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master
Forest Belton 1 year ago
commit
26e739abe7
6 changed files with 111 additions and 0 deletions
  1. +2
    -0
      .gitignore
  2. +15
    -0
      Makefile
  3. +15
    -0
      include/cpu.h
  4. +61
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      include/insn.h
  5. +17
    -0
      src/cpu.c
  6. +1
    -0
      src/main.c

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.gitignore View File

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psxc
*.o

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Makefile View File

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CFLAGS ?= -Wall -Wextra -Iinclude
CFILES := $(shell find src -type f -name '*.c')
OFILES := $(CFILES:%.c=%.o)
.PHONY: clean
psxc: $(OFILES)
$(CC) $(OFILES) -o $@
%.o: %.c
$(CC) $(CFLAGS) -c $< -o $@
clean:
rm -f $(OFILES) psxc

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include/cpu.h View File

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#ifndef PSXC_H_
#define PSXC_H_
#include <stdint.h>
#define SP(cpu) ((cpu)->regs[29])
typedef struct {
uint32_t regs[32];
uint32_t pc;
} cpu_t;
typedef void (*cpu_insn_handler)(cpu_t *, uint32_t);
#endif

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include/insn.h View File

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#ifndef PSXC_INSN_H_
#define PSXC_INSN_H_
#include <stdint.h>
typedef enum {
SPECIAL = 0x00,
BCONDZ = 0x01,
J = 0x02,
JAL = 0x03,
BEQ = 0x04,
BNE = 0x05,
BLEZ = 0x06,
BGTZ = 0x07,
ADDI = 0x08,
ADDIU = 0x09,
SLTI = 0x0a,
SLTIU = 0x0b,
ANDI = 0x0c,
ORI = 0x0d,
XORI = 0x0e,
LUI = 0x0f,
COP0 = 0x10,
COP1 = 0x11,
COP2 = 0x12,
COP3 = 0x13,
LB = 0x20,
LH = 0x21,
LWL = 0x22,
LW = 0x23,
LBU = 0x24,
LHU = 0x25,
LWR = 0x26,
SB = 0x28,
SH = 0x29,
SWL = 0x2a,
SW = 0x2b,
SWR = 0x2e,
LWC0 = 0x30,
LWC1 = 0x31,
LWC2 = 0x32,
LWC3 = 0x33,
SWC0 = 0x38,
SWC1 = 0x39,
SWC2 = 0x3a,
SWC3 = 0x3b,
} op_primary_t;
static inline op_primary_t extract_primary_op(uint32_t insn) {
return (insn >> 26) & 0x3f;
}
typedef enum {
SLL = 0x00,
} op_secondary_t;
static inline op_secondary_t extract_secondary_op(uint32_t insn) {
return (insn >> 0) & 0x3f;
}
#endif

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src/cpu.c View File

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#include "cpu.h"
#include "insn.h"
static cpu_insn_handler primary_insn_handler[0x34] = {};
static cpu_insn_handler secondary_insn_handler[0x34] = {};
void cpu_execute_insn(cpu_t *cpu, uint32_t insn) {
const op_primary_t op = extract_primary_op(insn);
if (op == SPECIAL) {
const op_secondary_t op2 = extract_secondary_op(insn);
secondary_insn_handler[op2](cpu, insn);
return;
}
primary_insn_handler[op](cpu, insn);
}

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src/main.c View File

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int main() { return 0; }

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