Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright 1997-2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.com if you need additional information or

  * have any questions.

  *

  */

 # include "incls/_precompiled.incl"

 # include "incls/_nativeInst_sparc.cpp.incl"

 bool NativeInstruction::is_dtrace_trap() {

   return !is_nop();

 }

 void NativeInstruction::set_data64_sethi(address instaddr, intptr_t x) {

   ResourceMark rm;

   CodeBuffer buf(instaddr, 10 * BytesPerInstWord );

   MacroAssembler* _masm = new MacroAssembler(&buf);

   Register destreg;

   destreg = inv_rd(*(unsigned int *)instaddr);

   // Generate a the new sequence

   Address dest( destreg, (address)x );

   _masm->sethi( dest, true );

   ICache::invalidate_range(instaddr, 7 * BytesPerInstWord);

 }

 void NativeInstruction::verify() {

   // make sure code pattern is actually an instruction address

   address addr = addr_at(0);

   if (addr == 0 || ((intptr_t)addr & 3) != 0) {

     fatal("not an instruction address");

   }

 }

 void NativeInstruction::print() {

   tty->print_cr(INTPTR_FORMAT ": 0x%x", addr_at(0), long_at(0));

 }

 void NativeInstruction::set_long_at(int offset, int i) {

   address addr = addr_at(offset);

   *(int*)addr = i;

   ICache::invalidate_word(addr);

 }

 void NativeInstruction::set_jlong_at(int offset, jlong i) {

   address addr = addr_at(offset);

   *(jlong*)addr = i;

   // Don't need to invalidate 2 words here, because

   // the flush instruction operates on doublewords.

   ICache::invalidate_word(addr);

 }

 void NativeInstruction::set_addr_at(int offset, address x) {

   address addr = addr_at(offset);

   assert( ((intptr_t)addr & (wordSize-1)) == 0, "set_addr_at bad address alignment");

   *(uintptr_t*)addr = (uintptr_t)x;

   // Don't need to invalidate 2 words here in the 64-bit case,

   // because the flush instruction operates on doublewords.

   ICache::invalidate_word(addr);

   // The Intel code has this assertion for NativeCall::set_destination,

   // NativeMovConstReg::set_data, NativeMovRegMem::set_offset,

   // NativeJump::set_jump_destination, and NativePushImm32::set_data

   //assert (Patching_lock->owned_by_self(), "must hold lock to patch instruction")

 }

 bool NativeInstruction::is_zero_test(Register &reg) {

   int x = long_at(0);

   Assembler::op3s temp = (Assembler::op3s) (Assembler::sub_op3 | Assembler::cc_bit_op3);

   if (is_op3(x, temp, Assembler::arith_op) &&

       inv_immed(x) && inv_rd(x) == G0) {

       if (inv_rs1(x) == G0) {

         reg = inv_rs2(x);

         return true;

       } else if (inv_rs2(x) == G0) {

         reg = inv_rs1(x);

         return true;

       }

   }

   return false;

 }

 bool NativeInstruction::is_load_store_with_small_offset(Register reg) {

   int x = long_at(0);

   if (is_op(x, Assembler::ldst_op) &&

       inv_rs1(x) == reg && inv_immed(x)) {

     return true;

   }

   return false;

 }

 void NativeCall::verify() {

   NativeInstruction::verify();

   // make sure code pattern is actually a call instruction

   if (!is_op(long_at(0), Assembler::call_op)) {

     fatal("not a call");

   }

 }

 void NativeCall::print() {

   tty->print_cr(INTPTR_FORMAT ": call " INTPTR_FORMAT, instruction_address(), destination());

 }

 // MT-safe patching of a call instruction (and following word).

 // First patches the second word, and then atomicly replaces

 // the first word with the first new instruction word.

 // Other processors might briefly see the old first word

 // followed by the new second word.  This is OK if the old

 // second word is harmless, and the new second word may be

 // harmlessly executed in the delay slot of the call.

 void NativeCall::replace_mt_safe(address instr_addr, address code_buffer) {

   assert(Patching_lock->is_locked() ||

          SafepointSynchronize::is_at_safepoint(), "concurrent code patching");

    assert (instr_addr != NULL, "illegal address for code patching");

    NativeCall* n_call =  nativeCall_at (instr_addr); // checking that it is a call

    assert(NativeCall::instruction_size == 8, "wrong instruction size; must be 8");

    int i0 = ((int*)code_buffer)[0];

    int i1 = ((int*)code_buffer)[1];

    int* contention_addr = (int*) n_call->addr_at(1*BytesPerInstWord);

    assert(inv_op(*contention_addr) == Assembler::arith_op ||

           *contention_addr == nop_instruction() || !VM_Version::v9_instructions_work(),

           "must not interfere with original call");

    // The set_long_at calls do the ICacheInvalidate so we just need to do them in reverse order

    n_call->set_long_at(1*BytesPerInstWord, i1);

    n_call->set_long_at(0*BytesPerInstWord, i0);

    // NOTE:  It is possible that another thread T will execute

    // only the second patched word.

    // In other words, since the original instruction is this

    //    call patching_stub; nop                   (NativeCall)

    // and the new sequence from the buffer is this:

    //    sethi %hi(K), %r; add %r, %lo(K), %r      (NativeMovConstReg)

    // what T will execute is this:

    //    call patching_stub; add %r, %lo(K), %r

    // thereby putting garbage into %r before calling the patching stub.

    // This is OK, because the patching stub ignores the value of %r.

    // Make sure the first-patched instruction, which may co-exist

    // briefly with the call, will do something harmless.

    assert(inv_op(*contention_addr) == Assembler::arith_op ||

           *contention_addr == nop_instruction() || !VM_Version::v9_instructions_work(),

           "must not interfere with original call");

 }

 // Similar to replace_mt_safe, but just changes the destination.  The

 // important thing is that free-running threads are able to execute this

 // call instruction at all times.  Thus, the displacement field must be

 // instruction-word-aligned.  This is always true on SPARC.

 //

 // Used in the runtime linkage of calls; see class CompiledIC.

 void NativeCall::set_destination_mt_safe(address dest) {

   assert(Patching_lock->is_locked() ||

          SafepointSynchronize::is_at_safepoint(), "concurrent code patching");

   // set_destination uses set_long_at which does the ICache::invalidate

   set_destination(dest);

 }

 // Code for unit testing implementation of NativeCall class

 void NativeCall::test() {

 #ifdef ASSERT

   ResourceMark rm;

   CodeBuffer cb("test", 100, 100);

   MacroAssembler* a = new MacroAssembler(&cb);

   NativeCall  *nc;

   uint idx;

   int offsets[] = {

     0x0,

     0xfffffff0,

     0x7ffffff0,

     0x80000000,

     0x20,

     0x4000,

   };

   VM_Version::allow_all();

   a->call( a->pc(), relocInfo::none );

   a->delayed()->nop();

   nc = nativeCall_at( cb.code_begin() );

   nc->print();

   nc = nativeCall_overwriting_at( nc->next_instruction_address() );

   for (idx = 0; idx < ARRAY_SIZE(offsets); idx++) {

     nc->set_destination( cb.code_begin() + offsets[idx] );

     assert(nc->destination() == (cb.code_begin() + offsets[idx]), "check unit test");

     nc->print();

   }

   nc = nativeCall_before( cb.code_begin() + 8 );

   nc->print();

   VM_Version::revert();

 #endif

 }

 // End code for unit testing implementation of NativeCall class

 //-------------------------------------------------------------------

 #ifdef _LP64

 void NativeFarCall::set_destination(address dest) {

   // Address materialized in the instruction stream, so nothing to do.

   return;

 #if 0 // What we'd do if we really did want to change the destination

   if (destination() == dest) {

     return;

   }

   ResourceMark rm;

   CodeBuffer buf(addr_at(0), instruction_size + 1);

   MacroAssembler* _masm = new MacroAssembler(&buf);

   // Generate the new sequence

   Address(O7, dest);

   _masm->jumpl_to(dest, O7);

   ICache::invalidate_range(addr_at(0), instruction_size );

 #endif

 }

 void NativeFarCall::verify() {

   // make sure code pattern is actually a jumpl_to instruction

   assert((int)instruction_size == (int)NativeJump::instruction_size, "same as jump_to");

   assert((int)jmpl_offset == (int)NativeMovConstReg::add_offset, "sethi size ok");

   nativeJump_at(addr_at(0))->verify();

 }

 bool NativeFarCall::is_call_at(address instr) {

   return nativeInstruction_at(instr)->is_sethi();

 }

 void NativeFarCall::print() {

   tty->print_cr(INTPTR_FORMAT ": call " INTPTR_FORMAT, instruction_address(), destination());

 }

 bool NativeFarCall::destination_is_compiled_verified_entry_point() {

   nmethod* callee = CodeCache::find_nmethod(destination());

   if (callee == NULL) {

     return false;

   } else {

     return destination() == callee->verified_entry_point();

   }

 }

 // MT-safe patching of a far call.

 void NativeFarCall::replace_mt_safe(address instr_addr, address code_buffer) {

   Unimplemented();

 }

 // Code for unit testing implementation of NativeFarCall class

 void NativeFarCall::test() {

   Unimplemented();

 }

 // End code for unit testing implementation of NativeFarCall class

 #endif // _LP64

 //-------------------------------------------------------------------

 void NativeMovConstReg::verify() {

   NativeInstruction::verify();

   // make sure code pattern is actually a "set_oop" synthetic instruction

   // see MacroAssembler::set_oop()

   int i0 = long_at(sethi_offset);

   int i1 = long_at(add_offset);

   // verify the pattern "sethi %hi22(imm), reg ;  add reg, %lo10(imm), reg"

   Register rd = inv_rd(i0);

 #ifndef _LP64

   if (!(is_op2(i0, Assembler::sethi_op2) && rd != G0 &&

         is_op3(i1, Assembler::add_op3, Assembler::arith_op) &&

         inv_immed(i1) && (unsigned)get_simm13(i1) < (1 << 10) &&

         rd == inv_rs1(i1) && rd == inv_rd(i1))) {

     fatal("not a set_oop");

   }

 #else

   if (!is_op2(i0, Assembler::sethi_op2) && rd != G0 ) {

     fatal("not a set_oop");

   }

 #endif

 }

 void NativeMovConstReg::print() {

   tty->print_cr(INTPTR_FORMAT ": mov reg, " INTPTR_FORMAT, instruction_address(), data());

 }

 #ifdef _LP64

 intptr_t NativeMovConstReg::data() const {

   return data64(addr_at(sethi_offset), long_at(add_offset));

 }

 #else

 intptr_t NativeMovConstReg::data() const {

   return data32(long_at(sethi_offset), long_at(add_offset));

 }

 #endif

 void NativeMovConstReg::set_data(intptr_t x) {

 #ifdef _LP64

   set_data64_sethi(addr_at(sethi_offset), x);

 #else

   set_long_at(sethi_offset, set_data32_sethi(  long_at(sethi_offset), x));

 #endif

   set_long_at(add_offset,   set_data32_simm13( long_at(add_offset),   x));

   // also store the value into an oop_Relocation cell, if any

   CodeBlob* nm = CodeCache::find_blob(instruction_address());

   if (nm != NULL) {

     RelocIterator iter(nm, instruction_address(), next_instruction_address());

     oop* oop_addr = NULL;

     while (iter.next()) {

       if (iter.type() == relocInfo::oop_type) {

         oop_Relocation *r = iter.oop_reloc();

         if (oop_addr == NULL) {

           oop_addr = r->oop_addr();

           *oop_addr = (oop)x;

         } else {

           assert(oop_addr == r->oop_addr(), "must be only one set-oop here");

         }

       }

     }

   }

 }

 // Code for unit testing implementation of NativeMovConstReg class

 void NativeMovConstReg::test() {

 #ifdef ASSERT

   ResourceMark rm;

   CodeBuffer cb("test", 100, 100);

   MacroAssembler* a = new MacroAssembler(&cb);

   NativeMovConstReg* nm;

   uint idx;

   int offsets[] = {

     0x0,

     0x7fffffff,

     0x80000000,

     0xffffffff,

     0x20,

     4096,

     4097,

   };

   VM_Version::allow_all();

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none);

   a->add(I3, low10(0xaaaabbbb), I3);

   a->sethi(0xccccdddd, O2, true, RelocationHolder::none);

   a->add(O2, low10(0xccccdddd), O2);

   nm = nativeMovConstReg_at( cb.code_begin() );

   nm->print();

   nm = nativeMovConstReg_at( nm->next_instruction_address() );

   for (idx = 0; idx < ARRAY_SIZE(offsets); idx++) {

     nm->set_data( offsets[idx] );

     assert(nm->data() == offsets[idx], "check unit test");

   }

   nm->print();

   VM_Version::revert();

 #endif

 }

 // End code for unit testing implementation of NativeMovConstReg class

 //-------------------------------------------------------------------

 void NativeMovConstRegPatching::verify() {

   NativeInstruction::verify();

   // Make sure code pattern is sethi/nop/add.

   int i0 = long_at(sethi_offset);

   int i1 = long_at(nop_offset);

   int i2 = long_at(add_offset);

   assert((int)nop_offset == (int)NativeMovConstReg::add_offset, "sethi size ok");

   // Verify the pattern "sethi %hi22(imm), reg; nop; add reg, %lo10(imm), reg"

   // The casual reader should note that on Sparc a nop is a special case if sethi

   // in which the destination register is %g0.

   Register rd0 = inv_rd(i0);

   Register rd1 = inv_rd(i1);

   if (!(is_op2(i0, Assembler::sethi_op2) && rd0 != G0 &&

         is_op2(i1, Assembler::sethi_op2) && rd1 == G0 &&        // nop is a special case of sethi

         is_op3(i2, Assembler::add_op3, Assembler::arith_op) &&

         inv_immed(i2) && (unsigned)get_simm13(i2) < (1 << 10) &&

         rd0 == inv_rs1(i2) && rd0 == inv_rd(i2))) {

     fatal("not a set_oop");

   }

 }

 void NativeMovConstRegPatching::print() {

   tty->print_cr(INTPTR_FORMAT ": mov reg, " INTPTR_FORMAT, instruction_address(), data());

 }

 int NativeMovConstRegPatching::data() const {

 #ifdef _LP64

   return data64(addr_at(sethi_offset), long_at(add_offset));

 #else

   return data32(long_at(sethi_offset), long_at(add_offset));

 #endif

 }

 void NativeMovConstRegPatching::set_data(int x) {

 #ifdef _LP64

   set_data64_sethi(addr_at(sethi_offset), x);

 #else

   set_long_at(sethi_offset, set_data32_sethi(long_at(sethi_offset), x));

 #endif

   set_long_at(add_offset, set_data32_simm13(long_at(add_offset), x));

   // also store the value into an oop_Relocation cell, if any

   CodeBlob* nm = CodeCache::find_blob(instruction_address());

   if (nm != NULL) {

     RelocIterator iter(nm, instruction_address(), next_instruction_address());

     oop* oop_addr = NULL;

     while (iter.next()) {

       if (iter.type() == relocInfo::oop_type) {

         oop_Relocation *r = iter.oop_reloc();

         if (oop_addr == NULL) {

           oop_addr = r->oop_addr();

           *oop_addr = (oop)x;

         } else {

           assert(oop_addr == r->oop_addr(), "must be only one set-oop here");

         }

       }

     }

   }

 }

 // Code for unit testing implementation of NativeMovConstRegPatching class

 void NativeMovConstRegPatching::test() {

 #ifdef ASSERT

   ResourceMark rm;

   CodeBuffer cb("test", 100, 100);

   MacroAssembler* a = new MacroAssembler(&cb);

   NativeMovConstRegPatching* nm;

   uint idx;

   int offsets[] = {

     0x0,

     0x7fffffff,

     0x80000000,

     0xffffffff,

     0x20,

     4096,

     4097,

   };

   VM_Version::allow_all();

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none);

   a->nop();

   a->add(I3, low10(0xaaaabbbb), I3);

   a->sethi(0xccccdddd, O2, true, RelocationHolder::none);

   a->nop();

   a->add(O2, low10(0xccccdddd), O2);

   nm = nativeMovConstRegPatching_at( cb.code_begin() );

   nm->print();

   nm = nativeMovConstRegPatching_at( nm->next_instruction_address() );

   for (idx = 0; idx < ARRAY_SIZE(offsets); idx++) {

     nm->set_data( offsets[idx] );

     assert(nm->data() == offsets[idx], "check unit test");

   }

   nm->print();

   VM_Version::revert();

 #endif // ASSERT

 }

 // End code for unit testing implementation of NativeMovConstRegPatching class

 //-------------------------------------------------------------------

 void NativeMovRegMem::copy_instruction_to(address new_instruction_address) {

   Untested("copy_instruction_to");

   int instruction_size = next_instruction_address() - instruction_address();

   for (int i = 0; i < instruction_size; i += BytesPerInstWord) {

     *(int*)(new_instruction_address + i) = *(int*)(address(this) + i);

   }

 }

 void NativeMovRegMem::verify() {

   NativeInstruction::verify();

   // make sure code pattern is actually a "ld" or "st" of some sort.

   int i0 = long_at(0);

   int op3 = inv_op3(i0);

   assert((int)add_offset == NativeMovConstReg::add_offset, "sethi size ok");

   if (!(is_op(i0, Assembler::ldst_op) &&

         inv_immed(i0) &&

         0 != (op3 < op3_ldst_int_limit

          ? (1 <<  op3                      ) & (op3_mask_ld  | op3_mask_st)

          : (1 << (op3 - op3_ldst_int_limit)) & (op3_mask_ldf | op3_mask_stf))))

   {

     int i1 = long_at(ldst_offset);

     Register rd = inv_rd(i0);

     op3 = inv_op3(i1);

     if (!is_op(i1, Assembler::ldst_op) && rd == inv_rs2(i1) &&

          0 != (op3 < op3_ldst_int_limit

               ? (1 <<  op3                      ) & (op3_mask_ld  | op3_mask_st)

                : (1 << (op3 - op3_ldst_int_limit)) & (op3_mask_ldf | op3_mask_stf))) {

       fatal("not a ld* or st* op");

     }

   }

 }

 void NativeMovRegMem::print() {

   if (is_immediate()) {

     tty->print_cr(INTPTR_FORMAT ": mov reg, [reg + %x]", instruction_address(), offset());

   } else {

     tty->print_cr(INTPTR_FORMAT ": mov reg, [reg + reg]", instruction_address());

   }

 }

 // Code for unit testing implementation of NativeMovRegMem class

 void NativeMovRegMem::test() {

 #ifdef ASSERT

   ResourceMark rm;

   CodeBuffer cb("test", 1000, 1000);

   MacroAssembler* a = new MacroAssembler(&cb);

   NativeMovRegMem* nm;

   uint idx = 0;

   uint idx1;

   int offsets[] = {

     0x0,

     0xffffffff,

     0x7fffffff,

     0x80000000,

     4096,

     4097,

     0x20,

     0x4000,

   };

   VM_Version::allow_all();

   a->ldsw( G5, low10(0xffffffff), G4 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->add(I3, low10(0xaaaabbbb), I3);

   a->ldsw( G5, I3, G4 ); idx++;

   a->ldsb( G5, low10(0xffffffff), G4 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->add(I3, low10(0xaaaabbbb), I3);

   a->ldsb( G5, I3, G4 ); idx++;

   a->ldsh( G5, low10(0xffffffff), G4 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->add(I3, low10(0xaaaabbbb), I3);

   a->ldsh( G5, I3, G4 ); idx++;

   a->lduw( G5, low10(0xffffffff), G4 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->add(I3, low10(0xaaaabbbb), I3);

   a->lduw( G5, I3, G4 ); idx++;

   a->ldub( G5, low10(0xffffffff), G4 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->add(I3, low10(0xaaaabbbb), I3);

   a->ldub( G5, I3, G4 ); idx++;

   a->lduh( G5, low10(0xffffffff), G4 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->add(I3, low10(0xaaaabbbb), I3);

   a->lduh( G5, I3, G4 ); idx++;

   a->ldx( G5, low10(0xffffffff), G4 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->add(I3, low10(0xaaaabbbb), I3);

   a->ldx( G5, I3, G4 ); idx++;

   a->ldd( G5, low10(0xffffffff), G4 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->add(I3, low10(0xaaaabbbb), I3);

   a->ldd( G5, I3, G4 ); idx++;

   a->ldf( FloatRegisterImpl::D, O2, -1, F14 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->add(I3, low10(0xaaaabbbb), I3);

   a->ldf( FloatRegisterImpl::S, O0, I3, F15 ); idx++;

   a->stw( G5, G4, low10(0xffffffff) ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->add(I3, low10(0xaaaabbbb), I3);

   a->stw( G5, G4, I3 ); idx++;

   a->stb( G5, G4, low10(0xffffffff) ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->add(I3, low10(0xaaaabbbb), I3);

   a->stb( G5, G4, I3 ); idx++;

   a->sth( G5, G4, low10(0xffffffff) ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->add(I3, low10(0xaaaabbbb), I3);

   a->sth( G5, G4, I3 ); idx++;

   a->stx( G5, G4, low10(0xffffffff) ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->add(I3, low10(0xaaaabbbb), I3);

   a->stx( G5, G4, I3 ); idx++;

   a->std( G5, G4, low10(0xffffffff) ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->add(I3, low10(0xaaaabbbb), I3);

   a->std( G5, G4, I3 ); idx++;

   a->stf( FloatRegisterImpl::S, F18, O2, -1 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->add(I3, low10(0xaaaabbbb), I3);

   a->stf( FloatRegisterImpl::S, F15, O0, I3 ); idx++;

   nm = nativeMovRegMem_at( cb.code_begin() );

   nm->print();

   nm->set_offset( low10(0) );

   nm->print();

   nm->add_offset_in_bytes( low10(0xbb) * wordSize );

   nm->print();

   while (--idx) {

     nm = nativeMovRegMem_at( nm->next_instruction_address() );

     nm->print();

     for (idx1 = 0; idx1 < ARRAY_SIZE(offsets); idx1++) {

       nm->set_offset( nm->is_immediate() ? low10(offsets[idx1]) : offsets[idx1] );

       assert(nm->offset() == (nm->is_immediate() ? low10(offsets[idx1]) : offsets[idx1]),

              "check unit test");

       nm->print();

     }

     nm->add_offset_in_bytes( low10(0xbb) * wordSize );

     nm->print();

   }

   VM_Version::revert();

 #endif // ASSERT

 }

 // End code for unit testing implementation of NativeMovRegMem class

 //--------------------------------------------------------------------------------

 void NativeMovRegMemPatching::copy_instruction_to(address new_instruction_address) {

   Untested("copy_instruction_to");

   int instruction_size = next_instruction_address() - instruction_address();

   for (int i = 0; i < instruction_size; i += wordSize) {

     *(long*)(new_instruction_address + i) = *(long*)(address(this) + i);

   }

 }

 void NativeMovRegMemPatching::verify() {

   NativeInstruction::verify();

   // make sure code pattern is actually a "ld" or "st" of some sort.

   int i0 = long_at(0);

   int op3 = inv_op3(i0);

   assert((int)nop_offset == (int)NativeMovConstReg::add_offset, "sethi size ok");

   if (!(is_op(i0, Assembler::ldst_op) &&

         inv_immed(i0) &&

         0 != (op3 < op3_ldst_int_limit

          ? (1 <<  op3                      ) & (op3_mask_ld  | op3_mask_st)

          : (1 << (op3 - op3_ldst_int_limit)) & (op3_mask_ldf | op3_mask_stf)))) {

     int i1 = long_at(ldst_offset);

     Register rd = inv_rd(i0);

     op3 = inv_op3(i1);

     if (!is_op(i1, Assembler::ldst_op) && rd == inv_rs2(i1) &&

          0 != (op3 < op3_ldst_int_limit

               ? (1 <<  op3                      ) & (op3_mask_ld  | op3_mask_st)

               : (1 << (op3 - op3_ldst_int_limit)) & (op3_mask_ldf | op3_mask_stf))) {

       fatal("not a ld* or st* op");

     }

   }

 }

 void NativeMovRegMemPatching::print() {

   if (is_immediate()) {

     tty->print_cr(INTPTR_FORMAT ": mov reg, [reg + %x]", instruction_address(), offset());

   } else {

     tty->print_cr(INTPTR_FORMAT ": mov reg, [reg + reg]", instruction_address());

   }

 }

 // Code for unit testing implementation of NativeMovRegMemPatching class

 void NativeMovRegMemPatching::test() {

 #ifdef ASSERT

   ResourceMark rm;

   CodeBuffer cb("test", 1000, 1000);

   MacroAssembler* a = new MacroAssembler(&cb);

   NativeMovRegMemPatching* nm;

   uint idx = 0;

   uint idx1;

   int offsets[] = {

     0x0,

     0xffffffff,

     0x7fffffff,

     0x80000000,

     4096,

     4097,

     0x20,

     0x4000,

   };

   VM_Version::allow_all();

   a->ldsw( G5, low10(0xffffffff), G4 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->nop(); a->add(I3, low10(0xaaaabbbb), I3);

   a->ldsw( G5, I3, G4 ); idx++;

   a->ldsb( G5, low10(0xffffffff), G4 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->nop(); a->add(I3, low10(0xaaaabbbb), I3);

   a->ldsb( G5, I3, G4 ); idx++;

   a->ldsh( G5, low10(0xffffffff), G4 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->nop(); a->add(I3, low10(0xaaaabbbb), I3);

   a->ldsh( G5, I3, G4 ); idx++;

   a->lduw( G5, low10(0xffffffff), G4 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->nop(); a->add(I3, low10(0xaaaabbbb), I3);

   a->lduw( G5, I3, G4 ); idx++;

   a->ldub( G5, low10(0xffffffff), G4 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->nop(); a->add(I3, low10(0xaaaabbbb), I3);

   a->ldub( G5, I3, G4 ); idx++;

   a->lduh( G5, low10(0xffffffff), G4 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->nop(); a->add(I3, low10(0xaaaabbbb), I3);

   a->lduh( G5, I3, G4 ); idx++;

   a->ldx( G5, low10(0xffffffff), G4 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->nop(); a->add(I3, low10(0xaaaabbbb), I3);

   a->ldx( G5, I3, G4 ); idx++;

   a->ldd( G5, low10(0xffffffff), G4 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->nop(); a->add(I3, low10(0xaaaabbbb), I3);

   a->ldd( G5, I3, G4 ); idx++;

   a->ldf( FloatRegisterImpl::D, O2, -1, F14 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->nop(); a->add(I3, low10(0xaaaabbbb), I3);

   a->ldf( FloatRegisterImpl::S, O0, I3, F15 ); idx++;

   a->stw( G5, G4, low10(0xffffffff) ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->nop(); a->add(I3, low10(0xaaaabbbb), I3);

   a->stw( G5, G4, I3 ); idx++;

   a->stb( G5, G4, low10(0xffffffff) ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->nop(); a->add(I3, low10(0xaaaabbbb), I3);

   a->stb( G5, G4, I3 ); idx++;

   a->sth( G5, G4, low10(0xffffffff) ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->nop(); a->add(I3, low10(0xaaaabbbb), I3);

   a->sth( G5, G4, I3 ); idx++;

   a->stx( G5, G4, low10(0xffffffff) ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->nop(); a->add(I3, low10(0xaaaabbbb), I3);

   a->stx( G5, G4, I3 ); idx++;

   a->std( G5, G4, low10(0xffffffff) ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->nop(); a->add(I3, low10(0xaaaabbbb), I3);

   a->std( G5, G4, I3 ); idx++;

   a->stf( FloatRegisterImpl::S, F18, O2, -1 ); idx++;

   a->sethi(0xaaaabbbb, I3, true, RelocationHolder::none); a->nop(); a->add(I3, low10(0xaaaabbbb), I3);

   a->stf( FloatRegisterImpl::S, F15, O0, I3 ); idx++;

   nm = nativeMovRegMemPatching_at( cb.code_begin() );

   nm->print();

   nm->set_offset( low10(0) );

   nm->print();

   nm->add_offset_in_bytes( low10(0xbb) * wordSize );

   nm->print();

   while (--idx) {

     nm = nativeMovRegMemPatching_at( nm->next_instruction_address() );

     nm->print();

     for (idx1 = 0; idx1 < ARRAY_SIZE(offsets); idx1++) {

       nm->set_offset( nm->is_immediate() ? low10(offsets[idx1]) : offsets[idx1] );

       assert(nm->offset() == (nm->is_immediate() ? low10(offsets[idx1]) : offsets[idx1]),

              "check unit test");

       nm->print();

     }

     nm->add_offset_in_bytes( low10(0xbb) * wordSize );

     nm->print();

   }

   VM_Version::revert();

 #endif // ASSERT

 }

 // End code for unit testing implementation of NativeMovRegMemPatching class

 //--------------------------------------------------------------------------------

 void NativeJump::verify() {

   NativeInstruction::verify();

   int i0 = long_at(sethi_offset);

   int i1 = long_at(jmpl_offset);

   assert((int)jmpl_offset == (int)NativeMovConstReg::add_offset, "sethi size ok");

   // verify the pattern "sethi %hi22(imm), treg ;  jmpl treg, %lo10(imm), lreg"

   Register rd = inv_rd(i0);

 #ifndef _LP64

   if (!(is_op2(i0, Assembler::sethi_op2) && rd != G0 &&

         (is_op3(i1, Assembler::jmpl_op3, Assembler::arith_op) ||

         (TraceJumps && is_op3(i1, Assembler::add_op3, Assembler::arith_op))) &&

         inv_immed(i1) && (unsigned)get_simm13(i1) < (1 << 10) &&

         rd == inv_rs1(i1))) {

     fatal("not a jump_to instruction");

   }

 #else

   // In LP64, the jump instruction location varies for non relocatable

   // jumps, for example is could be sethi, xor, jmp instead of the

   // 7 instructions for sethi.  So let's check sethi only.

   if (!is_op2(i0, Assembler::sethi_op2) && rd != G0 ) {

     fatal("not a jump_to instruction");

   }

 #endif

 }

 void NativeJump::print() {

   tty->print_cr(INTPTR_FORMAT ": jmpl reg, " INTPTR_FORMAT, instruction_address(), jump_destination());

 }

 // Code for unit testing implementation of NativeJump class

 void NativeJump::test() {

 #ifdef ASSERT

   ResourceMark rm;

   CodeBuffer cb("test", 100, 100);

   MacroAssembler* a = new MacroAssembler(&cb);

   NativeJump* nj;

   uint idx;

   int offsets[] = {

     0x0,

     0xffffffff,

     0x7fffffff,

     0x80000000,

     4096,

     4097,

     0x20,

     0x4000,

   };

   VM_Version::allow_all();

   a->sethi(0x7fffbbbb, I3, true, RelocationHolder::none);

   a->jmpl(I3, low10(0x7fffbbbb), G0, RelocationHolder::none);

   a->delayed()->nop();

   a->sethi(0x7fffbbbb, I3, true, RelocationHolder::none);

   a->jmpl(I3, low10(0x7fffbbbb), L3, RelocationHolder::none);

   a->delayed()->nop();

   nj = nativeJump_at( cb.code_begin() );

   nj->print();

   nj = nativeJump_at( nj->next_instruction_address() );

   for (idx = 0; idx < ARRAY_SIZE(offsets); idx++) {

     nj->set_jump_destination( nj->instruction_address() + offsets[idx] );

     assert(nj->jump_destination() == (nj->instruction_address() + offsets[idx]), "check unit test");

     nj->print();

   }

   VM_Version::revert();

 #endif // ASSERT

 }

 // End code for unit testing implementation of NativeJump class

 void NativeJump::insert(address code_pos, address entry) {

   Unimplemented();

 }

 // MT safe inserting of a jump over an unknown instruction sequence (used by nmethod::makeZombie)

 // The problem: jump_to <dest> is a 3-word instruction (including its delay slot).

 // Atomic write can be only with 1 word.

 void NativeJump::patch_verified_entry(address entry, address verified_entry, address dest) {

   // Here's one way to do it:  Pre-allocate a three-word jump sequence somewhere

   // in the header of the nmethod, within a short branch's span of the patch point.

   // Set up the jump sequence using NativeJump::insert, and then use an annulled

   // unconditional branch at the target site (an atomic 1-word update).

   // Limitations:  You can only patch nmethods, with any given nmethod patched at

   // most once, and the patch must be in the nmethod's header.

   // It's messy, but you can ask the CodeCache for the nmethod containing the

   // target address.

   // %%%%% For now, do something MT-stupid:

   ResourceMark rm;

   int code_size = 1 * BytesPerInstWord;

   CodeBuffer cb(verified_entry, code_size + 1);

   MacroAssembler* a = new MacroAssembler(&cb);

   if (VM_Version::v9_instructions_work()) {

     a->ldsw(G0, 0, O7); // "ld" must agree with code in the signal handler

   } else {

     a->lduw(G0, 0, O7); // "ld" must agree with code in the signal handler

   }

   ICache::invalidate_range(verified_entry, code_size);

 }

 void NativeIllegalInstruction::insert(address code_pos) {

   NativeIllegalInstruction* nii = (NativeIllegalInstruction*) nativeInstruction_at(code_pos);

   nii->set_long_at(0, illegal_instruction());

 }

 static int illegal_instruction_bits = 0;

 int NativeInstruction::illegal_instruction() {

   if (illegal_instruction_bits == 0) {

     ResourceMark rm;

     char buf[40];

     CodeBuffer cbuf((address)&buf[0], 20);

     MacroAssembler* a = new MacroAssembler(&cbuf);

     address ia = a->pc();

     a->trap(ST_RESERVED_FOR_USER_0 + 1);

     int bits = *(int*)ia;

     assert(is_op3(bits, Assembler::trap_op3, Assembler::arith_op), "bad instruction");

     illegal_instruction_bits = bits;

     assert(illegal_instruction_bits != 0, "oops");

   }

   return illegal_instruction_bits;

 }

 static int ic_miss_trap_bits = 0;

 bool NativeInstruction::is_ic_miss_trap() {

   if (ic_miss_trap_bits == 0) {

     ResourceMark rm;

     char buf[40];

     CodeBuffer cbuf((address)&buf[0], 20);

     MacroAssembler* a = new MacroAssembler(&cbuf);

     address ia = a->pc();

     a->trap(Assembler::notEqual, Assembler::ptr_cc, G0, ST_RESERVED_FOR_USER_0 + 2);

     int bits = *(int*)ia;

     assert(is_op3(bits, Assembler::trap_op3, Assembler::arith_op), "bad instruction");

     ic_miss_trap_bits = bits;

     assert(ic_miss_trap_bits != 0, "oops");

   }

   return long_at(0) == ic_miss_trap_bits;

 }

 bool NativeInstruction::is_illegal() {

   if (illegal_instruction_bits == 0) {

     return false;

   }

   return long_at(0) == illegal_instruction_bits;

 }

 void NativeGeneralJump::verify() {

   assert(((NativeInstruction *)this)->is_jump() ||

          ((NativeInstruction *)this)->is_cond_jump(), "not a general jump instruction");

 }

 void NativeGeneralJump::insert_unconditional(address code_pos, address entry) {

   Assembler::Condition condition = Assembler::always;

   int x = Assembler::op2(Assembler::br_op2) | Assembler::annul(false) |

     Assembler::cond(condition) | Assembler::wdisp((intptr_t)entry, (intptr_t)code_pos, 22);

   NativeGeneralJump* ni = (NativeGeneralJump*) nativeInstruction_at(code_pos);

   ni->set_long_at(0, x);

 }

 // MT-safe patching of a jmp instruction (and following word).

 // First patches the second word, and then atomicly replaces

 // the first word with the first new instruction word.

 // Other processors might briefly see the old first word

 // followed by the new second word.  This is OK if the old

 // second word is harmless, and the new second word may be

 // harmlessly executed in the delay slot of the call.

 void NativeGeneralJump::replace_mt_safe(address instr_addr, address code_buffer) {

    assert(Patching_lock->is_locked() ||

          SafepointSynchronize::is_at_safepoint(), "concurrent code patching");

    assert (instr_addr != NULL, "illegal address for code patching");

    NativeGeneralJump* h_jump =  nativeGeneralJump_at (instr_addr); // checking that it is a call

    assert(NativeGeneralJump::instruction_size == 8, "wrong instruction size; must be 8");

    int i0 = ((int*)code_buffer)[0];

    int i1 = ((int*)code_buffer)[1];

    int* contention_addr = (int*) h_jump->addr_at(1*BytesPerInstWord);

    assert(inv_op(*contention_addr) == Assembler::arith_op ||

           *contention_addr == nop_instruction() || !VM_Version::v9_instructions_work(),

           "must not interfere with original call");

    // The set_long_at calls do the ICacheInvalidate so we just need to do them in reverse order

    h_jump->set_long_at(1*BytesPerInstWord, i1);

    h_jump->set_long_at(0*BytesPerInstWord, i0);

    // NOTE:  It is possible that another thread T will execute

    // only the second patched word.

    // In other words, since the original instruction is this

    //    jmp patching_stub; nop                    (NativeGeneralJump)

    // and the new sequence from the buffer is this:

    //    sethi %hi(K), %r; add %r, %lo(K), %r      (NativeMovConstReg)

    // what T will execute is this:

    //    jmp patching_stub; add %r, %lo(K), %r

    // thereby putting garbage into %r before calling the patching stub.

    // This is OK, because the patching stub ignores the value of %r.

    // Make sure the first-patched instruction, which may co-exist

    // briefly with the call, will do something harmless.

    assert(inv_op(*contention_addr) == Assembler::arith_op ||

           *contention_addr == nop_instruction() || !VM_Version::v9_instructions_work(),

           "must not interfere with original call");

 }