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WSL2-Linux-Kernel
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linker script: unify usage of discard definition 

Discarded sections in different archs share some commonality but have
considerable differences.  This led to linker script for each arch
implementing its own /DISCARD/ definition, which makes maintaining
tedious and adding new entries error-prone.

This patch makes all linker scripts to move discard definitions to the
end of the linker script and use the common DISCARDS macro.  As ld
uses the first matching section definition, archs can include default
discarded sections by including them earlier in the linker script.

ia64 is notable because it first throws away some ia64 specific
subsections and then include the rest of the sections into the final
image, so those sections must be discarded before the inclusion.

defconfig compile tested for x86, x86-64, powerpc, powerpc64, ia64,
alpha, sparc, sparc64 and s390.  Michal Simek tested microblaze.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Tested-by: Michal Simek <monstr@monstr.eu>
Cc: linux-arch@vger.kernel.org
Cc: Michal Simek <monstr@monstr.eu>
Cc: microblaze-uclinux@itee.uq.edu.au
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Tejun Heo 2009-07-09 11:27:40 +09:00
Родитель 1dcdd0911b
Коммит 023bf6f1b8
25 изменённых файлов: 80 добавлений и 155 удалений
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10
arch/alpha/kernel/vmlinux.lds.S
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@ -134,14 +134,6 @@ SECTIONS
__bss_stop = .;
_end = .;
/* Sections to be discarded */
/DISCARD/ : {
EXIT_TEXT
EXIT_DATA
*(.exitcall.exit)
*(.discard)
}
.mdebug 0 : {
*(.mdebug)
}
@ -151,4 +143,6 @@ SECTIONS
STABS_DEBUG
DWARF_DEBUG
DISCARDS
}

10
arch/avr32/kernel/vmlinux.lds.S
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@ -124,15 +124,11 @@ SECTIONS
_end = .;
}
DWARF_DEBUG
/* When something in the kernel is NOT compiled as a module, the module
* cleanup code and data are put into these segments. Both can then be
* thrown away, as cleanup code is never called unless it's a module.
*/
/DISCARD/ : {
EXIT_DATA
*(.exitcall.exit)
*(.discard)
}
DWARF_DEBUG
DISCARDS
}

6
arch/blackfin/kernel/vmlinux.lds.S
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@ -277,9 +277,5 @@ SECTIONS
DWARF_DEBUG
/DISCARD/ :
{
*(.exitcall.exit)
*(.discard)
}
DISCARDS
}

10
arch/cris/kernel/vmlinux.lds.S
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@ -140,13 +140,7 @@ SECTIONS
_end = .;
__end = .;
/* Sections to be discarded */
/DISCARD/ : {
EXIT_TEXT
EXIT_DATA
*(.exitcall.exit)
*(.discard)
}
dram_end = dram_start + (CONFIG_ETRAX_DRAM_SIZE - __CONFIG_ETRAX_VMEM_SIZE)*1024*1024;
DISCARDS
}

2
arch/frv/kernel/vmlinux.lds.S
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@ -178,7 +178,7 @@ SECTIONS
.comment 0 : { *(.comment) }
/DISCARD/ : { *(.discard) }
DISCARDS
}
__kernel_image_size_no_bss = __bss_start - __kernel_image_start;

6
arch/h8300/kernel/vmlinux.lds.S
Просмотреть файл

@ -152,10 +152,6 @@ SECTIONS
__end = . ;
__ramstart = .;
}
/DISCARD/ : {
*(.exitcall.exit)
*(.discard)
}
.romfs :
{
*(.romfs*)
@ -166,4 +162,6 @@ SECTIONS
COMMAND_START = . - 0x200 ;
__ramend = . ;
}
DISCARDS
}

17
arch/ia64/kernel/vmlinux.lds.S
Просмотреть файл

@ -24,15 +24,14 @@ PHDRS {
}
SECTIONS
{
/* Sections to be discarded */
/* unwind exit sections must be discarded before the rest of the
sections get included. */
/DISCARD/ : {
EXIT_TEXT
EXIT_DATA
*(.exitcall.exit)
*(.discard)
*(.IA_64.unwind.exit.text)
*(.IA_64.unwind_info.exit.text)
}
*(.comment)
*(.note)
}
v = PAGE_OFFSET; /* this symbol is here to make debugging easier... */
phys_start = _start - LOAD_OFFSET;
@ -317,7 +316,7 @@ SECTIONS
.debug_funcnames 0 : { *(.debug_funcnames) }
.debug_typenames 0 : { *(.debug_typenames) }
.debug_varnames 0 : { *(.debug_varnames) }
/* These must appear regardless of . */
/DISCARD/ : { *(.comment) }
/DISCARD/ : { *(.note) }
/* Default discards */
DISCARDS
}

11
arch/m32r/kernel/vmlinux.lds.S
Просмотреть файл

@ -120,14 +120,6 @@ SECTIONS
_end = . ;
/* Sections to be discarded */
/DISCARD/ : {
EXIT_TEXT
EXIT_DATA
*(.exitcall.exit)
*(.discard)
}
/* Stabs debugging sections. */
.stab 0 : { *(.stab) }
.stabstr 0 : { *(.stabstr) }
@ -136,4 +128,7 @@ SECTIONS
.stab.index 0 : { *(.stab.index) }
.stab.indexstr 0 : { *(.stab.indexstr) }
.comment 0 : { *(.comment) }
/* Sections to be discarded */
DISCARDS
}

11
arch/m68k/kernel/vmlinux-std.lds
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@ -82,14 +82,6 @@ SECTIONS
_end = . ;
/* Sections to be discarded */
/DISCARD/ : {
EXIT_TEXT
EXIT_DATA
*(.exitcall.exit)
*(.discard)
}
/* Stabs debugging sections. */
.stab 0 : { *(.stab) }
.stabstr 0 : { *(.stabstr) }
@ -98,4 +90,7 @@ SECTIONS
.stab.index 0 : { *(.stab.index) }
.stab.indexstr 0 : { *(.stab.indexstr) }
.comment 0 : { *(.comment) }
/* Sections to be discarded */
DISCARDS
}

10
arch/m68k/kernel/vmlinux-sun3.lds
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@ -77,14 +77,6 @@ __init_begin = .;
_end = . ;
/* Sections to be discarded */
/DISCARD/ : {
EXIT_TEXT
EXIT_DATA
*(.exitcall.exit)
*(.discard)
}
.crap : {
/* Stabs debugging sections. */
*(.stab)
@ -97,4 +89,6 @@ __init_begin = .;
*(.note)
}
/* Sections to be discarded */
DISCARDS
}

8
arch/m68knommu/kernel/vmlinux.lds.S
Просмотреть файл

@ -184,13 +184,6 @@ SECTIONS {
__init_end = .;
} > INIT
/DISCARD/ : {
EXIT_TEXT
EXIT_DATA
*(.exitcall.exit)
*(.discard)
}
.bss : {
. = ALIGN(4);
_sbss = . ;
@ -201,5 +194,6 @@ SECTIONS {
_end = . ;
} > BSS
DISCARDS
}

2
arch/microblaze/kernel/vmlinux.lds.S
Просмотреть файл

@ -163,5 +163,5 @@ SECTIONS {
. = ALIGN(4096);
_end = .;
/DISCARD/ : { *(.discard) }
DISCARDS
}

22
arch/mips/kernel/vmlinux.lds.S
Просмотреть файл

@ -176,18 +176,6 @@ SECTIONS
_end = . ;
/* Sections to be discarded */
/DISCARD/ : {
*(.exitcall.exit)
*(.discard)
/* ABI crap starts here */
*(.MIPS.options)
*(.options)
*(.pdr)
*(.reginfo)
}
/* These mark the ABI of the kernel for debuggers. */
.mdebug.abi32 : {
KEEP(*(.mdebug.abi32))
@ -213,4 +201,14 @@ SECTIONS
*(.gptab.bss)
*(.gptab.sbss)
}
/* Sections to be discarded */
DISCARDS
/DISCARD/ : {
/* ABI crap starts here */
*(.MIPS.options)
*(.options)
*(.pdr)
*(.reginfo)
}
}

9
arch/mn10300/kernel/vmlinux.lds.S
Просмотреть файл

@ -115,13 +115,10 @@ SECTIONS
. = ALIGN(PAGE_SIZE);
pg0 = .;
/* Sections to be discarded */
/DISCARD/ : {
EXIT_CALL
*(.discard)
}
STABS_DEBUG
DWARF_DEBUG
/* Sections to be discarded */
DISCARDS
}

9
arch/parisc/kernel/vmlinux.lds.S
Просмотреть файл

@ -237,10 +237,12 @@ SECTIONS
/* freed after init ends here */
_end = . ;
STABS_DEBUG
.note 0 : { *(.note) }
/* Sections to be discarded */
DISCARDS
/DISCARD/ : {
*(.exitcall.exit)
*(.discard)
#ifdef CONFIG_64BIT
/* temporary hack until binutils is fixed to not emit these
* for static binaries
@ -253,7 +255,4 @@ SECTIONS
*(.gnu.hash)
#endif
}
STABS_DEBUG
.note 0 : { *(.note) }
}

10
arch/powerpc/kernel/vmlinux.lds.S
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@ -37,13 +37,6 @@ jiffies = jiffies_64 + 4;
#endif
SECTIONS
{
/* Sections to be discarded. */
/DISCARD/ : {
*(.exitcall.exit)
*(.discard)
EXIT_DATA
}
. = KERNELBASE;
/*
@ -299,4 +292,7 @@ SECTIONS
. = ALIGN(PAGE_SIZE);
_end = . ;
PROVIDE32 (end = .);
/* Sections to be discarded. */
DISCARDS
}

10
arch/s390/kernel/vmlinux.lds.S
Просмотреть файл

@ -157,14 +157,10 @@ SECTIONS
_end = . ;
/* Sections to be discarded */
/DISCARD/ : {
EXIT_DATA
*(.exitcall.exit)
*(.discard)
}
/* Debugging sections. */
STABS_DEBUG
DWARF_DEBUG
/* Sections to be discarded */
DISCARDS
}

11
arch/sh/kernel/vmlinux.lds.S
Просмотреть файл

@ -163,17 +163,14 @@ SECTIONS
_end = . ;
}
STABS_DEBUG
DWARF_DEBUG
/*
* When something in the kernel is NOT compiled as a module, the
* module cleanup code and data are put into these segments. Both
* can then be thrown away, as cleanup code is never called unless
* it's a module.
*/
/DISCARD/ : {
*(.exitcall.exit)
*(.discard)
}
STABS_DEBUG
DWARF_DEBUG
DISCARDS
}

9
arch/sparc/kernel/vmlinux.lds.S
Просмотреть файл

@ -171,13 +171,8 @@ SECTIONS
}
_end = . ;
/DISCARD/ : {
EXIT_TEXT
EXIT_DATA
*(.exitcall.exit)
*(.discard)
}
STABS_DEBUG
DWARF_DEBUG
DISCARDS
}

5
arch/um/include/asm/common.lds.S
Просмотреть файл

@ -123,8 +123,3 @@
__initramfs_end = .;
}
/* Sections to be discarded */
/DISCARD/ : {
*(.exitcall.exit)
}

2
arch/um/kernel/dyn.lds.S
Просмотреть файл

@ -157,5 +157,5 @@ SECTIONS
DWARF_DEBUG
/DISCARD/ : { *(.discard) }
DISCARDS
}

2
arch/um/kernel/uml.lds.S
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@ -101,5 +101,5 @@ SECTIONS
DWARF_DEBUG
/DISCARD/ : { *(.discard) }
DISCARDS
}

11
arch/x86/kernel/vmlinux.lds.S
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@ -387,15 +387,12 @@ SECTIONS
_end = .;
}
/* Sections to be discarded */
/DISCARD/ : {
*(.exitcall.exit)
*(.eh_frame)
*(.discard)
}
STABS_DEBUG
DWARF_DEBUG
/* Sections to be discarded */
DISCARDS
/DISCARD/ : { *(.eh_frame) }
}

14
arch/xtensa/kernel/vmlinux.lds.S
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@ -280,16 +280,6 @@ SECTIONS
*(.ResetVector.text)
}
/* Sections to be discarded */
/DISCARD/ :
{
*(.exit.literal)
EXIT_TEXT
EXIT_DATA
*(.exitcall.exit)
*(.discard)
}
.xt.lit : { *(.xt.lit) }
.xt.prop : { *(.xt.prop) }
@ -322,4 +312,8 @@ SECTIONS
*(.xt.lit)
*(.gnu.linkonce.p*)
}
/* Sections to be discarded */
DISCARDS
/DISCARD/ : { *(.exit.literal) }
}

18
include/asm-generic/vmlinux.lds.h
Просмотреть файл

@ -35,13 +35,10 @@
* __bss_stop = .;
* _end = .;
*
* /DISCARD/ : {
* EXIT_TEXT
* EXIT_DATA
* EXIT_CALL
* }
* STABS_DEBUG
* DWARF_DEBUG
*
* DISCARDS // must be the last
* }
*
* [__init_begin, __init_end] is the init section that may be freed after init
@ -629,11 +626,20 @@
#define INIT_RAM_FS
#endif
/*
* Default discarded sections.
*
* Some archs want to discard exit text/data at runtime rather than
* link time due to cross-section references such as alt instructions,
* bug table, eh_frame, etc. DISCARDS must be the last of output
* section definitions so that such archs put those in earlier section
* definitions.
*/
#define DISCARDS \
/DISCARD/ : { \
EXIT_TEXT \
EXIT_DATA \
*(.exitcall.exit) \
EXIT_CALL \
*(.discard) \
}