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

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  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 }
 97 

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