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