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 */
get_arch_regstr(unsigned int n)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
regs_query_register_offset(const char * name)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
