signal_i386.c 79.1 KB
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/*
 * i386 signal handling routines
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 *
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 * Copyright 1999 Alexandre Julliard
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 *
 * 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
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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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 */

#ifdef __i386__

#include "config.h"
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#include "wine/port.h"
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#include <errno.h>
#include <signal.h>
#include <stdlib.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <sys/types.h>
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#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
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#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

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#ifdef HAVE_SYS_VM86_H
# include <sys/vm86.h>
#endif

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#ifdef HAVE_SYS_SIGNAL_H
# include <sys/signal.h>
#endif
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#ifdef HAVE_SYS_SYSCTL_H
# include <sys/sysctl.h>
#endif
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#include "ntstatus.h"
#define WIN32_NO_STATUS
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#include "windef.h"
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#include "wine/library.h"
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#include "ntdll_misc.h"
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#include "wine/exception.h"
#include "wine/debug.h"
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#ifdef HAVE_VALGRIND_MEMCHECK_H
#include <valgrind/memcheck.h>
#endif

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#undef ERR  /* Solaris needs to define this */

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/* 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;

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/***********************************************************************
 * signal context platform-specific definitions
 */

#ifdef linux

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typedef ucontext_t SIGCONTEXT;
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#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))
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#define FPUX_sig(context)    (FPU_sig(context) && !((context)->uc_mcontext.fpregs->status >> 16) ? (XMM_SAVE_AREA32 *)(FPU_sig(context) + 1) : NULL)
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#define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
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#define VIF_FLAG 0x00080000
#define VIP_FLAG 0x00100000
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int vm86_enter( void **vm86_ptr );
void vm86_return(void);
void vm86_return_end(void);
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__ASM_GLOBAL_FUNC(vm86_enter,
                  "pushl %ebp\n\t"
                  "movl %esp, %ebp\n\t"
                  "movl $166,%eax\n\t"  /*SYS_vm86*/
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                  "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
                  "movl (%ecx),%ecx\n\t"
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                  "pushl %ebx\n\t"
                  "movl $1,%ebx\n\t"    /*VM86_ENTER*/
                  "pushl %ecx\n\t"      /* put vm86plus_struct ptr somewhere we can find it */
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                  "pushl %fs\n\t"
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                  "pushl %gs\n\t"
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                  "int $0x80\n"
                  ".globl " __ASM_NAME("vm86_return") "\n\t"
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                  __ASM_FUNC("vm86_return") "\n"
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                  __ASM_NAME("vm86_return") ":\n\t"
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                  "popl %gs\n\t"
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                  "popl %fs\n\t"
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                  "popl %ecx\n\t"
                  "popl %ebx\n\t"
                  "popl %ebp\n\t"
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                  "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"
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                  __ASM_FUNC("vm86_return_end") "\n"
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                  __ASM_NAME("vm86_return_end") ":\n\t"
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                  "ret" )
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#ifdef HAVE_SYS_VM86_H
# define __HAVE_VM86
#endif
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#endif  /* linux */

#ifdef BSDI

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#include <machine/frame.h>
typedef struct trapframe SIGCONTEXT;

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#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)
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#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))

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#define FPU_sig(context)     NULL  /* FIXME */
#define FPUX_sig(context)    NULL  /* FIXME */

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#endif /* bsdi */

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#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
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typedef struct sigcontext SIGCONTEXT;

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#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)

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#define FPU_sig(context)     NULL  /* FIXME */
#define FPUX_sig(context)    NULL  /* FIXME */

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#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__ */
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#if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)

#ifdef _SCO_DS
#include <sys/regset.h>
#endif
#include <sys/ucontext.h>
typedef struct ucontext SIGCONTEXT;

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#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
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#ifdef ERR
#define ERROR_sig(context)   ((context)->uc_mcontext.gregs[ERR])
#endif
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#ifdef TRAPNO
#define TRAP_sig(context)     ((context)->uc_mcontext.gregs[TRAPNO])
#endif

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#define FPU_sig(context)     NULL  /* FIXME */
#define FPUX_sig(context)    NULL  /* FIXME */

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#endif  /* svr4 || SCO_DS */

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#ifdef __APPLE__
# include <sys/ucontext.h>

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typedef ucontext_t SIGCONTEXT;
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/* 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)
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#define FPU_sig(context)     NULL
#define FPUX_sig(context)    ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->__fs.__fpu_fcw)
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#else
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#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)
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#define FPU_sig(context)     NULL
#define FPUX_sig(context)    ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->fs.fpu_fcw)
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#endif
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#endif /* __APPLE__ */

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#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__ */

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WINE_DEFAULT_DEBUG_CHANNEL(seh);
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Patrik Stridvall committed
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typedef int (*wine_signal_handler)(unsigned int sig);
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static const size_t teb_size = 4096;  /* we reserve one page for the TEB */
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static size_t signal_stack_mask;
static size_t signal_stack_size;

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static wine_signal_handler handlers[256];

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static int fpux_support;  /* whether the CPU support extended fpu context */

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extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( const CONTEXT *context );
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enum i386_trap_code
{
    TRAP_x86_UNKNOWN    = -1,  /* Unknown fault (TRAP_sig not defined) */
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#if defined(__FreeBSD__) || 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
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    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 */
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    TRAP_x86_CACHEFLT   = 19   /* SIMD exception (via SIGFPE) if CPU is SSE capable
                                  otherwise Cache flush exception (via SIGSEV) */
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#endif
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};

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/* 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 );
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/***********************************************************************
 *           dispatch_signal
 */
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static inline int dispatch_signal(unsigned int sig)
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{
    if (handlers[sig] == NULL) return 0;
    return handlers[sig](sig);
}


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/***********************************************************************
 *           get_trap_code
 *
 * Get the trap code for a signal.
 */
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static inline enum i386_trap_code get_trap_code( const SIGCONTEXT *sigcontext )
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{
#ifdef TRAP_sig
    return TRAP_sig(sigcontext);
#else
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    return TRAP_x86_UNKNOWN;  /* unknown trap code */
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#endif
}
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/***********************************************************************
 *           get_error_code
 *
 * Get the error code for a signal.
 */
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static inline WORD get_error_code( const SIGCONTEXT *sigcontext )
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{
#ifdef ERROR_sig
    return ERROR_sig(sigcontext);
#else
    return 0;
#endif
}

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/***********************************************************************
 *           get_signal_stack
 *
 * Get the base of the signal stack for the current thread.
 */
static inline void *get_signal_stack(void)
{
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    return (char *)NtCurrentTeb() + 4096;
525 526 527
}


528 529 530 531 532 533 534 535 536
/***********************************************************************
 *           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) );
537
    return (TEB *)(esp & ~signal_stack_mask);
538 539 540
}


541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698
/*******************************************************************
 *         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 (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
            ((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
            (ULONG_PTR)frame & 3)
        {
            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(), 1 );
    }
    return STATUS_SUCCESS;
}


699
#ifdef __HAVE_VM86
700 701 702 703 704 705 706
/***********************************************************************
 *           save_vm86_context
 *
 * Set the register values from a vm86 structure.
 */
static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
{
707
    context->ContextFlags = CONTEXT_FULL;
708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750
    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;
}
751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769


/**********************************************************************
 *		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 =
770
        (struct vm86plus_struct*)(ntdll_get_thread_data()->vm86_ptr);
771 772 773 774 775 776

    /*
     * 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.
     */
777
    while (check_pending && get_vm86_teb_info()->vm86_pending)
778 779
    {
        check_pending = FALSE;
780
        ntdll_get_thread_data()->vm86_ptr = NULL;
781 782 783 784 785 786
            
        /*
         * 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.
         */
787
        if (vm86->regs.eflags & VIF_FLAG)
788 789 790 791 792 793 794 795 796 797
        {
            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;

798
            vcontext.EFlags &= ~VIP_FLAG;
799
            get_vm86_teb_info()->vm86_pending = 0;
800
            raise_exception( rec, &vcontext, TRUE );
801 802 803 804 805

            restore_vm86_context( &vcontext, vm86 );
            check_pending = TRUE;
        }

806
        ntdll_get_thread_data()->vm86_ptr = vm86;
807 808 809 810 811 812 813
    }

    /*
     * Merge VIP flags in a signal safe way. This requires
     * that the following operation compiles into atomic
     * instruction.
     */
814
    vm86->regs.eflags |= get_vm86_teb_info()->vm86_pending;
815
}
816
#endif /* __HAVE_VM86 */
817 818


819 820 821 822 823 824 825 826 827 828 829 830
#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"
831 832
                  "int $0x91\n\t"
                  "ret" )
833 834 835 836 837 838 839 840 841 842

/* 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");

843
    thread_data = (struct ntdll_thread_data *)get_current_teb()->SystemReserved2;
844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866
    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

867 868
typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );

869

870 871 872 873
/***********************************************************************
 *           init_handler
 *
 * Handler initialization when the full context is not needed.
874
 * Return the stack pointer to use for pushing the exception data.
875
 */
876
static inline void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
877
{
878
    TEB *teb = get_current_teb();
879

880 881 882 883 884 885 886 887 888 889 890 891
    /* 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

892
#ifndef __sun  /* see above for Solaris handling */
893 894 895 896 897
    {
        struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SystemReserved2;
        wine_set_fs( thread_data->fs );
        wine_set_gs( thread_data->gs );
    }
898
#endif
899

900 901
    if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
        !wine_ldt_is_system(SS_sig(sigcontext)))  /* 16-bit mode */
902
    {
903 904 905 906 907 908 909
        /*
         * 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.
         */
910
        return teb->WOW32Reserved;
911
    }
912
    return (void *)(ESP_sig(sigcontext) & ~3);
913 914 915
}


916 917 918 919 920
/***********************************************************************
 *           save_fpu
 *
 * Save the thread FPU context.
 */
921
static inline void save_fpu( CONTEXT *context )
922 923 924 925 926 927 928 929
{
#ifdef __GNUC__
    context->ContextFlags |= CONTEXT_FLOATING_POINT;
    __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
#endif
}


930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948
/***********************************************************************
 *           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
}


949 950 951
/***********************************************************************
 *           restore_fpu
 *
952
 * Restore the FPU context to a sigcontext.
953
 */
954
static inline void restore_fpu( const CONTEXT *context )
955
{
956
    FLOATING_SAVE_AREA float_status = context->FloatSave;
957
    /* reset the current interrupt status */
958
    float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
959
#ifdef __GNUC__
960
    __asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
961 962 963 964
#endif  /* __GNUC__ */
}


965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984
/***********************************************************************
 *           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
}


985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
/***********************************************************************
 *           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);
    }
}


1031 1032 1033 1034 1035
/***********************************************************************
 *           save_context
 *
 * Build a context structure from the signal info.
 */
1036
static inline void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
1037
{
1038
    struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
1039 1040
    FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
    XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
1041

1042
    memset(context, 0, sizeof(*context));
1043
    context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059
    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));
1060 1061 1062 1063 1064 1065
    context->Dr0          = regs->dr0;
    context->Dr1          = regs->dr1;
    context->Dr2          = regs->dr2;
    context->Dr3          = regs->dr3;
    context->Dr6          = regs->dr6;
    context->Dr7          = regs->dr7;
1066

1067
    if (fpu)
1068 1069
    {
        context->ContextFlags |= CONTEXT_FLOATING_POINT;
1070
        context->FloatSave = *fpu;
1071
    }
1072
    if (fpux)
1073
    {
1074
        context->ContextFlags |= CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
1075 1076
        memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) );
        fpux_support = 1;
1077
        if (!fpu) fpux_to_fpu( &context->FloatSave, fpux );
1078
    }
1079
    if (!fpu && !fpux) save_fpu( context );
1080 1081 1082 1083 1084 1085 1086 1087
}


/***********************************************************************
 *           restore_context
 *
 * Restore the signal info from the context.
 */
1088
static inline void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
1089
{
1090
    struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
1091 1092
    FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
    XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
1093 1094 1095 1096 1097 1098 1099

    regs->dr0 = context->Dr0;
    regs->dr1 = context->Dr1;
    regs->dr2 = context->Dr2;
    regs->dr3 = context->Dr3;
    regs->dr6 = context->Dr6;
    regs->dr7 = context->Dr7;
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123
    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
1124

1125 1126 1127
    if (fpu) *fpu = context->FloatSave;
    if (fpux) memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) );
    if (!fpu && !fpux) restore_fpu( context );
1128 1129 1130
}


1131
/***********************************************************************
1132
 *		RtlCaptureContext (NTDLL.@)
1133
 */
1134
void WINAPI __regs_RtlCaptureContext( CONTEXT *context, CONTEXT *regs )
1135 1136
{
    *context = *regs;
1137 1138
    if (fpux_support) save_fpux( context );
    else save_fpu( context );
1139
}
1140
DEFINE_REGS_ENTRYPOINT( RtlCaptureContext, 1 )
1141 1142


1143 1144 1145
/***********************************************************************
 *           set_cpu_context
 *
1146
 * Set the new CPU context. Used by NtSetContextThread.
1147
 */
1148
void set_cpu_context( const CONTEXT *context )
1149 1150 1151
{
    DWORD flags = context->ContextFlags & ~CONTEXT_i386;

1152
    if ((flags & CONTEXT_EXTENDED_REGISTERS) && fpux_support) restore_fpux( context );
1153
    else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
1154

1155 1156 1157 1158 1159 1160 1161 1162 1163 1164
    if (flags & CONTEXT_DEBUG_REGISTERS)
    {
        struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
        regs->dr0 = context->Dr0;
        regs->dr1 = context->Dr1;
        regs->dr2 = context->Dr2;
        regs->dr3 = context->Dr3;
        regs->dr6 = context->Dr6;
        regs->dr7 = context->Dr7;
    }
1165 1166
    if (flags & CONTEXT_FULL)
    {
1167
        if (!(flags & CONTEXT_CONTROL))
1168
            FIXME( "setting partial context (%x) not supported\n", flags );
1169
        else if (flags & CONTEXT_SEGMENTS)
1170
            __wine_call_from_32_restore_regs( context );
1171 1172 1173 1174 1175 1176 1177 1178 1179
        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_call_from_32_restore_regs( &newcontext );
        }
1180
    }
1181 1182 1183
}


1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236
/***********************************************************************
 *           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) );
    }
}


1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378
/***********************************************************************
 *           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;
}


1379 1380 1381 1382 1383 1384
/***********************************************************************
 *           is_privileged_instr
 *
 * Check if the fault location is a privileged instruction.
 * Based on the instruction emulation code in dlls/kernel/instr.c.
 */
1385
static inline DWORD is_privileged_instr( CONTEXT86 *context )
1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406
{
    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 */
1407
        if (++prefix_count >= 15) return EXCEPTION_ILLEGAL_INSTRUCTION;
1408 1409 1410 1411 1412 1413 1414 1415 1416 1417
        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 */
1418
            return EXCEPTION_PRIV_INSTRUCTION;
1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436
        }
        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 */
1437
        return EXCEPTION_PRIV_INSTRUCTION;
1438 1439 1440 1441 1442 1443
    default:
        return 0;
    }
}


1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460
#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 )
{
1461 1462 1463 1464 1465 1466 1467 1468 1469
    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;
1470
            TRACE( "emulating ATL thunk at %p, func=%08x arg=%08x\n",
1471 1472 1473 1474 1475 1476 1477 1478 1479 1480
                   thunk, context->Eip, *((DWORD *)context->Esp + 1) );
            ret = TRUE;
        }
    }
    __EXCEPT_PAGE_FAULT
    {
        return FALSE;
    }
    __ENDTRY
    return ret;
1481 1482 1483
}


1484
/***********************************************************************
1485
 *           setup_exception_record
1486
 *
1487
 * Setup the exception record and context on the thread stack.
1488
 */
1489 1490
static EXCEPTION_RECORD *setup_exception_record( SIGCONTEXT *sigcontext, void *stack_ptr,
                                                 WORD fs, WORD gs, raise_func func )
1491 1492 1493 1494 1495 1496 1497 1498 1499 1500
{
    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;
1501
    } *stack = stack_ptr;
1502
    DWORD exception_code = 0;
1503 1504 1505

    /* stack sanity checks */

1506
    if ((char *)stack >= (char *)get_signal_stack() &&
1507
        (char *)stack < (char *)get_signal_stack() + signal_stack_size)
1508
    {
1509 1510 1511 1512
        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 );
1513
        abort_thread(1);
1514 1515
    }

1516
    if (stack - 1 > stack || /* check for overflow in subtraction */
1517
        (char *)stack <= (char *)NtCurrentTeb()->DeallocationStack ||
1518 1519
        (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
    {
1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532
        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 );
1533
        abort_thread(1);
1534 1535 1536 1537 1538 1539
    }
    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
1540
        {
1541 1542
            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",
1543
                      diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1544 1545
                      (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
                      NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1546
            abort_thread(1);
1547
        }
1548 1549 1550
    }

    stack--;  /* push the stack_layout structure */
1551 1552 1553
#if defined(VALGRIND_MAKE_MEM_UNDEFINED)
    VALGRIND_MAKE_MEM_UNDEFINED(stack, sizeof(*stack));
#elif defined(VALGRIND_MAKE_WRITABLE)
1554 1555
    VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack));
#endif
1556
    stack->ret_addr     = (void *)0xdeadbabe;  /* raise_func must not return */
1557 1558 1559 1560
    stack->rec_ptr      = &stack->rec;
    stack->context_ptr  = &stack->context;

    stack->rec.ExceptionRecord  = NULL;
1561
    stack->rec.ExceptionCode    = exception_code;
1562 1563 1564 1565
    stack->rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
    stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
    stack->rec.NumberParameters = 0;

1566
    save_context( &stack->context, sigcontext, fs, gs );
1567 1568 1569 1570

    /* now modify the sigcontext to return to the raise function */
    ESP_sig(sigcontext) = (DWORD)stack;
    EIP_sig(sigcontext) = (DWORD)func;
1571 1572
    /* clear single-step, direction, and align check flag */
    EFL_sig(sigcontext) &= ~(0x100|0x400|0x40000);
1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583
    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;
}


1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599
/***********************************************************************
 *           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 );
}


1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610
/***********************************************************************
 *           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 */
}


1611 1612 1613 1614 1615 1616 1617
/**********************************************************************
 *		get_fpu_code
 *
 * Get the FPU exception code from the FPU status.
 */
static inline DWORD get_fpu_code( const CONTEXT *context )
{
1618
    DWORD status = context->FloatSave.StatusWord & ~(context->FloatSave.ControlWord & 0x3f);
1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636

    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 */
}


/**********************************************************************
1637
 *		raise_segv_exception
1638
 */
1639
static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1640
{
1641 1642
    NTSTATUS status;

1643
    switch(rec->ExceptionCode)
1644
    {
1645 1646
    case EXCEPTION_ACCESS_VIOLATION:
        if (rec->NumberParameters == 2)
1647
        {
1648 1649
            if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT && check_atl_thunk( rec, context ))
                goto done;
1650 1651 1652
            if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
                                                             rec->ExceptionInformation[0] )))
                goto done;
1653
        }
1654
        break;
1655
    case EXCEPTION_DATATYPE_MISALIGNMENT:
1656
        /* FIXME: pass through exception handler first? */
1657
        if (context->EFlags & 0x00040000)
1658 1659
        {
            /* Disable AC flag, return */
1660
            context->EFlags &= ~0x00040000;
1661
            goto done;
1662
        }
1663 1664
        break;
    }
1665 1666
    status = NtRaiseException( rec, context, TRUE );
    if (status) raise_status( status, rec );
1667
done:
1668
    NtSetContextThread( GetCurrentThread(), context );
1669 1670 1671 1672
}


/**********************************************************************
1673
 *		raise_trap_exception
1674
 */
1675
static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1676
{
1677 1678
    NTSTATUS status;

1679
    if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
1680
    {
1681 1682 1683 1684 1685 1686 1687
        struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();

        /* 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) || (regs->dr7 & 0xff) )
1688
        {
1689
            /* (possible) hardware breakpoint, fetch the debug registers */
1690
            context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
1691
            NtGetContextThread(GetCurrentThread(), context);
1692
            context->ContextFlags |= CONTEXT_FULL;  /* restore flags */
1693
        }
1694 1695

        context->EFlags &= ~0x100;  /* clear single-step flag */
1696
    }
1697

1698 1699
    status = NtRaiseException( rec, context, TRUE );
    if (status) raise_status( status, rec );
1700 1701 1702 1703
}


/**********************************************************************
1704
 *		raise_generic_exception
1705 1706
 *
 * Generic raise function for exceptions that don't need special treatment.
1707
 */
1708
static void WINAPI raise_generic_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1709
{
1710 1711 1712 1713
    NTSTATUS status;

    status = NtRaiseException( rec, context, TRUE );
    if (status) raise_status( status, rec );
1714 1715 1716
}


1717
#ifdef __HAVE_VM86
1718
/**********************************************************************
1719
 *		raise_vm86_sti_exception
1720
 */
1721
static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1722
{
1723
    /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
1724
    get_vm86_teb_info()->vm86_pending |= VIP_FLAG;
1725

1726
    if (ntdll_get_thread_data()->vm86_ptr)
1727
    {
1728 1729 1730 1731
        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 */
1732
            goto done;
1733
        }
1734
        merge_vm86_pending_flags( rec );
1735
    }
1736
    else if (get_vm86_teb_info()->dpmi_vif &&
1737 1738
             !wine_ldt_is_system(context->SegCs) &&
             !wine_ldt_is_system(context->SegSs))
1739 1740
    {
        /* Executing DPMI code and virtual interrupts are enabled. */
1741
        get_vm86_teb_info()->vm86_pending = 0;
1742
        NtRaiseException( rec, context, TRUE );
1743
    }
1744
done:
1745
    NtSetContextThread( GetCurrentThread(), context );
1746 1747 1748
}


1749 1750 1751 1752 1753
/**********************************************************************
 *		usr2_handler
 *
 * Handler for SIGUSR2.
 * We use it to signal that the running __wine_enter_vm86() should
1754
 * immediately set VIP_FLAG, causing pending events to be handled
1755 1756
 * as early as possible.
 */
1757
static void usr2_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1758
{
1759
    EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_vm86_sti_exception );
1760
    rec->ExceptionCode = EXCEPTION_VM86_STI;
1761
}
1762
#endif /* __HAVE_VM86 */
1763 1764


1765 1766 1767 1768 1769
/**********************************************************************
 *		segv_handler
 *
 * Handler for SIGSEGV and related errors.
 */
1770
static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1771
{
1772 1773
    WORD fs, gs;
    EXCEPTION_RECORD *rec;
1774
    SIGCONTEXT *context = sigcontext;
1775 1776 1777 1778 1779 1780 1781
    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 ))
1782 1783 1784 1785 1786 1787 1788
    {
        /* 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;
        }
1789
        return;
1790
    }
1791 1792

    rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1793
    if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return;
1794

1795
    switch(get_trap_code(context))
1796
    {
1797
    case TRAP_x86_OFLOW:   /* Overflow exception */
1798 1799
        rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
        break;
1800
    case TRAP_x86_BOUND:   /* Bound range exception */
1801 1802
        rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
        break;
1803
    case TRAP_x86_PRIVINFLT:   /* Invalid opcode exception */
1804 1805
        rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
        break;
1806
    case TRAP_x86_STKFLT:  /* Stack fault */
1807 1808
        rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
        break;
1809 1810 1811
    case TRAP_x86_SEGNPFLT:  /* Segment not present exception */
    case TRAP_x86_PROTFLT:   /* General protection fault */
    case TRAP_x86_UNKNOWN:   /* Unknown fault code */
1812
        {
1813
            WORD err = get_error_code(context);
1814
            if (!err && (rec->ExceptionCode = is_privileged_instr( get_exception_context(rec) ))) break;
1815 1816 1817 1818
            rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
            rec->NumberParameters = 2;
            rec->ExceptionInformation[0] = 0;
            /* if error contains a LDT selector, use that as fault address */
1819 1820 1821 1822
            if ((err & 7) == 4 && !wine_ldt_is_system( err | 7 ))
                rec->ExceptionInformation[1] = err & ~7;
            else
                rec->ExceptionInformation[1] = 0xffffffff;
1823
        }
1824
        break;
1825
    case TRAP_x86_PAGEFLT:  /* Page fault */
1826 1827
        rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
        rec->NumberParameters = 2;
1828 1829
        rec->ExceptionInformation[0] = (get_error_code(context) >> 1) & 0x09;
        rec->ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
1830
        break;
1831
    case TRAP_x86_ALIGNFLT:  /* Alignment check exception */
1832 1833 1834
        rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
        break;
    default:
1835
        WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1836
        /* fall through */
1837 1838 1839 1840 1841 1842
    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 */
1843 1844 1845
        rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
        break;
    }
1846 1847 1848 1849 1850 1851 1852 1853
}


/**********************************************************************
 *		trap_handler
 *
 * Handler for SIGTRAP.
 */
1854
static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1855
{
1856 1857
    SIGCONTEXT *context = sigcontext;
    EXCEPTION_RECORD *rec = setup_exception( context, raise_trap_exception );
1858

1859
    switch(get_trap_code(context))
1860
    {
1861
    case TRAP_x86_TRCTRAP:  /* Single-step exception */
1862 1863
        rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
        break;
1864
    case TRAP_x86_BPTFLT:   /* Breakpoint exception */
1865 1866 1867 1868 1869 1870
        rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1;  /* back up over the int3 instruction */
        /* fall through */
    default:
        rec->ExceptionCode = EXCEPTION_BREAKPOINT;
        break;
    }
1871 1872 1873 1874 1875 1876 1877 1878
}


/**********************************************************************
 *		fpe_handler
 *
 * Handler for SIGFPE.
 */
1879
static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1880
{
1881 1882
    CONTEXT *win_context;
    SIGCONTEXT *context = sigcontext;
1883
    EXCEPTION_RECORD *rec = setup_exception( context, raise_generic_exception );
1884

1885
    win_context = get_exception_context( rec );
1886

1887
    switch(get_trap_code(context))
1888
    {
1889
    case TRAP_x86_DIVIDE:   /* Division by zero exception */
1890 1891
        rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
        break;
1892
    case TRAP_x86_FPOPFLT:   /* Coprocessor segment overrun */
1893 1894
        rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
        break;
1895 1896
    case TRAP_x86_ARITHTRAP:  /* Floating point exception */
    case TRAP_x86_UNKNOWN:    /* Unknown fault code */
1897
        rec->ExceptionCode = get_fpu_code( win_context );
1898
        rec->ExceptionAddress = (LPVOID)win_context->FloatSave.ErrorOffset;
1899
        break;
1900 1901 1902 1903 1904 1905 1906 1907 1908 1909
    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;
1910
        /* no idea what meaning is actually behind this but that's what native does */
1911 1912
        rec->ExceptionInformation[0] = 0;
        break;
1913
    default:
1914
        WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1915 1916 1917
        rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
        break;
    }
1918 1919 1920 1921 1922 1923 1924
}


/**********************************************************************
 *		int_handler
 *
 * Handler for SIGINT.
1925 1926
 *
 * FIXME: should not be calling external functions on the signal stack.
1927
 */
1928
static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1929
{
1930
    WORD fs, gs;
1931
    init_handler( sigcontext, &fs, &gs );
1932
    if (!dispatch_signal(SIGINT))
1933
    {
1934
        EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_generic_exception );
1935
        rec->ExceptionCode = CONTROL_C_EXIT;
1936
    }
1937 1938
}

1939 1940 1941 1942 1943
/**********************************************************************
 *		abrt_handler
 *
 * Handler for SIGABRT.
 */
1944
static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1945
{
1946
    EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_generic_exception );
1947 1948
    rec->ExceptionCode  = EXCEPTION_WINE_ASSERTION;
    rec->ExceptionFlags = EH_NONCONTINUABLE;
1949 1950
}

1951

1952
/**********************************************************************
1953
 *		quit_handler
1954
 *
1955
 * Handler for SIGQUIT.
1956
 */
1957
static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1958
{
1959
    WORD fs, gs;
1960
    init_handler( sigcontext, &fs, &gs );
1961
    abort_thread(0);
1962 1963 1964
}


1965 1966 1967 1968 1969
/**********************************************************************
 *		usr1_handler
 *
 * Handler for SIGUSR1, used to signal a thread that it got suspended.
 */
1970
static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1971
{
1972
    CONTEXT context;
1973
    WORD fs, gs;
1974

1975 1976
    init_handler( sigcontext, &fs, &gs );
    save_context( &context, sigcontext, fs, gs );
1977
    wait_suspend( &context );
1978
    restore_context( &context, sigcontext );
1979 1980 1981
}


1982 1983 1984 1985 1986 1987 1988 1989 1990 1991
/**********************************************************************
 *		get_signal_stack_total_size
 *
 * Retrieve the size to allocate for the signal stack, including the TEB at the bottom.
 * Must be a power of two.
 */
size_t get_signal_stack_total_size(void)
{
    if (!signal_stack_size)
    {
1992
        size_t size = 8192, min_size = teb_size + max( MINSIGSTKSZ, 8192 );
1993 1994 1995 1996 1997 1998 1999 2000 2001
        /* find the first power of two not smaller than min_size */
        while (size < min_size) size *= 2;
        signal_stack_mask = size - 1;
        signal_stack_size = size - teb_size;
    }
    return signal_stack_size + teb_size;
}


2002 2003 2004
/***********************************************************************
 *           __wine_set_signal_handler   (NTDLL.@)
 */
2005
int CDECL __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
2006
{
2007
    if (sig >= sizeof(handlers) / sizeof(handlers[0])) return -1;
2008 2009 2010 2011 2012 2013
    if (handlers[sig] != NULL) return -2;
    handlers[sig] = wsh;
    return 0;
}


2014
/**********************************************************************
2015
 *		signal_init_thread
2016
 */
2017
void signal_init_thread( TEB *teb )
2018
{
2019 2020
    struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SystemReserved2;
    LDT_ENTRY fs_entry;
2021
    stack_t ss;
2022 2023 2024 2025 2026 2027 2028 2029 2030

#ifdef __APPLE__
    int mib[2], val = 1;

    mib[0] = CTL_KERN;
    mib[1] = KERN_THALTSTACK;
    sysctl( mib, 2, NULL, NULL, &val, sizeof(val) );
#endif

2031
    ss.ss_sp    = (char *)teb + teb_size;
2032
    ss.ss_size  = signal_stack_size;
2033
    ss.ss_flags = 0;
2034
    if (sigaltstack(&ss, NULL) == -1) perror( "sigaltstack" );
2035

2036 2037 2038 2039 2040
    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();
2041 2042 2043 2044 2045 2046 2047 2048
}

/**********************************************************************
 *		signal_init_process
 */
void signal_init_process(void)
{
    struct sigaction sig_act;
2049

2050
    sig_act.sa_mask = server_block_set;
2051 2052 2053 2054 2055
    sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
#ifdef SA_ONSTACK
    sig_act.sa_flags |= SA_ONSTACK;
#endif

2056
    sig_act.sa_sigaction = int_handler;
2057
    if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
2058
    sig_act.sa_sigaction = fpe_handler;
2059
    if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
2060
    sig_act.sa_sigaction = abrt_handler;
2061
    if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
2062 2063
    sig_act.sa_sigaction = quit_handler;
    if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
2064
    sig_act.sa_sigaction = usr1_handler;
2065 2066
    if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;

2067
    sig_act.sa_sigaction = segv_handler;
2068 2069
    if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
    if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
2070
#ifdef SIGBUS
2071
    if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
2072
#endif
2073

2074
#ifdef SIGTRAP
2075
    sig_act.sa_sigaction = trap_handler;
2076
    if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
2077
#endif
2078

2079
#ifdef __HAVE_VM86
2080
    sig_act.sa_sigaction = usr2_handler;
2081
    if (sigaction( SIGUSR2, &sig_act, NULL ) == -1) goto error;
2082 2083
#endif

2084
    return;
2085 2086 2087

 error:
    perror("sigaction");
2088
    exit(1);
2089 2090
}

2091

2092
#ifdef __HAVE_VM86
2093
/**********************************************************************
2094
 *		__wine_enter_vm86   (NTDLL.@)
2095 2096 2097 2098 2099 2100 2101 2102 2103
 *
 * Enter vm86 mode with the specified register context.
 */
void __wine_enter_vm86( CONTEXT *context )
{
    EXCEPTION_RECORD rec;
    int res;
    struct vm86plus_struct vm86;

2104
    memset( &vm86, 0, sizeof(vm86) );
2105 2106
    for (;;)
    {
2107
        restore_vm86_context( context, &vm86 );
2108

2109
        ntdll_get_thread_data()->vm86_ptr = &vm86;
2110
        merge_vm86_pending_flags( &rec );
2111

2112
        res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
2113
        if (res < 0)
2114
        {
2115 2116 2117
            errno = -res;
            return;
        }
2118

2119
        save_vm86_context( context, &vm86 );
2120

2121 2122 2123 2124 2125
        rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
        rec.ExceptionRecord  = NULL;
        rec.ExceptionAddress = (LPVOID)context->Eip;
        rec.NumberParameters = 0;

2126 2127 2128
        switch(VM86_TYPE(res))
        {
        case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
2129
            rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
2130
            break;
2131
        case VM86_TRAP: /* return due to DOS-debugger request */
2132 2133
            switch(VM86_ARG(res))
            {
2134
            case TRAP_x86_TRCTRAP:  /* Single-step exception */
2135 2136
                rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
                break;
2137
            case TRAP_x86_BPTFLT:   /* Breakpoint exception */
2138 2139 2140 2141 2142 2143
                rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1;  /* back up over the int3 instruction */
                /* fall through */
            default:
                rec.ExceptionCode = EXCEPTION_BREAKPOINT;
                break;
            }
2144
            break;
2145 2146
        case VM86_INTx: /* int3/int x instruction (ARG = x) */
            rec.ExceptionCode = EXCEPTION_VM86_INTx;
2147 2148
            rec.NumberParameters = 1;
            rec.ExceptionInformation[0] = VM86_ARG(res);
2149 2150
            break;
        case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
2151 2152
            context->EFlags |= VIF_FLAG;
            context->EFlags &= ~VIP_FLAG;
2153
            get_vm86_teb_info()->vm86_pending = 0;
2154 2155 2156 2157 2158
            rec.ExceptionCode = EXCEPTION_VM86_STI;
            break;
        case VM86_PICRETURN: /* return due to pending PIC request */
            rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
            break;
2159
        case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
2160
        default:
2161
            WINE_ERR( "unhandled result from vm86 mode %x\n", res );
2162 2163
            continue;
        }
2164
        raise_exception( &rec, context, TRUE );
2165 2166 2167
    }
}

2168
#else /* __HAVE_VM86 */
2169 2170 2171
/**********************************************************************
 *		__wine_enter_vm86   (NTDLL.@)
 */
2172 2173 2174 2175
void __wine_enter_vm86( CONTEXT *context )
{
    MESSAGE("vm86 mode not supported on this platform\n");
}
2176
#endif /* __HAVE_VM86 */
2177

2178

2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252
/*******************************************************************
 *		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 (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
            ((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
            (UINT_PTR)frame & 3)
            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) NtSetContextThread( GetCurrentThread(), context );
    return status;
}


2253 2254 2255 2256 2257
/***********************************************************************
 *		RtlRaiseException (NTDLL.@)
 */
void WINAPI __regs_RtlRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context )
{
2258 2259 2260 2261
    NTSTATUS status;

    rec->ExceptionAddress = (void *)context->Eip;
    status = raise_exception( rec, context, TRUE );
2262 2263 2264 2265 2266
    if (status != STATUS_SUCCESS) raise_status( status, rec );
}
DEFINE_REGS_ENTRYPOINT( RtlRaiseException, 1 )


2267
/**********************************************************************
2268
 *		DbgBreakPoint   (NTDLL.@)
2269
 */
2270
__ASM_STDCALL_FUNC( DbgBreakPoint, 0, "int $3; ret")
2271 2272

/**********************************************************************
2273
 *		DbgUserBreakPoint   (NTDLL.@)
2274
 */
2275
__ASM_STDCALL_FUNC( DbgUserBreakPoint, 0, "int $3; ret")
2276

2277 2278 2279
/**********************************************************************
 *           NtCurrentTeb   (NTDLL.@)
 */
2280
__ASM_STDCALL_FUNC( NtCurrentTeb, 0, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" )
2281

2282 2283 2284

/**********************************************************************
 *		EXC_CallHandler   (internal)
2285 2286 2287 2288 2289 2290 2291
 *
 * 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).
2292 2293 2294 2295
 */
__ASM_GLOBAL_FUNC( EXC_CallHandler,
"	pushl	%ebp\n"
"	movl	%esp, %ebp\n"
2296
"	pushl	%ebx\n"
2297 2298 2299 2300 2301 2302
"	movl	28(%ebp), %edx\n" /* ugly hack to pass the 6th param needed because of Shrinker */
"	pushl	24(%ebp)\n"
"	pushl	20(%ebp)\n"
"	pushl	16(%ebp)\n"
"	pushl	12(%ebp)\n"
"	pushl	8(%ebp)\n"
2303
"	call	" __ASM_NAME("call_exception_handler") "\n"
2304
"	popl	%ebx\n"
2305 2306
"	leave\n"
"	ret\n"
2307
)
2308 2309 2310
__ASM_GLOBAL_FUNC(call_exception_handler,
"	pushl	%ebp\n"
"	movl	%esp, %ebp\n"
2311
"	subl    $12,%esp\n"
2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330
"	pushl	12(%ebp)\n"       /* make any exceptions in this... */
"	pushl	%edx\n"           /* handler be handled by... */
"	.byte	0x64\n"
"	pushl	(0)\n"            /* nested_handler (passed in edx). */
"	.byte	0x64\n"
"	movl	%esp,(0)\n"       /* push the new exception frame onto the exception stack. */
"	pushl	20(%ebp)\n"
"	pushl	16(%ebp)\n"
"	pushl	12(%ebp)\n"
"	pushl	8(%ebp)\n"
"	movl	24(%ebp), %ecx\n" /* (*1) */
"	call	*%ecx\n"          /* call handler. (*2) */
"	.byte	0x64\n"
"	movl	(0), %esp\n"      /* restore previous... (*3) */
"	.byte	0x64\n"
"	popl	(0)\n"            /* exception frame. */
"	movl	%ebp, %esp\n"     /* restore saved stack, in case it was corrupted */
"	popl	%ebp\n"
"	ret	$20\n"            /* (*4) */
2331
)
2332
#endif  /* __i386__ */