tools/perf/arch/powerpc/util/dwarf-regs.c

   1 /*
   2  * Mapping of DWARF debug register numbers into register names.
   3  *
   4  * Copyright (C) 2010 Ian Munsie, IBM Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <stddef.h>
  13 #include <dwarf-regs.h>
  14
  15
  16 struct pt_regs_dwarfnum {
  17         const char *name;
  18         unsigned int dwarfnum;
  19 };
  20
  21 #define STR(s) #s
  22 #define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
  23 #define GPR_DWARFNUM_NAME(num)  \
  24         {.name = STR(%gpr##num), .dwarfnum = num}
  25 #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
  26
  27 /*
  28  * Reference:
  29  * http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html
  30  */
  31 static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
  32         GPR_DWARFNUM_NAME(0),
  33         GPR_DWARFNUM_NAME(1),
  34         GPR_DWARFNUM_NAME(2),
  35         GPR_DWARFNUM_NAME(3),
  36         GPR_DWARFNUM_NAME(4),
  37         GPR_DWARFNUM_NAME(5),
  38         GPR_DWARFNUM_NAME(6),
  39         GPR_DWARFNUM_NAME(7),
  40         GPR_DWARFNUM_NAME(8),
  41         GPR_DWARFNUM_NAME(9),
  42         GPR_DWARFNUM_NAME(10),
  43         GPR_DWARFNUM_NAME(11),
  44         GPR_DWARFNUM_NAME(12),
  45         GPR_DWARFNUM_NAME(13),
  46         GPR_DWARFNUM_NAME(14),
  47         GPR_DWARFNUM_NAME(15),
  48         GPR_DWARFNUM_NAME(16),
  49         GPR_DWARFNUM_NAME(17),
  50         GPR_DWARFNUM_NAME(18),
  51         GPR_DWARFNUM_NAME(19),
  52         GPR_DWARFNUM_NAME(20),
  53         GPR_DWARFNUM_NAME(21),
  54         GPR_DWARFNUM_NAME(22),
  55         GPR_DWARFNUM_NAME(23),
  56         GPR_DWARFNUM_NAME(24),
  57         GPR_DWARFNUM_NAME(25),
  58         GPR_DWARFNUM_NAME(26),
  59         GPR_DWARFNUM_NAME(27),
  60         GPR_DWARFNUM_NAME(28),
  61         GPR_DWARFNUM_NAME(29),
  62         GPR_DWARFNUM_NAME(30),
  63         GPR_DWARFNUM_NAME(31),
  64         REG_DWARFNUM_NAME("%msr",   66),
  65         REG_DWARFNUM_NAME("%ctr",   109),
  66         REG_DWARFNUM_NAME("%link",  108),
  67         REG_DWARFNUM_NAME("%xer",   101),
  68         REG_DWARFNUM_NAME("%dar",   119),
  69         REG_DWARFNUM_NAME("%dsisr", 118),
  70         REG_DWARFNUM_END,
  71 };
  72
  73 /**
  74  * get_arch_regstr() - lookup register name from it's DWARF register number
  75  * @n:  the DWARF register number
  76  *
  77  * get_arch_regstr() returns the name of the register in struct
  78  * regdwarfnum_table from it's DWARF register number. If the register is not
  79  * found in the table, this returns NULL;
  80  */
  81 const char *get_arch_regstr(unsigned int n)
  82 {
  83         const struct pt_regs_dwarfnum *roff;
  84         for (roff = regdwarfnum_table; roff->name != NULL; roff++)
  85                 if (roff->dwarfnum == n)
  86                         return roff->name;
  87         return NULL;
  88 }