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