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CAR: added stack operations, call, ret, jmp and some other random stuff

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This commit is contained in:
David Goeke
2026-07-18 19:28:11 -05:00
parent 5902eae153
commit 1f11242762
10 changed files with 294 additions and 20 deletions
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67
include/defs.h
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@ -5,7 +5,8 @@
#include <stddef.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
//#define _DEBUG
@ -27,6 +28,22 @@ int processor_start(pstate_t* state);
void dump_regs(pstate_t* s);
void _push(uint32_t v, pstate_t* state);
void _pop(uint32_t* a, pstate_t* state);
// returns !error (true on no error, false on error) { true on safe address, false on invalid address }
static inline bool check_addr(uint32_t addr, pstate_t* state)
{
if (addr < state->memory_size)
{
return true;
}
fprintf(stderr, "[ERROR]: memory address out of range: address 0x%x with memory size 0x%x\n", addr, (uint32_t) state->memory_size);
return false;
}
#define FLAG_CARRY (1 << 0)
#define FLAG_SIGN (1 << 1)
#define FLAG_OVERFLOW (1 << 2)
@ -116,21 +133,31 @@ typedef struct
pstate_t* state)
static const op_return_t _OP_RETV_NORMAL = { .do_inc_pc = true, .exiting_error = false };
static const op_return_t _OP_RETV_EXITING_ERROR = { .do_inc_pc = true, .exiting_error = true };
static const op_return_t _OP_RETV_EXITING_ERROR = { .do_inc_pc = true, .exiting_error = true };
static const op_return_t _OP_RETV_NO_INC_PC = { .do_inc_pc = false, .exiting_error = false };
#define OP_RETURN_NORMAL return _OP_RETV_NORMAL;
#define OP_RETURN_NO_INC_PC return _OP_RETV_NO_INC_PC;
#define OP_RETURN_EXITING_ERROR return _OP_RETV_EXITING_ERROR;
typedef op_return_t (*op)(raw_instruction_t*, pstate_t*);
static DEFINE_OP(nop)
{
OP_RETURN_NORMAL
}
DEFINE_OP(nop);
DEFINE_OP(call);
DEFINE_OP(ret);
DEFINE_OP(jmp);
static const op misc_ops[] =
{
op_nop,
op_call,
op_ret,
op_jmp,
op_jb,
};
static const size_t NUM_MISC_OPCODES = sizeof(misc_ops) / sizeof(misc_ops[0]);
@ -152,6 +179,12 @@ DEFINE_OP(bnot);
DEFINE_OP(xchg);
DEFINE_OP(fp_add);
DEFINE_OP(fp_sub);
DEFINE_OP(fp_mul);
DEFINE_OP(fp_div);
DEFINE_OP(fp_mod);
static const op reg_ops[] =
{
op_add,
@ -171,6 +204,12 @@ static const op reg_ops[] =
op_bnot,
op_xchg,
op_fp_add,
op_fp_sub,
op_fp_mul,
op_fp_div,
op_fp_mod,
};
static const size_t NUM_REG_OPCODES = sizeof(reg_ops) / sizeof(reg_ops[0]);
@ -188,6 +227,13 @@ DEFINE_OP(ldh);
DEFINE_OP(sti);
DEFINE_OP(stj);
DEFINE_OP(push);
DEFINE_OP(pushi); // push immediate
DEFINE_OP(pop);
DEFINE_OP(sth);
DEFINE_OP(stk);
static const op ls_ops[] =
{
op_ldr,
@ -203,6 +249,15 @@ static const op ls_ops[] =
op_sti,
op_stj,
op_push,
op_pushi,
op_pop,
op_sth, // store high 11 bits of immediate at address with base of pc
op_stk, // store high 11 bits of immediate at address with base of sp
// 1 more
};
static const size_t NUM_LS_OPCODES = sizeof(ls_ops) / sizeof(ls_ops[0]);