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Added preliminary support for switching to vm86 mode with proper 

exception handling.
This commit is contained in:
Alexandre Julliard 2000-09-18 02:15:07 +00:00
parent 6dbf67e566
commit 45b2c868bb
2 changed files with 264 additions and 73 deletions
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325
dlls/ntdll/signal_i386.c
View File

@ -25,6 +25,10 @@
# endif
#endif
#ifdef HAVE_SYS_VM86_H
# include <sys/vm86.h>
#endif
#include "selectors.h"
/***********************************************************************
@ -104,6 +108,22 @@ static inline int wine_sigaltstack( const struct sigaltstack *new,
}
#endif
static inline int wine_vm86plus( int func, struct vm86plus_struct *ptr )
{
int res;
__asm__ __volatile__( "pushl %%fs\n\t"
"pushl %%ebx\n\t"
"movl %2,%%ebx\n\t"
"int $0x80\n\t"
"popl %%ebx\n\t"
"popl %%fs"
: "=a" (res)
: "0" (166 /*SYS_vm86*/), "g" (func), "c" (ptr) );
if (res >= 0) return res;
errno = -res;
return -1;
}
#endif /* linux */
#ifdef BSDI
@ -332,7 +352,9 @@ static inline void handler_init( CONTEXT *context, const SIGCONTEXT *sigcontext
#endif
context->SegFs = fs;
/* now restore a proper %fs for the fault handler */
if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext))) fs = SYSLEVEL_Win16CurrentTeb;
if ((EFL_sig(sigcontext) & 0x00020000) || /* vm86 mode */
!IS_SELECTOR_SYSTEM(CS_sig(sigcontext))) /* 16-bit mode */
fs = SYSLEVEL_Win16CurrentTeb;
if (!fs) fs = SYSLEVEL_EmergencyTeb;
__set_fs(fs);
}
@ -351,6 +373,34 @@ static inline int get_trap_code( const SIGCONTEXT *sigcontext )
#endif
}
/***********************************************************************
* get_error_code
*
* Get the error code for a signal.
*/
static inline int get_error_code( const SIGCONTEXT *sigcontext )
{
#ifdef ERROR_sig
return ERROR_sig(sigcontext);
#else
return 0;
#endif
}
/***********************************************************************
* get_cr2_value
*
* Get the CR2 value for a signal.
*/
static inline void *get_cr2_value( const SIGCONTEXT *sigcontext )
{
#ifdef CR2_sig
return (void *)CR2_sig(sigcontext);
#else
return NULL;
#endif
}
/***********************************************************************
* save_context
*
@ -484,31 +534,27 @@ static inline DWORD get_fpu_code( const CONTEXT *context )
/**********************************************************************
* segv_handler
* do_segv
*
* Handler for SIGSEGV and related errors.
* Implementation of SIGSEGV handler.
*/
static HANDLER_DEF(segv_handler)
static void do_segv( CONTEXT *context, int trap_code, void *cr2, int err_code )
{
EXCEPTION_RECORD rec;
CONTEXT context;
DWORD page_fault_code = EXCEPTION_ACCESS_VIOLATION;
handler_init( &context, HANDLER_CONTEXT );
#ifdef CR2_sig
/* we want the page-fault case to be fast */
if (get_trap_code(HANDLER_CONTEXT) == T_PAGEFLT)
if (!(page_fault_code = VIRTUAL_HandleFault( (LPVOID)CR2_sig(HANDLER_CONTEXT) ))) return;
if (trap_code == T_PAGEFLT)
if (!(page_fault_code = VIRTUAL_HandleFault( cr2 ))) return;
#endif
save_context( &context, HANDLER_CONTEXT );
rec.ExceptionRecord = NULL;
rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
rec.ExceptionAddress = (LPVOID)context.Eip;
rec.ExceptionAddress = (LPVOID)context->Eip;
rec.NumberParameters = 0;
switch(get_trap_code(HANDLER_CONTEXT))
switch(trap_code)
{
case T_OFLOW: /* Overflow exception */
rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
@ -525,33 +571,30 @@ static HANDLER_DEF(segv_handler)
case T_SEGNPFLT: /* Segment not present exception */
case T_PROTFLT: /* General protection fault */
case T_UNKNOWN: /* Unknown fault code */
if (INSTR_EmulateInstruction( &context )) goto restore;
if (INSTR_EmulateInstruction( context )) return;
rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
break;
case T_PAGEFLT: /* Page fault */
#ifdef CR2_sig
rec.NumberParameters = 2;
#ifdef ERROR_sig
rec.ExceptionInformation[0] = (ERROR_sig(HANDLER_CONTEXT) & 2) != 0;
#else
rec.ExceptionInformation[0] = (err_code & 2) != 0;
rec.ExceptionInformation[0] = 0;
#endif /* ERROR_sig */
rec.ExceptionInformation[1] = CR2_sig(HANDLER_CONTEXT);
rec.ExceptionInformation[1] = (DWORD)cr2;
#endif /* CR2_sig */
rec.ExceptionCode = page_fault_code;
break;
case T_ALIGNFLT: /* Alignment check exception */
/* FIXME: pass through exception handler first? */
if (context.EFlags & 0x00040000)
if (context->EFlags & 0x00040000)
{
/* Disable AC flag, return */
context.EFlags &= ~0x00040000;
goto restore;
context->EFlags &= ~0x00040000;
return;
}
rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
break;
default:
ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
ERR( "Got unexpected trap %d\n", trap_code );
/* fall through */
case T_NMI: /* NMI interrupt */
case T_DNA: /* Device not available exception */
@ -565,9 +608,87 @@ static HANDLER_DEF(segv_handler)
rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
break;
}
EXC_RtlRaiseException( &rec, context );
}
EXC_RtlRaiseException( &rec, &context );
restore:
/**********************************************************************
* do_trap
*
* Implementation of SIGTRAP handler.
*/
static void do_trap( CONTEXT *context, int trap_code )
{
EXCEPTION_RECORD rec;
rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
rec.ExceptionRecord = NULL;
rec.ExceptionAddress = (LPVOID)context->Eip;
rec.NumberParameters = 0;
switch(trap_code)
{
case T_TRCTRAP: /* Single-step exception */
rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
context->EFlags &= ~0x100; /* clear single-step flag */
break;
case T_BPTFLT: /* Breakpoint exception */
rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
/* fall through */
default:
rec.ExceptionCode = EXCEPTION_BREAKPOINT;
break;
}
EXC_RtlRaiseException( &rec, context );
}
/**********************************************************************
* do_fpe
*
* Implementation of SIGFPE handler
*/
static void do_fpe( CONTEXT *context, int trap_code )
{
EXCEPTION_RECORD rec;
switch(trap_code)
{
case T_DIVIDE: /* Division by zero exception */
rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
break;
case T_FPOPFLT: /* Coprocessor segment overrun */
rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
break;
case T_ARITHTRAP: /* Floating point exception */
case T_UNKNOWN: /* Unknown fault code */
rec.ExceptionCode = get_fpu_code( context );
break;
default:
ERR( "Got unexpected trap %d\n", trap_code );
rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
break;
}
rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
rec.ExceptionRecord = NULL;
rec.ExceptionAddress = (LPVOID)context->Eip;
rec.NumberParameters = 0;
EXC_RtlRaiseException( &rec, context );
}
/**********************************************************************
* segv_handler
*
* Handler for SIGSEGV and related errors.
*/
static HANDLER_DEF(segv_handler)
{
CONTEXT context;
handler_init( &context, HANDLER_CONTEXT );
save_context( &context, HANDLER_CONTEXT );
do_segv( &context, get_trap_code(HANDLER_CONTEXT),
get_cr2_value(HANDLER_CONTEXT), get_error_code(HANDLER_CONTEXT) );
restore_context( &context, HANDLER_CONTEXT );
}
@ -579,31 +700,10 @@ static HANDLER_DEF(segv_handler)
*/
static HANDLER_DEF(trap_handler)
{
EXCEPTION_RECORD rec;
CONTEXT context;
handler_init( &context, HANDLER_CONTEXT );
save_context( &context, HANDLER_CONTEXT );
rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
rec.ExceptionRecord = NULL;
rec.ExceptionAddress = (LPVOID)context.Eip;
rec.NumberParameters = 0;
switch(get_trap_code(HANDLER_CONTEXT))
{
case T_TRCTRAP: /* Single-step exception */
rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
context.EFlags &= ~0x100; /* clear single-step flag */
break;
case T_BPTFLT: /* Breakpoint exception */
rec.ExceptionAddress = (char *) rec.ExceptionAddress - 1; /* back up over the int3 instruction */
/* fall through */
default:
rec.ExceptionCode = EXCEPTION_BREAKPOINT;
break;
}
EXC_RtlRaiseException( &rec, &context );
do_trap( &context, get_trap_code(HANDLER_CONTEXT) );
restore_context( &context, HANDLER_CONTEXT );
}
@ -615,36 +715,11 @@ static HANDLER_DEF(trap_handler)
*/
static HANDLER_DEF(fpe_handler)
{
EXCEPTION_RECORD rec;
CONTEXT context;
handler_init( &context, HANDLER_CONTEXT );
save_fpu( &context, HANDLER_CONTEXT );
switch(get_trap_code(HANDLER_CONTEXT))
{
case T_DIVIDE: /* Division by zero exception */
rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
break;
case T_FPOPFLT: /* Coprocessor segment overrun */
rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
break;
case T_ARITHTRAP: /* Floating point exception */
case T_UNKNOWN: /* Unknown fault code */
rec.ExceptionCode = get_fpu_code( &context );
break;
default:
ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
break;
}
save_context( &context, HANDLER_CONTEXT );
rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
rec.ExceptionRecord = NULL;
rec.ExceptionAddress = (LPVOID)context.Eip;
rec.NumberParameters = 0;
EXC_RtlRaiseException( &rec, &context );
do_fpe( &context, get_trap_code(HANDLER_CONTEXT) );
restore_context( &context, HANDLER_CONTEXT );
restore_fpu( &context, HANDLER_CONTEXT );
}
@ -754,6 +829,112 @@ BOOL SIGNAL_Init(void)
return FALSE;
}
#ifdef linux
/**********************************************************************
* __wine_enter_vm86
*
* Enter vm86 mode with the specified register context.
*/
void __wine_enter_vm86( CONTEXT *context )
{
EXCEPTION_RECORD rec;
int res;
struct vm86plus_struct vm86;
for (;;)
{
vm86.regs.eax = context->Eax;
vm86.regs.ebx = context->Ebx;
vm86.regs.ecx = context->Ecx;
vm86.regs.edx = context->Edx;
vm86.regs.esi = context->Esi;
vm86.regs.edi = context->Edi;
vm86.regs.esp = context->Esp;
vm86.regs.ebp = context->Ebp;
vm86.regs.eip = context->Eip;
vm86.regs.cs = context->SegCs;
vm86.regs.ds = context->SegDs;
vm86.regs.es = context->SegEs;
vm86.regs.fs = context->SegFs;
vm86.regs.gs = context->SegGs;
vm86.regs.eflags = context->EFlags;
if (vm86.regs.eflags & IF_MASK) vm86.regs.eflags |= VIF_MASK;
res = wine_vm86plus( VM86_ENTER, &vm86 );
context->Eax = vm86.regs.eax;
context->Ebx = vm86.regs.ebx;
context->Ecx = vm86.regs.ecx;
context->Edx = vm86.regs.edx;
context->Esi = vm86.regs.esi;
context->Edi = vm86.regs.edi;
context->Esp = vm86.regs.esp;
context->Ebp = vm86.regs.ebp;
context->Eip = vm86.regs.eip;
context->SegCs = vm86.regs.cs;
context->SegDs = vm86.regs.ds;
context->SegEs = vm86.regs.es;
context->SegFs = vm86.regs.fs;
context->SegGs = vm86.regs.gs;
context->EFlags = vm86.regs.eflags;
switch(VM86_TYPE(res))
{
case VM86_SIGNAL: /* return due to signal */
switch(VM86_ARG(res))
{
case SIGILL:
case SIGSEGV:
#ifdef SIGBUS
case SIGBUS:
#endif
do_segv( context, T_UNKNOWN, 0, 0 );
continue;
case SIGTRAP:
do_trap( context, T_UNKNOWN );
continue;
case SIGFPE:
do_fpe( context, T_UNKNOWN );
continue;
}
rec.ExceptionCode = EXCEPTION_VM86_SIGNAL;
break;
case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
do_segv( context, T_PROTFLT, 0, 0 );
continue;
case VM86_TRAP: /* return due to DOS-debugger request */
do_trap( context, T_UNKNOWN );
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 */
rec.ExceptionCode = EXCEPTION_VM86_STI;
break;
case VM86_PICRETURN: /* return due to pending PIC request */
rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
break;
default:
ERR( "unhandled result from vm86 mode %x\n", res );
continue;
}
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 );
}
}
#else /* linux */
void __wine_enter_vm86( CONTEXT *context )
{
MESSAGE("vm86 mode not supported on this platform\n");
}
#endif /* linux */
/**********************************************************************
* DbgBreakPoint (NTDLL)
*/

10
include/wine/exception.h
View File

@ -165,6 +165,16 @@ static inline EXCEPTION_FRAME * WINE_UNUSED __wine_pop_frame( EXCEPTION_FRAME *f
#endif
}
/* Wine-specific exceptions codes */
/* unhandled return status from vm86 mode */
#define EXCEPTION_VM86_SIGNAL 0x80000100
#define EXCEPTION_VM86_INTx 0x80000101
#define EXCEPTION_VM86_STI 0x80000102
#define EXCEPTION_VM86_PICRETURN 0x80000103
#ifdef __WINE__
extern void WINAPI EXC_RtlRaiseException( PEXCEPTION_RECORD, PCONTEXT );
extern BOOL SIGNAL_Init(void);