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/*
* 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) = DOSVM_dpmi_segments->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 != DOSVM_dpmi_segments->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 = DOSVM_dpmi_segments->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(PTR_REAL_TO_LIN(SELECTOROF(CurrRMCB->address),OFFSETOF(CurrRMCB->address)));
HeapFree(GetProcessHeap(), 0, CurrRMCB);
return 0;
}
return 1;
}
void WINAPI DPMI_FreeInternalRMCB( FARPROC16 proc )
{
DPMI_FreeRMCB( (DWORD)proc );
}
/**********************************************************************
* RawModeSwitch (WINEDOS.@)
*
* 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==DOSVM_dpmi_segments->dpmi_seg) {
/* This is the protected mode switch */
StartPM(context);
return;
}
else if (context->SegCs==DOSVM_dpmi_segments->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 );
}
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