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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 "winbase.h"
#include "winreg.h"
#include "winternl.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;
} 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), "r" (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), "r" (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 /* FreeBSD */
#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, void *__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__ */
#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 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 */
/* exception code definitions (already defined by FreeBSD/NetBSD) */
#if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */
#define T_DIVIDE 0 /* Division by zero exception */
#define T_TRCTRAP 1 /* Single-step exception */
#define T_NMI 2 /* NMI interrupt */
#define T_BPTFLT 3 /* Breakpoint exception */
#define T_OFLOW 4 /* Overflow exception */
#define T_BOUND 5 /* Bound range exception */
#define T_PRIVINFLT 6 /* Invalid opcode exception */
#define T_DNA 7 /* Device not available exception */
#define T_DOUBLEFLT 8 /* Double fault exception */
#define T_FPOPFLT 9 /* Coprocessor segment overrun */
#define T_TSSFLT 10 /* Invalid TSS exception */
#define T_SEGNPFLT 11 /* Segment not present exception */
#define T_STKFLT 12 /* Stack fault */
#define T_PROTFLT 13 /* General protection fault */
#define T_PAGEFLT 14 /* Page fault */
#define T_RESERVED 15 /* Unknown exception */
#define T_ARITHTRAP 16 /* Floating point exception */
#define T_ALIGNFLT 17 /* Alignment check exception */
#define T_MCHK 18 /* Machine check exception */
#define T_CACHEFLT 19 /* Cache flush exception */
#endif
#if defined(__NetBSD__)
#define T_MCHK 19 /* Machine check exception */
#endif
#define T_UNKNOWN (-1) /* Unknown fault (TRAP_sig not defined) */
#include "wine/exception.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(seh);
typedef int (*wine_signal_handler)(unsigned int sig);
static wine_signal_handler handlers[256];
extern void WINAPI EXC_RtlRaiseException( PEXCEPTION_RECORD, PCONTEXT );
extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( CONTEXT context );
/***********************************************************************
* 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 int get_trap_code( const SIGCONTEXT *sigcontext )
{
#ifdef TRAP_sig
return TRAP_sig(sigcontext);
#else
return T_UNKNOWN; /* unknown trap code */
#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_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 & ~4095) - 4096);
}
#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*)(NtCurrentTeb()->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;
NtCurrentTeb()->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;
EXC_RtlRaiseException( rec, &vcontext );
restore_vm86_context( &vcontext, vm86 );
check_pending = TRUE;
}
NtCurrentTeb()->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.
*/
static void *init_handler( const SIGCONTEXT *sigcontext )
{
void *stack = (void *)ESP_sig(sigcontext);
TEB *teb = get_current_teb();
wine_set_fs( teb->teb_sel );
/* 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( teb->gs_sel );
stack = (void *)teb->cur_stack;
}
#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 )
{
#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( CONTEXT *context )
{
/* reset the current interrupt status */
context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
#ifdef __GNUC__
/* avoid nested exceptions */
__asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
#endif /* __GNUC__ */
}
/***********************************************************************
* 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 */
void *dummy; /* dummy ret addr for __wine_call_from_32_restore_regs */
CONTEXT context;
EXCEPTION_RECORD rec;
DWORD ebp;
DWORD eip;
} *stack;
WORD fs, gs;
/* 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
stack = init_handler( sigcontext );
/* 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 ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit + 4096 ||
(char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
{
UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit + 4096 - (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 = __wine_call_from_32_restore_regs;
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;
stack->context.ContextFlags = CONTEXT_FULL;
stack->context.Eax = EAX_sig(sigcontext);
stack->context.Ebx = EBX_sig(sigcontext);
stack->context.Ecx = ECX_sig(sigcontext);
stack->context.Edx = EDX_sig(sigcontext);
stack->context.Esi = ESI_sig(sigcontext);
stack->context.Edi = EDI_sig(sigcontext);
stack->context.Ebp = EBP_sig(sigcontext);
stack->context.EFlags = EFL_sig(sigcontext);
stack->context.Eip = EIP_sig(sigcontext);
stack->context.Esp = ESP_sig(sigcontext);
stack->context.SegCs = LOWORD(CS_sig(sigcontext));
stack->context.SegDs = LOWORD(DS_sig(sigcontext));
stack->context.SegEs = LOWORD(ES_sig(sigcontext));
stack->context.SegFs = fs;
stack->context.SegGs = gs;
stack->context.SegSs = LOWORD(SS_sig(sigcontext));
/* now modify the sigcontext to return to the raise function */
ESP_sig(sigcontext) = (DWORD)stack;
EIP_sig(sigcontext) = (DWORD)func;
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)
{
if (!(rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] )))
return;
}
break;
case EXCEPTION_DATATYPE_MISALIGNMENT:
/* FIXME: pass through exception handler first? */
if (context->EFlags & 0x00040000)
{
/* Disable AC flag, return */
context->EFlags &= ~0x00040000;
return;
}
break;
}
EXC_RtlRaiseException( rec, context );
}
/**********************************************************************
* raise_trap_exception
*/
static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
{
DWORD dr0, dr1, dr2, dr3, dr6, dr7;
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;
}
}
dr0 = context->Dr0;
dr1 = context->Dr1;
dr2 = context->Dr2;
dr3 = context->Dr3;
dr6 = context->Dr6;
dr7 = context->Dr7;
EXC_RtlRaiseException( rec, context );
if (dr0 != context->Dr0 || dr1 != context->Dr1 || dr2 != context->Dr2 ||
dr3 != context->Dr3 || dr6 != context->Dr6 || dr7 != context->Dr7)
{
/* the debug registers have changed, set the new values */
context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
NtSetContextThread(GetCurrentThread(), context);
}
}
/**********************************************************************
* raise_fpu_exception
*/
static void WINAPI raise_fpu_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
{
EXC_RtlRaiseException( rec, context );
restore_fpu( 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 (NtCurrentTeb()->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 */
return;
}
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;
EXC_RtlRaiseException( rec, 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 T_OFLOW: /* Overflow exception */
rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
break;
case T_BOUND: /* Bound range exception */
rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
break;
case T_PRIVINFLT: /* Invalid opcode exception */
rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
break;
case T_STKFLT: /* Stack fault */
rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
break;
case T_SEGNPFLT: /* Segment not present exception */
case T_PROTFLT: /* General protection fault */
case T_UNKNOWN: /* Unknown fault code */
rec->ExceptionCode = get_error_code(HANDLER_CONTEXT) ? EXCEPTION_ACCESS_VIOLATION
: EXCEPTION_PRIV_INSTRUCTION;
break;
case T_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] = (DWORD)FAULT_ADDRESS;
#endif
break;
case T_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 T_NMI: /* NMI interrupt */
case T_DNA: /* Device not available exception */
case T_DOUBLEFLT: /* Double fault exception */
case T_TSSFLT: /* Invalid TSS exception */
case T_RESERVED: /* Unknown exception */
case T_MCHK: /* Machine check exception */
#ifdef T_CACHEFLT
case T_CACHEFLT: /* Cache flush exception */
#endif
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 T_TRCTRAP: /* Single-step exception */
rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
EFL_sig(HANDLER_CONTEXT) &= ~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;
}
}
/**********************************************************************
* fpe_handler
*
* Handler for SIGFPE.
*/
static HANDLER_DEF(fpe_handler)
{
EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_fpu_exception );
CONTEXT *context;
context = get_exception_context( rec );
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;
}
}
/**********************************************************************
* int_handler
*
* Handler for SIGINT.
*/
static HANDLER_DEF(int_handler)
{
init_handler( HANDLER_CONTEXT );
if (!dispatch_signal(SIGINT))
{
EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, EXC_RtlRaiseException );
rec->ExceptionCode = CONTROL_C_EXIT;
}
}
/**********************************************************************
* abrt_handler
*
* Handler for SIGABRT.
*/
static HANDLER_DEF(abrt_handler)
{
EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, EXC_RtlRaiseException );
rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
rec->ExceptionFlags = EH_NONCONTINUABLE;
}
/**********************************************************************
* term_handler
*
* Handler for SIGTERM.
*/
static HANDLER_DEF(term_handler)
{
init_handler( HANDLER_CONTEXT );
server_abort_thread(0);
}
/**********************************************************************
* usr1_handler
*
* Handler for SIGUSR1, used to signal a thread that it got suspended.
*/
static HANDLER_DEF(usr1_handler)
{
LARGE_INTEGER timeout;
init_handler( HANDLER_CONTEXT );
/* wait with 0 timeout, will only return once the thread is no longer suspended */
timeout.QuadPart = 0;
NTDLL_wait_for_multiple_objects( 0, NULL, 0, &timeout );
}
/***********************************************************************
* 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 << (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, SIGUSR2 );
#if defined(linux) || defined(__NetBSD__)
sig_act.sa_flags = SA_RESTART;
#elif defined (__svr4__) || defined(_SCO_DS)
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;
TEB *teb = NtCurrentTeb();
int res;
struct vm86plus_struct vm86;
memset( &vm86, 0, sizeof(vm86) );
for (;;)
{
restore_vm86_context( context, &vm86 );
teb->vm86_ptr = &vm86;
merge_vm86_pending_flags( &rec );
res = vm86_enter( &teb->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 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;
}
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;
teb->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;
}
EXC_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");
#endif /* __i386__ */
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