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(%r##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.ihi0040a/IHI0040A_aadwarf.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 REG_DWARFNUM_NAME("%fp", 11),
42 REG_DWARFNUM_NAME("%ip", 12),
43 REG_DWARFNUM_NAME("%sp", 13),
44 REG_DWARFNUM_NAME("%lr", 14),
45 REG_DWARFNUM_NAME("%pc", 15),
46 REG_DWARFNUM_END,
47 };
48
49 /**
50 * get_arch_regstr() - lookup register name from it's DWARF register number
51 * @n: the DWARF register number
52 *
53 * get_arch_regstr() returns the name of the register in struct
54 * regdwarfnum_table from it's DWARF register number. If the register is not
55 * found in the table, this returns NULL;
56 */
get_arch_regstr(unsigned int n)57 const char *get_arch_regstr(unsigned int n)
58 {
59 const struct pt_regs_dwarfnum *roff;
60 for (roff = regdwarfnum_table; roff->name != NULL; roff++)
61 if (roff->dwarfnum == n)
62 return roff->name;
63 return NULL;
64 }
65