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 typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
 579
 580
 581 /***********************************************************************
 582  *           init_handler
 583  *
 584  * Handler initialization when the full context is not needed.
 585  */
 586 static inline void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
 587 {
 588     void *stack = (void *)(ESP_sig(sigcontext) & ~3);
 589     TEB *teb = get_current_teb();
 590     struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SystemReserved2;
 591
 592     /* get %fs and %gs at time of the fault */
 593 #ifdef FS_sig
 594     *fs = LOWORD(FS_sig(sigcontext));
 595 #else
 596     *fs = wine_get_fs();
 597 #endif
 598 #ifdef GS_sig
 599     *gs = LOWORD(GS_sig(sigcontext));
 600 #else
 601     *gs = wine_get_gs();
 602 #endif
 603
 604     wine_set_fs( thread_data->fs );
 605
 606     /* now restore a proper %gs for the fault handler */
 607     if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
 608         !wine_ldt_is_system(SS_sig(sigcontext)))  /* 16-bit mode */
 609     {
 610         /*
 611          * Win16 or DOS protected mode. Note that during switch
 612          * from 16-bit mode to linear mode, CS may be set to system
 613          * segment before FS is restored. Fortunately, in this case
 614          * SS is still non-system segment. This is why both CS and SS
 615          * are checked.
 616          */
 617         wine_set_gs( thread_data->gs );
 618         stack = teb->WOW32Reserved;
 619     }
 620 #ifdef __HAVE_VM86
 621     else if ((void *)EIP_sig(sigcontext) == vm86_return)  /* vm86 mode */
 622     {
 623         unsigned int *int_stack = stack;
 624         /* fetch the saved %gs from the stack */
 625         wine_set_gs( int_stack[0] );
 626     }
 627 #endif
 628     else  /* 32-bit mode */
 629     {
 630 #ifdef GS_sig
 631         wine_set_gs( GS_sig(sigcontext) );
 632 #endif
 633     }
 634     return stack;
 635 }
 636
 637
 638 /***********************************************************************
 639  *           save_fpu
 640  *
 641  * Save the thread FPU context.
 642  */
 643 static inline void save_fpu( CONTEXT *context )
 644 {
 645 #ifdef __GNUC__
 646     context->ContextFlags |= CONTEXT_FLOATING_POINT;
 647     __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
 648 #endif
 649 }
 650
 651
 652 /***********************************************************************
 653  *           save_fpux
 654  *
 655  * Save the thread FPU extended context.
 656  */
 657 static inline void save_fpux( CONTEXT *context )
 658 {
 659 #ifdef __GNUC__
 660     /* we have to enforce alignment by hand */
 661     char buffer[sizeof(XMM_SAVE_AREA32) + 16];
 662     XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
 663
 664     __asm__ __volatile__( "fxsave %0" : "=m" (*state) );
 665     context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
 666     memcpy( context->ExtendedRegisters, state, sizeof(*state) );
 667 #endif
 668 }
 669
 670
 671 /***********************************************************************
 672  *           restore_fpu
 673  *
 674  * Restore the FPU context to a sigcontext.
 675  */
 676 static inline void restore_fpu( const CONTEXT *context )
 677 {
 678     FLOATING_SAVE_AREA float_status = context->FloatSave;
 679     /* reset the current interrupt status */
 680     float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
 681 #ifdef __GNUC__
 682     __asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
 683 #endif  /* __GNUC__ */
 684 }
 685
 686
 687 /***********************************************************************
 688  *           restore_fpux
 689  *
 690  * Restore the FPU extended context to a sigcontext.
 691  */
 692 static inline void restore_fpux( const 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     memcpy( state, context->ExtendedRegisters, sizeof(*state) );
 700     /* reset the current interrupt status */
 701     state->StatusWord &= state->ControlWord | 0xff80;
 702     __asm__ __volatile__( "fxrstor %0" : : "m" (*state) );
 703 #endif
 704 }
 705
 706
 707 /***********************************************************************
 708  *           fpux_to_fpu
 709  *
 710  * Build a standard FPU context from an extended one.
 711  */
 712 static void fpux_to_fpu( FLOATING_SAVE_AREA *fpu, const XMM_SAVE_AREA32 *fpux )
 713 {
 714     unsigned int i, tag, stack_top;
 715
 716     fpu->ControlWord   = fpux->ControlWord | 0xffff0000;
 717     fpu->StatusWord    = fpux->StatusWord | 0xffff0000;
 718     fpu->ErrorOffset   = fpux->ErrorOffset;
 719     fpu->ErrorSelector = fpux->ErrorSelector | (fpux->ErrorOpcode << 16);
 720     fpu->DataOffset    = fpux->DataOffset;
 721     fpu->DataSelector  = fpux->DataSelector;
 722     fpu->Cr0NpxState   = fpux->StatusWord | 0xffff0000;
 723
 724     stack_top = (fpux->StatusWord >> 11) & 7;
 725     fpu->TagWord = 0xffff0000;
 726     for (i = 0; i < 8; i++)
 727     {
 728         memcpy( &fpu->RegisterArea[10 * i], &fpux->FloatRegisters[i], 10 );
 729         if (!(fpux->TagWord & (1 << i))) tag = 3;  /* empty */
 730         else
 731         {
 732             const M128A *reg = &fpux->FloatRegisters[(i - stack_top) & 7];
 733             if ((reg->High & 0x7fff) == 0x7fff)  /* exponent all ones */
 734             {
 735                 tag = 2;  /* special */
 736             }
 737             else if (!(reg->High & 0x7fff))  /* exponent all zeroes */
 738             {
 739                 if (reg->Low) tag = 2;  /* special */
 740                 else tag = 1;  /* zero */
 741             }
 742             else
 743             {
 744                 if (reg->Low >> 63) tag = 0;  /* valid */
 745                 else tag = 2;  /* special */
 746             }
 747         }
 748         fpu->TagWord |= tag << (2 * i);
 749     }
 750 }
 751
 752
 753 /***********************************************************************
 754  *           save_context
 755  *
 756  * Build a context structure from the signal info.
 757  */
 758 static inline void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
 759 {
 760     struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
 761     FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
 762     XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
 763
 764     memset(context, 0, sizeof(*context));
 765     context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
 766     context->Eax          = EAX_sig(sigcontext);
 767     context->Ebx          = EBX_sig(sigcontext);
 768     context->Ecx          = ECX_sig(sigcontext);
 769     context->Edx          = EDX_sig(sigcontext);
 770     context->Esi          = ESI_sig(sigcontext);
 771     context->Edi          = EDI_sig(sigcontext);
 772     context->Ebp          = EBP_sig(sigcontext);
 773     context->EFlags       = EFL_sig(sigcontext);
 774     context->Eip          = EIP_sig(sigcontext);
 775     context->Esp          = ESP_sig(sigcontext);
 776     context->SegCs        = LOWORD(CS_sig(sigcontext));
 777     context->SegDs        = LOWORD(DS_sig(sigcontext));
 778     context->SegEs        = LOWORD(ES_sig(sigcontext));
 779     context->SegFs        = fs;
 780     context->SegGs        = gs;
 781     context->SegSs        = LOWORD(SS_sig(sigcontext));
 782     context->Dr0          = regs->dr0;
 783     context->Dr1          = regs->dr1;
 784     context->Dr2          = regs->dr2;
 785     context->Dr3          = regs->dr3;
 786     context->Dr6          = regs->dr6;
 787     context->Dr7          = regs->dr7;
 788
 789     if (fpu)
 790     {
 791         context->ContextFlags |= CONTEXT_FLOATING_POINT;
 792         context->FloatSave = *fpu;
 793     }
 794     if (fpux)
 795     {
 796         context->ContextFlags |= CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
 797         memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) );
 798         fpux_support = 1;
 799         if (!fpu) fpux_to_fpu( &context->FloatSave, fpux );
 800     }
 801     if (!fpu && !fpux) save_fpu( context );
 802 }
 803
 804
 805 /***********************************************************************
 806  *           restore_context
 807  *
 808  * Restore the signal info from the context.
 809  */
 810 static inline void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
 811 {
 812     struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
 813     FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
 814     XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
 815
 816     regs->dr0 = context->Dr0;
 817     regs->dr1 = context->Dr1;
 818     regs->dr2 = context->Dr2;
 819     regs->dr3 = context->Dr3;
 820     regs->dr6 = context->Dr6;
 821     regs->dr7 = context->Dr7;
 822     EAX_sig(sigcontext) = context->Eax;
 823     EBX_sig(sigcontext) = context->Ebx;
 824     ECX_sig(sigcontext) = context->Ecx;
 825     EDX_sig(sigcontext) = context->Edx;
 826     ESI_sig(sigcontext) = context->Esi;
 827     EDI_sig(sigcontext) = context->Edi;
 828     EBP_sig(sigcontext) = context->Ebp;
 829     EFL_sig(sigcontext) = context->EFlags;
 830     EIP_sig(sigcontext) = context->Eip;
 831     ESP_sig(sigcontext) = context->Esp;
 832     CS_sig(sigcontext)  = context->SegCs;
 833     DS_sig(sigcontext)  = context->SegDs;
 834     ES_sig(sigcontext)  = context->SegEs;
 835     SS_sig(sigcontext)  = context->SegSs;
 836 #ifdef GS_sig
 837     GS_sig(sigcontext)  = context->SegGs;
 838 #else
 839     wine_set_gs( context->SegGs );
 840 #endif
 841 #ifdef FS_sig
 842     FS_sig(sigcontext)  = context->SegFs;
 843 #else
 844     wine_set_fs( context->SegFs );
 845 #endif
 846
 847     if (fpu) *fpu = context->FloatSave;
 848     if (fpux) memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) );
 849     if (!fpu && !fpux) restore_fpu( context );
 850 }
 851
 852
 853 /***********************************************************************
 854  *              get_cpu_context
 855  *
 856  * Register function to get the context of the current thread.
 857  */
 858 void WINAPI __regs_get_cpu_context( CONTEXT *context, CONTEXT *regs )
 859 {
 860     *context = *regs;
 861     if (fpux_support) save_fpux( context );
 862     else save_fpu( context );
 863 }
 864 DEFINE_REGS_ENTRYPOINT( get_cpu_context, 4, 4 )
 865
 866
 867 /***********************************************************************
 868  *           set_cpu_context
 869  *
 870  * Set the new CPU context. Used by NtSetContextThread.
 871  */
 872 void set_cpu_context( const CONTEXT *context )
 873 {
 874     DWORD flags = context->ContextFlags & ~CONTEXT_i386;
 875
 876     if ((flags & CONTEXT_EXTENDED_REGISTERS) && fpux_support) restore_fpux( context );
 877     else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
 878
 879     if (flags & CONTEXT_DEBUG_REGISTERS)
 880     {
 881         struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
 882         regs->dr0 = context->Dr0;
 883         regs->dr1 = context->Dr1;
 884         regs->dr2 = context->Dr2;
 885         regs->dr3 = context->Dr3;
 886         regs->dr6 = context->Dr6;
 887         regs->dr7 = context->Dr7;
 888     }
 889     if (flags & CONTEXT_FULL)
 890     {
 891         if (!(flags & CONTEXT_CONTROL))
 892             FIXME( "setting partial context (%x) not supported\n", flags );
 893         else if (flags & CONTEXT_SEGMENTS)
 894             __wine_call_from_32_restore_regs( context );
 895         else
 896         {
 897             CONTEXT newcontext = *context;
 898             newcontext.SegDs = wine_get_ds();
 899             newcontext.SegEs = wine_get_es();
 900             newcontext.SegFs = wine_get_fs();
 901             newcontext.SegGs = wine_get_gs();
 902             __wine_call_from_32_restore_regs( &newcontext );
 903         }
 904     }
 905 }
 906
 907
 908 /***********************************************************************
 909  *           is_privileged_instr
 910  *
 911  * Check if the fault location is a privileged instruction.
 912  * Based on the instruction emulation code in dlls/kernel/instr.c.
 913  */
 914 static inline DWORD is_privileged_instr( CONTEXT86 *context )
 915 {
 916     const BYTE *instr;
 917     unsigned int prefix_count = 0;
 918
 919     if (!wine_ldt_is_system( context->SegCs )) return 0;
 920     instr = (BYTE *)context->Eip;
 921
 922     for (;;) switch(*instr)
 923     {
 924     /* instruction prefixes */
 925     case 0x2e:  /* %cs: */
 926     case 0x36:  /* %ss: */
 927     case 0x3e:  /* %ds: */
 928     case 0x26:  /* %es: */
 929     case 0x64:  /* %fs: */
 930     case 0x65:  /* %gs: */
 931     case 0x66:  /* opcode size */
 932     case 0x67:  /* addr size */
 933     case 0xf0:  /* lock */
 934     case 0xf2:  /* repne */
 935     case 0xf3:  /* repe */
 936         if (++prefix_count >= 15) return EXCEPTION_ILLEGAL_INSTRUCTION;
 937         instr++;
 938         continue;
 939
 940     case 0x0f: /* extended instruction */
 941         switch(instr[1])
 942         {
 943         case 0x20: /* mov crX, reg */
 944         case 0x21: /* mov drX, reg */
 945         case 0x22: /* mov reg, crX */
 946         case 0x23: /* mov reg drX */
 947             return EXCEPTION_PRIV_INSTRUCTION;
 948         }
 949         return 0;
 950     case 0x6c: /* insb (%dx) */
 951     case 0x6d: /* insl (%dx) */
 952     case 0x6e: /* outsb (%dx) */
 953     case 0x6f: /* outsl (%dx) */
 954     case 0xcd: /* int $xx */
 955     case 0xe4: /* inb al,XX */
 956     case 0xe5: /* in (e)ax,XX */
 957     case 0xe6: /* outb XX,al */
 958     case 0xe7: /* out XX,(e)ax */
 959     case 0xec: /* inb (%dx),%al */
 960     case 0xed: /* inl (%dx),%eax */
 961     case 0xee: /* outb %al,(%dx) */
 962     case 0xef: /* outl %eax,(%dx) */
 963     case 0xf4: /* hlt */
 964     case 0xfa: /* cli */
 965     case 0xfb: /* sti */
 966         return EXCEPTION_PRIV_INSTRUCTION;
 967     default:
 968         return 0;
 969     }
 970 }
 971
 972
 973 #include "pshpack1.h"
 974 struct atl_thunk
 975 {
 976     DWORD movl;  /* movl this,4(%esp) */
 977     DWORD this;
 978     BYTE  jmp;   /* jmp func */
 979     int   func;
 980 };
 981 #include "poppack.h"
 982
 983 /**********************************************************************
 984  *              check_atl_thunk
 985  *
 986  * Check if code destination is an ATL thunk, and emulate it if so.
 987  */
 988 static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context )
 989 {
 990     const struct atl_thunk *thunk = (const struct atl_thunk *)rec->ExceptionInformation[1];
 991     BOOL ret = FALSE;
 992
 993     __TRY
 994     {
 995         if (thunk->movl == 0x042444c7 && thunk->jmp == 0xe9)
 996         {
 997             *((DWORD *)context->Esp + 1) = thunk->this;
 998             context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func;
 999             TRACE( "emulating ATL thunk at %p, func=%08x arg=%08x\n",
1000                    thunk, context->Eip, *((DWORD *)context->Esp + 1) );
1001             ret = TRUE;
1002         }
1003     }
1004     __EXCEPT_PAGE_FAULT
1005     {
1006         return FALSE;
1007     }
1008     __ENDTRY
1009     return ret;
1010 }
1011
1012
1013 /***********************************************************************
1014  *           setup_exception_record
1015  *
1016  * Setup the exception record and context on the thread stack.
1017  */
1018 static EXCEPTION_RECORD *setup_exception_record( SIGCONTEXT *sigcontext, void *stack_ptr,
1019                                                  WORD fs, WORD gs, raise_func func )
1020 {
1021     struct stack_layout
1022     {
1023         void             *ret_addr;      /* return address from raise_func */
1024         EXCEPTION_RECORD *rec_ptr;       /* first arg for raise_func */
1025         CONTEXT          *context_ptr;   /* second arg for raise_func */
1026         CONTEXT           context;
1027         EXCEPTION_RECORD  rec;
1028         DWORD             ebp;
1029         DWORD             eip;
1030     } *stack = stack_ptr;
1031     DWORD exception_code = 0;
1032
1033     /* stack sanity checks */
1034
1035     if ((char *)stack >= (char *)get_signal_stack() &&
1036         (char *)stack < (char *)get_signal_stack() + signal_stack_size)
1037     {
1038         WINE_ERR( "nested exception on signal stack in thread %04x eip %08x esp %08x stack %p-%p\n",
1039                   GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1040                   (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1041                   NtCurrentTeb()->Tib.StackBase );
1042         server_abort_thread(1);
1043     }
1044
1045     if (stack - 1 > stack || /* check for overflow in subtraction */
1046         (char *)stack <= (char *)NtCurrentTeb()->DeallocationStack ||
1047         (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
1048     {
1049         WARN( "exception outside of stack limits in thread %04x eip %08x esp %08x stack %p-%p\n",
1050               GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1051               (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1052               NtCurrentTeb()->Tib.StackBase );
1053     }
1054     else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->DeallocationStack + 4096)
1055     {
1056         /* stack overflow on last page, unrecoverable */
1057         UINT diff = (char *)NtCurrentTeb()->DeallocationStack + 4096 - (char *)(stack - 1);
1058         WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1059                   diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1060                   (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1061                   NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1062         server_abort_thread(1);
1063     }
1064     else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit)
1065     {
1066         /* stack access below stack limit, may be recoverable */
1067         if (virtual_handle_stack_fault( stack - 1 )) exception_code = EXCEPTION_STACK_OVERFLOW;
1068         else
1069         {
1070             UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)(stack - 1);
1071             WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1072                       diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1073                       (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1074                       NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1075             server_abort_thread(1);
1076         }
1077     }
1078
1079     stack--;  /* push the stack_layout structure */
1080 #if defined(VALGRIND_MAKE_MEM_UNDEFINED)
1081     VALGRIND_MAKE_MEM_UNDEFINED(stack, sizeof(*stack));
1082 #elif defined(VALGRIND_MAKE_WRITABLE)
1083     VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack));
1084 #endif
1085     stack->ret_addr     = (void *)0xdeadbabe;  /* raise_func must not return */
1086     stack->rec_ptr      = &stack->rec;
1087     stack->context_ptr  = &stack->context;
1088
1089     stack->rec.ExceptionRecord  = NULL;
1090     stack->rec.ExceptionCode    = exception_code;
1091     stack->rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
1092     stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
1093     stack->rec.NumberParameters = 0;
1094
1095     save_context( &stack->context, sigcontext, fs, gs );
1096
1097     /* now modify the sigcontext to return to the raise function */
1098     ESP_sig(sigcontext) = (DWORD)stack;
1099     EIP_sig(sigcontext) = (DWORD)func;
1100     /* clear single-step, direction, and align check flag */
1101     EFL_sig(sigcontext) &= ~(0x100|0x400|0x40000);
1102     CS_sig(sigcontext)  = wine_get_cs();
1103     DS_sig(sigcontext)  = wine_get_ds();
1104     ES_sig(sigcontext)  = wine_get_es();
1105     FS_sig(sigcontext)  = wine_get_fs();
1106     GS_sig(sigcontext)  = wine_get_gs();
1107     SS_sig(sigcontext)  = wine_get_ss();
1108
1109     return stack->rec_ptr;
1110 }
1111
1112
1113 /***********************************************************************
1114  *           setup_exception
1115  *
1116  * Setup a proper stack frame for the raise function, and modify the
1117  * sigcontext so that the return from the signal handler will call
1118  * the raise function.
1119  */
1120 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
1121 {
1122     WORD fs, gs;
1123     void *stack = init_handler( sigcontext, &fs, &gs );
1124
1125     return setup_exception_record( sigcontext, stack, fs, gs, func );
1126 }
1127
1128
1129 /***********************************************************************
1130  *           get_exception_context
1131  *
1132  * Get a pointer to the context built by setup_exception.
1133  */
1134 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
1135 {
1136     return (CONTEXT *)rec - 1;  /* cf. stack_layout structure */
1137 }
1138
1139
1140 /**********************************************************************
1141  *              get_fpu_code
1142  *
1143  * Get the FPU exception code from the FPU status.
1144  */
1145 static inline DWORD get_fpu_code( const CONTEXT *context )
1146 {
1147     DWORD status = context->FloatSave.StatusWord;
1148
1149     if (status & 0x01)  /* IE */
1150     {
1151         if (status & 0x40)  /* SF */
1152             return EXCEPTION_FLT_STACK_CHECK;
1153         else
1154             return EXCEPTION_FLT_INVALID_OPERATION;
1155     }
1156     if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND;  /* DE flag */
1157     if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO;    /* ZE flag */
1158     if (status & 0x08) return EXCEPTION_FLT_OVERFLOW;          /* OE flag */
1159     if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW;         /* UE flag */
1160     if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT;    /* PE flag */
1161     return EXCEPTION_FLT_INVALID_OPERATION;  /* generic error */
1162 }
1163
1164
1165 /**********************************************************************
1166  *              raise_segv_exception
1167  */
1168 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1169 {
1170     switch(rec->ExceptionCode)
1171     {
1172     case EXCEPTION_ACCESS_VIOLATION:
1173         if (rec->NumberParameters == 2)
1174         {
1175             if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT && check_atl_thunk( rec, context ))
1176                 goto done;
1177             rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] );
1178         }
1179         break;
1180     case EXCEPTION_DATATYPE_MISALIGNMENT:
1181         /* FIXME: pass through exception handler first? */
1182         if (context->EFlags & 0x00040000)
1183         {
1184             /* Disable AC flag, return */
1185             context->EFlags &= ~0x00040000;
1186             goto done;
1187         }
1188         break;
1189     }
1190     __regs_RtlRaiseException( rec, context );
1191 done:
1192     NtSetContextThread( GetCurrentThread(), context );
1193 }
1194
1195
1196 /**********************************************************************
1197  *              raise_trap_exception
1198  */
1199 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1200 {
1201     if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
1202     {
1203         struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
1204
1205         /* when single stepping can't tell whether this is a hw bp or a
1206          * single step interrupt. try to avoid as much overhead as possible
1207          * and only do a server call if there is any hw bp enabled. */
1208
1209         if( !(context->EFlags & 0x100) || (regs->dr7 & 0xff) )
1210         {
1211             /* (possible) hardware breakpoint, fetch the debug registers */
1212             context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
1213             NtGetContextThread(GetCurrentThread(), context);
1214             context->ContextFlags |= CONTEXT_FULL;  /* restore flags */
1215         }
1216
1217         context->EFlags &= ~0x100;  /* clear single-step flag */
1218     }
1219
1220     __regs_RtlRaiseException( rec, context );
1221     NtSetContextThread( GetCurrentThread(), context );
1222 }
1223
1224
1225 /**********************************************************************
1226  *              raise_exception
1227  *
1228  * Generic raise function for exceptions that don't need special treatment.
1229  */
1230 static void WINAPI raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1231 {
1232     __regs_RtlRaiseException( rec, context );
1233     NtSetContextThread( GetCurrentThread(), context );
1234 }
1235
1236
1237 #ifdef __HAVE_VM86
1238 /**********************************************************************
1239  *              raise_vm86_sti_exception
1240  */
1241 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1242 {
1243     /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
1244     get_vm86_teb_info()->vm86_pending |= VIP_FLAG;
1245
1246     if (ntdll_get_thread_data()->vm86_ptr)
1247     {
1248         if (((char*)context->Eip >= (char*)vm86_return) &&
1249             ((char*)context->Eip <= (char*)vm86_return_end) &&
1250             (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
1251             /* exiting from VM86, can't throw */
1252             goto done;
1253         }
1254         merge_vm86_pending_flags( rec );
1255     }
1256     else if (get_vm86_teb_info()->dpmi_vif &&
1257              !wine_ldt_is_system(context->SegCs) &&
1258              !wine_ldt_is_system(context->SegSs))
1259     {
1260         /* Executing DPMI code and virtual interrupts are enabled. */
1261         get_vm86_teb_info()->vm86_pending = 0;
1262         __regs_RtlRaiseException( rec, context );
1263     }
1264 done:
1265     NtSetContextThread( GetCurrentThread(), context );
1266 }
1267
1268
1269 /**********************************************************************
1270  *              usr2_handler
1271  *
1272  * Handler for SIGUSR2.
1273  * We use it to signal that the running __wine_enter_vm86() should
1274  * immediately set VIP_FLAG, causing pending events to be handled
1275  * as early as possible.
1276  */
1277 static void usr2_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1278 {
1279     EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_vm86_sti_exception );
1280     rec->ExceptionCode = EXCEPTION_VM86_STI;
1281 }
1282 #endif /* __HAVE_VM86 */
1283
1284
1285 /**********************************************************************
1286  *              segv_handler
1287  *
1288  * Handler for SIGSEGV and related errors.
1289  */
1290 static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1291 {
1292     WORD fs, gs;
1293     EXCEPTION_RECORD *rec;
1294     SIGCONTEXT *context = sigcontext;
1295     void *stack = init_handler( sigcontext, &fs, &gs );
1296
1297     /* check for page fault inside the thread stack */
1298     if (get_trap_code(context) == TRAP_x86_PAGEFLT &&
1299         (char *)siginfo->si_addr >= (char *)NtCurrentTeb()->DeallocationStack &&
1300         (char *)siginfo->si_addr < (char *)NtCurrentTeb()->Tib.StackBase &&
1301         virtual_handle_stack_fault( siginfo->si_addr ))
1302     {
1303         /* check if this was the last guard page */
1304         if ((char *)siginfo->si_addr < (char *)NtCurrentTeb()->DeallocationStack + 2*4096)
1305         {
1306             rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1307             rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1308         }
1309         return;
1310     }
1311
1312     rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1313     if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return;
1314
1315     switch(get_trap_code(context))
1316     {
1317     case TRAP_x86_OFLOW:   /* Overflow exception */
1318         rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
1319         break;
1320     case TRAP_x86_BOUND:   /* Bound range exception */
1321         rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
1322         break;
1323     case TRAP_x86_PRIVINFLT:   /* Invalid opcode exception */
1324         rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1325         break;
1326     case TRAP_x86_STKFLT:  /* Stack fault */
1327         rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1328         break;
1329     case TRAP_x86_SEGNPFLT:  /* Segment not present exception */
1330     case TRAP_x86_PROTFLT:   /* General protection fault */
1331     case TRAP_x86_UNKNOWN:   /* Unknown fault code */
1332         {
1333             WORD err = get_error_code(context);
1334             if (!err && (rec->ExceptionCode = is_privileged_instr( get_exception_context(rec) ))) break;
1335             rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1336             rec->NumberParameters = 2;
1337             rec->ExceptionInformation[0] = 0;
1338             /* if error contains a LDT selector, use that as fault address */
1339             if ((err & 7) == 4 && !wine_ldt_is_system( err | 7 ))
1340                 rec->ExceptionInformation[1] = err & ~7;
1341             else
1342                 rec->ExceptionInformation[1] = 0xffffffff;
1343         }
1344         break;
1345     case TRAP_x86_PAGEFLT:  /* Page fault */
1346         rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1347         rec->NumberParameters = 2;
1348         rec->ExceptionInformation[0] = (get_error_code(context) >> 1) & 0x09;
1349         rec->ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
1350         break;
1351     case TRAP_x86_ALIGNFLT:  /* Alignment check exception */
1352         rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
1353         break;
1354     default:
1355         WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1356         /* fall through */
1357     case TRAP_x86_NMI:       /* NMI interrupt */
1358     case TRAP_x86_DNA:       /* Device not available exception */
1359     case TRAP_x86_DOUBLEFLT: /* Double fault exception */
1360     case TRAP_x86_TSSFLT:    /* Invalid TSS exception */
1361     case TRAP_x86_MCHK:      /* Machine check exception */
1362     case TRAP_x86_CACHEFLT:  /* Cache flush exception */
1363         rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1364         break;
1365     }
1366 }
1367
1368
1369 /**********************************************************************
1370  *              trap_handler
1371  *
1372  * Handler for SIGTRAP.
1373  */
1374 static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1375 {
1376     SIGCONTEXT *context = sigcontext;
1377     EXCEPTION_RECORD *rec = setup_exception( context, raise_trap_exception );
1378
1379     switch(get_trap_code(context))
1380     {
1381     case TRAP_x86_TRCTRAP:  /* Single-step exception */
1382         rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1383         break;
1384     case TRAP_x86_BPTFLT:   /* Breakpoint exception */
1385         rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1;  /* back up over the int3 instruction */
1386         /* fall through */
1387     default:
1388         rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1389         break;
1390     }
1391 }
1392
1393
1394 /**********************************************************************
1395  *              fpe_handler
1396  *
1397  * Handler for SIGFPE.
1398  */
1399 static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1400 {
1401     CONTEXT *win_context;
1402     SIGCONTEXT *context = sigcontext;
1403     EXCEPTION_RECORD *rec = setup_exception( context, raise_exception );
1404
1405     win_context = get_exception_context( rec );
1406
1407     switch(get_trap_code(context))
1408     {
1409     case TRAP_x86_DIVIDE:   /* Division by zero exception */
1410         rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1411         break;
1412     case TRAP_x86_FPOPFLT:   /* Coprocessor segment overrun */
1413         rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1414         break;
1415     case TRAP_x86_ARITHTRAP:  /* Floating point exception */
1416     case TRAP_x86_UNKNOWN:    /* Unknown fault code */
1417         rec->ExceptionCode = get_fpu_code( win_context );
1418         break;
1419     case TRAP_x86_CACHEFLT:  /* SIMD exception */
1420         /* TODO:
1421          * Behaviour only tested for divide-by-zero exceptions
1422          * Check for other SIMD exceptions as well */
1423         if(siginfo->si_code != FPE_FLTDIV)
1424             FIXME("untested SIMD exception: %#x. Might not work correctly\n",
1425                   siginfo->si_code);
1426
1427         rec->ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS;
1428         rec->NumberParameters = 1;
1429         /* no idea what meaning is actually behind this but that's what native does */
1430         rec->ExceptionInformation[0] = 0;
1431         break;
1432     default:
1433         WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1434         rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1435         break;
1436     }
1437 }
1438
1439
1440 /**********************************************************************
1441  *              int_handler
1442  *
1443  * Handler for SIGINT.
1444  *
1445  * FIXME: should not be calling external functions on the signal stack.
1446  */
1447 static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1448 {
1449     WORD fs, gs;
1450     init_handler( sigcontext, &fs, &gs );
1451     if (!dispatch_signal(SIGINT))
1452     {
1453         EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1454         rec->ExceptionCode = CONTROL_C_EXIT;
1455     }
1456 }
1457
1458 /**********************************************************************
1459  *              abrt_handler
1460  *
1461  * Handler for SIGABRT.
1462  */
1463 static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1464 {
1465     EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1466     rec->ExceptionCode  = EXCEPTION_WINE_ASSERTION;
1467     rec->ExceptionFlags = EH_NONCONTINUABLE;
1468 }
1469
1470
1471 /**********************************************************************
1472  *              quit_handler
1473  *
1474  * Handler for SIGQUIT.
1475  */
1476 static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1477 {
1478     WORD fs, gs;
1479     init_handler( sigcontext, &fs, &gs );
1480     server_abort_thread(0);
1481 }
1482
1483
1484 /**********************************************************************
1485  *              usr1_handler
1486  *
1487  * Handler for SIGUSR1, used to signal a thread that it got suspended.
1488  */
1489 static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1490 {
1491     CONTEXT context;
1492     WORD fs, gs;
1493
1494     init_handler( sigcontext, &fs, &gs );
1495     save_context( &context, sigcontext, fs, gs );
1496     wait_suspend( &context );
1497     restore_context( &context, sigcontext );
1498 }
1499
1500
1501 /**********************************************************************
1502  *              get_signal_stack_total_size
1503  *
1504  * Retrieve the size to allocate for the signal stack, including the TEB at the bottom.
1505  * Must be a power of two.
1506  */
1507 size_t get_signal_stack_total_size(void)
1508 {
1509     static const size_t teb_size = 4096;  /* we reserve one page for the TEB */
1510
1511     if (!signal_stack_size)
1512     {
1513         size_t size = 8192, min_size = teb_size + max( MINSIGSTKSZ, 8192 );
1514         /* find the first power of two not smaller than min_size */
1515         while (size < min_size) size *= 2;
1516         signal_stack_mask = size - 1;
1517         signal_stack_size = size - teb_size;
1518     }
1519     return signal_stack_size + teb_size;
1520 }
1521
1522
1523 /***********************************************************************
1524  *           __wine_set_signal_handler   (NTDLL.@)
1525  */
1526 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1527 {
1528     if (sig >= sizeof(handlers) / sizeof(handlers[0])) return -1;
1529     if (handlers[sig] != NULL) return -2;
1530     handlers[sig] = wsh;
1531     return 0;
1532 }
1533
1534
1535 /**********************************************************************
1536  *              SIGNAL_Init
1537  */
1538 BOOL SIGNAL_Init(void)
1539 {
1540     struct sigaction sig_act;
1541
1542 #ifdef HAVE_SIGALTSTACK
1543     stack_t ss;
1544
1545 #ifdef __APPLE__
1546     int mib[2], val = 1;
1547
1548     mib[0] = CTL_KERN;
1549     mib[1] = KERN_THALTSTACK;
1550     sysctl( mib, 2, NULL, NULL, &val, sizeof(val) );
1551 #endif
1552
1553     ss.ss_sp    = get_signal_stack();
1554     ss.ss_size  = signal_stack_size;
1555     ss.ss_flags = 0;
1556     if (sigaltstack(&ss, NULL) == -1)
1557     {
1558         perror( "sigaltstack" );
1559         return FALSE;
1560     }
1561 #endif  /* HAVE_SIGALTSTACK */
1562
1563     sig_act.sa_mask = server_block_set;
1564     sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1565 #ifdef SA_ONSTACK
1566     sig_act.sa_flags |= SA_ONSTACK;
1567 #endif
1568
1569     sig_act.sa_sigaction = int_handler;
1570     if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
1571     sig_act.sa_sigaction = fpe_handler;
1572     if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
1573     sig_act.sa_sigaction = abrt_handler;
1574     if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
1575     sig_act.sa_sigaction = quit_handler;
1576     if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
1577     sig_act.sa_sigaction = usr1_handler;
1578     if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
1579
1580     sig_act.sa_sigaction = segv_handler;
1581     if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
1582     if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
1583 #ifdef SIGBUS
1584     if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
1585 #endif
1586
1587 #ifdef SIGTRAP
1588     sig_act.sa_sigaction = trap_handler;
1589     if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
1590 #endif
1591
1592 #ifdef __HAVE_VM86
1593     sig_act.sa_sigaction = usr2_handler;
1594     if (sigaction( SIGUSR2, &sig_act, NULL ) == -1) goto error;
1595 #endif
1596
1597     return TRUE;
1598
1599  error:
1600     perror("sigaction");
1601     return FALSE;
1602 }
1603
1604
1605 #ifdef __HAVE_VM86
1606 /**********************************************************************
1607  *              __wine_enter_vm86   (NTDLL.@)
1608  *
1609  * Enter vm86 mode with the specified register context.
1610  */
1611 void __wine_enter_vm86( CONTEXT *context )
1612 {
1613     EXCEPTION_RECORD rec;
1614     int res;
1615     struct vm86plus_struct vm86;
1616
1617     memset( &vm86, 0, sizeof(vm86) );
1618     for (;;)
1619     {
1620         restore_vm86_context( context, &vm86 );
1621
1622         ntdll_get_thread_data()->vm86_ptr = &vm86;
1623         merge_vm86_pending_flags( &rec );
1624
1625         res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1626         if (res < 0)
1627         {
1628             errno = -res;
1629             return;
1630         }
1631
1632         save_vm86_context( context, &vm86 );
1633
1634         rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
1635         rec.ExceptionRecord  = NULL;
1636         rec.ExceptionAddress = (LPVOID)context->Eip;
1637         rec.NumberParameters = 0;
1638
1639         switch(VM86_TYPE(res))
1640         {
1641         case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1642             rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1643             break;
1644         case VM86_TRAP: /* return due to DOS-debugger request */
1645             switch(VM86_ARG(res))
1646             {
1647             case TRAP_x86_TRCTRAP:  /* Single-step exception */
1648                 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
1649                 break;
1650             case TRAP_x86_BPTFLT:   /* Breakpoint exception */
1651                 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1;  /* back up over the int3 instruction */
1652                 /* fall through */
1653             default:
1654                 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
1655                 break;
1656             }
1657             break;
1658         case VM86_INTx: /* int3/int x instruction (ARG = x) */
1659             rec.ExceptionCode = EXCEPTION_VM86_INTx;
1660             rec.NumberParameters = 1;
1661             rec.ExceptionInformation[0] = VM86_ARG(res);
1662             break;
1663         case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1664             context->EFlags |= VIF_FLAG;
1665             context->EFlags &= ~VIP_FLAG;
1666             get_vm86_teb_info()->vm86_pending = 0;
1667             rec.ExceptionCode = EXCEPTION_VM86_STI;
1668             break;
1669         case VM86_PICRETURN: /* return due to pending PIC request */
1670             rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1671             break;
1672         case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
1673         default:
1674             WINE_ERR( "unhandled result from vm86 mode %x\n", res );
1675             continue;
1676         }
1677         __regs_RtlRaiseException( &rec, context );
1678     }
1679 }
1680
1681 #else /* __HAVE_VM86 */
1682 /**********************************************************************
1683  *              __wine_enter_vm86   (NTDLL.@)
1684  */
1685 void __wine_enter_vm86( CONTEXT *context )
1686 {
1687     MESSAGE("vm86 mode not supported on this platform\n");
1688 }
1689 #endif /* __HAVE_VM86 */
1690
1691 /**********************************************************************
1692  *              DbgBreakPoint   (NTDLL.@)
1693  */
1694 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret")
1695
1696 /**********************************************************************
1697  *              DbgUserBreakPoint   (NTDLL.@)
1698  */
1699 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret")
1700
1701
1702 /**********************************************************************
1703  *              EXC_CallHandler   (internal)
1704  *
1705  * Some exception handlers depend on EBP to have a fixed position relative to
1706  * the exception frame.
1707  * Shrinker depends on (*1) doing what it does,
1708  * (*2) being the exact instruction it is and (*3) beginning with 0x64
1709  * (i.e. the %fs prefix to the movl instruction). It also depends on the
1710  * function calling the handler having only 5 parameters (*4).
1711  */
1712 __ASM_GLOBAL_FUNC( EXC_CallHandler,
1713 "       pushl   %ebp\n"
1714 "       movl    %esp, %ebp\n"
1715 "       pushl   %ebx\n"
1716 "       movl    28(%ebp), %edx\n" /* ugly hack to pass the 6th param needed because of Shrinker */
1717 "       pushl   24(%ebp)\n"
1718 "       pushl   20(%ebp)\n"
1719 "       pushl   16(%ebp)\n"
1720 "       pushl   12(%ebp)\n"
1721 "       pushl   8(%ebp)\n"
1722 "       call    " __ASM_NAME("call_exception_handler") "\n"
1723 "       popl    %ebx\n"
1724 "       leave\n"
1725 "       ret\n"
1726 )
1727 __ASM_GLOBAL_FUNC(call_exception_handler,
1728 "       pushl   %ebp\n"
1729 "       movl    %esp, %ebp\n"
1730 "       subl    $12,%esp\n"
1731 "       pushl   12(%ebp)\n"       /* make any exceptions in this... */
1732 "       pushl   %edx\n"           /* handler be handled by... */
1733 "       .byte   0x64\n"
1734 "       pushl   (0)\n"            /* nested_handler (passed in edx). */
1735 "       .byte   0x64\n"
1736 "       movl    %esp,(0)\n"       /* push the new exception frame onto the exception stack. */
1737 "       pushl   20(%ebp)\n"
1738 "       pushl   16(%ebp)\n"
1739 "       pushl   12(%ebp)\n"
1740 "       pushl   8(%ebp)\n"
1741 "       movl    24(%ebp), %ecx\n" /* (*1) */
1742 "       call    *%ecx\n"          /* call handler. (*2) */
1743 "       .byte   0x64\n"
1744 "       movl    (0), %esp\n"      /* restore previous... (*3) */
1745 "       .byte   0x64\n"
1746 "       popl    (0)\n"            /* exception frame. */
1747 "       movl    %ebp, %esp\n"     /* restore saved stack, in case it was corrupted */
1748 "       popl    %ebp\n"
1749 "       ret     $20\n"            /* (*4) */
1750 )
1751 #endif  /* __i386__ */