1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * System call table mapper
4 *
5 * (C) 2016 Arnaldo Carvalho de Melo <[email protected]>
6 */
7
8 #include "syscalltbl.h"
9 #include <stdlib.h>
10 #include <linux/compiler.h>
11 #include <linux/zalloc.h>
12
13 #include <string.h>
14 #include "string2.h"
15
16 #include <syscall_table.h>
17 const int syscalltbl_native_max_id = SYSCALLTBL_MAX_ID;
18 static const char *const *syscalltbl_native = syscalltbl;
19
20 struct syscall {
21 int id;
22 const char *name;
23 };
24
syscallcmpname(const void * vkey,const void * ventry)25 static int syscallcmpname(const void *vkey, const void *ventry)
26 {
27 const char *key = vkey;
28 const struct syscall *entry = ventry;
29
30 return strcmp(key, entry->name);
31 }
32
syscallcmp(const void * va,const void * vb)33 static int syscallcmp(const void *va, const void *vb)
34 {
35 const struct syscall *a = va, *b = vb;
36
37 return strcmp(a->name, b->name);
38 }
39
syscalltbl__init_native(struct syscalltbl * tbl)40 static int syscalltbl__init_native(struct syscalltbl *tbl)
41 {
42 int nr_entries = 0, i, j;
43 struct syscall *entries;
44
45 for (i = 0; i <= syscalltbl_native_max_id; ++i)
46 if (syscalltbl_native[i])
47 ++nr_entries;
48
49 entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
50 if (tbl->syscalls.entries == NULL)
51 return -1;
52
53 for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
54 if (syscalltbl_native[i]) {
55 entries[j].name = syscalltbl_native[i];
56 entries[j].id = i;
57 ++j;
58 }
59 }
60
61 qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
62 tbl->syscalls.nr_entries = nr_entries;
63 tbl->syscalls.max_id = syscalltbl_native_max_id;
64 return 0;
65 }
66
syscalltbl__new(void)67 struct syscalltbl *syscalltbl__new(void)
68 {
69 struct syscalltbl *tbl = malloc(sizeof(*tbl));
70 if (tbl) {
71 if (syscalltbl__init_native(tbl)) {
72 free(tbl);
73 return NULL;
74 }
75 }
76 return tbl;
77 }
78
syscalltbl__delete(struct syscalltbl * tbl)79 void syscalltbl__delete(struct syscalltbl *tbl)
80 {
81 zfree(&tbl->syscalls.entries);
82 free(tbl);
83 }
84
syscalltbl__name(const struct syscalltbl * tbl __maybe_unused,int id)85 const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
86 {
87 return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
88 }
89
syscalltbl__id(struct syscalltbl * tbl,const char * name)90 int syscalltbl__id(struct syscalltbl *tbl, const char *name)
91 {
92 struct syscall *sc = bsearch(name, tbl->syscalls.entries,
93 tbl->syscalls.nr_entries, sizeof(*sc),
94 syscallcmpname);
95
96 return sc ? sc->id : -1;
97 }
98
syscalltbl__id_at_idx(struct syscalltbl * tbl,int idx)99 int syscalltbl__id_at_idx(struct syscalltbl *tbl, int idx)
100 {
101 struct syscall *syscalls = tbl->syscalls.entries;
102
103 return idx < tbl->syscalls.nr_entries ? syscalls[idx].id : -1;
104 }
105
syscalltbl__strglobmatch_next(struct syscalltbl * tbl,const char * syscall_glob,int * idx)106 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
107 {
108 int i;
109 struct syscall *syscalls = tbl->syscalls.entries;
110
111 for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {
112 if (strglobmatch(syscalls[i].name, syscall_glob)) {
113 *idx = i;
114 return syscalls[i].id;
115 }
116 }
117
118 return -1;
119 }
120
syscalltbl__strglobmatch_first(struct syscalltbl * tbl,const char * syscall_glob,int * idx)121 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
122 {
123 *idx = -1;
124 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
125 }
126