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 <stdlib.h>
  12 #ifndef __UCLIBC__
  13 #include <libio.h>
  14 #endif
  15 #include <dwarf-regs.h>
  16
  17 struct pt_regs_dwarfnum {
  18         const char *name;
  19         unsigned int dwarfnum;
  20 };
  21
  22 #define STR(s) #s
  23 #define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
  24 #define GPR_DWARFNUM_NAME(num) \
  25         {.name = STR(%r##num), .dwarfnum = num}
  26 #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
  27
  28 /*
  29  * Reference:
  30  * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0040a/IHI0040A_aadwarf.pdf
  31  */
  32 static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
  33         GPR_DWARFNUM_NAME(0),
  34         GPR_DWARFNUM_NAME(1),
  35         GPR_DWARFNUM_NAME(2),
  36         GPR_DWARFNUM_NAME(3),
  37         GPR_DWARFNUM_NAME(4),
  38         GPR_DWARFNUM_NAME(5),
  39         GPR_DWARFNUM_NAME(6),
  40         GPR_DWARFNUM_NAME(7),
  41         GPR_DWARFNUM_NAME(8),
  42         GPR_DWARFNUM_NAME(9),
  43         GPR_DWARFNUM_NAME(10),
  44         REG_DWARFNUM_NAME("%fp", 11),
  45         REG_DWARFNUM_NAME("%ip", 12),
  46         REG_DWARFNUM_NAME("%sp", 13),
  47         REG_DWARFNUM_NAME("%lr", 14),
  48         REG_DWARFNUM_NAME("%pc", 15),
  49         REG_DWARFNUM_END,
  50 };
  51
  52 /**
  53  * get_arch_regstr() - lookup register name from it's DWARF register number
  54  * @n:  the DWARF register number
  55  *
  56  * get_arch_regstr() returns the name of the register in struct
  57  * regdwarfnum_table from it's DWARF register number. If the register is not
  58  * found in the table, this returns NULL;
  59  */
  60 const char *get_arch_regstr(unsigned int n)
  61 {
  62         const struct pt_regs_dwarfnum *roff;
  63         for (roff = regdwarfnum_table; roff->name != NULL; roff++)
  64                 if (roff->dwarfnum == n)
  65                         return roff->name;
  66         return NULL;
  67 }