Use a less misleading name for the code that sets up the main thread.

Change-Id: I50c1b0a3b633cf8bc40a6bd86f12adb6b91e2888

libc/bionic/libc_init_common.cpp

@@ -64,18 +64,15 @@ char** environ;
 // Declared in "private/bionic_ssp.h".
 uintptr_t __stack_chk_guard = 0;
 
-/* Init TLS for the initial thread. Called by the linker _before_ libc is mapped
- * in memory. Beware: all writes to libc globals from this function will
- * apply to linker-private copies and will not be visible from libc later on.
- *
- * Note: this function creates a pthread_internal_t for the initial thread and
- * stores the pointer in TLS, but does not add it to pthread's thread list. This
- * has to be done later from libc itself (see __libc_init_common).
- *
- * This function also stores a pointer to the kernel argument block in a TLS slot to be
- * picked up by the libc constructor.
- */
-void __libc_init_tls(KernelArgumentBlock& args) {
+// Setup for the main thread. For dynamic executables, this is called by the
+// linker _before_ libc is mapped in memory. This means that all writes to
+// globals from this function will apply to linker-private copies and will not
+// be visible from libc later on.
+//
+// Note: this function creates a pthread_internal_t for the initial thread and
+// stores the pointer in TLS, but does not add it to pthread's thread list. This
+// has to be done later from libc itself (see __libc_init_common).
+void __libc_init_main_thread(KernelArgumentBlock& args) {
   __libc_auxv = args.auxv;
 
   static pthread_internal_t main_thread;
@@ -99,6 +96,9 @@ void __libc_init_tls(KernelArgumentBlock& args) {
   __init_thread(&main_thread);
   __init_tls(&main_thread);
   __set_tls(main_thread.tls);
+
+  // Store a pointer to the kernel argument block in a TLS slot to be
+  // picked up by the libc constructor.
   main_thread.tls[TLS_SLOT_BIONIC_PREINIT] = &args;
 
   __init_alternate_signal_stack(&main_thread);

libc/bionic/libc_init_static.cpp

@@ -90,7 +90,7 @@ __noreturn void __libc_init(void* raw_args,
                             int (*slingshot)(int, char**, char**),
                             structors_array_t const * const structors) {
   KernelArgumentBlock args(raw_args);
-  __libc_init_tls(args);
+  __libc_init_main_thread(args);
   __libc_init_AT_SECURE(args);
   __libc_init_common(args);
 

libc/private/bionic_tls.h

@@ -114,7 +114,7 @@ __END_DECLS
 
 #if defined(__cplusplus)
 class KernelArgumentBlock;
-extern __LIBC_HIDDEN__ void __libc_init_tls(KernelArgumentBlock& args);
+extern __LIBC_HIDDEN__ void __libc_init_main_thread(KernelArgumentBlock& args);
 #endif
 
 #endif /* __BIONIC_PRIVATE_BIONIC_TLS_H_ */

linker/linker.cpp

@@ -3465,7 +3465,7 @@ extern "C" ElfW(Addr) __linker_init(void* raw_args) {
     _exit(EXIT_FAILURE);
   }
 
-  __libc_init_tls(args);
+  __libc_init_main_thread(args);
 
   // Initialize the linker's own global variables
   linker_so.call_constructors();