exception.c 36.6 KB
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/*
 * Unit test suite for ntdll exceptions
 *
 * Copyright 2005 Alexandre Julliard
 *
 * 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
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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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 */

#include <stdarg.h>
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#include <stdio.h>
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#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x500 /* For NTSTATUS */
#endif

#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winbase.h"
#include "winnt.h"
#include "winreg.h"
#include "winternl.h"
#include "excpt.h"
#include "wine/test.h"

#ifdef __i386__
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static int      my_argc;
static char**   my_argv;
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static int      test_stage;
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static struct _TEB * (WINAPI *pNtCurrentTeb)(void);
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static NTSTATUS  (WINAPI *pNtGetContextThread)(HANDLE,CONTEXT*);
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static NTSTATUS  (WINAPI *pNtSetContextThread)(HANDLE,CONTEXT*);
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static NTSTATUS  (WINAPI *pRtlRaiseException)(EXCEPTION_RECORD *rec);
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static PVOID     (WINAPI *pRtlAddVectoredExceptionHandler)(ULONG first, PVECTORED_EXCEPTION_HANDLER func);
static ULONG     (WINAPI *pRtlRemoveVectoredExceptionHandler)(PVOID handler);
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static NTSTATUS  (WINAPI *pNtReadVirtualMemory)(HANDLE, const void*, void*, SIZE_T, SIZE_T*);
static NTSTATUS  (WINAPI *pNtTerminateProcess)(HANDLE handle, LONG exit_code);
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static void *code_mem;
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/* Test various instruction combinations that cause a protection fault on the i386,
 * and check what the resulting exception looks like.
 */

static const struct exception
{
    BYTE     code[18];   /* asm code */
    BYTE     offset;     /* offset of faulting instruction */
    BYTE     length;     /* length of faulting instruction */
    NTSTATUS status;     /* expected status code */
    DWORD    nb_params;  /* expected number of parameters */
    DWORD    params[4];  /* expected parameters */
} exceptions[] =
{
    /* test some privileged instructions */
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    { { 0xfb, 0xc3 },  /* sti; ret */
      0, 1, STATUS_PRIVILEGED_INSTRUCTION, 0 },
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    { { 0x6c, 0xc3 },  /* insb (%dx); ret */
      0, 1, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0x6d, 0xc3 },  /* insl (%dx); ret */
      0, 1, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0x6e, 0xc3 },  /* outsb (%dx); ret */
      0, 1, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0x6f, 0xc3 },  /* outsl (%dx); ret */
      0, 1, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0xe4, 0x11, 0xc3 },  /* inb $0x11,%al; ret */
      0, 2, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0xe5, 0x11, 0xc3 },  /* inl $0x11,%eax; ret */
      0, 2, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0xe6, 0x11, 0xc3 },  /* outb %al,$0x11; ret */
      0, 2, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0xe7, 0x11, 0xc3 },  /* outl %eax,$0x11; ret */
      0, 2, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0xed, 0xc3 },  /* inl (%dx),%eax; ret */
      0, 1, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0xee, 0xc3 },  /* outb %al,(%dx); ret */
      0, 1, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0xef, 0xc3 },  /* outl %eax,(%dx); ret */
      0, 1, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0xf4, 0xc3 },  /* hlt; ret */
      0, 1, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0xfa, 0xc3 },  /* cli; ret */
      0, 1, STATUS_PRIVILEGED_INSTRUCTION, 0 },

    /* test long jump to invalid selector */
    { { 0xea, 0, 0, 0, 0, 0, 0, 0xc3 },  /* ljmp $0,$0; ret */
      0, 7, STATUS_ACCESS_VIOLATION, 2, { 0, 0xffffffff } },

    /* test iret to invalid selector */
    { { 0x6a, 0x00, 0x6a, 0x00, 0x6a, 0x00, 0xcf, 0x83, 0xc4, 0x0c, 0xc3 },
      /* pushl $0; pushl $0; pushl $0; iret; addl $12,%esp; ret */
      6, 1, STATUS_ACCESS_VIOLATION, 2, { 0, 0xffffffff } },

    /* test loading an invalid selector */
    { { 0xb8, 0xef, 0xbe, 0x00, 0x00, 0x8e, 0xe8, 0xc3 },  /* mov $beef,%ax; mov %ax,%gs; ret */
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      5, 2, STATUS_ACCESS_VIOLATION, 2, { 0, 0xbee8 } }, /* 0xbee8 or 0xffffffff */
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    /* test accessing a zero selector */
    { { 0x06, 0x31, 0xc0, 0x8e, 0xc0, 0x26, 0xa1, 0, 0, 0, 0, 0x07, 0xc3 },
          /* push %es; xor %eax,%eax; mov %ax,%es; mov %es:(0),%ax; pop %es */
      5, 6, STATUS_ACCESS_VIOLATION, 2, { 0, 0xffffffff } },

    /* test moving %cs -> %ss */
    { { 0x0e, 0x17, 0x58, 0xc3 },  /* pushl %cs; popl %ss; popl %eax; ret */
      1, 1, STATUS_ACCESS_VIOLATION, 2, { 0, 0xffffffff } },

    /* test overlong instruction (limit is 16 bytes) */
    { { 0x64,0x64,0x64,0x64,0x64,0x64,0x64,0x64,0x64,0x64,0x64,0x64,0x64,0x64,0x64,0xfa,0xc3 },
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      0, 16, STATUS_ILLEGAL_INSTRUCTION, 0 },
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    { { 0x64,0x64,0x64,0x64,0x64,0x64,0x64,0x64,0x64,0x64,0x64,0x64,0x64,0x64,0xfa,0xc3 },
      0, 15, STATUS_PRIVILEGED_INSTRUCTION, 0 },

    /* test invalid interrupt */
    { { 0xcd, 0xff, 0xc3 },   /* int $0xff; ret */
      0, 2, STATUS_ACCESS_VIOLATION, 2, { 0, 0xffffffff } },

    /* test moves to/from Crx */
    { { 0x0f, 0x20, 0xc0, 0xc3 },  /* movl %cr0,%eax; ret */
      0, 3, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0x0f, 0x20, 0xe0, 0xc3 },  /* movl %cr4,%eax; ret */
      0, 3, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0x0f, 0x22, 0xc0, 0xc3 },  /* movl %eax,%cr0; ret */
      0, 3, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0x0f, 0x22, 0xe0, 0xc3 },  /* movl %eax,%cr4; ret */
      0, 3, STATUS_PRIVILEGED_INSTRUCTION, 0 },

    /* test moves to/from Drx */
    { { 0x0f, 0x21, 0xc0, 0xc3 },  /* movl %dr0,%eax; ret */
      0, 3, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0x0f, 0x21, 0xc8, 0xc3 },  /* movl %dr1,%eax; ret */
      0, 3, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0x0f, 0x21, 0xf8, 0xc3 },  /* movl %dr7,%eax; ret */
      0, 3, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0x0f, 0x23, 0xc0, 0xc3 },  /* movl %eax,%dr0; ret */
      0, 3, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0x0f, 0x23, 0xc8, 0xc3 },  /* movl %eax,%dr1; ret */
      0, 3, STATUS_PRIVILEGED_INSTRUCTION, 0 },
    { { 0x0f, 0x23, 0xf8, 0xc3 },  /* movl %eax,%dr7; ret */
      0, 3, STATUS_PRIVILEGED_INSTRUCTION, 0 },

    /* test memory reads */
    { { 0xa1, 0xfc, 0xff, 0xff, 0xff, 0xc3 },  /* movl 0xfffffffc,%eax; ret */
      0, 5, STATUS_ACCESS_VIOLATION, 2, { 0, 0xfffffffc } },
    { { 0xa1, 0xfd, 0xff, 0xff, 0xff, 0xc3 },  /* movl 0xfffffffd,%eax; ret */
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      0, 5, STATUS_ACCESS_VIOLATION, 2, { 0, 0xfffffffd } },
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    { { 0xa1, 0xfe, 0xff, 0xff, 0xff, 0xc3 },  /* movl 0xfffffffe,%eax; ret */
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      0, 5, STATUS_ACCESS_VIOLATION, 2, { 0, 0xfffffffe } },
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    { { 0xa1, 0xff, 0xff, 0xff, 0xff, 0xc3 },  /* movl 0xffffffff,%eax; ret */
      0, 5, STATUS_ACCESS_VIOLATION, 2, { 0, 0xffffffff } },

    /* test memory writes */
    { { 0xa3, 0xfc, 0xff, 0xff, 0xff, 0xc3 },  /* movl %eax,0xfffffffc; ret */
      0, 5, STATUS_ACCESS_VIOLATION, 2, { 1, 0xfffffffc } },
    { { 0xa3, 0xfd, 0xff, 0xff, 0xff, 0xc3 },  /* movl %eax,0xfffffffd; ret */
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      0, 5, STATUS_ACCESS_VIOLATION, 2, { 1, 0xfffffffd } },
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    { { 0xa3, 0xfe, 0xff, 0xff, 0xff, 0xc3 },  /* movl %eax,0xfffffffe; ret */
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      0, 5, STATUS_ACCESS_VIOLATION, 2, { 1, 0xfffffffe } },
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    { { 0xa3, 0xff, 0xff, 0xff, 0xff, 0xc3 },  /* movl %eax,0xffffffff; ret */
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      0, 5, STATUS_ACCESS_VIOLATION, 2, { 1, 0xffffffff } },
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    /* test exception with cleared %ds and %es */
    { { 0x1e, 0x06, 0x31, 0xc0, 0x8e, 0xd8, 0x8e, 0xc0, 0xfa, 0x07, 0x1f, 0xc3 },
          /* push %ds; push %es; xorl %eax,%eax; mov %ax,%ds; mov %ax,%es; cli; pop %es; pop %ds; ret */
      8, 1, STATUS_PRIVILEGED_INSTRUCTION, 0 },
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};

static int got_exception;
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static BOOL have_vectored_api;
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static void run_exception_test(void *handler, const void* context,
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                               const void *code, unsigned int code_size)
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{
    struct {
        EXCEPTION_REGISTRATION_RECORD frame;
        const void *context;
    } exc_frame;
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    void (*func)(void) = code_mem;
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    exc_frame.frame.Handler = handler;
    exc_frame.frame.Prev = pNtCurrentTeb()->Tib.ExceptionList;
    exc_frame.context = context;

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    memcpy(code_mem, code, code_size);

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    pNtCurrentTeb()->Tib.ExceptionList = &exc_frame.frame;
    func();
    pNtCurrentTeb()->Tib.ExceptionList = exc_frame.frame.Prev;
}

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LONG CALLBACK rtlraiseexception_vectored_handler(EXCEPTION_POINTERS *ExceptionInfo)
{
    PCONTEXT context = ExceptionInfo->ContextRecord;
    PEXCEPTION_RECORD rec = ExceptionInfo->ExceptionRecord;
    trace("vect. handler %08x addr:%p context.Eip:%x\n", rec->ExceptionCode,
          rec->ExceptionAddress, context->Eip);

    todo_wine {
    ok(rec->ExceptionAddress == (char *)code_mem + 0xb, "ExceptionAddress at %p instead of %p\n",
       rec->ExceptionAddress, (char *)code_mem + 0xb);
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    if (pNtCurrentTeb()->Peb->BeingDebugged)
        ok((void *)context->Eax == pRtlRaiseException, "debugger managed to modify Eax to %x should be %p\n",
           context->Eax, pRtlRaiseException);
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    }

    /* check that context.Eip is fixed up only for EXCEPTION_BREAKPOINT
     * even if raised by RtlRaiseException
     */
    if(rec->ExceptionCode == EXCEPTION_BREAKPOINT)
    {
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        ok(context->Eip == (DWORD)code_mem + 0xa ||
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           broken(context->Eip == (DWORD)code_mem + 0xb), /* win2k3 */
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           "Eip at %x instead of %x or %x\n", context->Eip,
           (DWORD)code_mem + 0xa, (DWORD)code_mem + 0xb);
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    }
    else
    {
        ok(context->Eip == (DWORD)code_mem + 0xb, "Eip at %x instead of %x\n",
           context->Eip, (DWORD)code_mem + 0xb);
    }

    /* test if context change is preserved from vectored handler to stack handlers */
    context->Eax = 0xf00f00f0;
    return EXCEPTION_CONTINUE_SEARCH;
}

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static DWORD rtlraiseexception_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
                      CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
    trace( "exception: %08x flags:%x addr:%p context: Eip:%x\n",
           rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress, context->Eip );

    todo_wine {
    ok(rec->ExceptionAddress == (char *)code_mem + 0xb, "ExceptionAddress at %p instead of %p\n",
       rec->ExceptionAddress, (char *)code_mem + 0xb);
    }

    /* check that context.Eip is fixed up only for EXCEPTION_BREAKPOINT
     * even if raised by RtlRaiseException
     */
    if(rec->ExceptionCode == EXCEPTION_BREAKPOINT)
    {
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        ok(context->Eip == (DWORD)code_mem + 0xa ||
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           broken(context->Eip == (DWORD)code_mem + 0xb), /* win2k3 */
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           "Eip at %x instead of %x or %x\n", context->Eip,
           (DWORD)code_mem + 0xa, (DWORD)code_mem + 0xb);
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    }
    else
    {
        ok(context->Eip == (DWORD)code_mem + 0xb, "Eip at %x instead of %x\n",
           context->Eip, (DWORD)code_mem + 0xb);
    }

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    if(have_vectored_api)
        ok(context->Eax == 0xf00f00f0, "Eax is %x, should have been set to 0xf00f00f0 in vectored handler\n",
           context->Eax);

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    /* give the debugger a chance to examine the state a second time */
    /* without the exception handler changing Eip */
    if (test_stage == 2)
        return ExceptionContinueSearch;

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    /* Eip in context is decreased by 1
     * Increase it again, else execution will continue in the middle of a instruction */
    if(rec->ExceptionCode == EXCEPTION_BREAKPOINT && (context->Eip == (DWORD)code_mem + 0xa))
        context->Eip += 1;
    return ExceptionContinueExecution;
}


static const BYTE call_one_arg_code[] = {
        0x8b, 0x44, 0x24, 0x08, /* mov 0x8(%esp),%eax */
        0x50,                   /* push %eax */
        0x8b, 0x44, 0x24, 0x08, /* mov 0x8(%esp),%eax */
        0xff, 0xd0,             /* call *%eax */
        0x90,                   /* nop */
        0x90,                   /* nop */
        0x90,                   /* nop */
        0x90,                   /* nop */
        0xc3,                   /* ret */
};


static void run_rtlraiseexception_test(DWORD exceptioncode)
{
    EXCEPTION_REGISTRATION_RECORD frame;
    EXCEPTION_RECORD record;
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    PVOID vectored_handler = NULL;
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    void (*func)(void* function, EXCEPTION_RECORD* record) = code_mem;

    record.ExceptionCode = exceptioncode;
    record.ExceptionFlags = 0;
    record.ExceptionRecord = NULL;
    record.ExceptionAddress = NULL; /* does not matter, copied return address */
    record.NumberParameters = 0;

    frame.Handler = rtlraiseexception_handler;
    frame.Prev = pNtCurrentTeb()->Tib.ExceptionList;

    memcpy(code_mem, call_one_arg_code, sizeof(call_one_arg_code));

    pNtCurrentTeb()->Tib.ExceptionList = &frame;
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    if (have_vectored_api)
    {
        vectored_handler = pRtlAddVectoredExceptionHandler(TRUE, &rtlraiseexception_vectored_handler);
        ok(vectored_handler != 0, "RtlAddVectoredExceptionHandler failed\n");
    }

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    func(pRtlRaiseException, &record);
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    if (have_vectored_api)
        pRtlRemoveVectoredExceptionHandler(vectored_handler);
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    pNtCurrentTeb()->Tib.ExceptionList = frame.Prev;
}

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static void test_rtlraiseexception(void)
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{
    if (!pRtlRaiseException)
    {
        skip("RtlRaiseException not found\n");
        return;
    }

    /* test without debugger */
    run_rtlraiseexception_test(0x12345);
    run_rtlraiseexception_test(EXCEPTION_BREAKPOINT);
    run_rtlraiseexception_test(EXCEPTION_INVALID_HANDLE);
}
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static DWORD handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
                      CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
    const struct exception *except = *(const struct exception **)(frame + 1);
    unsigned int i, entry = except - exceptions;

    got_exception++;
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    trace( "exception: %x flags:%x addr:%p\n",
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           rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );

    ok( rec->ExceptionCode == except->status,
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        "%u: Wrong exception code %x/%x\n", entry, rec->ExceptionCode, except->status );
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    ok( rec->ExceptionAddress == (char*)code_mem + except->offset,
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        "%u: Wrong exception address %p/%p\n", entry,
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        rec->ExceptionAddress, (char*)code_mem + except->offset );
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    ok( rec->NumberParameters == except->nb_params,
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        "%u: Wrong number of parameters %u/%u\n", entry, rec->NumberParameters, except->nb_params );
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    /* Most CPUs (except Intel Core apparently) report a segment limit violation */
    /* instead of page faults for accesses beyond 0xffffffff */
    if (except->nb_params == 2 && except->params[1] >= 0xfffffffd)
    {
        if (rec->ExceptionInformation[0] == 0 && rec->ExceptionInformation[1] == 0xffffffff)
            goto skip_params;
    }

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    /* Seems that both 0xbee8 and 0xfffffffff can be returned in windows */
    if (except->nb_params == 2 && rec->NumberParameters == 2
        && except->params[1] == 0xbee8 && rec->ExceptionInformation[1] == 0xffffffff
        && except->params[0] == rec->ExceptionInformation[0])
    {
        goto skip_params;
    }

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    for (i = 0; i < rec->NumberParameters; i++)
        ok( rec->ExceptionInformation[i] == except->params[i],
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            "%u: Wrong parameter %d: %lx/%x\n",
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            entry, i, rec->ExceptionInformation[i], except->params[i] );

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skip_params:
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    /* don't handle exception if it's not the address we expected */
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    if (rec->ExceptionAddress != (char*)code_mem + except->offset) return ExceptionContinueSearch;
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    context->Eip += except->length;
    return ExceptionContinueExecution;
}

static void test_prot_fault(void)
{
    unsigned int i;

    for (i = 0; i < sizeof(exceptions)/sizeof(exceptions[0]); i++)
    {
        got_exception = 0;
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        run_exception_test(handler, &exceptions[i], &exceptions[i].code,
                           sizeof(exceptions[i].code));
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        if (!i && !got_exception)
        {
            trace( "No exception, assuming win9x, no point in testing further\n" );
            break;
        }
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        ok( got_exception == (exceptions[i].status != 0),
            "%u: bad exception count %d\n", i, got_exception );
    }
}

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/* test handling of debug registers */
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static DWORD dreg_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
                      CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
    context->Eip += 2;	/* Skips the popl (%eax) */
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    context->Dr0 = 0x42424242;
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    context->Dr1 = 0;
    context->Dr2 = 0;
    context->Dr3 = 0;
    context->Dr6 = 0;
    context->Dr7 = 0x155;
    return ExceptionContinueExecution;
}

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static const BYTE segfault_code[5] = {
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	0x31, 0xc0, /* xor    %eax,%eax */
	0x8f, 0x00, /* popl   (%eax) - cause exception */
        0xc3        /* ret */
};

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/* test the single step exception behaviour */
static DWORD single_step_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
                                  CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
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    got_exception++;
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    ok (!(context->EFlags & 0x100), "eflags has single stepping bit set\n");
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    if( got_exception < 3)
        context->EFlags |= 0x100;  /* single step until popf instruction */
    else {
        /* show that the last single step exception on the popf instruction
         * (which removed the TF bit), still is a EXCEPTION_SINGLE_STEP exception */
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        ok( rec->ExceptionCode == EXCEPTION_SINGLE_STEP,
            "exception is not EXCEPTION_SINGLE_STEP: %x\n", rec->ExceptionCode);
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    }

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    return ExceptionContinueExecution;
}

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static const BYTE single_stepcode[] = {
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    0x9c,		/* pushf */
    0x58,		/* pop   %eax */
    0x0d,0,1,0,0,	/* or    $0x100,%eax */
    0x50,		/* push   %eax */
    0x9d,		/* popf    */
    0x35,0,1,0,0,	/* xor    $0x100,%eax */
    0x50,		/* push   %eax */
    0x9d,		/* popf    */
    0xc3
};

/* Test the alignment check (AC) flag handling. */
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static const BYTE align_check_code[] = {
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    0x55,                  	/* push   %ebp */
    0x89,0xe5,             	/* mov    %esp,%ebp */
    0x9c,                  	/* pushf   */
    0x58,                  	/* pop    %eax */
    0x0d,0,0,4,0,       	/* or     $0x40000,%eax */
    0x50,                  	/* push   %eax */
    0x9d,                  	/* popf    */
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    0x89,0xe0,                  /* mov %esp, %eax */
    0x8b,0x40,0x1,              /* mov 0x1(%eax), %eax - cause exception */
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    0x9c,                  	/* pushf   */
    0x58,                  	/* pop    %eax */
    0x35,0,0,4,0,       	/* xor    $0x40000,%eax */
    0x50,                  	/* push   %eax */
    0x9d,                  	/* popf    */
    0x5d,                  	/* pop    %ebp */
    0xc3,                  	/* ret     */
};

static DWORD align_check_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
                                  CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
    ok (!(context->EFlags & 0x40000), "eflags has AC bit set\n");
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    got_exception++;
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    return ExceptionContinueExecution;
}

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/* Test the direction flag handling. */
static const BYTE direction_flag_code[] = {
    0x55,                  	/* push   %ebp */
    0x89,0xe5,             	/* mov    %esp,%ebp */
    0xfd,                  	/* std */
    0xfa,                  	/* cli - cause exception */
    0x5d,                  	/* pop    %ebp */
    0xc3,                  	/* ret     */
};

static DWORD direction_flag_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
                                     CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
#ifdef __GNUC__
    unsigned int flags;
    __asm__("pushfl; popl %0" : "=r" (flags) );
505 506
    /* older windows versions don't clear DF properly so don't test */
    if (flags & 0x400) trace( "eflags has DF bit set\n" );
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#endif
    ok( context->EFlags & 0x400, "context eflags has DF bit cleared\n" );
    got_exception++;
    context->Eip++;  /* skip cli */
511
    context->EFlags &= ~0x400;  /* make sure it is cleared on return */
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    return ExceptionContinueExecution;
}

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/* test single stepping over hardware breakpoint */
static DWORD bpx_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
                          CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
    got_exception++;
    ok( rec->ExceptionCode == EXCEPTION_SINGLE_STEP,
        "wrong exception code: %x\n", rec->ExceptionCode);

    if(got_exception == 1) {
        /* hw bp exception on first nop */
        ok( context->Eip == (DWORD)code_mem, "eip is wrong:  %x instead of %x\n",
                                             context->Eip, (DWORD)code_mem);
        ok( (context->Dr6 & 0xf) == 1, "B0 flag is not set in Dr6\n");
        ok( !(context->Dr6 & 0x4000), "BS flag is set in Dr6\n");
        context->Dr0 = context->Dr0 + 1;  /* set hw bp again on next instruction */
        context->EFlags |= 0x100;       /* enable single stepping */
    } else if(  got_exception == 2) {
        /* single step exception on second nop */
        ok( context->Eip == (DWORD)code_mem + 1, "eip is wrong: %x instead of %x\n",
                                                 context->Eip, (DWORD)code_mem + 1);
535
        ok( (context->Dr6 & 0x4000), "BS flag is not set in Dr6\n");
536 537
       /* depending on the win version the B0 bit is already set here as well
        ok( (context->Dr6 & 0xf) == 0, "B0...3 flags in Dr6 shouldn't be set\n"); */
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        context->EFlags |= 0x100;
    } else if( got_exception == 3) {
        /* hw bp exception on second nop */
        ok( context->Eip == (DWORD)code_mem + 1, "eip is wrong: %x instead of %x\n",
                                                 context->Eip, (DWORD)code_mem + 1);
543
        ok( (context->Dr6 & 0xf) == 1, "B0 flag is not set in Dr6\n");
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        ok( !(context->Dr6 & 0x4000), "BS flag is set in Dr6\n");
        context->Dr0 = 0;       /* clear breakpoint */
        context->EFlags |= 0x100;
    } else {
        /* single step exception on ret */
        ok( context->Eip == (DWORD)code_mem + 2, "eip is wrong: %x instead of %x\n",
                                                 context->Eip, (DWORD)code_mem + 2);
        ok( (context->Dr6 & 0xf) == 0, "B0...3 flags in Dr6 shouldn't be set\n");
552
        ok( (context->Dr6 & 0x4000), "BS flag is not set in Dr6\n");
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    }

    context->Dr6 = 0;  /* clear status register */
    return ExceptionContinueExecution;
}

static const BYTE dummy_code[] = { 0x90, 0x90, 0xc3 };  /* nop, nop, ret */

/* test int3 handling */
static DWORD int3_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
                           CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
    ok( rec->ExceptionAddress == code_mem, "exception address not at: %p, but at %p\n",
                                           code_mem,  rec->ExceptionAddress);
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    ok( context->Eip == (DWORD)code_mem, "eip not at: %p, but at %#x\n", code_mem, context->Eip);
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    if(context->Eip == (DWORD)code_mem) context->Eip++; /* skip breakpoint */

    return ExceptionContinueExecution;
}

static const BYTE int3_code[] = { 0xCC, 0xc3 };  /* int 3, ret */


576
static void test_exceptions(void)
577
{
578 579
    CONTEXT ctx;
    NTSTATUS res;
580

581
    if (!pNtGetContextThread || !pNtSetContextThread)
582
    {
583
        skip( "NtGetContextThread/NtSetContextThread not found\n" );
584 585 586
        return;
    }

587
    /* test handling of debug registers */
588
    run_exception_test(dreg_handler, NULL, &segfault_code, sizeof(segfault_code));
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    ctx.ContextFlags = CONTEXT_DEBUG_REGISTERS;
    res = pNtGetContextThread(GetCurrentThread(), &ctx);
    ok (res == STATUS_SUCCESS,"NtGetContextThread failed with %x\n", res);
    ok(ctx.Dr0 == 0x42424242,"failed to set debugregister 0 to 0x42424242, got %x\n", ctx.Dr0);
594
    ok((ctx.Dr7 & ~0xdc00) == 0x155,"failed to set debugregister 7 to 0x155, got %x\n", ctx.Dr7);
595 596 597

    /* test single stepping behavior */
    got_exception = 0;
598
    run_exception_test(single_step_handler, NULL, &single_stepcode, sizeof(single_stepcode));
599
    ok(got_exception == 3, "expected 3 single step exceptions, got %d\n", got_exception);
600 601 602

    /* test alignment exceptions */
    got_exception = 0;
603
    run_exception_test(align_check_handler, NULL, align_check_code, sizeof(align_check_code));
604
    ok(got_exception == 0, "got %d alignment faults, expected 0\n", got_exception);
605

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    /* test direction flag */
    got_exception = 0;
    run_exception_test(direction_flag_handler, NULL, direction_flag_code, sizeof(direction_flag_code));
    ok(got_exception == 1, "got %d exceptions, expected 1\n", got_exception);

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    /* test single stepping over hardware breakpoint */
    memset(&ctx, 0, sizeof(ctx));
    ctx.Dr0 = (DWORD) code_mem;  /* set hw bp on first nop */
    ctx.Dr7 = 3;
    ctx.ContextFlags = CONTEXT_DEBUG_REGISTERS;
    res = pNtSetContextThread( GetCurrentThread(), &ctx);
    ok( res == STATUS_SUCCESS, "NtSetContextThread faild with %x\n", res);

    got_exception = 0;
    run_exception_test(bpx_handler, NULL, dummy_code, sizeof(dummy_code));
    ok( got_exception == 4,"expected 4 exceptions, got %d\n", got_exception);

    /* test int3 handling */
    run_exception_test(int3_handler, NULL, int3_code, sizeof(int3_code));
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}

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static void test_debugger(void)
{
    char cmdline[MAX_PATH];
    PROCESS_INFORMATION pi;
    STARTUPINFO si = { 0 };
    DEBUG_EVENT de;
    DWORD continuestatus;
    PVOID code_mem_address = NULL;
    NTSTATUS status;
    SIZE_T size_read;
637
    BOOL ret;
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    int counter = 0;
    si.cb = sizeof(si);

    if(!pNtGetContextThread || !pNtSetContextThread || !pNtReadVirtualMemory || !pNtTerminateProcess)
    {
        skip("NtGetContextThread, NtSetContextThread, NtReadVirtualMemory or NtTerminateProcess not found\n)");
        return;
    }

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    sprintf(cmdline, "%s %s %s %p", my_argv[0], my_argv[1], "debuggee", &test_stage);
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    ret = CreateProcess(NULL, cmdline, NULL, NULL, FALSE, DEBUG_PROCESS, NULL, NULL, &si, &pi);
    ok(ret, "could not create child process error: %u\n", GetLastError());
    if (!ret)
        return;
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    do
    {
        continuestatus = DBG_CONTINUE;
        ok(WaitForDebugEvent(&de, INFINITE), "reading debug event\n");

        if (de.dwThreadId != pi.dwThreadId)
        {
            trace("event %d not coming from main thread, ignoring\n", de.dwDebugEventCode);
            ContinueDebugEvent(de.dwProcessId, de.dwThreadId, DBG_CONTINUE);
            continue;
        }

        if (de.dwDebugEventCode == CREATE_PROCESS_DEBUG_EVENT)
        {
            if(de.u.CreateProcessInfo.lpBaseOfImage != pNtCurrentTeb()->Peb->ImageBaseAddress)
            {
                skip("child process loaded at different address, terminating it\n");
670
                pNtTerminateProcess(pi.hProcess, 0);
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            }
        }
        else if (de.dwDebugEventCode == EXCEPTION_DEBUG_EVENT)
        {
            CONTEXT ctx;
676
            int stage;
677 678 679 680 681

            counter++;
            status = pNtReadVirtualMemory(pi.hProcess, &code_mem, &code_mem_address,
                                          sizeof(code_mem_address), &size_read);
            ok(!status,"NtReadVirtualMemory failed with 0x%x\n", status);
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            status = pNtReadVirtualMemory(pi.hProcess, &test_stage, &stage,
                                          sizeof(stage), &size_read);
            ok(!status,"NtReadVirtualMemory failed with 0x%x\n", status);
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            ctx.ContextFlags = CONTEXT_FULL;
            status = pNtGetContextThread(pi.hThread, &ctx);
            ok(!status, "NtGetContextThread failed with 0x%x\n", status);

690
            trace("exception 0x%x at %p firstchance=%d Eip=0x%x, Eax=0x%x\n",
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                  de.u.Exception.ExceptionRecord.ExceptionCode,
                  de.u.Exception.ExceptionRecord.ExceptionAddress, de.u.Exception.dwFirstChance, ctx.Eip, ctx.Eax);

            if (counter > 100)
            {
                ok(FALSE, "got way too many exceptions, probaby caught in a infinite loop, terminating child\n");
                pNtTerminateProcess(pi.hProcess, 1);
            }
            else if (counter >= 2) /* skip startup breakpoint */
            {
701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749
                if (stage == 1)
                {
                    ok((char *)ctx.Eip == (char *)code_mem_address + 0xb, "Eip at %x instead of %p\n",
                       ctx.Eip, (char *)code_mem_address + 0xb);
                    /* setting the context from debugger does not affect the context, the exception handlers gets */
                    /* uncomment once wine is fixed */
                    /* ctx.Eip = 0x12345; */
                    ctx.Eax = 0xf00f00f1;

                    /* let the debuggee handle the exception */
                    continuestatus = DBG_EXCEPTION_NOT_HANDLED;
                }
                else if (stage == 2)
                {
                    if (de.u.Exception.dwFirstChance)
                    {
                        /* debugger gets first chance exception with unmodified ctx.Eip */
                        ok((char *)ctx.Eip == (char *)code_mem_address + 0xb, "Eip at 0x%x instead of %p\n",
                            ctx.Eip, (char *)code_mem_address + 0xb);

                        /* setting the context from debugger does not affect the context, the exception handlers gets */
                        /* uncomment once wine is fixed */
                        /* ctx.Eip = 0x12345; */
                        ctx.Eax = 0xf00f00f1;

                        /* pass exception to debuggee
                         * exception will not be handled and
                         * a second chance exception will be raised */
                        continuestatus = DBG_EXCEPTION_NOT_HANDLED;
                    }
                    else
                    {
                        /* debugger gets context after exception handler has played with it */
                        /* ctx.Eip is the same value the exception handler got */
                        if (de.u.Exception.ExceptionRecord.ExceptionCode == EXCEPTION_BREAKPOINT)
                        {
                            ok((char *)ctx.Eip == (char *)code_mem_address + 0xa, "Eip at 0x%x instead of %p\n",
                                ctx.Eip, (char *)code_mem_address + 0xa);
                            /* need to fixup Eip for debuggee */
                            if ((char *)ctx.Eip == (char *)code_mem_address + 0xa)
                                ctx.Eip += 1;
                        }
                        else
                            ok((char *)ctx.Eip == (char *)code_mem_address + 0xb, "Eip at 0x%x instead of %p\n",
                                ctx.Eip, (char *)code_mem_address + 0xb);
                        /* here we handle exception */
                    }
                }
                else
750
                    ok(FALSE, "unexpected stage %x\n", stage);
751

752 753 754 755 756 757 758 759 760
                status = pNtSetContextThread(pi.hThread, &ctx);
                ok(!status, "NtSetContextThread failed with 0x%x\n", status);
            }
        }

        ContinueDebugEvent(de.dwProcessId, de.dwThreadId, continuestatus);

    } while (de.dwDebugEventCode != EXIT_PROCESS_DEBUG_EVENT);

761
    winetest_wait_child_process( pi.hProcess );
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    ok(CloseHandle(pi.hThread) != 0, "error %u\n", GetLastError());
    ok(CloseHandle(pi.hProcess) != 0, "error %u\n", GetLastError());

    return;
}

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static DWORD simd_fault_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
                                 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
    int *stage = *(int **)(frame + 1);

    got_exception++;

    if( *stage == 1) {
        /* fault while executing sse instruction */
        context->Eip += 3; /* skip addps */
        return ExceptionContinueExecution;
    }

    /* stage 2 - divide by zero fault */
    if( rec->ExceptionCode == EXCEPTION_ILLEGAL_INSTRUCTION)
        skip("system doesn't support SIMD exceptions\n");
    else {
        ok( rec->ExceptionCode ==  STATUS_FLOAT_MULTIPLE_TRAPS,
            "exception code: %#x, should be %#x\n",
            rec->ExceptionCode,  STATUS_FLOAT_MULTIPLE_TRAPS);
        ok( rec->NumberParameters == 1, "# of params: %i, should be 1\n",
            rec->NumberParameters);
        if( rec->NumberParameters == 1 )
            ok( rec->ExceptionInformation[0] == 0, "param #1: %lx, should be 0\n", rec->ExceptionInformation[0]);
    }

    context->Eip += 3; /* skip divps */

    return ExceptionContinueExecution;
}

static const BYTE simd_exception_test[] = {
    0x83, 0xec, 0x4,                     /* sub $0x4, %esp       */
    0x0f, 0xae, 0x1c, 0x24,              /* stmxcsr (%esp)       */
    0x66, 0x81, 0x24, 0x24, 0xff, 0xfd,  /* andw $0xfdff,(%esp)  * enable divide by */
    0x0f, 0xae, 0x14, 0x24,              /* ldmxcsr (%esp)       * zero exceptions  */
    0x6a, 0x01,                          /* push   $0x1          */
    0x6a, 0x01,                          /* push   $0x1          */
    0x6a, 0x01,                          /* push   $0x1          */
    0x6a, 0x01,                          /* push   $0x1          */
    0x0f, 0x10, 0x0c, 0x24,              /* movups (%esp),%xmm1  * fill dividend  */
    0x0f, 0x57, 0xc0,                    /* xorps  %xmm0,%xmm0   * clear divisor  */
    0x0f, 0x5e, 0xc8,                    /* divps  %xmm0,%xmm1   * generate fault */
    0x83, 0xc4, 0x10,                    /* add    $0x10,%esp    */
    0x66, 0x81, 0x0c, 0x24, 0x00, 0x02,  /* orw    $0x200,(%esp) * disable exceptions */
    0x0f, 0xae, 0x14, 0x24,              /* ldmxcsr (%esp)       */
    0x83, 0xc4, 0x04,                    /* add    $0x4,%esp     */
    0xc3,                                /* ret */
};

static const BYTE sse_check[] = {
    0x0f, 0x58, 0xc8,                    /* addps  %xmm0,%xmm1 */
    0xc3,                                /* ret */
};

static void test_simd_exceptions(void)
{
    int stage;

    /* test if CPU & OS can do sse */
    stage = 1;
    got_exception = 0;
    run_exception_test(simd_fault_handler, &stage, sse_check, sizeof(sse_check));
    if(got_exception) {
        skip("system doesn't support SSE\n");
        return;
    }

    /* generate a SIMD exception */
    stage = 2;
    got_exception = 0;
    run_exception_test(simd_fault_handler, &stage, simd_exception_test,
                       sizeof(simd_exception_test));
    ok( got_exception == 1, "got exception: %i, should be 1\n", got_exception);
}

844 845 846 847 848
#endif  /* __i386__ */

START_TEST(exception)
{
#ifdef __i386__
849 850 851 852 853 854 855 856 857
    HMODULE hntdll = GetModuleHandleA("ntdll.dll");

    pNtCurrentTeb        = (void *)GetProcAddress( hntdll, "NtCurrentTeb" );
    pNtGetContextThread  = (void *)GetProcAddress( hntdll, "NtGetContextThread" );
    pNtSetContextThread  = (void *)GetProcAddress( hntdll, "NtSetContextThread" );
    pNtReadVirtualMemory = (void *)GetProcAddress( hntdll, "NtReadVirtualMemory" );
    pRtlRaiseException   = (void *)GetProcAddress( hntdll, "RtlRaiseException" );
    pNtTerminateProcess  = (void *)GetProcAddress( hntdll, "NtTerminateProcess" );
    pRtlAddVectoredExceptionHandler    = (void *)GetProcAddress( hntdll,
858
                                                                 "RtlAddVectoredExceptionHandler" );
859
    pRtlRemoveVectoredExceptionHandler = (void *)GetProcAddress( hntdll,
860
                                                                 "RtlRemoveVectoredExceptionHandler" );
861 862
    if (!pNtCurrentTeb)
    {
863
        skip( "NtCurrentTeb not found\n" );
864 865 866
        return;
    }

867 868 869 870 871
    if (pRtlAddVectoredExceptionHandler && pRtlRemoveVectoredExceptionHandler)
        have_vectored_api = TRUE;
    else
        skip("RtlAddVectoredExceptionHandler or RtlRemoveVectoredExceptionHandler not found\n");

872 873 874 875 876 877
    /* 1024 byte should be sufficient */
    code_mem = VirtualAlloc(NULL, 1024, MEM_RESERVE | MEM_COMMIT, PAGE_EXECUTE_READWRITE);
    if(!code_mem) {
        trace("VirtualAlloc failed\n");
        return;
    }
878 879

    my_argc = winetest_get_mainargs( &my_argv );
880
    if (my_argc >= 4)
881
    {
882 883 884 885 886 887 888 889 890
        void *addr;
        sscanf( my_argv[3], "%p", &addr );

        if (addr != &test_stage)
        {
            skip( "child process not mapped at same address (%p/%p)\n", &test_stage, addr);
            return;
        }

891 892 893 894 895 896 897 898 899
        /* child must be run under a debugger */
        if (!pNtCurrentTeb()->Peb->BeingDebugged)
        {
            ok(FALSE, "child process not being debugged?\n");
            return;
        }

        if (pRtlRaiseException)
        {
900 901 902 903 904
            test_stage = 1;
            run_rtlraiseexception_test(0x12345);
            run_rtlraiseexception_test(EXCEPTION_BREAKPOINT);
            run_rtlraiseexception_test(EXCEPTION_INVALID_HANDLE);
            test_stage = 2;
905 906 907 908 909 910 911 912 913 914 915
            run_rtlraiseexception_test(0x12345);
            run_rtlraiseexception_test(EXCEPTION_BREAKPOINT);
            run_rtlraiseexception_test(EXCEPTION_INVALID_HANDLE);
        }
        else
            skip( "RtlRaiseException not found\n" );

        /* rest of tests only run in parent */
        return;
    }

916
    test_prot_fault();
917
    test_exceptions();
918
    test_rtlraiseexception();
919
    test_debugger();
920
    test_simd_exceptions();
921 922

    VirtualFree(code_mem, 1024, MEM_RELEASE);
923 924
#endif
}