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// With the inline assembler, you can // to any C label.
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/////////////////////////////////////////////////////////////////// / // Take the absolute value of the parameter and check again. // The C code: // int y = abs ( i ) ; // if ( y >=5 ) // { // // } // else // { // // } char szAbsGTEFive[] = "abs(i) >= 5\n" ; char szAbsLTFive[] = "abs(i) < 5\n" ; __asm { MOV CMP JG EBX // is negative. NEG JE_PosNum: CMP JL LEA string // into EAX. JMP JE_DoPrintf // Go to the printf call. EBX , 5 JE_LessThan5 // Compare EBX to 5. // Jump if less than five. EBX // Turn negative into positive. EBX , i EBX , 0 JE_PosNum // Move i's value into EBX. // Compare EBX to zero (EBX -0). // If result is greater than zero, printf ( "abs(i) < 5\n" ) ; printf ( "abs(i) >= 5\n" ) ;
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EAX , szAbsGTEFive // Get the pointer to the correct
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JE_LessThan5: LEA EAX. JE_DoPrintf: PUSH EAX ADD } } Looping LOOP Loop according to ECX counter You might not run into too many LOOP instructions because the Microsoft compilers don't generate them that much. In some parts of the operating system core, however (parts that look as if Microsoft wrote them in assembly language), you'll occasionally see them. Using the LOOP instruction is easy. Set ECX equal to the number of times to loop, and then execute a block of code. Immediately following the code is the LOOP instruction, which decrements ECX and then jumps to the top of the block if ECX isn't equal to 0. When ECX reaches 0, the LOOP instruction falls through. Most of the loops you'll see are a combination of conditional jumps and absolute jumps. In many ways, these loops look like the if statement code presented a moment ago except that the bottom of the if block is a JMP instruction back to the top. The following example is representative of your average code-generation loop. void LoopingExample ( int q ) { // Here's the C code: // for ( ; q < 10 ; q++ ) // { // // } char szFmt[] = "q = %d\n" ; __asm { JMP against // 10 immediately. LE_IncrementStep: INC q // Increment q. 297 LE_CompareStep // First time through, check printf ( "q = %d\n" , q ) ; ESP , 4 // Push the string. // Restore the stack. EAX , szAbsLTFive // Get the correct pointer into
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CALL DWORD PTR [printf] // Print it.
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LE_CompareStep: CMP JGE done. MOV LEA stack. CALL DWORD PTR [printf] ADD JMP LE_End: } } String Manipulation The Intel CPUs are adept at manipulating strings. In the vernacular of CPUs, being good at string manipulation means that the CPU can manipulate large chunks of memory in a single instruction. All the string instructions I'll show you have several mnemonics, which you'll see if you look them up in the Intel reference manuals, but the Visual Studio .NET Disassembly window always disassembles string instructions into the forms I show. All these instructions can work on byte, word, and double-word size memory. MOVS Move data from string to string The MOVS instruction moves the memory address at ESI to the memory address at EDI. The MOVS instruction operates only on values that ESI and EDI point to. You can think of the MOVS instruction as the implementation of the C memcpy function. The Visual Studio .NET Disassembly window always shows the size of the operation with the size specifier, so you can tell at a glance how much memory is being moved. After the move is completed, the ESI and EDI registers are incremented or decremented depending on the Direction Flag in the EFLAGS register (shown as the UP field in the Visual Studio .NET Registers window). If the UP field is 0, the registers are incremented. If the UP field is 1, the registers are decremented. In all Microsoft compiler-generated code, the UP flag is always set to 1. The increment and decrement amounts depend on the size of the operation: 1 for bytes, 2 for words, and 4 for double words. SCASS can string The SCAS instruction compares the value at the memory address specified by the EDI register with the value in AL, AX, or EAX, depending on the requested size. The various flag values in EFLAGS are set to indicate the comparison values. The flag settings are the 298 ESP , 8 LE_IncrementStep // Print the current iteration. // Clean up the stack. // Increment q, and start again. // The loop is done. ECX , DWORD PTR [q] // Get the value of q into ECX. // Get the value onto the stack. // Get the format string. // Push the format string onto the ECX , szFmt q , 0Ah LE_End // Compare q to 10. // If q is >= 10, this function is
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