LXR linux/tools/perf/arch/powerpc/util/dwarf-regs.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Mapping of DWARF debug register numbers into register names.
   4 *
   5 * Copyright (C) 2010 Ian Munsie, IBM Corporation.
   6 */
   7
   8#include <stddef.h>
   9#include <errno.h>
  10#include <string.h>
  11#include <dwarf-regs.h>
  12#include <linux/ptrace.h>
  13#include <linux/kernel.h>
  14#include <linux/stringify.h>
  15#include "util.h"
  16
  17struct pt_regs_dwarfnum {
  18        const char *name;
  19        unsigned int dwarfnum;
  20        unsigned int ptregs_offset;
  21};
  22
  23#define REG_DWARFNUM_NAME(r, num)                                       \
  24                {.name = __stringify(%)__stringify(r), .dwarfnum = num,                 \
  25                .ptregs_offset = offsetof(struct pt_regs, r)}
  26#define GPR_DWARFNUM_NAME(num)                                          \
  27                {.name = __stringify(%gpr##num), .dwarfnum = num,               \
  28                .ptregs_offset = offsetof(struct pt_regs, gpr[num])}
  29#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0, .ptregs_offset = 0}
  30
  31/*
  32 * Reference:
  33 * http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html
  34 */
  35static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
  36        GPR_DWARFNUM_NAME(0),
  37        GPR_DWARFNUM_NAME(1),
  38        GPR_DWARFNUM_NAME(2),
  39        GPR_DWARFNUM_NAME(3),
  40        GPR_DWARFNUM_NAME(4),
  41        GPR_DWARFNUM_NAME(5),
  42        GPR_DWARFNUM_NAME(6),
  43        GPR_DWARFNUM_NAME(7),
  44        GPR_DWARFNUM_NAME(8),
  45        GPR_DWARFNUM_NAME(9),
  46        GPR_DWARFNUM_NAME(10),
  47        GPR_DWARFNUM_NAME(11),
  48        GPR_DWARFNUM_NAME(12),
  49        GPR_DWARFNUM_NAME(13),
  50        GPR_DWARFNUM_NAME(14),
  51        GPR_DWARFNUM_NAME(15),
  52        GPR_DWARFNUM_NAME(16),
  53        GPR_DWARFNUM_NAME(17),
  54        GPR_DWARFNUM_NAME(18),
  55        GPR_DWARFNUM_NAME(19),
  56        GPR_DWARFNUM_NAME(20),
  57        GPR_DWARFNUM_NAME(21),
  58        GPR_DWARFNUM_NAME(22),
  59        GPR_DWARFNUM_NAME(23),
  60        GPR_DWARFNUM_NAME(24),
  61        GPR_DWARFNUM_NAME(25),
  62        GPR_DWARFNUM_NAME(26),
  63        GPR_DWARFNUM_NAME(27),
  64        GPR_DWARFNUM_NAME(28),
  65        GPR_DWARFNUM_NAME(29),
  66        GPR_DWARFNUM_NAME(30),
  67        GPR_DWARFNUM_NAME(31),
  68        REG_DWARFNUM_NAME(msr,   66),
  69        REG_DWARFNUM_NAME(ctr,   109),
  70        REG_DWARFNUM_NAME(link,  108),
  71        REG_DWARFNUM_NAME(xer,   101),
  72        REG_DWARFNUM_NAME(dar,   119),
  73        REG_DWARFNUM_NAME(dsisr, 118),
  74        REG_DWARFNUM_END,
  75};
  76
  77/**
  78 * get_arch_regstr() - lookup register name from it's DWARF register number
  79 * @n:  the DWARF register number
  80 *
  81 * get_arch_regstr() returns the name of the register in struct
  82 * regdwarfnum_table from it's DWARF register number. If the register is not
  83 * found in the table, this returns NULL;
  84 */
  85const char *get_arch_regstr(unsigned int n)
  86{
  87        const struct pt_regs_dwarfnum *roff;
  88        for (roff = regdwarfnum_table; roff->name != NULL; roff++)
  89                if (roff->dwarfnum == n)
  90                        return roff->name;
  91        return NULL;
  92}
  93
  94int regs_query_register_offset(const char *name)
  95{
  96        const struct pt_regs_dwarfnum *roff;
  97        for (roff = regdwarfnum_table; roff->name != NULL; roff++)
  98                if (!strcmp(roff->name, name))
  99                        return roff->ptregs_offset;
 100        return -EINVAL;
 101}
 102