linux-kernel - Re: [PATCH v4 5/5] powerpc/vdso: Wire up getrandom() vDSO implementation on PPC64

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Message-ID: <ZtWyeuCfzZ66fVsg@zx2c4.com>
Date: Mon, 2 Sep 2024 14:41:30 +0200
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Naveen N Rao <naveen@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kselftest@...r.kernel.org,
	llvm@...ts.linux.dev, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, linux-trace-kernel@...r.kernel.org,
	Adhemerval Zanella <adhemerval.zanella@...aro.org>,
	Xi Ruoyao <xry111@...111.site>
Subject: Re: [PATCH v4 5/5] powerpc/vdso: Wire up getrandom() vDSO
 implementation on PPC64

On Mon, Sep 02, 2024 at 02:04:42PM +0200, Christophe Leroy wrote:
>  SYM_FUNC_START(__arch_chacha20_blocks_nostack)
>  #ifdef __powerpc64__
> -	blr
> +	std	r5, -216(r1)
> +
> +	std	r14, -144(r1)
> +	std	r15, -136(r1)
> +	std	r16, -128(r1)
> +	std	r17, -120(r1)
> +	std	r18, -112(r1)
> +	std	r19, -104(r1)
> +	std	r20, -96(r1)
> +	std	r21, -88(r1)
> +	std	r22, -80(r1)
> +	std	r23, -72(r1)
> +	std	r24, -64(r1)
> +	std	r25, -56(r1)
> +	std	r26, -48(r1)
> +	std	r27, -40(r1)
> +	std	r28, -32(r1)
> +	std	r29, -24(r1)
> +	std	r30, -16(r1)
> +	std	r31, -8(r1)
>  #else
>  	stwu	r1, -96(r1)
>  	stw	r5, 20(r1)
> +#ifdef __BIG_ENDIAN__
>  	stmw	r14, 24(r1)
> +#else
> +	stw	r14, 24(r1)
> +	stw	r15, 28(r1)
> +	stw	r16, 32(r1)
> +	stw	r17, 36(r1)
> +	stw	r18, 40(r1)
> +	stw	r19, 44(r1)
> +	stw	r20, 48(r1)
> +	stw	r21, 52(r1)
> +	stw	r22, 56(r1)
> +	stw	r23, 60(r1)
> +	stw	r24, 64(r1)
> +	stw	r25, 68(r1)
> +	stw	r26, 72(r1)
> +	stw	r27, 76(r1)
> +	stw	r28, 80(r1)
> +	stw	r29, 84(r1)
> +	stw	r30, 88(r1)
> +	stw	r31, 92(r1)
> +#endif
> +#endif

This confuses me. Why are you adding code to the !__powerpc64__ branch
in this commit? (Also, why does stmw not work on LE?)