasm_subb_a_mem(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"SUBB A, %s",
mem);
return 2;
}
static uint8_t disasm_subb_a_indir_rx(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"SUBB A, @R%d",
OPCODE&1);
return 1;
}
static uint8_t disasm_orl_c_compl_bitaddr(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char baddr[16];
bitaddr_memonic(OPERAND1, baddr);
sprintf(aBuffer,"ORL C, /%s",
baddr);
return 2;
}
static uint8_t disasm_mov_c_bitaddr(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char baddr[16];
bitaddr_memonic(OPERAND1, baddr);
sprintf(aBuffer,"MOV C, %s",
baddr);
return 2;
}
static uint8_t disasm_inc_dptr(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"INC DPTR");
return 1;
}
static uint8_t disasm_mul_ab(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"MUL AB");
return 1;
}
static uint8_t disasm_mov_indir_rx_mem(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"MOV @R%d, %s",
OPCODE&1,
mem);
return 2;
}
static uint8_t disasm_anl_c_compl_bitaddr(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char baddr[16];
bitaddr_memonic(OPERAND1, baddr);
sprintf(aBuffer,"ANL C, /%s",
baddr);
return 2;
}
static uint8_t disasm_cpl_bitaddr(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char baddr[16];
bitaddr_memonic(OPERAND1, baddr);
sprintf(aBuffer,"CPL %s",
baddr);
return 2;
}
static uint8_t disasm_cpl_c(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"CPL C");
return 1;
}
static uint8_t disasm_cjne_a_imm_offset(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"CJNE A, #%02Xh, #%+d",
OPERAND1,
(signed char)(OPERAND2));
return 3;
}
static uint8_t disasm_cjne_a_mem_offset(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"CJNE A, %s, #%+d",
mem,
(signed char)(OPERAND2));
return 3;
}
static uint8_t disasm_cjne_indir_rx_imm_offset(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"CJNE @R%d, #%02Xh, #%+d",
OPCODE&1,
OPERAND1,
(signed char)(OPERAND2));
return 3;
}
static uint8_t disasm_push_mem(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"PUSH %s",
mem);
return 2;
}
static uint8_t disasm_clr_bitaddr(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char baddr[16];
bitaddr_memonic(OPERAND1, baddr);
sprintf(aBuffer,"CLR %s",
baddr);
return 2;
}
static uint8_t disasm_clr_c(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"CLR C");
return 1;
}
static uint8_t disasm_swap_a(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"SWAP A");
return 1;
}
static uint8_t disasm_xch_a_mem(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"XCH A, %s",
mem);
return 2;
}
static uint8_t disasm_xch_a_indir_rx(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"XCH A, @R%d",
OPCODE&1);
return 1;
}
static uint8_t disasm_pop_mem(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"POP %s",
mem);
return 2;
}
static uint8_t disasm_setb_bitaddr(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char baddr[16];
bitaddr_memonic(OPERAND1, baddr);
sprintf(aBuffer,"SETB %s",
baddr);
return 2;
}
static uint8_t disasm_setb_c(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"SETB C");
return 1;
}
static uint8_t disasm_da_a(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"DA A");
return 1;
}
static uint8_t disasm_djnz_mem_offset(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"DJNZ %s, #%+d",
mem,
(signed char)(OPERAND2));
return 3;
}
static uint8_t disasm_xchd_a_indir_rx(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"XCHD A, @R%d",
OPCODE&1);
return 1;
}
static uint8_t disasm_movx_a_indir_dptr(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"MOVX A, @DPTR");
return 1;
}
static uint8_t disasm_movx_a_indir_rx(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"MOVX A, @R%d",
OPCODE&1);
return 1;
}
static uint8_t disasm_clr_a(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"CLR A");
return 1;
}
static uint8_t disasm_mov_a_mem(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"MOV A, %s",
mem);
return 2;
}
static uint8_t disasm_mov_a_indir_rx(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"MOV A, @R%d",
OPCODE&1);
return 1;
}
static uint8_t disasm_movx_indir_dptr_a(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"MOVX @DPTR, A");
return 1;
}
static uint8_t disasm_movx_indir_rx_a(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"MOVX @R%d, A",
OPCODE&1);
return 1;
}
static uint8_t disasm_cpl_a(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"CPL A");
return 1;
}
static uint8_t disasm_mov_mem_a(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
char mem[16];mem_memonic(OPERAND1, mem);
sprintf(aBuffer,"MOV %s, A",
mem);
return 2;
}
static uint8_t disasm_mov_indir_rx_a(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"MOV @R%d, A",
OPCODE&1);
return 1;
}
static uint8_t disasm_nop(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
if (OPCODE)
sprintf(aBuffer,"??UNKNOWN");
else
sprintf(aBuffer,"NOP");
return 1;
}
static uint8_t disasm_inc_rx(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"INC R%d",OPCODE&7);
return 1;
}
static uint8_t disasm_dec_rx(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"DEC R%d",OPCODE&7);
return 1;
}
static uint8_t disasm_add_a_rx(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{
sprintf(aBuffer,"ADD A, R%d",OPCODE&7);
return 1;
}
static uint8_t disasm_addc_a_rx(struct em8051 *aCPU, uint16_t aPosition, char *aBuffer)
{