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 /***********************************************************************
 252  *              RtlCaptureContext (NTDLL.@)
 253  */
 254 /* FIXME: Use the Stack instead of the actual register values */
 255 __ASM_STDCALL_FUNC( RtlCaptureContext, 4,
 256                     ".arm\n\t"
 257                     "stmfd SP!, {r1}\n\t"
 258                     "mov r1, #0x40\n\t"     /* CONTEXT_ARM */
 259                     "add r1, r1, #0x3\n\t"  /* CONTEXT_FULL */
 260                     "str r1, [r0]\n\t"      /* context->ContextFlags */
 261                     "ldmfd SP!, {r1}\n\t"
 262                     "str r0, [r0, #0x4]\n\t"   /* context->R0 */
 263                     "str r1, [r0, #0x8]\n\t"   /* context->R1 */
 264                     "str r2, [r0, #0xc]\n\t"   /* context->R2 */
 265                     "str r3, [r0, #0x10]\n\t"  /* context->R3 */
 266                     "str r4, [r0, #0x14]\n\t"  /* context->R4 */
 267                     "str r5, [r0, #0x18]\n\t"  /* context->R5 */
 268                     "str r6, [r0, #0x1c]\n\t"  /* context->R6 */
 269                     "str r7, [r0, #0x20]\n\t"  /* context->R7 */
 270                     "str r8, [r0, #0x24]\n\t"  /* context->R8 */
 271                     "str r9, [r0, #0x28]\n\t"  /* context->R9 */
 272                     "str r10, [r0, #0x2c]\n\t" /* context->R10 */
 273                     "str r11, [r0, #0x30]\n\t" /* context->Fp */
 274                     "str IP, [r0, #0x34]\n\t"  /* context->Ip */
 275                     "str SP, [r0, #0x38]\n\t"  /* context->Sp */
 276                     "str LR, [r0, #0x3c]\n\t"  /* context->Lr */
 277                     "str PC, [r0, #0x40]\n\t"  /* context->Pc */
 278                     "mrs r1, CPSR\n\t"
 279                     "str r1, [r0, #0x44]\n\t"  /* context->Cpsr */
 280                     "mov PC, LR\n"
 281                     )
 282
 283
 284 /***********************************************************************
 285  *           set_cpu_context
 286  *
 287  * Set the new CPU context.
 288  */
 289 /* FIXME: What about the CPSR? */
 290 __ASM_GLOBAL_FUNC( set_cpu_context,
 291                    "mov IP, r0\n\t"
 292                    "ldr r0,  [IP, #0x4]\n\t"  /* context->R0 */
 293                    "ldr r1,  [IP, #0x8]\n\t"  /* context->R1 */
 294                    "ldr r2,  [IP, #0xc]\n\t"  /* context->R2 */
 295                    "ldr r3,  [IP, #0x10]\n\t" /* context->R3 */
 296                    "ldr r4,  [IP, #0x14]\n\t" /* context->R4 */
 297                    "ldr r5,  [IP, #0x18]\n\t" /* context->R5 */
 298                    "ldr r6,  [IP, #0x1c]\n\t" /* context->R6 */
 299                    "ldr r7,  [IP, #0x20]\n\t" /* context->R7 */
 300                    "ldr r8,  [IP, #0x24]\n\t" /* context->R8 */
 301                    "ldr r9,  [IP, #0x28]\n\t" /* context->R9 */
 302                    "ldr r10, [IP, #0x2c]\n\t" /* context->R10 */
 303                    "ldr r11, [IP, #0x30]\n\t" /* context->Fp */
 304                    "ldr SP,  [IP, #0x38]\n\t" /* context->Sp */
 305                    "ldr LR,  [IP, #0x3c]\n\t" /* context->Lr */
 306                    "ldr PC,  [IP, #0x40]\n\t" /* context->Pc */
 307                    )
 308
 309
 310 /***********************************************************************
 311  *           copy_context
 312  *
 313  * Copy a register context according to the flags.
 314  */
 315 void copy_context( CONTEXT *to, const CONTEXT *from, DWORD flags )
 316 {
 317     flags &= ~CONTEXT_ARM;  /* get rid of CPU id */
 318     if (flags & CONTEXT_CONTROL)
 319     {
 320         to->Sp      = from->Sp;
 321         to->Lr      = from->Lr;
 322         to->Pc      = from->Pc;
 323         to->Cpsr    = from->Cpsr;
 324     }
 325     if (flags & CONTEXT_INTEGER)
 326     {
 327         to->R0  = from->R0;
 328         to->R1  = from->R1;
 329         to->R2  = from->R2;
 330         to->R3  = from->R3;
 331         to->R4  = from->R4;
 332         to->R5  = from->R5;
 333         to->R6  = from->R6;
 334         to->R7  = from->R7;
 335         to->R8  = from->R8;
 336         to->R9  = from->R9;
 337         to->R10 = from->R10;
 338         to->Ip  = from->Ip;
 339         to->Fp  = from->Fp;
 340     }
 341 }
 342
 343
 344 /***********************************************************************
 345  *           context_to_server
 346  *
 347  * Convert a register context to the server format.
 348  */
 349 NTSTATUS context_to_server( context_t *to, const CONTEXT *from )
 350 {
 351     DWORD flags = from->ContextFlags & ~CONTEXT_ARM;  /* get rid of CPU id */
 352
 353     memset( to, 0, sizeof(*to) );
 354     to->cpu = CPU_ARM;
 355
 356     if (flags & CONTEXT_CONTROL)
 357     {
 358         to->flags |= SERVER_CTX_CONTROL;
 359         to->ctl.arm_regs.sp   = from->Sp;
 360         to->ctl.arm_regs.lr   = from->Lr;
 361         to->ctl.arm_regs.pc   = from->Pc;
 362         to->ctl.arm_regs.cpsr = from->Cpsr;
 363     }
 364     if (flags & CONTEXT_INTEGER)
 365     {
 366         to->flags |= SERVER_CTX_INTEGER;
 367         to->integer.arm_regs.r[0]  = from->R0;
 368         to->integer.arm_regs.r[1]  = from->R1;
 369         to->integer.arm_regs.r[2]  = from->R2;
 370         to->integer.arm_regs.r[3]  = from->R3;
 371         to->integer.arm_regs.r[4]  = from->R4;
 372         to->integer.arm_regs.r[5]  = from->R5;
 373         to->integer.arm_regs.r[6]  = from->R6;
 374         to->integer.arm_regs.r[7]  = from->R7;
 375         to->integer.arm_regs.r[8]  = from->R8;
 376         to->integer.arm_regs.r[9]  = from->R9;
 377         to->integer.arm_regs.r[10] = from->R10;
 378         to->integer.arm_regs.r[11] = from->Fp;
 379         to->integer.arm_regs.r[12] = from->Ip;
 380     }
 381     return STATUS_SUCCESS;
 382 }
 383
 384
 385 /***********************************************************************
 386  *           context_from_server
 387  *
 388  * Convert a register context from the server format.
 389  */
 390 NTSTATUS context_from_server( CONTEXT *to, const context_t *from )
 391 {
 392     if (from->cpu != CPU_ARM) return STATUS_INVALID_PARAMETER;
 393
 394     to->ContextFlags = CONTEXT_ARM;
 395     if (from->flags & SERVER_CTX_CONTROL)
 396     {
 397         to->ContextFlags |= CONTEXT_CONTROL;
 398         to->Sp   = from->ctl.arm_regs.sp;
 399         to->Lr   = from->ctl.arm_regs.lr;
 400         to->Pc   = from->ctl.arm_regs.pc;
 401         to->Cpsr = from->ctl.arm_regs.cpsr;
 402     }
 403     if (from->flags & SERVER_CTX_INTEGER)
 404     {
 405         to->ContextFlags |= CONTEXT_INTEGER;
 406         to->R0  = from->integer.arm_regs.r[0];
 407         to->R1  = from->integer.arm_regs.r[1];
 408         to->R2  = from->integer.arm_regs.r[2];
 409         to->R3  = from->integer.arm_regs.r[3];
 410         to->R4  = from->integer.arm_regs.r[4];
 411         to->R5  = from->integer.arm_regs.r[5];
 412         to->R6  = from->integer.arm_regs.r[6];
 413         to->R7  = from->integer.arm_regs.r[7];
 414         to->R8  = from->integer.arm_regs.r[8];
 415         to->R9  = from->integer.arm_regs.r[9];
 416         to->R10 = from->integer.arm_regs.r[10];
 417         to->Fp  = from->integer.arm_regs.r[11];
 418         to->Ip  = from->integer.arm_regs.r[12];
 419      }
 420     return STATUS_SUCCESS;
 421 }
 422
 423 extern void raise_func_trampoline_thumb( EXCEPTION_RECORD *rec, CONTEXT *context, raise_func func );
 424 __ASM_GLOBAL_FUNC( raise_func_trampoline_thumb,
 425                    ".thumb\n\t"
 426                    "blx r2\n\t"
 427                    "bkpt")
 428
 429 extern void raise_func_trampoline_arm( EXCEPTION_RECORD *rec, CONTEXT *context, raise_func func );
 430 __ASM_GLOBAL_FUNC( raise_func_trampoline_arm,
 431                    ".arm\n\t"
 432                    "blx r2\n\t"
 433                    "bkpt")
 434
 435 /***********************************************************************
 436  *           setup_exception_record
 437  *
 438  * Setup the exception record and context on the thread stack.
 439  */
 440 static EXCEPTION_RECORD *setup_exception( ucontext_t *sigcontext, raise_func func )
 441 {
 442     struct stack_layout
 443     {
 444         CONTEXT           context;
 445         EXCEPTION_RECORD  rec;
 446     } *stack;
 447     DWORD exception_code = 0;
 448
 449     stack = (struct stack_layout *)(SP_sig(sigcontext) & ~3);
 450     stack--;  /* push the stack_layout structure */
 451
 452     stack->rec.ExceptionRecord  = NULL;
 453     stack->rec.ExceptionCode    = exception_code;
 454     stack->rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 455     stack->rec.ExceptionAddress = (LPVOID)PC_sig(sigcontext);
 456     stack->rec.NumberParameters = 0;
 457
 458     save_context( &stack->context, sigcontext );
 459
 460     /* now modify the sigcontext to return to the raise function */
 461     SP_sig(sigcontext) = (DWORD)stack;
 462     if (CPSR_sig(sigcontext) & 0x20)
 463         PC_sig(sigcontext) = (DWORD)raise_func_trampoline_thumb;
 464     else
 465         PC_sig(sigcontext) = (DWORD)raise_func_trampoline_arm;
 466     REGn_sig(0, sigcontext) = (DWORD)&stack->rec;  /* first arg for raise_func */
 467     REGn_sig(1, sigcontext) = (DWORD)&stack->context; /* second arg for raise_func */
 468     REGn_sig(2, sigcontext) = (DWORD)func; /* the raise_func as third arg for the trampoline */
 469
 470
 471     return &stack->rec;
 472 }
 473
 474 /**********************************************************************
 475  *              raise_segv_exception
 476  */
 477 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
 478 {
 479     NTSTATUS status;
 480
 481     switch(rec->ExceptionCode)
 482     {
 483     case EXCEPTION_ACCESS_VIOLATION:
 484         if (rec->NumberParameters == 2)
 485         {
 486             if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
 487                                                              rec->ExceptionInformation[0], FALSE )))
 488                 goto done;
 489         }
 490         break;
 491     }
 492     status = NtRaiseException( rec, context, TRUE );
 493     if (status) raise_status( status, rec );
 494 done:
 495     set_cpu_context( context );
 496 }
 497
 498 /**********************************************************************
 499  *           call_stack_handlers
 500  *
 501  * Call the stack handlers chain.
 502  */
 503 static NTSTATUS call_stack_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
 504 {
 505     EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
 506     DWORD res;
 507
 508     frame = NtCurrentTeb()->Tib.ExceptionList;
 509     nested_frame = NULL;
 510     while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
 511     {
 512         /* Check frame address */
 513         if (!is_valid_frame( frame ))
 514         {
 515             rec->ExceptionFlags |= EH_STACK_INVALID;
 516             break;
 517         }
 518
 519         /* Call handler */
 520         TRACE( "calling handler at %p code=%x flags=%x\n",
 521                frame->Handler, rec->ExceptionCode, rec->ExceptionFlags );
 522         res = frame->Handler( rec, frame, context, &dispatch );
 523         TRACE( "handler at %p returned %x\n", frame->Handler, res );
 524
 525         if (frame == nested_frame)
 526         {
 527             /* no longer nested */
 528             nested_frame = NULL;
 529             rec->ExceptionFlags &= ~EH_NESTED_CALL;
 530         }
 531
 532         switch(res)
 533         {
 534         case ExceptionContinueExecution:
 535             if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return STATUS_SUCCESS;
 536             return STATUS_NONCONTINUABLE_EXCEPTION;
 537         case ExceptionContinueSearch:
 538             break;
 539         case ExceptionNestedException:
 540             if (nested_frame < dispatch) nested_frame = dispatch;
 541             rec->ExceptionFlags |= EH_NESTED_CALL;
 542             break;
 543         default:
 544             return STATUS_INVALID_DISPOSITION;
 545         }
 546         frame = frame->Prev;
 547     }
 548     return STATUS_UNHANDLED_EXCEPTION;
 549 }
 550
 551
 552 /*******************************************************************
 553  *              raise_exception
 554  *
 555  * Implementation of NtRaiseException.
 556  */
 557 static NTSTATUS raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
 558 {
 559     NTSTATUS status;
 560
 561     if (first_chance)
 562     {
 563         DWORD c;
 564
 565         TRACE( "code=%x flags=%x addr=%p pc=%08x tid=%04x\n",
 566                rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
 567                context->Pc, GetCurrentThreadId() );
 568         for (c = 0; c < rec->NumberParameters; c++)
 569             TRACE( " info[%d]=%08lx\n", c, rec->ExceptionInformation[c] );
 570         if (rec->ExceptionCode == EXCEPTION_WINE_STUB)
 571         {
 572             if (rec->ExceptionInformation[1] >> 16)
 573                 MESSAGE( "wine: Call from %p to unimplemented function %s.%s, aborting\n",
 574                          rec->ExceptionAddress,
 575                          (char*)rec->ExceptionInformation[0], (char*)rec->ExceptionInformation[1] );
 576             else
 577                 MESSAGE( "wine: Call from %p to unimplemented function %s.%ld, aborting\n",
 578                          rec->ExceptionAddress,
 579                          (char*)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
 580         }
 581         else
 582         {
 583             TRACE( " r0=%08x r1=%08x r2=%08x r3=%08x r4=%08x r5=%08x\n",
 584                    context->R0, context->R1, context->R2, context->R3, context->R4, context->R5 );
 585             TRACE( " r6=%08x r7=%08x r8=%08x r9=%08x r10=%08x fp=%08x\n",
 586                    context->R6, context->R7, context->R8, context->R9, context->R10, context->Fp );
 587             TRACE( " ip=%08x sp=%08x lr=%08x pc=%08x cpsr=%08x\n",
 588                    context->Ip, context->Sp, context->Lr, context->Pc, context->Cpsr );
 589         }
 590
 591         status = send_debug_event( rec, TRUE, context );
 592         if (status == DBG_CONTINUE || status == DBG_EXCEPTION_HANDLED)
 593             return STATUS_SUCCESS;
 594
 595         if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION)
 596             return STATUS_SUCCESS;
 597
 598         if ((status = call_stack_handlers( rec, context )) != STATUS_UNHANDLED_EXCEPTION)
 599             return status;
 600     }
 601
 602     /* last chance exception */
 603
 604     status = send_debug_event( rec, FALSE, context );
 605     if (status != DBG_CONTINUE)
 606     {
 607         if (rec->ExceptionFlags & EH_STACK_INVALID)
 608             ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
 609         else if (rec->ExceptionCode == STATUS_NONCONTINUABLE_EXCEPTION)
 610             ERR("Process attempted to continue execution after noncontinuable exception.\n");
 611         else
 612             ERR("Unhandled exception code %x flags %x addr %p\n",
 613                 rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
 614         NtTerminateProcess( NtCurrentProcess(), rec->ExceptionCode );
 615     }
 616     return STATUS_SUCCESS;
 617 }
 618
 619
 620 /**********************************************************************
 621  *              segv_handler
 622  *
 623  * Handler for SIGSEGV and related errors.
 624  */
 625 static void segv_handler( int signal, siginfo_t *info, void *ucontext )
 626 {
 627     EXCEPTION_RECORD *rec;
 628     ucontext_t *context = ucontext;
 629
 630     /* check for page fault inside the thread stack */
 631     if (get_trap_code(context) == TRAP_ARM_PAGEFLT &&
 632         (char *)info->si_addr >= (char *)NtCurrentTeb()->DeallocationStack &&
 633         (char *)info->si_addr < (char *)NtCurrentTeb()->Tib.StackBase &&
 634         virtual_handle_stack_fault( info->si_addr ))
 635     {
 636         /* check if this was the last guard page */
 637         if ((char *)info->si_addr < (char *)NtCurrentTeb()->DeallocationStack + 2*4096)
 638         {
 639             rec = setup_exception( context, raise_segv_exception );
 640             rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
 641         }
 642         return;
 643     }
 644
 645     rec = setup_exception( context, raise_segv_exception );
 646     if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return;
 647
 648     switch(get_trap_code(context))
 649     {
 650     case TRAP_ARM_PRIVINFLT:   /* Invalid opcode exception */
 651         rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 652         break;
 653     case TRAP_ARM_PAGEFLT:  /* Page fault */
 654         rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
 655         rec->NumberParameters = 2;
 656         rec->ExceptionInformation[0] = (get_error_code(context) & 0x800) != 0;
 657         rec->ExceptionInformation[1] = (ULONG_PTR)info->si_addr;
 658         break;
 659     case TRAP_ARM_ALIGNFLT:  /* Alignment check exception */
 660         rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
 661         break;
 662     case TRAP_ARM_UNKNOWN:   /* Unknown fault code */
 663         rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
 664         rec->NumberParameters = 2;
 665         rec->ExceptionInformation[0] = 0;
 666         rec->ExceptionInformation[1] = 0xffffffff;
 667         break;
 668     default:
 669         ERR("Got unexpected trap %d\n", get_trap_code(context));
 670         rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 671         break;
 672     }
 673 }
 674
 675 /**********************************************************************
 676  *              trap_handler
 677  *
 678  * Handler for SIGTRAP.
 679  */
 680 static void trap_handler( int signal, siginfo_t *info, void *ucontext )
 681 {
 682     EXCEPTION_RECORD rec;
 683     CONTEXT context;
 684     NTSTATUS status;
 685
 686     switch ( info->si_code )
 687     {
 688     case TRAP_TRACE:
 689         rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
 690         break;
 691     case TRAP_BRKPT:
 692     default:
 693         rec.ExceptionCode = EXCEPTION_BREAKPOINT;
 694         break;
 695     }
 696
 697     save_context( &context, ucontext );
 698     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 699     rec.ExceptionRecord  = NULL;
 700     rec.ExceptionAddress = (LPVOID)context.Pc;
 701     rec.NumberParameters = 0;
 702     status = raise_exception( &rec, &context, TRUE );
 703     if (status) raise_status( status, &rec );
 704     restore_context( &context, ucontext );
 705 }
 706
 707 /**********************************************************************
 708  *              fpe_handler
 709  *
 710  * Handler for SIGFPE.
 711  */
 712 static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
 713 {
 714     EXCEPTION_RECORD rec;
 715     CONTEXT context;
 716     NTSTATUS status;
 717
 718     save_fpu( &context, sigcontext );
 719     save_context( &context, sigcontext );
 720
 721     switch (siginfo->si_code & 0xffff )
 722     {
 723 #ifdef FPE_FLTSUB
 724     case FPE_FLTSUB:
 725         rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
 726         break;
 727 #endif
 728 #ifdef FPE_INTDIV
 729     case FPE_INTDIV:
 730         rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
 731         break;
 732 #endif
 733 #ifdef FPE_INTOVF
 734     case FPE_INTOVF:
 735         rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
 736         break;
 737 #endif
 738 #ifdef FPE_FLTDIV
 739     case FPE_FLTDIV:
 740         rec.ExceptionCode = EXCEPTION_FLT_DIVIDE_BY_ZERO;
 741         break;
 742 #endif
 743 #ifdef FPE_FLTOVF
 744     case FPE_FLTOVF:
 745         rec.ExceptionCode = EXCEPTION_FLT_OVERFLOW;
 746         break;
 747 #endif
 748 #ifdef FPE_FLTUND
 749     case FPE_FLTUND:
 750         rec.ExceptionCode = EXCEPTION_FLT_UNDERFLOW;
 751         break;
 752 #endif
 753 #ifdef FPE_FLTRES
 754     case FPE_FLTRES:
 755         rec.ExceptionCode = EXCEPTION_FLT_INEXACT_RESULT;
 756         break;
 757 #endif
 758 #ifdef FPE_FLTINV
 759     case FPE_FLTINV:
 760 #endif
 761     default:
 762         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 763         break;
 764     }
 765     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 766     rec.ExceptionRecord  = NULL;
 767     rec.ExceptionAddress = (LPVOID)context.Pc;
 768     rec.NumberParameters = 0;
 769     status = raise_exception( &rec, &context, TRUE );
 770     if (status) raise_status( status, &rec );
 771
 772     restore_context( &context, sigcontext );
 773     restore_fpu( &context, sigcontext );
 774 }
 775
 776 /**********************************************************************
 777  *              int_handler
 778  *
 779  * Handler for SIGINT.
 780  */
 781 static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
 782 {
 783     if (!dispatch_signal(SIGINT))
 784     {
 785         EXCEPTION_RECORD rec;
 786         CONTEXT context;
 787         NTSTATUS status;
 788
 789         save_context( &context, sigcontext );
 790         rec.ExceptionCode    = CONTROL_C_EXIT;
 791         rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 792         rec.ExceptionRecord  = NULL;
 793         rec.ExceptionAddress = (LPVOID)context.Pc;
 794         rec.NumberParameters = 0;
 795         status = raise_exception( &rec, &context, TRUE );
 796         if (status) raise_status( status, &rec );
 797         restore_context( &context, sigcontext );
 798     }
 799 }
 800
 801
 802 /**********************************************************************
 803  *              abrt_handler
 804  *
 805  * Handler for SIGABRT.
 806  */
 807 static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
 808 {
 809     EXCEPTION_RECORD rec;
 810     CONTEXT context;
 811     NTSTATUS status;
 812
 813     save_context( &context, sigcontext );
 814     rec.ExceptionCode    = EXCEPTION_WINE_ASSERTION;
 815     rec.ExceptionFlags   = EH_NONCONTINUABLE;
 816     rec.ExceptionRecord  = NULL;
 817     rec.ExceptionAddress = (LPVOID)context.Pc;
 818     rec.NumberParameters = 0;
 819     status = raise_exception( &rec, &context, TRUE );
 820     if (status) raise_status( status, &rec );
 821     restore_context( &context, sigcontext );
 822 }
 823
 824
 825 /**********************************************************************
 826  *              quit_handler
 827  *
 828  * Handler for SIGQUIT.
 829  */
 830 static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
 831 {
 832     abort_thread(0);
 833 }
 834
 835
 836 /**********************************************************************
 837  *              usr1_handler
 838  *
 839  * Handler for SIGUSR1, used to signal a thread that it got suspended.
 840  */
 841 static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
 842 {
 843     CONTEXT context;
 844
 845     save_context( &context, sigcontext );
 846     wait_suspend( &context );
 847     restore_context( &context, sigcontext );
 848 }
 849
 850
 851 /***********************************************************************
 852  *           __wine_set_signal_handler   (NTDLL.@)
 853  */
 854 int CDECL __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
 855 {
 856     if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
 857     if (handlers[sig] != NULL) return -2;
 858     handlers[sig] = wsh;
 859     return 0;
 860 }
 861
 862
 863 /**********************************************************************
 864  *             signal_alloc_thread
 865  */
 866 NTSTATUS signal_alloc_thread( TEB **teb )
 867 {
 868     static size_t sigstack_zero_bits;
 869     SIZE_T size;
 870     NTSTATUS status;
 871
 872     if (!sigstack_zero_bits)
 873     {
 874         size_t min_size = page_size;
 875         /* find the first power of two not smaller than min_size */
 876         while ((1u << sigstack_zero_bits) < min_size) sigstack_zero_bits++;
 877         assert( sizeof(TEB) <= min_size );
 878     }
 879
 880     size = 1 << sigstack_zero_bits;
 881     *teb = NULL;
 882     if (!(status = NtAllocateVirtualMemory( NtCurrentProcess(), (void **)teb, sigstack_zero_bits,
 883                                             &size, MEM_COMMIT | MEM_TOP_DOWN, PAGE_READWRITE )))
 884     {
 885         (*teb)->Tib.Self = &(*teb)->Tib;
 886         (*teb)->Tib.ExceptionList = (void *)~0UL;
 887     }
 888     return status;
 889 }
 890
 891
 892 /**********************************************************************
 893  *             signal_free_thread
 894  */
 895 void signal_free_thread( TEB *teb )
 896 {
 897     SIZE_T size;
 898
 899     if (teb->DeallocationStack)
 900     {
 901         size = 0;
 902         NtFreeVirtualMemory( GetCurrentProcess(), &teb->DeallocationStack, &size, MEM_RELEASE );
 903     }
 904     size = 0;
 905     NtFreeVirtualMemory( NtCurrentProcess(), (void **)&teb, &size, MEM_RELEASE );
 906 }
 907
 908 /**********************************************************************
 909  *      set_tpidrurw
 910  *
 911  * Win32/ARM applications expect the TEB pointer to be in the TPIDRURW register.
 912  */
 913 #ifdef __ARM_ARCH_7A__
 914 extern void set_tpidrurw( TEB *teb );
 915 __ASM_GLOBAL_FUNC( set_tpidrurw,
 916                    "mcr p15, 0, r0, c13, c0, 2\n\t" /* TEB -> TPIDRURW */
 917                    "blx lr" )
 918 #else
 919 void set_tpidrurw( TEB *teb )
 920 {
 921 }
 922 #endif
 923
 924 /**********************************************************************
 925  *              signal_init_thread
 926  */
 927 void signal_init_thread( TEB *teb )
 928 {
 929     static BOOL init_done;
 930
 931     if (!init_done)
 932     {
 933         pthread_key_create( &teb_key, NULL );
 934         init_done = TRUE;
 935     }
 936     set_tpidrurw( teb );
 937     pthread_setspecific( teb_key, teb );
 938 }
 939
 940
 941 /**********************************************************************
 942  *              signal_init_process
 943  */
 944 void signal_init_process(void)
 945 {
 946     struct sigaction sig_act;
 947
 948     sig_act.sa_mask = server_block_set;
 949     sig_act.sa_flags = SA_RESTART | SA_SIGINFO;
 950
 951     sig_act.sa_sigaction = int_handler;
 952     if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
 953     sig_act.sa_sigaction = fpe_handler;
 954     if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
 955     sig_act.sa_sigaction = abrt_handler;
 956     if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
 957     sig_act.sa_sigaction = quit_handler;
 958     if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
 959     sig_act.sa_sigaction = usr1_handler;
 960     if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
 961
 962     sig_act.sa_sigaction = segv_handler;
 963     if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
 964     if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
 965 #ifdef SIGBUS
 966     if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
 967 #endif
 968
 969 #ifdef SIGTRAP
 970     sig_act.sa_sigaction = trap_handler;
 971     if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
 972 #endif
 973     return;
 974
 975  error:
 976     perror("sigaction");
 977     exit(1);
 978 }
 979
 980
 981 /**********************************************************************
 982  *              __wine_enter_vm86   (NTDLL.@)
 983  */
 984 void __wine_enter_vm86( CONTEXT *context )
 985 {
 986     MESSAGE("vm86 mode not supported on this platform\n");
 987 }
 988
 989
 990 /**********************************************************************
 991  *              RtlAddFunctionTable   (NTDLL.@)
 992  */
 993 BOOLEAN CDECL RtlAddFunctionTable( RUNTIME_FUNCTION *table, DWORD count, DWORD addr )
 994 {
 995     FIXME( "%p %u %x: stub\n", table, count, addr );
 996     return TRUE;
 997 }
 998
 999
1000 /**********************************************************************
1001  *              RtlDeleteFunctionTable   (NTDLL.@)
1002  */
1003 BOOLEAN CDECL RtlDeleteFunctionTable( RUNTIME_FUNCTION *table )
1004 {
1005     FIXME( "%p: stub\n", table );
1006     return TRUE;
1007 }
1008
1009 /**********************************************************************
1010  *              find_function_info
1011  */
1012 static RUNTIME_FUNCTION *find_function_info( ULONG_PTR pc, HMODULE module,
1013                                              RUNTIME_FUNCTION *func, ULONG size )
1014 {
1015     int min = 0;
1016     int max = size/sizeof(*func) - 1;
1017
1018     while (min <= max)
1019     {
1020         int pos = (min + max) / 2;
1021         DWORD begin = (func[pos].BeginAddress & ~1), end;
1022         if (func[pos].u.s.Flag)
1023             end = begin + func[pos].u.s.FunctionLength * 2;
1024         else
1025         {
1026             struct UNWIND_INFO *info;
1027             info = (struct UNWIND_INFO *)((char *)module + func[pos].u.UnwindData);
1028             end = begin + info->function_length * 2;
1029         }
1030
1031         if ((char *)pc < (char *)module + begin) max = pos - 1;
1032         else if ((char *)pc >= (char *)module + end) min = pos + 1;
1033         else return func + pos;
1034     }
1035     return NULL;
1036 }
1037
1038 /**********************************************************************
1039  *              RtlLookupFunctionEntry   (NTDLL.@)
1040  */
1041 PRUNTIME_FUNCTION WINAPI RtlLookupFunctionEntry( ULONG_PTR pc, DWORD *base,
1042                                                  UNWIND_HISTORY_TABLE *table )
1043 {
1044     LDR_MODULE *module;
1045     RUNTIME_FUNCTION *func;
1046     ULONG size;
1047
1048     /* FIXME: should use the history table to make things faster */
1049
1050     if (LdrFindEntryForAddress( (void *)pc, &module ))
1051     {
1052         WARN( "module not found for %lx\n", pc );
1053         return NULL;
1054     }
1055     if (!(func = RtlImageDirectoryEntryToData( module->BaseAddress, TRUE,
1056                                                IMAGE_DIRECTORY_ENTRY_EXCEPTION, &size )))
1057     {
1058         WARN( "no exception table found in module %p pc %lx\n", module->BaseAddress, pc );
1059         return NULL;
1060     }
1061     func = find_function_info( pc, module->BaseAddress, func, size );
1062     if (func) *base = (DWORD)module->BaseAddress;
1063     return func;
1064 }
1065
1066 /***********************************************************************
1067  *            RtlUnwind  (NTDLL.@)
1068  */
1069 void WINAPI RtlUnwind( void *endframe, void *target_ip, EXCEPTION_RECORD *rec, void *retval )
1070 {
1071     CONTEXT context;
1072     EXCEPTION_RECORD record;
1073     EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
1074     DWORD res;
1075
1076     RtlCaptureContext( &context );
1077     context.R0 = (DWORD)retval;
1078
1079     /* build an exception record, if we do not have one */
1080     if (!rec)
1081     {
1082         record.ExceptionCode    = STATUS_UNWIND;
1083         record.ExceptionFlags   = 0;
1084         record.ExceptionRecord  = NULL;
1085         record.ExceptionAddress = (void *)context.Pc;
1086         record.NumberParameters = 0;
1087         rec = &record;
1088     }
1089
1090     rec->ExceptionFlags |= EH_UNWINDING | (endframe ? 0 : EH_EXIT_UNWIND);
1091
1092     TRACE( "code=%x flags=%x\n", rec->ExceptionCode, rec->ExceptionFlags );
1093
1094     /* get chain of exception frames */
1095     frame = NtCurrentTeb()->Tib.ExceptionList;
1096     while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != endframe))
1097     {
1098         /* Check frame address */
1099         if (endframe && ((void*)frame > endframe))
1100             raise_status( STATUS_INVALID_UNWIND_TARGET, rec );
1101
1102         if (!is_valid_frame( frame )) raise_status( STATUS_BAD_STACK, rec );
1103
1104         /* Call handler */
1105         TRACE( "calling handler at %p code=%x flags=%x\n",
1106                frame->Handler, rec->ExceptionCode, rec->ExceptionFlags );
1107         res = frame->Handler(rec, frame, &context, &dispatch);
1108         TRACE( "handler at %p returned %x\n", frame->Handler, res );
1109
1110         switch(res)
1111         {
1112         case ExceptionContinueSearch:
1113             break;
1114         case ExceptionCollidedUnwind:
1115             frame = dispatch;
1116             break;
1117         default:
1118             raise_status( STATUS_INVALID_DISPOSITION, rec );
1119             break;
1120         }
1121         frame = __wine_pop_frame( frame );
1122     }
1123 }
1124
1125 /*******************************************************************
1126  *              NtRaiseException (NTDLL.@)
1127  */
1128 NTSTATUS WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
1129 {
1130     NTSTATUS status = raise_exception( rec, context, first_chance );
1131     if (status == STATUS_SUCCESS) NtSetContextThread( GetCurrentThread(), context );
1132     return status;
1133 }
1134
1135 /***********************************************************************
1136  *              RtlRaiseException (NTDLL.@)
1137  */
1138 void WINAPI RtlRaiseException( EXCEPTION_RECORD *rec )
1139 {
1140     CONTEXT context;
1141     NTSTATUS status;
1142
1143     RtlCaptureContext( &context );
1144     rec->ExceptionAddress = (LPVOID)context.Pc;
1145     status = raise_exception( rec, &context, TRUE );
1146     if (status) raise_status( status, rec );
1147 }
1148
1149 /*************************************************************************
1150  *             RtlCaptureStackBackTrace (NTDLL.@)
1151  */
1152 USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer, ULONG *hash )
1153 {
1154     FIXME( "(%d, %d, %p, %p) stub!\n", skip, count, buffer, hash );
1155     return 0;
1156 }
1157
1158 /***********************************************************************
1159  *           call_thread_entry_point
1160  */
1161 void call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg )
1162 {
1163     __TRY
1164     {
1165         exit_thread( entry( arg ));
1166     }
1167     __EXCEPT(unhandled_exception_filter)
1168     {
1169         NtTerminateThread( GetCurrentThread(), GetExceptionCode() );
1170     }
1171     __ENDTRY
1172     abort();  /* should not be reached */
1173 }
1174
1175 /***********************************************************************
1176  *           RtlExitUserThread  (NTDLL.@)
1177  */
1178 void WINAPI RtlExitUserThread( ULONG status )
1179 {
1180     exit_thread( status );
1181 }
1182
1183 /***********************************************************************
1184  *           abort_thread
1185  */
1186 void abort_thread( int status )
1187 {
1188     terminate_thread( status );
1189 }
1190
1191 /**********************************************************************
1192  *              DbgBreakPoint   (NTDLL.@)
1193  */
1194 void WINAPI DbgBreakPoint(void)
1195 {
1196      kill(getpid(), SIGTRAP);
1197 }
1198
1199 /**********************************************************************
1200  *              DbgUserBreakPoint   (NTDLL.@)
1201  */
1202 void WINAPI DbgUserBreakPoint(void)
1203 {
1204      kill(getpid(), SIGTRAP);
1205 }
1206
1207 /**********************************************************************
1208  *           NtCurrentTeb   (NTDLL.@)
1209  */
1210 TEB * WINAPI NtCurrentTeb(void)
1211 {
1212     return pthread_getspecific( teb_key );
1213 }
1214
1215 #endif  /* __arm__ */