linux-kernel - Re: [PATCH] perf: Add DWARF register lookup for SH

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Message-ID: <4C3A75E3.6070803@hitachi.com>
Date:	Mon, 12 Jul 2010 10:54:43 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ian Munsie <imunsie@...ibm.com>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [PATCH] perf: Add DWARF register lookup for SH

Matt Fleming wrote:
> Implement get_arch_regstr() for SH so that, given a DWARF register
> number, the corresponding symbolic name of that register can be looked
> up.

OK, the patch itself looks good, but I don't know whether SH kernel
supports KPROBE_EVENT which is required for perf-probe. Or, SH kernel
repository already has it?

Thank you,

> 
> Signed-off-by: Matt Fleming <matt@...sole-pimps.org>
> ---
>  tools/perf/arch/sh/Makefile          |    4 ++
>  tools/perf/arch/sh/util/dwarf-regs.c |   55 ++++++++++++++++++++++++++++++++++
>  2 files changed, 59 insertions(+), 0 deletions(-)
>  create mode 100644 tools/perf/arch/sh/Makefile
>  create mode 100644 tools/perf/arch/sh/util/dwarf-regs.c
> 
> diff --git a/tools/perf/arch/sh/Makefile b/tools/perf/arch/sh/Makefile
> new file mode 100644
> index 0000000..15130b5
> --- /dev/null
> +++ b/tools/perf/arch/sh/Makefile
> @@ -0,0 +1,4 @@
> +ifndef NO_DWARF
> +PERF_HAVE_DWARF_REGS := 1
> +LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o
> +endif
> diff --git a/tools/perf/arch/sh/util/dwarf-regs.c b/tools/perf/arch/sh/util/dwarf-regs.c
> new file mode 100644
> index 0000000..a11edb0
> --- /dev/null
> +++ b/tools/perf/arch/sh/util/dwarf-regs.c
> @@ -0,0 +1,55 @@
> +/*
> + * Mapping of DWARF debug register numbers into register names.
> + *
> + * Copyright (C) 2010 Matt Fleming <matt@...sole-pimps.org>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
> + *
> + */
> +
> +#include <libio.h>
> +#include <dwarf-regs.h>
> +
> +/*
> + * Generic dwarf analysis helpers
> + */
> +
> +#define SH_MAX_REGS 18
> +const char *sh_regs_table[SH_MAX_REGS] = {
> +	"r0",
> +	"r1",
> +	"r2",
> +	"r3",
> +	"r4",
> +	"r5",
> +	"r6",
> +	"r7",
> +	"r8",
> +	"r9",
> +	"r10",
> +	"r11",
> +	"r12",
> +	"r13",
> +	"r14",
> +	"r15",
> +	"pc",
> +	"pr",
> +};
> +
> +/* Return architecture dependent register string (for kprobe-tracer) */
> +const char *get_arch_regstr(unsigned int n)
> +{
> +	return (n <= SH_MAX_REGS) ? sh_regs_table[n] : NULL;
> +}

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