# Re: \[PATCH 1/2\] powerpc/64s/syscall: Use pt\_regs.trap to distinguish syscall ABI difference between sc and scv syscalls

- From: Michael Ellerman \<hidden\>
- Date: 2021-05-21 12:45:19 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2021/05/9522859
- Thread: https://ratatoskr.run/linuxppc-dev/2021/05/9522831/t.md

```text
On Thu, 20 May 2021 21:19:30 +1000, Nicholas Piggin wrote:
> The sc and scv 0 system calls have different ABI conventions, and
> ptracers need to know which system call type is being used if it wants
> to look at the syscall registers.
> 
> Document that pt_regs.trap can be used for this, and fix one in-tree user
> to work with scv 0 syscalls.

Applied to powerpc/fixes.

[1/2] powerpc/64s/syscall: Use pt_regs.trap to distinguish syscall ABI difference between sc and scv syscalls
      https://git.kernel.org/powerpc/c/5665bc35c1ed917ac8fd06cb651317bb47a65b10
[2/2] powerpc/64s/syscall: Fix ptrace syscall info with scv syscalls
      https://git.kernel.org/powerpc/c/d72500f992849d31ebae8f821a023660ddd0dcc2

cheers
```