direct-io.hg

changeset 11439:6f36370e373a

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[LINUX] Move .bss declaration after .data.* in x86_64 linker script.

Older binutils (prior to 2.16) have a problem with the linker script resulting
from the change introducing explicit segment maps. Namely does the
respective linker not properly handle @nobits sections (i.e. .bss) sitting
between @progbits ones (i.e. .data.*). The .bss section must therefore
be moved past all initialized sections (as is already the case on i386).
Replacement patch attached.

From: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Ian Campbell <ian.campbell@xensource.com>
author Ian Campbell <ian.campbell@xensource.com>
date Sat Sep 09 20:48:16 2006 +0100 (2006-09-09)
parents 965df40965e5
children bfd00b317815
files patches/linux-2.6.16.13/x86_64-put-note-sections-into-a-pt_note-segment-in-vmlinux.patch
line diff
     1.1 --- a/patches/linux-2.6.16.13/x86_64-put-note-sections-into-a-pt_note-segment-in-vmlinux.patch	Fri Sep 08 16:45:39 2006 -0700
     1.2 +++ b/patches/linux-2.6.16.13/x86_64-put-note-sections-into-a-pt_note-segment-in-vmlinux.patch	Sat Sep 09 20:48:16 2006 +0100
     1.3 @@ -1,5 +1,3 @@
     1.4 -diff --git a/arch/x86_64/kernel/vmlinux.lds.S b/arch/x86_64/kernel/vmlinux.lds.S
     1.5 -index 7c4de31..ef418b3 100644
     1.6  --- a/arch/x86_64/kernel/vmlinux.lds.S
     1.7  +++ b/arch/x86_64/kernel/vmlinux.lds.S
     1.8  @@ -13,6 +13,12 @@ OUTPUT_FORMAT("elf64-x86-64", "elf64-x86
     1.9 @@ -24,7 +22,7 @@ index 7c4de31..ef418b3 100644
    1.10     				/* out-of-line lock text */
    1.11     .text.lock : AT(ADDR(.text.lock) - LOAD_OFFSET) { *(.text.lock) }
    1.12   
    1.13 -@@ -57,7 +63,7 @@ #endif
    1.14 +@@ -57,17 +63,10 @@ #endif
    1.15     .data : AT(ADDR(.data) - LOAD_OFFSET) {
    1.16   	*(.data)
    1.17   	CONSTRUCTORS
    1.18 @@ -33,7 +31,17 @@ index 7c4de31..ef418b3 100644
    1.19   
    1.20     _edata = .;			/* End of data section */
    1.21   
    1.22 -@@ -89,7 +95,7 @@ #define VVIRT_OFFSET (VSYSCALL_ADDR - VS
    1.23 +-  __bss_start = .;		/* BSS */
    1.24 +-  .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
    1.25 +-	*(.bss.page_aligned)	
    1.26 +-	*(.bss)
    1.27 +-	}
    1.28 +-  __bss_stop = .;
    1.29 +-
    1.30 +   . = ALIGN(PAGE_SIZE);
    1.31 +   . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
    1.32 +   .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
    1.33 +@@ -89,7 +88,7 @@ #define VVIRT_OFFSET (VSYSCALL_ADDR - VS
    1.34   #define VVIRT(x) (ADDR(x) - VVIRT_OFFSET)
    1.35   
    1.36     . = VSYSCALL_ADDR;
    1.37 @@ -42,7 +50,7 @@ index 7c4de31..ef418b3 100644
    1.38     __vsyscall_0 = VSYSCALL_VIRT_ADDR;
    1.39   
    1.40     . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
    1.41 -@@ -132,7 +138,7 @@ #undef VVIRT
    1.42 +@@ -132,7 +131,7 @@ #undef VVIRT
    1.43     . = ALIGN(8192);		/* init_task */
    1.44     .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
    1.45   	*(.data.init_task)
    1.46 @@ -51,7 +59,22 @@ index 7c4de31..ef418b3 100644
    1.47   
    1.48     . = ALIGN(4096);
    1.49     .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
    1.50 -@@ -235,4 +241,6 @@ #endif
    1.51 +@@ -222,6 +221,14 @@ SECTIONS
    1.52 +   . = ALIGN(4096);
    1.53 +   __nosave_end = .;
    1.54 + 
    1.55 ++  __bss_start = .;		/* BSS */
    1.56 ++  . = ALIGN(4096);
    1.57 ++  .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
    1.58 ++	*(.bss.page_aligned)
    1.59 ++	*(.bss)
    1.60 ++	}
    1.61 ++  __bss_stop = .;
    1.62 ++
    1.63 +   _end = . ;
    1.64 + 
    1.65 +   /* Sections to be discarded */
    1.66 +@@ -235,4 +242,6 @@ #endif
    1.67     STABS_DEBUG
    1.68   
    1.69     DWARF_DEBUG