linux-kernel - Re: [PATCH 2/3] powerpc/ppc-opcode: Define and use PPC_RAW_TRAP() and PPC_RAW

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Date:   Wed, 03 Aug 2022 13:36:34 +0530
From:   "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 2/3] powerpc/ppc-opcode: Define and use PPC_RAW_TRAP() and
 PPC_RAW_TW()

Christophe Leroy wrote:
> Add and use PPC_RAW_TRAP() instead of opencoding.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> ---
>  arch/powerpc/include/asm/ppc-opcode.h | 2 ++
>  arch/powerpc/include/asm/probes.h     | 3 ++-
>  arch/powerpc/xmon/xmon.c              | 2 +-
>  3 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h
> index 89beabf5325c..5527a955fb4a 100644
> --- a/arch/powerpc/include/asm/ppc-opcode.h
> +++ b/arch/powerpc/include/asm/ppc-opcode.h
> @@ -581,6 +581,8 @@
>  
>  #define PPC_RAW_BRANCH(offset)		(0x48000000 | PPC_LI(offset))
>  #define PPC_RAW_BL(offset)		(0x48000001 | PPC_LI(offset))
> +#define PPC_RAW_TW(t0, a, b)		(0x7f000008 | ___PPC_RS(t0) | ___PPC_RA(a) | ___PPC_RB(b))

Shouldn't that be 0x7c000008 ?

- Naveen


> +#define PPC_RAW_TRAP()			PPC_RAW_TW(31, 0, 0)
>  
>  /* Deal with instructions that older assemblers aren't aware of */
>  #define	PPC_BCCTR_FLUSH		stringify_in_c(.long PPC_INST_BCCTR_FLUSH)
> diff --git a/arch/powerpc/include/asm/probes.h b/arch/powerpc/include/asm/probes.h
> index 00634e3145e7..e77a2ed7d938 100644
> --- a/arch/powerpc/include/asm/probes.h
> +++ b/arch/powerpc/include/asm/probes.h
> @@ -9,8 +9,9 @@
>   */
>  #include <linux/types.h>
>  #include <asm/disassemble.h>
> +#include <asm/ppc-opcode.h>
>  
> -#define BREAKPOINT_INSTRUCTION	0x7fe00008	/* trap */
> +#define BREAKPOINT_INSTRUCTION	PPC_RAW_TRAP()	/* trap */
>  
>  /* Trap definitions per ISA */
>  #define IS_TW(instr)		(((instr) & 0xfc0007fe) == 0x7c000008)
> diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
> index f80c714f1d49..26ef3388c24c 100644
> --- a/arch/powerpc/xmon/xmon.c
> +++ b/arch/powerpc/xmon/xmon.c
> @@ -116,7 +116,7 @@ struct bpt {
>  static struct bpt bpts[NBPTS];
>  static struct bpt dabr[HBP_NUM_MAX];
>  static struct bpt *iabr;
> -static unsigned bpinstr = 0x7fe00008;	/* trap */
> +static unsigned int bpinstr = PPC_RAW_TRAP();
>  
>  #define BP_NUM(bp)	((bp) - bpts + 1)
>  
> -- 
> 2.36.1
> 
> 
>