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
  16 struct 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  */
  34 static 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  */
  84 const 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
  93 int 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 }