Assembly language (Wang Shuang) The first procedure of the 4th chapter

This chapter is a practical part, wrote a assembler program, and debug to track each instruction process, see Register and memory changes, is a small summary of the previous

4.1 Process of source program to execution

A assembler to write, to compile into the target file, the file suffix is obj, and then link to form an EXE suffix, and then go to execute

4.2 Source Program

Directly put

Pseudo-directives are executed by the compiler, and assembly instructions are executed by the CPU

Assume is a pseudo-directive, associated segment registers and programs that are associated with the segment represented by the segment and end

Segment and ends represent the beginning and end of a segment

End means the entire program ends

In addition, the program will have something called a program to return.

If the P2 to run, must have a P1 in the run, P1 to throw P2 into memory, the CPU control to P2,P2 run out, the CPU control back to P1. This is called the program to return

Last 2 instructions

MOV ax,4c00h

int 21h

is the implementation of the program returned. I don't know exactly why, I'm dead, remember.

4.3 Write source program

1.asm

4.4 Compiling

1.asm->1.obj

4.5 Links

1.obj->1.exe

4.6 Simplifying compilation and linking to the same step

The previous compilations and links are written separately using Microsoft's masm5.0 and linker3.6

But mine's a 64-bit machine, running.

I used DOSBox.

Drop link

http://download.csdn.net/download/wy4649/5536047

There are tutorials inside

Point of operation, you can directly complete the process of compiling and linking, generating 1.exe files

4.7 Running Traces

Use Debug to step through 1.exe execution

Let's put a final program running.

In addition, the last statement executes with P to execute, not T. Specifically not very clear, p probably represents the end of a program, to prevent debug and then tracking the following and program-independent instructions

This chapter must oneself knock Knock knock, knock N long to understand ~~~~~~

And it took a lot of time to toss DOSBox.

That's the first thing. Good night, ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~.

Eof

Assembly language (Wang Shuang) The first procedure of the 4th chapter