ScriptableAssembler (SASM) syntax example

test.c

/*
** Multi line comment
*/

// Single line commit

PE_SCN_CNT_CODE = 0x00000020
PE_SCN_CNT_INITIALIZED_DATA = 0x00000040
PE_SCN_CNT_UNINITIALIZED_DATA = 0x00000080
PE_SCN_MEM_EXECUTE = 0x20000000
PE_SCN_MEM_READ = 0x40000000
PE_SCN_MEM_WRITE = 0x80000000

.target pe32 /* comment */ (imagebase = 0x400000, codebase = 0x1000)
.cpu all
.bits 32

.script {
  
  Assembler.defineFunction("replaceEAXwithEBX", function(args, content){    
    Assembler.parse(content.replace("eax","ebx"));
  });
  
  Assembler.defineMacro("invoke", function(){
    // 32-bit x86 stdcall invoke
    var functionName = arguments[0];
    for(var i = arguments.length - 1; i > 0; i--){
      var functionParameter = arguments[i];
      Assembler.parse("push "+functionParameter);
    }
    Assembler.parse("call dword ptr ["+functionName+"]");
  });
  
};

.macro oldSchoolMacro(a0, a1){
  .local label0
  cmp a0, a1
  jz label0
   xor a0, a0
  label0: 
}

.section(".text", PE_SCN_CNT_CODE | PE_SCN_MEM_READ | PE_SCN_MEM_EXECUTE){
  .entrypoint
  invoke MessageBox, byte 0, dword Title, dword Text, byte 0
  invoke ExitProcess, byte 0

  oldSchoolMacro eax, ebx

  // statement terminator semicolons like in javascript incl. automatic semicolon insertion for
  // oldschool semicolon-free x86 assembler coding
  inc eax; dec eax; ret
  
  // Support for modern instruction sets
  vex2 vcomisd xmm0,xmm1
  vex3 vcomisd xmm0,xmm1
  evex vcomisd xmm0,xmm1
  .bits 64
  vaddps zmm30{k7}{z},zmm29,zmm28  
  .bits 32
  
  // Support for 64-bit x86 assembler code
  .bits 64
  mov r9,rax
  .bits 32
  
  // Support for 16-bit x86 assembler code
  .bits 16
  mov word ptr [bx+di],ax
  .bits 32
  
};

.section(".data",  PE_SCN_CNT_INITIALIZED_DATA | PE_SCN_MEM_READ | PE_SCN_MEM_WRITE){
  Title: db "Test", 0 // bla
  Text: db "Hello world!\0"
  
  // Big integer arithmetics (internally up to 1024-bit)
  dz (0x1234567812345678123456781234567812345678 * 2) - 1
  
  // Big float support (up to 512-bit, but only parsing only without arithmetics)
  dz 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679
   
  // 80-bit Packed BCD support
  dt 0p1337
  
  // db / resb = byte (8-bit)
  // dw / resw = word (16-bit)
  // dd / resd = dword (32-bit)
  // ddq / resdq = dqword (64-bit)
  // dt / rest = tword (80-bit)
  // dq / resq / do / reso = qword / oword / xmmword (128-bit)
  // dy / resy = yword / ymmword (256-bit)
  // dz / resz = zword / zmmword (512-bit)
   
};

.section(".bss", PE_SCN_CNT_UNINITIALIZED_DATA | PE_SCN_MEM_READ | PE_SCN_MEM_WRITE, 65536){
  TestData2: db 0, 0
}

.library("kernel32.dll"){
  ExitProcess = "ExitProcess"
  GetTickCount = "GetTickCount"   
}; 
  
.library("user32.dll"){
  MessageBox = "MessageBoxA"
};