/*

 * Copyright (c) 1999, 2009, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

// do not include  precompiled  header file

# include "incls/_os_windows_x86.cpp.incl"

# include "unwind_windows_x86.hpp"

#undef REG_SP

#undef REG_FP

#undef REG_PC

#ifdef AMD64

#define REG_SP Rsp

#define REG_FP Rbp

#define REG_PC Rip

#else

#define REG_SP Esp

#define REG_FP Ebp

#define REG_PC Eip

#endif // AMD64

extern LONG WINAPI topLevelExceptionFilter(_EXCEPTION_POINTERS* );

// Install a win32 structured exception handler around thread.

void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {

  __try {

#ifndef AMD64

    // We store the current thread in this wrapperthread location

    // and determine how far away this address is from the structured

    // execption pointer that FS:[0] points to.  This get_thread

    // code can then get the thread pointer via FS.

    //

    // Warning:  This routine must NEVER be inlined since we'd end up with

    //           multiple offsets.

    //

    volatile Thread* wrapperthread = thread;

    if ( ThreadLocalStorage::get_thread_ptr_offset() == 0 ) {

      int thread_ptr_offset;

      __asm {

        lea eax, dword ptr wrapperthread;

        sub eax, dword ptr FS:[0H];

        mov thread_ptr_offset, eax

      };

      ThreadLocalStorage::set_thread_ptr_offset(thread_ptr_offset);

    }

#ifdef ASSERT

    // Verify that the offset hasn't changed since we initally captured

    // it. This might happen if we accidentally ended up with an

    // inlined version of this routine.

    else {

      int test_thread_ptr_offset;

      __asm {

        lea eax, dword ptr wrapperthread;

        sub eax, dword ptr FS:[0H];

        mov test_thread_ptr_offset, eax

      };

      assert(test_thread_ptr_offset == ThreadLocalStorage::get_thread_ptr_offset(),

             "thread pointer offset from SEH changed");

    }

#endif // ASSERT

#endif // !AMD64

    f(value, method, args, thread);

  } __except(topLevelExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) {

      // Nothing to do.

  }

}

#ifdef AMD64

// This is the language specific handler for exceptions

// originating from dynamically generated code.

// We call the standard structured exception handler

// We only expect Continued Execution since we cannot unwind

// from generated code.

LONG HandleExceptionFromCodeCache(

  IN PEXCEPTION_RECORD ExceptionRecord,

  IN ULONG64 EstablisherFrame,

  IN OUT PCONTEXT ContextRecord,

  IN OUT PDISPATCHER_CONTEXT DispatcherContext) {

  EXCEPTION_POINTERS ep;

  LONG result;

  ep.ExceptionRecord = ExceptionRecord;

  ep.ContextRecord = ContextRecord;

  result = topLevelExceptionFilter(&ep);

  // We better only get a CONTINUE_EXECUTION from our handler

  // since we don't have unwind information registered.

  guarantee( result == EXCEPTION_CONTINUE_EXECUTION,

             "Unexpected result from topLevelExceptionFilter");

  return(ExceptionContinueExecution);

}

// Structure containing the Windows Data Structures required

// to register our Code Cache exception handler.

// We put these in the CodeCache since the API requires

// all addresses in these structures are relative to the Code

// area registered with RtlAddFunctionTable.

typedef struct {

  char ExceptionHandlerInstr[16];  // jmp HandleExceptionFromCodeCache

  RUNTIME_FUNCTION rt;

  UNWIND_INFO_EH_ONLY unw;

} DynamicCodeData, *pDynamicCodeData;

#endif // AMD64

//

// Register our CodeCache area with the OS so it will dispatch exceptions

// to our topLevelExceptionFilter when we take an exception in our

// dynamically generated code.

//

// Arguments:  low and high are the address of the full reserved

// codeCache area

//

bool os::register_code_area(char *low, char *high) {

#ifdef AMD64

  ResourceMark rm;

  pDynamicCodeData pDCD;

  PRUNTIME_FUNCTION prt;

  PUNWIND_INFO_EH_ONLY punwind;

  // If we are using Vectored Exceptions we don't need this registration

  if (UseVectoredExceptions) return true;

  BufferBlob* b = BufferBlob::create("CodeCache Exception Handler", sizeof (DynamicCodeData));

  CodeBuffer cb(b->instructions_begin(), b->instructions_size());

  MacroAssembler* masm = new MacroAssembler(&cb);

  pDCD = (pDynamicCodeData) masm->pc();

  masm->jump(ExternalAddress((address)&HandleExceptionFromCodeCache));

  masm->flush();

  // Create an Unwind Structure specifying no unwind info

  // other than an Exception Handler

  punwind = &pDCD->unw;

  punwind->Version = 1;

  punwind->Flags = UNW_FLAG_EHANDLER;

  punwind->SizeOfProlog = 0;

  punwind->CountOfCodes = 0;

  punwind->FrameRegister = 0;

  punwind->FrameOffset = 0;

  punwind->ExceptionHandler = (char *)(&(pDCD->ExceptionHandlerInstr[0])) -

                              (char*)low;

  punwind->ExceptionData[0] = 0;

  // This structure describes the covered dynamic code area.

  // Addresses are relative to the beginning on the code cache area

  prt = &pDCD->rt;

  prt->BeginAddress = 0;

  prt->EndAddress = (ULONG)(high - low);

  prt->UnwindData = ((char *)punwind - low);

  guarantee(RtlAddFunctionTable(prt, 1, (ULONGLONG)low),

            "Failed to register Dynamic Code Exception Handler with RtlAddFunctionTable");

#endif // AMD64

  return true;

}

void os::initialize_thread() {

// Nothing to do.

}

// Atomics and Stub Functions

typedef jint      xchg_func_t            (jint,     volatile jint*);

typedef intptr_t  xchg_ptr_func_t        (intptr_t, volatile intptr_t*);

typedef jint      cmpxchg_func_t         (jint,     volatile jint*,  jint);

typedef jlong     cmpxchg_long_func_t    (jlong,    volatile jlong*, jlong);

typedef jint      add_func_t             (jint,     volatile jint*);

typedef intptr_t  add_ptr_func_t         (intptr_t, volatile intptr_t*);

#ifdef AMD64

jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) {

  // try to use the stub:

  xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry());

  if (func != NULL) {

    os::atomic_xchg_func = func;

    return (*func)(exchange_value, dest);

  }

  assert(Threads::number_of_threads() == 0, "for bootstrap only");

  jint old_value = *dest;

  *dest = exchange_value;

  return old_value;

}

intptr_t os::atomic_xchg_ptr_bootstrap(intptr_t exchange_value, volatile intptr_t* dest) {

  // try to use the stub:

  xchg_ptr_func_t* func = CAST_TO_FN_PTR(xchg_ptr_func_t*, StubRoutines::atomic_xchg_ptr_entry());

  if (func != NULL) {

    os::atomic_xchg_ptr_func = func;

    return (*func)(exchange_value, dest);

  }

  assert(Threads::number_of_threads() == 0, "for bootstrap only");

  intptr_t old_value = *dest;

  *dest = exchange_value;

  return old_value;

}

jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) {

  // try to use the stub:

  cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());

  if (func != NULL) {

    os::atomic_cmpxchg_func = func;

    return (*func)(exchange_value, dest, compare_value);

  }

  assert(Threads::number_of_threads() == 0, "for bootstrap only");

  jint old_value = *dest;

  if (old_value == compare_value)

    *dest = exchange_value;

  return old_value;

}

#endif // AMD64

jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) {

  // try to use the stub:

  cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());

  if (func != NULL) {

    os::atomic_cmpxchg_long_func = func;

    return (*func)(exchange_value, dest, compare_value);

  }

  assert(Threads::number_of_threads() == 0, "for bootstrap only");

  jlong old_value = *dest;

  if (old_value == compare_value)

    *dest = exchange_value;

  return old_value;

}

#ifdef AMD64

jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) {

  // try to use the stub:

  add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry());

  if (func != NULL) {

    os::atomic_add_func = func;

    return (*func)(add_value, dest);

  }

  assert(Threads::number_of_threads() == 0, "for bootstrap only");

  return (*dest) += add_value;

}

intptr_t os::atomic_add_ptr_bootstrap(intptr_t add_value, volatile intptr_t* dest) {

  // try to use the stub:

  add_ptr_func_t* func = CAST_TO_FN_PTR(add_ptr_func_t*, StubRoutines::atomic_add_ptr_entry());

  if (func != NULL) {

    os::atomic_add_ptr_func = func;

    return (*func)(add_value, dest);

  }

  assert(Threads::number_of_threads() == 0, "for bootstrap only");

  return (*dest) += add_value;

}

xchg_func_t*         os::atomic_xchg_func         = os::atomic_xchg_bootstrap;

xchg_ptr_func_t*     os::atomic_xchg_ptr_func     = os::atomic_xchg_ptr_bootstrap;

cmpxchg_func_t*      os::atomic_cmpxchg_func      = os::atomic_cmpxchg_bootstrap;

add_func_t*          os::atomic_add_func          = os::atomic_add_bootstrap;

add_ptr_func_t*      os::atomic_add_ptr_func      = os::atomic_add_ptr_bootstrap;

#endif // AMD64

cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;

ExtendedPC os::fetch_frame_from_context(void* ucVoid,

                    intptr_t** ret_sp, intptr_t** ret_fp) {

  ExtendedPC  epc;

  CONTEXT* uc = (CONTEXT*)ucVoid;

  if (uc != NULL) {

    epc = ExtendedPC((address)uc->REG_PC);

    if (ret_sp) *ret_sp = (intptr_t*)uc->REG_SP;

    if (ret_fp) *ret_fp = (intptr_t*)uc->REG_FP;

  } else {

    // construct empty ExtendedPC for return value checking

    epc = ExtendedPC(NULL);

    if (ret_sp) *ret_sp = (intptr_t *)NULL;

    if (ret_fp) *ret_fp = (intptr_t *)NULL;

  }

  return epc;

}

frame os::fetch_frame_from_context(void* ucVoid) {

  intptr_t* sp;

  intptr_t* fp;

  ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);

  return frame(sp, fp, epc.pc());

}

// VC++ does not save frame pointer on stack in optimized build. It

// can be turned off by /Oy-. If we really want to walk C frames,

// we can use the StackWalk() API.

frame os::get_sender_for_C_frame(frame* fr) {

  return frame(fr->sender_sp(), fr->link(), fr->sender_pc());

}

#ifndef AMD64

intptr_t* _get_previous_fp() {

  intptr_t **frameptr;

  __asm {

    mov frameptr, ebp

  };

  return *frameptr;

}

#endif // !AMD64

frame os::current_frame() {

#ifdef AMD64

  // apparently _asm not supported on windows amd64

  typedef intptr_t*      get_fp_func           ();

  get_fp_func* func = CAST_TO_FN_PTR(get_fp_func*,

                                     StubRoutines::x86::get_previous_fp_entry());

  if (func == NULL) return frame(NULL, NULL, NULL);

  intptr_t* fp = (*func)();

#else

  intptr_t* fp = _get_previous_fp();

#endif // AMD64

  frame myframe((intptr_t*)os::current_stack_pointer(),

                (intptr_t*)fp,

                CAST_FROM_FN_PTR(address, os::current_frame));

  if (os::is_first_C_frame(&myframe)) {

    // stack is not walkable

    return frame(NULL, NULL, NULL);

  } else {

    return os::get_sender_for_C_frame(&myframe);

  }

}

void os::print_context(outputStream *st, void *context) {

  if (context == NULL) return;

  CONTEXT* uc = (CONTEXT*)context;

  st->print_cr("Registers:");

#ifdef AMD64

  st->cr();

  st->cr();

#else

  st->print(  "EAX=" INTPTR_FORMAT, uc->Eax);

  st->print(", EBX=" INTPTR_FORMAT, uc->Ebx);

  st->print(", ECX=" INTPTR_FORMAT, uc->Ecx);

  st->print(", EDX=" INTPTR_FORMAT, uc->Edx);

  st->cr();

  st->print(  "ESP=" INTPTR_FORMAT, uc->Esp);

  st->print(", EBP=" INTPTR_FORMAT, uc->Ebp);

  st->print(", ESI=" INTPTR_FORMAT, uc->Esi);

  st->print(", EDI=" INTPTR_FORMAT, uc->Edi);

  st->cr();

  st->print(  "EIP=" INTPTR_FORMAT, uc->Eip);

  st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);

#endif // AMD64

  st->cr();

  st->cr();

  intptr_t *sp = (intptr_t *)uc->REG_SP;

  st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);

  print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t));

  st->cr();

  // Note: it may be unsafe to inspect memory near pc. For example, pc may

  // point to garbage if entry point in an nmethod is corrupted. Leave

  // this at the end, and hope for the best.

  address pc = (address)uc->REG_PC;

  st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);

  print_hex_dump(st, pc - 16, pc + 16, sizeof(char));

  st->cr();

}