1 files changed, 112 insertions, 0 deletions
diff --git a/libcorkscrew/map_info.c b/libcorkscrew/map_info.c
new file mode 100644
index 0000000..60ed9b4
--- /dev/null
+++ b/libcorkscrew/map_info.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "Corkscrew"
+//#define LOG_NDEBUG 0
+
+#include <corkscrew/map_info.h>
+
+#include <ctype.h>
+#include <stdio.h>
+#include <string.h>
+#include <limits.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <cutils/log.h>
+
+// 6f000000-6f01e000 rwxp 00000000 00:0c 16389419   /system/lib/libcomposer.so\n
+// 012345678901234567890123456789012345678901234567890123456789
+// 0         1         2         3         4         5
+static map_info_t* parse_maps_line(const char* line)
+{
+    unsigned long int start;
+    unsigned long int end;
+    char permissions[5];
+    int name_pos;
+    if (sscanf(line, "%lx-%lx %4s %*x %*x:%*x %*d%n", &start, &end,
+            permissions, &name_pos) != 3) {
+        return NULL;
+    }
+
+    while (isspace(line[name_pos])) {
+        name_pos += 1;
+    }
+    const char* name = line + name_pos;
+    size_t name_len = strlen(name);
+    if (name_len && name[name_len - 1] == '\n') {
+        name_len -= 1;
+    }
+
+    map_info_t* mi = calloc(1, sizeof(map_info_t) + name_len + 1);
+    if (mi) {
+        mi->start = start;
+        mi->end = end;
+        mi->is_executable = strlen(permissions) == 4 && permissions[2] == 'x';
+        mi->data = NULL;
+        memcpy(mi->name, name, name_len);
+        mi->name[name_len] = '\0';
+    }
+    return mi;
+}
+
+map_info_t* load_map_info_list(pid_t tid) {
+    char path[PATH_MAX];
+    char line[1024];
+    FILE* fp;
+    map_info_t* milist = NULL;
+
+    snprintf(path, PATH_MAX, "/proc/%d/maps", tid);
+    fp = fopen(path, "r");
+    if (fp) {
+        while(fgets(line, sizeof(line), fp)) {
+            map_info_t* mi = parse_maps_line(line);
+            if (mi) {
+                mi->next = milist;
+                milist = mi;
+            }
+        }
+        fclose(fp);
+    }
+    return milist;
+}
+
+void free_map_info_list(map_info_t* milist) {
+    while (milist) {
+        map_info_t* next = milist->next;
+        free(milist);
+        milist = next;
+    }
+}
+
+const map_info_t* find_map_info(const map_info_t* milist, uintptr_t addr) {
+    const map_info_t* mi = milist;
+    while (mi && !(addr >= mi->start && addr < mi->end)) {
+        mi = mi->next;
+    }
+    return mi;
+}
+
+static pthread_once_t g_my_milist_once = PTHREAD_ONCE_INIT;
+static map_info_t* g_my_milist = NULL;
+
+static void init_my_milist_once() {
+    g_my_milist = load_map_info_list(getpid());
+}
+
+const map_info_t* my_map_info_list() {
+    pthread_once(&g_my_milist_once, init_my_milist_once);
+    return g_my_milist;
+}