Rename __bionic_clone_entry to __start_thread.

This seems a bit less obscure.

Change-Id: I7dc528c253b73c861694f67556ad8f919bf92136

libc/arch-arm/bionic/__bionic_clone.S

@@ -60,10 +60,10 @@ ENTRY(__bionic_clone)
     b       __set_errno
 
 1:  # The child.
-    # Setting lr to 0 will make the unwinder stop at __bionic_clone_entry
+    # Setting lr to 0 will make the unwinder stop at __start_thread
     mov    lr, #0
     ldr    r0, [sp, #-4]
     ldr    r1, [sp, #-8]
-    b      __bionic_clone_entry
+    b      __start_thread
 END(__bionic_clone)
 .hidden __bionic_clone

libc/arch-arm64/bionic/__bionic_clone.S

@@ -62,10 +62,10 @@ ENTRY(__bionic_clone)
 .L_bc_child:
     # We're in the child now. Set the end of the frame record chain...
     mov     x29, xzr
-    # Setting x30 to 0 will make the unwinder stop at __bionic_clone_entry
+    # Setting x30 to 0 will make the unwinder stop at __start_thread
     mov     x30, xzr
-    # ...and call __bionic_clone_entry with the 'fn' and 'arg' we stored on the child stack.
+    # ...and call __start_thread with the 'fn' and 'arg' we stored on the child stack.
     ldp     x0, x1, [sp, #-16]
-    b       __bionic_clone_entry
+    b       __start_thread
 END(__bionic_clone)
 .hidden __bionic_clone

libc/arch-mips/bionic/__bionic_clone.S

@@ -60,8 +60,8 @@ ENTRY(__bionic_clone)
         lw	a0,0(sp)	#  fn
         lw	a1,4(sp)	#  arg
 
-	# void __bionic_clone_entry(int (*func)(void*), void *arg)
-        la	t9,__bionic_clone_entry
+	# void __start_thread(int (*func)(void*), void *arg)
+        la	t9,__start_thread
         j	t9
 
 .L__error_bc:

libc/arch-mips64/bionic/__bionic_clone.S

@@ -78,10 +78,10 @@ LEAF(__bionic_clone, FRAMESZ)
 	# Clear return address in child so we don't unwind further.
 	li	ra,0
 
-	# void __bionic_clone_entry(int (*func)(void*), void *arg)
+	# void __start_thread(int (*func)(void*), void *arg)
 	PTR_L	a0,FRAME_FN(sp)		#  fn
 	PTR_L	a1,FRAME_ARG(sp)	#  arg
-	LA	t9,__bionic_clone_entry
+	LA	t9,__start_thread
 	RESTORE_GP64
 	/*
 	 * For O32 etc the child stack must have space for a0..a3 to be stored

libc/arch-x86/bionic/__bionic_clone.S

@@ -39,7 +39,7 @@ ENTRY(__bionic_clone)
 .L_bc_child:
         # We don't want anyone to unwind past this point.
         .cfi_undefined %eip
-        call    __bionic_clone_entry
+        call    __start_thread
         hlt
 
 .L_bc_parent:

libc/arch-x86_64/bionic/__bionic_clone.S

@@ -62,12 +62,12 @@ ENTRY(__bionic_clone)
         .cfi_undefined %rip
         .cfi_undefined %rbp
 
-        # We're in the child now, so call __bionic_clone_entry
+        # We're in the child now, so call __start_thread
         # with the arguments from the child stack moved into
         # the appropriate registers.
         popq    %rdi  # fn
         popq    %rsi  # arg
-        call    __bionic_clone_entry
+        call    __start_thread
         hlt
 
 .L_bc_parent:

libc/bionic/clone.cpp

@@ -35,7 +35,7 @@ extern "C" pid_t __bionic_clone(uint32_t flags, void* child_stack, int* parent_t
 extern "C" __noreturn void __exit(int status);
 
 // Called from the __bionic_clone assembler to call the thread function then exit.
-extern "C" __LIBC_HIDDEN__ void __bionic_clone_entry(int (*fn)(void*), void* arg) {
+extern "C" __LIBC_HIDDEN__ void __start_thread(int (*fn)(void*), void* arg) {
   int status = (*fn)(arg);
   __exit(status);
 }