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Implement the call instruction

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zoriya
2023-07-07 18:01:03 +09:00
parent 7f96fd2765
commit bb9ffebd4a
4 changed files with 17 additions and 8 deletions
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src/instructions.c
+4 -4
View File
@@ -162,7 +162,7 @@ const instruction_t instructions[] = {
{.opcode = 0x97, .extended = -1, .name = "xchg di, ax", .mode = {END}, .exec = NULL},
{.opcode = 0x98, .extended = -1, .name = "cbw", .mode = {END}, .exec = NULL},
{.opcode = 0x99, .extended = -1, .name = "cwd", .mode = {END}, .exec = NULL},
// {.opcode = 0x9A, .extended = -1, .name = "call", .mode = {CALL_INTER, END}, .exec = NULL},
// {.opcode = 0x9A, .extended = -1, .name = "call", .mode = {CALL_INTER, END}, .exec = &call},
{.opcode = 0x9B, .extended = -1, .name = "wait", .mode = {END}, .exec = NULL},
{.opcode = 0x9C, .extended = -1, .name = "pushf", .mode = {END}, .exec = &push},
{.opcode = 0x9D, .extended = -1, .name = "popf", .mode = {END}, .exec = NULL},
@@ -229,7 +229,7 @@ const instruction_t instructions[] = {
{.opcode = 0xE5, .extended = -1, .name = "in ax", .mode = {IMM8, END}, .exec = NULL},
{.opcode = 0xE6, .extended = -1, .name = "out %s, al", .mode = {IMM8, END}, .exec = NULL},
{.opcode = 0xE7, .extended = -1, .name = "out %s, ax", .mode = {IMM8, END}, .exec = NULL},
{.opcode = 0xE8, .extended = -1, .name = "call", .mode = {REL16, END}, .exec = NULL},
{.opcode = 0xE8, .extended = -1, .name = "call", .mode = {REL16, END}, .exec = &call},
{.opcode = 0xE9, .extended = -1, .name = "jmp", .mode = {REL16, END}, .exec = NULL},
// {.opcode = 0xEA, .extended = -1, .name = "jmp", .mode = {CALL_INTER, END}, .exec = NULL},
{.opcode = 0xEB, .extended = -1, .name = "jmp short", .mode = {REL8, END}, .exec = NULL},
@@ -326,8 +326,8 @@ const instruction_t extended[][8] = {
{
{.opcode = 0x00, .extended = -2, .name = "inc", .mode = {R_M16, END}, .exec = NULL},
{.opcode = 0x01, .extended = -2, .name = "dec", .mode = {R_M16, END}, .exec = NULL},
{.opcode = 0x02, .extended = -2, .name = "call", .mode = {R_M16, END}, .exec = NULL},
{.opcode = 0x03, .extended = -2, .name = "call", .mode = {R_M16, END}, .exec = NULL},
{.opcode = 0x02, .extended = -2, .name = "call", .mode = {R_M16, END}, .exec = &call},
{.opcode = 0x03, .extended = -2, .name = "call", .mode = {R_M16, END}, .exec = &call},
{.opcode = 0x04, .extended = -2, .name = "jmp", .mode = {R_M16, END}, .exec = NULL},
{.opcode = 0x05, .extended = -2, .name = "jmp", .mode = {R_M16, END}, .exec = NULL},
{.opcode = 0x06, .extended = -2, .name = "push", .mode = {R_M16, END}, .exec = &push},
src/instructions.h
+1
View File
@@ -5,5 +5,6 @@
void mov(const instruction_t *self, state_t *state);
void push(const instruction_t *self, state_t *state);
void call(const instruction_t *self, state_t *state);
void int_inst(const instruction_t *self, state_t *state);
void sub(const instruction_t *self, state_t *state);
src/instructions/memory.c
+9
View File
@@ -26,6 +26,15 @@ void push(const instruction_t *self, state_t *state)
state->memory[state->sp--] = what & 0xFF;
}
void call(const instruction_t *self, state_t *state)
{
uint16_t pc = *(uint16_t *)get_operand(self, 0, state);
state->memory[state->sp--] = state->pc >> 8;
state->memory[state->sp--] = state->pc & 0xFF;
state->pc = pc - get_inst_size(*self, state->binary + state->pc, state->binary_size - state->pc);
}
void int_inst(const instruction_t *self, state_t *state)
{
// I have no clue what the use of type is.
src/interpretor.c
+3 -4
View File
@@ -189,20 +189,19 @@ int interpret(u_int8_t *binary, unsigned long size)
printf(" AX BX CX DX SP BP SI DI FLAGS IP\n");
while (state->pc < size) {
instruction_t inst = parse_inst(binary, size - state->pc);
unsigned inst_size = get_inst_size(inst, binary, size - state->pc);
instruction_t inst = parse_inst(state->binary + state->pc, size - state->pc);
unsigned inst_size = get_inst_size(inst, state->binary + state->pc, size - state->pc);
if (state->pc + inst_size > size) {
return 0;
}
print_state(state);
print_instruction(state->pc, inst, inst_size, binary, false);
print_instruction(state->pc, inst, inst_size, state->binary + state->pc, false);
state->parse_data.imm_idx = 1 + (inst.extended != -1 || has_reg(&inst));
if (inst.exec)
inst.exec(&inst, state);
else
printf("Not implemented.\n");
state->pc += inst_size;
binary += inst_size;
}
return 0;
}