From: Florian Weimer <fweimer@redhat.com>
Date: Mon, 9 Nov 2020 10:31:04 +0000 (+0100)
Subject: aarch64: Add unwind information to _start (bug 26853)
X-Git-Tag: glibc-2.33~324
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5edf3d9fd6efe06fda37b2a460e60690a90457a4;p=thirdparty%2Fglibc.git

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 75393e1c180..108f602721b 100644
--- 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