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Re: [PATCH 3/3] aarch64: Save and restore SVE registers in ld.so

From: Richard Henderson <richard dot henderson at linaro dot org>
To: Florian Weimer <fweimer at redhat dot com>, rth at twiddle dot net, libc-alpha at sourceware dot org
Cc: marcus dot shawcroft at linaro dot org, szabolcs dot nagy at arm dot com
Date: Thu, 2 Aug 2018 09:05:33 -0400
Subject: Re: [PATCH 3/3] aarch64: Save and restore SVE registers in ld.so
References: <20180801222347.18903-1-rth@twiddle.net> <20180801222347.18903-4-rth@twiddle.net> <4f5e94bb-aef5-f545-5b1c-ea77221c73cc@redhat.com>

On 08/02/2018 03:29 AM, Florian Weimer wrote:
> On 08/02/2018 12:23 AM, rth@twiddle.net wrote:
>> +/*
>> + * For functions conforming to the procedure call standard as
>> + * amended for SVE support (ARM_100986_0000_00_en (SVEpcs 00bet1)),
>> + * we must save the entire contents of Z0-Z7 as well as P0-P3.
>> + */
> 
> What's the worst-case additional stack usage due to this change?

The current architectural maximum vector size is 256 bytes,
so 2176 bytes total.


r~

Follow-Ups:
- Re: [PATCH 3/3] aarch64: Save and restore SVE registers in ld.so
  - From: Szabolcs Nagy

References:
- [PATCH 0/3] aarch64: Update ld.so for vector abi
  - From: rth
- [PATCH 3/3] aarch64: Save and restore SVE registers in ld.so
  - From: rth
- Re: [PATCH 3/3] aarch64: Save and restore SVE registers in ld.so
  - From: Florian Weimer

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