ARM asm, how to return a value -- Please help

Hi, in a given c program where you have

myvar = sumR(char * arg1, int arg2)

sumR is a function in an assembly .s file. I have done all the calculations, but I have no idea how to return the value to the calling c program.

Any ideas?

Thanks so much.

Contributors

Replies

17 Minutes

Discussion Span

1 Year Ago

Last Updated

Views

Light Poster

35 posts since Nov 2010

Reputation Points: 10

Solved Threads: 3

Skill Endorsements: 0

Usually the value is returned in R0. So in your sumR, after you do your stuff, place what you want myvar to equal in R0

xor eax, eax

Team Colleague

90 posts since Jan 2011

Reputation Points: 38

Solved Threads: 13

Skill Endorsements: 0

Thanks. If you don't mind one more, how do you print the contents of a register which contains an int.

Light Poster

35 posts since Nov 2010

Reputation Points: 10

Solved Threads: 3

Skill Endorsements: 0

Eh, Not sure, I am an x86 guy - sorry. Check the ARM website for debug stuff you can use.

xor eax, eax

Team Colleague

90 posts since Jan 2011

Reputation Points: 38

Solved Threads: 13

Skill Endorsements: 0

This article has been dead for over three months: Start a new discussion instead

You