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Message-ID: <20230205235426.GO4163@brightrain.aerifal.cx>
Date: Sun, 5 Feb 2023 18:54:26 -0500
From: Rich Felker <dalias@...c.org>
To: enh <enh@...gle.com>
Cc: Khem Raj <raj.khem@...il.com>, musl@...ts.openwall.com
Subject: Re: SA_RESTORER for rv64?
On Fri, Feb 03, 2023 at 10:44:56AM -0800, enh wrote:
> oops, never actually sent the patch. attached...
>
> On Thu, Nov 10, 2022 at 9:31 AM Khem Raj <raj.khem@...il.com> wrote:
> >
> > On Thu, Nov 10, 2022 at 9:19 AM Rich Felker <dalias@...c.org> wrote:
> > >
> > > On Thu, Nov 10, 2022 at 07:44:23AM -0800, enh wrote:
> > > > arch/riscv64/bits/signal.h has contained a definition for SA_RESTORER since
> > > > the initial commit, but i think that's just copy & paste from whichever
> > > > architecture the rv64 headers were based on? the linux kernel itself
> > > > doesn't have SA_RESTORER for rv64, unless i'm missing something?
> > >
> > > I suspect this is just a mistake. Have you seen any ill effects from
> > > it? If riscv folks can confirm it's wrong, I'll remove it.
> >
> > Yeah I think it should be removed. Perhaps mips is in same boat.
> >
> > >
> > > Rich
> From 6413de6d9f785c98e5bc0cf40be947f1169d2fd7 Mon Sep 17 00:00:00 2001
> From: Elliott Hughes <enh@...gle.com>
> Date: Fri, 3 Feb 2023 10:42:55 -0800
> Subject: [PATCH] risc-v does not have SA_RESTORER.
>
> The kernel's include/uapi/asm-generic/signal-defs.h explicitly calls
> this out as obsolete. New architectures like risc-v do not define it.
> ---
> arch/riscv64/bits/signal.h | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/arch/riscv64/bits/signal.h b/arch/riscv64/bits/signal.h
> index 287367db..fd6157a3 100644
> --- a/arch/riscv64/bits/signal.h
> +++ b/arch/riscv64/bits/signal.h
> @@ -76,7 +76,6 @@ typedef struct __ucontext
> #define SA_RESTART 0x10000000
> #define SA_NODEFER 0x40000000
> #define SA_RESETHAND 0x80000000
> -#define SA_RESTORER 0x04000000
>
> #endif
>
> --
> 2.39.1.519.gcb327c4b5f-goog
>
I don't think this patch works as-is, since musl unconditionally uses
SA_RESTORER. We probably need to make that conditional on its
presence, and it looks like there's also a wrong-struct-layout issue
on archs where it's absent...
Rich
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