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