aarch64: Add unwind information to _start (bug 26853)

This adds CFI directives which communicate that the stack ends
with this function.

Fixes bug 26853.

diff --git a/sysdeps/aarch64/start.S b/sysdeps/aarch64/start.S
index 75393e1..108f602 100644 (file)
--- a/sysdeps/aarch64/start.S
+++ b/sysdeps/aarch64/start.S
@@ -43,11 +43,9 @@
  */
 
        .text
-       .globl _start
-       .type _start,#function
-_start:
-       BTI_C
+ENTRY(_start)
        /* Create an initial frame with 0 LR and FP */
+       cfi_undefined (x30)
        mov     x29, #0
        mov     x30, #0
 
@@ -103,6 +101,7 @@ _start:
 __wrap_main:
        b       main
 #endif
+END(_start)
 
        /* Define a symbol for the first piece of initialized data.  */
        .data