520 lines
14 KiB
C
520 lines
14 KiB
C
/****************************************************************************
|
|
*
|
|
* Realmode X86 Emulator Library
|
|
*
|
|
* Copyright (C) 1996-1999 SciTech Software, Inc.
|
|
* Copyright (C) David Mosberger-Tang
|
|
* Copyright (C) 1999 Egbert Eich
|
|
*
|
|
* ========================================================================
|
|
*
|
|
* Permission to use, copy, modify, distribute, and sell this software and
|
|
* its documentation for any purpose is hereby granted without fee,
|
|
* provided that the above copyright notice appear in all copies and that
|
|
* both that copyright notice and this permission notice appear in
|
|
* supporting documentation, and that the name of the authors not be used
|
|
* in advertising or publicity pertaining to distribution of the software
|
|
* without specific, written prior permission. The authors makes no
|
|
* representations about the suitability of this software for any purpose.
|
|
* It is provided "as is" without express or implied warranty.
|
|
*
|
|
* THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
|
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
|
|
* EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
|
|
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
|
|
* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
|
|
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
|
|
* PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
* ========================================================================
|
|
*
|
|
* Language: ANSI C
|
|
* Environment: Any
|
|
* Developer: Kendall Bennett
|
|
*
|
|
* Description: This file includes subroutines which are related to
|
|
* programmed I/O and memory access. Included in this module
|
|
* are default functions with limited usefulness. For real
|
|
* uses these functions will most likely be overriden by the
|
|
* user library.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#include "x86emu.h"
|
|
#include "x86emu/x86emui.h"
|
|
#include "x86emu/regs.h"
|
|
#include "x86emu/debug.h"
|
|
#include "x86emu/prim_ops.h"
|
|
#ifndef NO_SYS_HEADERS
|
|
#include <string.h>
|
|
#endif
|
|
|
|
# ifdef __GNUC__
|
|
|
|
/* Define some packed structures to use with unaligned accesses */
|
|
|
|
struct __una_u64 { u64 x __attribute__((packed)); };
|
|
struct __una_u32 { u32 x __attribute__((packed)); };
|
|
struct __una_u16 { u16 x __attribute__((packed)); };
|
|
|
|
/* Elemental unaligned loads */
|
|
|
|
static __inline__ u64 ldq_u(u64 *p)
|
|
{
|
|
const struct __una_u64 *ptr = (const struct __una_u64 *) p;
|
|
return ptr->x;
|
|
}
|
|
|
|
static __inline__ u32 ldl_u(u32 *p)
|
|
{
|
|
const struct __una_u32 *ptr = (const struct __una_u32 *) p;
|
|
return ptr->x;
|
|
}
|
|
|
|
static __inline__ u16 ldw_u(u16 *p)
|
|
{
|
|
const struct __una_u16 *ptr = (const struct __una_u16 *) p;
|
|
return ptr->x;
|
|
}
|
|
|
|
/* Elemental unaligned stores */
|
|
|
|
static __inline__ void stq_u(u64 val, u64 *p)
|
|
{
|
|
struct __una_u64 *ptr = (struct __una_u64 *) p;
|
|
ptr->x = val;
|
|
}
|
|
|
|
static __inline__ void stl_u(u32 val, u32 *p)
|
|
{
|
|
struct __una_u32 *ptr = (struct __una_u32 *) p;
|
|
ptr->x = val;
|
|
}
|
|
|
|
static __inline__ void stw_u(u16 val, u16 *p)
|
|
{
|
|
struct __una_u16 *ptr = (struct __una_u16 *) p;
|
|
ptr->x = val;
|
|
}
|
|
# else /* !__GNUC__ */
|
|
|
|
static __inline__ u64 ldq_u(u64 *p)
|
|
{
|
|
u64 ret;
|
|
memmove(&ret, p, sizeof(*p));
|
|
return ret;
|
|
}
|
|
|
|
static __inline__ u32 ldl_u(u32 *p)
|
|
{
|
|
u32 ret;
|
|
memmove(&ret, p, sizeof(*p));
|
|
return ret;
|
|
}
|
|
|
|
static __inline__ u16 ldw_u(u16 *p)
|
|
{
|
|
u16 ret;
|
|
memmove(&ret, p, sizeof(*p));
|
|
return ret;
|
|
}
|
|
|
|
static __inline__ void stq_u(u64 val, u64 *p)
|
|
{
|
|
u64 tmp = val;
|
|
memmove(p, &tmp, sizeof(*p));
|
|
}
|
|
|
|
static __inline__ void stl_u(u32 val, u32 *p)
|
|
{
|
|
u32 tmp = val;
|
|
memmove(p, &tmp, sizeof(*p));
|
|
}
|
|
|
|
static __inline__ void stw_u(u16 val, u16 *p)
|
|
{
|
|
u16 tmp = val;
|
|
memmove(p, &tmp, sizeof(*p));
|
|
}
|
|
|
|
# endif /* __GNUC__ */
|
|
/*------------------------- Global Variables ------------------------------*/
|
|
|
|
X86EMU_sysEnv _X86EMU_env; /* Global emulator machine state */
|
|
X86EMU_intrFuncs _X86EMU_intrTab[256];
|
|
|
|
/*----------------------------- Implementation ----------------------------*/
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - Emulator memory address to read
|
|
|
|
RETURNS:
|
|
Byte value read from emulator memory.
|
|
|
|
REMARKS:
|
|
Reads a byte value from the emulator memory.
|
|
****************************************************************************/
|
|
u8 X86API rdb(
|
|
u32 addr)
|
|
{
|
|
u8 val;
|
|
|
|
if (addr > M.mem_size - 1) {
|
|
DB(printk("mem_read: address %#lx out of range!\n", addr);)
|
|
HALT_SYS();
|
|
}
|
|
val = *(u8*)(M.mem_base + addr);
|
|
DB( if (DEBUG_MEM_TRACE())
|
|
printk("%#08x 1 -> %#x\n", addr, val);)
|
|
return val;
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - Emulator memory address to read
|
|
|
|
RETURNS:
|
|
Word value read from emulator memory.
|
|
|
|
REMARKS:
|
|
Reads a word value from the emulator memory.
|
|
****************************************************************************/
|
|
u16 X86API rdw(
|
|
u32 addr)
|
|
{
|
|
u16 val = 0;
|
|
|
|
if (addr > M.mem_size - 2) {
|
|
DB(printk("mem_read: address %#lx out of range!\n", addr);)
|
|
HALT_SYS();
|
|
}
|
|
#ifdef __BIG_ENDIAN__
|
|
if (addr & 0x1) {
|
|
val = (*(u8*)(M.mem_base + addr) |
|
|
(*(u8*)(M.mem_base + addr + 1) << 8));
|
|
}
|
|
else
|
|
#endif
|
|
val = ldw_u((u16*)(M.mem_base + addr));
|
|
DB( if (DEBUG_MEM_TRACE())
|
|
printk("%#08x 2 -> %#x\n", addr, val);)
|
|
return val;
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - Emulator memory address to read
|
|
|
|
RETURNS:
|
|
Long value read from emulator memory.
|
|
REMARKS:
|
|
Reads a long value from the emulator memory.
|
|
****************************************************************************/
|
|
u32 X86API rdl(
|
|
u32 addr)
|
|
{
|
|
u32 val = 0;
|
|
|
|
if (addr > M.mem_size - 4) {
|
|
DB(printk("mem_read: address %#lx out of range!\n", addr);)
|
|
HALT_SYS();
|
|
}
|
|
#ifdef __BIG_ENDIAN__
|
|
if (addr & 0x3) {
|
|
val = (*(u8*)(M.mem_base + addr + 0) |
|
|
(*(u8*)(M.mem_base + addr + 1) << 8) |
|
|
(*(u8*)(M.mem_base + addr + 2) << 16) |
|
|
(*(u8*)(M.mem_base + addr + 3) << 24));
|
|
}
|
|
else
|
|
#endif
|
|
val = ldl_u((u32*)(M.mem_base + addr));
|
|
DB( if (DEBUG_MEM_TRACE())
|
|
printk("%#08x 4 -> %#x\n", addr, val);)
|
|
return val;
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - Emulator memory address to read
|
|
val - Value to store
|
|
|
|
REMARKS:
|
|
Writes a byte value to emulator memory.
|
|
****************************************************************************/
|
|
void X86API wrb(
|
|
u32 addr,
|
|
u8 val)
|
|
{
|
|
DB( if (DEBUG_MEM_TRACE())
|
|
printk("%#08x 1 <- %#x\n", addr, val);)
|
|
if (addr > M.mem_size - 1) {
|
|
DB(printk("mem_write: address %#lx out of range!\n", addr);)
|
|
HALT_SYS();
|
|
}
|
|
*(u8*)(M.mem_base + addr) = val;
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - Emulator memory address to read
|
|
val - Value to store
|
|
|
|
REMARKS:
|
|
Writes a word value to emulator memory.
|
|
****************************************************************************/
|
|
void X86API wrw(
|
|
u32 addr,
|
|
u16 val)
|
|
{
|
|
DB( if (DEBUG_MEM_TRACE())
|
|
printk("%#08x 2 <- %#x\n", addr, val);)
|
|
if (addr > M.mem_size - 2) {
|
|
DB(printk("mem_write: address %#lx out of range!\n", addr);)
|
|
HALT_SYS();
|
|
}
|
|
#ifdef __BIG_ENDIAN__
|
|
if (addr & 0x1) {
|
|
*(u8*)(M.mem_base + addr + 0) = (val >> 0) & 0xff;
|
|
*(u8*)(M.mem_base + addr + 1) = (val >> 8) & 0xff;
|
|
}
|
|
else
|
|
#endif
|
|
stw_u(val,(u16*)(M.mem_base + addr));
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - Emulator memory address to read
|
|
val - Value to store
|
|
|
|
REMARKS:
|
|
Writes a long value to emulator memory.
|
|
****************************************************************************/
|
|
void X86API wrl(
|
|
u32 addr,
|
|
u32 val)
|
|
{
|
|
DB( if (DEBUG_MEM_TRACE())
|
|
printk("%#08x 4 <- %#x\n", addr, val);)
|
|
if (addr > M.mem_size - 4) {
|
|
DB(printk("mem_write: address %#lx out of range!\n", addr);)
|
|
HALT_SYS();
|
|
}
|
|
#ifdef __BIG_ENDIAN__
|
|
if (addr & 0x1) {
|
|
*(u8*)(M.mem_base + addr + 0) = (val >> 0) & 0xff;
|
|
*(u8*)(M.mem_base + addr + 1) = (val >> 8) & 0xff;
|
|
*(u8*)(M.mem_base + addr + 2) = (val >> 16) & 0xff;
|
|
*(u8*)(M.mem_base + addr + 3) = (val >> 24) & 0xff;
|
|
}
|
|
else
|
|
#endif
|
|
stl_u(val,(u32*)(M.mem_base + addr));
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - PIO address to read
|
|
RETURN:
|
|
0
|
|
REMARKS:
|
|
Default PIO byte read function. Doesn't perform real inb.
|
|
****************************************************************************/
|
|
static u8 X86API p_inb(
|
|
X86EMU_pioAddr addr)
|
|
{
|
|
DB( if (DEBUG_IO_TRACE())
|
|
printk("inb %#04x \n", addr);)
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - PIO address to read
|
|
RETURN:
|
|
0
|
|
REMARKS:
|
|
Default PIO word read function. Doesn't perform real inw.
|
|
****************************************************************************/
|
|
static u16 X86API p_inw(
|
|
X86EMU_pioAddr addr)
|
|
{
|
|
DB( if (DEBUG_IO_TRACE())
|
|
printk("inw %#04x \n", addr);)
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - PIO address to read
|
|
RETURN:
|
|
0
|
|
REMARKS:
|
|
Default PIO long read function. Doesn't perform real inl.
|
|
****************************************************************************/
|
|
static u32 X86API p_inl(
|
|
X86EMU_pioAddr addr)
|
|
{
|
|
DB( if (DEBUG_IO_TRACE())
|
|
printk("inl %#04x \n", addr);)
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - PIO address to write
|
|
val - Value to store
|
|
REMARKS:
|
|
Default PIO byte write function. Doesn't perform real outb.
|
|
****************************************************************************/
|
|
static void X86API p_outb(
|
|
X86EMU_pioAddr addr,
|
|
u8 val)
|
|
{
|
|
DB( if (DEBUG_IO_TRACE())
|
|
printk("outb %#02x -> %#04x \n", val, addr);)
|
|
return;
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - PIO address to write
|
|
val - Value to store
|
|
REMARKS:
|
|
Default PIO word write function. Doesn't perform real outw.
|
|
****************************************************************************/
|
|
static void X86API p_outw(
|
|
X86EMU_pioAddr addr,
|
|
u16 val)
|
|
{
|
|
DB( if (DEBUG_IO_TRACE())
|
|
printk("outw %#04x -> %#04x \n", val, addr);)
|
|
return;
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - PIO address to write
|
|
val - Value to store
|
|
REMARKS:
|
|
Default PIO ;ong write function. Doesn't perform real outl.
|
|
****************************************************************************/
|
|
static void X86API p_outl(
|
|
X86EMU_pioAddr addr,
|
|
u32 val)
|
|
{
|
|
DB( if (DEBUG_IO_TRACE())
|
|
printk("outl %#08x -> %#04x \n", val, addr);)
|
|
return;
|
|
}
|
|
|
|
/*------------------------- Global Variables ------------------------------*/
|
|
|
|
u8 (X86APIP sys_rdb)(u32 addr) = rdb;
|
|
u16 (X86APIP sys_rdw)(u32 addr) = rdw;
|
|
u32 (X86APIP sys_rdl)(u32 addr) = rdl;
|
|
void (X86APIP sys_wrb)(u32 addr,u8 val) = wrb;
|
|
void (X86APIP sys_wrw)(u32 addr,u16 val) = wrw;
|
|
void (X86APIP sys_wrl)(u32 addr,u32 val) = wrl;
|
|
u8 (X86APIP sys_inb)(X86EMU_pioAddr addr) = p_inb;
|
|
u16 (X86APIP sys_inw)(X86EMU_pioAddr addr) = p_inw;
|
|
u32 (X86APIP sys_inl)(X86EMU_pioAddr addr) = p_inl;
|
|
void (X86APIP sys_outb)(X86EMU_pioAddr addr, u8 val) = p_outb;
|
|
void (X86APIP sys_outw)(X86EMU_pioAddr addr, u16 val) = p_outw;
|
|
void (X86APIP sys_outl)(X86EMU_pioAddr addr, u32 val) = p_outl;
|
|
|
|
/*----------------------------- Setup -------------------------------------*/
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
funcs - New memory function pointers to make active
|
|
|
|
REMARKS:
|
|
This function is used to set the pointers to functions which access
|
|
memory space, allowing the user application to override these functions
|
|
and hook them out as necessary for their application.
|
|
****************************************************************************/
|
|
void X86EMU_setupMemFuncs(
|
|
X86EMU_memFuncs *funcs)
|
|
{
|
|
sys_rdb = funcs->rdb;
|
|
sys_rdw = funcs->rdw;
|
|
sys_rdl = funcs->rdl;
|
|
sys_wrb = funcs->wrb;
|
|
sys_wrw = funcs->wrw;
|
|
sys_wrl = funcs->wrl;
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
funcs - New programmed I/O function pointers to make active
|
|
|
|
REMARKS:
|
|
This function is used to set the pointers to functions which access
|
|
I/O space, allowing the user application to override these functions
|
|
and hook them out as necessary for their application.
|
|
****************************************************************************/
|
|
void X86EMU_setupPioFuncs(
|
|
X86EMU_pioFuncs *funcs)
|
|
{
|
|
sys_inb = funcs->inb;
|
|
sys_inw = funcs->inw;
|
|
sys_inl = funcs->inl;
|
|
sys_outb = funcs->outb;
|
|
sys_outw = funcs->outw;
|
|
sys_outl = funcs->outl;
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
funcs - New interrupt vector table to make active
|
|
|
|
REMARKS:
|
|
This function is used to set the pointers to functions which handle
|
|
interrupt processing in the emulator, allowing the user application to
|
|
hook interrupts as necessary for their application. Any interrupts that
|
|
are not hooked by the user application, and reflected and handled internally
|
|
in the emulator via the interrupt vector table. This allows the application
|
|
to get control when the code being emulated executes specific software
|
|
interrupts.
|
|
****************************************************************************/
|
|
void X86EMU_setupIntrFuncs(
|
|
X86EMU_intrFuncs funcs[])
|
|
{
|
|
int i;
|
|
|
|
for (i=0; i < 256; i++)
|
|
_X86EMU_intrTab[i] = NULL;
|
|
if (funcs) {
|
|
for (i = 0; i < 256; i++)
|
|
_X86EMU_intrTab[i] = funcs[i];
|
|
}
|
|
}
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
int - New software interrupt to prepare for
|
|
|
|
REMARKS:
|
|
This function is used to set up the emulator state to exceute a software
|
|
interrupt. This can be used by the user application code to allow an
|
|
interrupt to be hooked, examined and then reflected back to the emulator
|
|
so that the code in the emulator will continue processing the software
|
|
interrupt as per normal. This essentially allows system code to actively
|
|
hook and handle certain software interrupts as necessary.
|
|
****************************************************************************/
|
|
void X86EMU_prepareForInt(
|
|
int num)
|
|
{
|
|
push_word((u16)M.x86.R_FLG);
|
|
CLEAR_FLAG(F_IF);
|
|
CLEAR_FLAG(F_TF);
|
|
push_word(M.x86.R_CS);
|
|
M.x86.R_CS = mem_access_word(num * 4 + 2);
|
|
push_word(M.x86.R_IP);
|
|
M.x86.R_IP = mem_access_word(num * 4);
|
|
M.x86.intr = 0;
|
|
}
|