[ARM] Ensure head text is always placed at the start of kernel

Commit 86c0baf123e474b6eb404798926ecf62b426bf3a highlighted that we
may end up with the head text placed elsewhere in the kernel image.
Introduce a new .text.head section to contain the initial kernel
startup code, and always place this section at the beginning of the
kernel image.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 7 insertions, 3 deletions

diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index faf32de5c5a..e4156e7868c 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -23,11 +23,15 @@ SECTIONS
 #else
         . = PAGE_OFFSET + TEXT_OFFSET;
 #endif
-        .init : {                       /* Init code and data           */
+        .text.head : {
                 _stext = .;
-                        _sinittext = .;
+                _sinittext = .;
+                *(.text.head)
+        }
+
+        .init : {                       /* Init code and data           */
                         *(.init.text)
-                        _einittext = .;
+                _einittext = .;
                 __proc_info_begin = .;
                         *(.proc.info.init)
                 __proc_info_end = .;