fdsan: expose the address of the table to the platform.

Let the debuggerd handler get the address of the fdsan table so that
crash_dump can parse it and print it out in tombstones.

Test: debuggerd `pidof adbd`
Change-Id: I2297200cae52d0ff24479dba55d1ab4938583501

libc/bionic/fdsan.cpp

@@ -139,6 +139,11 @@ static FdTable* GetFdTable() {
   return &__libc_shared_globals->fd_table;
 }
 
+// Exposed to the platform to allow crash_dump to print out the fd table.
+extern "C" void* android_fdsan_get_fd_table() {
+  return GetFdTable();
+}
+
 static FdEntry* GetFdEntry(int fd) {
   if (fd < 0) {
     return nullptr;

libc/libc.arm.map

@@ -1661,6 +1661,7 @@ LIBC_PLATFORM {
     __system_property_area_init;
     __system_property_set_filename;
     __system_property_update;
+    android_fdsan_get_fd_table;
     android_net_res_stats_get_info_for_net;
     android_net_res_stats_aggregate;
     android_net_res_stats_get_usable_servers;

libc/libc.arm64.map

@@ -1379,6 +1379,7 @@ LIBC_PLATFORM {
     __system_property_area_init;
     __system_property_set_filename;
     __system_property_update;
+    android_fdsan_get_fd_table;
     android_net_res_stats_get_info_for_net;
     android_net_res_stats_aggregate;
     android_net_res_stats_get_usable_servers;

libc/libc.map.txt

@@ -1687,6 +1687,7 @@ LIBC_PLATFORM {
     __system_property_area_init;
     __system_property_set_filename;
     __system_property_update;
+    android_fdsan_get_fd_table;
     android_net_res_stats_get_info_for_net;
     android_net_res_stats_aggregate;
     android_net_res_stats_get_usable_servers;

libc/libc.mips.map

@@ -1502,6 +1502,7 @@ LIBC_PLATFORM {
     __system_property_area_init;
     __system_property_set_filename;
     __system_property_update;
+    android_fdsan_get_fd_table;
     android_net_res_stats_get_info_for_net;
     android_net_res_stats_aggregate;
     android_net_res_stats_get_usable_servers;

libc/libc.mips64.map

@@ -1379,6 +1379,7 @@ LIBC_PLATFORM {
     __system_property_area_init;
     __system_property_set_filename;
     __system_property_update;
+    android_fdsan_get_fd_table;
     android_net_res_stats_get_info_for_net;
     android_net_res_stats_aggregate;
     android_net_res_stats_get_usable_servers;

libc/libc.x86.map

@@ -1501,6 +1501,7 @@ LIBC_PLATFORM {
     __system_property_area_init;
     __system_property_set_filename;
     __system_property_update;
+    android_fdsan_get_fd_table;
     android_net_res_stats_get_info_for_net;
     android_net_res_stats_aggregate;
     android_net_res_stats_get_usable_servers;

libc/libc.x86_64.map

@@ -1379,6 +1379,7 @@ LIBC_PLATFORM {
     __system_property_area_init;
     __system_property_set_filename;
     __system_property_update;
+    android_fdsan_get_fd_table;
     android_net_res_stats_get_info_for_net;
     android_net_res_stats_aggregate;
     android_net_res_stats_get_usable_servers;