From: Roland McGrath <roland@redhat.com>
Date: Thu, 19 Jul 2007 08:48:36 +0000 (-0700)
Subject: i386: Put allocated ELF notes in read-only data segment
X-Git-Tag: v2.6.23-rc1~394
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cbe87121f1545bb3e98ae114519bf0c4db27d6ab;p=linux-2.6

i386: Put allocated ELF notes in read-only data segment

This changes the i386 linker script and the asm-generic macro it uses so that
ELF note sections with SHF_ALLOC set are linked into the kernel image along
with other read-only data.  The PT_NOTE also points to their location.

This paves the way for putting useful build-time information into ELF notes
that can be found easily later in a kernel memory dump.

Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/arch/i386/kernel/vmlinux.lds.S b/arch/i386/kernel/vmlinux.lds.S
index 4dc44b8007..7d72cce005 100644
--- a/arch/i386/kernel/vmlinux.lds.S
+++ b/arch/i386/kernel/vmlinux.lds.S
@@ -60,7 +60,9 @@ SECTIONS
   	__stop___ex_table = .;
   }
 
-  BUG_TABLE
+  NOTES :text :note
+
+  BUG_TABLE :text
 
   . = ALIGN(4);
   .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {
@@ -208,6 +210,4 @@ SECTIONS
   STABS_DEBUG
 
   DWARF_DEBUG
-
-  NOTES
 }
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index a2b09ed852..0240e0506a 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -224,7 +224,11 @@
 	}
 
 #define NOTES								\
-	.notes : { *(.note.*) } :note
+	.notes : AT(ADDR(.notes) - LOAD_OFFSET) {			\
+		VMLINUX_SYMBOL(__start_notes) = .;			\
+		*(.note.*)						\
+		VMLINUX_SYMBOL(__stop_notes) = .;			\
+	}
 
 #define INITCALLS							\
   	*(.initcall0.init)						\