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