From 378ed3ccd2a0404d031e771b65aa3af221ea8aea Mon Sep 17 00:00:00 2001
From: Andy Lutomirski <luto@amacapital.net>
Date: Thu, 3 Apr 2014 10:53:43 -0700
Subject: [PATCH] x86, vdso: Make the vdso linker script compatible with Gold
Gold can't parse the script due to:
https://sourceware.org/bugzilla/show_bug.cgi?id=16804
With a workaround in place for that issue, Gold 2.23 crashes due to:
https://sourceware.org/bugzilla/show_bug.cgi?id=15355
This works around the former bug and avoids the second by removing
the unnecessary vvar and hpet sections and segments. The vdso and
hpet symbols are still there, and nothing needed the sections or
segments.
Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/243fa205098d112ec759c9b1b26785c09f399833.1396547532.git.luto@amacapital.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
arch/x86/vdso/vdso-layout.lds.S | 19 ++++++++-----------
1 file changed, 8 insertions(+), 11 deletions(-)
diff --git a/arch/x86/vdso/vdso-layout.lds.S b/arch/x86/vdso/vdso-layout.lds.S
index 2e263f367b13..9df017ab2285 100644
--- a/arch/x86/vdso/vdso-layout.lds.S
+++ b/arch/x86/vdso/vdso-layout.lds.S
@@ -9,12 +9,9 @@ SECTIONS
#ifdef BUILD_VDSO32
#include <asm/vdso32.h>
- .hpet_sect : {
- hpet_page = . - VDSO_OFFSET(VDSO_HPET_PAGE);
- } :text :hpet_sect
+ hpet_page = . - VDSO_OFFSET(VDSO_HPET_PAGE);
- .vvar_sect : {
- vvar = . - VDSO_OFFSET(VDSO_VVAR_PAGE);
+ vvar = . - VDSO_OFFSET(VDSO_VVAR_PAGE);
/* Place all vvars at the offsets in asm/vvar.h. */
#define EMIT_VVAR(name, offset) vvar_ ## name = vvar + offset;
@@ -22,7 +19,6 @@ SECTIONS
#include <asm/vvar.h>
#undef __VVAR_KERNEL_LDS
#undef EMIT_VVAR
- } :text :vvar_sect
#endif
. = SIZEOF_HEADERS;
@@ -61,7 +57,12 @@ SECTIONS
*/
. = ALIGN(0x100);
- .text : { *(.text*) } :text =0x90909090
+ .text : { *(.text*) } :text =0x90909090,
+
+ /*
+ * The comma above works around a bug in gold:
+ * https://sourceware.org/bugzilla/show_bug.cgi?id=16804
+ */
/DISCARD/ : {
*(.discard)
@@ -84,8 +85,4 @@ PHDRS
dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
note PT_NOTE FLAGS(4); /* PF_R */
eh_frame_hdr PT_GNU_EH_FRAME;
-#ifdef BUILD_VDSO32
- vvar_sect PT_NULL FLAGS(4); /* PF_R */
- hpet_sect PT_NULL FLAGS(4); /* PF_R */
-#endif
}
--
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