642 lines
19 KiB
C
642 lines
19 KiB
C
/*
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* DPMI 0.9 emulation
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*
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* Copyright 1995 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include "wine/port.h"
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#include "windef.h"
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#include "wine/winbase16.h"
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#include "miscemu.h"
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#include "task.h"
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#include "msdos.h"
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#include "dosexe.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(int31);
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/* Structure for real-mode callbacks */
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typedef struct
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{
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DWORD edi;
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DWORD esi;
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DWORD ebp;
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DWORD reserved;
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DWORD ebx;
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DWORD edx;
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DWORD ecx;
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DWORD eax;
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WORD fl;
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WORD es;
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WORD ds;
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WORD fs;
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WORD gs;
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WORD ip;
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WORD cs;
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WORD sp;
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WORD ss;
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} REALMODECALL;
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typedef struct tagRMCB {
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DWORD address;
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DWORD proc_ofs,proc_sel;
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DWORD regs_ofs,regs_sel;
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struct tagRMCB *next;
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} RMCB;
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static RMCB *FirstRMCB = NULL;
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static WORD dpmi_flag;
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/**********************************************************************
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* INT_GetRealModeContext
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*/
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static void INT_GetRealModeContext( REALMODECALL *call, CONTEXT86 *context )
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{
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context->Eax = call->eax;
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context->Ebx = call->ebx;
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context->Ecx = call->ecx;
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context->Edx = call->edx;
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context->Esi = call->esi;
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context->Edi = call->edi;
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context->Ebp = call->ebp;
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context->EFlags = call->fl | V86_FLAG;
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context->Eip = call->ip;
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context->Esp = call->sp;
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context->SegCs = call->cs;
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context->SegDs = call->ds;
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context->SegEs = call->es;
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context->SegFs = call->fs;
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context->SegGs = call->gs;
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context->SegSs = call->ss;
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}
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/**********************************************************************
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* INT_SetRealModeContext
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*/
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static void INT_SetRealModeContext( REALMODECALL *call, CONTEXT86 *context )
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{
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call->eax = context->Eax;
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call->ebx = context->Ebx;
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call->ecx = context->Ecx;
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call->edx = context->Edx;
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call->esi = context->Esi;
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call->edi = context->Edi;
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call->ebp = context->Ebp;
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call->fl = LOWORD(context->EFlags);
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call->ip = LOWORD(context->Eip);
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call->sp = LOWORD(context->Esp);
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call->cs = context->SegCs;
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call->ds = context->SegDs;
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call->es = context->SegEs;
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call->fs = context->SegFs;
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call->gs = context->SegGs;
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call->ss = context->SegSs;
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}
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#ifdef __i386__
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void DPMI_CallRMCB32(RMCB *rmcb, UINT16 ss, DWORD esp, UINT16*es, DWORD*edi)
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#if 0 /* original code, which early gccs puke on */
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{
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int _clobber;
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__asm__ __volatile__(
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"pushl %%ebp\n"
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"pushl %%ebx\n"
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"pushl %%es\n"
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"pushl %%ds\n"
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"pushfl\n"
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"mov %7,%%es\n"
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"mov %5,%%ds\n"
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".byte 0x36, 0xff, 0x18\n" /* lcall *%ss:(%eax) */
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"popl %%ds\n"
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"mov %%es,%0\n"
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"popl %%es\n"
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"popl %%ebx\n"
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"popl %%ebp\n"
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: "=d" (*es), "=D" (*edi), "=S" (_clobber), "=a" (_clobber), "=c" (_clobber)
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: "0" (ss), "2" (esp),
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"4" (rmcb->regs_sel), "1" (rmcb->regs_ofs),
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"3" (&rmcb->proc_ofs) );
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}
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#else /* code generated by a gcc new enough */
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;
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__ASM_GLOBAL_FUNC(DPMI_CallRMCB32,
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"pushl %ebp\n\t"
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"movl %esp,%ebp\n\t"
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"pushl %edi\n\t"
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"pushl %esi\n\t"
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"movl 0x8(%ebp),%eax\n\t"
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"movl 0x10(%ebp),%esi\n\t"
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"movl 0xc(%ebp),%edx\n\t"
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"movl 0x10(%eax),%ecx\n\t"
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"movl 0xc(%eax),%edi\n\t"
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"addl $0x4,%eax\n\t"
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"pushl %ebp\n\t"
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"pushl %ebx\n\t"
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"pushl %es\n\t"
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"pushl %ds\n\t"
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"pushfl\n\t"
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"mov %cx,%es\n\t"
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"mov %dx,%ds\n\t"
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".byte 0x36, 0xff, 0x18\n\t" /* lcall *%ss:(%eax) */
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"popl %ds\n\t"
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"mov %es,%dx\n\t"
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"popl %es\n\t"
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"popl %ebx\n\t"
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"popl %ebp\n\t"
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"movl 0x14(%ebp),%eax\n\t"
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"movw %dx,(%eax)\n\t"
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"movl 0x18(%ebp),%edx\n\t"
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"movl %edi,(%edx)\n\t"
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"popl %esi\n\t"
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"popl %edi\n\t"
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"leave\n\t"
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"ret")
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#endif
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#endif /* __i386__ */
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/**********************************************************************
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* DPMI_CallRMCBProc
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*
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* This routine does the hard work of calling a callback procedure.
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*/
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static void DPMI_CallRMCBProc( CONTEXT86 *context, RMCB *rmcb, WORD flag )
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{
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if (IS_SELECTOR_SYSTEM( rmcb->proc_sel )) {
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/* Wine-internal RMCB, call directly */
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((RMCBPROC)rmcb->proc_ofs)(context);
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} else {
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#ifdef __i386__
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UINT16 ss,es;
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DWORD esp,edi;
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INT_SetRealModeContext(MapSL(MAKESEGPTR( rmcb->regs_sel, rmcb->regs_ofs )), context);
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ss = SELECTOR_AllocBlock( (void *)(context->SegSs<<4), 0x10000, WINE_LDT_FLAGS_DATA );
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esp = context->Esp;
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FIXME("untested!\n");
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/* The called proc ends with an IRET, and takes these parameters:
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* DS:ESI = pointer to real-mode SS:SP
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* ES:EDI = pointer to real-mode call structure
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* It returns:
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* ES:EDI = pointer to real-mode call structure (may be a copy)
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* It is the proc's responsibility to change the return CS:IP in the
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* real-mode call structure. */
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if (flag & 1) {
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/* 32-bit DPMI client */
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DPMI_CallRMCB32(rmcb, ss, esp, &es, &edi);
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} else {
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/* 16-bit DPMI client */
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CONTEXT86 ctx = *context;
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ctx.SegCs = rmcb->proc_sel;
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ctx.Eip = rmcb->proc_ofs;
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ctx.SegDs = ss;
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ctx.Esi = esp;
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ctx.SegEs = rmcb->regs_sel;
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ctx.Edi = rmcb->regs_ofs;
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/* FIXME: I'm pretty sure this isn't right - should push flags first */
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wine_call_to_16_regs_short(&ctx, 0);
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es = ctx.SegEs;
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edi = ctx.Edi;
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}
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FreeSelector16(ss);
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INT_GetRealModeContext( MapSL( MAKESEGPTR( es, edi )), context);
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#else
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ERR("RMCBs only implemented for i386\n");
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#endif
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}
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}
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/**********************************************************************
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* DPMI_CallRMProc
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*
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* This routine does the hard work of calling a real mode procedure.
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*/
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int DPMI_CallRMProc( CONTEXT86 *context, LPWORD stack, int args, int iret )
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{
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LPWORD stack16;
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LPVOID addr = NULL; /* avoid gcc warning */
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RMCB *CurrRMCB;
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int alloc = 0, already = 0;
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BYTE *code;
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TRACE("EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
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context->Eax, context->Ebx, context->Ecx, context->Edx );
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TRACE("ESI=%08lx EDI=%08lx ES=%04lx DS=%04lx CS:IP=%04lx:%04x, %d WORD arguments, %s\n",
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context->Esi, context->Edi, context->SegEs, context->SegDs,
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context->SegCs, LOWORD(context->Eip), args, iret?"IRET":"FAR" );
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callrmproc_again:
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/* there might be some code that just jumps to RMCBs or the like,
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in which case following the jumps here might get us to a shortcut */
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code = CTX_SEG_OFF_TO_LIN(context, context->SegCs, context->Eip);
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switch (*code) {
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case 0xe9: /* JMP NEAR */
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context->Eip += 3 + *(WORD *)(code+1);
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/* yeah, I know these gotos don't look good... */
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goto callrmproc_again;
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case 0xea: /* JMP FAR */
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context->Eip = *(WORD *)(code+1);
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context->SegCs = *(WORD *)(code+3);
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/* ...but since the label is there anyway... */
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goto callrmproc_again;
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case 0xeb: /* JMP SHORT */
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context->Eip += 2 + *(signed char *)(code+1);
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/* ...because of other gotos below, so... */
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goto callrmproc_again;
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}
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/* shortcut for chaining to internal interrupt handlers */
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if ((context->SegCs == 0xF000) && iret)
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{
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DOSVM_RealModeInterrupt( LOWORD(context->Eip)/4, context);
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return 0;
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}
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/* shortcut for RMCBs */
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CurrRMCB = FirstRMCB;
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while (CurrRMCB && (HIWORD(CurrRMCB->address) != context->SegCs))
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CurrRMCB = CurrRMCB->next;
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if (!CurrRMCB && !MZ_Current())
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{
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FIXME("DPMI real-mode call using DOS VM task system, not fully tested!\n");
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TRACE("creating VM86 task\n");
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MZ_AllocDPMITask();
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}
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if (!already) {
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if (!context->SegSs) {
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alloc = 1; /* allocate default stack */
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stack16 = addr = DOSMEM_GetBlock( 64, (UINT16 *)&(context->SegSs) );
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context->Esp = 64-2;
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stack16 += 32-1;
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if (!addr) {
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ERR("could not allocate default stack\n");
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return 1;
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}
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} else {
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stack16 = CTX_SEG_OFF_TO_LIN(context, context->SegSs, context->Esp);
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}
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context->Esp -= (args + (iret?1:0)) * sizeof(WORD);
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stack16 -= args;
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if (args) memcpy(stack16, stack, args*sizeof(WORD) );
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/* push flags if iret */
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if (iret) {
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stack16--; args++;
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*stack16 = LOWORD(context->EFlags);
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}
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/* push return address (return to interrupt wrapper) */
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*(--stack16) = DOSMEM_wrap_seg;
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*(--stack16) = 0;
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/* adjust stack */
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context->Esp -= 2*sizeof(WORD);
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already = 1;
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}
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if (CurrRMCB) {
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/* RMCB call, invoke protected-mode handler directly */
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DPMI_CallRMCBProc(context, CurrRMCB, dpmi_flag);
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/* check if we returned to where we thought we would */
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if ((context->SegCs != DOSMEM_wrap_seg) ||
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(LOWORD(context->Eip) != 0)) {
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/* we need to continue at different address in real-mode space,
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so we need to set it all up for real mode again */
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goto callrmproc_again;
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}
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} else {
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TRACE("entering real mode...\n");
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DOSVM_Enter( context );
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TRACE("returned from real-mode call\n");
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}
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if (alloc) DOSMEM_FreeBlock( addr );
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return 0;
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}
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/**********************************************************************
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* CallRMInt (WINEDOS.@)
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*/
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void WINAPI DOSVM_CallRMInt( CONTEXT86 *context )
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{
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CONTEXT86 realmode_ctx;
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FARPROC16 rm_int = DOSVM_GetRMHandler( BL_reg(context) );
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REALMODECALL *call = MapSL( MAKESEGPTR( context->SegEs, DI_reg(context) ));
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INT_GetRealModeContext( call, &realmode_ctx );
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/* we need to check if a real-mode program has hooked the interrupt */
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if (HIWORD(rm_int)!=0xF000) {
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/* yup, which means we need to switch to real mode... */
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realmode_ctx.SegCs = HIWORD(rm_int);
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realmode_ctx.Eip = LOWORD(rm_int);
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if (DPMI_CallRMProc( &realmode_ctx, NULL, 0, TRUE))
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SET_CFLAG(context);
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} else {
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RESET_CFLAG(context);
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/* use the IP we have instead of BL_reg, in case some apps
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decide to move interrupts around for whatever reason... */
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DOSVM_RealModeInterrupt( LOWORD(rm_int)/4, &realmode_ctx );
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}
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INT_SetRealModeContext( call, &realmode_ctx );
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}
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/**********************************************************************
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* CallRMProc (WINEDOS.@)
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*/
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void WINAPI DOSVM_CallRMProc( CONTEXT86 *context, int iret )
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{
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REALMODECALL *p = MapSL( MAKESEGPTR( context->SegEs, DI_reg(context) ));
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CONTEXT86 context16;
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TRACE("RealModeCall: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
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p->eax, p->ebx, p->ecx, p->edx);
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TRACE(" ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x, %d WORD arguments, %s\n",
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p->esi, p->edi, p->es, p->ds, p->cs, p->ip, CX_reg(context), iret?"IRET":"FAR" );
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if (!(p->cs) && !(p->ip)) { /* remove this check
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if Int21/6501 case map function
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has been implemented */
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SET_CFLAG(context);
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return;
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}
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INT_GetRealModeContext(p, &context16);
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DPMI_CallRMProc( &context16, ((LPWORD)MapSL(MAKESEGPTR(context->SegSs, LOWORD(context->Esp))))+3,
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CX_reg(context), iret );
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INT_SetRealModeContext(p, &context16);
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}
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/* (see dosmem.c, function DOSMEM_InitDPMI) */
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static void StartPM( CONTEXT86 *context )
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{
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UINT16 cs, ss, ds, es;
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CONTEXT86 pm_ctx;
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DWORD psp_ofs = (DWORD)(DOSVM_psp<<4);
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PDB16 *psp = (PDB16 *)psp_ofs;
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HANDLE16 env_seg = psp->environment;
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unsigned char selflags = WINE_LDT_FLAGS_DATA;
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RESET_CFLAG(context);
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dpmi_flag = AX_reg(context);
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/* our mode switch wrapper have placed the desired CS into DX */
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cs = SELECTOR_AllocBlock( (void *)(DX_reg(context)<<4), 0x10000, WINE_LDT_FLAGS_CODE );
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/* due to a flaw in some CPUs (at least mine), it is best to mark stack segments as 32-bit if they
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can be used in 32-bit code. Otherwise, these CPUs may not set the high word of esp during a
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ring transition (from kernel code) to the 16-bit stack, and this causes trouble if executing
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32-bit code using this stack. */
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if (dpmi_flag & 1) selflags |= WINE_LDT_FLAGS_32BIT;
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ss = SELECTOR_AllocBlock( (void *)(context->SegSs<<4), 0x10000, selflags );
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/* do the same for the data segments, just in case */
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if (context->SegDs == context->SegSs) ds = ss;
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else ds = SELECTOR_AllocBlock( (void *)(context->SegDs<<4), 0x10000, selflags );
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es = SELECTOR_AllocBlock( psp, 0x100, selflags );
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/* convert environment pointer, as the spec says, but we're a bit lazy about the size here... */
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psp->environment = SELECTOR_AllocBlock( (void *)(env_seg<<4), 0x10000, WINE_LDT_FLAGS_DATA );
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pm_ctx = *context;
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pm_ctx.SegCs = DOSMEM_dpmi_sel;
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/* our mode switch wrapper expects the new CS in DX, and the new SS in AX */
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pm_ctx.Eax = ss;
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pm_ctx.Edx = cs;
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pm_ctx.SegDs = ds;
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pm_ctx.SegEs = es;
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pm_ctx.SegFs = 0;
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pm_ctx.SegGs = 0;
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TRACE("DOS program is now entering protected mode\n");
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wine_call_to_16_regs_short(&pm_ctx, 0);
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/* in the current state of affairs, we won't ever actually return here... */
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/* we should have int21/ah=4c do it someday, though... */
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FreeSelector16(psp->environment);
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psp->environment = env_seg;
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FreeSelector16(es);
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if (ds != ss) FreeSelector16(ds);
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FreeSelector16(ss);
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FreeSelector16(cs);
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}
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static RMCB *DPMI_AllocRMCB( void )
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{
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RMCB *NewRMCB = HeapAlloc(GetProcessHeap(), 0, sizeof(RMCB));
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UINT16 uParagraph;
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if (NewRMCB)
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{
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LPVOID RMCBmem = DOSMEM_GetBlock(4, &uParagraph);
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LPBYTE p = RMCBmem;
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*p++ = 0xcd; /* RMCB: */
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*p++ = 0x31; /* int $0x31 */
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/* it is the called procedure's task to change the return CS:EIP
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the DPMI 0.9 spec states that if it doesn't, it will be called again */
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*p++ = 0xeb;
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*p++ = 0xfc; /* jmp RMCB */
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NewRMCB->address = MAKELONG(0, uParagraph);
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NewRMCB->next = FirstRMCB;
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FirstRMCB = NewRMCB;
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}
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return NewRMCB;
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}
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FARPROC16 WINAPI DPMI_AllocInternalRMCB( RMCBPROC proc )
|
|
{
|
|
RMCB *NewRMCB = DPMI_AllocRMCB();
|
|
|
|
if (NewRMCB) {
|
|
NewRMCB->proc_ofs = (DWORD)proc;
|
|
NewRMCB->proc_sel = 0;
|
|
NewRMCB->regs_ofs = 0;
|
|
NewRMCB->regs_sel = 0;
|
|
return (FARPROC16)(NewRMCB->address);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static int DPMI_FreeRMCB( DWORD address )
|
|
{
|
|
RMCB *CurrRMCB = FirstRMCB;
|
|
RMCB *PrevRMCB = NULL;
|
|
|
|
while (CurrRMCB && (CurrRMCB->address != address))
|
|
{
|
|
PrevRMCB = CurrRMCB;
|
|
CurrRMCB = CurrRMCB->next;
|
|
}
|
|
if (CurrRMCB)
|
|
{
|
|
if (PrevRMCB)
|
|
PrevRMCB->next = CurrRMCB->next;
|
|
else
|
|
FirstRMCB = CurrRMCB->next;
|
|
DOSMEM_FreeBlock(DOSMEM_MapRealToLinear(CurrRMCB->address));
|
|
HeapFree(GetProcessHeap(), 0, CurrRMCB);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
void WINAPI DPMI_FreeInternalRMCB( FARPROC16 proc )
|
|
{
|
|
DPMI_FreeRMCB( (DWORD)proc );
|
|
}
|
|
|
|
|
|
/* DPMI Raw Mode Switch handler */
|
|
|
|
void WINAPI DOSVM_RawModeSwitch( CONTEXT86 *context )
|
|
{
|
|
CONTEXT86 rm_ctx;
|
|
int ret;
|
|
|
|
/* initialize real-mode context as per spec */
|
|
memset(&rm_ctx, 0, sizeof(rm_ctx));
|
|
rm_ctx.SegDs = AX_reg(context);
|
|
rm_ctx.SegEs = CX_reg(context);
|
|
rm_ctx.SegSs = DX_reg(context);
|
|
rm_ctx.Esp = context->Ebx;
|
|
rm_ctx.SegCs = SI_reg(context);
|
|
rm_ctx.Eip = context->Edi;
|
|
rm_ctx.Ebp = context->Ebp;
|
|
rm_ctx.SegFs = 0;
|
|
rm_ctx.SegGs = 0;
|
|
rm_ctx.EFlags = context->EFlags; /* at least we need the IF flag */
|
|
|
|
/* enter real mode again */
|
|
TRACE("re-entering real mode at %04lx:%04lx\n",rm_ctx.SegCs,rm_ctx.Eip);
|
|
ret = DOSVM_Enter( &rm_ctx );
|
|
/* when the real-mode stuff call its mode switch address,
|
|
DOSVM_Enter will return and we will continue here */
|
|
|
|
if (ret<0) {
|
|
ERR("Sync lost!\n");
|
|
/* if the sync was lost, there's no way to recover */
|
|
ExitProcess(1);
|
|
}
|
|
|
|
/* alter protected-mode context as per spec */
|
|
context->SegDs = LOWORD(rm_ctx.Eax);
|
|
context->SegEs = LOWORD(rm_ctx.Ecx);
|
|
context->SegSs = LOWORD(rm_ctx.Edx);
|
|
context->Esp = rm_ctx.Ebx;
|
|
context->SegCs = LOWORD(rm_ctx.Esi);
|
|
context->Eip = rm_ctx.Edi;
|
|
context->Ebp = rm_ctx.Ebp;
|
|
context->SegFs = 0;
|
|
context->SegGs = 0;
|
|
|
|
/* Return to new address and hope that we didn't mess up */
|
|
TRACE("re-entering protected mode at %04lx:%08lx\n",
|
|
context->SegCs, context->Eip);
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* AllocRMCB (WINEDOS.@)
|
|
*/
|
|
void WINAPI DOSVM_AllocRMCB( CONTEXT86 *context )
|
|
{
|
|
RMCB *NewRMCB = DPMI_AllocRMCB();
|
|
|
|
TRACE("Function to call: %04x:%04x\n", (WORD)context->SegDs, SI_reg(context) );
|
|
|
|
if (NewRMCB)
|
|
{
|
|
/* FIXME: if 32-bit DPMI client, use ESI and EDI */
|
|
NewRMCB->proc_ofs = LOWORD(context->Esi);
|
|
NewRMCB->proc_sel = context->SegDs;
|
|
NewRMCB->regs_ofs = LOWORD(context->Edi);
|
|
NewRMCB->regs_sel = context->SegEs;
|
|
SET_LOWORD( context->Ecx, HIWORD(NewRMCB->address) );
|
|
SET_LOWORD( context->Edx, LOWORD(NewRMCB->address) );
|
|
}
|
|
else
|
|
{
|
|
SET_LOWORD( context->Eax, 0x8015 ); /* callback unavailable */
|
|
SET_CFLAG(context);
|
|
}
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* FreeRMCB (WINEDOS.@)
|
|
*/
|
|
void WINAPI DOSVM_FreeRMCB( CONTEXT86 *context )
|
|
{
|
|
FIXME("callback address: %04x:%04x\n",
|
|
CX_reg(context), DX_reg(context));
|
|
|
|
if (DPMI_FreeRMCB(MAKELONG(DX_reg(context), CX_reg(context)))) {
|
|
SET_LOWORD( context->Eax, 0x8024 ); /* invalid callback address */
|
|
SET_CFLAG(context);
|
|
}
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* DOSVM_Int31Handler
|
|
*
|
|
* Handler for real-mode int 31h (DPMI).
|
|
*/
|
|
void WINAPI DOSVM_Int31Handler( CONTEXT86 *context )
|
|
{
|
|
/* check if it's our wrapper */
|
|
TRACE("called from real mode\n");
|
|
if (context->SegCs==DOSMEM_dpmi_seg) {
|
|
/* This is the protected mode switch */
|
|
StartPM(context);
|
|
return;
|
|
}
|
|
else if (context->SegCs==DOSMEM_xms_seg)
|
|
{
|
|
/* This is the XMS driver entry point */
|
|
XMS_Handler(context);
|
|
return;
|
|
}
|
|
else
|
|
{
|
|
/* Check for RMCB */
|
|
RMCB *CurrRMCB = FirstRMCB;
|
|
|
|
while (CurrRMCB && (HIWORD(CurrRMCB->address) != context->SegCs))
|
|
CurrRMCB = CurrRMCB->next;
|
|
|
|
if (CurrRMCB) {
|
|
/* RMCB call, propagate to protected-mode handler */
|
|
DPMI_CallRMCBProc(context, CurrRMCB, dpmi_flag);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* chain to protected mode handler */
|
|
INT_Int31Handler( context );
|
|
}
|