LXR linux/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
  12struct 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 */
  26static 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 */
  54const 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}
  62