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

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Message-ID: <84682299-8cbe-4b66-9c26-17786e73af55@csgroup.eu>
Date: Fri, 30 Aug 2024 18:42:55 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: "Jason A. Donenfeld" <Jason@...c4.com>
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 v3 4/5] powerpc/vdso: Wire up getrandom() vDSO
 implementation on PPC32

Le 30/08/2024 à 18:14, Jason A. Donenfeld a écrit :
> 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?

Unlike the keys, the counter is passed to the function as an u8*, not as 
a u64*, so I thought it was raw data in little endian order, same as 
when using Sodium. Is it wrong ?

Christophe