1// SPDX-License-Identifier: GPL-2.0
2#include <linux/compiler.h>
3
4static struct ins_ops *powerpc__associate_instruction_ops(struct arch *arch, const char *name)
5{
6	int i;
7	struct ins_ops *ops;
8
9	/*
10	 * - Interested only if instruction starts with 'b'.
11	 * - Few start with 'b', but aren't branch instructions.
12	 */
13	if (name[0] != 'b'             ||
14	    !strncmp(name, "bcd", 3)   ||
15	    !strncmp(name, "brinc", 5) ||
16	    !strncmp(name, "bper", 4))
17		return NULL;
18
19	ops = &jump_ops;
20
21	i = strlen(name) - 1;
22	if (i < 0)
23		return NULL;
24
25	/* ignore optional hints at the end of the instructions */
26	if (name[i] == '+' || name[i] == '-')
27		i--;
28
29	if (name[i] == 'l' || (name[i] == 'a' && name[i-1] == 'l')) {
30		/*
31		 * if the instruction ends up with 'l' or 'la', then
32		 * those are considered 'calls' since they update LR.
33		 * ... except for 'bnl' which is branch if not less than
34		 * and the absolute form of the same.
35		 */
36		if (strcmp(name, "bnl") && strcmp(name, "bnl+") &&
37		    strcmp(name, "bnl-") && strcmp(name, "bnla") &&
38		    strcmp(name, "bnla+") && strcmp(name, "bnla-"))
39			ops = &call_ops;
40	}
41	if (name[i] == 'r' && name[i-1] == 'l')
42		/*
43		 * instructions ending with 'lr' are considered to be
44		 * return instructions
45		 */
46		ops = &ret_ops;
47
48	arch__associate_ins_ops(arch, name, ops);
49	return ops;
50}
51
52static int powerpc__annotate_init(struct arch *arch, char *cpuid __maybe_unused)
53{
54	if (!arch->initialized) {
55		arch->initialized = true;
56		arch->associate_instruction_ops = powerpc__associate_instruction_ops;
57		arch->objdump.comment_char      = '#';
58	}
59
60	return 0;
61}
62