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Extended __wine_enter_vm86 to handle pending interrupts.

This commit is contained in:
Ove Kaaven 2001-06-21 00:39:34 +00:00 committed by Alexandre Julliard
parent ee8ab7af8a
commit 6e33f63e4a
2 changed files with 123 additions and 3 deletions
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120
dlls/ntdll/signal_i386.c
View File

@ -773,6 +773,62 @@ static void do_fpe( CONTEXT *context, int trap_code )
}
/**********************************************************************
* set_vm86_pend
*
* Handler for SIGUSR2, which we use to set the vm86 pending flag.
*/
static void set_vm86_pend( CONTEXT *context )
{
EXCEPTION_RECORD rec;
TEB *teb = NtCurrentTeb();
rec.ExceptionCode = EXCEPTION_VM86_STI;
rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
rec.ExceptionRecord = NULL;
rec.NumberParameters = 1;
rec.ExceptionInformation[0] = 0;
/* __wine_enter_vm86() merges the vm86_pending flag in safely */
teb->vm86_pending |= VIP_MASK;
/* see if we were in VM86 mode */
if (context->EFlags & 0x00020000)
{
/* seems so, also set flag in signal context */
if (context->EFlags & VIP_MASK) return;
context->EFlags |= VIP_MASK;
if (context->EFlags & VIF_MASK) {
/* VIF is set, throw exception */
teb->vm86_pending = 0;
rec.ExceptionAddress = (LPVOID)context->Eip;
EXC_RtlRaiseException( &rec, context );
}
}
#ifdef linux
else if (teb->vm86_ptr)
{
/* not in VM86, but possibly setting up for it */
struct vm86plus_struct *vm86 = (struct vm86plus_struct*)(teb->vm86_ptr);
if (vm86->regs.eflags & VIP_MASK) return;
vm86->regs.eflags |= VIP_MASK;
if (vm86->regs.eflags & VIF_MASK) {
/* VIF is set, throw exception */
CONTEXT vcontext;
teb->vm86_pending = 0;
save_vm86_context( &vcontext, vm86 );
rec.ExceptionAddress = (LPVOID)vcontext.Eip;
EXC_RtlRaiseException( &rec, &vcontext );
restore_vm86_context( &vcontext, vm86 );
if (teb->vm86_ctx) {
/* must also save here */
*(CONTEXT*)(teb->vm86_ctx) = vcontext;
}
}
}
#endif /* linux */
}
/**********************************************************************
* segv_handler
*
@ -839,6 +895,41 @@ static HANDLER_DEF(int_handler)
}
/**********************************************************************
* alrm_handler
*
* Handler for SIGALRM.
* Increases the alarm counter and sets the vm86 pending flag.
*/
static HANDLER_DEF(alrm_handler)
{
CONTEXT context;
save_context( &context, HANDLER_CONTEXT );
NtCurrentTeb()->alarms++;
set_vm86_pend( &context );
restore_context( &context, HANDLER_CONTEXT );
}
/**********************************************************************
* usr2_handler
*
* Handler for SIGUSR2.
* We use it to signal that the running __wine_enter_vm86() should
* immediately set VIP_MASK, causing pending events to be handled
* as early as possible.
*/
static HANDLER_DEF(usr2_handler)
{
CONTEXT context;
save_context( &context, HANDLER_CONTEXT );
set_vm86_pend( &context );
restore_context( &context, HANDLER_CONTEXT );
}
/***********************************************************************
* set_handler
*
@ -919,6 +1010,8 @@ BOOL SIGNAL_Init(void)
#ifdef SIGTRAP
if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
#endif
if (set_handler( SIGALRM, have_sigaltstack, (void (*)())alrm_handler ) == -1) goto error;
if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
return TRUE;
error:
@ -936,6 +1029,7 @@ BOOL SIGNAL_Init(void)
void __wine_enter_vm86( CONTEXT *context )
{
EXCEPTION_RECORD rec;
TEB *teb = NtCurrentTeb();
int res;
struct vm86plus_struct vm86;
@ -943,6 +1037,22 @@ void __wine_enter_vm86( CONTEXT *context )
for (;;)
{
restore_vm86_context( context, &vm86 );
/* Linux doesn't preserve pending flag (VIP_MASK) on return,
* so save it on entry, just in case */
teb->vm86_pending |= (context->EFlags & VIP_MASK);
/* Work around race conditions with signal handler
* (avoiding sigprocmask for performance reasons) */
teb->vm86_ptr = &vm86;
vm86.regs.eflags |= teb->vm86_pending;
/* Check for VIF|VIP here, since vm86_enter doesn't */
if ((vm86.regs.eflags & (VIF_MASK|VIP_MASK)) == (VIF_MASK|VIP_MASK)) {
teb->vm86_ptr = NULL;
teb->vm86_pending = 0;
context->EFlags |= VIP_MASK;
rec.ExceptionCode = EXCEPTION_VM86_STI;
rec.ExceptionInformation[0] = 0;
goto cancel_vm86;
}
do
{
@ -954,7 +1064,11 @@ void __wine_enter_vm86( CONTEXT *context )
}
} while (VM86_TYPE(res) == VM86_SIGNAL);
teb->vm86_ctx = context;
save_vm86_context( context, &vm86 );
teb->vm86_ptr = NULL;
teb->vm86_ctx = NULL;
context->EFlags |= teb->vm86_pending;
switch(VM86_TYPE(res))
{
@ -962,12 +1076,13 @@ void __wine_enter_vm86( CONTEXT *context )
do_segv( context, T_PROTFLT, 0, 0 );
continue;
case VM86_TRAP: /* return due to DOS-debugger request */
do_trap( context, VM86_ARG(res) );
do_trap( context, VM86_ARG(res) );
continue;
case VM86_INTx: /* int3/int x instruction (ARG = x) */
rec.ExceptionCode = EXCEPTION_VM86_INTx;
break;
case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
teb->vm86_pending = 0;
rec.ExceptionCode = EXCEPTION_VM86_STI;
break;
case VM86_PICRETURN: /* return due to pending PIC request */
@ -977,11 +1092,12 @@ void __wine_enter_vm86( CONTEXT *context )
ERR( "unhandled result from vm86 mode %x\n", res );
continue;
}
rec.ExceptionInformation[0] = VM86_ARG(res);
cancel_vm86:
rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
rec.ExceptionRecord = NULL;
rec.ExceptionAddress = (LPVOID)context->Eip;
rec.NumberParameters = 1;
rec.ExceptionInformation[0] = VM86_ARG(res);
EXC_RtlRaiseException( &rec, context );
}
}

6
include/thread.h
View File

@ -102,10 +102,14 @@ typedef struct _TEB
void *pthread_data; /* --3 220 Data for pthread emulation */
struct async_private *pending_list; /* --3 224 list of pending async operations */
void *driver_data; /* --3 228 Graphics driver private data */
DWORD alarms; /* --3 22c Data for vm86 mode */
DWORD vm86_pending; /* --3 230 Data for vm86 mode */
void *vm86_ptr; /* --3 234 Data for vm86 mode */
void *vm86_ctx; /* --3 238 Data for vm86 mode */
/* here is plenty space for wine specific fields (don't forget to change pad6!!) */
/* the following are nt specific fields */
DWORD pad6[627]; /* --n 22c */
DWORD pad6[623]; /* --n 23c */
UNICODE_STRING StaticUnicodeString; /* -2- bf8 used by advapi32 */
USHORT StaticUnicodeBuffer[261]; /* -2- c00 used by advapi32 */
DWORD pad7; /* --n e0c */