dlls/ntdll/signal_i386.c

   1 /*
   2  * i386 signal handling routines
   3  *
   4  * Copyright 1999 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #ifdef __i386__
  22
  23 #include "config.h"
  24 #include "wine/port.h"
  25
  26 #include <errno.h>
  27 #include <signal.h>
  28 #include <stdlib.h>
  29 #include <stdarg.h>
  30 #include <stdio.h>
  31 #include <sys/types.h>
  32 #ifdef HAVE_UNISTD_H
  33 # include <unistd.h>
  34 #endif
  35
  36 #ifdef HAVE_SYS_PARAM_H
  37 # include <sys/param.h>
  38 #endif
  39 #ifdef HAVE_SYSCALL_H
  40 # include <syscall.h>
  41 #else
  42 # ifdef HAVE_SYS_SYSCALL_H
  43 #  include <sys/syscall.h>
  44 # endif
  45 #endif
  46
  47 #ifdef HAVE_SYS_VM86_H
  48 # include <sys/vm86.h>
  49 #endif
  50
  51 #ifdef HAVE_SYS_SIGNAL_H
  52 # include <sys/signal.h>
  53 #endif
  54 #ifdef HAVE_SYS_SYSCTL_H
  55 # include <sys/sysctl.h>
  56 #endif
  57
  58 #include "windef.h"
  59 #include "wine/library.h"
  60 #include "ntdll_misc.h"
  61 #include "wine/exception.h"
  62 #include "wine/debug.h"
  63
  64 #ifdef HAVE_VALGRIND_MEMCHECK_H
  65 #include <valgrind/memcheck.h>
  66 #endif
  67
  68 #undef ERR  /* Solaris needs to define this */
  69
  70 /* not defined for x86, so copy the x86_64 definition */
  71 typedef struct DECLSPEC_ALIGN(16) _M128A
  72 {
  73     ULONGLONG Low;
  74     LONGLONG High;
  75 } M128A;
  76
  77 typedef struct
  78 {
  79     WORD ControlWord;
  80     WORD StatusWord;
  81     BYTE TagWord;
  82     BYTE Reserved1;
  83     WORD ErrorOpcode;
  84     DWORD ErrorOffset;
  85     WORD ErrorSelector;
  86     WORD Reserved2;
  87     DWORD DataOffset;
  88     WORD DataSelector;
  89     WORD Reserved3;
  90     DWORD MxCsr;
  91     DWORD MxCsr_Mask;
  92     M128A FloatRegisters[8];
  93     M128A XmmRegisters[16];
  94     BYTE Reserved4[96];
  95 } XMM_SAVE_AREA32;
  96
  97 /***********************************************************************
  98  * signal context platform-specific definitions
  99  */
 100
 101 #ifdef linux
 102
 103 typedef ucontext_t SIGCONTEXT;
 104
 105 #define EAX_sig(context)     ((context)->uc_mcontext.gregs[REG_EAX])
 106 #define EBX_sig(context)     ((context)->uc_mcontext.gregs[REG_EBX])
 107 #define ECX_sig(context)     ((context)->uc_mcontext.gregs[REG_ECX])
 108 #define EDX_sig(context)     ((context)->uc_mcontext.gregs[REG_EDX])
 109 #define ESI_sig(context)     ((context)->uc_mcontext.gregs[REG_ESI])
 110 #define EDI_sig(context)     ((context)->uc_mcontext.gregs[REG_EDI])
 111 #define EBP_sig(context)     ((context)->uc_mcontext.gregs[REG_EBP])
 112 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[REG_ESP])
 113
 114 #define CS_sig(context)      ((context)->uc_mcontext.gregs[REG_CS])
 115 #define DS_sig(context)      ((context)->uc_mcontext.gregs[REG_DS])
 116 #define ES_sig(context)      ((context)->uc_mcontext.gregs[REG_ES])
 117 #define SS_sig(context)      ((context)->uc_mcontext.gregs[REG_SS])
 118 #define FS_sig(context)      ((context)->uc_mcontext.gregs[REG_FS])
 119 #define GS_sig(context)      ((context)->uc_mcontext.gregs[REG_GS])
 120
 121 #define EFL_sig(context)     ((context)->uc_mcontext.gregs[REG_EFL])
 122 #define EIP_sig(context)     ((context)->uc_mcontext.gregs[REG_EIP])
 123 #define TRAP_sig(context)    ((context)->uc_mcontext.gregs[REG_TRAPNO])
 124 #define ERROR_sig(context)   ((context)->uc_mcontext.gregs[REG_ERR])
 125
 126 #define FPU_sig(context)     ((FLOATING_SAVE_AREA*)((context)->uc_mcontext.fpregs))
 127 #define FPUX_sig(context)    (FPU_sig(context) && !((context)->uc_mcontext.fpregs->status >> 16) ? (XMM_SAVE_AREA32 *)(FPU_sig(context) + 1) : NULL)
 128
 129 #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
 130 #define VIF_FLAG 0x00080000
 131 #define VIP_FLAG 0x00100000
 132
 133 int vm86_enter( void **vm86_ptr );
 134 void vm86_return(void);
 135 void vm86_return_end(void);
 136 __ASM_GLOBAL_FUNC(vm86_enter,
 137                   "pushl %ebp\n\t"
 138                   "movl %esp, %ebp\n\t"
 139                   "movl $166,%eax\n\t"  /*SYS_vm86*/
 140                   "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
 141                   "movl (%ecx),%ecx\n\t"
 142                   "pushl %ebx\n\t"
 143                   "movl $1,%ebx\n\t"    /*VM86_ENTER*/
 144                   "pushl %ecx\n\t"      /* put vm86plus_struct ptr somewhere we can find it */
 145                   "pushl %fs\n\t"
 146                   "pushl %gs\n\t"
 147                   "int $0x80\n"
 148                   ".globl " __ASM_NAME("vm86_return") "\n\t"
 149                   __ASM_FUNC("vm86_return") "\n"
 150                   __ASM_NAME("vm86_return") ":\n\t"
 151                   "popl %gs\n\t"
 152                   "popl %fs\n\t"
 153                   "popl %ecx\n\t"
 154                   "popl %ebx\n\t"
 155                   "popl %ebp\n\t"
 156                   "testl %eax,%eax\n\t"
 157                   "jl 0f\n\t"
 158                   "cmpb $0,%al\n\t" /* VM86_SIGNAL */
 159                   "je " __ASM_NAME("vm86_enter") "\n\t"
 160                   "0:\n\t"
 161                   "movl 4(%esp),%ecx\n\t"  /* vm86_ptr */
 162                   "movl $0,(%ecx)\n\t"
 163                   ".globl " __ASM_NAME("vm86_return_end") "\n\t"
 164                   __ASM_FUNC("vm86_return_end") "\n"
 165                   __ASM_NAME("vm86_return_end") ":\n\t"
 166                   "ret" )
 167
 168 #ifdef HAVE_SYS_VM86_H
 169 # define __HAVE_VM86
 170 #endif
 171
 172 #endif  /* linux */
 173
 174 #ifdef BSDI
 175
 176 #include <machine/frame.h>
 177 typedef struct trapframe SIGCONTEXT;
 178
 179 #define EAX_sig(context)     ((context)->tf_eax)
 180 #define EBX_sig(context)     ((context)->tf_ebx)
 181 #define ECX_sig(context)     ((context)->tf_ecx)
 182 #define EDX_sig(context)     ((context)->tf_edx)
 183 #define ESI_sig(context)     ((context)->tf_esi)
 184 #define EDI_sig(context)     ((context)->tf_edi)
 185 #define EBP_sig(context)     ((context)->tf_ebp)
 186
 187 #define CS_sig(context)      ((context)->tf_cs)
 188 #define DS_sig(context)      ((context)->tf_ds)
 189 #define ES_sig(context)      ((context)->tf_es)
 190 #define SS_sig(context)      ((context)->tf_ss)
 191
 192 #define EFL_sig(context)     ((context)->tf_eflags)
 193
 194 #define EIP_sig(context)     (*((unsigned long*)&(context)->tf_eip))
 195 #define ESP_sig(context)     (*((unsigned long*)&(context)->tf_esp))
 196
 197 #define FPU_sig(context)     NULL  /* FIXME */
 198 #define FPUX_sig(context)    NULL  /* FIXME */
 199
 200 #endif /* bsdi */
 201
 202 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
 203
 204 typedef struct sigcontext SIGCONTEXT;
 205
 206 #define EAX_sig(context)     ((context)->sc_eax)
 207 #define EBX_sig(context)     ((context)->sc_ebx)
 208 #define ECX_sig(context)     ((context)->sc_ecx)
 209 #define EDX_sig(context)     ((context)->sc_edx)
 210 #define ESI_sig(context)     ((context)->sc_esi)
 211 #define EDI_sig(context)     ((context)->sc_edi)
 212 #define EBP_sig(context)     ((context)->sc_ebp)
 213
 214 #define CS_sig(context)      ((context)->sc_cs)
 215 #define DS_sig(context)      ((context)->sc_ds)
 216 #define ES_sig(context)      ((context)->sc_es)
 217 #define FS_sig(context)      ((context)->sc_fs)
 218 #define GS_sig(context)      ((context)->sc_gs)
 219 #define SS_sig(context)      ((context)->sc_ss)
 220
 221 #define TRAP_sig(context)    ((context)->sc_trapno)
 222 #define ERROR_sig(context)   ((context)->sc_err)
 223 #define EFL_sig(context)     ((context)->sc_eflags)
 224
 225 #define EIP_sig(context)     ((context)->sc_eip)
 226 #define ESP_sig(context)     ((context)->sc_esp)
 227
 228 #define FPU_sig(context)     NULL  /* FIXME */
 229 #define FPUX_sig(context)    NULL  /* FIXME */
 230
 231 #endif  /* *BSD */
 232
 233 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 234
 235 #ifdef _SCO_DS
 236 #include <sys/regset.h>
 237 #endif
 238 #include <sys/ucontext.h>
 239 typedef struct ucontext SIGCONTEXT;
 240
 241 #ifdef _SCO_DS
 242 #define gregs regs
 243 #endif
 244
 245 #define EAX_sig(context)     ((context)->uc_mcontext.gregs[EAX])
 246 #define EBX_sig(context)     ((context)->uc_mcontext.gregs[EBX])
 247 #define ECX_sig(context)     ((context)->uc_mcontext.gregs[ECX])
 248 #define EDX_sig(context)     ((context)->uc_mcontext.gregs[EDX])
 249 #define ESI_sig(context)     ((context)->uc_mcontext.gregs[ESI])
 250 #define EDI_sig(context)     ((context)->uc_mcontext.gregs[EDI])
 251 #define EBP_sig(context)     ((context)->uc_mcontext.gregs[EBP])
 252
 253 #define CS_sig(context)      ((context)->uc_mcontext.gregs[CS])
 254 #define DS_sig(context)      ((context)->uc_mcontext.gregs[DS])
 255 #define ES_sig(context)      ((context)->uc_mcontext.gregs[ES])
 256 #define SS_sig(context)      ((context)->uc_mcontext.gregs[SS])
 257
 258 #define FS_sig(context)      ((context)->uc_mcontext.gregs[FS])
 259 #define GS_sig(context)      ((context)->uc_mcontext.gregs[GS])
 260
 261 #define EFL_sig(context)     ((context)->uc_mcontext.gregs[EFL])
 262
 263 #define EIP_sig(context)     ((context)->uc_mcontext.gregs[EIP])
 264 #ifdef UESP
 265 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[UESP])
 266 #elif defined(R_ESP)
 267 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[R_ESP])
 268 #else
 269 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[ESP])
 270 #endif
 271 #ifdef ERR
 272 #define ERROR_sig(context)   ((context)->uc_mcontext.gregs[ERR])
 273 #endif
 274 #ifdef TRAPNO
 275 #define TRAP_sig(context)     ((context)->uc_mcontext.gregs[TRAPNO])
 276 #endif
 277
 278 #define FPU_sig(context)     NULL  /* FIXME */
 279 #define FPUX_sig(context)    NULL  /* FIXME */
 280
 281 #endif  /* svr4 || SCO_DS */
 282
 283 #ifdef __APPLE__
 284 # include <sys/ucontext.h>
 285
 286 typedef ucontext_t SIGCONTEXT;
 287
 288 /* work around silly renaming of struct members in OS X 10.5 */
 289 #if __DARWIN_UNIX03 && defined(_STRUCT_X86_EXCEPTION_STATE32)
 290 #define EAX_sig(context)     ((context)->uc_mcontext->__ss.__eax)
 291 #define EBX_sig(context)     ((context)->uc_mcontext->__ss.__ebx)
 292 #define ECX_sig(context)     ((context)->uc_mcontext->__ss.__ecx)
 293 #define EDX_sig(context)     ((context)->uc_mcontext->__ss.__edx)
 294 #define ESI_sig(context)     ((context)->uc_mcontext->__ss.__esi)
 295 #define EDI_sig(context)     ((context)->uc_mcontext->__ss.__edi)
 296 #define EBP_sig(context)     ((context)->uc_mcontext->__ss.__ebp)
 297 #define CS_sig(context)      ((context)->uc_mcontext->__ss.__cs)
 298 #define DS_sig(context)      ((context)->uc_mcontext->__ss.__ds)
 299 #define ES_sig(context)      ((context)->uc_mcontext->__ss.__es)
 300 #define FS_sig(context)      ((context)->uc_mcontext->__ss.__fs)
 301 #define GS_sig(context)      ((context)->uc_mcontext->__ss.__gs)
 302 #define SS_sig(context)      ((context)->uc_mcontext->__ss.__ss)
 303 #define EFL_sig(context)     ((context)->uc_mcontext->__ss.__eflags)
 304 #define EIP_sig(context)     (*((unsigned long*)&(context)->uc_mcontext->__ss.__eip))
 305 #define ESP_sig(context)     (*((unsigned long*)&(context)->uc_mcontext->__ss.__esp))
 306 #define TRAP_sig(context)    ((context)->uc_mcontext->__es.__trapno)
 307 #define ERROR_sig(context)   ((context)->uc_mcontext->__es.__err)
 308 #define FPU_sig(context)     NULL
 309 #define FPUX_sig(context)    ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->__fs.__fpu_fcw)
 310 #else
 311 #define EAX_sig(context)     ((context)->uc_mcontext->ss.eax)
 312 #define EBX_sig(context)     ((context)->uc_mcontext->ss.ebx)
 313 #define ECX_sig(context)     ((context)->uc_mcontext->ss.ecx)
 314 #define EDX_sig(context)     ((context)->uc_mcontext->ss.edx)
 315 #define ESI_sig(context)     ((context)->uc_mcontext->ss.esi)
 316 #define EDI_sig(context)     ((context)->uc_mcontext->ss.edi)
 317 #define EBP_sig(context)     ((context)->uc_mcontext->ss.ebp)
 318 #define CS_sig(context)      ((context)->uc_mcontext->ss.cs)
 319 #define DS_sig(context)      ((context)->uc_mcontext->ss.ds)
 320 #define ES_sig(context)      ((context)->uc_mcontext->ss.es)
 321 #define FS_sig(context)      ((context)->uc_mcontext->ss.fs)
 322 #define GS_sig(context)      ((context)->uc_mcontext->ss.gs)
 323 #define SS_sig(context)      ((context)->uc_mcontext->ss.ss)
 324 #define EFL_sig(context)     ((context)->uc_mcontext->ss.eflags)
 325 #define EIP_sig(context)     (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
 326 #define ESP_sig(context)     (*((unsigned long*)&(context)->uc_mcontext->ss.esp))
 327 #define TRAP_sig(context)    ((context)->uc_mcontext->es.trapno)
 328 #define ERROR_sig(context)   ((context)->uc_mcontext->es.err)
 329 #define FPU_sig(context)     NULL
 330 #define FPUX_sig(context)    ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->fs.fpu_fcw)
 331 #endif
 332
 333 #endif /* __APPLE__ */
 334
 335 WINE_DEFAULT_DEBUG_CHANNEL(seh);
 336
 337 typedef int (*wine_signal_handler)(unsigned int sig);
 338
 339 static size_t signal_stack_mask;
 340 static size_t signal_stack_size;
 341
 342 static wine_signal_handler handlers[256];
 343
 344 static int fpux_support;  /* whether the CPU support extended fpu context */
 345
 346 extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( const CONTEXT *context );
 347
 348 enum i386_trap_code
 349 {
 350     TRAP_x86_UNKNOWN    = -1,  /* Unknown fault (TRAP_sig not defined) */
 351 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
 352     TRAP_x86_DIVIDE     = T_DIVIDE,     /* Division by zero exception */
 353     TRAP_x86_TRCTRAP    = T_TRCTRAP,    /* Single-step exception */
 354     TRAP_x86_NMI        = T_NMI,        /* NMI interrupt */
 355     TRAP_x86_BPTFLT     = T_BPTFLT,     /* Breakpoint exception */
 356     TRAP_x86_OFLOW      = T_OFLOW,      /* Overflow exception */
 357     TRAP_x86_BOUND      = T_BOUND,      /* Bound range exception */
 358     TRAP_x86_PRIVINFLT  = T_PRIVINFLT,  /* Invalid opcode exception */
 359     TRAP_x86_DNA        = T_DNA,        /* Device not available exception */
 360     TRAP_x86_DOUBLEFLT  = T_DOUBLEFLT,  /* Double fault exception */
 361     TRAP_x86_FPOPFLT    = T_FPOPFLT,    /* Coprocessor segment overrun */
 362     TRAP_x86_TSSFLT     = T_TSSFLT,     /* Invalid TSS exception */
 363     TRAP_x86_SEGNPFLT   = T_SEGNPFLT,   /* Segment not present exception */
 364     TRAP_x86_STKFLT     = T_STKFLT,     /* Stack fault */
 365     TRAP_x86_PROTFLT    = T_PROTFLT,    /* General protection fault */
 366     TRAP_x86_PAGEFLT    = T_PAGEFLT,    /* Page fault */
 367     TRAP_x86_ARITHTRAP  = T_ARITHTRAP,  /* Floating point exception */
 368     TRAP_x86_ALIGNFLT   = T_ALIGNFLT,   /* Alignment check exception */
 369     TRAP_x86_MCHK       = T_MCHK,       /* Machine check exception */
 370     TRAP_x86_CACHEFLT   = T_XMMFLT      /* Cache flush exception */
 371 #else
 372     TRAP_x86_DIVIDE     = 0,   /* Division by zero exception */
 373     TRAP_x86_TRCTRAP    = 1,   /* Single-step exception */
 374     TRAP_x86_NMI        = 2,   /* NMI interrupt */
 375     TRAP_x86_BPTFLT     = 3,   /* Breakpoint exception */
 376     TRAP_x86_OFLOW      = 4,   /* Overflow exception */
 377     TRAP_x86_BOUND      = 5,   /* Bound range exception */
 378     TRAP_x86_PRIVINFLT  = 6,   /* Invalid opcode exception */
 379     TRAP_x86_DNA        = 7,   /* Device not available exception */
 380     TRAP_x86_DOUBLEFLT  = 8,   /* Double fault exception */
 381     TRAP_x86_FPOPFLT    = 9,   /* Coprocessor segment overrun */
 382     TRAP_x86_TSSFLT     = 10,  /* Invalid TSS exception */
 383     TRAP_x86_SEGNPFLT   = 11,  /* Segment not present exception */
 384     TRAP_x86_STKFLT     = 12,  /* Stack fault */
 385     TRAP_x86_PROTFLT    = 13,  /* General protection fault */
 386     TRAP_x86_PAGEFLT    = 14,  /* Page fault */
 387     TRAP_x86_ARITHTRAP  = 16,  /* Floating point exception */
 388     TRAP_x86_ALIGNFLT   = 17,  /* Alignment check exception */
 389     TRAP_x86_MCHK       = 18,  /* Machine check exception */
 390     TRAP_x86_CACHEFLT   = 19   /* SIMD exception (via SIGFPE) if CPU is SSE capable
 391                                   otherwise Cache flush exception (via SIGSEV) */
 392 #endif
 393 };
 394
 395
 396 /***********************************************************************
 397  *           dispatch_signal
 398  */
 399 static inline int dispatch_signal(unsigned int sig)
 400 {
 401     if (handlers[sig] == NULL) return 0;
 402     return handlers[sig](sig);
 403 }
 404
 405
 406 /***********************************************************************
 407  *           get_trap_code
 408  *
 409  * Get the trap code for a signal.
 410  */
 411 static inline enum i386_trap_code get_trap_code( const SIGCONTEXT *sigcontext )
 412 {
 413 #ifdef TRAP_sig
 414     return TRAP_sig(sigcontext);
 415 #else
 416     return TRAP_x86_UNKNOWN;  /* unknown trap code */
 417 #endif
 418 }
 419
 420 /***********************************************************************
 421  *           get_error_code
 422  *
 423  * Get the error code for a signal.
 424  */
 425 static inline WORD get_error_code( const SIGCONTEXT *sigcontext )
 426 {
 427 #ifdef ERROR_sig
 428     return ERROR_sig(sigcontext);
 429 #else
 430     return 0;
 431 #endif
 432 }
 433
 434 /***********************************************************************
 435  *           get_signal_stack
 436  *
 437  * Get the base of the signal stack for the current thread.
 438  */
 439 static inline void *get_signal_stack(void)
 440 {
 441     return (char *)NtCurrentTeb() + 4096;
 442 }
 443
 444
 445 /***********************************************************************
 446  *           get_current_teb
 447  *
 448  * Get the current teb based on the stack pointer.
 449  */
 450 static inline TEB *get_current_teb(void)
 451 {
 452     unsigned long esp;
 453     __asm__("movl %%esp,%0" : "=g" (esp) );
 454     return (TEB *)(esp & ~signal_stack_mask);
 455 }
 456
 457
 458 #ifdef __HAVE_VM86
 459 /***********************************************************************
 460  *           save_vm86_context
 461  *
 462  * Set the register values from a vm86 structure.
 463  */
 464 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
 465 {
 466     context->ContextFlags = CONTEXT_FULL;
 467     context->Eax    = vm86->regs.eax;
 468     context->Ebx    = vm86->regs.ebx;
 469     context->Ecx    = vm86->regs.ecx;
 470     context->Edx    = vm86->regs.edx;
 471     context->Esi    = vm86->regs.esi;
 472     context->Edi    = vm86->regs.edi;
 473     context->Esp    = vm86->regs.esp;
 474     context->Ebp    = vm86->regs.ebp;
 475     context->Eip    = vm86->regs.eip;
 476     context->SegCs  = vm86->regs.cs;
 477     context->SegDs  = vm86->regs.ds;
 478     context->SegEs  = vm86->regs.es;
 479     context->SegFs  = vm86->regs.fs;
 480     context->SegGs  = vm86->regs.gs;
 481     context->SegSs  = vm86->regs.ss;
 482     context->EFlags = vm86->regs.eflags;
 483 }
 484
 485
 486 /***********************************************************************
 487  *           restore_vm86_context
 488  *
 489  * Build a vm86 structure from the register values.
 490  */
 491 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
 492 {
 493     vm86->regs.eax    = context->Eax;
 494     vm86->regs.ebx    = context->Ebx;
 495     vm86->regs.ecx    = context->Ecx;
 496     vm86->regs.edx    = context->Edx;
 497     vm86->regs.esi    = context->Esi;
 498     vm86->regs.edi    = context->Edi;
 499     vm86->regs.esp    = context->Esp;
 500     vm86->regs.ebp    = context->Ebp;
 501     vm86->regs.eip    = context->Eip;
 502     vm86->regs.cs     = context->SegCs;
 503     vm86->regs.ds     = context->SegDs;
 504     vm86->regs.es     = context->SegEs;
 505     vm86->regs.fs     = context->SegFs;
 506     vm86->regs.gs     = context->SegGs;
 507     vm86->regs.ss     = context->SegSs;
 508     vm86->regs.eflags = context->EFlags;
 509 }
 510
 511
 512 /**********************************************************************
 513  *              merge_vm86_pending_flags
 514  *
 515  * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
 516  * raises exception if there are pending events and VIF flag
 517  * has been turned on.
 518  *
 519  * Called from __wine_enter_vm86 because vm86_enter
 520  * doesn't check for pending events.
 521  *
 522  * Called from raise_vm86_sti_exception to check for
 523  * pending events in a signal safe way.
 524  */
 525 static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
 526 {
 527     BOOL check_pending = TRUE;
 528     struct vm86plus_struct *vm86 =
 529         (struct vm86plus_struct*)(ntdll_get_thread_data()->vm86_ptr);
 530
 531     /*
 532      * In order to prevent a race when SIGUSR2 occurs while
 533      * we are returning from exception handler, pending events
 534      * will be rechecked after each raised exception.
 535      */
 536     while (check_pending && get_vm86_teb_info()->vm86_pending)
 537     {
 538         check_pending = FALSE;
 539         ntdll_get_thread_data()->vm86_ptr = NULL;
 540
 541         /*
 542          * If VIF is set, throw exception.
 543          * Note that SIGUSR2 may turn VIF flag off so
 544          * VIF check must occur only when TEB.vm86_ptr is NULL.
 545          */
 546         if (vm86->regs.eflags & VIF_FLAG)
 547         {
 548             CONTEXT vcontext;
 549             save_vm86_context( &vcontext, vm86 );
 550
 551             rec->ExceptionCode    = EXCEPTION_VM86_STI;
 552             rec->ExceptionFlags   = EXCEPTION_CONTINUABLE;
 553             rec->ExceptionRecord  = NULL;
 554             rec->NumberParameters = 0;
 555             rec->ExceptionAddress = (LPVOID)vcontext.Eip;
 556
 557             vcontext.EFlags &= ~VIP_FLAG;
 558             get_vm86_teb_info()->vm86_pending = 0;
 559             __regs_RtlRaiseException( rec, &vcontext );
 560
 561             restore_vm86_context( &vcontext, vm86 );
 562             check_pending = TRUE;
 563         }
 564
 565         ntdll_get_thread_data()->vm86_ptr = vm86;
 566     }
 567
 568     /*
 569      * Merge VIP flags in a signal safe way. This requires
 570      * that the following operation compiles into atomic
 571      * instruction.
 572      */
 573     vm86->regs.eflags |= get_vm86_teb_info()->vm86_pending;
 574 }
 575 #endif /* __HAVE_VM86 */
 576
 577
 578 #ifdef __sun
 579
 580 /* We have to workaround two Solaris breakages:
 581  * - Solaris doesn't restore %ds and %es before calling the signal handler so exceptions in 16-bit
 582  *   code crash badly.
 583  * - Solaris inserts a libc trampoline to call our handler, but the trampoline expects that registers
 584  *   are setup correctly. So we need to insert our own trampoline below the libc trampoline to set %gs.
 585  */
 586
 587 extern int sigaction_syscall( int sig, const struct sigaction *new, struct sigaction *old );
 588 __ASM_GLOBAL_FUNC( sigaction_syscall,
 589                   "movl $0x62,%eax\n\t"
 590                   "int $0x91\n\t"
 591                   "ret" )
 592
 593 /* assume the same libc handler is used for all signals */
 594 static void (*libc_sigacthandler)( int signal, siginfo_t *siginfo, void *context );
 595
 596 static void wine_sigacthandler( int signal, siginfo_t *siginfo, void *sigcontext )
 597 {
 598     struct ntdll_thread_data *thread_data;
 599
 600     __asm__ __volatile__("mov %ss,%ax; mov %ax,%ds; mov %ax,%es");
 601
 602     thread_data = get_current_teb()->SystemReserved2;
 603     wine_set_fs( thread_data->fs );
 604     wine_set_gs( thread_data->gs );
 605
 606     libc_sigacthandler( signal, siginfo, sigcontext );
 607 }
 608
 609 static int solaris_sigaction( int sig, const struct sigaction *new, struct sigaction *old )
 610 {
 611     struct sigaction real_act;
 612
 613     if (sigaction( sig, new, old ) == -1) return -1;
 614
 615     /* retrieve the real handler and flags with a direct syscall */
 616     sigaction_syscall( sig, NULL, &real_act );
 617     libc_sigacthandler = real_act.sa_sigaction;
 618     real_act.sa_sigaction = wine_sigacthandler;
 619     sigaction_syscall( sig, &real_act, NULL );
 620     return 0;
 621 }
 622 #define sigaction(sig,new,old) solaris_sigaction(sig,new,old)
 623
 624 #endif
 625
 626 typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
 627
 628
 629 /***********************************************************************
 630  *           init_handler
 631  *
 632  * Handler initialization when the full context is not needed.
 633  * Return the stack pointer to use for pushing the exception data.
 634  */
 635 static inline void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
 636 {
 637     TEB *teb = get_current_teb();
 638     struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SystemReserved2;
 639
 640     /* get %fs and %gs at time of the fault */
 641 #ifdef FS_sig
 642     *fs = LOWORD(FS_sig(sigcontext));
 643 #else
 644     *fs = wine_get_fs();
 645 #endif
 646 #ifdef GS_sig
 647     *gs = LOWORD(GS_sig(sigcontext));
 648 #else
 649     *gs = wine_get_gs();
 650 #endif
 651
 652 #ifndef __sun  /* see above for Solaris handling */
 653     wine_set_fs( thread_data->fs );
 654     wine_set_gs( thread_data->gs );
 655 #endif
 656
 657     if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
 658         !wine_ldt_is_system(SS_sig(sigcontext)))  /* 16-bit mode */
 659     {
 660         /*
 661          * Win16 or DOS protected mode. Note that during switch
 662          * from 16-bit mode to linear mode, CS may be set to system
 663          * segment before FS is restored. Fortunately, in this case
 664          * SS is still non-system segment. This is why both CS and SS
 665          * are checked.
 666          */
 667         return teb->WOW32Reserved;
 668     }
 669     return (void *)(ESP_sig(sigcontext) & ~3);
 670 }
 671
 672
 673 /***********************************************************************
 674  *           save_fpu
 675  *
 676  * Save the thread FPU context.
 677  */
 678 static inline void save_fpu( CONTEXT *context )
 679 {
 680 #ifdef __GNUC__
 681     context->ContextFlags |= CONTEXT_FLOATING_POINT;
 682     __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
 683 #endif
 684 }
 685
 686
 687 /***********************************************************************
 688  *           save_fpux
 689  *
 690  * Save the thread FPU extended context.
 691  */
 692 static inline void save_fpux( CONTEXT *context )
 693 {
 694 #ifdef __GNUC__
 695     /* we have to enforce alignment by hand */
 696     char buffer[sizeof(XMM_SAVE_AREA32) + 16];
 697     XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
 698
 699     __asm__ __volatile__( "fxsave %0" : "=m" (*state) );
 700     context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
 701     memcpy( context->ExtendedRegisters, state, sizeof(*state) );
 702 #endif
 703 }
 704
 705
 706 /***********************************************************************
 707  *           restore_fpu
 708  *
 709  * Restore the FPU context to a sigcontext.
 710  */
 711 static inline void restore_fpu( const CONTEXT *context )
 712 {
 713     FLOATING_SAVE_AREA float_status = context->FloatSave;
 714     /* reset the current interrupt status */
 715     float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
 716 #ifdef __GNUC__
 717     __asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
 718 #endif  /* __GNUC__ */
 719 }
 720
 721
 722 /***********************************************************************
 723  *           restore_fpux
 724  *
 725  * Restore the FPU extended context to a sigcontext.
 726  */
 727 static inline void restore_fpux( const CONTEXT *context )
 728 {
 729 #ifdef __GNUC__
 730     /* we have to enforce alignment by hand */
 731     char buffer[sizeof(XMM_SAVE_AREA32) + 16];
 732     XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
 733
 734     memcpy( state, context->ExtendedRegisters, sizeof(*state) );
 735     /* reset the current interrupt status */
 736     state->StatusWord &= state->ControlWord | 0xff80;
 737     __asm__ __volatile__( "fxrstor %0" : : "m" (*state) );
 738 #endif
 739 }
 740
 741
 742 /***********************************************************************
 743  *           fpux_to_fpu
 744  *
 745  * Build a standard FPU context from an extended one.
 746  */
 747 static void fpux_to_fpu( FLOATING_SAVE_AREA *fpu, const XMM_SAVE_AREA32 *fpux )
 748 {
 749     unsigned int i, tag, stack_top;
 750
 751     fpu->ControlWord   = fpux->ControlWord | 0xffff0000;
 752     fpu->StatusWord    = fpux->StatusWord | 0xffff0000;
 753     fpu->ErrorOffset   = fpux->ErrorOffset;
 754     fpu->ErrorSelector = fpux->ErrorSelector | (fpux->ErrorOpcode << 16);
 755     fpu->DataOffset    = fpux->DataOffset;
 756     fpu->DataSelector  = fpux->DataSelector;
 757     fpu->Cr0NpxState   = fpux->StatusWord | 0xffff0000;
 758
 759     stack_top = (fpux->StatusWord >> 11) & 7;
 760     fpu->TagWord = 0xffff0000;
 761     for (i = 0; i < 8; i++)
 762     {
 763         memcpy( &fpu->RegisterArea[10 * i], &fpux->FloatRegisters[i], 10 );
 764         if (!(fpux->TagWord & (1 << i))) tag = 3;  /* empty */
 765         else
 766         {
 767             const M128A *reg = &fpux->FloatRegisters[(i - stack_top) & 7];
 768             if ((reg->High & 0x7fff) == 0x7fff)  /* exponent all ones */
 769             {
 770                 tag = 2;  /* special */
 771             }
 772             else if (!(reg->High & 0x7fff))  /* exponent all zeroes */
 773             {
 774                 if (reg->Low) tag = 2;  /* special */
 775                 else tag = 1;  /* zero */
 776             }
 777             else
 778             {
 779                 if (reg->Low >> 63) tag = 0;  /* valid */
 780                 else tag = 2;  /* special */
 781             }
 782         }
 783         fpu->TagWord |= tag << (2 * i);
 784     }
 785 }
 786
 787
 788 /***********************************************************************
 789  *           save_context
 790  *
 791  * Build a context structure from the signal info.
 792  */
 793 static inline void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
 794 {
 795     struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
 796     FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
 797     XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
 798
 799     memset(context, 0, sizeof(*context));
 800     context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
 801     context->Eax          = EAX_sig(sigcontext);
 802     context->Ebx          = EBX_sig(sigcontext);
 803     context->Ecx          = ECX_sig(sigcontext);
 804     context->Edx          = EDX_sig(sigcontext);
 805     context->Esi          = ESI_sig(sigcontext);
 806     context->Edi          = EDI_sig(sigcontext);
 807     context->Ebp          = EBP_sig(sigcontext);
 808     context->EFlags       = EFL_sig(sigcontext);
 809     context->Eip          = EIP_sig(sigcontext);
 810     context->Esp          = ESP_sig(sigcontext);
 811     context->SegCs        = LOWORD(CS_sig(sigcontext));
 812     context->SegDs        = LOWORD(DS_sig(sigcontext));
 813     context->SegEs        = LOWORD(ES_sig(sigcontext));
 814     context->SegFs        = fs;
 815     context->SegGs        = gs;
 816     context->SegSs        = LOWORD(SS_sig(sigcontext));
 817     context->Dr0          = regs->dr0;
 818     context->Dr1          = regs->dr1;
 819     context->Dr2          = regs->dr2;
 820     context->Dr3          = regs->dr3;
 821     context->Dr6          = regs->dr6;
 822     context->Dr7          = regs->dr7;
 823
 824     if (fpu)
 825     {
 826         context->ContextFlags |= CONTEXT_FLOATING_POINT;
 827         context->FloatSave = *fpu;
 828     }
 829     if (fpux)
 830     {
 831         context->ContextFlags |= CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
 832         memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) );
 833         fpux_support = 1;
 834         if (!fpu) fpux_to_fpu( &context->FloatSave, fpux );
 835     }
 836     if (!fpu && !fpux) save_fpu( context );
 837 }
 838
 839
 840 /***********************************************************************
 841  *           restore_context
 842  *
 843  * Restore the signal info from the context.
 844  */
 845 static inline void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
 846 {
 847     struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
 848     FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
 849     XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
 850
 851     regs->dr0 = context->Dr0;
 852     regs->dr1 = context->Dr1;
 853     regs->dr2 = context->Dr2;
 854     regs->dr3 = context->Dr3;
 855     regs->dr6 = context->Dr6;
 856     regs->dr7 = context->Dr7;
 857     EAX_sig(sigcontext) = context->Eax;
 858     EBX_sig(sigcontext) = context->Ebx;
 859     ECX_sig(sigcontext) = context->Ecx;
 860     EDX_sig(sigcontext) = context->Edx;
 861     ESI_sig(sigcontext) = context->Esi;
 862     EDI_sig(sigcontext) = context->Edi;
 863     EBP_sig(sigcontext) = context->Ebp;
 864     EFL_sig(sigcontext) = context->EFlags;
 865     EIP_sig(sigcontext) = context->Eip;
 866     ESP_sig(sigcontext) = context->Esp;
 867     CS_sig(sigcontext)  = context->SegCs;
 868     DS_sig(sigcontext)  = context->SegDs;
 869     ES_sig(sigcontext)  = context->SegEs;
 870     SS_sig(sigcontext)  = context->SegSs;
 871 #ifdef GS_sig
 872     GS_sig(sigcontext)  = context->SegGs;
 873 #else
 874     wine_set_gs( context->SegGs );
 875 #endif
 876 #ifdef FS_sig
 877     FS_sig(sigcontext)  = context->SegFs;
 878 #else
 879     wine_set_fs( context->SegFs );
 880 #endif
 881
 882     if (fpu) *fpu = context->FloatSave;
 883     if (fpux) memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) );
 884     if (!fpu && !fpux) restore_fpu( context );
 885 }
 886
 887
 888 /***********************************************************************
 889  *              get_cpu_context
 890  *
 891  * Register function to get the context of the current thread.
 892  */
 893 void WINAPI __regs_get_cpu_context( CONTEXT *context, CONTEXT *regs )
 894 {
 895     *context = *regs;
 896     if (fpux_support) save_fpux( context );
 897     else save_fpu( context );
 898 }
 899 DEFINE_REGS_ENTRYPOINT( get_cpu_context, 4, 4 )
 900
 901
 902 /***********************************************************************
 903  *           set_cpu_context
 904  *
 905  * Set the new CPU context. Used by NtSetContextThread.
 906  */
 907 void set_cpu_context( const CONTEXT *context )
 908 {
 909     DWORD flags = context->ContextFlags & ~CONTEXT_i386;
 910
 911     if ((flags & CONTEXT_EXTENDED_REGISTERS) && fpux_support) restore_fpux( context );
 912     else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
 913
 914     if (flags & CONTEXT_DEBUG_REGISTERS)
 915     {
 916         struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
 917         regs->dr0 = context->Dr0;
 918         regs->dr1 = context->Dr1;
 919         regs->dr2 = context->Dr2;
 920         regs->dr3 = context->Dr3;
 921         regs->dr6 = context->Dr6;
 922         regs->dr7 = context->Dr7;
 923     }
 924     if (flags & CONTEXT_FULL)
 925     {
 926         if (!(flags & CONTEXT_CONTROL))
 927             FIXME( "setting partial context (%x) not supported\n", flags );
 928         else if (flags & CONTEXT_SEGMENTS)
 929             __wine_call_from_32_restore_regs( context );
 930         else
 931         {
 932             CONTEXT newcontext = *context;
 933             newcontext.SegDs = wine_get_ds();
 934             newcontext.SegEs = wine_get_es();
 935             newcontext.SegFs = wine_get_fs();
 936             newcontext.SegGs = wine_get_gs();
 937             __wine_call_from_32_restore_regs( &newcontext );
 938         }
 939     }
 940 }
 941
 942
 943 /***********************************************************************
 944  *           is_privileged_instr
 945  *
 946  * Check if the fault location is a privileged instruction.
 947  * Based on the instruction emulation code in dlls/kernel/instr.c.
 948  */
 949 static inline DWORD is_privileged_instr( CONTEXT86 *context )
 950 {
 951     const BYTE *instr;
 952     unsigned int prefix_count = 0;
 953
 954     if (!wine_ldt_is_system( context->SegCs )) return 0;
 955     instr = (BYTE *)context->Eip;
 956
 957     for (;;) switch(*instr)
 958     {
 959     /* instruction prefixes */
 960     case 0x2e:  /* %cs: */
 961     case 0x36:  /* %ss: */
 962     case 0x3e:  /* %ds: */
 963     case 0x26:  /* %es: */
 964     case 0x64:  /* %fs: */
 965     case 0x65:  /* %gs: */
 966     case 0x66:  /* opcode size */
 967     case 0x67:  /* addr size */
 968     case 0xf0:  /* lock */
 969     case 0xf2:  /* repne */
 970     case 0xf3:  /* repe */
 971         if (++prefix_count >= 15) return EXCEPTION_ILLEGAL_INSTRUCTION;
 972         instr++;
 973         continue;
 974
 975     case 0x0f: /* extended instruction */
 976         switch(instr[1])
 977         {
 978         case 0x20: /* mov crX, reg */
 979         case 0x21: /* mov drX, reg */
 980         case 0x22: /* mov reg, crX */
 981         case 0x23: /* mov reg drX */
 982             return EXCEPTION_PRIV_INSTRUCTION;
 983         }
 984         return 0;
 985     case 0x6c: /* insb (%dx) */
 986     case 0x6d: /* insl (%dx) */
 987     case 0x6e: /* outsb (%dx) */
 988     case 0x6f: /* outsl (%dx) */
 989     case 0xcd: /* int $xx */
 990     case 0xe4: /* inb al,XX */
 991     case 0xe5: /* in (e)ax,XX */
 992     case 0xe6: /* outb XX,al */
 993     case 0xe7: /* out XX,(e)ax */
 994     case 0xec: /* inb (%dx),%al */
 995     case 0xed: /* inl (%dx),%eax */
 996     case 0xee: /* outb %al,(%dx) */
 997     case 0xef: /* outl %eax,(%dx) */
 998     case 0xf4: /* hlt */
 999     case 0xfa: /* cli */
1000     case 0xfb: /* sti */
1001         return EXCEPTION_PRIV_INSTRUCTION;
1002     default:
1003         return 0;
1004     }
1005 }
1006
1007
1008 #include "pshpack1.h"
1009 struct atl_thunk
1010 {
1011     DWORD movl;  /* movl this,4(%esp) */
1012     DWORD this;
1013     BYTE  jmp;   /* jmp func */
1014     int   func;
1015 };
1016 #include "poppack.h"
1017
1018 /**********************************************************************
1019  *              check_atl_thunk
1020  *
1021  * Check if code destination is an ATL thunk, and emulate it if so.
1022  */
1023 static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context )
1024 {
1025     const struct atl_thunk *thunk = (const struct atl_thunk *)rec->ExceptionInformation[1];
1026     BOOL ret = FALSE;
1027
1028     __TRY
1029     {
1030         if (thunk->movl == 0x042444c7 && thunk->jmp == 0xe9)
1031         {
1032             *((DWORD *)context->Esp + 1) = thunk->this;
1033             context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func;
1034             TRACE( "emulating ATL thunk at %p, func=%08x arg=%08x\n",
1035                    thunk, context->Eip, *((DWORD *)context->Esp + 1) );
1036             ret = TRUE;
1037         }
1038     }
1039     __EXCEPT_PAGE_FAULT
1040     {
1041         return FALSE;
1042     }
1043     __ENDTRY
1044     return ret;
1045 }
1046
1047
1048 /***********************************************************************
1049  *           setup_exception_record
1050  *
1051  * Setup the exception record and context on the thread stack.
1052  */
1053 static EXCEPTION_RECORD *setup_exception_record( SIGCONTEXT *sigcontext, void *stack_ptr,
1054                                                  WORD fs, WORD gs, raise_func func )
1055 {
1056     struct stack_layout
1057     {
1058         void             *ret_addr;      /* return address from raise_func */
1059         EXCEPTION_RECORD *rec_ptr;       /* first arg for raise_func */
1060         CONTEXT          *context_ptr;   /* second arg for raise_func */
1061         CONTEXT           context;
1062         EXCEPTION_RECORD  rec;
1063         DWORD             ebp;
1064         DWORD             eip;
1065     } *stack = stack_ptr;
1066     DWORD exception_code = 0;
1067
1068     /* stack sanity checks */
1069
1070     if ((char *)stack >= (char *)get_signal_stack() &&
1071         (char *)stack < (char *)get_signal_stack() + signal_stack_size)
1072     {
1073         WINE_ERR( "nested exception on signal stack in thread %04x eip %08x esp %08x stack %p-%p\n",
1074                   GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1075                   (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1076                   NtCurrentTeb()->Tib.StackBase );
1077         server_abort_thread(1);
1078     }
1079
1080     if (stack - 1 > stack || /* check for overflow in subtraction */
1081         (char *)stack <= (char *)NtCurrentTeb()->DeallocationStack ||
1082         (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
1083     {
1084         WARN( "exception outside of stack limits in thread %04x eip %08x esp %08x stack %p-%p\n",
1085               GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1086               (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1087               NtCurrentTeb()->Tib.StackBase );
1088     }
1089     else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->DeallocationStack + 4096)
1090     {
1091         /* stack overflow on last page, unrecoverable */
1092         UINT diff = (char *)NtCurrentTeb()->DeallocationStack + 4096 - (char *)(stack - 1);
1093         WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1094                   diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1095                   (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1096                   NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1097         server_abort_thread(1);
1098     }
1099     else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit)
1100     {
1101         /* stack access below stack limit, may be recoverable */
1102         if (virtual_handle_stack_fault( stack - 1 )) exception_code = EXCEPTION_STACK_OVERFLOW;
1103         else
1104         {
1105             UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)(stack - 1);
1106             WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1107                       diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1108                       (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1109                       NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1110             server_abort_thread(1);
1111         }
1112     }
1113
1114     stack--;  /* push the stack_layout structure */
1115 #if defined(VALGRIND_MAKE_MEM_UNDEFINED)
1116     VALGRIND_MAKE_MEM_UNDEFINED(stack, sizeof(*stack));
1117 #elif defined(VALGRIND_MAKE_WRITABLE)
1118     VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack));
1119 #endif
1120     stack->ret_addr     = (void *)0xdeadbabe;  /* raise_func must not return */
1121     stack->rec_ptr      = &stack->rec;
1122     stack->context_ptr  = &stack->context;
1123
1124     stack->rec.ExceptionRecord  = NULL;
1125     stack->rec.ExceptionCode    = exception_code;
1126     stack->rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
1127     stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
1128     stack->rec.NumberParameters = 0;
1129
1130     save_context( &stack->context, sigcontext, fs, gs );
1131
1132     /* now modify the sigcontext to return to the raise function */
1133     ESP_sig(sigcontext) = (DWORD)stack;
1134     EIP_sig(sigcontext) = (DWORD)func;
1135     /* clear single-step, direction, and align check flag */
1136     EFL_sig(sigcontext) &= ~(0x100|0x400|0x40000);
1137     CS_sig(sigcontext)  = wine_get_cs();
1138     DS_sig(sigcontext)  = wine_get_ds();
1139     ES_sig(sigcontext)  = wine_get_es();
1140     FS_sig(sigcontext)  = wine_get_fs();
1141     GS_sig(sigcontext)  = wine_get_gs();
1142     SS_sig(sigcontext)  = wine_get_ss();
1143
1144     return stack->rec_ptr;
1145 }
1146
1147
1148 /***********************************************************************
1149  *           setup_exception
1150  *
1151  * Setup a proper stack frame for the raise function, and modify the
1152  * sigcontext so that the return from the signal handler will call
1153  * the raise function.
1154  */
1155 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
1156 {
1157     WORD fs, gs;
1158     void *stack = init_handler( sigcontext, &fs, &gs );
1159
1160     return setup_exception_record( sigcontext, stack, fs, gs, func );
1161 }
1162
1163
1164 /***********************************************************************
1165  *           get_exception_context
1166  *
1167  * Get a pointer to the context built by setup_exception.
1168  */
1169 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
1170 {
1171     return (CONTEXT *)rec - 1;  /* cf. stack_layout structure */
1172 }
1173
1174
1175 /**********************************************************************
1176  *              get_fpu_code
1177  *
1178  * Get the FPU exception code from the FPU status.
1179  */
1180 static inline DWORD get_fpu_code( const CONTEXT *context )
1181 {
1182     DWORD status = context->FloatSave.StatusWord;
1183
1184     if (status & 0x01)  /* IE */
1185     {
1186         if (status & 0x40)  /* SF */
1187             return EXCEPTION_FLT_STACK_CHECK;
1188         else
1189             return EXCEPTION_FLT_INVALID_OPERATION;
1190     }
1191     if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND;  /* DE flag */
1192     if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO;    /* ZE flag */
1193     if (status & 0x08) return EXCEPTION_FLT_OVERFLOW;          /* OE flag */
1194     if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW;         /* UE flag */
1195     if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT;    /* PE flag */
1196     return EXCEPTION_FLT_INVALID_OPERATION;  /* generic error */
1197 }
1198
1199
1200 /**********************************************************************
1201  *              raise_segv_exception
1202  */
1203 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1204 {
1205     switch(rec->ExceptionCode)
1206     {
1207     case EXCEPTION_ACCESS_VIOLATION:
1208         if (rec->NumberParameters == 2)
1209         {
1210             if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT && check_atl_thunk( rec, context ))
1211                 goto done;
1212             if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
1213                                                              rec->ExceptionInformation[0] )))
1214                 goto done;
1215         }
1216         break;
1217     case EXCEPTION_DATATYPE_MISALIGNMENT:
1218         /* FIXME: pass through exception handler first? */
1219         if (context->EFlags & 0x00040000)
1220         {
1221             /* Disable AC flag, return */
1222             context->EFlags &= ~0x00040000;
1223             goto done;
1224         }
1225         break;
1226     }
1227     __regs_RtlRaiseException( rec, context );
1228 done:
1229     NtSetContextThread( GetCurrentThread(), context );
1230 }
1231
1232
1233 /**********************************************************************
1234  *              raise_trap_exception
1235  */
1236 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1237 {
1238     if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
1239     {
1240         struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
1241
1242         /* when single stepping can't tell whether this is a hw bp or a
1243          * single step interrupt. try to avoid as much overhead as possible
1244          * and only do a server call if there is any hw bp enabled. */
1245
1246         if( !(context->EFlags & 0x100) || (regs->dr7 & 0xff) )
1247         {
1248             /* (possible) hardware breakpoint, fetch the debug registers */
1249             context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
1250             NtGetContextThread(GetCurrentThread(), context);
1251             context->ContextFlags |= CONTEXT_FULL;  /* restore flags */
1252         }
1253
1254         context->EFlags &= ~0x100;  /* clear single-step flag */
1255     }
1256
1257     __regs_RtlRaiseException( rec, context );
1258     NtSetContextThread( GetCurrentThread(), context );
1259 }
1260
1261
1262 /**********************************************************************
1263  *              raise_exception
1264  *
1265  * Generic raise function for exceptions that don't need special treatment.
1266  */
1267 static void WINAPI raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1268 {
1269     __regs_RtlRaiseException( rec, context );
1270     NtSetContextThread( GetCurrentThread(), context );
1271 }
1272
1273
1274 #ifdef __HAVE_VM86
1275 /**********************************************************************
1276  *              raise_vm86_sti_exception
1277  */
1278 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1279 {
1280     /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
1281     get_vm86_teb_info()->vm86_pending |= VIP_FLAG;
1282
1283     if (ntdll_get_thread_data()->vm86_ptr)
1284     {
1285         if (((char*)context->Eip >= (char*)vm86_return) &&
1286             ((char*)context->Eip <= (char*)vm86_return_end) &&
1287             (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
1288             /* exiting from VM86, can't throw */
1289             goto done;
1290         }
1291         merge_vm86_pending_flags( rec );
1292     }
1293     else if (get_vm86_teb_info()->dpmi_vif &&
1294              !wine_ldt_is_system(context->SegCs) &&
1295              !wine_ldt_is_system(context->SegSs))
1296     {
1297         /* Executing DPMI code and virtual interrupts are enabled. */
1298         get_vm86_teb_info()->vm86_pending = 0;
1299         __regs_RtlRaiseException( rec, context );
1300     }
1301 done:
1302     NtSetContextThread( GetCurrentThread(), context );
1303 }
1304
1305
1306 /**********************************************************************
1307  *              usr2_handler
1308  *
1309  * Handler for SIGUSR2.
1310  * We use it to signal that the running __wine_enter_vm86() should
1311  * immediately set VIP_FLAG, causing pending events to be handled
1312  * as early as possible.
1313  */
1314 static void usr2_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1315 {
1316     EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_vm86_sti_exception );
1317     rec->ExceptionCode = EXCEPTION_VM86_STI;
1318 }
1319 #endif /* __HAVE_VM86 */
1320
1321
1322 /**********************************************************************
1323  *              segv_handler
1324  *
1325  * Handler for SIGSEGV and related errors.
1326  */
1327 static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1328 {
1329     WORD fs, gs;
1330     EXCEPTION_RECORD *rec;
1331     SIGCONTEXT *context = sigcontext;
1332     void *stack = init_handler( sigcontext, &fs, &gs );
1333
1334     /* check for page fault inside the thread stack */
1335     if (get_trap_code(context) == TRAP_x86_PAGEFLT &&
1336         (char *)siginfo->si_addr >= (char *)NtCurrentTeb()->DeallocationStack &&
1337         (char *)siginfo->si_addr < (char *)NtCurrentTeb()->Tib.StackBase &&
1338         virtual_handle_stack_fault( siginfo->si_addr ))
1339     {
1340         /* check if this was the last guard page */
1341         if ((char *)siginfo->si_addr < (char *)NtCurrentTeb()->DeallocationStack + 2*4096)
1342         {
1343             rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1344             rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1345         }
1346         return;
1347     }
1348
1349     rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1350     if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return;
1351
1352     switch(get_trap_code(context))
1353     {
1354     case TRAP_x86_OFLOW:   /* Overflow exception */
1355         rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
1356         break;
1357     case TRAP_x86_BOUND:   /* Bound range exception */
1358         rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
1359         break;
1360     case TRAP_x86_PRIVINFLT:   /* Invalid opcode exception */
1361         rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1362         break;
1363     case TRAP_x86_STKFLT:  /* Stack fault */
1364         rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1365         break;
1366     case TRAP_x86_SEGNPFLT:  /* Segment not present exception */
1367     case TRAP_x86_PROTFLT:   /* General protection fault */
1368     case TRAP_x86_UNKNOWN:   /* Unknown fault code */
1369         {
1370             WORD err = get_error_code(context);
1371             if (!err && (rec->ExceptionCode = is_privileged_instr( get_exception_context(rec) ))) break;
1372             rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1373             rec->NumberParameters = 2;
1374             rec->ExceptionInformation[0] = 0;
1375             /* if error contains a LDT selector, use that as fault address */
1376             if ((err & 7) == 4 && !wine_ldt_is_system( err | 7 ))
1377                 rec->ExceptionInformation[1] = err & ~7;
1378             else
1379                 rec->ExceptionInformation[1] = 0xffffffff;
1380         }
1381         break;
1382     case TRAP_x86_PAGEFLT:  /* Page fault */
1383         rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1384         rec->NumberParameters = 2;
1385         rec->ExceptionInformation[0] = (get_error_code(context) >> 1) & 0x09;
1386         rec->ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
1387         break;
1388     case TRAP_x86_ALIGNFLT:  /* Alignment check exception */
1389         rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
1390         break;
1391     default:
1392         WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1393         /* fall through */
1394     case TRAP_x86_NMI:       /* NMI interrupt */
1395     case TRAP_x86_DNA:       /* Device not available exception */
1396     case TRAP_x86_DOUBLEFLT: /* Double fault exception */
1397     case TRAP_x86_TSSFLT:    /* Invalid TSS exception */
1398     case TRAP_x86_MCHK:      /* Machine check exception */
1399     case TRAP_x86_CACHEFLT:  /* Cache flush exception */
1400         rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1401         break;
1402     }
1403 }
1404
1405
1406 /**********************************************************************
1407  *              trap_handler
1408  *
1409  * Handler for SIGTRAP.
1410  */
1411 static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1412 {
1413     SIGCONTEXT *context = sigcontext;
1414     EXCEPTION_RECORD *rec = setup_exception( context, raise_trap_exception );
1415
1416     switch(get_trap_code(context))
1417     {
1418     case TRAP_x86_TRCTRAP:  /* Single-step exception */
1419         rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1420         break;
1421     case TRAP_x86_BPTFLT:   /* Breakpoint exception */
1422         rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1;  /* back up over the int3 instruction */
1423         /* fall through */
1424     default:
1425         rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1426         break;
1427     }
1428 }
1429
1430
1431 /**********************************************************************
1432  *              fpe_handler
1433  *
1434  * Handler for SIGFPE.
1435  */
1436 static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1437 {
1438     CONTEXT *win_context;
1439     SIGCONTEXT *context = sigcontext;
1440     EXCEPTION_RECORD *rec = setup_exception( context, raise_exception );
1441
1442     win_context = get_exception_context( rec );
1443
1444     switch(get_trap_code(context))
1445     {
1446     case TRAP_x86_DIVIDE:   /* Division by zero exception */
1447         rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1448         break;
1449     case TRAP_x86_FPOPFLT:   /* Coprocessor segment overrun */
1450         rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1451         break;
1452     case TRAP_x86_ARITHTRAP:  /* Floating point exception */
1453     case TRAP_x86_UNKNOWN:    /* Unknown fault code */
1454         rec->ExceptionCode = get_fpu_code( win_context );
1455         break;
1456     case TRAP_x86_CACHEFLT:  /* SIMD exception */
1457         /* TODO:
1458          * Behaviour only tested for divide-by-zero exceptions
1459          * Check for other SIMD exceptions as well */
1460         if(siginfo->si_code != FPE_FLTDIV)
1461             FIXME("untested SIMD exception: %#x. Might not work correctly\n",
1462                   siginfo->si_code);
1463
1464         rec->ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS;
1465         rec->NumberParameters = 1;
1466         /* no idea what meaning is actually behind this but that's what native does */
1467         rec->ExceptionInformation[0] = 0;
1468         break;
1469     default:
1470         WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1471         rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1472         break;
1473     }
1474 }
1475
1476
1477 /**********************************************************************
1478  *              int_handler
1479  *
1480  * Handler for SIGINT.
1481  *
1482  * FIXME: should not be calling external functions on the signal stack.
1483  */
1484 static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1485 {
1486     WORD fs, gs;
1487     init_handler( sigcontext, &fs, &gs );
1488     if (!dispatch_signal(SIGINT))
1489     {
1490         EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1491         rec->ExceptionCode = CONTROL_C_EXIT;
1492     }
1493 }
1494
1495 /**********************************************************************
1496  *              abrt_handler
1497  *
1498  * Handler for SIGABRT.
1499  */
1500 static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1501 {
1502     EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1503     rec->ExceptionCode  = EXCEPTION_WINE_ASSERTION;
1504     rec->ExceptionFlags = EH_NONCONTINUABLE;
1505 }
1506
1507
1508 /**********************************************************************
1509  *              quit_handler
1510  *
1511  * Handler for SIGQUIT.
1512  */
1513 static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1514 {
1515     WORD fs, gs;
1516     init_handler( sigcontext, &fs, &gs );
1517     server_abort_thread(0);
1518 }
1519
1520
1521 /**********************************************************************
1522  *              usr1_handler
1523  *
1524  * Handler for SIGUSR1, used to signal a thread that it got suspended.
1525  */
1526 static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1527 {
1528     CONTEXT context;
1529     WORD fs, gs;
1530
1531     init_handler( sigcontext, &fs, &gs );
1532     save_context( &context, sigcontext, fs, gs );
1533     wait_suspend( &context );
1534     restore_context( &context, sigcontext );
1535 }
1536
1537
1538 /**********************************************************************
1539  *              get_signal_stack_total_size
1540  *
1541  * Retrieve the size to allocate for the signal stack, including the TEB at the bottom.
1542  * Must be a power of two.
1543  */
1544 size_t get_signal_stack_total_size(void)
1545 {
1546     static const size_t teb_size = 4096;  /* we reserve one page for the TEB */
1547
1548     if (!signal_stack_size)
1549     {
1550         size_t size = 8192, min_size = teb_size + max( MINSIGSTKSZ, 8192 );
1551         /* find the first power of two not smaller than min_size */
1552         while (size < min_size) size *= 2;
1553         signal_stack_mask = size - 1;
1554         signal_stack_size = size - teb_size;
1555     }
1556     return signal_stack_size + teb_size;
1557 }
1558
1559
1560 /***********************************************************************
1561  *           __wine_set_signal_handler   (NTDLL.@)
1562  */
1563 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1564 {
1565     if (sig >= sizeof(handlers) / sizeof(handlers[0])) return -1;
1566     if (handlers[sig] != NULL) return -2;
1567     handlers[sig] = wsh;
1568     return 0;
1569 }
1570
1571
1572 /**********************************************************************
1573  *              signal_init_thread
1574  */
1575 void signal_init_thread(void)
1576 {
1577 #ifdef HAVE_SIGALTSTACK
1578     stack_t ss;
1579
1580 #ifdef __APPLE__
1581     int mib[2], val = 1;
1582
1583     mib[0] = CTL_KERN;
1584     mib[1] = KERN_THALTSTACK;
1585     sysctl( mib, 2, NULL, NULL, &val, sizeof(val) );
1586 #endif
1587
1588     ss.ss_sp    = get_signal_stack();
1589     ss.ss_size  = signal_stack_size;
1590     ss.ss_flags = 0;
1591     if (sigaltstack(&ss, NULL) == -1) perror( "sigaltstack" );
1592 #endif  /* HAVE_SIGALTSTACK */
1593
1594     ntdll_get_thread_data()->gs = wine_get_gs();
1595 }
1596
1597 /**********************************************************************
1598  *              signal_init_process
1599  */
1600 void signal_init_process(void)
1601 {
1602     struct sigaction sig_act;
1603
1604     sig_act.sa_mask = server_block_set;
1605     sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1606 #ifdef SA_ONSTACK
1607     sig_act.sa_flags |= SA_ONSTACK;
1608 #endif
1609
1610     sig_act.sa_sigaction = int_handler;
1611     if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
1612     sig_act.sa_sigaction = fpe_handler;
1613     if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
1614     sig_act.sa_sigaction = abrt_handler;
1615     if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
1616     sig_act.sa_sigaction = quit_handler;
1617     if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
1618     sig_act.sa_sigaction = usr1_handler;
1619     if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
1620
1621     sig_act.sa_sigaction = segv_handler;
1622     if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
1623     if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
1624 #ifdef SIGBUS
1625     if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
1626 #endif
1627
1628 #ifdef SIGTRAP
1629     sig_act.sa_sigaction = trap_handler;
1630     if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
1631 #endif
1632
1633 #ifdef __HAVE_VM86
1634     sig_act.sa_sigaction = usr2_handler;
1635     if (sigaction( SIGUSR2, &sig_act, NULL ) == -1) goto error;
1636 #endif
1637
1638     signal_init_thread();
1639     return;
1640
1641  error:
1642     perror("sigaction");
1643     exit(1);
1644 }
1645
1646
1647 #ifdef __HAVE_VM86
1648 /**********************************************************************
1649  *              __wine_enter_vm86   (NTDLL.@)
1650  *
1651  * Enter vm86 mode with the specified register context.
1652  */
1653 void __wine_enter_vm86( CONTEXT *context )
1654 {
1655     EXCEPTION_RECORD rec;
1656     int res;
1657     struct vm86plus_struct vm86;
1658
1659     memset( &vm86, 0, sizeof(vm86) );
1660     for (;;)
1661     {
1662         restore_vm86_context( context, &vm86 );
1663
1664         ntdll_get_thread_data()->vm86_ptr = &vm86;
1665         merge_vm86_pending_flags( &rec );
1666
1667         res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1668         if (res < 0)
1669         {
1670             errno = -res;
1671             return;
1672         }
1673
1674         save_vm86_context( context, &vm86 );
1675
1676         rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
1677         rec.ExceptionRecord  = NULL;
1678         rec.ExceptionAddress = (LPVOID)context->Eip;
1679         rec.NumberParameters = 0;
1680
1681         switch(VM86_TYPE(res))
1682         {
1683         case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1684             rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1685             break;
1686         case VM86_TRAP: /* return due to DOS-debugger request */
1687             switch(VM86_ARG(res))
1688             {
1689             case TRAP_x86_TRCTRAP:  /* Single-step exception */
1690                 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
1691                 break;
1692             case TRAP_x86_BPTFLT:   /* Breakpoint exception */
1693                 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1;  /* back up over the int3 instruction */
1694                 /* fall through */
1695             default:
1696                 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
1697                 break;
1698             }
1699             break;
1700         case VM86_INTx: /* int3/int x instruction (ARG = x) */
1701             rec.ExceptionCode = EXCEPTION_VM86_INTx;
1702             rec.NumberParameters = 1;
1703             rec.ExceptionInformation[0] = VM86_ARG(res);
1704             break;
1705         case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1706             context->EFlags |= VIF_FLAG;
1707             context->EFlags &= ~VIP_FLAG;
1708             get_vm86_teb_info()->vm86_pending = 0;
1709             rec.ExceptionCode = EXCEPTION_VM86_STI;
1710             break;
1711         case VM86_PICRETURN: /* return due to pending PIC request */
1712             rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1713             break;
1714         case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
1715         default:
1716             WINE_ERR( "unhandled result from vm86 mode %x\n", res );
1717             continue;
1718         }
1719         __regs_RtlRaiseException( &rec, context );
1720     }
1721 }
1722
1723 #else /* __HAVE_VM86 */
1724 /**********************************************************************
1725  *              __wine_enter_vm86   (NTDLL.@)
1726  */
1727 void __wine_enter_vm86( CONTEXT *context )
1728 {
1729     MESSAGE("vm86 mode not supported on this platform\n");
1730 }
1731 #endif /* __HAVE_VM86 */
1732
1733 /**********************************************************************
1734  *              DbgBreakPoint   (NTDLL.@)
1735  */
1736 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret")
1737
1738 /**********************************************************************
1739  *              DbgUserBreakPoint   (NTDLL.@)
1740  */
1741 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret")
1742
1743
1744 /**********************************************************************
1745  *              EXC_CallHandler   (internal)
1746  *
1747  * Some exception handlers depend on EBP to have a fixed position relative to
1748  * the exception frame.
1749  * Shrinker depends on (*1) doing what it does,
1750  * (*2) being the exact instruction it is and (*3) beginning with 0x64
1751  * (i.e. the %fs prefix to the movl instruction). It also depends on the
1752  * function calling the handler having only 5 parameters (*4).
1753  */
1754 __ASM_GLOBAL_FUNC( EXC_CallHandler,
1755 "       pushl   %ebp\n"
1756 "       movl    %esp, %ebp\n"
1757 "       pushl   %ebx\n"
1758 "       movl    28(%ebp), %edx\n" /* ugly hack to pass the 6th param needed because of Shrinker */
1759 "       pushl   24(%ebp)\n"
1760 "       pushl   20(%ebp)\n"
1761 "       pushl   16(%ebp)\n"
1762 "       pushl   12(%ebp)\n"
1763 "       pushl   8(%ebp)\n"
1764 "       call    " __ASM_NAME("call_exception_handler") "\n"
1765 "       popl    %ebx\n"
1766 "       leave\n"
1767 "       ret\n"
1768 )
1769 __ASM_GLOBAL_FUNC(call_exception_handler,
1770 "       pushl   %ebp\n"
1771 "       movl    %esp, %ebp\n"
1772 "       subl    $12,%esp\n"
1773 "       pushl   12(%ebp)\n"       /* make any exceptions in this... */
1774 "       pushl   %edx\n"           /* handler be handled by... */
1775 "       .byte   0x64\n"
1776 "       pushl   (0)\n"            /* nested_handler (passed in edx). */
1777 "       .byte   0x64\n"
1778 "       movl    %esp,(0)\n"       /* push the new exception frame onto the exception stack. */
1779 "       pushl   20(%ebp)\n"
1780 "       pushl   16(%ebp)\n"
1781 "       pushl   12(%ebp)\n"
1782 "       pushl   8(%ebp)\n"
1783 "       movl    24(%ebp), %ecx\n" /* (*1) */
1784 "       call    *%ecx\n"          /* call handler. (*2) */
1785 "       .byte   0x64\n"
1786 "       movl    (0), %esp\n"      /* restore previous... (*3) */
1787 "       .byte   0x64\n"
1788 "       popl    (0)\n"            /* exception frame. */
1789 "       movl    %ebp, %esp\n"     /* restore saved stack, in case it was corrupted */
1790 "       popl    %ebp\n"
1791 "       ret     $20\n"            /* (*4) */
1792 )
1793 #endif  /* __i386__ */