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/*
* i386 signal handling routines
*
* Copyright 1999 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
*/
#ifdef __i386__
#include "config.h"
#include "wine/port.h"
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#ifdef HAVE_SYSCALL_H
# include <syscall.h>
#else
# ifdef HAVE_SYS_SYSCALL_H
# include <sys/syscall.h>
# endif
#endif
#ifdef HAVE_SYS_VM86_H
# include <sys/vm86.h>
#endif
#ifdef HAVE_SYS_SIGNAL_H
# include <sys/signal.h>
#endif
#include "windef.h"
#include "thread.h"
#include "wine/library.h"
#include "ntdll_misc.h"
/***********************************************************************
* signal context platform-specific definitions
*/
#ifdef linux
typedef struct
{
unsigned short sc_gs, __gsh;
unsigned short sc_fs, __fsh;
unsigned short sc_es, __esh;
unsigned short sc_ds, __dsh;
unsigned long sc_edi;
unsigned long sc_esi;
unsigned long sc_ebp;
unsigned long sc_esp;
unsigned long sc_ebx;
unsigned long sc_edx;
unsigned long sc_ecx;
unsigned long sc_eax;
unsigned long sc_trapno;
unsigned long sc_err;
unsigned long sc_eip;
unsigned short sc_cs, __csh;
unsigned long sc_eflags;
unsigned long esp_at_signal;
unsigned short sc_ss, __ssh;
unsigned long i387;
unsigned long oldmask;
unsigned long cr2;
} volatile SIGCONTEXT;
#define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
#define HANDLER_CONTEXT (&__context)
/* this is the sigaction structure from the Linux 2.1.20 kernel. */
struct kernel_sigaction
{
void (*ksa_handler)();
unsigned long ksa_mask;
unsigned long ksa_flags;
void *ksa_restorer;
};
/* Similar to the sigaction function in libc, except it leaves alone the
restorer field, which is used to specify the signal stack address */
static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
struct kernel_sigaction *old )
{
__asm__ __volatile__( "pushl %%ebx\n\t"
"movl %2,%%ebx\n\t"
"int $0x80\n\t"
"popl %%ebx"
: "=a" (sig)
: "0" (SYS_sigaction), "S" (sig), "c" (new), "d" (old) );
if (sig>=0) return 0;
errno = -sig;
return -1;
}
#ifdef HAVE_SIGALTSTACK
/* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */
static inline int wine_sigaltstack( const struct sigaltstack *new,
struct sigaltstack *old )
{
int ret;
__asm__ __volatile__( "pushl %%ebx\n\t"
"movl %2,%%ebx\n\t"
"int $0x80\n\t"
"popl %%ebx"
: "=a" (ret)
: "0" (SYS_sigaltstack), "q" (new), "c" (old) );
if (ret >= 0) return 0;
errno = -ret;
return -1;
}
#endif
#define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
int vm86_enter( void **vm86_ptr );
void vm86_return(void);
void vm86_return_end(void);
__ASM_GLOBAL_FUNC(vm86_enter,
"pushl %ebp\n\t"
"movl %esp, %ebp\n\t"
"movl $166,%eax\n\t" /*SYS_vm86*/
"movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
"movl (%ecx),%ecx\n\t"
"pushl %ebx\n\t"
"movl $1,%ebx\n\t" /*VM86_ENTER*/
"pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */
"pushl %fs\n\t"
"pushl %gs\n\t"
"int $0x80\n"
".globl " __ASM_NAME("vm86_return") "\n\t"
__ASM_FUNC("vm86_return") "\n"
__ASM_NAME("vm86_return") ":\n\t"
"popl %gs\n\t"
"popl %fs\n\t"
"popl %ecx\n\t"
"popl %ebx\n\t"
"popl %ebp\n\t"
"testl %eax,%eax\n\t"
"jl 0f\n\t"
"cmpb $0,%al\n\t" /* VM86_SIGNAL */
"je " __ASM_NAME("vm86_enter") "\n\t"
"0:\n\t"
"movl 4(%esp),%ecx\n\t" /* vm86_ptr */
"movl $0,(%ecx)\n\t"
".globl " __ASM_NAME("vm86_return_end") "\n\t"
__ASM_FUNC("vm86_return_end") "\n"
__ASM_NAME("vm86_return_end") ":\n\t"
"ret" );
#ifdef HAVE_SYS_VM86_H
# define __HAVE_VM86
#endif
#endif /* linux */
#ifdef BSDI
#define EAX_sig(context) ((context)->tf_eax)
#define EBX_sig(context) ((context)->tf_ebx)
#define ECX_sig(context) ((context)->tf_ecx)
#define EDX_sig(context) ((context)->tf_edx)
#define ESI_sig(context) ((context)->tf_esi)
#define EDI_sig(context) ((context)->tf_edi)
#define EBP_sig(context) ((context)->tf_ebp)
#define CS_sig(context) ((context)->tf_cs)
#define DS_sig(context) ((context)->tf_ds)
#define ES_sig(context) ((context)->tf_es)
#define SS_sig(context) ((context)->tf_ss)
#include <machine/frame.h>
typedef struct trapframe SIGCONTEXT;
#define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
#define HANDLER_CONTEXT __context
#define EFL_sig(context) ((context)->tf_eflags)
#define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
#define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
#endif /* bsdi */
#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
typedef struct sigcontext SIGCONTEXT;
#define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
#define HANDLER_CONTEXT __context
#endif /* *BSD */
#if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
#ifdef _SCO_DS
#include <sys/regset.h>
#endif
/* Solaris kludge */
#undef ERR
#include <sys/ucontext.h>
#undef ERR
typedef struct ucontext SIGCONTEXT;
#define HANDLER_DEF(name) void name( int __signal, siginfo_t *__siginfo, SIGCONTEXT *__context )
#define HANDLER_CONTEXT __context
#endif /* svr4 || SCO_DS */
#ifdef __EMX__
typedef struct
{
unsigned long ContextFlags;
FLOATING_SAVE_AREA sc_float;
unsigned long sc_gs;
unsigned long sc_fs;
unsigned long sc_es;
unsigned long sc_ds;
unsigned long sc_edi;
unsigned long sc_esi;
unsigned long sc_eax;
unsigned long sc_ebx;
unsigned long sc_ecx;
unsigned long sc_edx;
unsigned long sc_ebp;
unsigned long sc_eip;
unsigned long sc_cs;
unsigned long sc_eflags;
unsigned long sc_esp;
unsigned long sc_ss;
} SIGCONTEXT;
#endif /* __EMX__ */
#ifdef __CYGWIN__
/* FIXME: This section is just here so it can compile, it's most likely
* completely wrong. */
typedef struct
{
unsigned short sc_gs, __gsh;
unsigned short sc_fs, __fsh;
unsigned short sc_es, __esh;
unsigned short sc_ds, __dsh;
unsigned long sc_edi;
unsigned long sc_esi;
unsigned long sc_ebp;
unsigned long sc_esp;
unsigned long sc_ebx;
unsigned long sc_edx;
unsigned long sc_ecx;
unsigned long sc_eax;
unsigned long sc_trapno;
unsigned long sc_err;
unsigned long sc_eip;
unsigned short sc_cs, __csh;
unsigned long sc_eflags;
unsigned long esp_at_signal;
unsigned short sc_ss, __ssh;
unsigned long i387;
unsigned long oldmask;
unsigned long cr2;
} SIGCONTEXT;
#define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
#define HANDLER_CONTEXT (&__context)
#endif /* __CYGWIN__ */
#ifdef __APPLE__
# include <sys/ucontext.h>
# include <sys/types.h>
# include <signal.h>
typedef ucontext_t SIGCONTEXT;
#define EAX_sig(context) ((context)->uc_mcontext->ss.eax)
#define EBX_sig(context) ((context)->uc_mcontext->ss.ebx)
#define ECX_sig(context) ((context)->uc_mcontext->ss.ecx)
#define EDX_sig(context) ((context)->uc_mcontext->ss.edx)
#define ESI_sig(context) ((context)->uc_mcontext->ss.esi)
#define EDI_sig(context) ((context)->uc_mcontext->ss.edi)
#define EBP_sig(context) ((context)->uc_mcontext->ss.ebp)
#define CS_sig(context) ((context)->uc_mcontext->ss.cs)
#define DS_sig(context) ((context)->uc_mcontext->ss.ds)
#define ES_sig(context) ((context)->uc_mcontext->ss.es)
#define FS_sig(context) ((context)->uc_mcontext->ss.fs)
#define GS_sig(context) ((context)->uc_mcontext->ss.gs)
#define SS_sig(context) ((context)->uc_mcontext->ss.ss)
#define EFL_sig(context) ((context)->uc_mcontext->ss.eflags)
#define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
#define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.esp))
#define HANDLER_DEF(name) void name( int __signal, siginfo_t *__siginfo, SIGCONTEXT *__context )
#define HANDLER_CONTEXT (__context)
#define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
#define ERROR_sig(context) ((context)->uc_mcontext->es.err)
#define FAULT_ADDRESS (__siginfo->si_addr)
#endif /* __APPLE__ */
#if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) ||\
defined(__OpenBSD__) || defined(__EMX__) || defined(__CYGWIN__)
#define EAX_sig(context) ((context)->sc_eax)
#define EBX_sig(context) ((context)->sc_ebx)
#define ECX_sig(context) ((context)->sc_ecx)
#define EDX_sig(context) ((context)->sc_edx)
#define ESI_sig(context) ((context)->sc_esi)
#define EDI_sig(context) ((context)->sc_edi)
#define EBP_sig(context) ((context)->sc_ebp)
#define CS_sig(context) ((context)->sc_cs)
#define DS_sig(context) ((context)->sc_ds)
#define ES_sig(context) ((context)->sc_es)
#define FS_sig(context) ((context)->sc_fs)
#define GS_sig(context) ((context)->sc_gs)
#define SS_sig(context) ((context)->sc_ss)
#define TRAP_sig(context) ((context)->sc_trapno)
#ifdef __NetBSD__
#define ERROR_sig(context) ((context)->sc_err)
#endif
#ifdef linux
#define ERROR_sig(context) ((context)->sc_err)
#define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->i387))
#define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->cr2)
#endif
#ifdef __FreeBSD__
#define EFL_sig(context) ((context)->sc_efl)
/* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge */
#define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->sc_err)
#else
#define EFL_sig(context) ((context)->sc_eflags)
#endif
#define EIP_sig(context) (*((unsigned long*)&(context)->sc_eip))
#define ESP_sig(context) (*((unsigned long*)&(context)->sc_esp))
#endif /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
#if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
#ifdef _SCO_DS
#define gregs regs
#endif
#define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
#define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
#define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
#define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
#define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
#define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
#define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
#define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
#define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
#define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
#define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
#define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
#define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
#define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
#define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
#ifdef UESP
#define ESP_sig(context) ((context)->uc_mcontext.gregs[UESP])
#elif defined(R_ESP)
#define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
#else
#define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
#endif
#ifdef TRAPNO
#define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
#endif
#define FAULT_ADDRESS (__siginfo->si_addr)
#endif /* svr4 || SCO_DS */
#include "wine/exception.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(seh);
typedef int (*wine_signal_handler)(unsigned int sig);
static size_t signal_stack_mask;
static size_t signal_stack_size;
static wine_signal_handler handlers[256];
extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( const CONTEXT *context );
enum i386_trap_code
{
TRAP_x86_UNKNOWN = -1, /* Unknown fault (TRAP_sig not defined) */
TRAP_x86_DIVIDE = 0, /* Division by zero exception */
TRAP_x86_TRCTRAP = 1, /* Single-step exception */
TRAP_x86_NMI = 2, /* NMI interrupt */
TRAP_x86_BPTFLT = 3, /* Breakpoint exception */
TRAP_x86_OFLOW = 4, /* Overflow exception */
TRAP_x86_BOUND = 5, /* Bound range exception */
TRAP_x86_PRIVINFLT = 6, /* Invalid opcode exception */
TRAP_x86_DNA = 7, /* Device not available exception */
TRAP_x86_DOUBLEFLT = 8, /* Double fault exception */
TRAP_x86_FPOPFLT = 9, /* Coprocessor segment overrun */
TRAP_x86_TSSFLT = 10, /* Invalid TSS exception */
TRAP_x86_SEGNPFLT = 11, /* Segment not present exception */
TRAP_x86_STKFLT = 12, /* Stack fault */
TRAP_x86_PROTFLT = 13, /* General protection fault */
TRAP_x86_PAGEFLT = 14, /* Page fault */
TRAP_x86_ARITHTRAP = 16, /* Floating point exception */
TRAP_x86_ALIGNFLT = 17, /* Alignment check exception */
TRAP_x86_MCHK = 18, /* Machine check exception */
TRAP_x86_CACHEFLT = 19 /* Cache flush exception */
};
/***********************************************************************
* dispatch_signal
*/
inline static int dispatch_signal(unsigned int sig)
{
if (handlers[sig] == NULL) return 0;
return handlers[sig](sig);
}
/***********************************************************************
* get_trap_code
*
* Get the trap code for a signal.
*/
static inline enum i386_trap_code get_trap_code( const SIGCONTEXT *sigcontext )
{
#ifdef TRAP_sig
return TRAP_sig(sigcontext);
#else
return TRAP_x86_UNKNOWN; /* unknown trap code */
#endif
}
/***********************************************************************
* get_error_code
*
* Get the error code for a signal.
*/
static inline WORD get_error_code( const SIGCONTEXT *sigcontext )
{
#ifdef ERROR_sig
return ERROR_sig(sigcontext);
#else
return 0;
#endif
}
/***********************************************************************
* get_signal_stack
*
* Get the base of the signal stack for the current thread.
*/
static inline void *get_signal_stack(void)
{
return (char *)NtCurrentTeb() + 4096;
}
/***********************************************************************
* get_current_teb
*
* Get the current teb based on the stack pointer.
*/
static inline TEB *get_current_teb(void)
{
unsigned long esp;
__asm__("movl %%esp,%0" : "=g" (esp) );
return (TEB *)(esp & ~signal_stack_mask);
}
#ifdef __HAVE_VM86
/***********************************************************************
* save_vm86_context
*
* Set the register values from a vm86 structure.
*/
static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *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->SegSs = vm86->regs.ss;
context->EFlags = vm86->regs.eflags;
}
/***********************************************************************
* restore_vm86_context
*
* Build a vm86 structure from the register values.
*/
static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
{
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.ss = context->SegSs;
vm86->regs.eflags = context->EFlags;
}
/**********************************************************************
* merge_vm86_pending_flags
*
* Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
* raises exception if there are pending events and VIF flag
* has been turned on.
*
* Called from __wine_enter_vm86 because vm86_enter
* doesn't check for pending events.
*
* Called from raise_vm86_sti_exception to check for
* pending events in a signal safe way.
*/
static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
{
BOOL check_pending = TRUE;
struct vm86plus_struct *vm86 =
(struct vm86plus_struct*)(ntdll_get_thread_data()->vm86_ptr);
/*
* In order to prevent a race when SIGUSR2 occurs while
* we are returning from exception handler, pending events
* will be rechecked after each raised exception.
*/
while (check_pending && NtCurrentTeb()->vm86_pending)
{
check_pending = FALSE;
ntdll_get_thread_data()->vm86_ptr = NULL;
/*
* If VIF is set, throw exception.
* Note that SIGUSR2 may turn VIF flag off so
* VIF check must occur only when TEB.vm86_ptr is NULL.
*/
if (vm86->regs.eflags & VIF_MASK)
{
CONTEXT vcontext;
save_vm86_context( &vcontext, vm86 );
rec->ExceptionCode = EXCEPTION_VM86_STI;
rec->ExceptionFlags = EXCEPTION_CONTINUABLE;
rec->ExceptionRecord = NULL;
rec->NumberParameters = 0;
rec->ExceptionAddress = (LPVOID)vcontext.Eip;
vcontext.EFlags &= ~VIP_MASK;
NtCurrentTeb()->vm86_pending = 0;
__regs_RtlRaiseException( rec, &vcontext );
restore_vm86_context( &vcontext, vm86 );
check_pending = TRUE;
}
ntdll_get_thread_data()->vm86_ptr = vm86;
}
/*
* Merge VIP flags in a signal safe way. This requires
* that the following operation compiles into atomic
* instruction.
*/
vm86->regs.eflags |= NtCurrentTeb()->vm86_pending;
}
#endif /* __HAVE_VM86 */
typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
/***********************************************************************
* init_handler
*
* Handler initialization when the full context is not needed.
*/
inline static void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
{
void *stack = (void *)ESP_sig(sigcontext);
TEB *teb = get_current_teb();
struct ntdll_thread_regs *thread_regs = (struct ntdll_thread_regs *)teb->SpareBytes1;
/* get %fs and %gs at time of the fault */
#ifdef FS_sig
*fs = LOWORD(FS_sig(sigcontext));
#else
*fs = wine_get_fs();
#endif
#ifdef GS_sig
*gs = LOWORD(GS_sig(sigcontext));
#else
*gs = wine_get_gs();
#endif
wine_set_fs( thread_regs->fs );
/* now restore a proper %gs for the fault handler */
if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
!wine_ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */
{
/*
* Win16 or DOS protected mode. Note that during switch
* from 16-bit mode to linear mode, CS may be set to system
* segment before FS is restored. Fortunately, in this case
* SS is still non-system segment. This is why both CS and SS
* are checked.
*/
wine_set_gs( thread_regs->gs );
stack = teb->WOW32Reserved;
}
#ifdef __HAVE_VM86
else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
{
unsigned int *int_stack = stack;
/* fetch the saved %gs from the stack */
wine_set_gs( int_stack[0] );
}
#endif
else /* 32-bit mode */
{
#ifdef GS_sig
wine_set_gs( GS_sig(sigcontext) );
#endif
}
return stack;
}
/***********************************************************************
* save_fpu
*
* Set the FPU context from a sigcontext.
*/
inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
{
context->ContextFlags |= CONTEXT86_FLOATING_POINT;
#ifdef FPU_sig
if (FPU_sig(sigcontext))
{
context->FloatSave = *FPU_sig(sigcontext);
return;
}
#endif /* FPU_sig */
#ifdef __GNUC__
__asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
#endif /* __GNUC__ */
}
/***********************************************************************
* restore_fpu
*
* Restore the FPU context to a sigcontext.
*/
inline static void restore_fpu( const CONTEXT *context )
{
FLOATING_SAVE_AREA float_status = context->FloatSave;
/* reset the current interrupt status */
float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
#ifdef __GNUC__
__asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
#endif /* __GNUC__ */
}
/***********************************************************************
* save_context
*
* Build a context structure from the signal info.
*/
inline static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
{
struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
memset(context, 0, sizeof(*context));
context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
context->Eax = EAX_sig(sigcontext);
context->Ebx = EBX_sig(sigcontext);
context->Ecx = ECX_sig(sigcontext);
context->Edx = EDX_sig(sigcontext);
context->Esi = ESI_sig(sigcontext);
context->Edi = EDI_sig(sigcontext);
context->Ebp = EBP_sig(sigcontext);
context->EFlags = EFL_sig(sigcontext);
context->Eip = EIP_sig(sigcontext);
context->Esp = ESP_sig(sigcontext);
context->SegCs = LOWORD(CS_sig(sigcontext));
context->SegDs = LOWORD(DS_sig(sigcontext));
context->SegEs = LOWORD(ES_sig(sigcontext));
context->SegFs = fs;
context->SegGs = gs;
context->SegSs = LOWORD(SS_sig(sigcontext));
context->Dr0 = regs->dr0;
context->Dr1 = regs->dr1;
context->Dr2 = regs->dr2;
context->Dr3 = regs->dr3;
context->Dr6 = regs->dr6;
context->Dr7 = regs->dr7;
}
/***********************************************************************
* restore_context
*
* Restore the signal info from the context.
*/
inline static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
{
struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
regs->dr0 = context->Dr0;
regs->dr1 = context->Dr1;
regs->dr2 = context->Dr2;
regs->dr3 = context->Dr3;
regs->dr6 = context->Dr6;
regs->dr7 = context->Dr7;
EAX_sig(sigcontext) = context->Eax;
EBX_sig(sigcontext) = context->Ebx;
ECX_sig(sigcontext) = context->Ecx;
EDX_sig(sigcontext) = context->Edx;
ESI_sig(sigcontext) = context->Esi;
EDI_sig(sigcontext) = context->Edi;
EBP_sig(sigcontext) = context->Ebp;
EFL_sig(sigcontext) = context->EFlags;
EIP_sig(sigcontext) = context->Eip;
ESP_sig(sigcontext) = context->Esp;
CS_sig(sigcontext) = context->SegCs;
DS_sig(sigcontext) = context->SegDs;
ES_sig(sigcontext) = context->SegEs;
SS_sig(sigcontext) = context->SegSs;
#ifdef GS_sig
GS_sig(sigcontext) = context->SegGs;
#else
wine_set_gs( context->SegGs );
#endif
#ifdef FS_sig
FS_sig(sigcontext) = context->SegFs;
#else
wine_set_fs( context->SegFs );
#endif
}
/***********************************************************************
* set_cpu_context
*
* Set the new CPU context. Used by NtSetContextThread.
*/
void set_cpu_context( const CONTEXT *context )
{
DWORD flags = context->ContextFlags & ~CONTEXT_i386;
if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
if (flags & CONTEXT_DEBUG_REGISTERS)
{
struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
regs->dr0 = context->Dr0;
regs->dr1 = context->Dr1;
regs->dr2 = context->Dr2;
regs->dr3 = context->Dr3;
regs->dr6 = context->Dr6;
regs->dr7 = context->Dr7;
}
if (flags & CONTEXT_FULL)
{
if ((flags & CONTEXT_FULL) != (CONTEXT_FULL & ~CONTEXT_i386))
FIXME( "setting partial context (%lx) not supported\n", flags );
else
__wine_call_from_32_restore_regs( context );
}
}
/***********************************************************************
* is_privileged_instr
*
* Check if the fault location is a privileged instruction.
* Based on the instruction emulation code in dlls/kernel/instr.c.
*/
static inline int is_privileged_instr( CONTEXT86 *context )
{
const BYTE *instr;
unsigned int prefix_count = 0;
if (!wine_ldt_is_system( context->SegCs )) return 0;
instr = (BYTE *)context->Eip;
for (;;) switch(*instr)
{
/* instruction prefixes */
case 0x2e: /* %cs: */
case 0x36: /* %ss: */
case 0x3e: /* %ds: */
case 0x26: /* %es: */
case 0x64: /* %fs: */
case 0x65: /* %gs: */
case 0x66: /* opcode size */
case 0x67: /* addr size */
case 0xf0: /* lock */
case 0xf2: /* repne */
case 0xf3: /* repe */
if (++prefix_count >= 15) return 0;
instr++;
continue;
case 0x0f: /* extended instruction */
switch(instr[1])
{
case 0x20: /* mov crX, reg */
case 0x21: /* mov drX, reg */
case 0x22: /* mov reg, crX */
case 0x23: /* mov reg drX */
return 1;
}
return 0;
case 0x6c: /* insb (%dx) */
case 0x6d: /* insl (%dx) */
case 0x6e: /* outsb (%dx) */
case 0x6f: /* outsl (%dx) */
case 0xcd: /* int $xx */
case 0xe4: /* inb al,XX */
case 0xe5: /* in (e)ax,XX */
case 0xe6: /* outb XX,al */
case 0xe7: /* out XX,(e)ax */
case 0xec: /* inb (%dx),%al */
case 0xed: /* inl (%dx),%eax */
case 0xee: /* outb %al,(%dx) */
case 0xef: /* outl %eax,(%dx) */
case 0xf4: /* hlt */
case 0xfa: /* cli */
case 0xfb: /* sti */
return 1;
default:
return 0;
}
}
/***********************************************************************
* setup_exception
*
* Setup a proper stack frame for the raise function, and modify the
* sigcontext so that the return from the signal handler will call
* the raise function.
*/
static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
{
struct stack_layout
{
void *ret_addr; /* return address from raise_func */
EXCEPTION_RECORD *rec_ptr; /* first arg for raise_func */
CONTEXT *context_ptr; /* second arg for raise_func */
CONTEXT context;
EXCEPTION_RECORD rec;
DWORD ebp;
DWORD eip;
} *stack;
WORD fs, gs;
stack = init_handler( sigcontext, &fs, &gs );
/* stack sanity checks */
if ((char *)stack >= (char *)get_signal_stack() &&
(char *)stack < (char *)get_signal_stack() + signal_stack_size)
{
ERR( "nested exception on signal stack in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
server_abort_thread(1);
}
if (stack - 1 > stack || /* check for overflow in subtraction */
(char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit ||
(char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
{
UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)stack;
if (diff < 4096)
{
ERR( "stack overflow %u bytes in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
diff, GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
server_abort_thread(1);
}
else WARN( "exception outside of stack limits in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
}
stack--; /* push the stack_layout structure */
stack->ret_addr = (void *)0xdeadbabe; /* raise_func must not return */
stack->rec_ptr = &stack->rec;
stack->context_ptr = &stack->context;
stack->rec.ExceptionRecord = NULL;
stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
stack->rec.NumberParameters = 0;
save_context( &stack->context, sigcontext, fs, gs );
/* now modify the sigcontext to return to the raise function */
ESP_sig(sigcontext) = (DWORD)stack;
EIP_sig(sigcontext) = (DWORD)func;
EFL_sig(sigcontext) &= ~0x100; /* clear single-step flag */
CS_sig(sigcontext) = wine_get_cs();
DS_sig(sigcontext) = wine_get_ds();
ES_sig(sigcontext) = wine_get_es();
FS_sig(sigcontext) = wine_get_fs();
GS_sig(sigcontext) = wine_get_gs();
SS_sig(sigcontext) = wine_get_ss();
return stack->rec_ptr;
}
/***********************************************************************
* get_exception_context
*
* Get a pointer to the context built by setup_exception.
*/
static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
{
return (CONTEXT *)rec - 1; /* cf. stack_layout structure */
}
/**********************************************************************
* get_fpu_code
*
* Get the FPU exception code from the FPU status.
*/
static inline DWORD get_fpu_code( const CONTEXT *context )
{
DWORD status = context->FloatSave.StatusWord;
if (status & 0x01) /* IE */
{
if (status & 0x40) /* SF */
return EXCEPTION_FLT_STACK_CHECK;
else
return EXCEPTION_FLT_INVALID_OPERATION;
}
if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
}
/**********************************************************************
* raise_segv_exception
*/
static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
{
switch(rec->ExceptionCode)
{
case EXCEPTION_ACCESS_VIOLATION:
if (rec->NumberParameters == 2)
rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] );
break;
case EXCEPTION_DATATYPE_MISALIGNMENT:
/* FIXME: pass through exception handler first? */
if (context->EFlags & 0x00040000)
{
/* Disable AC flag, return */
context->EFlags &= ~0x00040000;
goto done;
}
break;
}
__regs_RtlRaiseException( rec, context );
done:
NtSetContextThread( GetCurrentThread(), context );
}
/**********************************************************************
* raise_trap_exception
*/
static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
{
if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
{
if (context->EFlags & 0x100)
{
context->EFlags &= ~0x100; /* clear single-step flag */
}
else /* hardware breakpoint, fetch the debug registers */
{
context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
NtGetContextThread(GetCurrentThread(), context);
/* do we really have a bp from a debug register ?
* if not, then someone did a kill(SIGTRAP) on us, and we
* shall return a breakpoint, not a single step exception
*/
if (!(context->Dr6 & 0xf)) rec->ExceptionCode = EXCEPTION_BREAKPOINT;
context->ContextFlags |= CONTEXT_FULL; /* restore flags */
}
}
__regs_RtlRaiseException( rec, context );
NtSetContextThread( GetCurrentThread(), context );
}
/**********************************************************************
* raise_exception
*
* Generic raise function for exceptions that don't need special treatment.
*/
static void WINAPI raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
{
__regs_RtlRaiseException( rec, context );
NtSetContextThread( GetCurrentThread(), context );
}
#ifdef __HAVE_VM86
/**********************************************************************
* raise_vm86_sti_exception
*/
static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
{
/* merge_vm86_pending_flags merges the vm86_pending flag in safely */
NtCurrentTeb()->vm86_pending |= VIP_MASK;
if (ntdll_get_thread_data()->vm86_ptr)
{
if (((char*)context->Eip >= (char*)vm86_return) &&
((char*)context->Eip <= (char*)vm86_return_end) &&
(VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
/* exiting from VM86, can't throw */
goto done;
}
merge_vm86_pending_flags( rec );
}
else if (NtCurrentTeb()->dpmi_vif &&
!wine_ldt_is_system(context->SegCs) &&
!wine_ldt_is_system(context->SegSs))
{
/* Executing DPMI code and virtual interrupts are enabled. */
NtCurrentTeb()->vm86_pending = 0;
__regs_RtlRaiseException( rec, context );
}
done:
NtSetContextThread( GetCurrentThread(), 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)
{
EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_vm86_sti_exception );
rec->ExceptionCode = EXCEPTION_VM86_STI;
}
#endif /* __HAVE_VM86 */
/**********************************************************************
* segv_handler
*
* Handler for SIGSEGV and related errors.
*/
static HANDLER_DEF(segv_handler)
{
EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_segv_exception );
switch(get_trap_code(HANDLER_CONTEXT))
{
case TRAP_x86_OFLOW: /* Overflow exception */
rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
break;
case TRAP_x86_BOUND: /* Bound range exception */
rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
break;
case TRAP_x86_PRIVINFLT: /* Invalid opcode exception */
rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
break;
case TRAP_x86_STKFLT: /* Stack fault */
rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
break;
case TRAP_x86_SEGNPFLT: /* Segment not present exception */
case TRAP_x86_PROTFLT: /* General protection fault */
case TRAP_x86_UNKNOWN: /* Unknown fault code */
if (!get_error_code(HANDLER_CONTEXT) && is_privileged_instr( get_exception_context(rec) ))
rec->ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
else
{
WORD err = get_error_code(HANDLER_CONTEXT);
rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
rec->NumberParameters = 2;
rec->ExceptionInformation[0] = 0;
/* if error contains a LDT selector, use that as fault address */
rec->ExceptionInformation[1] = (err & 7) == 4 ? (err & ~7) : 0xffffffff;
}
break;
case TRAP_x86_PAGEFLT: /* Page fault */
rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
#ifdef FAULT_ADDRESS
rec->NumberParameters = 2;
rec->ExceptionInformation[0] = (get_error_code(HANDLER_CONTEXT) & 2) != 0;
rec->ExceptionInformation[1] = (ULONG_PTR)FAULT_ADDRESS;
#endif
break;
case TRAP_x86_ALIGNFLT: /* Alignment check exception */
rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
break;
default:
ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
/* fall through */
case TRAP_x86_NMI: /* NMI interrupt */
case TRAP_x86_DNA: /* Device not available exception */
case TRAP_x86_DOUBLEFLT: /* Double fault exception */
case TRAP_x86_TSSFLT: /* Invalid TSS exception */
case TRAP_x86_MCHK: /* Machine check exception */
case TRAP_x86_CACHEFLT: /* Cache flush exception */
rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
break;
}
}
/**********************************************************************
* trap_handler
*
* Handler for SIGTRAP.
*/
static HANDLER_DEF(trap_handler)
{
EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_trap_exception );
switch(get_trap_code(HANDLER_CONTEXT))
{
case TRAP_x86_TRCTRAP: /* Single-step exception */
rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
break;
case TRAP_x86_BPTFLT: /* Breakpoint exception */
rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */
/* fall through */
default:
rec->ExceptionCode = EXCEPTION_BREAKPOINT;
break;
}
}
/**********************************************************************
* fpe_handler
*
* Handler for SIGFPE.
*/
static HANDLER_DEF(fpe_handler)
{
EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_exception );
CONTEXT *context;
context = get_exception_context( rec );
save_fpu( context, HANDLER_CONTEXT );
switch(get_trap_code(HANDLER_CONTEXT))
{
case TRAP_x86_DIVIDE: /* Division by zero exception */
rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
break;
case TRAP_x86_FPOPFLT: /* Coprocessor segment overrun */
rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
break;
case TRAP_x86_ARITHTRAP: /* Floating point exception */
case TRAP_x86_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;
}
}
/**********************************************************************
* int_handler
*
* Handler for SIGINT.
*
* FIXME: should not be calling external functions on the signal stack.
*/
static HANDLER_DEF(int_handler)
{
WORD fs, gs;
init_handler( HANDLER_CONTEXT, &fs, &gs );
if (!dispatch_signal(SIGINT))
{
EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_exception );
rec->ExceptionCode = CONTROL_C_EXIT;
}
}
/**********************************************************************
* abrt_handler
*
* Handler for SIGABRT.
*/
static HANDLER_DEF(abrt_handler)
{
EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_exception );
rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
rec->ExceptionFlags = EH_NONCONTINUABLE;
}
/**********************************************************************
* term_handler
*
* Handler for SIGTERM.
*/
static HANDLER_DEF(term_handler)
{
WORD fs, gs;
init_handler( HANDLER_CONTEXT, &fs, &gs );
server_abort_thread(0);
}
/**********************************************************************
* usr1_handler
*
* Handler for SIGUSR1, used to signal a thread that it got suspended.
*/
static HANDLER_DEF(usr1_handler)
{
WORD fs, gs;
CONTEXT context;
init_handler( HANDLER_CONTEXT, &fs, &gs );
save_context( &context, HANDLER_CONTEXT, fs, gs );
wait_suspend( &context );
restore_context( &context, HANDLER_CONTEXT );
}
/**********************************************************************
* get_signal_stack_total_size
*
* Retrieve the size to allocate for the signal stack, including the TEB at the bottom.
* Must be a power of two.
*/
size_t get_signal_stack_total_size(void)
{
static const size_t teb_size = 4096; /* we reserve one page for the TEB */
if (!signal_stack_size)
{
size_t size = 4096, min_size = teb_size + max( MINSIGSTKSZ, 4096 );
/* find the first power of two not smaller than min_size */
while (size < min_size) size *= 2;
signal_stack_mask = size - 1;
signal_stack_size = size - teb_size;
}
return signal_stack_size + teb_size;
}
/***********************************************************************
* set_handler
*
* Set a signal handler
*/
static int set_handler( int sig, int have_sigaltstack, void (*func)() )
{
struct sigaction sig_act;
#ifdef linux
if (!have_sigaltstack)
{
struct kernel_sigaction sig_act;
sig_act.ksa_handler = func;
sig_act.ksa_flags = SA_RESTART;
sig_act.ksa_mask = (1 << (SIGINT-1)) |
(1 << (SIGUSR1-1)) |
(1 << (SIGUSR2-1));
/* point to the top of the signal stack */
sig_act.ksa_restorer = (char *)get_signal_stack() + signal_stack_size;
return wine_sigaction( sig, &sig_act, NULL );
}
#endif /* linux */
sig_act.sa_handler = func;
sigemptyset( &sig_act.sa_mask );
sigaddset( &sig_act.sa_mask, SIGINT );
sigaddset( &sig_act.sa_mask, SIGUSR1 );
sigaddset( &sig_act.sa_mask, SIGUSR2 );
#if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
sig_act.sa_flags = SA_RESTART;
#elif defined (__svr4__) || defined(_SCO_DS) || defined(__APPLE__)
sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
#else
sig_act.sa_flags = 0;
#endif
#ifdef SA_ONSTACK
if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
#endif
return sigaction( sig, &sig_act, NULL );
}
/***********************************************************************
* __wine_set_signal_handler (NTDLL.@)
*/
int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
{
if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
if (handlers[sig] != NULL) return -2;
handlers[sig] = wsh;
return 0;
}
/**********************************************************************
* SIGNAL_Init
*/
BOOL SIGNAL_Init(void)
{
int have_sigaltstack = 0;
#ifdef HAVE_SIGALTSTACK
struct sigaltstack ss;
ss.ss_sp = get_signal_stack();
ss.ss_size = signal_stack_size;
ss.ss_flags = 0;
if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
#ifdef linux
/* sigaltstack may fail because the kernel is too old, or
because glibc is brain-dead. In the latter case a
direct system call should succeed. */
else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
#endif /* linux */
#endif /* HAVE_SIGALTSTACK */
if (set_handler( SIGINT, have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
if (set_handler( SIGFPE, have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
if (set_handler( SIGILL, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
if (set_handler( SIGABRT, have_sigaltstack, (void (*)())abrt_handler ) == -1) goto error;
if (set_handler( SIGTERM, have_sigaltstack, (void (*)())term_handler ) == -1) goto error;
if (set_handler( SIGUSR1, have_sigaltstack, (void (*)())usr1_handler ) == -1) goto error;
#ifdef SIGBUS
if (set_handler( SIGBUS, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
#endif
#ifdef SIGTRAP
if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
#endif
#ifdef __HAVE_VM86
if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
#endif
return TRUE;
error:
perror("sigaction");
return FALSE;
}
#ifdef __HAVE_VM86
/**********************************************************************
* __wine_enter_vm86 (NTDLL.@)
*
* Enter vm86 mode with the specified register context.
*/
void __wine_enter_vm86( CONTEXT *context )
{
EXCEPTION_RECORD rec;
int res;
struct vm86plus_struct vm86;
memset( &vm86, 0, sizeof(vm86) );
for (;;)
{
restore_vm86_context( context, &vm86 );
ntdll_get_thread_data()->vm86_ptr = &vm86;
merge_vm86_pending_flags( &rec );
res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
if (res < 0)
{
errno = -res;
return;
}
save_vm86_context( context, &vm86 );
rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
rec.ExceptionRecord = NULL;
rec.ExceptionAddress = (LPVOID)context->Eip;
rec.NumberParameters = 0;
switch(VM86_TYPE(res))
{
case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
raise_segv_exception( &rec, context );
continue;
case VM86_TRAP: /* return due to DOS-debugger request */
switch(VM86_ARG(res))
{
case TRAP_x86_TRCTRAP: /* Single-step exception, single step flag is cleared by raise_trap_exception */
rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
break;
case TRAP_x86_BPTFLT: /* Breakpoint exception */
rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
/* fall through */
default:
rec.ExceptionCode = EXCEPTION_BREAKPOINT;
break;
}
raise_trap_exception( &rec, context );
continue;
case VM86_INTx: /* int3/int x instruction (ARG = x) */
rec.ExceptionCode = EXCEPTION_VM86_INTx;
rec.NumberParameters = 1;
rec.ExceptionInformation[0] = VM86_ARG(res);
break;
case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
context->EFlags |= VIF_MASK;
context->EFlags &= ~VIP_MASK;
NtCurrentTeb()->vm86_pending = 0;
rec.ExceptionCode = EXCEPTION_VM86_STI;
break;
case VM86_PICRETURN: /* return due to pending PIC request */
rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
break;
case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
default:
ERR( "unhandled result from vm86 mode %x\n", res );
continue;
}
__regs_RtlRaiseException( &rec, context );
}
}
#else /* __HAVE_VM86 */
/**********************************************************************
* __wine_enter_vm86 (NTDLL.@)
*/
void __wine_enter_vm86( CONTEXT *context )
{
MESSAGE("vm86 mode not supported on this platform\n");
}
#endif /* __HAVE_VM86 */
/**********************************************************************
* DbgBreakPoint (NTDLL.@)
*/
__ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
/**********************************************************************
* DbgUserBreakPoint (NTDLL.@)
*/
__ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
/**********************************************************************
* EXC_CallHandler (internal)
*
* Some exception handlers depend on EBP to have a fixed position relative to
* the exception frame.
* Shrinker depends on (*1) doing what it does,
* (*2) being the exact instruction it is and (*3) beginning with 0x64
* (i.e. the %fs prefix to the movl instruction). It also depends on the
* function calling the handler having only 5 parameters (*4).
*/
__ASM_GLOBAL_FUNC( EXC_CallHandler,
" pushl %ebp\n"
" movl %esp, %ebp\n"
" subl $4,%esp\n"
" movl 28(%ebp), %edx\n" /* ugly hack to pass the 6th param needed because of Shrinker */
" pushl 24(%ebp)\n"
" pushl 20(%ebp)\n"
" pushl 16(%ebp)\n"
" pushl 12(%ebp)\n"
" pushl 8(%ebp)\n"
" call " __ASM_NAME("call_exception_handler") "\n"
" leave\n"
" ret\n"
);
__ASM_GLOBAL_FUNC(call_exception_handler,
" pushl %ebp\n"
" movl %esp, %ebp\n"
" subl $12,%esp\n"
" pushl 12(%ebp)\n" /* make any exceptions in this... */
" pushl %edx\n" /* handler be handled by... */
" .byte 0x64\n"
" pushl (0)\n" /* nested_handler (passed in edx). */
" .byte 0x64\n"
" movl %esp,(0)\n" /* push the new exception frame onto the exception stack. */
" pushl 20(%ebp)\n"
" pushl 16(%ebp)\n"
" pushl 12(%ebp)\n"
" pushl 8(%ebp)\n"
" movl 24(%ebp), %ecx\n" /* (*1) */
" call *%ecx\n" /* call handler. (*2) */
" .byte 0x64\n"
" movl (0), %esp\n" /* restore previous... (*3) */
" .byte 0x64\n"
" popl (0)\n" /* exception frame. */
" movl %ebp, %esp\n" /* restore saved stack, in case it was corrupted */
" popl %ebp\n"
" ret $20\n" /* (*4) */
);
#endif /* __i386__ */
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