ghidra/Ghidra/Processors/Atmel/data/languages/avr8gcc.cspec

<?xml version="1.0" encoding="UTF-8"?>

<compiler_spec>
  <data_organization>
     <absolute_max_alignment value="1" />
     <machine_alignment value="1" />
     <default_alignment value="1" />
     <default_pointer_alignment value="1" />
     
     <pointer_size value="2" />
     <char_size value="1" />
     <wchar_size value="2" />
     
     <!-- smaller size may be used with gcc -mint8 enabled -->
     <!-- sizes do not consider use of fixed-point types -->
     <short_size value="2" />
     <integer_size value="2" />
     <long_size value="4" />
     <long_long_size value="8" />
     <float_size value="4" />
     <double_size value="4" /> <!-- non-standard -->
     <long_double_size value="4" />
     
     <size_alignment_map>
          <entry size="1" alignment="1" />
          <entry size="2" alignment="2" />
          <entry size="4" alignment="4" />
          <entry size="8" alignment="8" />
     </size_alignment_map>
  </data_organization>
  
  <global>
    <range space="code"/>
    <range space="codebyte"/>
    <range space="mem"/>
  </global>
  
  <stackpointer register="SP" space="mem" growth="negative"/>
  
  <default_proto>
    <prototype name="__stdcall" extrapop="2" stackshift="2">
      <input>
        <pentry minsize="1" maxsize="1">
          <register name="R25"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R24"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R23"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R22"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R21"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R20"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R19"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R18"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R17"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R16"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R15"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R14"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R13"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R12"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R11"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R10"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R9"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R8"/>
        </pentry>
        <pentry minsize="1" maxsize="500" align="1">
          <addr offset="3" space="stack"/>
        </pentry>
        
        <!-- In a varargs function, everything is unconditionally on the stack -->
        <rule>
          <datatype name="any"/>
          <varargs/>
          <goto_stack/>
        </rule>
        
        <!-- Arguments are passed entirely in registers if possible, else entirely on stack -->
        <!-- Odd-sized types are rounded to the next even register number for assignment -->
        <rule>
          <datatype name="any" sizes="1,3,5,7,9,11,13,15,17"/>
          <consume_extra storage="general" matchsize="false"/>
          <join stackspill="false" reversesignif="true"/>
        </rule>
        
        <rule>
          <datatype name="any"/>
          <join stackspill="false" reversesignif="true"/>
        </rule>
        
        <!-- Once any argument is passed on the stack, do not return to register allocation -->
        <rule>
          <datatype name="any"/>
          <goto_stack/>
          <consume_remaining storage="general"/>
        </rule>
      </input>
      <output>
        <pentry minsize="1" maxsize="1">
          <register name="R25"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R24"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R23"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R22"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R21"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R20"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R19"/>
        </pentry>
        <pentry minsize="1" maxsize="1">
          <register name="R18"/>
        </pentry>
        
        <!-- return value sizes are padded up to the nearest power of two -->
        <rule>
          <datatype name="any" sizes="1,3,7"/>
          <consume_extra storage="general" matchsize="false"/>
          <join reversesignif="true"/>
        </rule>
        <rule>
          <datatype name="any" minsize="5" maxsize="5"/>
          <consume_extra storage="general" matchsize="false"/>
          <consume_extra storage="general" matchsize="false"/>
          <consume_extra storage="general" matchsize="false"/>
          <join reversesignif="true"/>
        </rule> 
        <rule>
          <datatype name="any" minsize="6" maxsize="6"/>
          <consume_extra storage="general" matchsize="false"/>
          <consume_extra storage="general" matchsize="false"/>
          <join reversesignif="true"/>
        </rule>
        <rule>
          <datatype name="any"/>
          <join reversesignif="true"/>
        </rule>
      </output>
      <unaffected>
        <register name="SP"/>
        <register name="R1"/>
        <register name="R2"/>
        <register name="R3"/>
        <register name="R4"/>
        <register name="R5"/>
        <register name="R6"/>
        <register name="R7"/>
        <register name="R8"/>
        <register name="R9"/>
        <register name="R10"/>
        <register name="R11"/>
        <register name="R12"/>
        <register name="R13"/>
        <register name="R14"/>
        <register name="R15"/>
        <register name="R16"/>
        <register name="R17"/>
        <register name="Y"/> 
      </unaffected>
      <killedbycall>
          <register name="R0"/>
          <register name="R18"/>
          <register name="R19"/>
          <register name="R20"/>
          <register name="R21"/>
          <register name="R22"/>
          <register name="R23"/>
          <register name="R24"/>
          <register name="R25"/>
          <register name="Xlo"/>
          <register name="Xhi"/>
          <register name="Zlo"/>
          <register name="Zhi"/>
      </killedbycall>
    </prototype>
  </default_proto>
  
  <prototype name="__stackcall" extrapop="2" stackshift="2">
      <input>   
        <pentry minsize="1" maxsize="500" align="1">
          <addr offset="3" space="stack"/>
        </pentry>
      </input>
      <output>
        <pentry minsize="1" maxsize="2">
          <register name="R25R24"/>
        </pentry>
      </output>
      <unaffected>
        <register name="SP"/>
        <register name="R1"/>
        <register name="R2"/>
        <register name="R3"/>
        <register name="R4"/>
        <register name="R5"/>
        <register name="R6"/>
        <register name="R7"/>
        <register name="R8"/>
        <register name="R9"/>
        <register name="R10"/>
        <register name="R11"/>
        <register name="R12"/>
        <register name="R13"/>
        <register name="R14"/>
        <register name="R15"/>
        <register name="R16"/>
        <register name="R17"/>
        <register name="Y"/> 
      </unaffected>
    </prototype>
    
</compiler_spec>