Subject: [PATCH 9/9] ARM: asm/opcodes.h: use ARM_HAVE_INST to use .inst to build instructions

From: [email-masked] (Taras Kondratiuk)
Date: Fri, 29 Nov 2013 19:57:32 +0200

On 11/08/2013 08:37 PM, Ben Dooks wrote:
> Currently the <asm/opcodes.h> header uses .work and .short to build
> instructions. This means the output data does not get marked as an
> instruction which can cause issues such as BE8 code failures.
> 
> Signed-off-by: Ben Dooks <[email-masked]>
> ---
>  arch/arm/include/asm/opcodes.h | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/arch/arm/include/asm/opcodes.h b/arch/arm/include/asm/opcodes.h
> index e796c59..4c7cac1 100644
> --- a/arch/arm/include/asm/opcodes.h
> +++ b/arch/arm/include/asm/opcodes.h
> @@ -103,9 +103,15 @@ extern asmlinkage unsigned int arm_check_condition(u32 opcode, u32 psr);
>  #define __opcode_to_mem_arm(x) ___opcode_swab32(x)
>  #define __opcode_to_mem_thumb16(x) ___opcode_swab16(x)
>  #define __opcode_to_mem_thumb32(x) ___opcode_swahb32(x)
> +#ifdef ARM_HAVE_INST
>  #define ___asm_opcode_to_mem_arm(x) ___asm_opcode_swab32(x)
>  #define ___asm_opcode_to_mem_thumb16(x) ___asm_opcode_swab16(x)
>  #define ___asm_opcode_to_mem_thumb32(x) ___asm_opcode_swahb32(x)
> +#else
> +#define ___asm_opcode_to_mem_arm(x) ___asm_opcode_identity32(x)
> +#define ___asm_opcode_to_mem_thumb16(x) ___asm_opcode_identity16(x)
> +#define ___asm_opcode_to_mem_thumb32(x) ___asm_opcode_identity32(x)
> +#endif /* !ARM_HAVE_INST */
>  
>  #else /* ! CONFIG_CPU_ENDIAN_BE8 */
>  
> @@ -218,14 +224,27 @@ extern asmlinkage unsigned int arm_check_condition(u32 opcode, u32 psr);
>  
>  /* Helpers for the helpers.  Don't use these directly. */
>  #ifdef __ASSEMBLY__
> +#ifdef ARM_HAVE_INST
> +#define ___inst_arm(x) .inst x
> +#define ___inst_thumb16(x) .inst.w x
> +#define ___inst_thumb32(first, second) .inst.w first, second
> +#else
>  #define ___inst_arm(x) .long x
>  #define ___inst_thumb16(x) .short x
>  #define ___inst_thumb32(first, second) .short first, second
> +#endif /* !ARM_HAVE_INST */
> +#else
> +#ifdef ARM_HAVE_INST
> +#define ___inst_arm(x) ".inst " __stringify(x) "\n\t"
> +#define ___inst_thumb16(x) ".inst.w " __stringify(x) "\n\t"

It should be .inst.n instead of .inst.w

> +#define ___inst_thumb32(first, second) \
> +	".inst.w " __stringify(first) ", " __stringify(second) "\n\t"

I have not checked, but I think .inst.w will not combine two 16-bit
arguments into one 32-bit instruction, but instead it will generate two
wrong 32-bit instructions here.

>  #else
>  #define ___inst_arm(x) ".long " __stringify(x) "\n\t"
>  #define ___inst_thumb16(x) ".short " __stringify(x) "\n\t"
>  #define ___inst_thumb32(first, second) \
>  	".short " __stringify(first) ", " __stringify(second) "\n\t"
> +#endif /* !ARM_HAVE_INST */
>  #endif
>  
>  #endif /* __ASM_ARM_OPCODES_H */
> 

-- 
Taras Kondratiuk