From mboxrd@z Thu Jan  1 00:00:00 1970
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
Date: Sat, 26 Mar 2011 10:20:41 +0000
Subject: [PATCH] ARM: kernel/sleep.S: fix Thumb2 compilation issues
In-Reply-To: <alpine.LFD.2.00.1103182256330.26889@xanadu.home>
References: <alpine.LFD.2.00.1103182256330.26889@xanadu.home>
Message-ID: <20110326102041.GA24620@n2100.arm.linux.org.uk>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Fri, Mar 18, 2011 at 11:00:02PM -0400, Nicolas Pitre wrote:
> 
> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
> 
> diff --git a/arch/arm/kernel/sleep.S b/arch/arm/kernel/sleep.S
> index bfad698..6398ead 100644
> --- a/arch/arm/kernel/sleep.S
> +++ b/arch/arm/kernel/sleep.S
> @@ -119,11 +119,19 @@ ENTRY(cpu_resume)
>  #else
>  	ldr	r0, sleep_save_sp	@ stack phys addr
>  #endif
> -	msr	cpsr_c, #PSR_I_BIT | PSR_F_BIT | SVC_MODE @ set SVC, irqs off
> +	setmode	PSR_I_BIT | PSR_F_BIT | SVC_MODE, r1  @ set SVC, irqs off
>  #ifdef MULTI_CPU
> -	ldmia	r0!, {r1, sp, lr, pc}	@ load v:p, stack, return fn, resume fn
> +	@ load v:p, stack, return fn, resume fn
> +  ARM(	ldmia	r0!, {r1, sp, lr, pc}	)
> +THUMB(	ldmia	r0!, {r1, r2, r3, r4}	)
> +THUMB(	mov	sp, r2			)
> +THUMB(	mov	lr, r3			)
> +THUMB(	bx	r4			)
>  #else
> -	ldmia	r0!, {r1, sp, lr}	@ load v:p, stack, return fn
> +	@ load v:p, stack, return fn
> +  ARM(	ldmia	r0!, {r1, sp, lr}	)
> +THUMB(	ldmia	r0!, {r1, r2, lr}	)
> +THUMB(	mov	sp, r2			)
>  	b	cpu_do_resume
>  #endif
>  ENDPROC(cpu_resume)

Do we know whether boot loaders support calling the resume path in Thumb
mode, and is the necessary setup in place for telling boot loaders that
they are to call the resume path in Thumb mode?