diff options
| -rw-r--r-- | src/runtime.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/src/runtime.c b/src/runtime.c index 2d3f1e8..1108b25 100644 --- a/src/runtime.c +++ b/src/runtime.c @@ -443,7 +443,11 @@ err_t vm_mov_byte(vm_t *vm, byte reg) if (err) return err; word *reg_ptr = &vm->registers.reg[reg / 8]; - *reg_ptr = (*reg_ptr) | (ret.as_word << ((reg % 8) * 8)); + size_t shift = (reg % 8) * 8; + // This resets the bits in the specific byte register + *reg_ptr = *reg_ptr & ~(0xFF << shift); + // This sets the bits + *reg_ptr = (*reg_ptr) | (ret.as_word << shift); return ERR_OK; } @@ -458,7 +462,11 @@ err_t vm_mov_hword(vm_t *vm, byte reg) if (err) return err; word *reg_ptr = &vm->registers.reg[reg / 2]; - *reg_ptr = (*reg_ptr) | (ret.as_word << ((reg % 2) * 2)); + size_t shift = (reg % 2) * 2; + // This resets the bits in the specific hword register + *reg_ptr = *reg_ptr & ~(0xFFFFFFFF << shift); + // This sets the bits + *reg_ptr = (*reg_ptr) | (ret.as_word << shift); return ERR_OK; } |