Main: the program label for the entry point data Data section, initialized variablesįmt: db 'a=%d, eax=%d', 10, 0 The printf format, ' ','0' * printf1.c print an int and an expression */Įxtern printf the C function, to be called Assemble: nasm -f elf -l printf.lst printf1.asm printf1.asm print an integer from storage and from a register The equivalent 'C' code is shown as comments in the assembly language. This program demonstrates basic use of 'C' library function printf. Running the program produces output printf1.out The result of the assembly is printf1.lst Mov eax,4 write sysout command to int 80 hex Mov edx,len arg3, length of string to print Global main make label available to linker Msg: db 'Hello World',10 the string to print, 10=cr assemble: nasm -f elf -l hello.lst hello.asm hello.asm a first program for nasm for Linux, Intel, gcc This program demonstrates basic text output to a screen.Ĭalls are made to the operating system directly. Running the program produces output hello.out fltarith.asm simple floating point arithmetic hello.asm basic stand alone program.386, 486, pentium Specifically: for use with gcc with its libraries and gdb Specifically: simple nasm syntax using 'C' literals Specifically: showing an equivalent 'C' program Generally, for Linux and possibly other Unix on Intel Generally, not using 8-bit or 16-bit for anything The 64-bit samples are here Contents Sample nasm programs Sample nasm programs Specifically: for Intel I-32, e.g.

Mov c 00 hex code