1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd.
4  * Mapping of DWARF debug register numbers into register names.
5  */
6 
7 #include <stddef.h>
8 #include <errno.h> /* for EINVAL */
9 #include <string.h> /* for strcmp */
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 REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
19 
20 struct pt_regs_dwarfnum riscv_dwarf_regs_table[] = {
21 	REG_DWARFNUM_NAME("%zero", 0),
22 	REG_DWARFNUM_NAME("%ra", 1),
23 	REG_DWARFNUM_NAME("%sp", 2),
24 	REG_DWARFNUM_NAME("%gp", 3),
25 	REG_DWARFNUM_NAME("%tp", 4),
26 	REG_DWARFNUM_NAME("%t0", 5),
27 	REG_DWARFNUM_NAME("%t1", 6),
28 	REG_DWARFNUM_NAME("%t2", 7),
29 	REG_DWARFNUM_NAME("%s0", 8),
30 	REG_DWARFNUM_NAME("%s1", 9),
31 	REG_DWARFNUM_NAME("%a0", 10),
32 	REG_DWARFNUM_NAME("%a1", 11),
33 	REG_DWARFNUM_NAME("%a2", 12),
34 	REG_DWARFNUM_NAME("%a3", 13),
35 	REG_DWARFNUM_NAME("%a4", 14),
36 	REG_DWARFNUM_NAME("%a5", 15),
37 	REG_DWARFNUM_NAME("%a6", 16),
38 	REG_DWARFNUM_NAME("%a7", 17),
39 	REG_DWARFNUM_NAME("%s2", 18),
40 	REG_DWARFNUM_NAME("%s3", 19),
41 	REG_DWARFNUM_NAME("%s4", 20),
42 	REG_DWARFNUM_NAME("%s5", 21),
43 	REG_DWARFNUM_NAME("%s6", 22),
44 	REG_DWARFNUM_NAME("%s7", 23),
45 	REG_DWARFNUM_NAME("%s8", 24),
46 	REG_DWARFNUM_NAME("%s9", 25),
47 	REG_DWARFNUM_NAME("%s10", 26),
48 	REG_DWARFNUM_NAME("%s11", 27),
49 	REG_DWARFNUM_NAME("%t3", 28),
50 	REG_DWARFNUM_NAME("%t4", 29),
51 	REG_DWARFNUM_NAME("%t5", 30),
52 	REG_DWARFNUM_NAME("%t6", 31),
53 	REG_DWARFNUM_END,
54 };
55 
56 #define RISCV_MAX_REGS ((sizeof(riscv_dwarf_regs_table) / \
57 		 sizeof(riscv_dwarf_regs_table[0])) - 1)
58 
59 const char *get_arch_regstr(unsigned int n)
60 {
61 	return (n < RISCV_MAX_REGS) ? riscv_dwarf_regs_table[n].name : NULL;
62 }
63 
64 int regs_query_register_offset(const char *name)
65 {
66 	const struct pt_regs_dwarfnum *roff;
67 
68 	for (roff = riscv_dwarf_regs_table; roff->name; roff++)
69 		if (!strcmp(roff->name, name))
70 			return roff->dwarfnum;
71 	return -EINVAL;
72 }
73