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 /*

  * Copyright (c) 1998, 2011, 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

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  */

 #include "precompiled.hpp"

 #include "asm/assembler.inline.hpp"

 #include "assembler_x86.inline.hpp"

 #include "code/relocInfo.hpp"

 #include "nativeInst_x86.hpp"

 #include "oops/oop.inline.hpp"

 #include "runtime/safepoint.hpp"

 void Relocation::pd_set_data_value(address x, intptr_t o, bool verify_only) {

 #ifdef AMD64

   x += o;

   typedef Assembler::WhichOperand WhichOperand;

   WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm, call32, narrow oop

   assert(which == Assembler::disp32_operand ||

          which == Assembler::narrow_oop_operand ||

          which == Assembler::imm_operand, "format unpacks ok");

   if (which == Assembler::imm_operand) {

     if (verify_only) {

       assert(*pd_address_in_code() == x, "instructions must match");

     } else {

       *pd_address_in_code() = x;

     }

   } else if (which == Assembler::narrow_oop_operand) {

     address disp = Assembler::locate_operand(addr(), which);

     if (verify_only) {

       assert(*(uint32_t*) disp == oopDesc::encode_heap_oop((oop)x), "instructions must match");

     } else {

       *(int32_t*) disp = oopDesc::encode_heap_oop((oop)x);

     }

   } else {

     // Note:  Use runtime_call_type relocations for call32_operand.

     address ip = addr();

     address disp = Assembler::locate_operand(ip, which);

     address next_ip = Assembler::locate_next_instruction(ip);

     if (verify_only) {

       assert(*(int32_t*) disp == (x - next_ip), "instructions must match");

     } else {

       *(int32_t*) disp = x - next_ip;

     }

   }

 #else

   if (verify_only) {

     assert(*pd_address_in_code() == (x + o), "instructions must match");

   } else {

     *pd_address_in_code() = x + o;

   }

 #endif // AMD64

 }

 address Relocation::pd_call_destination(address orig_addr) {

   intptr_t adj = 0;

   if (orig_addr != NULL) {

     // We just moved this call instruction from orig_addr to addr().

     // This means its target will appear to have grown by addr() - orig_addr.

     adj = -( addr() - orig_addr );

   }

   NativeInstruction* ni = nativeInstruction_at(addr());

   if (ni->is_call()) {

     return nativeCall_at(addr())->destination() + adj;

   } else if (ni->is_jump()) {

     return nativeJump_at(addr())->jump_destination() + adj;

   } else if (ni->is_cond_jump()) {

     return nativeGeneralJump_at(addr())->jump_destination() + adj;

   } else if (ni->is_mov_literal64()) {

     return (address) ((NativeMovConstReg*)ni)->data();

   } else {

     ShouldNotReachHere();

     return NULL;

   }

 }

 void Relocation::pd_set_call_destination(address x) {

   NativeInstruction* ni = nativeInstruction_at(addr());

   if (ni->is_call()) {

     nativeCall_at(addr())->set_destination(x);

   } else if (ni->is_jump()) {

     NativeJump* nj = nativeJump_at(addr());

     // Unresolved jumps are recognized by a destination of -1

     // However 64bit can't actually produce such an address

     // and encodes a jump to self but jump_destination will

     // return a -1 as the signal. We must not relocate this

     // jmp or the ic code will not see it as unresolved.

     if (nj->jump_destination() == (address) -1) {

       x = addr(); // jump to self

     }

     nj->set_jump_destination(x);

   } else if (ni->is_cond_jump()) {

     // %%%% kludge this, for now, until we get a jump_destination method

     address old_dest = nativeGeneralJump_at(addr())->jump_destination();

     address disp = Assembler::locate_operand(addr(), Assembler::call32_operand);

     *(jint*)disp += (x - old_dest);

   } else if (ni->is_mov_literal64()) {

     ((NativeMovConstReg*)ni)->set_data((intptr_t)x);

   } else {

     ShouldNotReachHere();

   }

 }

 address* Relocation::pd_address_in_code() {

   // All embedded Intel addresses are stored in 32-bit words.

   // Since the addr points at the start of the instruction,

   // we must parse the instruction a bit to find the embedded word.

   assert(is_data(), "must be a DataRelocation");

   typedef Assembler::WhichOperand WhichOperand;

   WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm/imm32

 #ifdef AMD64

   assert(which == Assembler::disp32_operand ||

          which == Assembler::call32_operand ||

          which == Assembler::imm_operand, "format unpacks ok");

   if (which != Assembler::imm_operand) {

     // The "address" in the code is a displacement can't return it as

     // and address* since it is really a jint*

     ShouldNotReachHere();

     return NULL;

   }

 #else

   assert(which == Assembler::disp32_operand || which == Assembler::imm_operand, "format unpacks ok");

 #endif // AMD64

   return (address*) Assembler::locate_operand(addr(), which);

 }

 address Relocation::pd_get_address_from_code() {

 #ifdef AMD64

   // All embedded Intel addresses are stored in 32-bit words.

   // Since the addr points at the start of the instruction,

   // we must parse the instruction a bit to find the embedded word.

   assert(is_data(), "must be a DataRelocation");

   typedef Assembler::WhichOperand WhichOperand;

   WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm/imm32

   assert(which == Assembler::disp32_operand ||

          which == Assembler::call32_operand ||

          which == Assembler::imm_operand, "format unpacks ok");

   if (which != Assembler::imm_operand) {

     address ip = addr();

     address disp = Assembler::locate_operand(ip, which);

     address next_ip = Assembler::locate_next_instruction(ip);

     address a = next_ip + *(int32_t*) disp;

     return a;

   }

 #endif // AMD64

   return *pd_address_in_code();

 }

 int Relocation::pd_breakpoint_size() {

   // minimum breakpoint size, in short words

   return NativeIllegalInstruction::instruction_size / sizeof(short);

 }

 void Relocation::pd_swap_in_breakpoint(address x, short* instrs, int instrlen) {

   Untested("pd_swap_in_breakpoint");

   if (instrs != NULL) {

     assert(instrlen * sizeof(short) == NativeIllegalInstruction::instruction_size, "enough instrlen in reloc. data");

     for (int i = 0; i < instrlen; i++) {

       instrs[i] = ((short*)x)[i];

     }

   }

   NativeIllegalInstruction::insert(x);

 }

 void Relocation::pd_swap_out_breakpoint(address x, short* instrs, int instrlen) {

   Untested("pd_swap_out_breakpoint");

   assert(NativeIllegalInstruction::instruction_size == sizeof(short), "right address unit for update");

   NativeInstruction* ni = nativeInstruction_at(x);

   *(short*)ni->addr_at(0) = instrs[0];

 }

 void poll_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {

 #ifdef _LP64

   if (!Assembler::is_polling_page_far()) {

     typedef Assembler::WhichOperand WhichOperand;

     WhichOperand which = (WhichOperand) format();

     // This format is imm but it is really disp32

     which = Assembler::disp32_operand;

     address orig_addr = old_addr_for(addr(), src, dest);

     NativeInstruction* oni = nativeInstruction_at(orig_addr);

     int32_t* orig_disp = (int32_t*) Assembler::locate_operand(orig_addr, which);

     // This poll_addr is incorrect by the size of the instruction it is irrelevant

     intptr_t poll_addr = (intptr_t)oni + *orig_disp;

     NativeInstruction* ni = nativeInstruction_at(addr());

     intptr_t new_disp = poll_addr - (intptr_t) ni;

     int32_t* disp = (int32_t*) Assembler::locate_operand(addr(), which);

     * disp = (int32_t)new_disp;

   }

 #endif // _LP64

 }

 void poll_return_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {

 #ifdef _LP64

   if (!Assembler::is_polling_page_far()) {

     typedef Assembler::WhichOperand WhichOperand;

     WhichOperand which = (WhichOperand) format();

     // This format is imm but it is really disp32

     which = Assembler::disp32_operand;

     address orig_addr = old_addr_for(addr(), src, dest);

     NativeInstruction* oni = nativeInstruction_at(orig_addr);

     int32_t* orig_disp = (int32_t*) Assembler::locate_operand(orig_addr, which);

     // This poll_addr is incorrect by the size of the instruction it is irrelevant

     intptr_t poll_addr = (intptr_t)oni + *orig_disp;

     NativeInstruction* ni = nativeInstruction_at(addr());

     intptr_t new_disp = poll_addr - (intptr_t) ni;

     int32_t* disp = (int32_t*) Assembler::locate_operand(addr(), which);

     * disp = (int32_t)new_disp;

   }

 #endif // _LP64

 }