Re: [Xen-devel] [PATCH 09/13] xen/arm64: Add generic assembly macros

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Tue, 22 May 2018, Julien Grall wrote:
> Add assembly macros to simplify assembly code:
>     - adr_cpu_info: Get the address to the current cpu_info structure
>     - ldr_this_cpu: Load a per-cpu value
> 
> This is part of XSA-263.
> 
> Signed-off-by: Julien Grall <julien.grall@xxxxxxx>

Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>


> ---
>  xen/include/asm-arm/arm64/macros.h | 25 +++++++++++++++++++++++++
>  xen/include/asm-arm/macros.h       |  2 +-
>  2 files changed, 26 insertions(+), 1 deletion(-)
>  create mode 100644 xen/include/asm-arm/arm64/macros.h
> 
> diff --git a/xen/include/asm-arm/arm64/macros.h 
> b/xen/include/asm-arm/arm64/macros.h
> new file mode 100644
> index 0000000000..9c5e676b37
> --- /dev/null
> +++ b/xen/include/asm-arm/arm64/macros.h
> @@ -0,0 +1,25 @@
> +#ifndef __ASM_ARM_ARM64_MACROS_H
> +#define __ASM_ARM_ARM64_MACROS_H
> +
> +    /*
> +     * @dst: Result of get_cpu_info()
> +     */
> +    .macro  adr_cpu_info, dst
> +    add     \dst, sp, #STACK_SIZE
> +    and     \dst, \dst, #~(STACK_SIZE - 1)
> +    sub     \dst, \dst, #CPUINFO_sizeof
> +    .endm
> +
> +    /*
> +     * @dst: Result of READ_ONCE(per_cpu(sym, smp_processor_id()))
> +     * @sym: The name of the per-cpu variable
> +     * @tmp: scratch register
> +     */
> +    .macro  ldr_this_cpu, dst, sym, tmp
> +    ldr     \dst, =per_cpu__\sym
> +    mrs     \tmp, tpidr_el2
> +    ldr     \dst, [\dst, \tmp]
> +    .endm
> +
> +#endif /* __ASM_ARM_ARM64_MACROS_H */
> +
> diff --git a/xen/include/asm-arm/macros.h b/xen/include/asm-arm/macros.h
> index 5d837cb38b..1d4bb41d15 100644
> --- a/xen/include/asm-arm/macros.h
> +++ b/xen/include/asm-arm/macros.h
> @@ -8,7 +8,7 @@
>  #if defined (CONFIG_ARM_32)
>  # include <asm/arm32/macros.h>
>  #elif defined(CONFIG_ARM_64)
> -/* No specific ARM64 macros for now */
> +# include <asm/arm64/macros.h>
>  #else
>  # error "unknown ARM variant"
>  #endif
> -- 
> 2.11.0
> 

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