//

// 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.

//

//

// 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 5;

}

%}