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