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 <errno.h>
  14 #include <string.h>
  15 #include <dwarf-regs.h>
  16 #include <linux/ptrace.h>
  17 #include <linux/kernel.h>
  18 #include <linux/stringify.h>
  19 #include "util.h"
  20
  21 struct pt_regs_dwarfnum {
  22         const char *name;
  23         unsigned int dwarfnum;
  24         unsigned int ptregs_offset;
  25 };
  26
  27 #define REG_DWARFNUM_NAME(r, num)                                       \
  28                 {.name = __stringify(%)__stringify(r), .dwarfnum = num,                 \
  29                 .ptregs_offset = offsetof(struct pt_regs, r)}
  30 #define GPR_DWARFNUM_NAME(num)                                          \
  31                 {.name = __stringify(%gpr##num), .dwarfnum = num,               \
  32                 .ptregs_offset = offsetof(struct pt_regs, gpr[num])}
  33 #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0, .ptregs_offset = 0}
  34
  35 /*
  36  * Reference:
  37  * http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html
  38  */
  39 static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
  40         GPR_DWARFNUM_NAME(0),
  41         GPR_DWARFNUM_NAME(1),
  42         GPR_DWARFNUM_NAME(2),
  43         GPR_DWARFNUM_NAME(3),
  44         GPR_DWARFNUM_NAME(4),
  45         GPR_DWARFNUM_NAME(5),
  46         GPR_DWARFNUM_NAME(6),
  47         GPR_DWARFNUM_NAME(7),
  48         GPR_DWARFNUM_NAME(8),
  49         GPR_DWARFNUM_NAME(9),
  50         GPR_DWARFNUM_NAME(10),
  51         GPR_DWARFNUM_NAME(11),
  52         GPR_DWARFNUM_NAME(12),
  53         GPR_DWARFNUM_NAME(13),
  54         GPR_DWARFNUM_NAME(14),
  55         GPR_DWARFNUM_NAME(15),
  56         GPR_DWARFNUM_NAME(16),
  57         GPR_DWARFNUM_NAME(17),
  58         GPR_DWARFNUM_NAME(18),
  59         GPR_DWARFNUM_NAME(19),
  60         GPR_DWARFNUM_NAME(20),
  61         GPR_DWARFNUM_NAME(21),
  62         GPR_DWARFNUM_NAME(22),
  63         GPR_DWARFNUM_NAME(23),
  64         GPR_DWARFNUM_NAME(24),
  65         GPR_DWARFNUM_NAME(25),
  66         GPR_DWARFNUM_NAME(26),
  67         GPR_DWARFNUM_NAME(27),
  68         GPR_DWARFNUM_NAME(28),
  69         GPR_DWARFNUM_NAME(29),
  70         GPR_DWARFNUM_NAME(30),
  71         GPR_DWARFNUM_NAME(31),
  72         REG_DWARFNUM_NAME(msr,   66),
  73         REG_DWARFNUM_NAME(ctr,   109),
  74         REG_DWARFNUM_NAME(link,  108),
  75         REG_DWARFNUM_NAME(xer,   101),
  76         REG_DWARFNUM_NAME(dar,   119),
  77         REG_DWARFNUM_NAME(dsisr, 118),
  78         REG_DWARFNUM_END,
  79 };
  80
  81 /**
  82  * get_arch_regstr() - lookup register name from it's DWARF register number
  83  * @n:  the DWARF register number
  84  *
  85  * get_arch_regstr() returns the name of the register in struct
  86  * regdwarfnum_table from it's DWARF register number. If the register is not
  87  * found in the table, this returns NULL;
  88  */
  89 const char *get_arch_regstr(unsigned int n)
  90 {
  91         const struct pt_regs_dwarfnum *roff;
  92         for (roff = regdwarfnum_table; roff->name != NULL; roff++)
  93                 if (roff->dwarfnum == n)
  94                         return roff->name;
  95         return NULL;
  96 }
  97
  98 int regs_query_register_offset(const char *name)
  99 {
 100         const struct pt_regs_dwarfnum *roff;
 101         for (roff = regdwarfnum_table; roff->name != NULL; roff++)
 102                 if (!strcmp(roff->name, name))
 103                         return roff->ptregs_offset;
 104         return -EINVAL;
 105 }