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Handle division by zero instead of crashing

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jn 2023-01-27 01:40:12 +01:00
parent 1d9de64e5f
commit 6ddf60fba6
1 changed files with 26 additions and 12 deletions
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38
src/cpu.c
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@ -861,6 +861,20 @@ static void vm_skipparam(vm_t *vm, uint32_t size, uint8_t prtype) {
break; \
}
#define VM_IMPL_DIV(_size, _type, _type_target, _vm_source, _vm_source_stay, _vm_target, _oper) { \
VM_PRELUDE_2(_size); \
_type a = (_type) _vm_source(vm, instr.source); \
_type b = (_type) _vm_source_stay(vm, instr.target); \
if (a == 0) { \
vm_panic(vm, FOX32_ERR_DIVZERO); \
break; \
} \
_type x = _oper(b, a); \
vm->flag_zero = x == 0; \
_vm_target(vm, instr.target, (_type_target) x); \
break; \
}
#define VM_IMPL_CMP(_size, _type, _vm_source) { \
VM_PRELUDE_0(); \
_type a = _vm_source(vm, instr.source); \
@ -1020,18 +1034,18 @@ static void vm_execute(vm_t *vm) {
case OP(SZ_HALF, OP_IMUL): VM_IMPL_ADD(SIZE16, int16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, CHECKED_MUL);
case OP(SZ_WORD, OP_IMUL): VM_IMPL_ADD(SIZE32, int32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, CHECKED_MUL);
case OP(SZ_BYTE, OP_DIV): VM_IMPL_AND(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_DIV);
case OP(SZ_HALF, OP_DIV): VM_IMPL_AND(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_DIV);
case OP(SZ_WORD, OP_DIV): VM_IMPL_AND(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_DIV);
case OP(SZ_BYTE, OP_REM): VM_IMPL_AND(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_REM);
case OP(SZ_HALF, OP_REM): VM_IMPL_AND(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_REM);
case OP(SZ_WORD, OP_REM): VM_IMPL_AND(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_REM);
case OP(SZ_BYTE, OP_IDIV): VM_IMPL_AND(SIZE8, int8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_DIV);
case OP(SZ_HALF, OP_IDIV): VM_IMPL_AND(SIZE16, int16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_DIV);
case OP(SZ_WORD, OP_IDIV): VM_IMPL_AND(SIZE32, int32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_DIV);
case OP(SZ_BYTE, OP_IREM): VM_IMPL_AND(SIZE8, int8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_REM);
case OP(SZ_HALF, OP_IREM): VM_IMPL_AND(SIZE16, int16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_REM);
case OP(SZ_WORD, OP_IREM): VM_IMPL_AND(SIZE32, int32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_REM);
case OP(SZ_BYTE, OP_DIV): VM_IMPL_DIV(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_DIV);
case OP(SZ_HALF, OP_DIV): VM_IMPL_DIV(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_DIV);
case OP(SZ_WORD, OP_DIV): VM_IMPL_DIV(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_DIV);
case OP(SZ_BYTE, OP_REM): VM_IMPL_DIV(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_REM);
case OP(SZ_HALF, OP_REM): VM_IMPL_DIV(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_REM);
case OP(SZ_WORD, OP_REM): VM_IMPL_DIV(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_REM);
case OP(SZ_BYTE, OP_IDIV): VM_IMPL_DIV(SIZE8, int8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_DIV);
case OP(SZ_HALF, OP_IDIV): VM_IMPL_DIV(SIZE16, int16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_DIV);
case OP(SZ_WORD, OP_IDIV): VM_IMPL_DIV(SIZE32, int32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_DIV);
case OP(SZ_BYTE, OP_IREM): VM_IMPL_DIV(SIZE8, int8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_REM);
case OP(SZ_HALF, OP_IREM): VM_IMPL_DIV(SIZE16, int16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_REM);
case OP(SZ_WORD, OP_IREM): VM_IMPL_DIV(SIZE32, int32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_REM);
case OP(SZ_BYTE, OP_AND): VM_IMPL_AND(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_AND);
case OP(SZ_HALF, OP_AND): VM_IMPL_AND(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_AND);