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    SubjectRe: [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@console-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@console-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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