lecture3assemblylanguagefundamentals

lecture3assemblylanguagefundamentals内容摘要：

6 4 K Co m pa ct C o d e = 6 4 K L a rg e Array s = 6 4 K Hug e Array s 6 4 K allo wed Fla t 32 b it ad d ress es , Pro tected m o d e o n ly Outline  Basic Elements of Assembly  Sample Program  Assembling, Linking, and Running  Defining Data  Symbolic Constants Assembling, Linking and Running Source file (.asm) Text editor Assembler Object file (.obj) Listing file (.lst) Linker Link library (.lib) Executable program (.exe) Map file (.map) Dos Loader Output ML  Assembling Assembling, Linking and Running Two staged process: – Assemble: Converts assembly language into machine language. Uses source file, outputs object file and optionally the list file – Link: Connects (links) the different .obj and library files together to create the executable file. Uses the object file(s) and optionally a library. Outputs executable file and optionally map file Both done with ML mand  MASM  ML bines assembling and linking  Example ml Zi Fl Fm  Zi Include debug information for Codeview  Fl Produce listing file  Fm Produce map file  Options are CASE SENSITIVE!  You can use or / for options Assembling, Linking and Running ALL THESE COMMANDS HAVE BEEN INCLUDED IN THE – make32 filename Defining Data  Directives (see pp. 8081) DB, BYTE 8bit unsigned integer SBYTE 8bit singed integer DW, WORD 16bit unsigned integer SWORD 16bit signed integer DWORD 32bit integer SDWORD 32bit signed integer REAL4 32bit IEEE short real REAL8 64bit IEEE long real Defining Data Symbolic name for a location in memory During assembly, the value of a variable name is its offset from the beginning of the segment! Examples: Name byte Joe Brown Cost word 14 Defining Data  General Format [name]。