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
14struct 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 */
29static 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 */
57const 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