linux-kernel - Re: [uClinux-dev] [PATCH] m68knommu : Fix strace support for 68328/68360

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Date:	Thu, 19 Aug 2010 13:04:20 +1000
From:	Greg Ungerer <gerg@...pgear.com>
To:	uClinux development list <uclinux-dev@...inux.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [uClinux-dev] [PATCH] m68knommu : Fix strace support for 68328/68360


Hi Philippe,

Philippe De Muyter wrote:
> m68knommu : Fix strace support for 68328/68360
> 
> strace enabled is marked using the `flags' field of the `thread_info' struct.
> 68360 version of entry.S did test a wrong bit in a wrong structure
> (task_struct).
> 68328 version of entry.S did test the right bit in the right structure,
> but wrongly, because the `flags' field is 32 bit wide, while the used
> assembler insn (btst) only accesses a 8 bit byte in memory.
> 
> Fix both using code already used in the coldfire version of entry.S
> 
> Signed-off-by: Philippe De Muyter <phdm@...qel.be>

Thanks. I add that to the m68knommu git tree.

Regards
Greg



> ---
> diff --git a/arch/m68knommu/platform/68328/entry.S b/arch/m68knommu/platform/68328/entry.S
> index 9d80d2c..74229f7 100644
> --- a/arch/m68knommu/platform/68328/entry.S
> +++ b/arch/m68knommu/platform/68328/entry.S
> @@ -80,7 +80,7 @@ ENTRY(system_call)
>  	movel	%sp,%d1			/* get thread_info pointer */
>  	andl	#-THREAD_SIZE,%d1
>  	movel	%d1,%a2
> -	btst    #TIF_SYSCALL_TRACE,%a2@(TI_FLAGS)
> +	btst	#(TIF_SYSCALL_TRACE%8),%a2@(TI_FLAGS+(31-TIF_SYSCALL_TRACE)/8)
>  	jne	do_trace
>  	cmpl	#NR_syscalls,%d0
>  	jcc	badsys
> diff --git a/arch/m68knommu/platform/68360/entry.S b/arch/m68knommu/platform/68360/entry.S
> index 6d3460a..d5ad408 100644
> --- a/arch/m68knommu/platform/68360/entry.S
> +++ b/arch/m68knommu/platform/68360/entry.S
> @@ -71,7 +71,12 @@ ENTRY(system_call)
>  	jbsr	set_esp0
>  	addql	#4,%sp
>  
> -	btst	#PF_TRACESYS_BIT,%a2@(TASK_FLAGS+PF_TRACESYS_OFF)
> +	movel	%sp@(PT_OFF_ORIG_D0),%d0
> +
> +	movel	%sp,%d1			/* get thread_info pointer */
> +	andl	#-THREAD_SIZE,%d1
> +	movel	%d1,%a2
> +	btst	#(TIF_SYSCALL_TRACE%8),%a2@(TI_FLAGS+(31-TIF_SYSCALL_TRACE)/8)
>  	jne	do_trace
>  	cmpl	#NR_syscalls,%d0
>  	jcc	badsys


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Greg Ungerer  --  Principal Engineer        EMAIL:     gerg@...pgear.com
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