1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Mapping of DWARF debug register numbers into register names.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2010 Ian Munsie, IBM Corporation.
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <stddef.h>
9*4882a593Smuzhiyun #include <errno.h>
10*4882a593Smuzhiyun #include <string.h>
11*4882a593Smuzhiyun #include <dwarf-regs.h>
12*4882a593Smuzhiyun #include <linux/ptrace.h>
13*4882a593Smuzhiyun #include <linux/kernel.h>
14*4882a593Smuzhiyun #include <linux/stringify.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun struct pt_regs_dwarfnum {
17*4882a593Smuzhiyun const char *name;
18*4882a593Smuzhiyun unsigned int dwarfnum;
19*4882a593Smuzhiyun unsigned int ptregs_offset;
20*4882a593Smuzhiyun };
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun #define REG_DWARFNUM_NAME(r, num) \
23*4882a593Smuzhiyun {.name = __stringify(%)__stringify(r), .dwarfnum = num, \
24*4882a593Smuzhiyun .ptregs_offset = offsetof(struct pt_regs, r)}
25*4882a593Smuzhiyun #define GPR_DWARFNUM_NAME(num) \
26*4882a593Smuzhiyun {.name = __stringify(%gpr##num), .dwarfnum = num, \
27*4882a593Smuzhiyun .ptregs_offset = offsetof(struct pt_regs, gpr[num])}
28*4882a593Smuzhiyun #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0, .ptregs_offset = 0}
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun /*
31*4882a593Smuzhiyun * Reference:
32*4882a593Smuzhiyun * http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html
33*4882a593Smuzhiyun */
34*4882a593Smuzhiyun static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
35*4882a593Smuzhiyun GPR_DWARFNUM_NAME(0),
36*4882a593Smuzhiyun GPR_DWARFNUM_NAME(1),
37*4882a593Smuzhiyun GPR_DWARFNUM_NAME(2),
38*4882a593Smuzhiyun GPR_DWARFNUM_NAME(3),
39*4882a593Smuzhiyun GPR_DWARFNUM_NAME(4),
40*4882a593Smuzhiyun GPR_DWARFNUM_NAME(5),
41*4882a593Smuzhiyun GPR_DWARFNUM_NAME(6),
42*4882a593Smuzhiyun GPR_DWARFNUM_NAME(7),
43*4882a593Smuzhiyun GPR_DWARFNUM_NAME(8),
44*4882a593Smuzhiyun GPR_DWARFNUM_NAME(9),
45*4882a593Smuzhiyun GPR_DWARFNUM_NAME(10),
46*4882a593Smuzhiyun GPR_DWARFNUM_NAME(11),
47*4882a593Smuzhiyun GPR_DWARFNUM_NAME(12),
48*4882a593Smuzhiyun GPR_DWARFNUM_NAME(13),
49*4882a593Smuzhiyun GPR_DWARFNUM_NAME(14),
50*4882a593Smuzhiyun GPR_DWARFNUM_NAME(15),
51*4882a593Smuzhiyun GPR_DWARFNUM_NAME(16),
52*4882a593Smuzhiyun GPR_DWARFNUM_NAME(17),
53*4882a593Smuzhiyun GPR_DWARFNUM_NAME(18),
54*4882a593Smuzhiyun GPR_DWARFNUM_NAME(19),
55*4882a593Smuzhiyun GPR_DWARFNUM_NAME(20),
56*4882a593Smuzhiyun GPR_DWARFNUM_NAME(21),
57*4882a593Smuzhiyun GPR_DWARFNUM_NAME(22),
58*4882a593Smuzhiyun GPR_DWARFNUM_NAME(23),
59*4882a593Smuzhiyun GPR_DWARFNUM_NAME(24),
60*4882a593Smuzhiyun GPR_DWARFNUM_NAME(25),
61*4882a593Smuzhiyun GPR_DWARFNUM_NAME(26),
62*4882a593Smuzhiyun GPR_DWARFNUM_NAME(27),
63*4882a593Smuzhiyun GPR_DWARFNUM_NAME(28),
64*4882a593Smuzhiyun GPR_DWARFNUM_NAME(29),
65*4882a593Smuzhiyun GPR_DWARFNUM_NAME(30),
66*4882a593Smuzhiyun GPR_DWARFNUM_NAME(31),
67*4882a593Smuzhiyun REG_DWARFNUM_NAME(msr, 66),
68*4882a593Smuzhiyun REG_DWARFNUM_NAME(ctr, 109),
69*4882a593Smuzhiyun REG_DWARFNUM_NAME(link, 108),
70*4882a593Smuzhiyun REG_DWARFNUM_NAME(xer, 101),
71*4882a593Smuzhiyun REG_DWARFNUM_NAME(dar, 119),
72*4882a593Smuzhiyun REG_DWARFNUM_NAME(dsisr, 118),
73*4882a593Smuzhiyun REG_DWARFNUM_END,
74*4882a593Smuzhiyun };
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun /**
77*4882a593Smuzhiyun * get_arch_regstr() - lookup register name from it's DWARF register number
78*4882a593Smuzhiyun * @n: the DWARF register number
79*4882a593Smuzhiyun *
80*4882a593Smuzhiyun * get_arch_regstr() returns the name of the register in struct
81*4882a593Smuzhiyun * regdwarfnum_table from it's DWARF register number. If the register is not
82*4882a593Smuzhiyun * found in the table, this returns NULL;
83*4882a593Smuzhiyun */
get_arch_regstr(unsigned int n)84*4882a593Smuzhiyun const char *get_arch_regstr(unsigned int n)
85*4882a593Smuzhiyun {
86*4882a593Smuzhiyun const struct pt_regs_dwarfnum *roff;
87*4882a593Smuzhiyun for (roff = regdwarfnum_table; roff->name != NULL; roff++)
88*4882a593Smuzhiyun if (roff->dwarfnum == n)
89*4882a593Smuzhiyun return roff->name;
90*4882a593Smuzhiyun return NULL;
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun
regs_query_register_offset(const char * name)93*4882a593Smuzhiyun int regs_query_register_offset(const char *name)
94*4882a593Smuzhiyun {
95*4882a593Smuzhiyun const struct pt_regs_dwarfnum *roff;
96*4882a593Smuzhiyun for (roff = regdwarfnum_table; roff->name != NULL; roff++)
97*4882a593Smuzhiyun if (!strcmp(roff->name, name))
98*4882a593Smuzhiyun return roff->ptregs_offset;
99*4882a593Smuzhiyun return -EINVAL;
100*4882a593Smuzhiyun }
101