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1 //
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2 // Copyright 1999-2008 Sun Microsystems, Inc. All Rights Reserved.
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3 // DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 //
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5 // This code is free software; you can redistribute it and/or modify it
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6 // under the terms of the GNU General Public License version 2 only, as
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7 // published by the Free Software Foundation.
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8 //
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9 // This code is distributed in the hope that it will be useful, but WITHOUT
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10 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 // version 2 for more details (a copy is included in the LICENSE file that
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13 // accompanied this code).
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14 //
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15 // You should have received a copy of the GNU General Public License version
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16 // 2 along with this work; if not, write to the Free Software Foundation,
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17 // Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 //
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19 // Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 // CA 95054 USA or visit www.sun.com if you need additional information or
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21 // have any questions.
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22 //
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23 //
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24
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25 // X86 Linux Architecture Description File
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26
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27 //----------OS-DEPENDENT ENCODING BLOCK-----------------------------------------------------
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28 // This block specifies the encoding classes used by the compiler to output
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29 // byte streams. Encoding classes generate functions which are called by
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30 // Machine Instruction Nodes in order to generate the bit encoding of the
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31 // instruction. Operands specify their base encoding interface with the
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32 // interface keyword. There are currently supported four interfaces,
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33 // REG_INTER, CONST_INTER, MEMORY_INTER, & COND_INTER. REG_INTER causes an
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34 // operand to generate a function which returns its register number when
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35 // queried. CONST_INTER causes an operand to generate a function which
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36 // returns the value of the constant when queried. MEMORY_INTER causes an
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37 // operand to generate four functions which return the Base Register, the
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38 // Index Register, the Scale Value, and the Offset Value of the operand when
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39 // queried. COND_INTER causes an operand to generate six functions which
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40 // return the encoding code (ie - encoding bits for the instruction)
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41 // associated with each basic boolean condition for a conditional instruction.
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42 // Instructions specify two basic values for encoding. They use the
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43 // ins_encode keyword to specify their encoding class (which must be one of
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44 // the class names specified in the encoding block), and they use the
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45 // opcode keyword to specify, in order, their primary, secondary, and
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46 // tertiary opcode. Only the opcode sections which a particular instruction
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47 // needs for encoding need to be specified.
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48 encode %{
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49 // Build emit functions for each basic byte or larger field in the intel
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50 // encoding scheme (opcode, rm, sib, immediate), and call them from C++
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51 // code in the enc_class source block. Emit functions will live in the
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52 // main source block for now. In future, we can generalize this by
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53 // adding a syntax that specifies the sizes of fields in an order,
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54 // so that the adlc can build the emit functions automagically
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55
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56 enc_class linux_tlsencode (eRegP dst) %{
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57 Register dstReg = as_Register($dst$$reg);
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58 MacroAssembler* masm = new MacroAssembler(&cbuf);
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59 masm->get_thread(dstReg);
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60 %}
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61
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62 enc_class linux_breakpoint %{
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63 MacroAssembler* masm = new MacroAssembler(&cbuf);
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64 masm->call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint)));
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65 %}
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66
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67 enc_class call_epilog %{
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68 if( VerifyStackAtCalls ) {
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69 // Check that stack depth is unchanged: find majik cookie on stack
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70 int framesize = ra_->reg2offset_unchecked(OptoReg::add(ra_->_matcher._old_SP,-3*VMRegImpl::slots_per_word));
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71 if(framesize >= 128) {
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72 emit_opcode(cbuf, 0x81); // cmp [esp+0],0xbadb1ood
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73 emit_d8(cbuf,0xBC);
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74 emit_d8(cbuf,0x24);
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75 emit_d32(cbuf,framesize); // Find majik cookie from ESP
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76 emit_d32(cbuf, 0xbadb100d);
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77 }
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78 else {
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79 emit_opcode(cbuf, 0x81); // cmp [esp+0],0xbadb1ood
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80 emit_d8(cbuf,0x7C);
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81 emit_d8(cbuf,0x24);
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82 emit_d8(cbuf,framesize); // Find majik cookie from ESP
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83 emit_d32(cbuf, 0xbadb100d);
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84 }
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85 // jmp EQ around INT3
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86 // QQQ TODO
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87 const int jump_around = 5; // size of call to breakpoint, 1 for CC
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88 emit_opcode(cbuf,0x74);
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89 emit_d8(cbuf, jump_around);
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90 // QQQ temporary
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91 emit_break(cbuf);
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92 // Die if stack mismatch
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93 // emit_opcode(cbuf,0xCC);
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94 }
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95 %}
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96
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97 %}
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98
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99 // INSTRUCTIONS -- Platform dependent
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100
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101 //----------OS and Locking Instructions----------------------------------------
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102
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103 // This name is KNOWN by the ADLC and cannot be changed.
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104 // The ADLC forces a 'TypeRawPtr::BOTTOM' output type
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105 // for this guy.
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420
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106 instruct tlsLoadP(eRegP dst, eFlagsReg cr) %{
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107 match(Set dst (ThreadLocal));
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108 effect(DEF dst, KILL cr);
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109
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420
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110 format %{ "MOV $dst, Thread::current()" %}
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111 ins_encode( linux_tlsencode(dst) );
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112 ins_pipe( ialu_reg_fat );
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113 %}
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114
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420
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115 instruct TLS(eRegP dst) %{
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116 match(Set dst (ThreadLocal));
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117
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118 expand %{
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119 tlsLoadP(dst);
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120 %}
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121 %}
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122
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123 // Die now
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124 instruct ShouldNotReachHere( )
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125 %{
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126 match(Halt);
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127
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128 // Use the following format syntax
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129 format %{ "INT3 ; ShouldNotReachHere" %}
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130 // QQQ TODO for now call breakpoint
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131 // opcode(0xCC);
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132 // ins_encode(Opc);
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133 ins_encode(linux_breakpoint);
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134 ins_pipe( pipe_slow );
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135 %}
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136
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137
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138
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139 // Platform dependent source
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140
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141 source %{
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142
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143 // emit an interrupt that is caught by the debugger
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144 void emit_break(CodeBuffer &cbuf) {
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145
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146 // Debugger doesn't really catch this but best we can do so far QQQ
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147 MacroAssembler* masm = new MacroAssembler(&cbuf);
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148 masm->call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint)));
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149 }
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150
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151 void MachBreakpointNode::emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const {
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152 emit_break(cbuf);
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153 }
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154
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155
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156 uint MachBreakpointNode::size(PhaseRegAlloc *ra_) const {
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157 return 5;
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158 }
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159
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160 %}
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