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support negative offset

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sfja 2025-03-31 16:23:47 +02:00
parent bcd1500f9c
commit cad6ed9604
1 changed files with 4 additions and 4 deletions
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8
vm/vm.c
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@ -154,8 +154,8 @@ void vm_start(Drive* boot_drive, IODevice* io_device)
uint16_t addr; uint16_t addr;
if (addr_is_reg) { if (addr_is_reg) {
Reg reg = is_store ? ins_dst_reg(ins) : ins_op2_reg(ins); Reg reg = is_store ? ins_dst_reg(ins) : ins_op2_reg(ins);
uint16_t offset = eat_uint16(vm); int16_t offset = (int16_t)eat_uint16(vm);
addr = vm->regs[reg] + offset; addr = (uint16_t)((int16_t)vm->regs[reg] + offset);
} else { } else {
addr = eat_uint16(vm); addr = eat_uint16(vm);
} }
@ -186,8 +186,8 @@ void vm_start(Drive* boot_drive, IODevice* io_device)
uint16_t addr; uint16_t addr;
if (addr_is_reg) { if (addr_is_reg) {
Reg reg = is_store ? ins_dst_reg(ins) : ins_op2_reg(ins); Reg reg = is_store ? ins_dst_reg(ins) : ins_op2_reg(ins);
uint16_t offset = eat_uint16(vm); int16_t offset = (int16_t)eat_uint16(vm);
addr = vm->regs[reg] + offset; addr = (uint16_t)((int16_t)vm->regs[reg] + offset);
} else { } else {
addr = eat_uint16(vm); addr = eat_uint16(vm);
} }