From: Andy Lutomirski Date: Wed, 3 Aug 2011 13:31:51 +0000 (-0400) Subject: x86-64: Work around gold bug 13023 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f670bb760e7d32ec9c690e748a1d5d04921363ab;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git x86-64: Work around gold bug 13023 Gold has trouble assigning numbers to the location counter inside of an output section description. The bug was triggered by 9fd67b4ed0714ab718f1f9bd14c344af336a6df7, which consolidated all of the vsyscall sections into a single section. The workaround is IMO still nicer than the old way of doing it. This produces an apparently valid kernel image and passes my vdso tests on both GNU ld version 2.21.51.0.6-2.fc15 20110118 and GNU gold (version 2.21.51.0.6-2.fc15 20110118) 1.10 as distributed by Fedora 15. Signed-off-by: Andy Lutomirski Link: http://lkml.kernel.org/r/0b260cb806f1f9a25c00ce8377a5f035d57f557a.1312378163.git.luto@mit.edu Reported-by: Arkadiusz Miskiewicz Signed-off-by: H. Peter Anvin --- diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S index e79fb3951fce..8f3a265476d7 100644 --- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -158,10 +158,12 @@ SECTIONS __vvar_page = .; .vvar : AT(ADDR(.vvar) - LOAD_OFFSET) { + /* work around gold bug 13023 */ + __vvar_beginning_hack = .; - /* Place all vvars at the offsets in asm/vvar.h. */ -#define EMIT_VVAR(name, offset) \ - . = offset; \ + /* Place all vvars at the offsets in asm/vvar.h. */ +#define EMIT_VVAR(name, offset) \ + . = __vvar_beginning_hack + offset; \ *(.vvar_ ## name) #define __VVAR_KERNEL_LDS #include @@ -184,15 +186,17 @@ SECTIONS . = VSYSCALL_ADDR; .vsyscall : AT(VLOAD(.vsyscall)) { + /* work around gold bug 13023 */ + __vsyscall_beginning_hack = .; *(.vsyscall_0) - . = 1024; + . = __vsyscall_beginning_hack + 1024; *(.vsyscall_1) - . = 2048; + . = __vsyscall_beginning_hack + 2048; *(.vsyscall_2) - . = 4096; /* Pad the whole page. */ + . = __vsyscall_beginning_hack + 4096; /* Pad the whole page. */ } :user =0xcc . = ALIGN(__vsyscall_0 + PAGE_SIZE, PAGE_SIZE);