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

   1 /*
   2  * Mapping of DWARF debug register numbers into register names.
   3  *
   4  * Copyright (C) 2010 Will Deacon, ARM Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <libio.h>
  12 #include <dwarf-regs.h>
  13
  14 struct pt_regs_dwarfnum {
  15         const char *name;
  16         unsigned int dwarfnum;
  17 };
  18
  19 #define STR(s) #s
  20 #define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
  21 #define GPR_DWARFNUM_NAME(num) \
  22         {.name = STR(%r##num), .dwarfnum = num}
  23 #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
  24
  25 /*
  26  * Reference:
  27  * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0040a/IHI0040A_aadwarf.pdf
  28  */
  29 static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
  30         GPR_DWARFNUM_NAME(0),
  31         GPR_DWARFNUM_NAME(1),
  32         GPR_DWARFNUM_NAME(2),
  33         GPR_DWARFNUM_NAME(3),
  34         GPR_DWARFNUM_NAME(4),
  35         GPR_DWARFNUM_NAME(5),
  36         GPR_DWARFNUM_NAME(6),
  37         GPR_DWARFNUM_NAME(7),
  38         GPR_DWARFNUM_NAME(8),
  39         GPR_DWARFNUM_NAME(9),
  40         GPR_DWARFNUM_NAME(10),
  41         REG_DWARFNUM_NAME("%fp", 11),
  42         REG_DWARFNUM_NAME("%ip", 12),
  43         REG_DWARFNUM_NAME("%sp", 13),
  44         REG_DWARFNUM_NAME("%lr", 14),
  45         REG_DWARFNUM_NAME("%pc", 15),
  46         REG_DWARFNUM_END,
  47 };
  48
  49 /**
  50  * get_arch_regstr() - lookup register name from it's DWARF register number
  51  * @n:  the DWARF register number
  52  *
  53  * get_arch_regstr() returns the name of the register in struct
  54  * regdwarfnum_table from it's DWARF register number. If the register is not
  55  * found in the table, this returns NULL;
  56  */
  57 const char *get_arch_regstr(unsigned int n)
  58 {
  59         const struct pt_regs_dwarfnum *roff;
  60         for (roff = regdwarfnum_table; roff->name != NULL; roff++)
  61                 if (roff->dwarfnum == n)
  62                         return roff->name;
  63         return NULL;
  64 }