assemblyfundamentals

assemblyfundamentals内容摘要：

n PROC mov eax,10000h。 EAX = 10000h add eax,40000h。 EAX = 50000h sub eax,20200h。 EAX = 30000h call DumpRegs INVOKE ExitProcess,0 main ENDP END main Program template TITLE Program Template ()。 Program Description:。 Author:。 Creation Date:。 Revisions:。 Date: Modified by: INCLUDE .data。 (insert variables here) .code main PROC。 (insert executable instructions here) exit main ENDP。 (insert additional procedures here) END main Assemblelink execute cycle • The following diagram describes the steps from creating a source program through executing the piled program. • If the source code is modified, Steps 2 through 4 must be repeated. S ou r c eF i l eO bj ec tF i l eLi s ti ngF i l eLi nkLi brar yE x ec uta bl eF i l eMapF i l eO utp utS t e p 1 : t e x t e d it o rS t e p 2 :a s s e mblerS t e p 3 :li n k e rS t e p 4 :OS loa d e r • Called a batch file • Run it to assemble and link programs • Contains a mand that executes (the Microsoft Assembler) • Contains a mand that executes (the 32bit Microsoft Linker) • CommandLine syntax: make32 progName (progName includes the .asm extension) (use to assemble and link Realmode programs) Listing file • Use it to see how your program is piled • Contains – source code – addresses – object code (machine language) – segment names – symbols (variables, procedures, and constants) • Example: Defining data • Intrinsic data types • Data Definition Statement • Defining BYTE and SBYTE Data • Defining WORD and SWORD Data • Defining DWORD and SDWORD Data • Defining QWORD Data • Defining TBYTE Data • Defining Real Number Data • Little Endian Order • Adding Variables to the AddSub Program • Declaring Uninitialized Data Intrinsic data types (1 of 2) • BYTE, SBYTE – 8bit unsigned integer。 8bit signed integer • WORD, SWORD – 16bit unsigned amp。 signed integer • DWORD, SDWORD – 32bit unsigned amp。 signed integer • QWORD – 64bit integer • TBYTE – 80bit integer Intrinsic data types (2 of 2) • REAL4 – 4byte IEEE short real • REAL8 – 8byte IEEE long real • REAL10 – 10byte IEEE extended real Data definition statement • A data definition statement sets aside storage in memory for a variable. • May optionally assign a name (label) to the data • Syntax: [name] directive initializer [,initializer] . . . At least one initializer is required, can be ? • All initializers bee binary data in memory Defining BYTE and SBYTE Data value1 BYTE 39。 A39。 character constant value2 BYTE 0。 smallest unsigned byte value3 BYTE 255。 largest unsigned byte value4 SBYTE 128。 smallest signed byte value5 SBYTE +127。 largest signed byte value6 BYTE ?。 uninitialized byte E。