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 //

 // Copyright (c) 1999, 2008, 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.

 //

 //

 // X86 Linux Architecture Description File

 //----------OS-DEPENDENT ENCODING BLOCK-----------------------------------------------------

 // This block specifies the encoding classes used by the compiler to output

 // byte streams.  Encoding classes generate functions which are called by

 // Machine Instruction Nodes in order to generate the bit encoding of the

 // instruction.  Operands specify their base encoding interface with the

 // interface keyword.  There are currently supported four interfaces,

 // REG_INTER, CONST_INTER, MEMORY_INTER, & COND_INTER.  REG_INTER causes an

 // operand to generate a function which returns its register number when

 // queried.   CONST_INTER causes an operand to generate a function which

 // returns the value of the constant when queried.  MEMORY_INTER causes an

 // operand to generate four functions which return the Base Register, the

 // Index Register, the Scale Value, and the Offset Value of the operand when

 // queried.  COND_INTER causes an operand to generate six functions which

 // return the encoding code (ie - encoding bits for the instruction)

 // associated with each basic boolean condition for a conditional instruction.

 // Instructions specify two basic values for encoding.  They use the

 // ins_encode keyword to specify their encoding class (which must be one of

 // the class names specified in the encoding block), and they use the

 // opcode keyword to specify, in order, their primary, secondary, and

 // tertiary opcode.  Only the opcode sections which a particular instruction

 // needs for encoding need to be specified.

 encode %{

   // Build emit functions for each basic byte or larger field in the intel

   // encoding scheme (opcode, rm, sib, immediate), and call them from C++

   // code in the enc_class source block.  Emit functions will live in the

   // main source block for now.  In future, we can generalize this by

   // adding a syntax that specifies the sizes of fields in an order,

   // so that the adlc can build the emit functions automagically

   enc_class linux_tlsencode (eRegP dst) %{

     Register dstReg = as_Register($dst$$reg);

     MacroAssembler* masm = new MacroAssembler(&cbuf);

       masm->get_thread(dstReg);

   %}

   enc_class linux_breakpoint  %{

     MacroAssembler* masm = new MacroAssembler(&cbuf);

     masm->call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint)));

   %}

   enc_class call_epilog %{

     if( VerifyStackAtCalls ) {

       // Check that stack depth is unchanged: find majik cookie on stack

       int framesize = ra_->reg2offset_unchecked(OptoReg::add(ra_->_matcher._old_SP,-3*VMRegImpl::slots_per_word));

       if(framesize >= 128) {

         emit_opcode(cbuf, 0x81); // cmp [esp+0],0xbadb1ood

         emit_d8(cbuf,0xBC);

         emit_d8(cbuf,0x24);

         emit_d32(cbuf,framesize); // Find majik cookie from ESP

         emit_d32(cbuf, 0xbadb100d);

       }

       else {

         emit_opcode(cbuf, 0x81); // cmp [esp+0],0xbadb1ood

         emit_d8(cbuf,0x7C);

         emit_d8(cbuf,0x24);

         emit_d8(cbuf,framesize); // Find majik cookie from ESP

         emit_d32(cbuf, 0xbadb100d);

       }

       // jmp EQ around INT3

       // QQQ TODO

       const int jump_around = 5; // size of call to breakpoint, 1 for CC

       emit_opcode(cbuf,0x74);

       emit_d8(cbuf, jump_around);

       // QQQ temporary

       emit_break(cbuf);

       // Die if stack mismatch

       // emit_opcode(cbuf,0xCC);

     }

   %}

 %}

 // INSTRUCTIONS -- Platform dependent

 //----------OS and Locking Instructions----------------------------------------

 // This name is KNOWN by the ADLC and cannot be changed.

 // The ADLC forces a 'TypeRawPtr::BOTTOM' output type

 // for this guy.

 instruct tlsLoadP(eRegP dst, eFlagsReg cr) %{

   match(Set dst (ThreadLocal));

   effect(DEF dst, KILL cr);

   format %{ "MOV    $dst, Thread::current()" %}

   ins_encode( linux_tlsencode(dst) );

   ins_pipe( ialu_reg_fat );

 %}

 instruct TLS(eRegP dst) %{

   match(Set dst (ThreadLocal));

   expand %{

     tlsLoadP(dst);

   %}

 %}

 // Die now

 instruct ShouldNotReachHere( )

 %{

   match(Halt);

   // Use the following format syntax

   format %{ "INT3   ; ShouldNotReachHere" %}

   // QQQ TODO for now call breakpoint

   // opcode(0xCC);

   // ins_encode(Opc);

   ins_encode(linux_breakpoint);

   ins_pipe( pipe_slow );

 %}

 // Platform dependent source

 source %{

 // emit an interrupt that is caught by the debugger

 void emit_break(CodeBuffer &cbuf) {

   // Debugger doesn't really catch this but best we can do so far QQQ

   MacroAssembler* masm = new MacroAssembler(&cbuf);

   masm->call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint)));

 }

 void MachBreakpointNode::emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const {

   emit_break(cbuf);

 }

 uint MachBreakpointNode::size(PhaseRegAlloc *ra_) const {

   return MachNode::size(ra_);

 }

 %}