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
  15struct pt_regs_dwarfnum {
  16        const char *name;
  17        unsigned int dwarfnum;
  18};
  19
  20#define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
  21#define GPR_DWARFNUM_NAME(num) \
  22        {.name = __stringify(%x##num), .dwarfnum = num}
  23#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
  24#define DWARFNUM2OFFSET(index) \
  25        (index * sizeof((struct user_pt_regs *)0)->regs[0])
  26
  27/*
  28 * Reference:
  29 * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0057b/IHI0057B_aadwarf64.pdf
  30 */
  31static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
  32        GPR_DWARFNUM_NAME(0),
  33        GPR_DWARFNUM_NAME(1),
  34        GPR_DWARFNUM_NAME(2),
  35        GPR_DWARFNUM_NAME(3),
  36        GPR_DWARFNUM_NAME(4),
  37        GPR_DWARFNUM_NAME(5),
  38        GPR_DWARFNUM_NAME(6),
  39        GPR_DWARFNUM_NAME(7),
  40        GPR_DWARFNUM_NAME(8),
  41        GPR_DWARFNUM_NAME(9),
  42        GPR_DWARFNUM_NAME(10),
  43        GPR_DWARFNUM_NAME(11),
  44        GPR_DWARFNUM_NAME(12),
  45        GPR_DWARFNUM_NAME(13),
  46        GPR_DWARFNUM_NAME(14),
  47        GPR_DWARFNUM_NAME(15),
  48        GPR_DWARFNUM_NAME(16),
  49        GPR_DWARFNUM_NAME(17),
  50        GPR_DWARFNUM_NAME(18),
  51        GPR_DWARFNUM_NAME(19),
  52        GPR_DWARFNUM_NAME(20),
  53        GPR_DWARFNUM_NAME(21),
  54        GPR_DWARFNUM_NAME(22),
  55        GPR_DWARFNUM_NAME(23),
  56        GPR_DWARFNUM_NAME(24),
  57        GPR_DWARFNUM_NAME(25),
  58        GPR_DWARFNUM_NAME(26),
  59        GPR_DWARFNUM_NAME(27),
  60        GPR_DWARFNUM_NAME(28),
  61        GPR_DWARFNUM_NAME(29),
  62        REG_DWARFNUM_NAME("%lr", 30),
  63        REG_DWARFNUM_NAME("%sp", 31),
  64        REG_DWARFNUM_END,
  65};
  66
  67/**
  68 * get_arch_regstr() - lookup register name from it's DWARF register number
  69 * @n:  the DWARF register number
  70 *
  71 * get_arch_regstr() returns the name of the register in struct
  72 * regdwarfnum_table from it's DWARF register number. If the register is not
  73 * found in the table, this returns NULL;
  74 */
  75const char *get_arch_regstr(unsigned int n)
  76{
  77        const struct pt_regs_dwarfnum *roff;
  78        for (roff = regdwarfnum_table; roff->name != NULL; roff++)
  79                if (roff->dwarfnum == n)
  80                        return roff->name;
  81        return NULL;
  82}
  83
  84int regs_query_register_offset(const char *name)
  85{
  86        const struct pt_regs_dwarfnum *roff;
  87
  88        for (roff = regdwarfnum_table; roff->name != NULL; roff++)
  89                if (!strcmp(roff->name, name))
  90                        return DWARFNUM2OFFSET(roff->dwarfnum);
  91        return -EINVAL;
  92}
  93