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wine/dlls/ntdll/signal_i386.c

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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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>
#include <sys/types.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
#ifdef HAVE_SYS_SYSCTL_H
# include <sys/sysctl.h>
#endif
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "wine/library.h"
#include "ntdll_misc.h"
#include "wine/exception.h"
#include "wine/debug.h"
#ifdef HAVE_VALGRIND_MEMCHECK_H
#include <valgrind/memcheck.h>
#endif
#undef ERR /* Solaris needs to define this */
/* not defined for x86, so copy the x86_64 definition */
typedef struct DECLSPEC_ALIGN(16) _M128A
{
ULONGLONG Low;
LONGLONG High;
} M128A;
typedef struct
{
WORD ControlWord;
WORD StatusWord;
BYTE TagWord;
BYTE Reserved1;
WORD ErrorOpcode;
DWORD ErrorOffset;
WORD ErrorSelector;
WORD Reserved2;
DWORD DataOffset;
WORD DataSelector;
WORD Reserved3;
DWORD MxCsr;
DWORD MxCsr_Mask;
M128A FloatRegisters[8];
M128A XmmRegisters[16];
BYTE Reserved4[96];
} XMM_SAVE_AREA32;
/***********************************************************************
* signal context platform-specific definitions
*/
#ifdef linux
typedef ucontext_t SIGCONTEXT;
#define EAX_sig(context) ((context)->uc_mcontext.gregs[REG_EAX])
#define EBX_sig(context) ((context)->uc_mcontext.gregs[REG_EBX])
#define ECX_sig(context) ((context)->uc_mcontext.gregs[REG_ECX])
#define EDX_sig(context) ((context)->uc_mcontext.gregs[REG_EDX])
#define ESI_sig(context) ((context)->uc_mcontext.gregs[REG_ESI])
#define EDI_sig(context) ((context)->uc_mcontext.gregs[REG_EDI])
#define EBP_sig(context) ((context)->uc_mcontext.gregs[REG_EBP])
#define ESP_sig(context) ((context)->uc_mcontext.gregs[REG_ESP])
#define CS_sig(context) ((context)->uc_mcontext.gregs[REG_CS])
#define DS_sig(context) ((context)->uc_mcontext.gregs[REG_DS])
#define ES_sig(context) ((context)->uc_mcontext.gregs[REG_ES])
#define SS_sig(context) ((context)->uc_mcontext.gregs[REG_SS])
#define FS_sig(context) ((context)->uc_mcontext.gregs[REG_FS])
#define GS_sig(context) ((context)->uc_mcontext.gregs[REG_GS])
#define EFL_sig(context) ((context)->uc_mcontext.gregs[REG_EFL])
#define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
#define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->uc_mcontext.fpregs))
#define FPUX_sig(context) (FPU_sig(context) && !((context)->uc_mcontext.fpregs->status >> 16) ? (XMM_SAVE_AREA32 *)(FPU_sig(context) + 1) : NULL)
#define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
#define VIF_FLAG 0x00080000
#define VIP_FLAG 0x00100000
int vm86_enter( void **vm86_ptr );
void vm86_return(void);
void vm86_return_end(void);
__ASM_GLOBAL_FUNC(vm86_enter,
"pushl %ebp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"pushl %ebx\n\t"
__ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
"movl $166,%eax\n\t" /*SYS_vm86*/
"movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
"movl (%ecx),%ecx\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"
__ASM_CFI(".cfi_same_value %ebx\n\t")
"popl %ebp\n\t"
__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
__ASM_CFI(".cfi_same_value %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
#include <machine/frame.h>
typedef struct trapframe SIGCONTEXT;
#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)
#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))
#define FPU_sig(context) NULL /* FIXME */
#define FPUX_sig(context) NULL /* FIXME */
#endif /* bsdi */
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
#include <machine/trap.h>
typedef struct sigcontext SIGCONTEXT;
#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)
#define ERROR_sig(context) ((context)->sc_err)
#define EFL_sig(context) ((context)->sc_eflags)
#define EIP_sig(context) ((context)->sc_eip)
#define ESP_sig(context) ((context)->sc_esp)
#define FPU_sig(context) NULL /* FIXME */
#define FPUX_sig(context) NULL /* FIXME */
#endif /* __FreeBSD__ */
#ifdef __OpenBSD__
typedef struct sigcontext SIGCONTEXT;
#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)
#define ERROR_sig(context) ((context)->sc_err)
#define EFL_sig(context) ((context)->sc_eflags)
#define EIP_sig(context) ((context)->sc_eip)
#define ESP_sig(context) ((context)->sc_esp)
#define FPU_sig(context) NULL /* FIXME */
#define FPUX_sig(context) NULL /* FIXME */
#define T_MCHK T_MACHK
#define T_XMMFLT T_XFTRAP
#endif /* __OpenBSD__ */
#if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
#ifdef _SCO_DS
#include <sys/regset.h>
#endif
#include <sys/ucontext.h>
typedef struct ucontext SIGCONTEXT;
#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 ERR
#define ERROR_sig(context) ((context)->uc_mcontext.gregs[ERR])
#endif
#ifdef TRAPNO
#define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
#endif
#define FPU_sig(context) NULL /* FIXME */
#define FPUX_sig(context) NULL /* FIXME */
#endif /* svr4 || SCO_DS */
#ifdef __APPLE__
# include <sys/ucontext.h>
typedef ucontext_t SIGCONTEXT;
/* work around silly renaming of struct members in OS X 10.5 */
#if __DARWIN_UNIX03 && defined(_STRUCT_X86_EXCEPTION_STATE32)
#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 TRAP_sig(context) ((context)->uc_mcontext->__es.__trapno)
#define ERROR_sig(context) ((context)->uc_mcontext->__es.__err)
#define FPU_sig(context) NULL
#define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->__fs.__fpu_fcw)
#else
#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 TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
#define ERROR_sig(context) ((context)->uc_mcontext->es.err)
#define FPU_sig(context) NULL
#define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->fs.fpu_fcw)
#endif
#endif /* __APPLE__ */
#if defined(__NetBSD__)
# include <sys/ucontext.h>
# include <sys/types.h>
# include <signal.h>
typedef ucontext_t SIGCONTEXT;
#define EAX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EAX])
#define EBX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EBX])
#define ECX_sig(context) ((context)->uc_mcontext.__gregs[_REG_ECX])
#define EDX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EDX])
#define ESI_sig(context) ((context)->uc_mcontext.__gregs[_REG_ESI])
#define EDI_sig(context) ((context)->uc_mcontext.__gregs[_REG_EDI])
#define EBP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EBP])
#define ESP_sig(context) _UC_MACHINE_SP(context)
#define CS_sig(context) ((context)->uc_mcontext.__gregs[_REG_CS])
#define DS_sig(context) ((context)->uc_mcontext.__gregs[_REG_DS])
#define ES_sig(context) ((context)->uc_mcontext.__gregs[_REG_ES])
#define SS_sig(context) ((context)->uc_mcontext.__gregs[_REG_SS])
#define FS_sig(context) ((context)->uc_mcontext.__gregs[_REG_FS])
#define GS_sig(context) ((context)->uc_mcontext.__gregs[_REG_GS])
#define EFL_sig(context) ((context)->uc_mcontext.__gregs[_REG_EFL])
#define EIP_sig(context) _UC_MACHINE_PC(context)
#define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
#define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
#define FPU_sig(context) NULL
#define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&((context)->uc_mcontext.__fpregs))
#define T_MCHK T_MCA
#define T_XMMFLT T_XMM
#endif /* __NetBSD__ */
WINE_DEFAULT_DEBUG_CHANNEL(seh);
typedef int (*wine_signal_handler)(unsigned int sig);
static const size_t teb_size = 4096; /* we reserve one page for the TEB */
static size_t signal_stack_mask;
static size_t signal_stack_size;
static wine_signal_handler handlers[256];
static int fpux_support; /* whether the CPU support extended fpu context */
extern void DECLSPEC_NORETURN __wine_restore_regs( const CONTEXT *context );
enum i386_trap_code
{
TRAP_x86_UNKNOWN = -1, /* Unknown fault (TRAP_sig not defined) */
#if defined(__FreeBSD__) || defined (__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__)
TRAP_x86_DIVIDE = T_DIVIDE, /* Division by zero exception */
TRAP_x86_TRCTRAP = T_TRCTRAP, /* Single-step exception */
TRAP_x86_NMI = T_NMI, /* NMI interrupt */
TRAP_x86_BPTFLT = T_BPTFLT, /* Breakpoint exception */
TRAP_x86_OFLOW = T_OFLOW, /* Overflow exception */
TRAP_x86_BOUND = T_BOUND, /* Bound range exception */
TRAP_x86_PRIVINFLT = T_PRIVINFLT, /* Invalid opcode exception */
TRAP_x86_DNA = T_DNA, /* Device not available exception */
TRAP_x86_DOUBLEFLT = T_DOUBLEFLT, /* Double fault exception */
TRAP_x86_FPOPFLT = T_FPOPFLT, /* Coprocessor segment overrun */
TRAP_x86_TSSFLT = T_TSSFLT, /* Invalid TSS exception */
TRAP_x86_SEGNPFLT = T_SEGNPFLT, /* Segment not present exception */
TRAP_x86_STKFLT = T_STKFLT, /* Stack fault */
TRAP_x86_PROTFLT = T_PROTFLT, /* General protection fault */
TRAP_x86_PAGEFLT = T_PAGEFLT, /* Page fault */
TRAP_x86_ARITHTRAP = T_ARITHTRAP, /* Floating point exception */
TRAP_x86_ALIGNFLT = T_ALIGNFLT, /* Alignment check exception */
TRAP_x86_MCHK = T_MCHK, /* Machine check exception */
TRAP_x86_CACHEFLT = T_XMMFLT /* Cache flush exception */
#else
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 /* SIMD exception (via SIGFPE) if CPU is SSE capable
otherwise Cache flush exception (via SIGSEV) */
#endif
};
/* Exception record for handling exceptions happening inside exception handlers */
typedef struct
{
EXCEPTION_REGISTRATION_RECORD frame;
EXCEPTION_REGISTRATION_RECORD *prevFrame;
} EXC_NESTED_FRAME;
extern DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher,
PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler );
/***********************************************************************
* dispatch_signal
*/
static inline 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);
}
/*******************************************************************
* is_valid_frame
*/
static inline BOOL is_valid_frame( void *frame )
{
if ((ULONG_PTR)frame & 3) return FALSE;
return (frame >= NtCurrentTeb()->Tib.StackLimit &&
(void **)frame < (void **)NtCurrentTeb()->Tib.StackBase - 1);
}
/*******************************************************************
* raise_handler
*
* Handler for exceptions happening inside a handler.
*/
static DWORD raise_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
return ExceptionContinueSearch;
/* We shouldn't get here so we store faulty frame in dispatcher */
*dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
return ExceptionNestedException;
}
/*******************************************************************
* unwind_handler
*
* Handler for exceptions happening inside an unwind handler.
*/
static DWORD unwind_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
return ExceptionContinueSearch;
/* We shouldn't get here so we store faulty frame in dispatcher */
*dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
return ExceptionCollidedUnwind;
}
/**********************************************************************
* call_stack_handlers
*
* Call the stack handlers chain.
*/
static NTSTATUS call_stack_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
{
EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
DWORD res;
frame = NtCurrentTeb()->Tib.ExceptionList;
nested_frame = NULL;
while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
{
/* Check frame address */
if (!is_valid_frame( frame ))
{
rec->ExceptionFlags |= EH_STACK_INVALID;
break;
}
/* Call handler */
TRACE( "calling handler at %p code=%x flags=%x\n",
frame->Handler, rec->ExceptionCode, rec->ExceptionFlags );
res = EXC_CallHandler( rec, frame, context, &dispatch, frame->Handler, raise_handler );
TRACE( "handler at %p returned %x\n", frame->Handler, res );
if (frame == nested_frame)
{
/* no longer nested */
nested_frame = NULL;
rec->ExceptionFlags &= ~EH_NESTED_CALL;
}
switch(res)
{
case ExceptionContinueExecution:
if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return STATUS_SUCCESS;
return STATUS_NONCONTINUABLE_EXCEPTION;
case ExceptionContinueSearch:
break;
case ExceptionNestedException:
if (nested_frame < dispatch) nested_frame = dispatch;
rec->ExceptionFlags |= EH_NESTED_CALL;
break;
default:
return STATUS_INVALID_DISPOSITION;
}
frame = frame->Prev;
}
return STATUS_UNHANDLED_EXCEPTION;
}
/*******************************************************************
* raise_exception
*
* Implementation of NtRaiseException.
*/
static NTSTATUS raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
{
NTSTATUS status;
if (first_chance)
{
DWORD c;
TRACE( "code=%x flags=%x addr=%p ip=%08x tid=%04x\n",
rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
context->Eip, GetCurrentThreadId() );
for (c = 0; c < rec->NumberParameters; c++)
TRACE( " info[%d]=%08lx\n", c, rec->ExceptionInformation[c] );
if (rec->ExceptionCode == EXCEPTION_WINE_STUB)
{
if (rec->ExceptionInformation[1] >> 16)
MESSAGE( "wine: Call from %p to unimplemented function %s.%s, aborting\n",
rec->ExceptionAddress,
(char*)rec->ExceptionInformation[0], (char*)rec->ExceptionInformation[1] );
else
MESSAGE( "wine: Call from %p to unimplemented function %s.%ld, aborting\n",
rec->ExceptionAddress,
(char*)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
}
else
{
TRACE(" eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n",
context->Eax, context->Ebx, context->Ecx,
context->Edx, context->Esi, context->Edi );
TRACE(" ebp=%08x esp=%08x cs=%04x ds=%04x es=%04x fs=%04x gs=%04x flags=%08x\n",
context->Ebp, context->Esp, context->SegCs, context->SegDs,
context->SegEs, context->SegFs, context->SegGs, context->EFlags );
}
status = send_debug_event( rec, TRUE, context );
if (status == DBG_CONTINUE || status == DBG_EXCEPTION_HANDLED)
return STATUS_SUCCESS;
/* fix up instruction pointer in context for EXCEPTION_BREAKPOINT */
if (rec->ExceptionCode == EXCEPTION_BREAKPOINT) context->Eip--;
if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION)
return STATUS_SUCCESS;
if ((status = call_stack_handlers( rec, context )) != STATUS_UNHANDLED_EXCEPTION)
return status;
}
/* last chance exception */
status = send_debug_event( rec, FALSE, context );
if (status != DBG_CONTINUE)
{
if (rec->ExceptionFlags & EH_STACK_INVALID)
WINE_ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
else if (rec->ExceptionCode == STATUS_NONCONTINUABLE_EXCEPTION)
WINE_ERR("Process attempted to continue execution after noncontinuable exception.\n");
else
WINE_ERR("Unhandled exception code %x flags %x addr %p\n",
rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
NtTerminateProcess( NtCurrentProcess(), rec->ExceptionCode );
}
return STATUS_SUCCESS;
}
#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->ContextFlags = CONTEXT_FULL;
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 && get_vm86_teb_info()->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_FLAG)
{
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_FLAG;
get_vm86_teb_info()->vm86_pending = 0;
raise_exception( rec, &vcontext, TRUE );
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 |= get_vm86_teb_info()->vm86_pending;
}
#endif /* __HAVE_VM86 */
#ifdef __sun
/* We have to workaround two Solaris breakages:
* - Solaris doesn't restore %ds and %es before calling the signal handler so exceptions in 16-bit
* code crash badly.
* - Solaris inserts a libc trampoline to call our handler, but the trampoline expects that registers
* are setup correctly. So we need to insert our own trampoline below the libc trampoline to set %gs.
*/
extern int sigaction_syscall( int sig, const struct sigaction *new, struct sigaction *old );
__ASM_GLOBAL_FUNC( sigaction_syscall,
"movl $0x62,%eax\n\t"
"int $0x91\n\t"
"ret" )
/* assume the same libc handler is used for all signals */
static void (*libc_sigacthandler)( int signal, siginfo_t *siginfo, void *context );
static void wine_sigacthandler( int signal, siginfo_t *siginfo, void *sigcontext )
{
struct ntdll_thread_data *thread_data;
__asm__ __volatile__("mov %ss,%ax; mov %ax,%ds; mov %ax,%es");
thread_data = (struct ntdll_thread_data *)get_current_teb()->SpareBytes1;
wine_set_fs( thread_data->fs );
wine_set_gs( thread_data->gs );
libc_sigacthandler( signal, siginfo, sigcontext );
}
static int solaris_sigaction( int sig, const struct sigaction *new, struct sigaction *old )
{
struct sigaction real_act;
if (sigaction( sig, new, old ) == -1) return -1;
/* retrieve the real handler and flags with a direct syscall */
sigaction_syscall( sig, NULL, &real_act );
libc_sigacthandler = real_act.sa_sigaction;
real_act.sa_sigaction = wine_sigacthandler;
sigaction_syscall( sig, &real_act, NULL );
return 0;
}
#define sigaction(sig,new,old) solaris_sigaction(sig,new,old)
#endif
typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
extern void clear_alignment_flag(void);
__ASM_GLOBAL_FUNC( clear_alignment_flag,
"pushfl\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"andl $~0x40000,(%esp)\n\t"
"popfl\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
"ret" )
/***********************************************************************
* init_handler
*
* Handler initialization when the full context is not needed.
* Return the stack pointer to use for pushing the exception data.
*/
static inline void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
{
TEB *teb = get_current_teb();
clear_alignment_flag();
/* 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
#ifndef __sun /* see above for Solaris handling */
{
struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SpareBytes1;
wine_set_fs( thread_data->fs );
wine_set_gs( thread_data->gs );
}
#endif
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.
*/
return teb->WOW32Reserved;
}
return (void *)(ESP_sig(sigcontext) & ~3);
}
/***********************************************************************
* save_fpu
*
* Save the thread FPU context.
*/
static inline void save_fpu( CONTEXT *context )
{
#ifdef __GNUC__
context->ContextFlags |= CONTEXT_FLOATING_POINT;
__asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
#endif
}
/***********************************************************************
* save_fpux
*
* Save the thread FPU extended context.
*/
static inline void save_fpux( CONTEXT *context )
{
#ifdef __GNUC__
/* we have to enforce alignment by hand */
char buffer[sizeof(XMM_SAVE_AREA32) + 16];
XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
__asm__ __volatile__( "fxsave %0" : "=m" (*state) );
context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
memcpy( context->ExtendedRegisters, state, sizeof(*state) );
#endif
}
/***********************************************************************
* restore_fpu
*
* Restore the FPU context to a sigcontext.
*/
static inline 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__ */
}
/***********************************************************************
* restore_fpux
*
* Restore the FPU extended context to a sigcontext.
*/
static inline void restore_fpux( const CONTEXT *context )
{
#ifdef __GNUC__
/* we have to enforce alignment by hand */
char buffer[sizeof(XMM_SAVE_AREA32) + 16];
XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
memcpy( state, context->ExtendedRegisters, sizeof(*state) );
/* reset the current interrupt status */
state->StatusWord &= state->ControlWord | 0xff80;
__asm__ __volatile__( "fxrstor %0" : : "m" (*state) );
#endif
}
/***********************************************************************
* fpux_to_fpu
*
* Build a standard FPU context from an extended one.
*/
static void fpux_to_fpu( FLOATING_SAVE_AREA *fpu, const XMM_SAVE_AREA32 *fpux )
{
unsigned int i, tag, stack_top;
fpu->ControlWord = fpux->ControlWord | 0xffff0000;
fpu->StatusWord = fpux->StatusWord | 0xffff0000;
fpu->ErrorOffset = fpux->ErrorOffset;
fpu->ErrorSelector = fpux->ErrorSelector | (fpux->ErrorOpcode << 16);
fpu->DataOffset = fpux->DataOffset;
fpu->DataSelector = fpux->DataSelector;
fpu->Cr0NpxState = fpux->StatusWord | 0xffff0000;
stack_top = (fpux->StatusWord >> 11) & 7;
fpu->TagWord = 0xffff0000;
for (i = 0; i < 8; i++)
{
memcpy( &fpu->RegisterArea[10 * i], &fpux->FloatRegisters[i], 10 );
if (!(fpux->TagWord & (1 << i))) tag = 3; /* empty */
else
{
const M128A *reg = &fpux->FloatRegisters[(i - stack_top) & 7];
if ((reg->High & 0x7fff) == 0x7fff) /* exponent all ones */
{
tag = 2; /* special */
}
else if (!(reg->High & 0x7fff)) /* exponent all zeroes */
{
if (reg->Low) tag = 2; /* special */
else tag = 1; /* zero */
}
else
{
if (reg->Low >> 63) tag = 0; /* valid */
else tag = 2; /* special */
}
}
fpu->TagWord |= tag << (2 * i);
}
}
/***********************************************************************
* save_context
*
* Build a context structure from the signal info.
*/
static inline void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
{
struct ntdll_thread_data * const regs = ntdll_get_thread_data();
FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
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;
if (fpu)
{
context->ContextFlags |= CONTEXT_FLOATING_POINT;
context->FloatSave = *fpu;
}
if (fpux)
{
context->ContextFlags |= CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) );
fpux_support = 1;
if (!fpu) fpux_to_fpu( &context->FloatSave, fpux );
}
if (!fpu && !fpux) save_fpu( context );
}
/***********************************************************************
* restore_context
*
* Restore the signal info from the context.
*/
static inline void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
{
struct ntdll_thread_data * const regs = ntdll_get_thread_data();
FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
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
if (fpu) *fpu = context->FloatSave;
if (fpux) memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) );
if (!fpu && !fpux) restore_fpu( context );
}
/***********************************************************************
* RtlCaptureContext (NTDLL.@)
*/
__ASM_STDCALL_FUNC( RtlCaptureContext, 4,
"pushl %eax\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"movl 8(%esp),%eax\n\t" /* context */
"movl $0x10007,(%eax)\n\t" /* context->ContextFlags */
"movw %gs,0x8c(%eax)\n\t" /* context->SegGs */
"movw %fs,0x90(%eax)\n\t" /* context->SegFs */
"movw %es,0x94(%eax)\n\t" /* context->SegEs */
"movw %ds,0x98(%eax)\n\t" /* context->SegDs */
"movl %edi,0x9c(%eax)\n\t" /* context->Edi */
"movl %esi,0xa0(%eax)\n\t" /* context->Esi */
"movl %ebx,0xa4(%eax)\n\t" /* context->Ebx */
"movl %edx,0xa8(%eax)\n\t" /* context->Edx */
"movl %ecx,0xac(%eax)\n\t" /* context->Ecx */
"movl %ebp,0xb4(%eax)\n\t" /* context->Ebp */
"movl 4(%esp),%edx\n\t"
"movl %edx,0xb8(%eax)\n\t" /* context->Eip */
"movw %cs,0xbc(%eax)\n\t" /* context->SegCs */
"pushfl\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"popl 0xc0(%eax)\n\t" /* context->EFlags */
__ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
"leal 8(%esp),%edx\n\t"
"movl %edx,0xc4(%eax)\n\t" /* context->Esp */
"movw %ss,0xc8(%eax)\n\t" /* context->SegSs */
"popl 0xb0(%eax)\n\t" /* context->Eax */
__ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
"ret $4" )
/***********************************************************************
* 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_EXTENDED_REGISTERS) && fpux_support) restore_fpux( context );
else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
if (flags & CONTEXT_DEBUG_REGISTERS)
{
ntdll_get_thread_data()->dr0 = context->Dr0;
ntdll_get_thread_data()->dr1 = context->Dr1;
ntdll_get_thread_data()->dr2 = context->Dr2;
ntdll_get_thread_data()->dr3 = context->Dr3;
ntdll_get_thread_data()->dr6 = context->Dr6;
ntdll_get_thread_data()->dr7 = context->Dr7;
}
if (flags & CONTEXT_FULL)
{
if (!(flags & CONTEXT_CONTROL))
FIXME( "setting partial context (%x) not supported\n", flags );
else if (flags & CONTEXT_SEGMENTS)
__wine_restore_regs( context );
else
{
CONTEXT newcontext = *context;
newcontext.SegDs = wine_get_ds();
newcontext.SegEs = wine_get_es();
newcontext.SegFs = wine_get_fs();
newcontext.SegGs = wine_get_gs();
__wine_restore_regs( &newcontext );
}
}
}
/***********************************************************************
* set_debug_registers
*/
static void set_debug_registers( const CONTEXT *context )
{
DWORD flags = context->ContextFlags & ~CONTEXT_i386;
context_t server_context;
if (!(flags & CONTEXT_DEBUG_REGISTERS)) return;
if (ntdll_get_thread_data()->dr0 == context->Dr0 &&
ntdll_get_thread_data()->dr1 == context->Dr1 &&
ntdll_get_thread_data()->dr2 == context->Dr2 &&
ntdll_get_thread_data()->dr3 == context->Dr3 &&
ntdll_get_thread_data()->dr6 == context->Dr6 &&
ntdll_get_thread_data()->dr7 == context->Dr7) return;
context_to_server( &server_context, context );
SERVER_START_REQ( set_thread_context )
{
req->handle = wine_server_obj_handle( GetCurrentThread() );
req->suspend = 0;
wine_server_add_data( req, &server_context, sizeof(server_context) );
wine_server_call( req );
}
SERVER_END_REQ;
}
/***********************************************************************
* copy_context
*
* Copy a register context according to the flags.
*/
void copy_context( CONTEXT *to, const CONTEXT *from, DWORD flags )
{
flags &= ~CONTEXT_i386; /* get rid of CPU id */
if (flags & CONTEXT_INTEGER)
{
to->Eax = from->Eax;
to->Ebx = from->Ebx;
to->Ecx = from->Ecx;
to->Edx = from->Edx;
to->Esi = from->Esi;
to->Edi = from->Edi;
}
if (flags & CONTEXT_CONTROL)
{
to->Ebp = from->Ebp;
to->Esp = from->Esp;
to->Eip = from->Eip;
to->SegCs = from->SegCs;
to->SegSs = from->SegSs;
to->EFlags = from->EFlags;
}
if (flags & CONTEXT_SEGMENTS)
{
to->SegDs = from->SegDs;
to->SegEs = from->SegEs;
to->SegFs = from->SegFs;
to->SegGs = from->SegGs;
}
if (flags & CONTEXT_DEBUG_REGISTERS)
{
to->Dr0 = from->Dr0;
to->Dr1 = from->Dr1;
to->Dr2 = from->Dr2;
to->Dr3 = from->Dr3;
to->Dr6 = from->Dr6;
to->Dr7 = from->Dr7;
}
if (flags & CONTEXT_FLOATING_POINT)
{
to->FloatSave = from->FloatSave;
}
if (flags & CONTEXT_EXTENDED_REGISTERS)
{
memcpy( to->ExtendedRegisters, from->ExtendedRegisters, sizeof(to->ExtendedRegisters) );
}
}
/***********************************************************************
* context_to_server
*
* Convert a register context to the server format.
*/
NTSTATUS context_to_server( context_t *to, const CONTEXT *from )
{
DWORD flags = from->ContextFlags & ~CONTEXT_i386; /* get rid of CPU id */
memset( to, 0, sizeof(*to) );
to->cpu = CPU_x86;
if (flags & CONTEXT_CONTROL)
{
to->flags |= SERVER_CTX_CONTROL;
to->ctl.i386_regs.ebp = from->Ebp;
to->ctl.i386_regs.esp = from->Esp;
to->ctl.i386_regs.eip = from->Eip;
to->ctl.i386_regs.cs = from->SegCs;
to->ctl.i386_regs.ss = from->SegSs;
to->ctl.i386_regs.eflags = from->EFlags;
}
if (flags & CONTEXT_INTEGER)
{
to->flags |= SERVER_CTX_INTEGER;
to->integer.i386_regs.eax = from->Eax;
to->integer.i386_regs.ebx = from->Ebx;
to->integer.i386_regs.ecx = from->Ecx;
to->integer.i386_regs.edx = from->Edx;
to->integer.i386_regs.esi = from->Esi;
to->integer.i386_regs.edi = from->Edi;
}
if (flags & CONTEXT_SEGMENTS)
{
to->flags |= SERVER_CTX_SEGMENTS;
to->seg.i386_regs.ds = from->SegDs;
to->seg.i386_regs.es = from->SegEs;
to->seg.i386_regs.fs = from->SegFs;
to->seg.i386_regs.gs = from->SegGs;
}
if (flags & CONTEXT_FLOATING_POINT)
{
to->flags |= SERVER_CTX_FLOATING_POINT;
to->fp.i386_regs.ctrl = from->FloatSave.ControlWord;
to->fp.i386_regs.status = from->FloatSave.StatusWord;
to->fp.i386_regs.tag = from->FloatSave.TagWord;
to->fp.i386_regs.err_off = from->FloatSave.ErrorOffset;
to->fp.i386_regs.err_sel = from->FloatSave.ErrorSelector;
to->fp.i386_regs.data_off = from->FloatSave.DataOffset;
to->fp.i386_regs.data_sel = from->FloatSave.DataSelector;
to->fp.i386_regs.cr0npx = from->FloatSave.Cr0NpxState;
memcpy( to->fp.i386_regs.regs, from->FloatSave.RegisterArea, sizeof(to->fp.i386_regs.regs) );
}
if (flags & CONTEXT_DEBUG_REGISTERS)
{
to->flags |= SERVER_CTX_DEBUG_REGISTERS;
to->debug.i386_regs.dr0 = from->Dr0;
to->debug.i386_regs.dr1 = from->Dr1;
to->debug.i386_regs.dr2 = from->Dr2;
to->debug.i386_regs.dr3 = from->Dr3;
to->debug.i386_regs.dr6 = from->Dr6;
to->debug.i386_regs.dr7 = from->Dr7;
}
if (flags & CONTEXT_EXTENDED_REGISTERS)
{
to->flags |= SERVER_CTX_EXTENDED_REGISTERS;
memcpy( to->ext.i386_regs, from->ExtendedRegisters, sizeof(to->ext.i386_regs) );
}
return STATUS_SUCCESS;
}
/***********************************************************************
* context_from_server
*
* Convert a register context from the server format.
*/
NTSTATUS context_from_server( CONTEXT *to, const context_t *from )
{
if (from->cpu != CPU_x86) return STATUS_INVALID_PARAMETER;
to->ContextFlags = CONTEXT_i386;
if (from->flags & SERVER_CTX_CONTROL)
{
to->ContextFlags |= CONTEXT_CONTROL;
to->Ebp = from->ctl.i386_regs.ebp;
to->Esp = from->ctl.i386_regs.esp;
to->Eip = from->ctl.i386_regs.eip;
to->SegCs = from->ctl.i386_regs.cs;
to->SegSs = from->ctl.i386_regs.ss;
to->EFlags = from->ctl.i386_regs.eflags;
}
if (from->flags & SERVER_CTX_INTEGER)
{
to->ContextFlags |= CONTEXT_INTEGER;
to->Eax = from->integer.i386_regs.eax;
to->Ebx = from->integer.i386_regs.ebx;
to->Ecx = from->integer.i386_regs.ecx;
to->Edx = from->integer.i386_regs.edx;
to->Esi = from->integer.i386_regs.esi;
to->Edi = from->integer.i386_regs.edi;
}
if (from->flags & SERVER_CTX_SEGMENTS)
{
to->ContextFlags |= CONTEXT_SEGMENTS;
to->SegDs = from->seg.i386_regs.ds;
to->SegEs = from->seg.i386_regs.es;
to->SegFs = from->seg.i386_regs.fs;
to->SegGs = from->seg.i386_regs.gs;
}
if (from->flags & SERVER_CTX_FLOATING_POINT)
{
to->ContextFlags |= CONTEXT_FLOATING_POINT;
to->FloatSave.ControlWord = from->fp.i386_regs.ctrl;
to->FloatSave.StatusWord = from->fp.i386_regs.status;
to->FloatSave.TagWord = from->fp.i386_regs.tag;
to->FloatSave.ErrorOffset = from->fp.i386_regs.err_off;
to->FloatSave.ErrorSelector = from->fp.i386_regs.err_sel;
to->FloatSave.DataOffset = from->fp.i386_regs.data_off;
to->FloatSave.DataSelector = from->fp.i386_regs.data_sel;
to->FloatSave.Cr0NpxState = from->fp.i386_regs.cr0npx;
memcpy( to->FloatSave.RegisterArea, from->fp.i386_regs.regs, sizeof(to->FloatSave.RegisterArea) );
}
if (from->flags & SERVER_CTX_DEBUG_REGISTERS)
{
to->ContextFlags |= CONTEXT_DEBUG_REGISTERS;
to->Dr0 = from->debug.i386_regs.dr0;
to->Dr1 = from->debug.i386_regs.dr1;
to->Dr2 = from->debug.i386_regs.dr2;
to->Dr3 = from->debug.i386_regs.dr3;
to->Dr6 = from->debug.i386_regs.dr6;
to->Dr7 = from->debug.i386_regs.dr7;
}
if (from->flags & SERVER_CTX_EXTENDED_REGISTERS)
{
to->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
memcpy( to->ExtendedRegisters, from->ext.i386_regs, sizeof(to->ExtendedRegisters) );
}
return STATUS_SUCCESS;
}
/***********************************************************************
* 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 DWORD is_privileged_instr( CONTEXT *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 EXCEPTION_ILLEGAL_INSTRUCTION;
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 EXCEPTION_PRIV_INSTRUCTION;
}
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 EXCEPTION_PRIV_INSTRUCTION;
default:
return 0;
}
}
#include "pshpack1.h"
struct atl_thunk
{
DWORD movl; /* movl this,4(%esp) */
DWORD this;
BYTE jmp; /* jmp func */
int func;
};
#include "poppack.h"
/**********************************************************************
* check_atl_thunk
*
* Check if code destination is an ATL thunk, and emulate it if so.
*/
static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context )
{
const struct atl_thunk *thunk = (const struct atl_thunk *)rec->ExceptionInformation[1];
BOOL ret = FALSE;
__TRY
{
if (thunk->movl == 0x042444c7 && thunk->jmp == 0xe9)
{
*((DWORD *)context->Esp + 1) = thunk->this;
context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func;
TRACE( "emulating ATL thunk at %p, func=%08x arg=%08x\n",
thunk, context->Eip, *((DWORD *)context->Esp + 1) );
ret = TRUE;
}
}
__EXCEPT_PAGE_FAULT
{
return FALSE;
}
__ENDTRY
return ret;
}
/***********************************************************************
* setup_exception_record
*
* Setup the exception record and context on the thread stack.
*/
static EXCEPTION_RECORD *setup_exception_record( SIGCONTEXT *sigcontext, void *stack_ptr,
WORD fs, WORD gs, 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 = stack_ptr;
DWORD exception_code = 0;
/* stack sanity checks */
if ((char *)stack >= (char *)get_signal_stack() &&
(char *)stack < (char *)get_signal_stack() + signal_stack_size)
{
WINE_ERR( "nested exception on signal stack in thread %04x eip %08x esp %08x stack %p-%p\n",
GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
(unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
NtCurrentTeb()->Tib.StackBase );
abort_thread(1);
}
if (stack - 1 > stack || /* check for overflow in subtraction */
(char *)stack <= (char *)NtCurrentTeb()->DeallocationStack ||
(char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
{
WARN( "exception outside of stack limits in thread %04x eip %08x esp %08x stack %p-%p\n",
GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
(unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
NtCurrentTeb()->Tib.StackBase );
}
else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->DeallocationStack + 4096)
{
/* stack overflow on last page, unrecoverable */
UINT diff = (char *)NtCurrentTeb()->DeallocationStack + 4096 - (char *)(stack - 1);
WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
(unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
abort_thread(1);
}
else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit)
{
/* stack access below stack limit, may be recoverable */
if (virtual_handle_stack_fault( stack - 1 )) exception_code = EXCEPTION_STACK_OVERFLOW;
else
{
UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)(stack - 1);
WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
(unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
abort_thread(1);
}
}
stack--; /* push the stack_layout structure */
#if defined(VALGRIND_MAKE_MEM_UNDEFINED)
VALGRIND_MAKE_MEM_UNDEFINED(stack, sizeof(*stack));
#elif defined(VALGRIND_MAKE_WRITABLE)
VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack));
#endif
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.ExceptionCode = exception_code;
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;
/* clear single-step, direction, and align check flag */
EFL_sig(sigcontext) &= ~(0x100|0x400|0x40000);
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;
}
/***********************************************************************
* 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 )
{
WORD fs, gs;
void *stack = init_handler( sigcontext, &fs, &gs );
return setup_exception_record( sigcontext, stack, fs, gs, func );
}
/***********************************************************************
* 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 & ~(context->FloatSave.ControlWord & 0x3f);
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 )
{
NTSTATUS status;
switch(rec->ExceptionCode)
{
case EXCEPTION_ACCESS_VIOLATION:
if (rec->NumberParameters == 2)
{
if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT && check_atl_thunk( rec, context ))
goto done;
if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
rec->ExceptionInformation[0] )))
goto done;
/* send EXCEPTION_EXECUTE_FAULT only if data execution prevention is enabled */
if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT)
{
ULONG flags;
NtQueryInformationProcess( GetCurrentProcess(), ProcessExecuteFlags,
&flags, sizeof(flags), NULL );
if (!(flags & MEM_EXECUTE_OPTION_DISABLE))
rec->ExceptionInformation[0] = EXCEPTION_READ_FAULT;
}
}
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;
}
status = NtRaiseException( rec, context, TRUE );
raise_status( status, rec );
done:
set_cpu_context( context );
}
/**********************************************************************
* raise_trap_exception
*/
static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
{
NTSTATUS status;
if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
{
/* when single stepping can't tell whether this is a hw bp or a
* single step interrupt. try to avoid as much overhead as possible
* and only do a server call if there is any hw bp enabled. */
if( !(context->EFlags & 0x100) || (ntdll_get_thread_data()->dr7 & 0xff) )
{
/* (possible) hardware breakpoint, fetch the debug registers */
context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
NtGetContextThread(GetCurrentThread(), context);
context->ContextFlags |= CONTEXT_FULL; /* restore flags */
}
context->EFlags &= ~0x100; /* clear single-step flag */
}
status = NtRaiseException( rec, context, TRUE );
raise_status( status, rec );
}
/**********************************************************************
* raise_generic_exception
*
* Generic raise function for exceptions that don't need special treatment.
*/
static void WINAPI raise_generic_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
{
NTSTATUS status;
status = NtRaiseException( rec, context, TRUE );
raise_status( status, rec );
}
#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 */
get_vm86_teb_info()->vm86_pending |= VIP_FLAG;
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 (get_vm86_teb_info()->dpmi_vif &&
!wine_ldt_is_system(context->SegCs) &&
!wine_ldt_is_system(context->SegSs))
{
/* Executing DPMI code and virtual interrupts are enabled. */
get_vm86_teb_info()->vm86_pending = 0;
NtRaiseException( rec, context, TRUE );
}
done:
set_cpu_context( context );
}
/**********************************************************************
* usr2_handler
*
* Handler for SIGUSR2.
* We use it to signal that the running __wine_enter_vm86() should
* immediately set VIP_FLAG, causing pending events to be handled
* as early as possible.
*/
static void usr2_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_vm86_sti_exception );
rec->ExceptionCode = EXCEPTION_VM86_STI;
}
#endif /* __HAVE_VM86 */
/**********************************************************************
* segv_handler
*
* Handler for SIGSEGV and related errors.
*/
static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
WORD fs, gs;
EXCEPTION_RECORD *rec;
SIGCONTEXT *context = sigcontext;
void *stack = init_handler( sigcontext, &fs, &gs );
/* check for page fault inside the thread stack */
if (get_trap_code(context) == TRAP_x86_PAGEFLT &&
(char *)siginfo->si_addr >= (char *)NtCurrentTeb()->DeallocationStack &&
(char *)siginfo->si_addr < (char *)NtCurrentTeb()->Tib.StackBase &&
virtual_handle_stack_fault( siginfo->si_addr ))
{
/* check if this was the last guard page */
if ((char *)siginfo->si_addr < (char *)NtCurrentTeb()->DeallocationStack + 2*4096)
{
rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
}
return;
}
rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return;
switch(get_trap_code(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 */
{
WORD err = get_error_code(context);
if (!err && (rec->ExceptionCode = is_privileged_instr( get_exception_context(rec) ))) break;
rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
rec->NumberParameters = 2;
rec->ExceptionInformation[0] = 0;
/* if error contains a LDT selector, use that as fault address */
if ((err & 7) == 4 && !wine_ldt_is_system( err | 7 ))
rec->ExceptionInformation[1] = err & ~7;
else
rec->ExceptionInformation[1] = 0xffffffff;
}
break;
case TRAP_x86_PAGEFLT: /* Page fault */
rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
rec->NumberParameters = 2;
rec->ExceptionInformation[0] = (get_error_code(context) >> 1) & 0x09;
rec->ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
break;
case TRAP_x86_ALIGNFLT: /* Alignment check exception */
rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
break;
default:
WINE_ERR( "Got unexpected trap %d\n", get_trap_code(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 void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
SIGCONTEXT *context = sigcontext;
EXCEPTION_RECORD *rec = setup_exception( context, raise_trap_exception );
switch(get_trap_code(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 void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
CONTEXT *win_context;
SIGCONTEXT *context = sigcontext;
EXCEPTION_RECORD *rec = setup_exception( context, raise_generic_exception );
win_context = get_exception_context( rec );
switch(get_trap_code(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( win_context );
rec->ExceptionAddress = (LPVOID)win_context->FloatSave.ErrorOffset;
break;
case TRAP_x86_CACHEFLT: /* SIMD exception */
/* TODO:
* Behaviour only tested for divide-by-zero exceptions
* Check for other SIMD exceptions as well */
if(siginfo->si_code != FPE_FLTDIV)
FIXME("untested SIMD exception: %#x. Might not work correctly\n",
siginfo->si_code);
rec->ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS;
rec->NumberParameters = 1;
/* no idea what meaning is actually behind this but that's what native does */
rec->ExceptionInformation[0] = 0;
break;
default:
WINE_ERR( "Got unexpected trap %d\n", get_trap_code(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 void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
WORD fs, gs;
init_handler( sigcontext, &fs, &gs );
if (!dispatch_signal(SIGINT))
{
EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_generic_exception );
rec->ExceptionCode = CONTROL_C_EXIT;
}
}
/**********************************************************************
* abrt_handler
*
* Handler for SIGABRT.
*/
static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_generic_exception );
rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
rec->ExceptionFlags = EH_NONCONTINUABLE;
}
/**********************************************************************
* quit_handler
*
* Handler for SIGQUIT.
*/
static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
WORD fs, gs;
init_handler( sigcontext, &fs, &gs );
abort_thread(0);
}
/**********************************************************************
* usr1_handler
*
* Handler for SIGUSR1, used to signal a thread that it got suspended.
*/
static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
CONTEXT context;
WORD fs, gs;
init_handler( sigcontext, &fs, &gs );
save_context( &context, sigcontext, fs, gs );
wait_suspend( &context );
restore_context( &context, sigcontext );
}
/***********************************************************************
* __wine_set_signal_handler (NTDLL.@)
*/
int CDECL __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;
}
/***********************************************************************
* locking for LDT routines
*/
static RTL_CRITICAL_SECTION ldt_section;
static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
{
0, 0, &ldt_section,
{ &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
0, 0, { (DWORD_PTR)(__FILE__ ": ldt_section") }
};
static RTL_CRITICAL_SECTION ldt_section = { &critsect_debug, -1, 0, 0, 0, 0 };
static sigset_t ldt_sigset;
static void ldt_lock(void)
{
sigset_t sigset;
pthread_sigmask( SIG_BLOCK, &server_block_set, &sigset );
RtlEnterCriticalSection( &ldt_section );
if (ldt_section.RecursionCount == 1) ldt_sigset = sigset;
}
static void ldt_unlock(void)
{
if (ldt_section.RecursionCount == 1)
{
sigset_t sigset = ldt_sigset;
RtlLeaveCriticalSection( &ldt_section );
pthread_sigmask( SIG_SETMASK, &sigset, NULL );
}
else RtlLeaveCriticalSection( &ldt_section );
}
/**********************************************************************
* signal_alloc_thread
*/
NTSTATUS signal_alloc_thread( TEB **teb )
{
static size_t sigstack_zero_bits;
struct ntdll_thread_data *thread_data;
struct ntdll_thread_data *parent_data = NULL;
SIZE_T size;
void *addr = NULL;
NTSTATUS status;
if (!sigstack_zero_bits)
{
size_t min_size = teb_size + max( MINSIGSTKSZ, 8192 );
/* find the first power of two not smaller than min_size */
sigstack_zero_bits = 12;
while ((1u << sigstack_zero_bits) < min_size) sigstack_zero_bits++;
signal_stack_mask = (1 << sigstack_zero_bits) - 1;
signal_stack_size = (1 << sigstack_zero_bits) - teb_size;
}
else parent_data = ntdll_get_thread_data();
size = signal_stack_mask + 1;
if (!(status = NtAllocateVirtualMemory( NtCurrentProcess(), &addr, sigstack_zero_bits,
&size, MEM_COMMIT | MEM_TOP_DOWN, PAGE_READWRITE )))
{
*teb = addr;
(*teb)->Tib.Self = &(*teb)->Tib;
(*teb)->Tib.ExceptionList = (void *)~0UL;
thread_data = (struct ntdll_thread_data *)(*teb)->SpareBytes1;
if (!(thread_data->fs = wine_ldt_alloc_fs()))
{
size = 0;
NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE );
status = STATUS_TOO_MANY_THREADS;
}
if (parent_data)
{
/* inherit debug registers from parent thread */
thread_data->dr0 = parent_data->dr0;
thread_data->dr1 = parent_data->dr1;
thread_data->dr2 = parent_data->dr2;
thread_data->dr3 = parent_data->dr3;
thread_data->dr6 = parent_data->dr6;
thread_data->dr7 = parent_data->dr7;
}
}
return status;
}
/**********************************************************************
* signal_free_thread
*/
void signal_free_thread( TEB *teb )
{
SIZE_T size;
struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SpareBytes1;
if (thread_data) wine_ldt_free_fs( thread_data->fs );
if (teb->DeallocationStack)
{
size = 0;
NtFreeVirtualMemory( GetCurrentProcess(), &teb->DeallocationStack, &size, MEM_RELEASE );
}
size = 0;
NtFreeVirtualMemory( NtCurrentProcess(), (void **)&teb, &size, MEM_RELEASE );
}
/**********************************************************************
* signal_init_thread
*/
void signal_init_thread( TEB *teb )
{
const WORD fpu_cw = 0x27f;
struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SpareBytes1;
LDT_ENTRY fs_entry;
stack_t ss;
#ifdef __APPLE__
int mib[2], val = 1;
mib[0] = CTL_KERN;
mib[1] = KERN_THALTSTACK;
sysctl( mib, 2, NULL, NULL, &val, sizeof(val) );
#endif
ss.ss_sp = (char *)teb + teb_size;
ss.ss_size = signal_stack_size;
ss.ss_flags = 0;
if (sigaltstack(&ss, NULL) == -1) perror( "sigaltstack" );
wine_ldt_set_base( &fs_entry, teb );
wine_ldt_set_limit( &fs_entry, teb_size - 1 );
wine_ldt_set_flags( &fs_entry, WINE_LDT_FLAGS_DATA|WINE_LDT_FLAGS_32BIT );
wine_ldt_init_fs( thread_data->fs, &fs_entry );
thread_data->gs = wine_get_gs();
#ifdef __GNUC__
__asm__ volatile ("fninit; fldcw %0" : : "m" (fpu_cw));
#else
FIXME("FPU setup not implemented for this platform.\n");
#endif
}
/**********************************************************************
* signal_init_process
*/
void signal_init_process(void)
{
struct sigaction sig_act;
sig_act.sa_mask = server_block_set;
sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
#ifdef SA_ONSTACK
sig_act.sa_flags |= SA_ONSTACK;
#endif
sig_act.sa_sigaction = int_handler;
if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
sig_act.sa_sigaction = fpe_handler;
if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
sig_act.sa_sigaction = abrt_handler;
if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
sig_act.sa_sigaction = quit_handler;
if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
sig_act.sa_sigaction = usr1_handler;
if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
sig_act.sa_sigaction = segv_handler;
if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
#ifdef SIGBUS
if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
#endif
#ifdef SIGTRAP
sig_act.sa_sigaction = trap_handler;
if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
#endif
#ifdef __HAVE_VM86
sig_act.sa_sigaction = usr2_handler;
if (sigaction( SIGUSR2, &sig_act, NULL ) == -1) goto error;
#endif
wine_ldt_init_locking( ldt_lock, ldt_unlock );
return;
error:
perror("sigaction");
exit(1);
}
#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;
break;
case VM86_TRAP: /* return due to DOS-debugger request */
switch(VM86_ARG(res))
{
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;
}
break;
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_FLAG;
context->EFlags &= ~VIP_FLAG;
get_vm86_teb_info()->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:
WINE_ERR( "unhandled result from vm86 mode %x\n", res );
continue;
}
raise_exception( &rec, context, TRUE );
}
}
#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 */
/*******************************************************************
* RtlUnwind (NTDLL.@)
*/
void WINAPI __regs_RtlUnwind( EXCEPTION_REGISTRATION_RECORD* pEndFrame, PVOID targetIp,
PEXCEPTION_RECORD pRecord, PVOID retval, CONTEXT *context )
{
EXCEPTION_RECORD record;
EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
DWORD res;
context->Eax = (DWORD)retval;
/* build an exception record, if we do not have one */
if (!pRecord)
{
record.ExceptionCode = STATUS_UNWIND;
record.ExceptionFlags = 0;
record.ExceptionRecord = NULL;
record.ExceptionAddress = (void *)context->Eip;
record.NumberParameters = 0;
pRecord = &record;
}
pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);
TRACE( "code=%x flags=%x\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );
/* get chain of exception frames */
frame = NtCurrentTeb()->Tib.ExceptionList;
while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != pEndFrame))
{
/* Check frame address */
if (pEndFrame && (frame > pEndFrame))
raise_status( STATUS_INVALID_UNWIND_TARGET, pRecord );
if (!is_valid_frame( frame )) raise_status( STATUS_BAD_STACK, pRecord );
/* Call handler */
TRACE( "calling handler at %p code=%x flags=%x\n",
frame->Handler, pRecord->ExceptionCode, pRecord->ExceptionFlags );
res = EXC_CallHandler( pRecord, frame, context, &dispatch, frame->Handler, unwind_handler );
TRACE( "handler at %p returned %x\n", frame->Handler, res );
switch(res)
{
case ExceptionContinueSearch:
break;
case ExceptionCollidedUnwind:
frame = dispatch;
break;
default:
raise_status( STATUS_INVALID_DISPOSITION, pRecord );
break;
}
frame = __wine_pop_frame( frame );
}
}
DEFINE_REGS_ENTRYPOINT( RtlUnwind, 4 )
/*******************************************************************
* NtRaiseException (NTDLL.@)
*/
NTSTATUS WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
{
NTSTATUS status = raise_exception( rec, context, first_chance );
if (status == STATUS_SUCCESS)
{
set_debug_registers( context );
set_cpu_context( context );
}
return status;
}
/***********************************************************************
* RtlRaiseException (NTDLL.@)
*/
void WINAPI __regs_RtlRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context )
{
NTSTATUS status;
rec->ExceptionAddress = (void *)context->Eip;
status = raise_exception( rec, context, TRUE );
if (status != STATUS_SUCCESS) raise_status( status, rec );
}
DEFINE_REGS_ENTRYPOINT( RtlRaiseException, 1 )
/*************************************************************************
* RtlCaptureStackBackTrace (NTDLL.@)
*/
USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer, ULONG *hash )
{
CONTEXT context;
ULONG i;
ULONG *frame;
RtlCaptureContext( &context );
if (hash) *hash = 0;
frame = (ULONG *)context.Ebp;
while (skip--)
{
if (!is_valid_frame( frame )) return 0;
frame = (ULONG *)*frame;
}
for (i = 0; i < count; i++)
{
if (!is_valid_frame( frame )) break;
buffer[i] = (void *)frame[1];
if (hash) *hash += frame[1];
frame = (ULONG *)*frame;
}
return i;
}
extern void DECLSPEC_NORETURN call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg );
__ASM_GLOBAL_FUNC( call_thread_entry_point,
"pushl %ebp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"pushl %ebx\n\t"
__ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
"pushl %esi\n\t"
__ASM_CFI(".cfi_rel_offset %esi,-8\n\t")
"pushl %edi\n\t"
__ASM_CFI(".cfi_rel_offset %edi,-12\n\t")
"pushl %ebp\n\t"
"pushl 12(%ebp)\n\t"
"pushl 8(%ebp)\n\t"
"call " __ASM_NAME("call_thread_func") );
extern void DECLSPEC_NORETURN call_thread_exit_func( int status, void (*func)(int), void *frame );
__ASM_GLOBAL_FUNC( call_thread_exit_func,
"movl 4(%esp),%eax\n\t"
"movl 8(%esp),%ecx\n\t"
"movl 12(%esp),%ebp\n\t"
__ASM_CFI(".cfi_def_cfa %ebp,4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
__ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
__ASM_CFI(".cfi_rel_offset %esi,-8\n\t")
__ASM_CFI(".cfi_rel_offset %edi,-12\n\t")
"leal -20(%ebp),%esp\n\t"
"pushl %eax\n\t"
"call *%ecx" );
/* wrapper for apps that don't declare the thread function correctly */
extern void DECLSPEC_NORETURN call_thread_func_wrapper( LPTHREAD_START_ROUTINE entry, void *arg );
__ASM_GLOBAL_FUNC(call_thread_func_wrapper,
"pushl %ebp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"subl $4,%esp\n\t"
"pushl 12(%ebp)\n\t"
"call *8(%ebp)\n\t"
"leal -4(%ebp),%esp\n\t"
"pushl %eax\n\t"
"call " __ASM_NAME("exit_thread") "\n\t"
"int $3" )
/***********************************************************************
* call_thread_func
*/
void call_thread_func( LPTHREAD_START_ROUTINE entry, void *arg, void *frame )
{
ntdll_get_thread_data()->exit_frame = frame;
__TRY
{
call_thread_func_wrapper( entry, arg );
}
__EXCEPT(unhandled_exception_filter)
{
NtTerminateThread( GetCurrentThread(), GetExceptionCode() );
}
__ENDTRY
abort(); /* should not be reached */
}
/***********************************************************************
* RtlExitUserThread (NTDLL.@)
*/
void WINAPI RtlExitUserThread( ULONG status )
{
if (!ntdll_get_thread_data()->exit_frame) exit_thread( status );
call_thread_exit_func( status, exit_thread, ntdll_get_thread_data()->exit_frame );
}
/***********************************************************************
* abort_thread
*/
void abort_thread( int status )
{
if (!ntdll_get_thread_data()->exit_frame) terminate_thread( status );
call_thread_exit_func( status, terminate_thread, ntdll_get_thread_data()->exit_frame );
}
/**********************************************************************
* DbgBreakPoint (NTDLL.@)
*/
__ASM_STDCALL_FUNC( DbgBreakPoint, 0, "int $3; ret")
/**********************************************************************
* DbgUserBreakPoint (NTDLL.@)
*/
__ASM_STDCALL_FUNC( DbgUserBreakPoint, 0, "int $3; ret")
/**********************************************************************
* NtCurrentTeb (NTDLL.@)
*/
__ASM_STDCALL_FUNC( NtCurrentTeb, 0, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" )
/**********************************************************************
* 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\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"pushl %ebx\n\t"
__ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
"movl 28(%ebp), %edx\n\t" /* ugly hack to pass the 6th param needed because of Shrinker */
"pushl 24(%ebp)\n\t"
"pushl 20(%ebp)\n\t"
"pushl 16(%ebp)\n\t"
"pushl 12(%ebp)\n\t"
"pushl 8(%ebp)\n\t"
"call " __ASM_NAME("call_exception_handler") "\n\t"
"popl %ebx\n\t"
__ASM_CFI(".cfi_same_value %ebx\n\t")
"leave\n"
__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
__ASM_CFI(".cfi_same_value %ebp\n\t")
"ret" )
__ASM_GLOBAL_FUNC(call_exception_handler,
"pushl %ebp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"subl $12,%esp\n\t"
"pushl 12(%ebp)\n\t" /* make any exceptions in this... */
"pushl %edx\n\t" /* handler be handled by... */
".byte 0x64\n\t"
"pushl (0)\n\t" /* nested_handler (passed in edx). */
".byte 0x64\n\t"
"movl %esp,(0)\n\t" /* push the new exception frame onto the exception stack. */
"pushl 20(%ebp)\n\t"
"pushl 16(%ebp)\n\t"
"pushl 12(%ebp)\n\t"
"pushl 8(%ebp)\n\t"
"movl 24(%ebp), %ecx\n\t" /* (*1) */
"call *%ecx\n\t" /* call handler. (*2) */
".byte 0x64\n\t"
"movl (0), %esp\n\t" /* restore previous... (*3) */
".byte 0x64\n\t"
"popl (0)\n\t" /* exception frame. */
"movl %ebp, %esp\n\t" /* restore saved stack, in case it was corrupted */
"popl %ebp\n\t"
__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
__ASM_CFI(".cfi_same_value %ebp\n\t")
"ret $20" ) /* (*4) */
#endif /* __i386__ */
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