duke@435: /*
iveresov@2686:  * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #include "precompiled.hpp"
stefank@2314: #include "asm/assembler.inline.hpp"
stefank@2314: #include "assembler_x86.inline.hpp"
stefank@2314: #include "code/relocInfo.hpp"
stefank@2314: #include "nativeInst_x86.hpp"
stefank@2314: #include "oops/oop.inline.hpp"
stefank@2314: #include "runtime/safepoint.hpp"
duke@435: 
duke@435: 
never@2657: void Relocation::pd_set_data_value(address x, intptr_t o, bool verify_only) {
duke@435: #ifdef AMD64
duke@435:   x += o;
duke@435:   typedef Assembler::WhichOperand WhichOperand;
never@739:   WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm, call32, narrow oop
duke@435:   assert(which == Assembler::disp32_operand ||
kvn@599:          which == Assembler::narrow_oop_operand ||
never@739:          which == Assembler::imm_operand, "format unpacks ok");
never@739:   if (which == Assembler::imm_operand) {
never@2657:     if (verify_only) {
never@2657:       assert(*pd_address_in_code() == x, "instructions must match");
never@2657:     } else {
never@2657:       *pd_address_in_code() = x;
never@2657:     }
kvn@599:   } else if (which == Assembler::narrow_oop_operand) {
kvn@599:     address disp = Assembler::locate_operand(addr(), which);
never@2657:     if (verify_only) {
never@2657:       assert(*(uint32_t*) disp == oopDesc::encode_heap_oop((oop)x), "instructions must match");
never@2657:     } else {
never@2657:       *(int32_t*) disp = oopDesc::encode_heap_oop((oop)x);
never@2657:     }
duke@435:   } else {
duke@435:     // Note:  Use runtime_call_type relocations for call32_operand.
duke@435:     address ip = addr();
duke@435:     address disp = Assembler::locate_operand(ip, which);
duke@435:     address next_ip = Assembler::locate_next_instruction(ip);
never@2657:     if (verify_only) {
never@2657:       assert(*(int32_t*) disp == (x - next_ip), "instructions must match");
never@2657:     } else {
never@2657:       *(int32_t*) disp = x - next_ip;
never@2657:     }
duke@435:   }
duke@435: #else
never@2657:   if (verify_only) {
never@2657:     assert(*pd_address_in_code() == (x + o), "instructions must match");
never@2657:   } else {
never@2657:     *pd_address_in_code() = x + o;
never@2657:   }
duke@435: #endif // AMD64
duke@435: }
duke@435: 
duke@435: 
duke@435: address Relocation::pd_call_destination(address orig_addr) {
duke@435:   intptr_t adj = 0;
duke@435:   if (orig_addr != NULL) {
duke@435:     // We just moved this call instruction from orig_addr to addr().
duke@435:     // This means its target will appear to have grown by addr() - orig_addr.
duke@435:     adj = -( addr() - orig_addr );
duke@435:   }
duke@435:   NativeInstruction* ni = nativeInstruction_at(addr());
duke@435:   if (ni->is_call()) {
duke@435:     return nativeCall_at(addr())->destination() + adj;
duke@435:   } else if (ni->is_jump()) {
duke@435:     return nativeJump_at(addr())->jump_destination() + adj;
duke@435:   } else if (ni->is_cond_jump()) {
duke@435:     return nativeGeneralJump_at(addr())->jump_destination() + adj;
duke@435:   } else if (ni->is_mov_literal64()) {
duke@435:     return (address) ((NativeMovConstReg*)ni)->data();
duke@435:   } else {
duke@435:     ShouldNotReachHere();
duke@435:     return NULL;
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: void Relocation::pd_set_call_destination(address x) {
duke@435:   NativeInstruction* ni = nativeInstruction_at(addr());
duke@435:   if (ni->is_call()) {
duke@435:     nativeCall_at(addr())->set_destination(x);
duke@435:   } else if (ni->is_jump()) {
duke@435:     NativeJump* nj = nativeJump_at(addr());
never@739: 
never@739:     // Unresolved jumps are recognized by a destination of -1
never@739:     // However 64bit can't actually produce such an address
never@739:     // and encodes a jump to self but jump_destination will
never@739:     // return a -1 as the signal. We must not relocate this
never@739:     // jmp or the ic code will not see it as unresolved.
never@739: 
duke@435:     if (nj->jump_destination() == (address) -1) {
never@739:       x = addr(); // jump to self
duke@435:     }
duke@435:     nj->set_jump_destination(x);
duke@435:   } else if (ni->is_cond_jump()) {
duke@435:     // %%%% kludge this, for now, until we get a jump_destination method
duke@435:     address old_dest = nativeGeneralJump_at(addr())->jump_destination();
duke@435:     address disp = Assembler::locate_operand(addr(), Assembler::call32_operand);
duke@435:     *(jint*)disp += (x - old_dest);
duke@435:   } else if (ni->is_mov_literal64()) {
duke@435:     ((NativeMovConstReg*)ni)->set_data((intptr_t)x);
duke@435:   } else {
duke@435:     ShouldNotReachHere();
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: address* Relocation::pd_address_in_code() {
duke@435:   // All embedded Intel addresses are stored in 32-bit words.
duke@435:   // Since the addr points at the start of the instruction,
duke@435:   // we must parse the instruction a bit to find the embedded word.
duke@435:   assert(is_data(), "must be a DataRelocation");
duke@435:   typedef Assembler::WhichOperand WhichOperand;
never@739:   WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm/imm32
duke@435: #ifdef AMD64
duke@435:   assert(which == Assembler::disp32_operand ||
duke@435:          which == Assembler::call32_operand ||
never@739:          which == Assembler::imm_operand, "format unpacks ok");
never@739:   if (which != Assembler::imm_operand) {
duke@435:     // The "address" in the code is a displacement can't return it as
duke@435:     // and address* since it is really a jint*
duke@435:     ShouldNotReachHere();
duke@435:     return NULL;
duke@435:   }
duke@435: #else
never@739:   assert(which == Assembler::disp32_operand || which == Assembler::imm_operand, "format unpacks ok");
duke@435: #endif // AMD64
duke@435:   return (address*) Assembler::locate_operand(addr(), which);
duke@435: }
duke@435: 
duke@435: 
duke@435: address Relocation::pd_get_address_from_code() {
duke@435: #ifdef AMD64
duke@435:   // All embedded Intel addresses are stored in 32-bit words.
duke@435:   // Since the addr points at the start of the instruction,
duke@435:   // we must parse the instruction a bit to find the embedded word.
duke@435:   assert(is_data(), "must be a DataRelocation");
duke@435:   typedef Assembler::WhichOperand WhichOperand;
never@739:   WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm/imm32
duke@435:   assert(which == Assembler::disp32_operand ||
duke@435:          which == Assembler::call32_operand ||
never@739:          which == Assembler::imm_operand, "format unpacks ok");
never@739:   if (which != Assembler::imm_operand) {
duke@435:     address ip = addr();
duke@435:     address disp = Assembler::locate_operand(ip, which);
duke@435:     address next_ip = Assembler::locate_next_instruction(ip);
duke@435:     address a = next_ip + *(int32_t*) disp;
duke@435:     return a;
duke@435:   }
duke@435: #endif // AMD64
duke@435:   return *pd_address_in_code();
duke@435: }
duke@435: 
duke@435: int Relocation::pd_breakpoint_size() {
duke@435:   // minimum breakpoint size, in short words
duke@435:   return NativeIllegalInstruction::instruction_size / sizeof(short);
duke@435: }
duke@435: 
duke@435: void Relocation::pd_swap_in_breakpoint(address x, short* instrs, int instrlen) {
duke@435:   Untested("pd_swap_in_breakpoint");
duke@435:   if (instrs != NULL) {
duke@435:     assert(instrlen * sizeof(short) == NativeIllegalInstruction::instruction_size, "enough instrlen in reloc. data");
duke@435:     for (int i = 0; i < instrlen; i++) {
duke@435:       instrs[i] = ((short*)x)[i];
duke@435:     }
duke@435:   }
duke@435:   NativeIllegalInstruction::insert(x);
duke@435: }
duke@435: 
duke@435: 
duke@435: void Relocation::pd_swap_out_breakpoint(address x, short* instrs, int instrlen) {
duke@435:   Untested("pd_swap_out_breakpoint");
duke@435:   assert(NativeIllegalInstruction::instruction_size == sizeof(short), "right address unit for update");
duke@435:   NativeInstruction* ni = nativeInstruction_at(x);
duke@435:   *(short*)ni->addr_at(0) = instrs[0];
duke@435: }
never@739: 
never@739: void poll_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
never@739: #ifdef _LP64
iveresov@2686:   if (!Assembler::is_polling_page_far()) {
iveresov@2686:     typedef Assembler::WhichOperand WhichOperand;
iveresov@2686:     WhichOperand which = (WhichOperand) format();
iveresov@2686:     // This format is imm but it is really disp32
iveresov@2686:     which = Assembler::disp32_operand;
iveresov@2686:     address orig_addr = old_addr_for(addr(), src, dest);
iveresov@2686:     NativeInstruction* oni = nativeInstruction_at(orig_addr);
iveresov@2686:     int32_t* orig_disp = (int32_t*) Assembler::locate_operand(orig_addr, which);
iveresov@2686:     // This poll_addr is incorrect by the size of the instruction it is irrelevant
iveresov@2686:     intptr_t poll_addr = (intptr_t)oni + *orig_disp;
never@739: 
iveresov@2686:     NativeInstruction* ni = nativeInstruction_at(addr());
iveresov@2686:     intptr_t new_disp = poll_addr - (intptr_t) ni;
never@739: 
iveresov@2686:     int32_t* disp = (int32_t*) Assembler::locate_operand(addr(), which);
iveresov@2686:     * disp = (int32_t)new_disp;
iveresov@2686:   }
never@739: #endif // _LP64
never@739: }
never@739: 
never@739: void poll_return_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
never@739: #ifdef _LP64
iveresov@2686:   if (!Assembler::is_polling_page_far()) {
iveresov@2686:     typedef Assembler::WhichOperand WhichOperand;
iveresov@2686:     WhichOperand which = (WhichOperand) format();
iveresov@2686:     // This format is imm but it is really disp32
iveresov@2686:     which = Assembler::disp32_operand;
iveresov@2686:     address orig_addr = old_addr_for(addr(), src, dest);
iveresov@2686:     NativeInstruction* oni = nativeInstruction_at(orig_addr);
iveresov@2686:     int32_t* orig_disp = (int32_t*) Assembler::locate_operand(orig_addr, which);
iveresov@2686:     // This poll_addr is incorrect by the size of the instruction it is irrelevant
iveresov@2686:     intptr_t poll_addr = (intptr_t)oni + *orig_disp;
never@739: 
iveresov@2686:     NativeInstruction* ni = nativeInstruction_at(addr());
iveresov@2686:     intptr_t new_disp = poll_addr - (intptr_t) ni;
never@739: 
iveresov@2686:     int32_t* disp = (int32_t*) Assembler::locate_operand(addr(), which);
iveresov@2686:     * disp = (int32_t)new_disp;
iveresov@2686:   }
never@739: #endif // _LP64
never@739: }