1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Mapping of DWARF debug register numbers into register names.
4 *
5 * Copyright (C) 2010 Will Deacon, ARM Ltd.
6 */
7
8 #include <stddef.h>
9 #include <linux/stringify.h>
10 #include <dwarf-regs.h>
11
12 struct pt_regs_dwarfnum {
13 const char *name;
14 unsigned int dwarfnum;
15 };
16
17 #define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
18 #define GPR_DWARFNUM_NAME(num) \
19 {.name = __stringify(%r##num), .dwarfnum = num}
20 #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
21
22 /*
23 * Reference:
24 * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0040a/IHI0040A_aadwarf.pdf
25 */
26 static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
27 GPR_DWARFNUM_NAME(0),
28 GPR_DWARFNUM_NAME(1),
29 GPR_DWARFNUM_NAME(2),
30 GPR_DWARFNUM_NAME(3),
31 GPR_DWARFNUM_NAME(4),
32 GPR_DWARFNUM_NAME(5),
33 GPR_DWARFNUM_NAME(6),
34 GPR_DWARFNUM_NAME(7),
35 GPR_DWARFNUM_NAME(8),
36 GPR_DWARFNUM_NAME(9),
37 GPR_DWARFNUM_NAME(10),
38 REG_DWARFNUM_NAME("%fp", 11),
39 REG_DWARFNUM_NAME("%ip", 12),
40 REG_DWARFNUM_NAME("%sp", 13),
41 REG_DWARFNUM_NAME("%lr", 14),
42 REG_DWARFNUM_NAME("%pc", 15),
43 REG_DWARFNUM_END,
44 };
45
46 /**
47 * get_arch_regstr() - lookup register name from it's DWARF register number
48 * @n: the DWARF register number
49 *
50 * get_arch_regstr() returns the name of the register in struct
51 * regdwarfnum_table from it's DWARF register number. If the register is not
52 * found in the table, this returns NULL;
53 */
get_arch_regstr(unsigned int n)54 const char *get_arch_regstr(unsigned int n)
55 {
56 const struct pt_regs_dwarfnum *roff;
57 for (roff = regdwarfnum_table; roff->name != NULL; roff++)
58 if (roff->dwarfnum == n)
59 return roff->name;
60 return NULL;
61 }
62