cpu_8080.h File Reference

This file simulates and disassembles part of 8080 processor. More...

#include <inttypes.h>
#include "memory_8080.h"

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Classes
struct	program_status_word
	program_status_word: An exdended PSW for easy checks and sets of PSW without flagging. More...
struct	cpu_state
	cpu_state: This structure keeps runtime state of all the registers in the CPU. More...

Macros
#define	UNUSED   __attribute__((unused))
#define	ALL_BUT_AUX_FLAG   (SIGN_FLAG | ZERO_FLAG | PARITY_FLAG | CARRY_FLAG)
	All but the aux flag options.

Enumerations
enum	flag_bits {   SIGN_FLAG = 1 << 0 , ZERO_FLAG = 1 << 1 , AUX_FLAG = 1 << 3 , PARITY_FLAG = 1 << 5 ,   CARRY_FLAG = 1 << 7 }
	ENUMS for PSW_FLAGS.
enum	condition_flags {   NZ_check = 0x0 , Z_check = 0x1 , NC_check = 0x2 , C_check = 0x3 ,   PO_check = 0x4 , PE_check = 0x5 , P_check = 0x6 , M_check = 0x7 }
	different condition checks for JMP, conditional OPS More...

Functions
cpu_state *	init_cpu_8080 (uint16_t pc, uint8_t(*in_cb)(uint8_t), void(*out_cb)(uint8_t, uint8_t))
	Initialize a new cpu_8080 instance structure. Everything is initialized to 0. More...
int	exec_inst (cpu_state *cpu)
	Executes the instruction pc is pointing to after incrementing it. More...
int	decompile_inst (cpu_state *cpu, uint16_t *next_inst)
	Recompile mode. More...
void	io_machine_OUT (uint8_t port, uint8_t data)
	Function to write data to the IO port. More...
uint8_t	io_machine_IN (uint8_t port)
	Function to read a byte of data from the port. More...
void	print_state (const cpu_state cpu)
	Print the state of CPU. More...

Detailed Description

This file simulates and disassembles part of 8080 processor.

Author

Pranay Garg (prana.nosp@m.yga@.nosp@m.andre.nosp@m.w.cm.nosp@m.u.edu)

Version

0.1

Date

2020-12-20

Macro Definition Documentation

UNUSED

#define UNUSED   __attribute__((unused))

GCC header for unused variables Werror bypass

Enumeration Type Documentation

condition_flags

enum condition_flags

different condition checks for JMP, conditional OPS

Enumerator
NZ_check	not zero (Z = 0)
Z_check	zero (2 = 1)
NC_check	no carry (CY = 0)
C_check	carry (CY = 1)
PO_check	parity odd (P = 0)
PE_check	parity even (P = 1)
P_check	plus (Sign = 0)
M_check	minus(Sign = 1)

Function Documentation

decompile_inst()

int decompile_inst	(	cpu_state *	cpu,
		uint16_t *	next_inst
	)

Recompile mode.

Parameters

cpu
next_inst

Returns

int

exec_inst()

int exec_inst

(

cpu_state *

cpu

)

Executes the instruction pc is pointing to after incrementing it.

Parameters

cpu

Returns

int

init_cpu_8080()

cpu_state* init_cpu_8080	(	uint16_t	pc,
		uint8_t(*)(uint8_t)	in_cb,
		void(*)(uint8_t, uint8_t)	out_cb
	)

Initialize a new cpu_8080 instance structure. Everything is initialized to 0.

Parameters

pc	Program counter initialization
in_cb
out_cb

Returns

cpu_state* Pointer to the Malloced CPU state.

Note

• the user is responsible for freeing the memory (for the CPU) once it's done
• expects base to be initialized by the user to a 64KB aligned memory

Returns

cpu_state*

io_machine_IN()

uint8_t io_machine_IN

(

uint8_t

port

)

Function to read a byte of data from the port.

Parameters

port	from which the data is read

Returns

uint8_t

io_machine_OUT()

void io_machine_OUT	(	uint8_t	port,
		uint8_t	data
	)

Function to write data to the IO port.

Parameters

port	where the data is written to
data	which is written

print_state()

void print_state

(

const cpu_state

cpu

)

Print the state of CPU.

Parameters

cpu