1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * System call table mapper 4 * 5 * (C) 2016 Arnaldo Carvalho de Melo <acme@redhat.com> 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 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 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 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 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 79 void syscalltbl__delete(struct syscalltbl *tbl) 80 { 81 zfree(&tbl->syscalls.entries); 82 free(tbl); 83 } 84 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 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 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 } 105 106 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 } 120 121 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