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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Mapping of DWARF debug register numbers into register names.
   4  *
   5  * Copyright (C) 2010 Will Deacon, ARM Ltd.
   6  */
   7
   8 #include <stddef.h>
   9 #include <linux/stringify.h>
  10 #include <dwarf-regs.h>
  11
  12 struct pt_regs_dwarfnum {
  13         const char *name;
  14         unsigned int dwarfnum;
  15 };
  16
  17 #define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
  18 #define GPR_DWARFNUM_NAME(num) \
  19         {.name = __stringify(%r##num), .dwarfnum = num}
  20 #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
  21
  22 /*
  23  * Reference:
  24  * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0040a/IHI0040A_aadwarf.pdf
  25  */
  26 static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
  27         GPR_DWARFNUM_NAME(0),
  28         GPR_DWARFNUM_NAME(1),
  29         GPR_DWARFNUM_NAME(2),
  30         GPR_DWARFNUM_NAME(3),
  31         GPR_DWARFNUM_NAME(4),
  32         GPR_DWARFNUM_NAME(5),
  33         GPR_DWARFNUM_NAME(6),
  34         GPR_DWARFNUM_NAME(7),
  35         GPR_DWARFNUM_NAME(8),
  36         GPR_DWARFNUM_NAME(9),
  37         GPR_DWARFNUM_NAME(10),
  38         REG_DWARFNUM_NAME("%fp", 11),
  39         REG_DWARFNUM_NAME("%ip", 12),
  40         REG_DWARFNUM_NAME("%sp", 13),
  41         REG_DWARFNUM_NAME("%lr", 14),
  42         REG_DWARFNUM_NAME("%pc", 15),
  43         REG_DWARFNUM_END,
  44 };
  45
  46 /**
  47  * get_arch_regstr() - lookup register name from it's DWARF register number
  48  * @n:  the DWARF register number
  49  *
  50  * get_arch_regstr() returns the name of the register in struct
  51  * regdwarfnum_table from it's DWARF register number. If the register is not
  52  * found in the table, this returns NULL;
  53  */
  54 const char *get_arch_regstr(unsigned int n)
  55 {
  56         const struct pt_regs_dwarfnum *roff;
  57         for (roff = regdwarfnum_table; roff->name != NULL; roff++)
  58                 if (roff->dwarfnum == n)
  59                         return roff->name;
  60         return NULL;
  61 }