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    SubjectRe: [PATCH v4 2/2] perf probe: Add PowerPC DWARF register number mappings
    Ian Munsie wrote:
    > From: Ian Munsie <imunsie@au.ibm.com>
    >
    > This patch adds mappings from the register numbers from DWARF to the
    > register names used in the PowerPC Regs and Stack Access API. This
    > allows perf probe to be used to record variable contents on PowerPC.
    >
    > This patch depends on functionality in the powerpc/next tree, though it
    > will compile fine without it. Specifically this patch depends on commit
    > "powerpc: Add kprobe-based event tracer"
    >
    > Signed-off-by: Ian Munsie <imunsie@au.ibm.com>


    Acked-by: Masami Hiramatsu <mhiramat@redhat.com>

    > ---
    > Changes since v3:
    > * Fix NO_DWARF build

    Nice catch!

    >
    > tools/perf/arch/powerpc/Makefile | 4 +
    > tools/perf/arch/powerpc/util/dwarf-regs.c | 88 +++++++++++++++++++++++++++++
    > 2 files changed, 92 insertions(+), 0 deletions(-)
    > create mode 100644 tools/perf/arch/powerpc/Makefile
    > create mode 100644 tools/perf/arch/powerpc/util/dwarf-regs.c
    >
    > diff --git a/tools/perf/arch/powerpc/Makefile b/tools/perf/arch/powerpc/Makefile
    > new file mode 100644
    > index 0000000..15130b5
    > --- /dev/null
    > +++ b/tools/perf/arch/powerpc/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/powerpc/util/dwarf-regs.c b/tools/perf/arch/powerpc/util/dwarf-regs.c
    > new file mode 100644
    > index 0000000..48ae0c5
    > --- /dev/null
    > +++ b/tools/perf/arch/powerpc/util/dwarf-regs.c
    > @@ -0,0 +1,88 @@
    > +/*
    > + * Mapping of DWARF debug register numbers into register names.
    > + *
    > + * Copyright (C) 2010 Ian Munsie, IBM Corporation.
    > + *
    > + * 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.
    > + */
    > +
    > +#include <libio.h>
    > +#include <dwarf-regs.h>
    > +
    > +
    > +struct pt_regs_dwarfnum {
    > + const char *name;
    > + unsigned int dwarfnum;
    > +};
    > +
    > +#define STR(s) #s
    > +#define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
    > +#define GPR_DWARFNUM_NAME(num) \
    > + {.name = STR(%gpr##num), .dwarfnum = num}
    > +#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
    > +
    > +/*
    > + * Reference:
    > + * http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html
    > + */
    > +static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
    > + GPR_DWARFNUM_NAME(0),
    > + GPR_DWARFNUM_NAME(1),
    > + GPR_DWARFNUM_NAME(2),
    > + GPR_DWARFNUM_NAME(3),
    > + GPR_DWARFNUM_NAME(4),
    > + GPR_DWARFNUM_NAME(5),
    > + GPR_DWARFNUM_NAME(6),
    > + GPR_DWARFNUM_NAME(7),
    > + GPR_DWARFNUM_NAME(8),
    > + GPR_DWARFNUM_NAME(9),
    > + GPR_DWARFNUM_NAME(10),
    > + GPR_DWARFNUM_NAME(11),
    > + GPR_DWARFNUM_NAME(12),
    > + GPR_DWARFNUM_NAME(13),
    > + GPR_DWARFNUM_NAME(14),
    > + GPR_DWARFNUM_NAME(15),
    > + GPR_DWARFNUM_NAME(16),
    > + GPR_DWARFNUM_NAME(17),
    > + GPR_DWARFNUM_NAME(18),
    > + GPR_DWARFNUM_NAME(19),
    > + GPR_DWARFNUM_NAME(20),
    > + GPR_DWARFNUM_NAME(21),
    > + GPR_DWARFNUM_NAME(22),
    > + GPR_DWARFNUM_NAME(23),
    > + GPR_DWARFNUM_NAME(24),
    > + GPR_DWARFNUM_NAME(25),
    > + GPR_DWARFNUM_NAME(26),
    > + GPR_DWARFNUM_NAME(27),
    > + GPR_DWARFNUM_NAME(28),
    > + GPR_DWARFNUM_NAME(29),
    > + GPR_DWARFNUM_NAME(30),
    > + GPR_DWARFNUM_NAME(31),
    > + REG_DWARFNUM_NAME("%msr", 66),
    > + REG_DWARFNUM_NAME("%ctr", 109),
    > + REG_DWARFNUM_NAME("%link", 108),
    > + REG_DWARFNUM_NAME("%xer", 101),
    > + REG_DWARFNUM_NAME("%dar", 119),
    > + REG_DWARFNUM_NAME("%dsisr", 118),
    > + REG_DWARFNUM_END,
    > +};
    > +
    > +/**
    > + * get_arch_regstr() - lookup register name from it's DWARF register number
    > + * @n: the DWARF register number
    > + *
    > + * get_arch_regstr() returns the name of the register in struct
    > + * regdwarfnum_table from it's DWARF register number. If the register is not
    > + * found in the table, this returns NULL;
    > + */
    > +const char *get_arch_regstr(unsigned int n)
    > +{
    > + const struct pt_regs_dwarfnum *roff;
    > + for (roff = regdwarfnum_table; roff->name != NULL; roff++)
    > + if (roff->dwarfnum == n)
    > + return roff->name;
    > + return NULL;
    > +}

    --
    Masami Hiramatsu
    e-mail: mhiramat@redhat.com


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