LXR linux/tools/perf/arch/arm64/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 <errno.h>
   9#include <stddef.h>
  10#include <string.h>
  11#include <dwarf-regs.h>
  12#include <linux/ptrace.h> /* for struct user_pt_regs */
  13#include <linux/stringify.h>
  14#include "util.h"
  15
  16struct pt_regs_dwarfnum {
  17        const char *name;
  18        unsigned int dwarfnum;
  19};
  20
  21#define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
  22#define GPR_DWARFNUM_NAME(num) \
  23        {.name = __stringify(%x##num), .dwarfnum = num}
  24#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
  25#define DWARFNUM2OFFSET(index) \
  26        (index * sizeof((struct user_pt_regs *)0)->regs[0])
  27
  28/*
  29 * Reference:
  30 * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0057b/IHI0057B_aadwarf64.pdf
  31 */
  32static 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        GPR_DWARFNUM_NAME(11),
  45        GPR_DWARFNUM_NAME(12),
  46        GPR_DWARFNUM_NAME(13),
  47        GPR_DWARFNUM_NAME(14),
  48        GPR_DWARFNUM_NAME(15),
  49        GPR_DWARFNUM_NAME(16),
  50        GPR_DWARFNUM_NAME(17),
  51        GPR_DWARFNUM_NAME(18),
  52        GPR_DWARFNUM_NAME(19),
  53        GPR_DWARFNUM_NAME(20),
  54        GPR_DWARFNUM_NAME(21),
  55        GPR_DWARFNUM_NAME(22),
  56        GPR_DWARFNUM_NAME(23),
  57        GPR_DWARFNUM_NAME(24),
  58        GPR_DWARFNUM_NAME(25),
  59        GPR_DWARFNUM_NAME(26),
  60        GPR_DWARFNUM_NAME(27),
  61        GPR_DWARFNUM_NAME(28),
  62        GPR_DWARFNUM_NAME(29),
  63        REG_DWARFNUM_NAME("%lr", 30),
  64        REG_DWARFNUM_NAME("%sp", 31),
  65        REG_DWARFNUM_END,
  66};
  67
  68/**
  69 * get_arch_regstr() - lookup register name from it's DWARF register number
  70 * @n:  the DWARF register number
  71 *
  72 * get_arch_regstr() returns the name of the register in struct
  73 * regdwarfnum_table from it's DWARF register number. If the register is not
  74 * found in the table, this returns NULL;
  75 */
  76const char *get_arch_regstr(unsigned int n)
  77{
  78        const struct pt_regs_dwarfnum *roff;
  79        for (roff = regdwarfnum_table; roff->name != NULL; roff++)
  80                if (roff->dwarfnum == n)
  81                        return roff->name;
  82        return NULL;
  83}
  84
  85int regs_query_register_offset(const char *name)
  86{
  87        const struct pt_regs_dwarfnum *roff;
  88
  89        for (roff = regdwarfnum_table; roff->name != NULL; roff++)
  90                if (!strcmp(roff->name, name))
  91                        return DWARFNUM2OFFSET(roff->dwarfnum);
  92        return -EINVAL;
  93}
  94