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  * Return the stack pointer to use for pushing the exception data.
 586  */
 587 static inline void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
 588 {
 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     wine_set_gs( thread_data->gs );
 606
 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         return teb->WOW32Reserved;
 618     }
 619     return (void *)(ESP_sig(sigcontext) & ~3);
 620 }
 621
 622
 623 /***********************************************************************
 624  *           save_fpu
 625  *
 626  * Save the thread FPU context.
 627  */
 628 static inline void save_fpu( CONTEXT *context )
 629 {
 630 #ifdef __GNUC__
 631     context->ContextFlags |= CONTEXT_FLOATING_POINT;
 632     __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
 633 #endif
 634 }
 635
 636
 637 /***********************************************************************
 638  *           save_fpux
 639  *
 640  * Save the thread FPU extended context.
 641  */
 642 static inline void save_fpux( CONTEXT *context )
 643 {
 644 #ifdef __GNUC__
 645     /* we have to enforce alignment by hand */
 646     char buffer[sizeof(XMM_SAVE_AREA32) + 16];
 647     XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
 648
 649     __asm__ __volatile__( "fxsave %0" : "=m" (*state) );
 650     context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
 651     memcpy( context->ExtendedRegisters, state, sizeof(*state) );
 652 #endif
 653 }
 654
 655
 656 /***********************************************************************
 657  *           restore_fpu
 658  *
 659  * Restore the FPU context to a sigcontext.
 660  */
 661 static inline void restore_fpu( const CONTEXT *context )
 662 {
 663     FLOATING_SAVE_AREA float_status = context->FloatSave;
 664     /* reset the current interrupt status */
 665     float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
 666 #ifdef __GNUC__
 667     __asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
 668 #endif  /* __GNUC__ */
 669 }
 670
 671
 672 /***********************************************************************
 673  *           restore_fpux
 674  *
 675  * Restore the FPU extended context to a sigcontext.
 676  */
 677 static inline void restore_fpux( const CONTEXT *context )
 678 {
 679 #ifdef __GNUC__
 680     /* we have to enforce alignment by hand */
 681     char buffer[sizeof(XMM_SAVE_AREA32) + 16];
 682     XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
 683
 684     memcpy( state, context->ExtendedRegisters, sizeof(*state) );
 685     /* reset the current interrupt status */
 686     state->StatusWord &= state->ControlWord | 0xff80;
 687     __asm__ __volatile__( "fxrstor %0" : : "m" (*state) );
 688 #endif
 689 }
 690
 691
 692 /***********************************************************************
 693  *           fpux_to_fpu
 694  *
 695  * Build a standard FPU context from an extended one.
 696  */
 697 static void fpux_to_fpu( FLOATING_SAVE_AREA *fpu, const XMM_SAVE_AREA32 *fpux )
 698 {
 699     unsigned int i, tag, stack_top;
 700
 701     fpu->ControlWord   = fpux->ControlWord | 0xffff0000;
 702     fpu->StatusWord    = fpux->StatusWord | 0xffff0000;
 703     fpu->ErrorOffset   = fpux->ErrorOffset;
 704     fpu->ErrorSelector = fpux->ErrorSelector | (fpux->ErrorOpcode << 16);
 705     fpu->DataOffset    = fpux->DataOffset;
 706     fpu->DataSelector  = fpux->DataSelector;
 707     fpu->Cr0NpxState   = fpux->StatusWord | 0xffff0000;
 708
 709     stack_top = (fpux->StatusWord >> 11) & 7;
 710     fpu->TagWord = 0xffff0000;
 711     for (i = 0; i < 8; i++)
 712     {
 713         memcpy( &fpu->RegisterArea[10 * i], &fpux->FloatRegisters[i], 10 );
 714         if (!(fpux->TagWord & (1 << i))) tag = 3;  /* empty */
 715         else
 716         {
 717             const M128A *reg = &fpux->FloatRegisters[(i - stack_top) & 7];
 718             if ((reg->High & 0x7fff) == 0x7fff)  /* exponent all ones */
 719             {
 720                 tag = 2;  /* special */
 721             }
 722             else if (!(reg->High & 0x7fff))  /* exponent all zeroes */
 723             {
 724                 if (reg->Low) tag = 2;  /* special */
 725                 else tag = 1;  /* zero */
 726             }
 727             else
 728             {
 729                 if (reg->Low >> 63) tag = 0;  /* valid */
 730                 else tag = 2;  /* special */
 731             }
 732         }
 733         fpu->TagWord |= tag << (2 * i);
 734     }
 735 }
 736
 737
 738 /***********************************************************************
 739  *           save_context
 740  *
 741  * Build a context structure from the signal info.
 742  */
 743 static inline void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
 744 {
 745     struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
 746     FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
 747     XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
 748
 749     memset(context, 0, sizeof(*context));
 750     context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
 751     context->Eax          = EAX_sig(sigcontext);
 752     context->Ebx          = EBX_sig(sigcontext);
 753     context->Ecx          = ECX_sig(sigcontext);
 754     context->Edx          = EDX_sig(sigcontext);
 755     context->Esi          = ESI_sig(sigcontext);
 756     context->Edi          = EDI_sig(sigcontext);
 757     context->Ebp          = EBP_sig(sigcontext);
 758     context->EFlags       = EFL_sig(sigcontext);
 759     context->Eip          = EIP_sig(sigcontext);
 760     context->Esp          = ESP_sig(sigcontext);
 761     context->SegCs        = LOWORD(CS_sig(sigcontext));
 762     context->SegDs        = LOWORD(DS_sig(sigcontext));
 763     context->SegEs        = LOWORD(ES_sig(sigcontext));
 764     context->SegFs        = fs;
 765     context->SegGs        = gs;
 766     context->SegSs        = LOWORD(SS_sig(sigcontext));
 767     context->Dr0          = regs->dr0;
 768     context->Dr1          = regs->dr1;
 769     context->Dr2          = regs->dr2;
 770     context->Dr3          = regs->dr3;
 771     context->Dr6          = regs->dr6;
 772     context->Dr7          = regs->dr7;
 773
 774     if (fpu)
 775     {
 776         context->ContextFlags |= CONTEXT_FLOATING_POINT;
 777         context->FloatSave = *fpu;
 778     }
 779     if (fpux)
 780     {
 781         context->ContextFlags |= CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
 782         memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) );
 783         fpux_support = 1;
 784         if (!fpu) fpux_to_fpu( &context->FloatSave, fpux );
 785     }
 786     if (!fpu && !fpux) save_fpu( context );
 787 }
 788
 789
 790 /***********************************************************************
 791  *           restore_context
 792  *
 793  * Restore the signal info from the context.
 794  */
 795 static inline void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
 796 {
 797     struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
 798     FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
 799     XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
 800
 801     regs->dr0 = context->Dr0;
 802     regs->dr1 = context->Dr1;
 803     regs->dr2 = context->Dr2;
 804     regs->dr3 = context->Dr3;
 805     regs->dr6 = context->Dr6;
 806     regs->dr7 = context->Dr7;
 807     EAX_sig(sigcontext) = context->Eax;
 808     EBX_sig(sigcontext) = context->Ebx;
 809     ECX_sig(sigcontext) = context->Ecx;
 810     EDX_sig(sigcontext) = context->Edx;
 811     ESI_sig(sigcontext) = context->Esi;
 812     EDI_sig(sigcontext) = context->Edi;
 813     EBP_sig(sigcontext) = context->Ebp;
 814     EFL_sig(sigcontext) = context->EFlags;
 815     EIP_sig(sigcontext) = context->Eip;
 816     ESP_sig(sigcontext) = context->Esp;
 817     CS_sig(sigcontext)  = context->SegCs;
 818     DS_sig(sigcontext)  = context->SegDs;
 819     ES_sig(sigcontext)  = context->SegEs;
 820     SS_sig(sigcontext)  = context->SegSs;
 821 #ifdef GS_sig
 822     GS_sig(sigcontext)  = context->SegGs;
 823 #else
 824     wine_set_gs( context->SegGs );
 825 #endif
 826 #ifdef FS_sig
 827     FS_sig(sigcontext)  = context->SegFs;
 828 #else
 829     wine_set_fs( context->SegFs );
 830 #endif
 831
 832     if (fpu) *fpu = context->FloatSave;
 833     if (fpux) memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) );
 834     if (!fpu && !fpux) restore_fpu( context );
 835 }
 836
 837
 838 /***********************************************************************
 839  *              get_cpu_context
 840  *
 841  * Register function to get the context of the current thread.
 842  */
 843 void WINAPI __regs_get_cpu_context( CONTEXT *context, CONTEXT *regs )
 844 {
 845     *context = *regs;
 846     if (fpux_support) save_fpux( context );
 847     else save_fpu( context );
 848 }
 849 DEFINE_REGS_ENTRYPOINT( get_cpu_context, 4, 4 )
 850
 851
 852 /***********************************************************************
 853  *           set_cpu_context
 854  *
 855  * Set the new CPU context. Used by NtSetContextThread.
 856  */
 857 void set_cpu_context( const CONTEXT *context )
 858 {
 859     DWORD flags = context->ContextFlags & ~CONTEXT_i386;
 860
 861     if ((flags & CONTEXT_EXTENDED_REGISTERS) && fpux_support) restore_fpux( context );
 862     else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
 863
 864     if (flags & CONTEXT_DEBUG_REGISTERS)
 865     {
 866         struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
 867         regs->dr0 = context->Dr0;
 868         regs->dr1 = context->Dr1;
 869         regs->dr2 = context->Dr2;
 870         regs->dr3 = context->Dr3;
 871         regs->dr6 = context->Dr6;
 872         regs->dr7 = context->Dr7;
 873     }
 874     if (flags & CONTEXT_FULL)
 875     {
 876         if (!(flags & CONTEXT_CONTROL))
 877             FIXME( "setting partial context (%x) not supported\n", flags );
 878         else if (flags & CONTEXT_SEGMENTS)
 879             __wine_call_from_32_restore_regs( context );
 880         else
 881         {
 882             CONTEXT newcontext = *context;
 883             newcontext.SegDs = wine_get_ds();
 884             newcontext.SegEs = wine_get_es();
 885             newcontext.SegFs = wine_get_fs();
 886             newcontext.SegGs = wine_get_gs();
 887             __wine_call_from_32_restore_regs( &newcontext );
 888         }
 889     }
 890 }
 891
 892
 893 /***********************************************************************
 894  *           is_privileged_instr
 895  *
 896  * Check if the fault location is a privileged instruction.
 897  * Based on the instruction emulation code in dlls/kernel/instr.c.
 898  */
 899 static inline DWORD is_privileged_instr( CONTEXT86 *context )
 900 {
 901     const BYTE *instr;
 902     unsigned int prefix_count = 0;
 903
 904     if (!wine_ldt_is_system( context->SegCs )) return 0;
 905     instr = (BYTE *)context->Eip;
 906
 907     for (;;) switch(*instr)
 908     {
 909     /* instruction prefixes */
 910     case 0x2e:  /* %cs: */
 911     case 0x36:  /* %ss: */
 912     case 0x3e:  /* %ds: */
 913     case 0x26:  /* %es: */
 914     case 0x64:  /* %fs: */
 915     case 0x65:  /* %gs: */
 916     case 0x66:  /* opcode size */
 917     case 0x67:  /* addr size */
 918     case 0xf0:  /* lock */
 919     case 0xf2:  /* repne */
 920     case 0xf3:  /* repe */
 921         if (++prefix_count >= 15) return EXCEPTION_ILLEGAL_INSTRUCTION;
 922         instr++;
 923         continue;
 924
 925     case 0x0f: /* extended instruction */
 926         switch(instr[1])
 927         {
 928         case 0x20: /* mov crX, reg */
 929         case 0x21: /* mov drX, reg */
 930         case 0x22: /* mov reg, crX */
 931         case 0x23: /* mov reg drX */
 932             return EXCEPTION_PRIV_INSTRUCTION;
 933         }
 934         return 0;
 935     case 0x6c: /* insb (%dx) */
 936     case 0x6d: /* insl (%dx) */
 937     case 0x6e: /* outsb (%dx) */
 938     case 0x6f: /* outsl (%dx) */
 939     case 0xcd: /* int $xx */
 940     case 0xe4: /* inb al,XX */
 941     case 0xe5: /* in (e)ax,XX */
 942     case 0xe6: /* outb XX,al */
 943     case 0xe7: /* out XX,(e)ax */
 944     case 0xec: /* inb (%dx),%al */
 945     case 0xed: /* inl (%dx),%eax */
 946     case 0xee: /* outb %al,(%dx) */
 947     case 0xef: /* outl %eax,(%dx) */
 948     case 0xf4: /* hlt */
 949     case 0xfa: /* cli */
 950     case 0xfb: /* sti */
 951         return EXCEPTION_PRIV_INSTRUCTION;
 952     default:
 953         return 0;
 954     }
 955 }
 956
 957
 958 #include "pshpack1.h"
 959 struct atl_thunk
 960 {
 961     DWORD movl;  /* movl this,4(%esp) */
 962     DWORD this;
 963     BYTE  jmp;   /* jmp func */
 964     int   func;
 965 };
 966 #include "poppack.h"
 967
 968 /**********************************************************************
 969  *              check_atl_thunk
 970  *
 971  * Check if code destination is an ATL thunk, and emulate it if so.
 972  */
 973 static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context )
 974 {
 975     const struct atl_thunk *thunk = (const struct atl_thunk *)rec->ExceptionInformation[1];
 976     BOOL ret = FALSE;
 977
 978     __TRY
 979     {
 980         if (thunk->movl == 0x042444c7 && thunk->jmp == 0xe9)
 981         {
 982             *((DWORD *)context->Esp + 1) = thunk->this;
 983             context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func;
 984             TRACE( "emulating ATL thunk at %p, func=%08x arg=%08x\n",
 985                    thunk, context->Eip, *((DWORD *)context->Esp + 1) );
 986             ret = TRUE;
 987         }
 988     }
 989     __EXCEPT_PAGE_FAULT
 990     {
 991         return FALSE;
 992     }
 993     __ENDTRY
 994     return ret;
 995 }
 996
 997
 998 /***********************************************************************
 999  *           setup_exception_record
1000  *
1001  * Setup the exception record and context on the thread stack.
1002  */
1003 static EXCEPTION_RECORD *setup_exception_record( SIGCONTEXT *sigcontext, void *stack_ptr,
1004                                                  WORD fs, WORD gs, raise_func func )
1005 {
1006     struct stack_layout
1007     {
1008         void             *ret_addr;      /* return address from raise_func */
1009         EXCEPTION_RECORD *rec_ptr;       /* first arg for raise_func */
1010         CONTEXT          *context_ptr;   /* second arg for raise_func */
1011         CONTEXT           context;
1012         EXCEPTION_RECORD  rec;
1013         DWORD             ebp;
1014         DWORD             eip;
1015     } *stack = stack_ptr;
1016     DWORD exception_code = 0;
1017
1018     /* stack sanity checks */
1019
1020     if ((char *)stack >= (char *)get_signal_stack() &&
1021         (char *)stack < (char *)get_signal_stack() + signal_stack_size)
1022     {
1023         WINE_ERR( "nested exception on signal stack in thread %04x eip %08x esp %08x stack %p-%p\n",
1024                   GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1025                   (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1026                   NtCurrentTeb()->Tib.StackBase );
1027         server_abort_thread(1);
1028     }
1029
1030     if (stack - 1 > stack || /* check for overflow in subtraction */
1031         (char *)stack <= (char *)NtCurrentTeb()->DeallocationStack ||
1032         (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
1033     {
1034         WARN( "exception outside of stack limits in thread %04x eip %08x esp %08x stack %p-%p\n",
1035               GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1036               (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1037               NtCurrentTeb()->Tib.StackBase );
1038     }
1039     else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->DeallocationStack + 4096)
1040     {
1041         /* stack overflow on last page, unrecoverable */
1042         UINT diff = (char *)NtCurrentTeb()->DeallocationStack + 4096 - (char *)(stack - 1);
1043         WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1044                   diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1045                   (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1046                   NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1047         server_abort_thread(1);
1048     }
1049     else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit)
1050     {
1051         /* stack access below stack limit, may be recoverable */
1052         if (virtual_handle_stack_fault( stack - 1 )) exception_code = EXCEPTION_STACK_OVERFLOW;
1053         else
1054         {
1055             UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)(stack - 1);
1056             WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1057                       diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1058                       (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1059                       NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1060             server_abort_thread(1);
1061         }
1062     }
1063
1064     stack--;  /* push the stack_layout structure */
1065 #if defined(VALGRIND_MAKE_MEM_UNDEFINED)
1066     VALGRIND_MAKE_MEM_UNDEFINED(stack, sizeof(*stack));
1067 #elif defined(VALGRIND_MAKE_WRITABLE)
1068     VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack));
1069 #endif
1070     stack->ret_addr     = (void *)0xdeadbabe;  /* raise_func must not return */
1071     stack->rec_ptr      = &stack->rec;
1072     stack->context_ptr  = &stack->context;
1073
1074     stack->rec.ExceptionRecord  = NULL;
1075     stack->rec.ExceptionCode    = exception_code;
1076     stack->rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
1077     stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
1078     stack->rec.NumberParameters = 0;
1079
1080     save_context( &stack->context, sigcontext, fs, gs );
1081
1082     /* now modify the sigcontext to return to the raise function */
1083     ESP_sig(sigcontext) = (DWORD)stack;
1084     EIP_sig(sigcontext) = (DWORD)func;
1085     /* clear single-step, direction, and align check flag */
1086     EFL_sig(sigcontext) &= ~(0x100|0x400|0x40000);
1087     CS_sig(sigcontext)  = wine_get_cs();
1088     DS_sig(sigcontext)  = wine_get_ds();
1089     ES_sig(sigcontext)  = wine_get_es();
1090     FS_sig(sigcontext)  = wine_get_fs();
1091     GS_sig(sigcontext)  = wine_get_gs();
1092     SS_sig(sigcontext)  = wine_get_ss();
1093
1094     return stack->rec_ptr;
1095 }
1096
1097
1098 /***********************************************************************
1099  *           setup_exception
1100  *
1101  * Setup a proper stack frame for the raise function, and modify the
1102  * sigcontext so that the return from the signal handler will call
1103  * the raise function.
1104  */
1105 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
1106 {
1107     WORD fs, gs;
1108     void *stack = init_handler( sigcontext, &fs, &gs );
1109
1110     return setup_exception_record( sigcontext, stack, fs, gs, func );
1111 }
1112
1113
1114 /***********************************************************************
1115  *           get_exception_context
1116  *
1117  * Get a pointer to the context built by setup_exception.
1118  */
1119 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
1120 {
1121     return (CONTEXT *)rec - 1;  /* cf. stack_layout structure */
1122 }
1123
1124
1125 /**********************************************************************
1126  *              get_fpu_code
1127  *
1128  * Get the FPU exception code from the FPU status.
1129  */
1130 static inline DWORD get_fpu_code( const CONTEXT *context )
1131 {
1132     DWORD status = context->FloatSave.StatusWord;
1133
1134     if (status & 0x01)  /* IE */
1135     {
1136         if (status & 0x40)  /* SF */
1137             return EXCEPTION_FLT_STACK_CHECK;
1138         else
1139             return EXCEPTION_FLT_INVALID_OPERATION;
1140     }
1141     if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND;  /* DE flag */
1142     if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO;    /* ZE flag */
1143     if (status & 0x08) return EXCEPTION_FLT_OVERFLOW;          /* OE flag */
1144     if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW;         /* UE flag */
1145     if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT;    /* PE flag */
1146     return EXCEPTION_FLT_INVALID_OPERATION;  /* generic error */
1147 }
1148
1149
1150 /**********************************************************************
1151  *              raise_segv_exception
1152  */
1153 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1154 {
1155     switch(rec->ExceptionCode)
1156     {
1157     case EXCEPTION_ACCESS_VIOLATION:
1158         if (rec->NumberParameters == 2)
1159         {
1160             if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT && check_atl_thunk( rec, context ))
1161                 goto done;
1162             rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] );
1163         }
1164         break;
1165     case EXCEPTION_DATATYPE_MISALIGNMENT:
1166         /* FIXME: pass through exception handler first? */
1167         if (context->EFlags & 0x00040000)
1168         {
1169             /* Disable AC flag, return */
1170             context->EFlags &= ~0x00040000;
1171             goto done;
1172         }
1173         break;
1174     }
1175     __regs_RtlRaiseException( rec, context );
1176 done:
1177     NtSetContextThread( GetCurrentThread(), context );
1178 }
1179
1180
1181 /**********************************************************************
1182  *              raise_trap_exception
1183  */
1184 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1185 {
1186     if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
1187     {
1188         struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
1189
1190         /* when single stepping can't tell whether this is a hw bp or a
1191          * single step interrupt. try to avoid as much overhead as possible
1192          * and only do a server call if there is any hw bp enabled. */
1193
1194         if( !(context->EFlags & 0x100) || (regs->dr7 & 0xff) )
1195         {
1196             /* (possible) hardware breakpoint, fetch the debug registers */
1197             context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
1198             NtGetContextThread(GetCurrentThread(), context);
1199             context->ContextFlags |= CONTEXT_FULL;  /* restore flags */
1200         }
1201
1202         context->EFlags &= ~0x100;  /* clear single-step flag */
1203     }
1204
1205     __regs_RtlRaiseException( rec, context );
1206     NtSetContextThread( GetCurrentThread(), context );
1207 }
1208
1209
1210 /**********************************************************************
1211  *              raise_exception
1212  *
1213  * Generic raise function for exceptions that don't need special treatment.
1214  */
1215 static void WINAPI raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1216 {
1217     __regs_RtlRaiseException( rec, context );
1218     NtSetContextThread( GetCurrentThread(), context );
1219 }
1220
1221
1222 #ifdef __HAVE_VM86
1223 /**********************************************************************
1224  *              raise_vm86_sti_exception
1225  */
1226 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1227 {
1228     /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
1229     get_vm86_teb_info()->vm86_pending |= VIP_FLAG;
1230
1231     if (ntdll_get_thread_data()->vm86_ptr)
1232     {
1233         if (((char*)context->Eip >= (char*)vm86_return) &&
1234             ((char*)context->Eip <= (char*)vm86_return_end) &&
1235             (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
1236             /* exiting from VM86, can't throw */
1237             goto done;
1238         }
1239         merge_vm86_pending_flags( rec );
1240     }
1241     else if (get_vm86_teb_info()->dpmi_vif &&
1242              !wine_ldt_is_system(context->SegCs) &&
1243              !wine_ldt_is_system(context->SegSs))
1244     {
1245         /* Executing DPMI code and virtual interrupts are enabled. */
1246         get_vm86_teb_info()->vm86_pending = 0;
1247         __regs_RtlRaiseException( rec, context );
1248     }
1249 done:
1250     NtSetContextThread( GetCurrentThread(), context );
1251 }
1252
1253
1254 /**********************************************************************
1255  *              usr2_handler
1256  *
1257  * Handler for SIGUSR2.
1258  * We use it to signal that the running __wine_enter_vm86() should
1259  * immediately set VIP_FLAG, causing pending events to be handled
1260  * as early as possible.
1261  */
1262 static void usr2_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1263 {
1264     EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_vm86_sti_exception );
1265     rec->ExceptionCode = EXCEPTION_VM86_STI;
1266 }
1267 #endif /* __HAVE_VM86 */
1268
1269
1270 /**********************************************************************
1271  *              segv_handler
1272  *
1273  * Handler for SIGSEGV and related errors.
1274  */
1275 static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1276 {
1277     WORD fs, gs;
1278     EXCEPTION_RECORD *rec;
1279     SIGCONTEXT *context = sigcontext;
1280     void *stack = init_handler( sigcontext, &fs, &gs );
1281
1282     /* check for page fault inside the thread stack */
1283     if (get_trap_code(context) == TRAP_x86_PAGEFLT &&
1284         (char *)siginfo->si_addr >= (char *)NtCurrentTeb()->DeallocationStack &&
1285         (char *)siginfo->si_addr < (char *)NtCurrentTeb()->Tib.StackBase &&
1286         virtual_handle_stack_fault( siginfo->si_addr ))
1287     {
1288         /* check if this was the last guard page */
1289         if ((char *)siginfo->si_addr < (char *)NtCurrentTeb()->DeallocationStack + 2*4096)
1290         {
1291             rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1292             rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1293         }
1294         return;
1295     }
1296
1297     rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1298     if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return;
1299
1300     switch(get_trap_code(context))
1301     {
1302     case TRAP_x86_OFLOW:   /* Overflow exception */
1303         rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
1304         break;
1305     case TRAP_x86_BOUND:   /* Bound range exception */
1306         rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
1307         break;
1308     case TRAP_x86_PRIVINFLT:   /* Invalid opcode exception */
1309         rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1310         break;
1311     case TRAP_x86_STKFLT:  /* Stack fault */
1312         rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1313         break;
1314     case TRAP_x86_SEGNPFLT:  /* Segment not present exception */
1315     case TRAP_x86_PROTFLT:   /* General protection fault */
1316     case TRAP_x86_UNKNOWN:   /* Unknown fault code */
1317         {
1318             WORD err = get_error_code(context);
1319             if (!err && (rec->ExceptionCode = is_privileged_instr( get_exception_context(rec) ))) break;
1320             rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1321             rec->NumberParameters = 2;
1322             rec->ExceptionInformation[0] = 0;
1323             /* if error contains a LDT selector, use that as fault address */
1324             if ((err & 7) == 4 && !wine_ldt_is_system( err | 7 ))
1325                 rec->ExceptionInformation[1] = err & ~7;
1326             else
1327                 rec->ExceptionInformation[1] = 0xffffffff;
1328         }
1329         break;
1330     case TRAP_x86_PAGEFLT:  /* Page fault */
1331         rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1332         rec->NumberParameters = 2;
1333         rec->ExceptionInformation[0] = (get_error_code(context) >> 1) & 0x09;
1334         rec->ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
1335         break;
1336     case TRAP_x86_ALIGNFLT:  /* Alignment check exception */
1337         rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
1338         break;
1339     default:
1340         WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1341         /* fall through */
1342     case TRAP_x86_NMI:       /* NMI interrupt */
1343     case TRAP_x86_DNA:       /* Device not available exception */
1344     case TRAP_x86_DOUBLEFLT: /* Double fault exception */
1345     case TRAP_x86_TSSFLT:    /* Invalid TSS exception */
1346     case TRAP_x86_MCHK:      /* Machine check exception */
1347     case TRAP_x86_CACHEFLT:  /* Cache flush exception */
1348         rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1349         break;
1350     }
1351 }
1352
1353
1354 /**********************************************************************
1355  *              trap_handler
1356  *
1357  * Handler for SIGTRAP.
1358  */
1359 static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1360 {
1361     SIGCONTEXT *context = sigcontext;
1362     EXCEPTION_RECORD *rec = setup_exception( context, raise_trap_exception );
1363
1364     switch(get_trap_code(context))
1365     {
1366     case TRAP_x86_TRCTRAP:  /* Single-step exception */
1367         rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1368         break;
1369     case TRAP_x86_BPTFLT:   /* Breakpoint exception */
1370         rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1;  /* back up over the int3 instruction */
1371         /* fall through */
1372     default:
1373         rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1374         break;
1375     }
1376 }
1377
1378
1379 /**********************************************************************
1380  *              fpe_handler
1381  *
1382  * Handler for SIGFPE.
1383  */
1384 static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1385 {
1386     CONTEXT *win_context;
1387     SIGCONTEXT *context = sigcontext;
1388     EXCEPTION_RECORD *rec = setup_exception( context, raise_exception );
1389
1390     win_context = get_exception_context( rec );
1391
1392     switch(get_trap_code(context))
1393     {
1394     case TRAP_x86_DIVIDE:   /* Division by zero exception */
1395         rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1396         break;
1397     case TRAP_x86_FPOPFLT:   /* Coprocessor segment overrun */
1398         rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1399         break;
1400     case TRAP_x86_ARITHTRAP:  /* Floating point exception */
1401     case TRAP_x86_UNKNOWN:    /* Unknown fault code */
1402         rec->ExceptionCode = get_fpu_code( win_context );
1403         break;
1404     case TRAP_x86_CACHEFLT:  /* SIMD exception */
1405         /* TODO:
1406          * Behaviour only tested for divide-by-zero exceptions
1407          * Check for other SIMD exceptions as well */
1408         if(siginfo->si_code != FPE_FLTDIV)
1409             FIXME("untested SIMD exception: %#x. Might not work correctly\n",
1410                   siginfo->si_code);
1411
1412         rec->ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS;
1413         rec->NumberParameters = 1;
1414         /* no idea what meaning is actually behind this but that's what native does */
1415         rec->ExceptionInformation[0] = 0;
1416         break;
1417     default:
1418         WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1419         rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1420         break;
1421     }
1422 }
1423
1424
1425 /**********************************************************************
1426  *              int_handler
1427  *
1428  * Handler for SIGINT.
1429  *
1430  * FIXME: should not be calling external functions on the signal stack.
1431  */
1432 static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1433 {
1434     WORD fs, gs;
1435     init_handler( sigcontext, &fs, &gs );
1436     if (!dispatch_signal(SIGINT))
1437     {
1438         EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1439         rec->ExceptionCode = CONTROL_C_EXIT;
1440     }
1441 }
1442
1443 /**********************************************************************
1444  *              abrt_handler
1445  *
1446  * Handler for SIGABRT.
1447  */
1448 static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1449 {
1450     EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1451     rec->ExceptionCode  = EXCEPTION_WINE_ASSERTION;
1452     rec->ExceptionFlags = EH_NONCONTINUABLE;
1453 }
1454
1455
1456 /**********************************************************************
1457  *              quit_handler
1458  *
1459  * Handler for SIGQUIT.
1460  */
1461 static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1462 {
1463     WORD fs, gs;
1464     init_handler( sigcontext, &fs, &gs );
1465     server_abort_thread(0);
1466 }
1467
1468
1469 /**********************************************************************
1470  *              usr1_handler
1471  *
1472  * Handler for SIGUSR1, used to signal a thread that it got suspended.
1473  */
1474 static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1475 {
1476     CONTEXT context;
1477     WORD fs, gs;
1478
1479     init_handler( sigcontext, &fs, &gs );
1480     save_context( &context, sigcontext, fs, gs );
1481     wait_suspend( &context );
1482     restore_context( &context, sigcontext );
1483 }
1484
1485
1486 /**********************************************************************
1487  *              get_signal_stack_total_size
1488  *
1489  * Retrieve the size to allocate for the signal stack, including the TEB at the bottom.
1490  * Must be a power of two.
1491  */
1492 size_t get_signal_stack_total_size(void)
1493 {
1494     static const size_t teb_size = 4096;  /* we reserve one page for the TEB */
1495
1496     if (!signal_stack_size)
1497     {
1498         size_t size = 8192, min_size = teb_size + max( MINSIGSTKSZ, 8192 );
1499         /* find the first power of two not smaller than min_size */
1500         while (size < min_size) size *= 2;
1501         signal_stack_mask = size - 1;
1502         signal_stack_size = size - teb_size;
1503     }
1504     return signal_stack_size + teb_size;
1505 }
1506
1507
1508 /***********************************************************************
1509  *           __wine_set_signal_handler   (NTDLL.@)
1510  */
1511 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1512 {
1513     if (sig >= sizeof(handlers) / sizeof(handlers[0])) return -1;
1514     if (handlers[sig] != NULL) return -2;
1515     handlers[sig] = wsh;
1516     return 0;
1517 }
1518
1519
1520 /**********************************************************************
1521  *              signal_init_thread
1522  */
1523 void signal_init_thread(void)
1524 {
1525 #ifdef HAVE_SIGALTSTACK
1526     stack_t ss;
1527
1528 #ifdef __APPLE__
1529     int mib[2], val = 1;
1530
1531     mib[0] = CTL_KERN;
1532     mib[1] = KERN_THALTSTACK;
1533     sysctl( mib, 2, NULL, NULL, &val, sizeof(val) );
1534 #endif
1535
1536     ss.ss_sp    = get_signal_stack();
1537     ss.ss_size  = signal_stack_size;
1538     ss.ss_flags = 0;
1539     if (sigaltstack(&ss, NULL) == -1) perror( "sigaltstack" );
1540 #endif  /* HAVE_SIGALTSTACK */
1541
1542     ntdll_get_thread_data()->gs = wine_get_gs();
1543 }
1544
1545 /**********************************************************************
1546  *              signal_init_process
1547  */
1548 void signal_init_process(void)
1549 {
1550     struct sigaction sig_act;
1551
1552     sig_act.sa_mask = server_block_set;
1553     sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1554 #ifdef SA_ONSTACK
1555     sig_act.sa_flags |= SA_ONSTACK;
1556 #endif
1557
1558     sig_act.sa_sigaction = int_handler;
1559     if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
1560     sig_act.sa_sigaction = fpe_handler;
1561     if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
1562     sig_act.sa_sigaction = abrt_handler;
1563     if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
1564     sig_act.sa_sigaction = quit_handler;
1565     if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
1566     sig_act.sa_sigaction = usr1_handler;
1567     if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
1568
1569     sig_act.sa_sigaction = segv_handler;
1570     if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
1571     if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
1572 #ifdef SIGBUS
1573     if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
1574 #endif
1575
1576 #ifdef SIGTRAP
1577     sig_act.sa_sigaction = trap_handler;
1578     if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
1579 #endif
1580
1581 #ifdef __HAVE_VM86
1582     sig_act.sa_sigaction = usr2_handler;
1583     if (sigaction( SIGUSR2, &sig_act, NULL ) == -1) goto error;
1584 #endif
1585
1586     signal_init_thread();
1587     return;
1588
1589  error:
1590     perror("sigaction");
1591     exit(1);
1592 }
1593
1594
1595 #ifdef __HAVE_VM86
1596 /**********************************************************************
1597  *              __wine_enter_vm86   (NTDLL.@)
1598  *
1599  * Enter vm86 mode with the specified register context.
1600  */
1601 void __wine_enter_vm86( CONTEXT *context )
1602 {
1603     EXCEPTION_RECORD rec;
1604     int res;
1605     struct vm86plus_struct vm86;
1606
1607     memset( &vm86, 0, sizeof(vm86) );
1608     for (;;)
1609     {
1610         restore_vm86_context( context, &vm86 );
1611
1612         ntdll_get_thread_data()->vm86_ptr = &vm86;
1613         merge_vm86_pending_flags( &rec );
1614
1615         res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1616         if (res < 0)
1617         {
1618             errno = -res;
1619             return;
1620         }
1621
1622         save_vm86_context( context, &vm86 );
1623
1624         rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
1625         rec.ExceptionRecord  = NULL;
1626         rec.ExceptionAddress = (LPVOID)context->Eip;
1627         rec.NumberParameters = 0;
1628
1629         switch(VM86_TYPE(res))
1630         {
1631         case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1632             rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1633             break;
1634         case VM86_TRAP: /* return due to DOS-debugger request */
1635             switch(VM86_ARG(res))
1636             {
1637             case TRAP_x86_TRCTRAP:  /* Single-step exception */
1638                 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
1639                 break;
1640             case TRAP_x86_BPTFLT:   /* Breakpoint exception */
1641                 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1;  /* back up over the int3 instruction */
1642                 /* fall through */
1643             default:
1644                 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
1645                 break;
1646             }
1647             break;
1648         case VM86_INTx: /* int3/int x instruction (ARG = x) */
1649             rec.ExceptionCode = EXCEPTION_VM86_INTx;
1650             rec.NumberParameters = 1;
1651             rec.ExceptionInformation[0] = VM86_ARG(res);
1652             break;
1653         case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1654             context->EFlags |= VIF_FLAG;
1655             context->EFlags &= ~VIP_FLAG;
1656             get_vm86_teb_info()->vm86_pending = 0;
1657             rec.ExceptionCode = EXCEPTION_VM86_STI;
1658             break;
1659         case VM86_PICRETURN: /* return due to pending PIC request */
1660             rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1661             break;
1662         case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
1663         default:
1664             WINE_ERR( "unhandled result from vm86 mode %x\n", res );
1665             continue;
1666         }
1667         __regs_RtlRaiseException( &rec, context );
1668     }
1669 }
1670
1671 #else /* __HAVE_VM86 */
1672 /**********************************************************************
1673  *              __wine_enter_vm86   (NTDLL.@)
1674  */
1675 void __wine_enter_vm86( CONTEXT *context )
1676 {
1677     MESSAGE("vm86 mode not supported on this platform\n");
1678 }
1679 #endif /* __HAVE_VM86 */
1680
1681 /**********************************************************************
1682  *              DbgBreakPoint   (NTDLL.@)
1683  */
1684 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret")
1685
1686 /**********************************************************************
1687  *              DbgUserBreakPoint   (NTDLL.@)
1688  */
1689 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret")
1690
1691
1692 /**********************************************************************
1693  *              EXC_CallHandler   (internal)
1694  *
1695  * Some exception handlers depend on EBP to have a fixed position relative to
1696  * the exception frame.
1697  * Shrinker depends on (*1) doing what it does,
1698  * (*2) being the exact instruction it is and (*3) beginning with 0x64
1699  * (i.e. the %fs prefix to the movl instruction). It also depends on the
1700  * function calling the handler having only 5 parameters (*4).
1701  */
1702 __ASM_GLOBAL_FUNC( EXC_CallHandler,
1703 "       pushl   %ebp\n"
1704 "       movl    %esp, %ebp\n"
1705 "       pushl   %ebx\n"
1706 "       movl    28(%ebp), %edx\n" /* ugly hack to pass the 6th param needed because of Shrinker */
1707 "       pushl   24(%ebp)\n"
1708 "       pushl   20(%ebp)\n"
1709 "       pushl   16(%ebp)\n"
1710 "       pushl   12(%ebp)\n"
1711 "       pushl   8(%ebp)\n"
1712 "       call    " __ASM_NAME("call_exception_handler") "\n"
1713 "       popl    %ebx\n"
1714 "       leave\n"
1715 "       ret\n"
1716 )
1717 __ASM_GLOBAL_FUNC(call_exception_handler,
1718 "       pushl   %ebp\n"
1719 "       movl    %esp, %ebp\n"
1720 "       subl    $12,%esp\n"
1721 "       pushl   12(%ebp)\n"       /* make any exceptions in this... */
1722 "       pushl   %edx\n"           /* handler be handled by... */
1723 "       .byte   0x64\n"
1724 "       pushl   (0)\n"            /* nested_handler (passed in edx). */
1725 "       .byte   0x64\n"
1726 "       movl    %esp,(0)\n"       /* push the new exception frame onto the exception stack. */
1727 "       pushl   20(%ebp)\n"
1728 "       pushl   16(%ebp)\n"
1729 "       pushl   12(%ebp)\n"
1730 "       pushl   8(%ebp)\n"
1731 "       movl    24(%ebp), %ecx\n" /* (*1) */
1732 "       call    *%ecx\n"          /* call handler. (*2) */
1733 "       .byte   0x64\n"
1734 "       movl    (0), %esp\n"      /* restore previous... (*3) */
1735 "       .byte   0x64\n"
1736 "       popl    (0)\n"            /* exception frame. */
1737 "       movl    %ebp, %esp\n"     /* restore saved stack, in case it was corrupted */
1738 "       popl    %ebp\n"
1739 "       ret     $20\n"            /* (*4) */
1740 )
1741 #endif  /* __i386__ */