Re: [PATCH 1/2] syscall.2: arm: Use real register names for arm/OABI

["Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>]

On 5/5/20 5:24 PM, Dave Martin wrote:
> The arm OABI syscall interface is currently documented in terms of
> register name aliases defined by the ARM Procedure Call Standard
> (APCS).  However, these don't make sense in the context of a binary
> interface that doesn't comply (or need to comply) with APCS.
> 
> Use the real architectural register names instead.
> 
> The names a1-a4, v1... are just aliases for r0-r3, r4... anyway, so
> the interface is just the same regardless of which set of names is
> used.
> 
> Signed-off-by: Dave Martin <Dave.Martin@arm.com>

Thanks, Dave. Patch applied, with Russell's Acked-by added.

Cheers,

Michael

> ---
>  man2/syscall.2 | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/man2/syscall.2 b/man2/syscall.2
> index f2b277b..53ab40e 100644
> --- a/man2/syscall.2
> +++ b/man2/syscall.2
> @@ -201,7 +201,7 @@ Arch/ABI	Instruction	System	Ret	Ret	Error	Notes
>  _
>  alpha	callsys	v0	v0	a4	a3	1, 6
>  arc	trap0	r8	r0	-	-
> -arm/OABI	swi NR	-	a1	-	-	2
> +arm/OABI	swi NR	-	r0	-	-	2
>  arm/EABI	swi 0x0	r7	r0	r1	-
>  arm64	svc #0	x8	x0	x1	-
>  blackfin	excpt 0x0	P0	R0	-	-
> @@ -332,7 +332,7 @@ Arch/ABI	arg1	arg2	arg3	arg4	arg5	arg6	arg7	Notes
>  _
>  alpha	a0	a1	a2	a3	a4	a5	-
>  arc	r0	r1	r2	r3	r4	r5	-
> -arm/OABI	a1	a2	a3	a4	v1	v2	v3
> +arm/OABI	r0	r1	r2	r3	r4	r5	r6
>  arm/EABI	r0	r1	r2	r3	r4	r5	r6
>  arm64	x0	x1	x2	x3	x4	x5	-
>  blackfin	R0	R1	R2	R3	R4	R5	-
> 


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/