ntdll: Add ARM64 signal handling.

dlls/ntdll/Makefile.in

@@ -38,6 +38,7 @@ C_SRCS = \
 	serial.c \
 	server.c \
 	signal_arm.c \
+	signal_arm64.c \
 	signal_i386.c \
 	signal_powerpc.c \
 	signal_sparc.c \

dlls/ntdll/ntdll.spec

@@ -145,7 +145,7 @@
 @ stdcall NtCreateTimer(ptr long ptr long)
 @ stub NtCreateToken
 # @ stub NtCreateWaitablePort
-@ stdcall -arch=win32 NtCurrentTeb()
+@ stdcall -arch=win32,arm64 NtCurrentTeb()
 # @ stub NtDebugActiveProcess
 # @ stub NtDebugContinue
 @ stdcall NtDelayExecution(long ptr)

dlls/ntdll/signal_arm64.c

+/*
+ * ARM64 signal handling routines
+ *
+ * Copyright 2010-2013 André Hentschel
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#ifdef __aarch64__
+
+#include "config.h"
+#include "wine/port.h"
+
+#include <assert.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <stdio.h>
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#ifdef HAVE_SYS_PARAM_H
+# include <sys/param.h>
+#endif
+#ifdef HAVE_SYSCALL_H
+# include <syscall.h>
+#else
+# ifdef HAVE_SYS_SYSCALL_H
+#  include <sys/syscall.h>
+# endif
+#endif
+#ifdef HAVE_SYS_SIGNAL_H
+# include <sys/signal.h>
+#endif
+
+#include "ntstatus.h"
+#define WIN32_NO_STATUS
+#include "windef.h"
+#include "winternl.h"
+#include "wine/library.h"
+#include "wine/exception.h"
+#include "ntdll_misc.h"
+#include "wine/debug.h"
+#include "winnt.h"
+
+WINE_DEFAULT_DEBUG_CHANNEL(seh);
+
+static pthread_key_t teb_key;
+
+/***********************************************************************
+ * signal context platform-specific definitions
+ */
+#ifdef linux
+
+typedef ucontext_t SIGCONTEXT;
+
+/* All Registers access - only for local access */
+# define REG_sig(reg_name, context) ((context)->uc_mcontext.reg_name)
+# define REGn_sig(reg_num, context) ((context)->uc_mcontext.regs[reg_num])
+
+/* Special Registers access  */
+# define SP_sig(context)            REG_sig(sp, context)    /* Stack pointer */
+# define PC_sig(context)            REG_sig(pc, context)    /* Program counter */
+# define PSTATE_sig(context)        REG_sig(pstate, context) /* Current State Register */
+# define FP_sig(context)            REGn_sig(29, context)    /* Frame pointer */
+# define LR_sig(context)            REGn_sig(30, context)    /* Link Register */
+
+/* Exceptions */
+# define FAULT_sig(context)         REG_sig(fault_address, context)
+
+#endif /* linux */
+
+static const size_t teb_size = 0x2000;  /* we reserve two pages for the TEB */
+static size_t signal_stack_size;
+
+typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
+typedef int (*wine_signal_handler)(unsigned int sig);
+
+static wine_signal_handler handlers[256];
+
+/***********************************************************************
+ *           dispatch_signal
+ */
+static inline int dispatch_signal(unsigned int sig)
+{
+    if (handlers[sig] == NULL) return 0;
+    return handlers[sig](sig);
+}
+
+/*******************************************************************
+ *         is_valid_frame
+ */
+static inline BOOL is_valid_frame( void *frame )
+{
+    if ((ULONG_PTR)frame & 3) return FALSE;
+    return (frame >= NtCurrentTeb()->Tib.StackLimit &&
+            (void **)frame < (void **)NtCurrentTeb()->Tib.StackBase - 1);
+}
+
+/***********************************************************************
+ *           save_context
+ *
+ * Set the register values from a sigcontext.
+ */
+static void save_context( CONTEXT *context, const ucontext_t *sigcontext )
+{
+#define C(n) context->X##n = REGn_sig(n,sigcontext)
+    /* Save normal registers */
+    C(0); C(1); C(2); C(3); C(4); C(5); C(6); C(7); C(8); C(9);
+    C(10); C(11); C(12); C(13); C(14); C(15); C(16); C(17); C(18); C(19);
+    C(20); C(21); C(22); C(23); C(24); C(25); C(26); C(27); C(28); C(29); C(30);
+#undef C
+
+    context->ContextFlags = CONTEXT_FULL;
+    context->Sp     = SP_sig(sigcontext);     /* Stack pointer */
+    context->Pc     = PC_sig(sigcontext);     /* Program Counter */
+    context->PState = PSTATE_sig(sigcontext); /* Current State Register */
+}
+
+
+/***********************************************************************
+ *           restore_context
+ *
+ * Build a sigcontext from the register values.
+ */
+static void restore_context( const CONTEXT *context, ucontext_t *sigcontext )
+{
+#define C(n)  REGn_sig(n,sigcontext) = context->X##n
+    /* Restore normal registers */
+    C(0); C(1); C(2); C(3); C(4); C(5); C(6); C(7); C(8); C(9);
+    C(10); C(11); C(12); C(13); C(14); C(15); C(16); C(17); C(18); C(19);
+    C(20); C(21); C(22); C(23); C(24); C(25); C(26); C(27); C(28); C(29); C(30);
+#undef C
+
+    SP_sig(sigcontext)     = context->Sp;     /* Stack pointer */
+    PC_sig(sigcontext)     = context->Pc;     /* Program Counter */
+    PSTATE_sig(sigcontext) = context->PState; /* Current State Register */
+}
+
+
+/***********************************************************************
+ *           save_fpu
+ *
+ * Set the FPU context from a sigcontext.
+ */
+static inline void save_fpu( CONTEXT *context, const ucontext_t *sigcontext )
+{
+    FIXME( "Not implemented on ARM64\n" );
+}
+
+
+/***********************************************************************
+ *           restore_fpu
+ *
+ * Restore the FPU context to a sigcontext.
+ */
+static inline void restore_fpu( CONTEXT *context, const ucontext_t *sigcontext )
+{
+    FIXME( "Not implemented on ARM64\n" );
+}
+
+/***********************************************************************
+ *		RtlCaptureContext (NTDLL.@)
+ */
+void WINAPI RtlCaptureContext( CONTEXT *context )
+{
+    FIXME( "Not implemented on ARM64\n" );
+    memset( context, 0, sizeof(*context) );
+}
+
+/***********************************************************************
+ *           set_cpu_context
+ *
+ * Set the new CPU context.
+ */
+void set_cpu_context( const CONTEXT *context )
+{
+    FIXME( "Not implemented on ARM64\n" );
+}
+
+/***********************************************************************
+ *           copy_context
+ *
+ * Copy a register context according to the flags.
+ */
+void copy_context( CONTEXT *to, const CONTEXT *from, DWORD flags )
+{
+    flags &= ~CONTEXT_ARM64;  /* get rid of CPU id */
+    if (flags & CONTEXT_CONTROL)
+    {
+        to->Sp      = from->Sp;
+        to->Pc      = from->Pc;
+        to->PState  = from->PState;
+    }
+    if (flags & CONTEXT_INTEGER)
+    {
+#define C(n)  to->X##n = from->X##n
+    /* Restore normal registers */
+    C(0); C(1); C(2); C(3); C(4); C(5); C(6); C(7); C(8); C(9);
+    C(10); C(11); C(12); C(13); C(14); C(15); C(16); C(17); C(18); C(19);
+    C(20); C(21); C(22); C(23); C(24); C(25); C(26); C(27); C(28); C(29); C(30);
+#undef C
+    }
+}
+
+/***********************************************************************
+ *           context_to_server
+ *
+ * Convert a register context to the server format.
+ */
+NTSTATUS context_to_server( context_t *to, const CONTEXT *from )
+{
+    DWORD flags = from->ContextFlags & ~CONTEXT_ARM64;  /* get rid of CPU id */
+
+    memset( to, 0, sizeof(*to) );
+    to->cpu = CPU_ARM64;
+
+    if (flags & CONTEXT_CONTROL)
+    {
+        to->flags |= SERVER_CTX_CONTROL;
+        to->ctl.arm64_regs.sp     = from->Sp;
+        to->ctl.arm64_regs.pc     = from->Pc;
+        to->ctl.arm64_regs.pstate = from->PState;
+    }
+    if (flags & CONTEXT_INTEGER)
+    {
+        to->flags |= SERVER_CTX_INTEGER;
+#define C(n)  to->integer.arm64_regs.x[n] = from->X##n
+    /* Restore normal registers */
+    C(0); C(1); C(2); C(3); C(4); C(5); C(6); C(7); C(8); C(9);
+    C(10); C(11); C(12); C(13); C(14); C(15); C(16); C(17); C(18); C(19);
+    C(20); C(21); C(22); C(23); C(24); C(25); C(26); C(27); C(28); C(29); C(30);
+#undef C
+    }
+    return STATUS_SUCCESS;
+}
+
+
+/***********************************************************************
+ *           context_from_server
+ *
+ * Convert a register context from the server format.
+ */
+NTSTATUS context_from_server( CONTEXT *to, const context_t *from )
+{
+    if (from->cpu != CPU_ARM64) return STATUS_INVALID_PARAMETER;
+
+    to->ContextFlags = CONTEXT_ARM64;
+    if (from->flags & SERVER_CTX_CONTROL)
+    {
+        to->ContextFlags |= CONTEXT_CONTROL;
+        to->Sp     = from->ctl.arm64_regs.sp;
+        to->Pc     = from->ctl.arm64_regs.pc;
+        to->PState = from->ctl.arm64_regs.pstate;
+    }
+    if (from->flags & SERVER_CTX_INTEGER)
+    {
+        to->ContextFlags |= CONTEXT_INTEGER;
+#define C(n)  to->X##n = from->integer.arm64_regs.x[n]
+    /* Restore normal registers */
+    C(0); C(1); C(2); C(3); C(4); C(5); C(6); C(7); C(8); C(9);
+    C(10); C(11); C(12); C(13); C(14); C(15); C(16); C(17); C(18); C(19);
+    C(20); C(21); C(22); C(23); C(24); C(25); C(26); C(27); C(28); C(29); C(30);
+#undef C
+     }
+    return STATUS_SUCCESS;
+}
+
+/***********************************************************************
+ *           setup_exception_record
+ *
+ * Setup the exception record and context on the thread stack.
+ */
+static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
+{
+    struct stack_layout
+    {
+        CONTEXT           context;
+        EXCEPTION_RECORD  rec;
+    } *stack;
+    DWORD exception_code = 0;
+
+    stack = (struct stack_layout *)(SP_sig(sigcontext) & ~3);
+    stack--;  /* push the stack_layout structure */
+
+    stack->rec.ExceptionRecord  = NULL;
+    stack->rec.ExceptionCode    = exception_code;
+    stack->rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
+    stack->rec.ExceptionAddress = (LPVOID)PC_sig(sigcontext);
+    stack->rec.NumberParameters = 0;
+
+    save_context( &stack->context, sigcontext );
+
+    /* now modify the sigcontext to return to the raise function */
+    SP_sig(sigcontext) = (ULONG_PTR)stack;
+    PC_sig(sigcontext) = (ULONG_PTR)func;
+    REGn_sig(0, sigcontext) = (ULONG_PTR)&stack->rec;  /* first arg for raise_func */
+    REGn_sig(1, sigcontext) = (ULONG_PTR)&stack->context; /* second arg for raise_func */
+
+    return &stack->rec;
+}
+
+/**********************************************************************
+ *		raise_segv_exception
+ */
+static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
+{
+    NTSTATUS status;
+
+    switch(rec->ExceptionCode)
+    {
+    case EXCEPTION_ACCESS_VIOLATION:
+        if (rec->NumberParameters == 2)
+        {
+            if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
+                                                             rec->ExceptionInformation[0] )))
+                goto done;
+        }
+        break;
+    }
+    status = NtRaiseException( rec, context, TRUE );
+    if (status) raise_status( status, rec );
+done:
+    set_cpu_context( context );
+}
+
+/**********************************************************************
+ *           call_stack_handlers
+ *
+ * Call the stack handlers chain.
+ */
+static NTSTATUS call_stack_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
+{
+    EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
+    DWORD res;
+
+    frame = NtCurrentTeb()->Tib.ExceptionList;
+    nested_frame = NULL;
+    while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
+    {
+        /* Check frame address */
+        if (!is_valid_frame( frame ))
+        {
+            rec->ExceptionFlags |= EH_STACK_INVALID;
+            break;
+        }
+
+        /* Call handler */
+        TRACE( "calling handler at %p code=%x flags=%x\n",
+               frame->Handler, rec->ExceptionCode, rec->ExceptionFlags );
+        res = frame->Handler( rec, frame, context, &dispatch );
+        TRACE( "handler at %p returned %x\n", frame->Handler, res );
+
+        if (frame == nested_frame)
+        {
+            /* no longer nested */
+            nested_frame = NULL;
+            rec->ExceptionFlags &= ~EH_NESTED_CALL;
+        }
+
+        switch(res)
+        {
+        case ExceptionContinueExecution:
+            if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return STATUS_SUCCESS;
+            return STATUS_NONCONTINUABLE_EXCEPTION;
+        case ExceptionContinueSearch:
+            break;
+        case ExceptionNestedException:
+            if (nested_frame < dispatch) nested_frame = dispatch;
+            rec->ExceptionFlags |= EH_NESTED_CALL;
+            break;
+        default:
+            return STATUS_INVALID_DISPOSITION;
+        }
+        frame = frame->Prev;
+    }
+    return STATUS_UNHANDLED_EXCEPTION;
+}
+
+
+/*******************************************************************
+ *		raise_exception
+ *
+ * Implementation of NtRaiseException.
+ */
+static NTSTATUS raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
+{
+    NTSTATUS status;
+
+    if (first_chance)
+    {
+        DWORD c;
+
+        for (c = 0; c < rec->NumberParameters; c++)
+            TRACE( " info[%d]=%016lx\n", c, rec->ExceptionInformation[c] );
+        if (rec->ExceptionCode == EXCEPTION_WINE_STUB)
+        {
+            if (rec->ExceptionInformation[1] >> 16)
+                MESSAGE( "wine: Call from %p to unimplemented function %s.%s, aborting\n",
+                         rec->ExceptionAddress,
+                         (char*)rec->ExceptionInformation[0], (char*)rec->ExceptionInformation[1] );
+            else
+                MESSAGE( "wine: Call from %p to unimplemented function %s.%ld, aborting\n",
+                         rec->ExceptionAddress,
+                         (char*)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
+        }
+        else
+        {
+            /* FIXME: dump context */
+        }
+
+        status = send_debug_event( rec, TRUE, context );
+        if (status == DBG_CONTINUE || status == DBG_EXCEPTION_HANDLED)
+            return STATUS_SUCCESS;
+
+        if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION)
+            return STATUS_SUCCESS;
+
+        if ((status = call_stack_handlers( rec, context )) != STATUS_UNHANDLED_EXCEPTION)
+            return status;
+    }
+
+    /* last chance exception */
+
+    status = send_debug_event( rec, FALSE, context );
+    if (status != DBG_CONTINUE)
+    {
+        if (rec->ExceptionFlags & EH_STACK_INVALID)
+            ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
+        else if (rec->ExceptionCode == STATUS_NONCONTINUABLE_EXCEPTION)
+            ERR("Process attempted to continue execution after noncontinuable exception.\n");
+        else
+            ERR("Unhandled exception code %x flags %x addr %p\n",
+                rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
+        NtTerminateProcess( NtCurrentProcess(), rec->ExceptionCode );
+    }
+    return STATUS_SUCCESS;
+}
+
+/**********************************************************************
+ *		segv_handler
+ *
+ * Handler for SIGSEGV and related errors.
+ */
+static void segv_handler( int signal, siginfo_t *info, void *ucontext )
+{
+    EXCEPTION_RECORD *rec;
+    SIGCONTEXT *context = ucontext;
+
+    /* check for page fault inside the thread stack */
+    if (signal == SIGSEGV &&
+        (char *)info->si_addr >= (char *)NtCurrentTeb()->DeallocationStack &&
+        (char *)info->si_addr < (char *)NtCurrentTeb()->Tib.StackBase &&
+        virtual_handle_stack_fault( info->si_addr ))
+    {
+        /* check if this was the last guard page */
+        if ((char *)info->si_addr < (char *)NtCurrentTeb()->DeallocationStack + 2*4096)
+        {
+            rec = setup_exception( context, raise_segv_exception );
+            rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
+        }
+        return;
+    }
+
+    rec = setup_exception( context, raise_segv_exception );
+    if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return;
+
+    switch(signal)
+    {
+    case SIGILL:   /* Invalid opcode exception */
+        rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
+        break;
+    case SIGSEGV:  /* Segmentation fault */
+        rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
+        rec->NumberParameters = 2;
+        /* FIXME: Currently the kernel provides no way to determine if it's read or write */
+        rec->ExceptionInformation[0] = 0;
+        rec->ExceptionInformation[1] = (ULONG_PTR)info->si_addr;
+        break;
+    case SIGBUS:  /* Alignment check exception */
+        rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
+        break;
+    default:
+        ERR("Got unexpected signal %i\n", signal);
+        rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
+        break;
+    }
+}
+
+/**********************************************************************
+ *		trap_handler
+ *
+ * Handler for SIGTRAP.
+ */
+static void trap_handler( int signal, siginfo_t *info, void *ucontext )
+{
+    EXCEPTION_RECORD rec;
+    CONTEXT context;
+    NTSTATUS status;
+
+    switch ( info->si_code )
+    {
+    case TRAP_TRACE:
+        rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
+        break;
+    case TRAP_BRKPT:
+    default:
+        rec.ExceptionCode = EXCEPTION_BREAKPOINT;
+        break;
+    }
+
+    save_context( &context, ucontext );
+    rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
+    rec.ExceptionRecord  = NULL;
+    rec.ExceptionAddress = (LPVOID)context.Pc;
+    rec.NumberParameters = 0;
+    status = raise_exception( &rec, &context, TRUE );
+    if (status) raise_status( status, &rec );
+    restore_context( &context, ucontext );
+}
+
+/**********************************************************************
+ *		fpe_handler
+ *
+ * Handler for SIGFPE.
+ */
+static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
+{
+    EXCEPTION_RECORD rec;
+    CONTEXT context;
+    NTSTATUS status;
+
+    save_fpu( &context, sigcontext );
+    save_context( &context, sigcontext );
+
+    switch (siginfo->si_code & 0xffff )
+    {
+#ifdef FPE_FLTSUB
+    case FPE_FLTSUB:
+        rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
+        break;
+#endif
+#ifdef FPE_INTDIV
+    case FPE_INTDIV:
+        rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
+        break;
+#endif
+#ifdef FPE_INTOVF
+    case FPE_INTOVF:
+        rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
+        break;
+#endif
+#ifdef FPE_FLTDIV
+    case FPE_FLTDIV:
+        rec.ExceptionCode = EXCEPTION_FLT_DIVIDE_BY_ZERO;
+        break;
+#endif
+#ifdef FPE_FLTOVF
+    case FPE_FLTOVF:
+        rec.ExceptionCode = EXCEPTION_FLT_OVERFLOW;
+        break;
+#endif
+#ifdef FPE_FLTUND
+    case FPE_FLTUND:
+        rec.ExceptionCode = EXCEPTION_FLT_UNDERFLOW;
+        break;
+#endif
+#ifdef FPE_FLTRES
+    case FPE_FLTRES:
+        rec.ExceptionCode = EXCEPTION_FLT_INEXACT_RESULT;
+        break;
+#endif
+#ifdef FPE_FLTINV
+    case FPE_FLTINV:
+#endif
+    default:
+        rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
+        break;
+    }
+    rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
+    rec.ExceptionRecord  = NULL;
+    rec.ExceptionAddress = (LPVOID)context.Pc;
+    rec.NumberParameters = 0;
+    status = raise_exception( &rec, &context, TRUE );
+    if (status) raise_status( status, &rec );
+
+    restore_context( &context, sigcontext );
+    restore_fpu( &context, sigcontext );
+}
+
+/**********************************************************************
+ *		int_handler
+ *
+ * Handler for SIGINT.
+ */
+static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
+{
+    if (!dispatch_signal(SIGINT))
+    {
+        EXCEPTION_RECORD rec;
+        CONTEXT context;
+        NTSTATUS status;
+
+        save_context( &context, sigcontext );
+        rec.ExceptionCode    = CONTROL_C_EXIT;
+        rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
+        rec.ExceptionRecord  = NULL;
+        rec.ExceptionAddress = (LPVOID)context.Pc;
+        rec.NumberParameters = 0;
+        status = raise_exception( &rec, &context, TRUE );
+        if (status) raise_status( status, &rec );
+        restore_context( &context, sigcontext );
+    }
+}
+
+
+/**********************************************************************
+ *		abrt_handler
+ *
+ * Handler for SIGABRT.
+ */
+static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
+{
+    EXCEPTION_RECORD rec;
+    CONTEXT context;
+    NTSTATUS status;
+
+    save_context( &context, sigcontext );
+    rec.ExceptionCode    = EXCEPTION_WINE_ASSERTION;
+    rec.ExceptionFlags   = EH_NONCONTINUABLE;
+    rec.ExceptionRecord  = NULL;
+    rec.ExceptionAddress = (LPVOID)context.Pc;
+    rec.NumberParameters = 0;
+    status = raise_exception( &rec, &context, TRUE );
+    if (status) raise_status( status, &rec );
+    restore_context( &context, sigcontext );
+}
+
+
+/**********************************************************************
+ *		quit_handler
+ *
+ * Handler for SIGQUIT.
+ */
+static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
+{
+    abort_thread(0);
+}
+
+
+/**********************************************************************
+ *		usr1_handler
+ *
+ * Handler for SIGUSR1, used to signal a thread that it got suspended.
+ */
+static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
+{
+    CONTEXT context;
+
+    save_context( &context, sigcontext );
+    wait_suspend( &context );
+    restore_context( &context, sigcontext );
+}
+
+
+/***********************************************************************
+ *           __wine_set_signal_handler   (NTDLL.@)
+ */
+int CDECL __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
+{
+    if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
+    if (handlers[sig] != NULL) return -2;
+    handlers[sig] = wsh;
+    return 0;
+}
+
+
+/**********************************************************************
+ *             signal_alloc_thread
+ */
+NTSTATUS signal_alloc_thread( TEB **teb )
+{
+    static size_t sigstack_zero_bits;
+    SIZE_T size;
+    NTSTATUS status;
+
+    if (!sigstack_zero_bits)
+    {
+        size_t min_size = teb_size + max( MINSIGSTKSZ, 8192 );
+        /* find the first power of two not smaller than min_size */
+        sigstack_zero_bits = 12;
+        while ((1u << sigstack_zero_bits) < min_size) sigstack_zero_bits++;
+        signal_stack_size = (1 << sigstack_zero_bits) - teb_size;
+        assert( sizeof(TEB) <= teb_size );
+    }
+
+    size = 1 << sigstack_zero_bits;
+    *teb = NULL;
+    if (!(status = NtAllocateVirtualMemory( NtCurrentProcess(), (void **)teb, sigstack_zero_bits,
+                                            &size, MEM_COMMIT | MEM_TOP_DOWN, PAGE_READWRITE )))
+    {
+        (*teb)->Tib.Self = &(*teb)->Tib;
+        (*teb)->Tib.ExceptionList = (void *)~0UL;
+    }
+    return status;
+}
+
+
+/**********************************************************************
+ *             signal_free_thread
+ */
+void signal_free_thread( TEB *teb )
+{
+    SIZE_T size;
+
+    if (teb->DeallocationStack)
+    {
+        size = 0;
+        NtFreeVirtualMemory( GetCurrentProcess(), &teb->DeallocationStack, &size, MEM_RELEASE );
+    }
+    size = 0;
+    NtFreeVirtualMemory( NtCurrentProcess(), (void **)&teb, &size, MEM_RELEASE );
+}
+
+
+/**********************************************************************
+ *		signal_init_thread
+ */
+void signal_init_thread( TEB *teb )
+{
+    static int init_done;
+
+    if (!init_done)
+    {
+        pthread_key_create( &teb_key, NULL );
+        init_done = 1;
+    }
+    pthread_setspecific( teb_key, teb );
+}
+
+
+/**********************************************************************
+ *		signal_init_process
+ */
+void signal_init_process(void)
+{
+    struct sigaction sig_act;
+
+    sig_act.sa_mask = server_block_set;
+    sig_act.sa_flags = SA_RESTART | SA_SIGINFO;
+
+    sig_act.sa_sigaction = int_handler;
+    if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
+    sig_act.sa_sigaction = fpe_handler;
+    if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
+    sig_act.sa_sigaction = abrt_handler;
+    if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
+    sig_act.sa_sigaction = quit_handler;
+    if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
+    sig_act.sa_sigaction = usr1_handler;
+    if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
+
+    sig_act.sa_sigaction = segv_handler;
+    if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
+    if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
+#ifdef SIGBUS
+    if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
+#endif
+
+#ifdef SIGTRAP
+    sig_act.sa_sigaction = trap_handler;
+    if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
+#endif
+    return;
+
+ error:
+    perror("sigaction");
+    exit(1);
+}
+
+
+/**********************************************************************
+ *              __wine_enter_vm86   (NTDLL.@)
+ */
+void __wine_enter_vm86( CONTEXT *context )
+{
+    MESSAGE("vm86 mode not supported on this platform\n");
+}
+
+/***********************************************************************
+ *            RtlUnwind  (NTDLL.@)
+ */
+void WINAPI RtlUnwind( PVOID pEndFrame, PVOID targetIp, PEXCEPTION_RECORD pRecord, PVOID retval )
+{
+    FIXME( "Not implemented on ARM64\n" );
+}
+
+/*******************************************************************
+ *		NtRaiseException (NTDLL.@)
+ */
+NTSTATUS WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
+{
+    NTSTATUS status = raise_exception( rec, context, first_chance );
+    if (status == STATUS_SUCCESS) NtSetContextThread( GetCurrentThread(), context );
+    return status;
+}
+
+/***********************************************************************
+ *		RtlRaiseException (NTDLL.@)
+ */
+void WINAPI RtlRaiseException( EXCEPTION_RECORD *rec )
+{
+    CONTEXT context;
+    NTSTATUS status;
+
+    RtlCaptureContext( &context );
+    rec->ExceptionAddress = (LPVOID)context.Pc;
+    status = raise_exception( rec, &context, TRUE );
+    if (status) raise_status( status, rec );
+}
+
+/*************************************************************************
+ *             RtlCaptureStackBackTrace (NTDLL.@)
+ */
+USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer, ULONG *hash )
+{
+    FIXME( "(%d, %d, %p, %p) stub!\n", skip, count, buffer, hash );
+    return 0;
+}
+
+/***********************************************************************
+ *           call_thread_entry_point
+ */
+void call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg )
+{
+    __TRY
+    {
+        exit_thread( entry( arg ));
+    }
+    __EXCEPT(unhandled_exception_filter)
+    {
+        NtTerminateThread( GetCurrentThread(), GetExceptionCode() );
+    }
+    __ENDTRY
+    abort();  /* should not be reached */
+}
+
+/***********************************************************************
+ *           RtlExitUserThread  (NTDLL.@)
+ */
+void WINAPI RtlExitUserThread( ULONG status )
+{
+    exit_thread( status );
+}
+
+/***********************************************************************
+ *           abort_thread
+ */
+void abort_thread( int status )
+{
+    terminate_thread( status );
+}
+
+/**********************************************************************
+ *              DbgBreakPoint   (NTDLL.@)
+ */
+void WINAPI DbgBreakPoint(void)
+{
+     kill(getpid(), SIGTRAP);
+}
+
+/**********************************************************************
+ *              DbgUserBreakPoint   (NTDLL.@)
+ */
+void WINAPI DbgUserBreakPoint(void)
+{
+     kill(getpid(), SIGTRAP);
+}
+
+/**********************************************************************
+ *           NtCurrentTeb   (NTDLL.@)
+ */
+TEB * WINAPI NtCurrentTeb(void)
+{
+    return pthread_getspecific( teb_key );
+}
+
+#endif  /* __aarch64__ */