tools/perf/arch/arm64/util/dwarf-regs.c

   1 /*
   2  * Mapping of DWARF debug register numbers into register names.
   3  *
   4  * Copyright (C) 2010 Will Deacon, ARM Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <errno.h>
  12 #include <stddef.h>
  13 #include <string.h>
  14 #include <dwarf-regs.h>
  15 #include <linux/ptrace.h> /* for struct user_pt_regs */
  16 #include <linux/stringify.h>
  17 #include "util.h"
  18
  19 struct pt_regs_dwarfnum {
  20         const char *name;
  21         unsigned int dwarfnum;
  22 };
  23
  24 #define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
  25 #define GPR_DWARFNUM_NAME(num) \
  26         {.name = __stringify(%x##num), .dwarfnum = num}
  27 #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
  28 #define DWARFNUM2OFFSET(index) \
  29         (index * sizeof((struct user_pt_regs *)0)->regs[0])
  30
  31 /*
  32  * Reference:
  33  * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0057b/IHI0057B_aadwarf64.pdf
  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         REG_DWARFNUM_NAME("%lr", 30),
  67         REG_DWARFNUM_NAME("%sp", 31),
  68         REG_DWARFNUM_END,
  69 };
  70
  71 /**
  72  * get_arch_regstr() - lookup register name from it's DWARF register number
  73  * @n:  the DWARF register number
  74  *
  75  * get_arch_regstr() returns the name of the register in struct
  76  * regdwarfnum_table from it's DWARF register number. If the register is not
  77  * found in the table, this returns NULL;
  78  */
  79 const char *get_arch_regstr(unsigned int n)
  80 {
  81         const struct pt_regs_dwarfnum *roff;
  82         for (roff = regdwarfnum_table; roff->name != NULL; roff++)
  83                 if (roff->dwarfnum == n)
  84                         return roff->name;
  85         return NULL;
  86 }
  87
  88 int regs_query_register_offset(const char *name)
  89 {
  90         const struct pt_regs_dwarfnum *roff;
  91
  92         for (roff = regdwarfnum_table; roff->name != NULL; roff++)
  93                 if (!strcmp(roff->name, name))
  94                         return DWARFNUM2OFFSET(roff->dwarfnum);
  95         return -EINVAL;
  96 }