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    Subject[PATCH v4 2/2] perf probe: Add PowerPC DWARF register number mappings
    Date
    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>
    ---
    Changes since v3:
    * Fix NO_DWARF build

    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;
    +}
    --
    1.7.0


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