/*
* PARAMETERS:
* addr - Emulator memory address to read
*
* RETURNS:
* Byte value read from emulator memory.
*
* REMARKS:
* Reads a byte value from the emulator memory.
*/
static uint8_t
rdb(struct x86emu *emu, uint32_t addr)
{
if (addr > emu->mem_size - 1)
x86emu_halt_sys(emu);
return emu->mem_base[addr];
}
/*
* PARAMETERS:
* addr - Emulator memory address to read
* val - Value to store
*
* REMARKS:
* Writes a byte value to emulator memory.
*/
static void
wrb(struct x86emu *emu, uint32_t addr, uint8_t val)
{
if (addr > emu->mem_size - 1)
x86emu_halt_sys(emu);
emu->mem_base[addr] = val;
}
static void
x86bios_set_fault(struct x86emu *emu, uint32_t addr)
{
x86bios_fault = 1;
x86bios_fault_addr = addr;
x86bios_fault_cs = emu->x86.R_CS;
x86bios_fault_ip = emu->x86.R_IP;
x86emu_halt_sys(emu);
}
/*
* PARAMETERS:
* addr - Emulator memory address to read
* val - Value to store
*
* REMARKS:
* Writes a word value to emulator memory.
*/
static void
wrw(struct x86emu *emu, uint32_t addr, uint16_t val)
{
if (addr > emu->mem_size - 2)
x86emu_halt_sys(emu);
#ifdef __STRICT_ALIGNMENT
if (addr & 1) {
u_int8_t *a = emu->mem_base + addr;
*((a + 0)) = (val >> 0) & 0xff;
*((a + 1)) = (val >> 8) & 0xff;
} else
/*
* PARAMETERS:
* addr - Emulator memory address to read
*
* RETURNS:
* Word value read from emulator memory.
*
* REMARKS:
* Reads a word value from the emulator memory.
*/
static uint16_t
rdw(struct x86emu *emu, uint32_t addr)
{
if (addr > emu->mem_size - 2)
x86emu_halt_sys(emu);
#ifdef __STRICT_ALIGNMENT
if (addr & 1) {
u_int8_t *a = emu->mem_base + addr;
u_int16_t r;
r = ((*(a + 0) << 0) & 0x00ff) |
((*(a + 1) << 8) & 0xff00);
return r;
} else
return letoh32(*(u_int32_t *)(emu->mem_base + addr));
#else
return letoh16(*(u_int16_t *)(emu->mem_base + addr));
#endif
}
