1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/compiler.h>
3 
4 static 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 
52 static 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