/* * DPMI 0.9 emulation * * 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 "config.h" #include "wine/port.h" #include "windef.h" #include "wine/winbase16.h" #include "miscemu.h" #include "task.h" #include "msdos.h" #include "dosexe.h" #include "wine/debug.h" WINE_DEFAULT_DEBUG_CHANNEL(int31); /* Structure for real-mode callbacks */ typedef struct { DWORD edi; DWORD esi; DWORD ebp; DWORD reserved; DWORD ebx; DWORD edx; DWORD ecx; DWORD eax; WORD fl; WORD es; WORD ds; WORD fs; WORD gs; WORD ip; WORD cs; WORD sp; WORD ss; } REALMODECALL; typedef struct tagRMCB { DWORD address; DWORD proc_ofs,proc_sel; DWORD regs_ofs,regs_sel; struct tagRMCB *next; } RMCB; static RMCB *FirstRMCB = NULL; static WORD dpmi_flag; /********************************************************************** * INT_GetRealModeContext */ static void INT_GetRealModeContext( REALMODECALL *call, CONTEXT86 *context ) { context->Eax = call->eax; context->Ebx = call->ebx; context->Ecx = call->ecx; context->Edx = call->edx; context->Esi = call->esi; context->Edi = call->edi; context->Ebp = call->ebp; context->EFlags = call->fl | V86_FLAG; context->Eip = call->ip; context->Esp = call->sp; context->SegCs = call->cs; context->SegDs = call->ds; context->SegEs = call->es; context->SegFs = call->fs; context->SegGs = call->gs; context->SegSs = call->ss; } /********************************************************************** * INT_SetRealModeContext */ static void INT_SetRealModeContext( REALMODECALL *call, CONTEXT86 *context ) { call->eax = context->Eax; call->ebx = context->Ebx; call->ecx = context->Ecx; call->edx = context->Edx; call->esi = context->Esi; call->edi = context->Edi; call->ebp = context->Ebp; call->fl = LOWORD(context->EFlags); call->ip = LOWORD(context->Eip); call->sp = LOWORD(context->Esp); call->cs = context->SegCs; call->ds = context->SegDs; call->es = context->SegEs; call->fs = context->SegFs; call->gs = context->SegGs; call->ss = context->SegSs; } #ifdef __i386__ void DPMI_CallRMCB32(RMCB *rmcb, UINT16 ss, DWORD esp, UINT16*es, DWORD*edi) #if 0 /* original code, which early gccs puke on */ { int _clobber; __asm__ __volatile__( "pushl %%ebp\n" "pushl %%ebx\n" "pushl %%es\n" "pushl %%ds\n" "pushfl\n" "mov %7,%%es\n" "mov %5,%%ds\n" ".byte 0x36, 0xff, 0x18\n" /* lcall *%ss:(%eax) */ "popl %%ds\n" "mov %%es,%0\n" "popl %%es\n" "popl %%ebx\n" "popl %%ebp\n" : "=d" (*es), "=D" (*edi), "=S" (_clobber), "=a" (_clobber), "=c" (_clobber) : "0" (ss), "2" (esp), "4" (rmcb->regs_sel), "1" (rmcb->regs_ofs), "3" (&rmcb->proc_ofs) ); } #else /* code generated by a gcc new enough */ ; __ASM_GLOBAL_FUNC(DPMI_CallRMCB32, "pushl %ebp\n\t" "movl %esp,%ebp\n\t" "pushl %edi\n\t" "pushl %esi\n\t" "movl 0x8(%ebp),%eax\n\t" "movl 0x10(%ebp),%esi\n\t" "movl 0xc(%ebp),%edx\n\t" "movl 0x10(%eax),%ecx\n\t" "movl 0xc(%eax),%edi\n\t" "addl $0x4,%eax\n\t" "pushl %ebp\n\t" "pushl %ebx\n\t" "pushl %es\n\t" "pushl %ds\n\t" "pushfl\n\t" "mov %cx,%es\n\t" "mov %dx,%ds\n\t" ".byte 0x36, 0xff, 0x18\n\t" /* lcall *%ss:(%eax) */ "popl %ds\n\t" "mov %es,%dx\n\t" "popl %es\n\t" "popl %ebx\n\t" "popl %ebp\n\t" "movl 0x14(%ebp),%eax\n\t" "movw %dx,(%eax)\n\t" "movl 0x18(%ebp),%edx\n\t" "movl %edi,(%edx)\n\t" "popl %esi\n\t" "popl %edi\n\t" "leave\n\t" "ret") #endif #endif /* __i386__ */ /********************************************************************** * DPMI_CallRMCBProc * * This routine does the hard work of calling a callback procedure. */ static void DPMI_CallRMCBProc( CONTEXT86 *context, RMCB *rmcb, WORD flag ) { if (IS_SELECTOR_SYSTEM( rmcb->proc_sel )) { /* Wine-internal RMCB, call directly */ ((RMCBPROC)rmcb->proc_ofs)(context); } else { #ifdef __i386__ UINT16 ss,es; DWORD esp,edi; INT_SetRealModeContext(MapSL(MAKESEGPTR( rmcb->regs_sel, rmcb->regs_ofs )), context); ss = SELECTOR_AllocBlock( (void *)(context->SegSs<<4), 0x10000, WINE_LDT_FLAGS_DATA ); esp = context->Esp; FIXME("untested!\n"); /* The called proc ends with an IRET, and takes these parameters: * DS:ESI = pointer to real-mode SS:SP * ES:EDI = pointer to real-mode call structure * It returns: * ES:EDI = pointer to real-mode call structure (may be a copy) * It is the proc's responsibility to change the return CS:IP in the * real-mode call structure. */ if (flag & 1) { /* 32-bit DPMI client */ DPMI_CallRMCB32(rmcb, ss, esp, &es, &edi); } else { /* 16-bit DPMI client */ CONTEXT86 ctx = *context; ctx.SegCs = rmcb->proc_sel; ctx.Eip = rmcb->proc_ofs; ctx.SegDs = ss; ctx.Esi = esp; ctx.SegEs = rmcb->regs_sel; ctx.Edi = rmcb->regs_ofs; /* FIXME: I'm pretty sure this isn't right - should push flags first */ wine_call_to_16_regs_short(&ctx, 0); es = ctx.SegEs; edi = ctx.Edi; } FreeSelector16(ss); INT_GetRealModeContext( MapSL( MAKESEGPTR( es, edi )), context); #else ERR("RMCBs only implemented for i386\n"); #endif } } /********************************************************************** * DPMI_CallRMProc * * This routine does the hard work of calling a real mode procedure. */ int DPMI_CallRMProc( CONTEXT86 *context, LPWORD stack, int args, int iret ) { LPWORD stack16; LPVOID addr = NULL; /* avoid gcc warning */ RMCB *CurrRMCB; int alloc = 0, already = 0; BYTE *code; TRACE("EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n", context->Eax, context->Ebx, context->Ecx, context->Edx ); TRACE("ESI=%08lx EDI=%08lx ES=%04lx DS=%04lx CS:IP=%04lx:%04x, %d WORD arguments, %s\n", context->Esi, context->Edi, context->SegEs, context->SegDs, context->SegCs, LOWORD(context->Eip), args, iret?"IRET":"FAR" ); callrmproc_again: /* there might be some code that just jumps to RMCBs or the like, in which case following the jumps here might get us to a shortcut */ code = CTX_SEG_OFF_TO_LIN(context, context->SegCs, context->Eip); switch (*code) { case 0xe9: /* JMP NEAR */ context->Eip += 3 + *(WORD *)(code+1); /* yeah, I know these gotos don't look good... */ goto callrmproc_again; case 0xea: /* JMP FAR */ context->Eip = *(WORD *)(code+1); context->SegCs = *(WORD *)(code+3); /* ...but since the label is there anyway... */ goto callrmproc_again; case 0xeb: /* JMP SHORT */ context->Eip += 2 + *(signed char *)(code+1); /* ...because of other gotos below, so... */ goto callrmproc_again; } /* shortcut for chaining to internal interrupt handlers */ if ((context->SegCs == 0xF000) && iret) { DOSVM_RealModeInterrupt( LOWORD(context->Eip)/4, context); return 0; } /* shortcut for RMCBs */ CurrRMCB = FirstRMCB; while (CurrRMCB && (HIWORD(CurrRMCB->address) != context->SegCs)) CurrRMCB = CurrRMCB->next; if (!CurrRMCB && !MZ_Current()) { FIXME("DPMI real-mode call using DOS VM task system, not fully tested!\n"); TRACE("creating VM86 task\n"); MZ_AllocDPMITask(); } if (!already) { if (!context->SegSs) { alloc = 1; /* allocate default stack */ stack16 = addr = DOSMEM_GetBlock( 64, (UINT16 *)&(context->SegSs) ); context->Esp = 64-2; stack16 += 32-1; if (!addr) { ERR("could not allocate default stack\n"); return 1; } } else { stack16 = CTX_SEG_OFF_TO_LIN(context, context->SegSs, context->Esp); } context->Esp -= (args + (iret?1:0)) * sizeof(WORD); stack16 -= args; if (args) memcpy(stack16, stack, args*sizeof(WORD) ); /* push flags if iret */ if (iret) { stack16--; args++; *stack16 = LOWORD(context->EFlags); } /* push return address (return to interrupt wrapper) */ *(--stack16) = DOSMEM_wrap_seg; *(--stack16) = 0; /* adjust stack */ context->Esp -= 2*sizeof(WORD); already = 1; } if (CurrRMCB) { /* RMCB call, invoke protected-mode handler directly */ DPMI_CallRMCBProc(context, CurrRMCB, dpmi_flag); /* check if we returned to where we thought we would */ if ((context->SegCs != DOSMEM_wrap_seg) || (LOWORD(context->Eip) != 0)) { /* we need to continue at different address in real-mode space, so we need to set it all up for real mode again */ goto callrmproc_again; } } else { TRACE("entering real mode...\n"); DOSVM_Enter( context ); TRACE("returned from real-mode call\n"); } if (alloc) DOSMEM_FreeBlock( addr ); return 0; } /********************************************************************** * CallRMInt (WINEDOS.@) */ void WINAPI DOSVM_CallRMInt( CONTEXT86 *context ) { CONTEXT86 realmode_ctx; FARPROC16 rm_int = DOSVM_GetRMHandler( BL_reg(context) ); REALMODECALL *call = MapSL( MAKESEGPTR( context->SegEs, DI_reg(context) )); INT_GetRealModeContext( call, &realmode_ctx ); /* we need to check if a real-mode program has hooked the interrupt */ if (HIWORD(rm_int)!=0xF000) { /* yup, which means we need to switch to real mode... */ realmode_ctx.SegCs = HIWORD(rm_int); realmode_ctx.Eip = LOWORD(rm_int); if (DPMI_CallRMProc( &realmode_ctx, NULL, 0, TRUE)) SET_CFLAG(context); } else { RESET_CFLAG(context); /* use the IP we have instead of BL_reg, in case some apps decide to move interrupts around for whatever reason... */ DOSVM_RealModeInterrupt( LOWORD(rm_int)/4, &realmode_ctx ); } INT_SetRealModeContext( call, &realmode_ctx ); } /********************************************************************** * CallRMProc (WINEDOS.@) */ void WINAPI DOSVM_CallRMProc( CONTEXT86 *context, int iret ) { REALMODECALL *p = MapSL( MAKESEGPTR( context->SegEs, DI_reg(context) )); CONTEXT86 context16; TRACE("RealModeCall: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n", p->eax, p->ebx, p->ecx, p->edx); TRACE(" ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x, %d WORD arguments, %s\n", p->esi, p->edi, p->es, p->ds, p->cs, p->ip, CX_reg(context), iret?"IRET":"FAR" ); if (!(p->cs) && !(p->ip)) { /* remove this check if Int21/6501 case map function has been implemented */ SET_CFLAG(context); return; } INT_GetRealModeContext(p, &context16); DPMI_CallRMProc( &context16, ((LPWORD)MapSL(MAKESEGPTR(context->SegSs, LOWORD(context->Esp))))+3, CX_reg(context), iret ); INT_SetRealModeContext(p, &context16); } /* (see dosmem.c, function DOSMEM_InitDPMI) */ static void StartPM( CONTEXT86 *context ) { UINT16 cs, ss, ds, es; CONTEXT86 pm_ctx; DWORD psp_ofs = (DWORD)(DOSVM_psp<<4); PDB16 *psp = (PDB16 *)psp_ofs; HANDLE16 env_seg = psp->environment; unsigned char selflags = WINE_LDT_FLAGS_DATA; RESET_CFLAG(context); dpmi_flag = AX_reg(context); /* our mode switch wrapper have placed the desired CS into DX */ cs = SELECTOR_AllocBlock( (void *)(DX_reg(context)<<4), 0x10000, WINE_LDT_FLAGS_CODE ); /* due to a flaw in some CPUs (at least mine), it is best to mark stack segments as 32-bit if they can be used in 32-bit code. Otherwise, these CPUs may not set the high word of esp during a ring transition (from kernel code) to the 16-bit stack, and this causes trouble if executing 32-bit code using this stack. */ if (dpmi_flag & 1) selflags |= WINE_LDT_FLAGS_32BIT; ss = SELECTOR_AllocBlock( (void *)(context->SegSs<<4), 0x10000, selflags ); /* do the same for the data segments, just in case */ if (context->SegDs == context->SegSs) ds = ss; else ds = SELECTOR_AllocBlock( (void *)(context->SegDs<<4), 0x10000, selflags ); es = SELECTOR_AllocBlock( psp, 0x100, selflags ); /* convert environment pointer, as the spec says, but we're a bit lazy about the size here... */ psp->environment = SELECTOR_AllocBlock( (void *)(env_seg<<4), 0x10000, WINE_LDT_FLAGS_DATA ); pm_ctx = *context; pm_ctx.SegCs = DOSMEM_dpmi_sel; /* our mode switch wrapper expects the new CS in DX, and the new SS in AX */ pm_ctx.Eax = ss; pm_ctx.Edx = cs; pm_ctx.SegDs = ds; pm_ctx.SegEs = es; pm_ctx.SegFs = 0; pm_ctx.SegGs = 0; TRACE("DOS program is now entering protected mode\n"); wine_call_to_16_regs_short(&pm_ctx, 0); /* in the current state of affairs, we won't ever actually return here... */ /* we should have int21/ah=4c do it someday, though... */ FreeSelector16(psp->environment); psp->environment = env_seg; FreeSelector16(es); if (ds != ss) FreeSelector16(ds); FreeSelector16(ss); FreeSelector16(cs); } static RMCB *DPMI_AllocRMCB( void ) { RMCB *NewRMCB = HeapAlloc(GetProcessHeap(), 0, sizeof(RMCB)); UINT16 uParagraph; if (NewRMCB) { LPVOID RMCBmem = DOSMEM_GetBlock(4, &uParagraph); LPBYTE p = RMCBmem; *p++ = 0xcd; /* RMCB: */ *p++ = 0x31; /* int $0x31 */ /* it is the called procedure's task to change the return CS:EIP the DPMI 0.9 spec states that if it doesn't, it will be called again */ *p++ = 0xeb; *p++ = 0xfc; /* jmp RMCB */ NewRMCB->address = MAKELONG(0, uParagraph); NewRMCB->next = FirstRMCB; FirstRMCB = NewRMCB; } return NewRMCB; } 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 */ #if 0 void WINAPI DPMI_RawModeSwitch( SIGCONTEXT *context ) { LPDOSTASK lpDosTask = MZ_Current(); CONTEXT86 rm_ctx; int ret; if (!lpDosTask) { /* we could probably start a DPMI-only dosmod task here, but I doubt anything other than real DOS apps want to call raw mode switch */ ERR("attempting raw mode switch without DOS task!\n"); ExitProcess(1); } /* initialize real-mode context as per spec */ memset(&rm_ctx, 0, sizeof(rm_ctx)); rm_ctx.SegDs = AX_sig(context); rm_ctx.SegEs = CX_sig(context); rm_ctx.SegSs = DX_sig(context); rm_ctx.Esp = EBX_sig(context); rm_ctx.SegCs = SI_sig(context); rm_ctx.Eip = EDI_sig(context); rm_ctx.Ebp = EBP_sig(context); rm_ctx.SegFs = 0; rm_ctx.SegGs = 0; rm_ctx.EFlags = EFL_sig(context); /* 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) { /* if the sync was lost, there's no way to recover */ ExitProcess(1); } /* alter protected-mode context as per spec */ DS_sig(context) = LOWORD(rm_ctx.Eax); ES_sig(context) = LOWORD(rm_ctx.Ecx); SS_sig(context) = LOWORD(rm_ctx.Edx); ESP_sig(context) = rm_ctx.Ebx; CS_sig(context) = LOWORD(rm_ctx.Esi); EIP_sig(context) = rm_ctx.Edi; EBP_sig(context) = rm_ctx.Ebp; FS_sig(context) = 0; GS_sig(context) = 0; /* Return to new address and hope that we didn't mess up */ TRACE("re-entering protected mode at %04x:%08lx\n", CS_sig(context), EIP_sig(context)); } #endif /********************************************************************** * 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 ); }