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 <errno.h> |
9 | #include <stddef.h> |
10 | #include <string.h> |
11 | #include <dwarf-regs.h> |
12 | #include <linux/ptrace.h> /* for struct user_pt_regs */ |
13 | #include <linux/stringify.h> |
14 | |
15 | struct pt_regs_dwarfnum { |
16 | const char *name; |
17 | unsigned int dwarfnum; |
18 | }; |
19 | |
20 | #define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num} |
21 | #define GPR_DWARFNUM_NAME(num) \ |
22 | {.name = __stringify(%x##num), .dwarfnum = num} |
23 | #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0} |
24 | #define DWARFNUM2OFFSET(index) \ |
25 | (index * sizeof((struct user_pt_regs *)0)->regs[0]) |
26 | |
27 | /* |
28 | * Reference: |
29 | * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0057b/IHI0057B_aadwarf64.pdf |
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 | REG_DWARFNUM_NAME("%lr" , 30), |
63 | REG_DWARFNUM_NAME("%sp" , 31), |
64 | REG_DWARFNUM_END, |
65 | }; |
66 | |
67 | /** |
68 | * get_arch_regstr() - lookup register name from it's DWARF register number |
69 | * @n: the DWARF register number |
70 | * |
71 | * get_arch_regstr() returns the name of the register in struct |
72 | * regdwarfnum_table from it's DWARF register number. If the register is not |
73 | * found in the table, this returns NULL; |
74 | */ |
75 | const char *get_arch_regstr(unsigned int n) |
76 | { |
77 | const struct pt_regs_dwarfnum *roff; |
78 | for (roff = regdwarfnum_table; roff->name != NULL; roff++) |
79 | if (roff->dwarfnum == n) |
80 | return roff->name; |
81 | return NULL; |
82 | } |
83 | |
84 | int regs_query_register_offset(const char *name) |
85 | { |
86 | const struct pt_regs_dwarfnum *roff; |
87 | |
88 | for (roff = regdwarfnum_table; roff->name != NULL; roff++) |
89 | if (!strcmp(roff->name, name)) |
90 | return DWARFNUM2OFFSET(roff->dwarfnum); |
91 | return -EINVAL; |
92 | } |
93 | |