| /* | |
| * Emulation of privileged instructions | |
| * | |
| * Copyright 1995 Alexandre Julliard | |
| * | |
| * This library is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Lesser General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2.1 of the License, or (at your option) any later version. | |
| * | |
| * This library is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| * Lesser General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU Lesser General Public | |
| * License along with this library; if not, write to the Free Software | |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| */ | |
| #include "windef.h" | |
| #include "wingdi.h" | |
| #include "wine/winuser16.h" | |
| #include "module.h" | |
| #include "miscemu.h" | |
| #include "selectors.h" | |
| #include "wine/debug.h" | |
| WINE_DEFAULT_DEBUG_CHANNEL(int); | |
| WINE_DECLARE_DEBUG_CHANNEL(io); | |
| #ifdef __i386__ | |
| inline static void add_stack( CONTEXT86 *context, int offset ) | |
| { | |
| if (ISV86(context) || !IS_SELECTOR_32BIT(context->SegSs)) | |
| ADD_LOWORD( context->Esp, offset ); | |
| else | |
| context->Esp += offset; | |
| } | |
| inline static void *make_ptr( CONTEXT86 *context, DWORD seg, DWORD off, int long_addr ) | |
| { | |
| if (ISV86(context)) return PTR_REAL_TO_LIN( seg, off ); | |
| if (IS_SELECTOR_SYSTEM(seg)) return (void *)off; | |
| if (!long_addr) off = LOWORD(off); | |
| return (char *) MapSL( MAKESEGPTR( seg, 0 ) ) + off; | |
| } | |
| inline static void *get_stack( CONTEXT86 *context ) | |
| { | |
| if (ISV86(context)) | |
| return PTR_REAL_TO_LIN( context->SegSs, context->Esp ); | |
| if (IS_SELECTOR_SYSTEM(context->SegSs)) | |
| return (void *)context->Esp; | |
| if (IS_SELECTOR_32BIT(context->SegSs)) | |
| return (char *) MapSL( MAKESEGPTR( context->SegSs, 0 ) ) + context->Esp; | |
| return MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Esp) ) ); | |
| } | |
| /*********************************************************************** | |
| * INSTR_ReplaceSelector | |
| * | |
| * Try to replace an invalid selector by a valid one. | |
| * The only selector where it is allowed to do "mov ax,40;mov es,ax" | |
| * is the so called 'bimodal' selector 0x40, which points to the BIOS | |
| * data segment. Used by (at least) Borland products (and programs compiled | |
| * using Borland products). | |
| * | |
| * See Undocumented Windows, Chapter 5, __0040. | |
| */ | |
| static BOOL INSTR_ReplaceSelector( CONTEXT86 *context, WORD *sel ) | |
| { | |
| extern char Call16_Start, Call16_End; | |
| if (IS_SELECTOR_SYSTEM(context->SegCs)) | |
| if ( (char *)context->Eip >= &Call16_Start | |
| && (char *)context->Eip < &Call16_End ) | |
| { | |
| /* Saved selector may have become invalid when the relay code */ | |
| /* tries to restore it. We simply clear it. */ | |
| *sel = 0; | |
| return TRUE; | |
| } | |
| if (*sel == 0x40) | |
| { | |
| static WORD sys_timer = 0; | |
| if (!sys_timer) | |
| sys_timer = CreateSystemTimer( 55, DOSMEM_Tick ); | |
| *sel = DOSMEM_BiosDataSeg; | |
| return TRUE; | |
| } | |
| if (!IS_SELECTOR_SYSTEM(*sel) && !IS_SELECTOR_FREE(*sel)) | |
| ERR("Got protection fault on valid selector, maybe your kernel is too old?\n" ); | |
| return FALSE; /* Can't replace selector, crashdump */ | |
| } | |
| /*********************************************************************** | |
| * INSTR_GetOperandAddr | |
| * | |
| * Return the address of an instruction operand (from the mod/rm byte). | |
| */ | |
| static BYTE *INSTR_GetOperandAddr( CONTEXT86 *context, BYTE *instr, | |
| int long_addr, int segprefix, int *len ) | |
| { | |
| int mod, rm, base, index = 0, ss = 0, seg = 0, off; | |
| #define GET_VAL(val,type) \ | |
| { *val = *(type *)instr; instr += sizeof(type); *len += sizeof(type); } | |
| *len = 0; | |
| GET_VAL( &mod, BYTE ); | |
| rm = mod & 7; | |
| mod >>= 6; | |
| if (mod == 3) | |
| { | |
| switch(rm) | |
| { | |
| case 0: return (BYTE *)&context->Eax; | |
| case 1: return (BYTE *)&context->Ecx; | |
| case 2: return (BYTE *)&context->Edx; | |
| case 3: return (BYTE *)&context->Ebx; | |
| case 4: return (BYTE *)&context->Esp; | |
| case 5: return (BYTE *)&context->Ebp; | |
| case 6: return (BYTE *)&context->Esi; | |
| case 7: return (BYTE *)&context->Edi; | |
| } | |
| } | |
| if (long_addr) | |
| { | |
| if (rm == 4) | |
| { | |
| BYTE sib; | |
| GET_VAL( &sib, BYTE ); | |
| rm = sib & 7; | |
| ss = sib >> 6; | |
| switch(sib >> 3) | |
| { | |
| case 0: index = context->Eax; break; | |
| case 1: index = context->Ecx; break; | |
| case 2: index = context->Edx; break; | |
| case 3: index = context->Ebx; break; | |
| case 4: index = 0; break; | |
| case 5: index = context->Ebp; break; | |
| case 6: index = context->Esi; break; | |
| case 7: index = context->Edi; break; | |
| } | |
| } | |
| switch(rm) | |
| { | |
| case 0: base = context->Eax; seg = context->SegDs; break; | |
| case 1: base = context->Ecx; seg = context->SegDs; break; | |
| case 2: base = context->Edx; seg = context->SegDs; break; | |
| case 3: base = context->Ebx; seg = context->SegDs; break; | |
| case 4: base = context->Esp; seg = context->SegSs; break; | |
| case 5: base = context->Ebp; seg = context->SegSs; break; | |
| case 6: base = context->Esi; seg = context->SegDs; break; | |
| case 7: base = context->Edi; seg = context->SegDs; break; | |
| } | |
| switch (mod) | |
| { | |
| case 0: | |
| if (rm == 5) /* special case: ds:(disp32) */ | |
| { | |
| GET_VAL( &base, DWORD ); | |
| seg = context->SegDs; | |
| } | |
| break; | |
| case 1: /* 8-bit disp */ | |
| GET_VAL( &off, BYTE ); | |
| base += (signed char)off; | |
| break; | |
| case 2: /* 32-bit disp */ | |
| GET_VAL( &off, DWORD ); | |
| base += (signed long)off; | |
| break; | |
| } | |
| } | |
| else /* short address */ | |
| { | |
| switch(rm) | |
| { | |
| case 0: /* ds:(bx,si) */ | |
| base = LOWORD(context->Ebx) + LOWORD(context->Esi); | |
| seg = context->SegDs; | |
| break; | |
| case 1: /* ds:(bx,di) */ | |
| base = LOWORD(context->Ebx) + LOWORD(context->Edi); | |
| seg = context->SegDs; | |
| break; | |
| case 2: /* ss:(bp,si) */ | |
| base = LOWORD(context->Ebp) + LOWORD(context->Esi); | |
| seg = context->SegSs; | |
| break; | |
| case 3: /* ss:(bp,di) */ | |
| base = LOWORD(context->Ebp) + LOWORD(context->Edi); | |
| seg = context->SegSs; | |
| break; | |
| case 4: /* ds:(si) */ | |
| base = LOWORD(context->Esi); | |
| seg = context->SegDs; | |
| break; | |
| case 5: /* ds:(di) */ | |
| base = LOWORD(context->Edi); | |
| seg = context->SegDs; | |
| break; | |
| case 6: /* ss:(bp) */ | |
| base = LOWORD(context->Ebp); | |
| seg = context->SegSs; | |
| break; | |
| case 7: /* ds:(bx) */ | |
| base = LOWORD(context->Ebx); | |
| seg = context->SegDs; | |
| break; | |
| } | |
| switch(mod) | |
| { | |
| case 0: | |
| if (rm == 6) /* special case: ds:(disp16) */ | |
| { | |
| GET_VAL( &base, WORD ); | |
| seg = context->SegDs; | |
| } | |
| break; | |
| case 1: /* 8-bit disp */ | |
| GET_VAL( &off, BYTE ); | |
| base += (signed char)off; | |
| break; | |
| case 2: /* 16-bit disp */ | |
| GET_VAL( &off, WORD ); | |
| base += (signed short)off; | |
| break; | |
| } | |
| base &= 0xffff; | |
| } | |
| if (segprefix != -1) seg = segprefix; | |
| /* Make sure the segment and offset are valid */ | |
| if (IS_SELECTOR_SYSTEM(seg)) return (BYTE *)(base + (index << ss)); | |
| if (((seg & 7) != 7) || IS_SELECTOR_FREE(seg)) return NULL; | |
| if (wine_ldt_copy.limit[seg >> 3] < (base + (index << ss))) return NULL; | |
| return (char *) MapSL( MAKESEGPTR( seg, 0 ) ) + base + (index << ss); | |
| #undef GET_VAL | |
| } | |
| /*********************************************************************** | |
| * INSTR_EmulateLDS | |
| * | |
| * Emulate the LDS (and LES,LFS,etc.) instruction. | |
| */ | |
| static BOOL INSTR_EmulateLDS( CONTEXT86 *context, BYTE *instr, int long_op, | |
| int long_addr, int segprefix, int *len ) | |
| { | |
| WORD seg; | |
| BYTE *regmodrm = instr + 1 + (*instr == 0x0f); | |
| BYTE *addr = INSTR_GetOperandAddr( context, regmodrm, | |
| long_addr, segprefix, len ); | |
| if (!addr) | |
| return FALSE; /* Unable to emulate it */ | |
| seg = *(WORD *)(addr + (long_op ? 4 : 2)); | |
| if (!INSTR_ReplaceSelector( context, &seg )) | |
| return FALSE; /* Unable to emulate it */ | |
| /* Now store the offset in the correct register */ | |
| switch((*regmodrm >> 3) & 7) | |
| { | |
| case 0: | |
| if (long_op) context->Eax = *(DWORD *)addr; | |
| else SET_LOWORD(context->Eax,*(WORD *)addr); | |
| break; | |
| case 1: | |
| if (long_op) context->Ecx = *(DWORD *)addr; | |
| else SET_LOWORD(context->Ecx,*(WORD *)addr); | |
| break; | |
| case 2: | |
| if (long_op) context->Edx = *(DWORD *)addr; | |
| else SET_LOWORD(context->Edx,*(WORD *)addr); | |
| break; | |
| case 3: | |
| if (long_op) context->Ebx = *(DWORD *)addr; | |
| else SET_LOWORD(context->Ebx,*(WORD *)addr); | |
| break; | |
| case 4: | |
| if (long_op) context->Esp = *(DWORD *)addr; | |
| else SET_LOWORD(context->Esp,*(WORD *)addr); | |
| break; | |
| case 5: | |
| if (long_op) context->Ebp = *(DWORD *)addr; | |
| else SET_LOWORD(context->Ebp,*(WORD *)addr); | |
| break; | |
| case 6: | |
| if (long_op) context->Esi = *(DWORD *)addr; | |
| else SET_LOWORD(context->Esi,*(WORD *)addr); | |
| break; | |
| case 7: | |
| if (long_op) context->Edi = *(DWORD *)addr; | |
| else SET_LOWORD(context->Edi,*(WORD *)addr); | |
| break; | |
| } | |
| /* Store the correct segment in the segment register */ | |
| switch(*instr) | |
| { | |
| case 0xc4: context->SegEs = seg; break; /* les */ | |
| case 0xc5: context->SegDs = seg; break; /* lds */ | |
| case 0x0f: switch(instr[1]) | |
| { | |
| case 0xb2: context->SegSs = seg; break; /* lss */ | |
| case 0xb4: context->SegFs = seg; break; /* lfs */ | |
| case 0xb5: context->SegGs = seg; break; /* lgs */ | |
| } | |
| break; | |
| } | |
| /* Add the opcode size to the total length */ | |
| *len += 1 + (*instr == 0x0f); | |
| return TRUE; | |
| } | |
| /*********************************************************************** | |
| * INSTR_inport | |
| * | |
| * input on a I/O port | |
| */ | |
| static DWORD INSTR_inport( WORD port, int size, CONTEXT86 *context ) | |
| { | |
| DWORD res = IO_inport( port, size ); | |
| if (TRACE_ON(io)) | |
| { | |
| switch(size) | |
| { | |
| case 1: | |
| DPRINTF( "0x%x < %02x @ %04x:%04x\n", port, LOBYTE(res), | |
| (WORD)context->SegCs, LOWORD(context->Eip)); | |
| break; | |
| case 2: | |
| DPRINTF( "0x%x < %04x @ %04x:%04x\n", port, LOWORD(res), | |
| (WORD)context->SegCs, LOWORD(context->Eip)); | |
| break; | |
| case 4: | |
| DPRINTF( "0x%x < %08lx @ %04x:%04x\n", port, res, | |
| (WORD)context->SegCs, LOWORD(context->Eip)); | |
| break; | |
| } | |
| } | |
| return res; | |
| } | |
| /*********************************************************************** | |
| * INSTR_outport | |
| * | |
| * output on a I/O port | |
| */ | |
| static void INSTR_outport( WORD port, int size, DWORD val, CONTEXT86 *context ) | |
| { | |
| IO_outport( port, size, val ); | |
| if (TRACE_ON(io)) | |
| { | |
| switch(size) | |
| { | |
| case 1: | |
| DPRINTF("0x%x > %02x @ %04x:%04x\n", port, LOBYTE(val), | |
| (WORD)context->SegCs, LOWORD(context->Eip)); | |
| break; | |
| case 2: | |
| DPRINTF("0x%x > %04x @ %04x:%04x\n", port, LOWORD(val), | |
| (WORD)context->SegCs, LOWORD(context->Eip)); | |
| break; | |
| case 4: | |
| DPRINTF("0x%x > %08lx @ %04x:%04x\n", port, val, | |
| (WORD)context->SegCs, LOWORD(context->Eip)); | |
| break; | |
| } | |
| } | |
| } | |
| /*********************************************************************** | |
| * INSTR_EmulateInstruction | |
| * | |
| * Emulate a privileged instruction. Returns TRUE if emulation successful. | |
| */ | |
| BOOL INSTR_EmulateInstruction( CONTEXT86 *context ) | |
| { | |
| int prefix, segprefix, prefixlen, len, repX, long_op, long_addr; | |
| SEGPTR gpHandler; | |
| BYTE *instr; | |
| long_op = long_addr = (!ISV86(context) && IS_SELECTOR_32BIT(context->SegCs)); | |
| instr = make_ptr( context, context->SegCs, context->Eip, TRUE ); | |
| if (!instr) return FALSE; | |
| /* First handle any possible prefix */ | |
| segprefix = -1; /* no prefix */ | |
| prefix = 1; | |
| repX = 0; | |
| prefixlen = 0; | |
| while(prefix) | |
| { | |
| switch(*instr) | |
| { | |
| case 0x2e: | |
| segprefix = context->SegCs; | |
| break; | |
| case 0x36: | |
| segprefix = context->SegSs; | |
| break; | |
| case 0x3e: | |
| segprefix = context->SegDs; | |
| break; | |
| case 0x26: | |
| segprefix = context->SegEs; | |
| break; | |
| case 0x64: | |
| segprefix = context->SegFs; | |
| break; | |
| case 0x65: | |
| segprefix = context->SegGs; | |
| break; | |
| case 0x66: | |
| long_op = !long_op; /* opcode size prefix */ | |
| break; | |
| case 0x67: | |
| long_addr = !long_addr; /* addr size prefix */ | |
| break; | |
| case 0xf0: /* lock */ | |
| break; | |
| case 0xf2: /* repne */ | |
| repX = 1; | |
| break; | |
| case 0xf3: /* repe */ | |
| repX = 2; | |
| break; | |
| default: | |
| prefix = 0; /* no more prefixes */ | |
| break; | |
| } | |
| if (prefix) | |
| { | |
| instr++; | |
| prefixlen++; | |
| } | |
| } | |
| /* Now look at the actual instruction */ | |
| switch(*instr) | |
| { | |
| case 0x07: /* pop es */ | |
| case 0x17: /* pop ss */ | |
| case 0x1f: /* pop ds */ | |
| { | |
| WORD seg = *(WORD *)get_stack( context ); | |
| if (INSTR_ReplaceSelector( context, &seg )) | |
| { | |
| switch(*instr) | |
| { | |
| case 0x07: context->SegEs = seg; break; | |
| case 0x17: context->SegSs = seg; break; | |
| case 0x1f: context->SegDs = seg; break; | |
| } | |
| add_stack(context, long_op ? 4 : 2); | |
| context->Eip += prefixlen + 1; | |
| return TRUE; | |
| } | |
| } | |
| break; /* Unable to emulate it */ | |
| case 0x0f: /* extended instruction */ | |
| switch(instr[1]) | |
| { | |
| case 0x22: /* mov eax, crX */ | |
| switch (instr[2]) { | |
| case 0xc0: | |
| ERR("mov eax,cr0 at 0x%08lx, EAX=0x%08lx\n", | |
| context->Eip,context->Eax ); | |
| context->Eip += prefixlen+3; | |
| return TRUE; | |
| default: | |
| break; /*fallthrough to bad instruction handling */ | |
| } | |
| break; /*fallthrough to bad instruction handling */ | |
| case 0x20: /* mov crX, eax */ | |
| switch (instr[2]) { | |
| case 0xe0: /* mov cr4, eax */ | |
| /* CR4 register . See linux/arch/i386/mm/init.c, X86_CR4_ defs | |
| * bit 0: VME Virtual Mode Exception ? | |
| * bit 1: PVI Protected mode Virtual Interrupt | |
| * bit 2: TSD Timestamp disable | |
| * bit 3: DE Debugging extensions | |
| * bit 4: PSE Page size extensions | |
| * bit 5: PAE Physical address extension | |
| * bit 6: MCE Machine check enable | |
| * bit 7: PGE Enable global pages | |
| * bit 8: PCE Enable performance counters at IPL3 | |
| */ | |
| ERR("mov cr4,eax at 0x%08lx\n",context->Eip); | |
| context->Eax = 0; | |
| context->Eip += prefixlen+3; | |
| return TRUE; | |
| case 0xc0: /* mov cr0, eax */ | |
| ERR("mov cr0,eax at 0x%08lx\n",context->Eip); | |
| context->Eax = 0x10; /* FIXME: set more bits ? */ | |
| context->Eip += prefixlen+3; | |
| return TRUE; | |
| default: /* fallthrough to illegal instruction */ | |
| break; | |
| } | |
| /* fallthrough to illegal instruction */ | |
| break; | |
| case 0xa1: /* pop fs */ | |
| { | |
| WORD seg = *(WORD *)get_stack( context ); | |
| if (INSTR_ReplaceSelector( context, &seg )) | |
| { | |
| context->SegFs = seg; | |
| add_stack(context, long_op ? 4 : 2); | |
| context->Eip += prefixlen + 2; | |
| return TRUE; | |
| } | |
| } | |
| break; | |
| case 0xa9: /* pop gs */ | |
| { | |
| WORD seg = *(WORD *)get_stack( context ); | |
| if (INSTR_ReplaceSelector( context, &seg )) | |
| { | |
| context->SegGs = seg; | |
| add_stack(context, long_op ? 4 : 2); | |
| context->Eip += prefixlen + 2; | |
| return TRUE; | |
| } | |
| } | |
| break; | |
| case 0xb2: /* lss addr,reg */ | |
| case 0xb4: /* lfs addr,reg */ | |
| case 0xb5: /* lgs addr,reg */ | |
| if (INSTR_EmulateLDS( context, instr, long_op, | |
| long_addr, segprefix, &len )) | |
| { | |
| context->Eip += prefixlen + len; | |
| return TRUE; | |
| } | |
| break; | |
| } | |
| break; /* Unable to emulate it */ | |
| case 0x6c: /* insb */ | |
| case 0x6d: /* insw/d */ | |
| case 0x6e: /* outsb */ | |
| case 0x6f: /* outsw/d */ | |
| { | |
| int typ = *instr; /* Just in case it's overwritten. */ | |
| int outp = (typ >= 0x6e); | |
| unsigned long count = repX ? | |
| (long_addr ? context->Ecx : LOWORD(context->Ecx)) : 1; | |
| int opsize = (typ & 1) ? (long_op ? 4 : 2) : 1; | |
| int step = (context->EFlags & 0x400) ? -opsize : +opsize; | |
| int seg = outp ? context->SegDs : context->SegEs; /* FIXME: is this right? */ | |
| if (outp) | |
| /* FIXME: Check segment readable. */ | |
| (void)0; | |
| else | |
| /* FIXME: Check segment writeable. */ | |
| (void)0; | |
| if (repX) | |
| { | |
| if (long_addr) context->Ecx = 0; | |
| else SET_LOWORD(context->Ecx,0); | |
| } | |
| while (count-- > 0) | |
| { | |
| void *data; | |
| WORD dx = LOWORD(context->Edx); | |
| if (outp) | |
| { | |
| data = make_ptr( context, seg, context->Esi, long_addr ); | |
| if (long_addr) context->Esi += step; | |
| else ADD_LOWORD(context->Esi,step); | |
| } | |
| else | |
| { | |
| data = make_ptr( context, seg, context->Edi, long_addr ); | |
| if (long_addr) context->Edi += step; | |
| else ADD_LOWORD(context->Edi,step); | |
| } | |
| switch (typ) | |
| { | |
| case 0x6c: | |
| *(BYTE *)data = INSTR_inport( dx, 1, context ); | |
| break; | |
| case 0x6d: | |
| if (long_op) | |
| *(DWORD *)data = INSTR_inport( dx, 4, context ); | |
| else | |
| *(WORD *)data = INSTR_inport( dx, 2, context ); | |
| break; | |
| case 0x6e: | |
| INSTR_outport( dx, 1, *(BYTE *)data, context ); | |
| break; | |
| case 0x6f: | |
| if (long_op) | |
| INSTR_outport( dx, 4, *(DWORD *)data, context ); | |
| else | |
| INSTR_outport( dx, 2, *(WORD *)data, context ); | |
| break; | |
| } | |
| } | |
| context->Eip += prefixlen + 1; | |
| } | |
| return TRUE; | |
| case 0x8e: /* mov XX,segment_reg */ | |
| { | |
| WORD seg; | |
| BYTE *addr = INSTR_GetOperandAddr(context, instr + 1, | |
| long_addr, segprefix, &len ); | |
| if (!addr) | |
| break; /* Unable to emulate it */ | |
| seg = *(WORD *)addr; | |
| if (!INSTR_ReplaceSelector( context, &seg )) | |
| break; /* Unable to emulate it */ | |
| switch((instr[1] >> 3) & 7) | |
| { | |
| case 0: | |
| context->SegEs = seg; | |
| context->Eip += prefixlen + len + 1; | |
| return TRUE; | |
| case 1: /* cs */ | |
| break; | |
| case 2: | |
| context->SegSs = seg; | |
| context->Eip += prefixlen + len + 1; | |
| return TRUE; | |
| case 3: | |
| context->SegDs = seg; | |
| context->Eip += prefixlen + len + 1; | |
| return TRUE; | |
| case 4: | |
| context->SegFs = seg; | |
| context->Eip += prefixlen + len + 1; | |
| return TRUE; | |
| case 5: | |
| context->SegGs = seg; | |
| context->Eip += prefixlen + len + 1; | |
| return TRUE; | |
| case 6: /* unused */ | |
| case 7: /* unused */ | |
| break; | |
| } | |
| } | |
| break; /* Unable to emulate it */ | |
| case 0xc4: /* les addr,reg */ | |
| case 0xc5: /* lds addr,reg */ | |
| if (INSTR_EmulateLDS( context, instr, long_op, | |
| long_addr, segprefix, &len )) | |
| { | |
| context->Eip += prefixlen + len; | |
| return TRUE; | |
| } | |
| break; /* Unable to emulate it */ | |
| case 0xcd: /* int <XX> */ | |
| if (long_op) | |
| { | |
| FARPROC48 addr = INT_GetPMHandler48( instr[1] ); | |
| DWORD *stack = get_stack( context ); | |
| /* Push the flags and return address on the stack */ | |
| *(--stack) = context->EFlags; | |
| *(--stack) = context->SegCs; | |
| *(--stack) = context->Eip + prefixlen + 2; | |
| add_stack(context, -3 * sizeof(DWORD)); | |
| /* Jump to the interrupt handler */ | |
| context->SegCs = addr.selector; | |
| context->Eip = addr.offset; | |
| return TRUE; | |
| } | |
| else | |
| { | |
| FARPROC16 addr = INT_GetPMHandler( instr[1] ); | |
| WORD *stack = get_stack( context ); | |
| /* Push the flags and return address on the stack */ | |
| *(--stack) = LOWORD(context->EFlags); | |
| *(--stack) = context->SegCs; | |
| *(--stack) = LOWORD(context->Eip) + prefixlen + 2; | |
| add_stack(context, -3 * sizeof(WORD)); | |
| /* Jump to the interrupt handler */ | |
| context->SegCs = HIWORD(addr); | |
| context->Eip = LOWORD(addr); | |
| } | |
| return TRUE; | |
| case 0xcf: /* iret */ | |
| if (long_op) | |
| { | |
| DWORD *stack = get_stack( context ); | |
| context->Eip = *stack++; | |
| context->SegCs = *stack++; | |
| context->EFlags = *stack; | |
| add_stack(context, 3*sizeof(DWORD)); /* Pop the return address and flags */ | |
| } | |
| else | |
| { | |
| WORD *stack = get_stack( context ); | |
| context->Eip = *stack++; | |
| context->SegCs = *stack++; | |
| SET_LOWORD(context->EFlags,*stack); | |
| add_stack(context, 3*sizeof(WORD)); /* Pop the return address and flags */ | |
| } | |
| return TRUE; | |
| case 0xe4: /* inb al,XX */ | |
| SET_LOBYTE(context->Eax,INSTR_inport( instr[1], 1, context )); | |
| context->Eip += prefixlen + 2; | |
| return TRUE; | |
| case 0xe5: /* in (e)ax,XX */ | |
| if (long_op) | |
| context->Eax = INSTR_inport( instr[1], 4, context ); | |
| else | |
| SET_LOWORD(context->Eax, INSTR_inport( instr[1], 2, context )); | |
| context->Eip += prefixlen + 2; | |
| return TRUE; | |
| case 0xe6: /* outb XX,al */ | |
| INSTR_outport( instr[1], 1, LOBYTE(context->Eax), context ); | |
| context->Eip += prefixlen + 2; | |
| return TRUE; | |
| case 0xe7: /* out XX,(e)ax */ | |
| if (long_op) | |
| INSTR_outport( instr[1], 4, context->Eax, context ); | |
| else | |
| INSTR_outport( instr[1], 2, LOWORD(context->Eax), context ); | |
| context->Eip += prefixlen + 2; | |
| return TRUE; | |
| case 0xec: /* inb al,dx */ | |
| SET_LOBYTE(context->Eax, INSTR_inport( LOWORD(context->Edx), 1, context ) ); | |
| context->Eip += prefixlen + 1; | |
| return TRUE; | |
| case 0xed: /* in (e)ax,dx */ | |
| if (long_op) | |
| context->Eax = INSTR_inport( LOWORD(context->Edx), 4, context ); | |
| else | |
| SET_LOWORD(context->Eax, INSTR_inport( LOWORD(context->Edx), 2, context )); | |
| context->Eip += prefixlen + 1; | |
| return TRUE; | |
| case 0xee: /* outb dx,al */ | |
| INSTR_outport( LOWORD(context->Edx), 1, LOBYTE(context->Eax), context ); | |
| context->Eip += prefixlen + 1; | |
| return TRUE; | |
| case 0xef: /* out dx,(e)ax */ | |
| if (long_op) | |
| INSTR_outport( LOWORD(context->Edx), 4, context->Eax, context ); | |
| else | |
| INSTR_outport( LOWORD(context->Edx), 2, LOWORD(context->Eax), context ); | |
| context->Eip += prefixlen + 1; | |
| return TRUE; | |
| case 0xfa: /* cli, ignored */ | |
| context->Eip += prefixlen + 1; | |
| return TRUE; | |
| case 0xfb: /* sti, ignored */ | |
| context->Eip += prefixlen + 1; | |
| return TRUE; | |
| } | |
| /* Check for Win16 __GP handler */ | |
| gpHandler = HasGPHandler16( MAKESEGPTR( context->SegCs, context->Eip ) ); | |
| if (gpHandler) | |
| { | |
| WORD *stack = get_stack( context ); | |
| *--stack = context->SegCs; | |
| *--stack = context->Eip; | |
| add_stack(context, -2*sizeof(WORD)); | |
| context->SegCs = SELECTOROF( gpHandler ); | |
| context->Eip = OFFSETOF( gpHandler ); | |
| return TRUE; | |
| } | |
| return FALSE; /* Unable to emulate it */ | |
| } | |
| #endif /* __i386__ */ |