1 /*
2  * Mapping of DWARF debug register numbers into register names.
3  *
4  * Copyright (C) 2010 Ian Munsie, IBM Corporation.
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  */
11 
12 #include <stddef.h>
13 #include <dwarf-regs.h>
14 
15 
16 struct pt_regs_dwarfnum {
17 	const char *name;
18 	unsigned int dwarfnum;
19 };
20 
21 #define STR(s) #s
22 #define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
23 #define GPR_DWARFNUM_NAME(num)	\
24 	{.name = STR(%gpr##num), .dwarfnum = num}
25 #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
26 
27 /*
28  * Reference:
29  * http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html
30  */
31 static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
32 	GPR_DWARFNUM_NAME(0),
33 	GPR_DWARFNUM_NAME(1),
34 	GPR_DWARFNUM_NAME(2),
35 	GPR_DWARFNUM_NAME(3),
36 	GPR_DWARFNUM_NAME(4),
37 	GPR_DWARFNUM_NAME(5),
38 	GPR_DWARFNUM_NAME(6),
39 	GPR_DWARFNUM_NAME(7),
40 	GPR_DWARFNUM_NAME(8),
41 	GPR_DWARFNUM_NAME(9),
42 	GPR_DWARFNUM_NAME(10),
43 	GPR_DWARFNUM_NAME(11),
44 	GPR_DWARFNUM_NAME(12),
45 	GPR_DWARFNUM_NAME(13),
46 	GPR_DWARFNUM_NAME(14),
47 	GPR_DWARFNUM_NAME(15),
48 	GPR_DWARFNUM_NAME(16),
49 	GPR_DWARFNUM_NAME(17),
50 	GPR_DWARFNUM_NAME(18),
51 	GPR_DWARFNUM_NAME(19),
52 	GPR_DWARFNUM_NAME(20),
53 	GPR_DWARFNUM_NAME(21),
54 	GPR_DWARFNUM_NAME(22),
55 	GPR_DWARFNUM_NAME(23),
56 	GPR_DWARFNUM_NAME(24),
57 	GPR_DWARFNUM_NAME(25),
58 	GPR_DWARFNUM_NAME(26),
59 	GPR_DWARFNUM_NAME(27),
60 	GPR_DWARFNUM_NAME(28),
61 	GPR_DWARFNUM_NAME(29),
62 	GPR_DWARFNUM_NAME(30),
63 	GPR_DWARFNUM_NAME(31),
64 	REG_DWARFNUM_NAME("%msr",   66),
65 	REG_DWARFNUM_NAME("%ctr",   109),
66 	REG_DWARFNUM_NAME("%link",  108),
67 	REG_DWARFNUM_NAME("%xer",   101),
68 	REG_DWARFNUM_NAME("%dar",   119),
69 	REG_DWARFNUM_NAME("%dsisr", 118),
70 	REG_DWARFNUM_END,
71 };
72 
73 /**
74  * get_arch_regstr() - lookup register name from it's DWARF register number
75  * @n:	the DWARF register number
76  *
77  * get_arch_regstr() returns the name of the register in struct
78  * regdwarfnum_table from it's DWARF register number. If the register is not
79  * found in the table, this returns NULL;
80  */
81 const char *get_arch_regstr(unsigned int n)
82 {
83 	const struct pt_regs_dwarfnum *roff;
84 	for (roff = regdwarfnum_table; roff->name != NULL; roff++)
85 		if (roff->dwarfnum == n)
86 			return roff->name;
87 	return NULL;
88 }
89