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
  17 struct 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  */
  35 static 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  */
  85 const 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
  94 int 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 }