Re: [PATCH v3 4/5] powerpc/vdso: Wire up getrandom() vDSO implementation on PPC32

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To: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Subject: Re: [PATCH v3 4/5] powerpc/vdso: Wire up getrandom() vDSO implementation on PPC32
From: "Jason A. Donenfeld" <Jason@xxxxxxxxx>
Date: Fri, 30 Aug 2024 18:14:45 +0200
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Masami Hiramatsu <mhiramat@xxxxxxxxxx>, Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Nicholas Piggin <npiggin@xxxxxxxxx>, Naveen N Rao <naveen@xxxxxxxxxx>, Nathan Chancellor <nathan@xxxxxxxxxx>, Nick Desaulniers <ndesaulniers@xxxxxxxxxx>, Bill Wendling <morbo@xxxxxxxxxx>, Justin Stitt <justinstitt@xxxxxxxxxx>, Shuah Khan <shuah@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx, llvm@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-trace-kernel@xxxxxxxxxxxxxxx, Adhemerval Zanella <adhemerval.zanella@xxxxxxxxxx>, Xi Ruoyao <xry111@xxxxxxxxxxx>
In-reply-to: <e7e4c6d36cf98229850c333f113bcea909564501.1725031952.git.christophe.leroy@csgroup.eu>
References: <cover.1725031952.git.christophe.leroy@csgroup.eu> <e7e4c6d36cf98229850c333f113bcea909564501.1725031952.git.christophe.leroy@csgroup.eu>

On Fri, Aug 30, 2024 at 05:57:08PM +0200, Christophe Leroy wrote:
> + *	r5: 8-byte counter input/output (saved on stack)
> + *
> + *	r14-r15: counter
> + */
> +SYM_FUNC_START(__arch_chacha20_blocks_nostack)
> +	stwu	r1, -96(r1)
> +	stw	r5, 20(r1)
> +	stmw	r14, 24(r1)
> +	li	r31, 4
> +	LWZX_LE	r14, 0, r5
> +	LWZX_LE	r15, r31, r5

Why swap endian on the counter?

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References:
- [PATCH v3 0/5] Wire up getrandom() vDSO implementation on powerpc
  - From: Christophe Leroy
- [PATCH v3 4/5] powerpc/vdso: Wire up getrandom() vDSO implementation on PPC32
  - From: Christophe Leroy

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