Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

kretprobe alias for retval #225

Closed
brendangregg opened this issue Sep 17, 2015 · 5 comments
Closed

kretprobe alias for retval #225

brendangregg opened this issue Sep 17, 2015 · 5 comments
Labels
enhancement

Comments

@brendangregg
Copy link
Member

On kprobe, I can declare and use the function arguments. On kretprobe, is there an alias for the return value? I'm currently using ctx->ax, which is platform dependent.
@drzaeus77
Copy link
Collaborator

That's it for now. It's a fair ask.

@brendangregg
Copy link
Member Author

x86_64 ABI references (these just confirm that %ax is correct to use): https://en.wikipedia.org/wiki/X86_calling_conventions#System_V_AMD64_ABI and http://x86-64.org/documentation/abi.pdf

@brendangregg
Copy link
Member Author

This should also work for uretprobe

@brendangregg brendangregg mentioned this issue Feb 5, 2016
Closed
This was referenced May 3, 2016
Closed
Merged
@brendangregg
Copy link
Member Author

Extending on #529, perhaps we just need to add a PT_REGS_RVAL alias?

@brendangregg
Copy link
Member Author

We now have PT_REGS_RC(ctx). Closing ticket.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees
No one assigned
Labels
enhancement
Projects
None yet
Milestone
No milestone
Development

No branches or pull requests
2 participants
@brendangregg @drzaeus77