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If..we..were..to..modify..our..message..string..we..would..have..to..update..the..length..in..bytes..that..we..pass..to..syswrite..as..well,..otherwise..it..will..not..print..correctlyThese...tutorials...however...were...written...to...provide...a...foundation...in...NASM...by...first...writing...code...and...then...understanding...the...theoryWhat’s...going...on?...The...last...two...stack...items...for...a...NASM...compiled...program...are...always...the...name...of...the...program...and...the...number...of...passed...argumentsThe..quotient..part..of..the..value..is..left..in..EAX..and..the..remainder..part..is..put..into..EDX..(Originally..called..the..data..register)When..sysread..detects..a..linefeed,..control..returns..to..the..program..and..the..users..input..is..located..at..the..memory..address..you..passed..in..ECXexecute.asm..SECTION...data..command..db..’/bin/ls’,..0h..;..command..to..execute..arg1..db..’-l’,..0h..execute.asm..SECTION...data..command..db..’/bin/sleep’,..0h..;..command..to..execute..arg1..db..’5’,..0h..Lesson..7..Linefeeds..How..you..can..use..the..stack..to..print..linefeeds..after..strings..and..an..introduction..to..the..Extended..Stack..Pointer..ESPAs...we...are...calling...a...simple...command...we...won’t...pass...any...special...environment...variables...to...the...new...process...and...instead...will...pass...0h...(null)We..can..test..the..return..value..(in..eax)..to..test..whether..we..are..currently..in..the..parent..or..child..process

Numbers...that...are...both...divisible...by...3...and...5...are...replaced...by...the...word..."fizzbuzz"A....call....to....syswrite....requires....we....pass....a....pointer....to....an....address....in....memory....of....the....string....we....want....to....print....so....we....can’t....just....pass....a....linefeed....character....(0Ah)....to....our....print....functionThis...address...is...then...popped...off...the...stack...by...RET...and...the...program...jumps...back...to...that...place...in...your...codeIf....we....continue....to....hard....code....them....in....our....variables....by....adding....0Ah....after....our....declared....message....text,....it....will....become....a....problemThe..answer..is..left..in..EAXhelloworld-len.asm...;...Hello...World...Program...(Subroutines)...;...Compile...with:...nasm...-f...elf...helloworld-len.asm...;...Link...with...(64...bit...systems...require...elfi386...option):...ld...-m...elfi386...helloworld-len.o...-o...helloworld-len...;...Run...with:..../helloworld-len...SECTION....data...msg...db...’Hello,...brave...new...world!’,...0Ah...SECTION....text...global...start...start:...mov...eax,...msg...;...move...the...address...of...our...message...string...into...EAX...call...strlen...;...call...our...function...to...calculate...the...length...of...the...string...mov...edx,...eax...;...our...function...leaves...the...result...in...EAX...mov...ecx,...msg...;...this...is...all...the...same...as...before...mov...ebx,...1...mov...eax,...4...int...80h...mov...ebx,...0...mov...eax,...1...int...80h...strlen:...;...this...is...our...first...function...declaration...push...ebx...;...push...the...value...in...EBX...onto...the...stack...to...preserve...it...while...we...use...EBX...in...this...function...mov...ebx,...eax...;...move...the...address...in...EAX...into...EBX...(Both...point...to...the...same...segment...in...memory)...nextchar:...;...this...is...the...same...as...lesson3...cmp...byte...[eax],...0...jz...finished...inc...eax...jmp...nextchar...finished:...sub...eax,...ebx...pop...ebx...;...pop...the...value...on...the...stack...back...into...EBX...ret...;...return...to...where...the...function...was...called...$...nasm...-f...elf...helloworld-len.asm...$...ld...-m...elfi386...helloworld-len.o...-o...helloworld-len...$..../helloworld-len...Hello,...brave...new...world!...View...lesson......Lesson...17...Namespace...Introduction...to...how...NASM...handles...namespace...when...it...comes...to...global...and...local...labelsThat..way..we..can..just..call..this..subroutine..when..we..need..the..linefeed..and..call..our..current..sprint..subroutine..when..we..don’tThis...function...will...convert...the...ascii...value...into...an...integer...and...place...the...result...in...EAX b7dc4c5754