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