arithmetic.h

来自「简单的虚拟机」· C头文件 代码 · 共 128 行

/* opcode r/m8 r8| op r8 r/m8 */
#define handle_arith_rm8(opstr, op1,op2) \
{\
	word __dest = get_op_val(op1); \
	word __src = get_op_val(op2); \
	__asm__("push %%edx\n\t" \
		 "popfl \n\t" \
		 #opstr" %%bl,%%al\n\t" \
		 "pushfl \n\t" \
		 "pop %%edx\n\t" \
		 :"=a"(__dest),"=d"(cpu.flags) \
		 :"a"(__dest),"b"(__src),"d"(cpu.flags)); \
	set_op_val(op1,__dest); \
}

/* opcode r/m16 r16 | op r16 r/m16 */
#define handle_arith_rm16(opstr,op1,op2) \
{ \
	word __dest = get_op_val(op1); \
	word __src = get_op_val(op2); \
	__asm__("push %%edx\n\t" \
		 "popfl\n\t" \
		 #opstr" %%bx,%%ax\n\t" \
		 "pushfl\n\t" \
		 "pop %%edx\n\t" \
		 :"=a"(__dest),"=d"(cpu.flags) \
		 :"a"(__dest),"b"(__src),"d"(cpu.flags)); \
	set_op_val(op1,__dest); \
}

#define handle_arith_rm(opstr,op1,op2,wFlag) \
	if(wFlag) \
	{ \
		handle_arith_rm16(opstr,op1,op2) \
	} \
	else \
	{ \
		handle_arith_rm8(opstr,op1,op2) \
	}
/****************************************************************************/
/* opcode r/m8 imm8 */
#define handle_arith_rm8_imm(opstr, op, imm) \
{ \
	word __dest = get_op_val(op); \
	__asm__("push %%edx\n\t" \
		 "popfl\n\t" \
		 #opstr" %%bl,%%al\n\t" \
		 "pushfl\n\t" \
		 "pop %%edx\n\t" \
		 :"=a"(__dest),"=d"(cpu.flags) \
		 :"a"(__dest),"d"(cpu.flags),"b"(imm)); \
	set_op_val(op,__dest); \
}

/* opcode r/m16 imm16 */
#define handle_arith_rm16_imm(opstr,op,imm) \
{ \
	word __dest = get_op_val(op); \
	__asm__("push %%edx\n\t" \
		 "popfl\n\t" \
		 #opstr" %%bx,%%ax\n\t" \
		 "pushfl\n\t" \
		 "pop %%edx\n\t" \
		 :"=a"(__dest),"=d"(cpu.flags) \
		 :"a"(__dest),"d"(cpu.flags),"b"(imm)); \
	set_op_val(op,__dest); \
}

#define handle_arith_rm_imm(opstr,op,imm,wFlag) \
	if(wFlag) \
	{ \
		handle_arith_rm16_imm(opstr,op,imm) \
	} \
	else \
	{ \
		handle_arith_rm8_imm(opstr,op,imm) \
	}

/****************************************************************************/
#define handle_bcdadjust(opstr) \
{ \
	__asm__("push %%edx\n\t" \
		 "popfl\n\t" \
		 #opstr"\n\t" \
		 "pushfl\n\t" \
		 "pop %%edx\n\t" \
		 :"=d"(cpu.flags),"=a"(cpu.greg.ax) \
		 :"d"(cpu.flags),"a"(cpu.greg.ax)); \
}

/*****************************************************************************/
#define handle_incdec16(opstr,op) \
{ \
	word __dest = get_op_val(op); \
	__asm__("push %%edx\n\t" \
		 "popfl\n\t" \
		 #opstr" %%ax\n\t" \
		 "pushfl\n\t" \
		 "pop %%edx\n\t" \
		 :"=a"(__dest),"=d"(cpu.flags) \
		 :"a"(__dest),"d"(cpu.flags)); \
	set_op_val(op,__dest); \
}

#define handle_incdec8(opstr,op) \
{ \
	word __dest = get_op_val(op); \
	__asm__("push %%edx\n\t" \
		 "popfl\n\t" \
		 #opstr" %%al\n\t" \
		 "pushfl\n\t" \
		 "pop %%edx\n\t" \
		 :"=a"(__dest),"=d"(cpu.flags) \
		 :"a"(__dest),"d"(cpu.flags)); \
	set_op_val(op,__dest); \
}

#define handle_incdec(opstr,op,wFlag) \
	if(wFlag) \
	{ \
		handle_incdec16(opstr,op) \
	} \
	else \
	{ \
		handle_incdec8(opstr,op) \
	}