instructions.c

 1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/compiler.h>
 3#include <linux/zalloc.h>
 4#include <errno.h>
 5#include <sys/types.h>
 6#include <regex.h>
 7#include <stdlib.h>
 8
 9struct arm_annotate {
10	regex_t call_insn,
11		jump_insn;
12};
13
14static struct ins_ops *arm__associate_instruction_ops(struct arch *arch, const char *name)
15{
16	struct arm_annotate *arm = arch->priv;
17	struct ins_ops *ops;
18	regmatch_t match[2];
19
20	if (!regexec(&arm->call_insn, name, 2, match, 0))
21		ops = &call_ops;
22	else if (!regexec(&arm->jump_insn, name, 2, match, 0))
23		ops = &jump_ops;
24	else
25		return NULL;
26
27	arch__associate_ins_ops(arch, name, ops);
28	return ops;
29}
30
31static int arm__annotate_init(struct arch *arch, char *cpuid __maybe_unused)
32{
33	struct arm_annotate *arm;
34	int err;
35
36	if (arch->initialized)
37		return 0;
38
39	arm = zalloc(sizeof(*arm));
40	if (!arm)
41		return ENOMEM;
42
43#define ARM_CONDS "(cc|cs|eq|ge|gt|hi|le|ls|lt|mi|ne|pl|vc|vs)"
44	err = regcomp(&arm->call_insn, "^blx?" ARM_CONDS "?$", REG_EXTENDED);
45	if (err)
46		goto out_free_arm;
47	err = regcomp(&arm->jump_insn, "^bx?" ARM_CONDS "?$", REG_EXTENDED);
48	if (err)
49		goto out_free_call;
50#undef ARM_CONDS
51
52	arch->initialized = true;
53	arch->priv	  = arm;
54	arch->associate_instruction_ops   = arm__associate_instruction_ops;
55	arch->objdump.comment_char	  = ';';
56	arch->objdump.skip_functions_char = '+';
57	arch->e_machine = EM_ARM;
58	arch->e_flags = 0;
59	return 0;
60
61out_free_call:
62	regfree(&arm->call_insn);
63out_free_arm:
64	free(arm);
65	return SYMBOL_ANNOTATE_ERRNO__ARCH_INIT_REGEXP;
66}