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Date: Wed, 09 Nov 2016 05:49:00 -0000
From: Sam Ravnborg <sam@ravnborg.org>
To: David Miller <davem@davemloft.net>
Cc: carlos@redhat.com, triegel@redhat.com, adhemerval.zanella@linaro.org,
	andreas@gaisler.com, libc-alpha@sourceware.org,
	software@gaisler.com
Subject: Re: Remove sparcv8 support
Message-ID: <20161109054943.GA14914@ravnborg.org>
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Hi Dave.

> diff --git a/arch/sparc/kernel/casemul.S b/arch/sparc/kernel/casemul.S
> new file mode 100644
> index 0000000..237221f
> --- /dev/null
> +++ b/arch/sparc/kernel/casemul.S
> @@ -0,0 +1,66 @@
> +#include <asm/asi.h>
> +#include <asm/thread_info.h>
> +#include <asm/trap_block.h>
> +#include <asm/ptrace.h>
> +#include <asm/head.h>
> +
> +	.text
> +	.align		128
> +	.globl		emulate_cas
> +	.type		emulate_cas,#function
> +emulate_cas:
ENTRY(emulate_cas)

> +	casa		[%o0] ASI_AIUP, %o1, %o2
> +	done
> +	nop; nop; nop; nop; nop; nop;
> +	nop; nop; nop; nop; nop; nop; nop; nop
> +	nop; nop; nop; nop; nop; nop; nop; nop
> +	nop; nop; nop; nop; nop;
> +	ba,a,pt		%xcc, 3f
> +	ba,a,pt		%xcc, 2f
> +	ba,a,pt		%xcc, 1f
> +	.size		emulate_cas,.-emulate_cas
ENDPROC()

Did not (yet) look at the details of emulate_cas.

	Sam