aarch64: Add unwind information to _start (bug 26853)

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

Fixes bug 26853.

(cherry picked from commit 5edf3d9fd6efe06fda37b2a460e60690a90457a4)

diff --git a/NEWS b/NEWS
index 303073583995108b4686fd3f35feab7af9fb26a0..d2a484462bf4215c11cef2b335d41f512cdb7ae2 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -15,6 +15,7 @@ The following bugs are resolved with this release:
   [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
     by the caller to the kernel
   [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
+  [26853] aarch64: Missing unwind information in statically linked startup code
 
 Version 2.32
 

diff --git a/sysdeps/aarch64/start.S b/sysdeps/aarch64/start.S
index 75393e1c1809a36b5784878d91670bc3672f56b2..108f602721b42cac527a0be4f7e2733aec1dc59d 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