dlls/ntdll/signal_arm.c

   1 /*
   2  * ARM signal handling routines
   3  *
   4  * Copyright 2002 Marcus Meissner, SuSE Linux AG
   5  * Copyright 2010-2013, 2015 André Hentschel
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #ifdef __arm__
  23
  24 #include "config.h"
  25 #include "wine/port.h"
  26
  27 #include <assert.h>
  28 #include <signal.h>
  29 #include <stdlib.h>
  30 #include <stdarg.h>
  31 #include <stdio.h>
  32 #ifdef HAVE_UNISTD_H
  33 # include <unistd.h>
  34 #endif
  35 #ifdef HAVE_SYS_PARAM_H
  36 # include <sys/param.h>
  37 #endif
  38 #ifdef HAVE_SYSCALL_H
  39 # include <syscall.h>
  40 #else
  41 # ifdef HAVE_SYS_SYSCALL_H
  42 #  include <sys/syscall.h>
  43 # endif
  44 #endif
  45 #ifdef HAVE_SYS_SIGNAL_H
  46 # include <sys/signal.h>
  47 #endif
  48 #ifdef HAVE_SYS_UCONTEXT_H
  49 # include <sys/ucontext.h>
  50 #endif
  51
  52 #define NONAMELESSUNION
  53 #define NONAMELESSSTRUCT
  54 #include "ntstatus.h"
  55 #define WIN32_NO_STATUS
  56 #include "windef.h"
  57 #include "winternl.h"
  58 #include "wine/library.h"
  59 #include "wine/exception.h"
  60 #include "ntdll_misc.h"
  61 #include "wine/debug.h"
  62 #include "winnt.h"
  63
  64 WINE_DEFAULT_DEBUG_CHANNEL(seh);
  65
  66 static pthread_key_t teb_key;
  67
  68 /***********************************************************************
  69  * signal context platform-specific definitions
  70  */
  71 #ifdef linux
  72
  73 #if defined(__ANDROID__) && !defined(HAVE_SYS_UCONTEXT_H)
  74 typedef struct ucontext
  75 {
  76     unsigned long uc_flags;
  77     struct ucontext *uc_link;
  78     stack_t uc_stack;
  79     struct sigcontext uc_mcontext;
  80     sigset_t uc_sigmask;
  81     unsigned long uc_regspace[128] __attribute__((__aligned__(8)));
  82 } ucontext_t;
  83 #endif
  84
  85 /* All Registers access - only for local access */
  86 # define REG_sig(reg_name, context) ((context)->uc_mcontext.reg_name)
  87 # define REGn_sig(reg_num, context) ((context)->uc_mcontext.arm_r##reg_num)
  88
  89 /* Special Registers access  */
  90 # define SP_sig(context)            REG_sig(arm_sp, context)    /* Stack pointer */
  91 # define LR_sig(context)            REG_sig(arm_lr, context)    /* Link register */
  92 # define PC_sig(context)            REG_sig(arm_pc, context)    /* Program counter */
  93 # define CPSR_sig(context)          REG_sig(arm_cpsr, context)  /* Current State Register */
  94 # define IP_sig(context)            REG_sig(arm_ip, context)    /* Intra-Procedure-call scratch register */
  95 # define FP_sig(context)            REG_sig(arm_fp, context)    /* Frame pointer */
  96
  97 /* Exceptions */
  98 # define ERROR_sig(context)         REG_sig(error_code, context)
  99 # define TRAP_sig(context)          REG_sig(trap_no, context)
 100
 101 #elif defined(__FreeBSD__)
 102
 103 /* All Registers access - only for local access */
 104 # define REGn_sig(reg_num, context) ((context)->uc_mcontext.__gregs[reg_num])
 105
 106 /* Special Registers access  */
 107 # define SP_sig(context)            REGn_sig(_REG_SP, context)    /* Stack pointer */
 108 # define LR_sig(context)            REGn_sig(_REG_LR, context)    /* Link register */
 109 # define PC_sig(context)            REGn_sig(_REG_PC, context)    /* Program counter */
 110 # define CPSR_sig(context)          REGn_sig(_REG_CPSR, context)  /* Current State Register */
 111 # define IP_sig(context)            REGn_sig(_REG_R12, context)   /* Intra-Procedure-call scratch register */
 112 # define FP_sig(context)            REGn_sig(_REG_FP, context)    /* Frame pointer */
 113
 114 #endif /* linux */
 115
 116 enum arm_trap_code
 117 {
 118     TRAP_ARM_UNKNOWN    = -1,  /* Unknown fault (TRAP_sig not defined) */
 119     TRAP_ARM_PRIVINFLT  =  6,  /* Invalid opcode exception */
 120     TRAP_ARM_PAGEFLT    = 14,  /* Page fault */
 121     TRAP_ARM_ALIGNFLT   = 17,  /* Alignment check exception */
 122 };
 123
 124 typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
 125 typedef int (*wine_signal_handler)(unsigned int sig);
 126
 127 static wine_signal_handler handlers[256];
 128
 129
 130 struct UNWIND_INFO
 131 {
 132     WORD function_length;
 133     WORD unknown1 : 7;
 134     WORD count : 5;
 135     WORD unknown2 : 4;
 136 };
 137
 138
 139 /***********************************************************************
 140  *           get_trap_code
 141  *
 142  * Get the trap code for a signal.
 143  */
 144 static inline enum arm_trap_code get_trap_code( const ucontext_t *sigcontext )
 145 {
 146 #ifdef TRAP_sig
 147     return TRAP_sig(sigcontext);
 148 #else
 149     return TRAP_ARM_UNKNOWN;  /* unknown trap code */
 150 #endif
 151 }
 152
 153 /***********************************************************************
 154  *           get_error_code
 155  *
 156  * Get the error code for a signal.
 157  */
 158 static inline WORD get_error_code( const ucontext_t *sigcontext )
 159 {
 160 #ifdef ERROR_sig
 161     return ERROR_sig(sigcontext);
 162 #else
 163     return 0;
 164 #endif
 165 }
 166
 167 /***********************************************************************
 168  *           dispatch_signal
 169  */
 170 static inline int dispatch_signal(unsigned int sig)
 171 {
 172     if (handlers[sig] == NULL) return 0;
 173     return handlers[sig](sig);
 174 }
 175
 176 /*******************************************************************
 177  *         is_valid_frame
 178  */
 179 static inline BOOL is_valid_frame( void *frame )
 180 {
 181     if ((ULONG_PTR)frame & 3) return FALSE;
 182     return (frame >= NtCurrentTeb()->Tib.StackLimit &&
 183             (void **)frame < (void **)NtCurrentTeb()->Tib.StackBase - 1);
 184 }
 185
 186 /***********************************************************************
 187  *           save_context
 188  *
 189  * Set the register values from a sigcontext.
 190  */
 191 static void save_context( CONTEXT *context, const ucontext_t *sigcontext )
 192 {
 193 #define C(x) context->R##x = REGn_sig(x,sigcontext)
 194     /* Save normal registers */
 195     C(0); C(1); C(2); C(3); C(4); C(5); C(6); C(7); C(8); C(9); C(10);
 196 #undef C
 197
 198     context->ContextFlags = CONTEXT_FULL;
 199     context->Sp   = SP_sig(sigcontext);   /* Stack pointer */
 200     context->Lr   = LR_sig(sigcontext);   /* Link register */
 201     context->Pc   = PC_sig(sigcontext);   /* Program Counter */
 202     context->Cpsr = CPSR_sig(sigcontext); /* Current State Register */
 203     context->Ip   = IP_sig(sigcontext);   /* Intra-Procedure-call scratch register */
 204     context->Fp   = FP_sig(sigcontext);   /* Frame pointer */
 205 }
 206
 207
 208 /***********************************************************************
 209  *           restore_context
 210  *
 211  * Build a sigcontext from the register values.
 212  */
 213 static void restore_context( const CONTEXT *context, ucontext_t *sigcontext )
 214 {
 215 #define C(x)  REGn_sig(x,sigcontext) = context->R##x
 216     /* Restore normal registers */
 217     C(0); C(1); C(2); C(3); C(4); C(5); C(6); C(7); C(8); C(9); C(10);
 218 #undef C
 219
 220     SP_sig(sigcontext)   = context->Sp;   /* Stack pointer */
 221     LR_sig(sigcontext)   = context->Lr ;  /* Link register */
 222     PC_sig(sigcontext)   = context->Pc;   /* Program Counter */
 223     CPSR_sig(sigcontext) = context->Cpsr; /* Current State Register */
 224     IP_sig(sigcontext)   = context->Ip;   /* Intra-Procedure-call scratch register */
 225     FP_sig(sigcontext)   = context->Fp;   /* Frame pointer */
 226 }
 227
 228
 229 /***********************************************************************
 230  *           save_fpu
 231  *
 232  * Set the FPU context from a sigcontext.
 233  */
 234 static inline void save_fpu( CONTEXT *context, const ucontext_t *sigcontext )
 235 {
 236     FIXME("not implemented\n");
 237 }
 238
 239
 240 /***********************************************************************
 241  *           restore_fpu
 242  *
 243  * Restore the FPU context to a sigcontext.
 244  */
 245 static inline void restore_fpu( CONTEXT *context, const ucontext_t *sigcontext )
 246 {
 247     FIXME("not implemented\n");
 248 }
 249
 250 /**************************************************************************
 251  *              __chkstk (NTDLL.@)
 252  *
 253  * Incoming r4 contains words to allocate, converting to bytes then return
 254  */
 255 __ASM_GLOBAL_FUNC( __chkstk, "lsl r4, r4, #2\n\t"
 256                              "bx lr" )
 257
 258 /***********************************************************************
 259  *              RtlCaptureContext (NTDLL.@)
 260  */
 261 /* FIXME: Use the Stack instead of the actual register values */
 262 __ASM_STDCALL_FUNC( RtlCaptureContext, 4,
 263                     ".arm\n\t"
 264                     "stmfd SP!, {r1}\n\t"
 265                     "mov r1, #0x0200000\n\t"/* CONTEXT_ARM */
 266                     "add r1, r1, #0x3\n\t"  /* CONTEXT_FULL */
 267                     "str r1, [r0]\n\t"      /* context->ContextFlags */
 268                     "ldmfd SP!, {r1}\n\t"
 269                     "str r0, [r0, #0x4]\n\t"   /* context->R0 */
 270                     "str r1, [r0, #0x8]\n\t"   /* context->R1 */
 271                     "str r2, [r0, #0xc]\n\t"   /* context->R2 */
 272                     "str r3, [r0, #0x10]\n\t"  /* context->R3 */
 273                     "str r4, [r0, #0x14]\n\t"  /* context->R4 */
 274                     "str r5, [r0, #0x18]\n\t"  /* context->R5 */
 275                     "str r6, [r0, #0x1c]\n\t"  /* context->R6 */
 276                     "str r7, [r0, #0x20]\n\t"  /* context->R7 */
 277                     "str r8, [r0, #0x24]\n\t"  /* context->R8 */
 278                     "str r9, [r0, #0x28]\n\t"  /* context->R9 */
 279                     "str r10, [r0, #0x2c]\n\t" /* context->R10 */
 280                     "str r11, [r0, #0x30]\n\t" /* context->Fp */
 281                     "str IP, [r0, #0x34]\n\t"  /* context->Ip */
 282                     "str SP, [r0, #0x38]\n\t"  /* context->Sp */
 283                     "str LR, [r0, #0x3c]\n\t"  /* context->Lr */
 284                     "str PC, [r0, #0x40]\n\t"  /* context->Pc */
 285                     "mrs r1, CPSR\n\t"
 286                     "str r1, [r0, #0x44]\n\t"  /* context->Cpsr */
 287                     "bx lr"
 288                     )
 289
 290
 291 /***********************************************************************
 292  *           set_cpu_context
 293  *
 294  * Set the new CPU context.
 295  */
 296 /* FIXME: What about the CPSR? */
 297 __ASM_GLOBAL_FUNC( set_cpu_context,
 298                    "mov IP, r0\n\t"
 299                    "ldr r0,  [IP, #0x4]\n\t"  /* context->R0 */
 300                    "ldr r1,  [IP, #0x8]\n\t"  /* context->R1 */
 301                    "ldr r2,  [IP, #0xc]\n\t"  /* context->R2 */
 302                    "ldr r3,  [IP, #0x10]\n\t" /* context->R3 */
 303                    "ldr r4,  [IP, #0x14]\n\t" /* context->R4 */
 304                    "ldr r5,  [IP, #0x18]\n\t" /* context->R5 */
 305                    "ldr r6,  [IP, #0x1c]\n\t" /* context->R6 */
 306                    "ldr r7,  [IP, #0x20]\n\t" /* context->R7 */
 307                    "ldr r8,  [IP, #0x24]\n\t" /* context->R8 */
 308                    "ldr r9,  [IP, #0x28]\n\t" /* context->R9 */
 309                    "ldr r10, [IP, #0x2c]\n\t" /* context->R10 */
 310                    "ldr r11, [IP, #0x30]\n\t" /* context->Fp */
 311                    "ldr SP,  [IP, #0x38]\n\t" /* context->Sp */
 312                    "ldr LR,  [IP, #0x3c]\n\t" /* context->Lr */
 313                    "ldr PC,  [IP, #0x40]\n\t" /* context->Pc */
 314                    )
 315
 316
 317 /***********************************************************************
 318  *           copy_context
 319  *
 320  * Copy a register context according to the flags.
 321  */
 322 void copy_context( CONTEXT *to, const CONTEXT *from, DWORD flags )
 323 {
 324     flags &= ~CONTEXT_ARM;  /* get rid of CPU id */
 325     if (flags & CONTEXT_CONTROL)
 326     {
 327         to->Sp      = from->Sp;
 328         to->Lr      = from->Lr;
 329         to->Pc      = from->Pc;
 330         to->Cpsr    = from->Cpsr;
 331     }
 332     if (flags & CONTEXT_INTEGER)
 333     {
 334         to->R0  = from->R0;
 335         to->R1  = from->R1;
 336         to->R2  = from->R2;
 337         to->R3  = from->R3;
 338         to->R4  = from->R4;
 339         to->R5  = from->R5;
 340         to->R6  = from->R6;
 341         to->R7  = from->R7;
 342         to->R8  = from->R8;
 343         to->R9  = from->R9;
 344         to->R10 = from->R10;
 345         to->Ip  = from->Ip;
 346         to->Fp  = from->Fp;
 347     }
 348 }
 349
 350
 351 /***********************************************************************
 352  *           context_to_server
 353  *
 354  * Convert a register context to the server format.
 355  */
 356 NTSTATUS context_to_server( context_t *to, const CONTEXT *from )
 357 {
 358     DWORD flags = from->ContextFlags & ~CONTEXT_ARM;  /* get rid of CPU id */
 359
 360     memset( to, 0, sizeof(*to) );
 361     to->cpu = CPU_ARM;
 362
 363     if (flags & CONTEXT_CONTROL)
 364     {
 365         to->flags |= SERVER_CTX_CONTROL;
 366         to->ctl.arm_regs.sp   = from->Sp;
 367         to->ctl.arm_regs.lr   = from->Lr;
 368         to->ctl.arm_regs.pc   = from->Pc;
 369         to->ctl.arm_regs.cpsr = from->Cpsr;
 370     }
 371     if (flags & CONTEXT_INTEGER)
 372     {
 373         to->flags |= SERVER_CTX_INTEGER;
 374         to->integer.arm_regs.r[0]  = from->R0;
 375         to->integer.arm_regs.r[1]  = from->R1;
 376         to->integer.arm_regs.r[2]  = from->R2;
 377         to->integer.arm_regs.r[3]  = from->R3;
 378         to->integer.arm_regs.r[4]  = from->R4;
 379         to->integer.arm_regs.r[5]  = from->R5;
 380         to->integer.arm_regs.r[6]  = from->R6;
 381         to->integer.arm_regs.r[7]  = from->R7;
 382         to->integer.arm_regs.r[8]  = from->R8;
 383         to->integer.arm_regs.r[9]  = from->R9;
 384         to->integer.arm_regs.r[10] = from->R10;
 385         to->integer.arm_regs.r[11] = from->Fp;
 386         to->integer.arm_regs.r[12] = from->Ip;
 387     }
 388     return STATUS_SUCCESS;
 389 }
 390
 391
 392 /***********************************************************************
 393  *           context_from_server
 394  *
 395  * Convert a register context from the server format.
 396  */
 397 NTSTATUS context_from_server( CONTEXT *to, const context_t *from )
 398 {
 399     if (from->cpu != CPU_ARM) return STATUS_INVALID_PARAMETER;
 400
 401     to->ContextFlags = CONTEXT_ARM;
 402     if (from->flags & SERVER_CTX_CONTROL)
 403     {
 404         to->ContextFlags |= CONTEXT_CONTROL;
 405         to->Sp   = from->ctl.arm_regs.sp;
 406         to->Lr   = from->ctl.arm_regs.lr;
 407         to->Pc   = from->ctl.arm_regs.pc;
 408         to->Cpsr = from->ctl.arm_regs.cpsr;
 409     }
 410     if (from->flags & SERVER_CTX_INTEGER)
 411     {
 412         to->ContextFlags |= CONTEXT_INTEGER;
 413         to->R0  = from->integer.arm_regs.r[0];
 414         to->R1  = from->integer.arm_regs.r[1];
 415         to->R2  = from->integer.arm_regs.r[2];
 416         to->R3  = from->integer.arm_regs.r[3];
 417         to->R4  = from->integer.arm_regs.r[4];
 418         to->R5  = from->integer.arm_regs.r[5];
 419         to->R6  = from->integer.arm_regs.r[6];
 420         to->R7  = from->integer.arm_regs.r[7];
 421         to->R8  = from->integer.arm_regs.r[8];
 422         to->R9  = from->integer.arm_regs.r[9];
 423         to->R10 = from->integer.arm_regs.r[10];
 424         to->Fp  = from->integer.arm_regs.r[11];
 425         to->Ip  = from->integer.arm_regs.r[12];
 426      }
 427     return STATUS_SUCCESS;
 428 }
 429
 430 extern void raise_func_trampoline_thumb( EXCEPTION_RECORD *rec, CONTEXT *context, raise_func func );
 431 __ASM_GLOBAL_FUNC( raise_func_trampoline_thumb,
 432                    ".thumb\n\t"
 433                    "blx r2\n\t"
 434                    "bkpt")
 435
 436 extern void raise_func_trampoline_arm( EXCEPTION_RECORD *rec, CONTEXT *context, raise_func func );
 437 __ASM_GLOBAL_FUNC( raise_func_trampoline_arm,
 438                    ".arm\n\t"
 439                    "blx r2\n\t"
 440                    "bkpt")
 441
 442 /***********************************************************************
 443  *           setup_exception_record
 444  *
 445  * Setup the exception record and context on the thread stack.
 446  */
 447 static EXCEPTION_RECORD *setup_exception( ucontext_t *sigcontext, raise_func func )
 448 {
 449     struct stack_layout
 450     {
 451         CONTEXT           context;
 452         EXCEPTION_RECORD  rec;
 453     } *stack;
 454     DWORD exception_code = 0;
 455
 456     stack = (struct stack_layout *)(SP_sig(sigcontext) & ~3);
 457     stack--;  /* push the stack_layout structure */
 458
 459     stack->rec.ExceptionRecord  = NULL;
 460     stack->rec.ExceptionCode    = exception_code;
 461     stack->rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 462     stack->rec.ExceptionAddress = (LPVOID)PC_sig(sigcontext);
 463     stack->rec.NumberParameters = 0;
 464
 465     save_context( &stack->context, sigcontext );
 466
 467     /* now modify the sigcontext to return to the raise function */
 468     SP_sig(sigcontext) = (DWORD)stack;
 469     if (CPSR_sig(sigcontext) & 0x20)
 470         PC_sig(sigcontext) = (DWORD)raise_func_trampoline_thumb;
 471     else
 472         PC_sig(sigcontext) = (DWORD)raise_func_trampoline_arm;
 473     REGn_sig(0, sigcontext) = (DWORD)&stack->rec;  /* first arg for raise_func */
 474     REGn_sig(1, sigcontext) = (DWORD)&stack->context; /* second arg for raise_func */
 475     REGn_sig(2, sigcontext) = (DWORD)func; /* the raise_func as third arg for the trampoline */
 476
 477
 478     return &stack->rec;
 479 }
 480
 481 /**********************************************************************
 482  *              raise_segv_exception
 483  */
 484 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
 485 {
 486     NTSTATUS status;
 487
 488     switch(rec->ExceptionCode)
 489     {
 490     case EXCEPTION_ACCESS_VIOLATION:
 491         if (rec->NumberParameters == 2)
 492         {
 493             if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
 494                                                              rec->ExceptionInformation[0], FALSE )))
 495                 goto done;
 496         }
 497         break;
 498     }
 499     status = NtRaiseException( rec, context, TRUE );
 500     if (status) raise_status( status, rec );
 501 done:
 502     set_cpu_context( context );
 503 }
 504
 505 /**********************************************************************
 506  *           call_stack_handlers
 507  *
 508  * Call the stack handlers chain.
 509  */
 510 static NTSTATUS call_stack_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
 511 {
 512     EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
 513     DWORD res;
 514
 515     frame = NtCurrentTeb()->Tib.ExceptionList;
 516     nested_frame = NULL;
 517     while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
 518     {
 519         /* Check frame address */
 520         if (!is_valid_frame( frame ))
 521         {
 522             rec->ExceptionFlags |= EH_STACK_INVALID;
 523             break;
 524         }
 525
 526         /* Call handler */
 527         TRACE( "calling handler at %p code=%x flags=%x\n",
 528                frame->Handler, rec->ExceptionCode, rec->ExceptionFlags );
 529         res = frame->Handler( rec, frame, context, &dispatch );
 530         TRACE( "handler at %p returned %x\n", frame->Handler, res );
 531
 532         if (frame == nested_frame)
 533         {
 534             /* no longer nested */
 535             nested_frame = NULL;
 536             rec->ExceptionFlags &= ~EH_NESTED_CALL;
 537         }
 538
 539         switch(res)
 540         {
 541         case ExceptionContinueExecution:
 542             if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return STATUS_SUCCESS;
 543             return STATUS_NONCONTINUABLE_EXCEPTION;
 544         case ExceptionContinueSearch:
 545             break;
 546         case ExceptionNestedException:
 547             if (nested_frame < dispatch) nested_frame = dispatch;
 548             rec->ExceptionFlags |= EH_NESTED_CALL;
 549             break;
 550         default:
 551             return STATUS_INVALID_DISPOSITION;
 552         }
 553         frame = frame->Prev;
 554     }
 555     return STATUS_UNHANDLED_EXCEPTION;
 556 }
 557
 558
 559 /*******************************************************************
 560  *              raise_exception
 561  *
 562  * Implementation of NtRaiseException.
 563  */
 564 static NTSTATUS raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
 565 {
 566     NTSTATUS status;
 567
 568     if (first_chance)
 569     {
 570         DWORD c;
 571
 572         TRACE( "code=%x flags=%x addr=%p pc=%08x tid=%04x\n",
 573                rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
 574                context->Pc, GetCurrentThreadId() );
 575         for (c = 0; c < rec->NumberParameters; c++)
 576             TRACE( " info[%d]=%08lx\n", c, rec->ExceptionInformation[c] );
 577         if (rec->ExceptionCode == EXCEPTION_WINE_STUB)
 578         {
 579             if (rec->ExceptionInformation[1] >> 16)
 580                 MESSAGE( "wine: Call from %p to unimplemented function %s.%s, aborting\n",
 581                          rec->ExceptionAddress,
 582                          (char*)rec->ExceptionInformation[0], (char*)rec->ExceptionInformation[1] );
 583             else
 584                 MESSAGE( "wine: Call from %p to unimplemented function %s.%ld, aborting\n",
 585                          rec->ExceptionAddress,
 586                          (char*)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
 587         }
 588         else
 589         {
 590             TRACE( " r0=%08x r1=%08x r2=%08x r3=%08x r4=%08x r5=%08x\n",
 591                    context->R0, context->R1, context->R2, context->R3, context->R4, context->R5 );
 592             TRACE( " r6=%08x r7=%08x r8=%08x r9=%08x r10=%08x fp=%08x\n",
 593                    context->R6, context->R7, context->R8, context->R9, context->R10, context->Fp );
 594             TRACE( " ip=%08x sp=%08x lr=%08x pc=%08x cpsr=%08x\n",
 595                    context->Ip, context->Sp, context->Lr, context->Pc, context->Cpsr );
 596         }
 597
 598         status = send_debug_event( rec, TRUE, context );
 599         if (status == DBG_CONTINUE || status == DBG_EXCEPTION_HANDLED)
 600             return STATUS_SUCCESS;
 601
 602         if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION)
 603             return STATUS_SUCCESS;
 604
 605         if ((status = call_stack_handlers( rec, context )) != STATUS_UNHANDLED_EXCEPTION)
 606             return status;
 607     }
 608
 609     /* last chance exception */
 610
 611     status = send_debug_event( rec, FALSE, context );
 612     if (status != DBG_CONTINUE)
 613     {
 614         if (rec->ExceptionFlags & EH_STACK_INVALID)
 615             ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
 616         else if (rec->ExceptionCode == STATUS_NONCONTINUABLE_EXCEPTION)
 617             ERR("Process attempted to continue execution after noncontinuable exception.\n");
 618         else
 619             ERR("Unhandled exception code %x flags %x addr %p\n",
 620                 rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
 621         NtTerminateProcess( NtCurrentProcess(), rec->ExceptionCode );
 622     }
 623     return STATUS_SUCCESS;
 624 }
 625
 626
 627 /**********************************************************************
 628  *              segv_handler
 629  *
 630  * Handler for SIGSEGV and related errors.
 631  */
 632 static void segv_handler( int signal, siginfo_t *info, void *ucontext )
 633 {
 634     EXCEPTION_RECORD *rec;
 635     ucontext_t *context = ucontext;
 636
 637     /* check for page fault inside the thread stack */
 638     if (get_trap_code(context) == TRAP_ARM_PAGEFLT &&
 639         (char *)info->si_addr >= (char *)NtCurrentTeb()->DeallocationStack &&
 640         (char *)info->si_addr < (char *)NtCurrentTeb()->Tib.StackBase &&
 641         virtual_handle_stack_fault( info->si_addr ))
 642     {
 643         /* check if this was the last guard page */
 644         if ((char *)info->si_addr < (char *)NtCurrentTeb()->DeallocationStack + 2*4096)
 645         {
 646             rec = setup_exception( context, raise_segv_exception );
 647             rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
 648         }
 649         return;
 650     }
 651
 652     rec = setup_exception( context, raise_segv_exception );
 653     if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return;
 654
 655     switch(get_trap_code(context))
 656     {
 657     case TRAP_ARM_PRIVINFLT:   /* Invalid opcode exception */
 658         rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 659         break;
 660     case TRAP_ARM_PAGEFLT:  /* Page fault */
 661         rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
 662         rec->NumberParameters = 2;
 663         rec->ExceptionInformation[0] = (get_error_code(context) & 0x800) != 0;
 664         rec->ExceptionInformation[1] = (ULONG_PTR)info->si_addr;
 665         break;
 666     case TRAP_ARM_ALIGNFLT:  /* Alignment check exception */
 667         rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
 668         break;
 669     case TRAP_ARM_UNKNOWN:   /* Unknown fault code */
 670         rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
 671         rec->NumberParameters = 2;
 672         rec->ExceptionInformation[0] = 0;
 673         rec->ExceptionInformation[1] = 0xffffffff;
 674         break;
 675     default:
 676         ERR("Got unexpected trap %d\n", get_trap_code(context));
 677         rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 678         break;
 679     }
 680 }
 681
 682 /**********************************************************************
 683  *              trap_handler
 684  *
 685  * Handler for SIGTRAP.
 686  */
 687 static void trap_handler( int signal, siginfo_t *info, void *ucontext )
 688 {
 689     EXCEPTION_RECORD rec;
 690     CONTEXT context;
 691     NTSTATUS status;
 692
 693     switch ( info->si_code )
 694     {
 695     case TRAP_TRACE:
 696         rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
 697         break;
 698     case TRAP_BRKPT:
 699     default:
 700         rec.ExceptionCode = EXCEPTION_BREAKPOINT;
 701         break;
 702     }
 703
 704     save_context( &context, ucontext );
 705     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 706     rec.ExceptionRecord  = NULL;
 707     rec.ExceptionAddress = (LPVOID)context.Pc;
 708     rec.NumberParameters = 0;
 709     status = raise_exception( &rec, &context, TRUE );
 710     if (status) raise_status( status, &rec );
 711     restore_context( &context, ucontext );
 712 }
 713
 714 /**********************************************************************
 715  *              fpe_handler
 716  *
 717  * Handler for SIGFPE.
 718  */
 719 static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
 720 {
 721     EXCEPTION_RECORD rec;
 722     CONTEXT context;
 723     NTSTATUS status;
 724
 725     save_fpu( &context, sigcontext );
 726     save_context( &context, sigcontext );
 727
 728     switch (siginfo->si_code & 0xffff )
 729     {
 730 #ifdef FPE_FLTSUB
 731     case FPE_FLTSUB:
 732         rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
 733         break;
 734 #endif
 735 #ifdef FPE_INTDIV
 736     case FPE_INTDIV:
 737         rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
 738         break;
 739 #endif
 740 #ifdef FPE_INTOVF
 741     case FPE_INTOVF:
 742         rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
 743         break;
 744 #endif
 745 #ifdef FPE_FLTDIV
 746     case FPE_FLTDIV:
 747         rec.ExceptionCode = EXCEPTION_FLT_DIVIDE_BY_ZERO;
 748         break;
 749 #endif
 750 #ifdef FPE_FLTOVF
 751     case FPE_FLTOVF:
 752         rec.ExceptionCode = EXCEPTION_FLT_OVERFLOW;
 753         break;
 754 #endif
 755 #ifdef FPE_FLTUND
 756     case FPE_FLTUND:
 757         rec.ExceptionCode = EXCEPTION_FLT_UNDERFLOW;
 758         break;
 759 #endif
 760 #ifdef FPE_FLTRES
 761     case FPE_FLTRES:
 762         rec.ExceptionCode = EXCEPTION_FLT_INEXACT_RESULT;
 763         break;
 764 #endif
 765 #ifdef FPE_FLTINV
 766     case FPE_FLTINV:
 767 #endif
 768     default:
 769         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 770         break;
 771     }
 772     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 773     rec.ExceptionRecord  = NULL;
 774     rec.ExceptionAddress = (LPVOID)context.Pc;
 775     rec.NumberParameters = 0;
 776     status = raise_exception( &rec, &context, TRUE );
 777     if (status) raise_status( status, &rec );
 778
 779     restore_context( &context, sigcontext );
 780     restore_fpu( &context, sigcontext );
 781 }
 782
 783 /**********************************************************************
 784  *              int_handler
 785  *
 786  * Handler for SIGINT.
 787  */
 788 static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
 789 {
 790     if (!dispatch_signal(SIGINT))
 791     {
 792         EXCEPTION_RECORD rec;
 793         CONTEXT context;
 794         NTSTATUS status;
 795
 796         save_context( &context, sigcontext );
 797         rec.ExceptionCode    = CONTROL_C_EXIT;
 798         rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 799         rec.ExceptionRecord  = NULL;
 800         rec.ExceptionAddress = (LPVOID)context.Pc;
 801         rec.NumberParameters = 0;
 802         status = raise_exception( &rec, &context, TRUE );
 803         if (status) raise_status( status, &rec );
 804         restore_context( &context, sigcontext );
 805     }
 806 }
 807
 808
 809 /**********************************************************************
 810  *              abrt_handler
 811  *
 812  * Handler for SIGABRT.
 813  */
 814 static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
 815 {
 816     EXCEPTION_RECORD rec;
 817     CONTEXT context;
 818     NTSTATUS status;
 819
 820     save_context( &context, sigcontext );
 821     rec.ExceptionCode    = EXCEPTION_WINE_ASSERTION;
 822     rec.ExceptionFlags   = EH_NONCONTINUABLE;
 823     rec.ExceptionRecord  = NULL;
 824     rec.ExceptionAddress = (LPVOID)context.Pc;
 825     rec.NumberParameters = 0;
 826     status = raise_exception( &rec, &context, TRUE );
 827     if (status) raise_status( status, &rec );
 828     restore_context( &context, sigcontext );
 829 }
 830
 831
 832 /**********************************************************************
 833  *              quit_handler
 834  *
 835  * Handler for SIGQUIT.
 836  */
 837 static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
 838 {
 839     abort_thread(0);
 840 }
 841
 842
 843 /**********************************************************************
 844  *              usr1_handler
 845  *
 846  * Handler for SIGUSR1, used to signal a thread that it got suspended.
 847  */
 848 static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
 849 {
 850     CONTEXT context;
 851
 852     save_context( &context, sigcontext );
 853     wait_suspend( &context );
 854     restore_context( &context, sigcontext );
 855 }
 856
 857
 858 /***********************************************************************
 859  *           __wine_set_signal_handler   (NTDLL.@)
 860  */
 861 int CDECL __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
 862 {
 863     if (sig >= sizeof(handlers) / sizeof(handlers[0])) return -1;
 864     if (handlers[sig] != NULL) return -2;
 865     handlers[sig] = wsh;
 866     return 0;
 867 }
 868
 869
 870 /**********************************************************************
 871  *             signal_alloc_thread
 872  */
 873 NTSTATUS signal_alloc_thread( TEB **teb )
 874 {
 875     static size_t sigstack_zero_bits;
 876     SIZE_T size;
 877     NTSTATUS status;
 878
 879     if (!sigstack_zero_bits)
 880     {
 881         size_t min_size = page_size;
 882         /* find the first power of two not smaller than min_size */
 883         while ((1u << sigstack_zero_bits) < min_size) sigstack_zero_bits++;
 884         assert( sizeof(TEB) <= min_size );
 885     }
 886
 887     size = 1 << sigstack_zero_bits;
 888     *teb = NULL;
 889     if (!(status = NtAllocateVirtualMemory( NtCurrentProcess(), (void **)teb, sigstack_zero_bits,
 890                                             &size, MEM_COMMIT | MEM_TOP_DOWN, PAGE_READWRITE )))
 891     {
 892         (*teb)->Tib.Self = &(*teb)->Tib;
 893         (*teb)->Tib.ExceptionList = (void *)~0UL;
 894     }
 895     return status;
 896 }
 897
 898
 899 /**********************************************************************
 900  *             signal_free_thread
 901  */
 902 void signal_free_thread( TEB *teb )
 903 {
 904     SIZE_T size;
 905
 906     if (teb->DeallocationStack)
 907     {
 908         size = 0;
 909         NtFreeVirtualMemory( GetCurrentProcess(), &teb->DeallocationStack, &size, MEM_RELEASE );
 910     }
 911     size = 0;
 912     NtFreeVirtualMemory( NtCurrentProcess(), (void **)&teb, &size, MEM_RELEASE );
 913 }
 914
 915
 916 /**********************************************************************
 917  *              signal_init_thread
 918  */
 919 void signal_init_thread( TEB *teb )
 920 {
 921     static BOOL init_done;
 922
 923     if (!init_done)
 924     {
 925         pthread_key_create( &teb_key, NULL );
 926         init_done = TRUE;
 927     }
 928
 929 #if defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_8A__)
 930     /* Win32/ARM applications expect the TEB pointer to be in the TPIDRURW register. */
 931     __asm__ __volatile__( "mcr p15, 0, %0, c13, c0, 2" : : "r" (teb) );
 932 #endif
 933
 934     pthread_setspecific( teb_key, teb );
 935 }
 936
 937
 938 /**********************************************************************
 939  *              signal_init_process
 940  */
 941 void signal_init_process(void)
 942 {
 943     struct sigaction sig_act;
 944
 945     sig_act.sa_mask = server_block_set;
 946     sig_act.sa_flags = SA_RESTART | SA_SIGINFO;
 947
 948     sig_act.sa_sigaction = int_handler;
 949     if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
 950     sig_act.sa_sigaction = fpe_handler;
 951     if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
 952     sig_act.sa_sigaction = abrt_handler;
 953     if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
 954     sig_act.sa_sigaction = quit_handler;
 955     if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
 956     sig_act.sa_sigaction = usr1_handler;
 957     if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
 958
 959     sig_act.sa_sigaction = segv_handler;
 960     if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
 961     if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
 962 #ifdef SIGBUS
 963     if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
 964 #endif
 965
 966 #ifdef SIGTRAP
 967     sig_act.sa_sigaction = trap_handler;
 968     if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
 969 #endif
 970     return;
 971
 972  error:
 973     perror("sigaction");
 974     exit(1);
 975 }
 976
 977
 978 /**********************************************************************
 979  *              __wine_enter_vm86   (NTDLL.@)
 980  */
 981 void __wine_enter_vm86( CONTEXT *context )
 982 {
 983     MESSAGE("vm86 mode not supported on this platform\n");
 984 }
 985
 986
 987 /**********************************************************************
 988  *              RtlAddFunctionTable   (NTDLL.@)
 989  */
 990 BOOLEAN CDECL RtlAddFunctionTable( RUNTIME_FUNCTION *table, DWORD count, DWORD addr )
 991 {
 992     FIXME( "%p %u %x: stub\n", table, count, addr );
 993     return TRUE;
 994 }
 995
 996
 997 /**********************************************************************
 998  *              RtlDeleteFunctionTable   (NTDLL.@)
 999  */
1000 BOOLEAN CDECL RtlDeleteFunctionTable( RUNTIME_FUNCTION *table )
1001 {
1002     FIXME( "%p: stub\n", table );
1003     return TRUE;
1004 }
1005
1006 /**********************************************************************
1007  *              find_function_info
1008  */
1009 static RUNTIME_FUNCTION *find_function_info( ULONG_PTR pc, HMODULE module,
1010                                              RUNTIME_FUNCTION *func, ULONG size )
1011 {
1012     int min = 0;
1013     int max = size/sizeof(*func) - 1;
1014
1015     while (min <= max)
1016     {
1017         int pos = (min + max) / 2;
1018         DWORD begin = (func[pos].BeginAddress & ~1), end;
1019         if (func[pos].u.s.Flag)
1020             end = begin + func[pos].u.s.FunctionLength * 2;
1021         else
1022         {
1023             struct UNWIND_INFO *info;
1024             info = (struct UNWIND_INFO *)((char *)module + func[pos].u.UnwindData);
1025             end = begin + info->function_length * 2;
1026         }
1027
1028         if ((char *)pc < (char *)module + begin) max = pos - 1;
1029         else if ((char *)pc >= (char *)module + end) min = pos + 1;
1030         else return func + pos;
1031     }
1032     return NULL;
1033 }
1034
1035 /**********************************************************************
1036  *              RtlLookupFunctionEntry   (NTDLL.@)
1037  */
1038 PRUNTIME_FUNCTION WINAPI RtlLookupFunctionEntry( ULONG_PTR pc, DWORD *base,
1039                                                  UNWIND_HISTORY_TABLE *table )
1040 {
1041     LDR_MODULE *module;
1042     RUNTIME_FUNCTION *func;
1043     ULONG size;
1044
1045     /* FIXME: should use the history table to make things faster */
1046
1047     if (LdrFindEntryForAddress( (void *)pc, &module ))
1048     {
1049         WARN( "module not found for %lx\n", pc );
1050         return NULL;
1051     }
1052     if (!(func = RtlImageDirectoryEntryToData( module->BaseAddress, TRUE,
1053                                                IMAGE_DIRECTORY_ENTRY_EXCEPTION, &size )))
1054     {
1055         WARN( "no exception table found in module %p pc %lx\n", module->BaseAddress, pc );
1056         return NULL;
1057     }
1058     func = find_function_info( pc, module->BaseAddress, func, size );
1059     if (func) *base = (DWORD)module->BaseAddress;
1060     return func;
1061 }
1062
1063 /***********************************************************************
1064  *            RtlUnwind  (NTDLL.@)
1065  */
1066 void WINAPI RtlUnwind( void *endframe, void *target_ip, EXCEPTION_RECORD *rec, void *retval )
1067 {
1068     CONTEXT context;
1069     EXCEPTION_RECORD record;
1070     EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
1071     DWORD res;
1072
1073     RtlCaptureContext( &context );
1074     context.R0 = (DWORD)retval;
1075
1076     /* build an exception record, if we do not have one */
1077     if (!rec)
1078     {
1079         record.ExceptionCode    = STATUS_UNWIND;
1080         record.ExceptionFlags   = 0;
1081         record.ExceptionRecord  = NULL;
1082         record.ExceptionAddress = (void *)context.Pc;
1083         record.NumberParameters = 0;
1084         rec = &record;
1085     }
1086
1087     rec->ExceptionFlags |= EH_UNWINDING | (endframe ? 0 : EH_EXIT_UNWIND);
1088
1089     TRACE( "code=%x flags=%x\n", rec->ExceptionCode, rec->ExceptionFlags );
1090
1091     /* get chain of exception frames */
1092     frame = NtCurrentTeb()->Tib.ExceptionList;
1093     while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != endframe))
1094     {
1095         /* Check frame address */
1096         if (endframe && ((void*)frame > endframe))
1097             raise_status( STATUS_INVALID_UNWIND_TARGET, rec );
1098
1099         if (!is_valid_frame( frame )) raise_status( STATUS_BAD_STACK, rec );
1100
1101         /* Call handler */
1102         TRACE( "calling handler at %p code=%x flags=%x\n",
1103                frame->Handler, rec->ExceptionCode, rec->ExceptionFlags );
1104         res = frame->Handler(rec, frame, &context, &dispatch);
1105         TRACE( "handler at %p returned %x\n", frame->Handler, res );
1106
1107         switch(res)
1108         {
1109         case ExceptionContinueSearch:
1110             break;
1111         case ExceptionCollidedUnwind:
1112             frame = dispatch;
1113             break;
1114         default:
1115             raise_status( STATUS_INVALID_DISPOSITION, rec );
1116             break;
1117         }
1118         frame = __wine_pop_frame( frame );
1119     }
1120 }
1121
1122 /*******************************************************************
1123  *              NtRaiseException (NTDLL.@)
1124  */
1125 NTSTATUS WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
1126 {
1127     NTSTATUS status = raise_exception( rec, context, first_chance );
1128     if (status == STATUS_SUCCESS) NtSetContextThread( GetCurrentThread(), context );
1129     return status;
1130 }
1131
1132 /***********************************************************************
1133  *              RtlRaiseException (NTDLL.@)
1134  */
1135 void WINAPI RtlRaiseException( EXCEPTION_RECORD *rec )
1136 {
1137     CONTEXT context;
1138     NTSTATUS status;
1139
1140     RtlCaptureContext( &context );
1141     rec->ExceptionAddress = (LPVOID)context.Pc;
1142     status = raise_exception( rec, &context, TRUE );
1143     if (status) raise_status( status, rec );
1144 }
1145
1146 /*************************************************************************
1147  *             RtlCaptureStackBackTrace (NTDLL.@)
1148  */
1149 USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer, ULONG *hash )
1150 {
1151     FIXME( "(%d, %d, %p, %p) stub!\n", skip, count, buffer, hash );
1152     return 0;
1153 }
1154
1155 /***********************************************************************
1156  *           call_thread_entry_point
1157  */
1158 void call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg )
1159 {
1160     __TRY
1161     {
1162         exit_thread( entry( arg ));
1163     }
1164     __EXCEPT(unhandled_exception_filter)
1165     {
1166         NtTerminateThread( GetCurrentThread(), GetExceptionCode() );
1167     }
1168     __ENDTRY
1169     abort();  /* should not be reached */
1170 }
1171
1172 /***********************************************************************
1173  *           RtlExitUserThread  (NTDLL.@)
1174  */
1175 void WINAPI RtlExitUserThread( ULONG status )
1176 {
1177     exit_thread( status );
1178 }
1179
1180 /***********************************************************************
1181  *           abort_thread
1182  */
1183 void abort_thread( int status )
1184 {
1185     terminate_thread( status );
1186 }
1187
1188 /**********************************************************************
1189  *              DbgBreakPoint   (NTDLL.@)
1190  */
1191 void WINAPI DbgBreakPoint(void)
1192 {
1193      kill(getpid(), SIGTRAP);
1194 }
1195
1196 /**********************************************************************
1197  *              DbgUserBreakPoint   (NTDLL.@)
1198  */
1199 void WINAPI DbgUserBreakPoint(void)
1200 {
1201      kill(getpid(), SIGTRAP);
1202 }
1203
1204 /**********************************************************************
1205  *           NtCurrentTeb   (NTDLL.@)
1206  */
1207 TEB * WINAPI NtCurrentTeb(void)
1208 {
1209     return pthread_getspecific( teb_key );
1210 }
1211
1212 #endif  /* __arm__ */