023bf6f1b8
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>
299 lines
6.1 KiB
ArmAsm
299 lines
6.1 KiB
ArmAsm
#ifdef CONFIG_PPC64
|
|
#define PROVIDE32(x) PROVIDE(__unused__##x)
|
|
#else
|
|
#define PROVIDE32(x) PROVIDE(x)
|
|
#endif
|
|
#include <asm/page.h>
|
|
#include <asm-generic/vmlinux.lds.h>
|
|
#include <asm/cache.h>
|
|
|
|
ENTRY(_stext)
|
|
|
|
PHDRS {
|
|
kernel PT_LOAD FLAGS(7); /* RWX */
|
|
notes PT_NOTE FLAGS(0);
|
|
dummy PT_NOTE FLAGS(0);
|
|
|
|
/* binutils < 2.18 has a bug that makes it misbehave when taking an
|
|
ELF file with all segments at load address 0 as input. This
|
|
happens when running "strip" on vmlinux, because of the AT() magic
|
|
in this linker script. People using GCC >= 4.2 won't run into
|
|
this problem, because the "build-id" support will put some data
|
|
into the "notes" segment (at a non-zero load address).
|
|
|
|
To work around this, we force some data into both the "dummy"
|
|
segment and the kernel segment, so the dummy segment will get a
|
|
non-zero load address. It's not enough to always create the
|
|
"notes" segment, since if nothing gets assigned to it, its load
|
|
address will be zero. */
|
|
}
|
|
|
|
#ifdef CONFIG_PPC64
|
|
OUTPUT_ARCH(powerpc:common64)
|
|
jiffies = jiffies_64;
|
|
#else
|
|
OUTPUT_ARCH(powerpc:common)
|
|
jiffies = jiffies_64 + 4;
|
|
#endif
|
|
SECTIONS
|
|
{
|
|
. = KERNELBASE;
|
|
|
|
/*
|
|
* Text, read only data and other permanent read-only sections
|
|
*/
|
|
|
|
/* Text and gots */
|
|
.text : AT(ADDR(.text) - LOAD_OFFSET) {
|
|
ALIGN_FUNCTION();
|
|
HEAD_TEXT
|
|
_text = .;
|
|
/* careful! __ftr_alt_* sections need to be close to .text */
|
|
*(.text .fixup __ftr_alt_* .ref.text)
|
|
SCHED_TEXT
|
|
LOCK_TEXT
|
|
KPROBES_TEXT
|
|
IRQENTRY_TEXT
|
|
|
|
#ifdef CONFIG_PPC32
|
|
*(.got1)
|
|
__got2_start = .;
|
|
*(.got2)
|
|
__got2_end = .;
|
|
#endif /* CONFIG_PPC32 */
|
|
|
|
} :kernel
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
_etext = .;
|
|
PROVIDE32 (etext = .);
|
|
|
|
/* Read-only data */
|
|
RODATA
|
|
|
|
/* Exception & bug tables */
|
|
__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
|
|
__start___ex_table = .;
|
|
*(__ex_table)
|
|
__stop___ex_table = .;
|
|
}
|
|
|
|
NOTES :kernel :notes
|
|
|
|
/* The dummy segment contents for the bug workaround mentioned above
|
|
near PHDRS. */
|
|
.dummy : AT(ADDR(.dummy) - LOAD_OFFSET) {
|
|
LONG(0)
|
|
LONG(0)
|
|
LONG(0)
|
|
} :kernel :dummy
|
|
|
|
/*
|
|
* Init sections discarded at runtime
|
|
*/
|
|
. = ALIGN(PAGE_SIZE);
|
|
__init_begin = .;
|
|
|
|
.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
|
|
_sinittext = .;
|
|
INIT_TEXT
|
|
_einittext = .;
|
|
} :kernel
|
|
|
|
/* .exit.text is discarded at runtime, not link time,
|
|
* to deal with references from __bug_table
|
|
*/
|
|
.exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
|
|
EXIT_TEXT
|
|
}
|
|
|
|
.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
|
|
INIT_DATA
|
|
__vtop_table_begin = .;
|
|
*(.vtop_fixup);
|
|
__vtop_table_end = .;
|
|
__ptov_table_begin = .;
|
|
*(.ptov_fixup);
|
|
__ptov_table_end = .;
|
|
#ifdef CONFIG_PPC_ISERIES
|
|
__dt_strings_start = .;
|
|
*(.dt_strings);
|
|
__dt_strings_end = .;
|
|
#endif
|
|
}
|
|
|
|
. = ALIGN(16);
|
|
.init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
|
|
__setup_start = .;
|
|
*(.init.setup)
|
|
__setup_end = .;
|
|
}
|
|
|
|
.initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
|
|
__initcall_start = .;
|
|
INITCALLS
|
|
__initcall_end = .;
|
|
}
|
|
|
|
.con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
|
|
__con_initcall_start = .;
|
|
*(.con_initcall.init)
|
|
__con_initcall_end = .;
|
|
}
|
|
|
|
SECURITY_INIT
|
|
|
|
. = ALIGN(8);
|
|
__ftr_fixup : AT(ADDR(__ftr_fixup) - LOAD_OFFSET) {
|
|
__start___ftr_fixup = .;
|
|
*(__ftr_fixup)
|
|
__stop___ftr_fixup = .;
|
|
}
|
|
. = ALIGN(8);
|
|
__mmu_ftr_fixup : AT(ADDR(__mmu_ftr_fixup) - LOAD_OFFSET) {
|
|
__start___mmu_ftr_fixup = .;
|
|
*(__mmu_ftr_fixup)
|
|
__stop___mmu_ftr_fixup = .;
|
|
}
|
|
. = ALIGN(8);
|
|
__lwsync_fixup : AT(ADDR(__lwsync_fixup) - LOAD_OFFSET) {
|
|
__start___lwsync_fixup = .;
|
|
*(__lwsync_fixup)
|
|
__stop___lwsync_fixup = .;
|
|
}
|
|
#ifdef CONFIG_PPC64
|
|
. = ALIGN(8);
|
|
__fw_ftr_fixup : AT(ADDR(__fw_ftr_fixup) - LOAD_OFFSET) {
|
|
__start___fw_ftr_fixup = .;
|
|
*(__fw_ftr_fixup)
|
|
__stop___fw_ftr_fixup = .;
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
. = ALIGN(PAGE_SIZE);
|
|
.init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
|
|
__initramfs_start = .;
|
|
*(.init.ramfs)
|
|
__initramfs_end = .;
|
|
}
|
|
#endif
|
|
PERCPU(PAGE_SIZE)
|
|
|
|
. = ALIGN(8);
|
|
.machine.desc : AT(ADDR(.machine.desc) - LOAD_OFFSET) {
|
|
__machine_desc_start = . ;
|
|
*(.machine.desc)
|
|
__machine_desc_end = . ;
|
|
}
|
|
#ifdef CONFIG_RELOCATABLE
|
|
. = ALIGN(8);
|
|
.dynsym : AT(ADDR(.dynsym) - LOAD_OFFSET) { *(.dynsym) }
|
|
.dynstr : AT(ADDR(.dynstr) - LOAD_OFFSET) { *(.dynstr) }
|
|
.dynamic : AT(ADDR(.dynamic) - LOAD_OFFSET)
|
|
{
|
|
__dynamic_start = .;
|
|
*(.dynamic)
|
|
}
|
|
.hash : AT(ADDR(.hash) - LOAD_OFFSET) { *(.hash) }
|
|
.interp : AT(ADDR(.interp) - LOAD_OFFSET) { *(.interp) }
|
|
.rela.dyn : AT(ADDR(.rela.dyn) - LOAD_OFFSET)
|
|
{
|
|
__rela_dyn_start = .;
|
|
*(.rela*)
|
|
}
|
|
#endif
|
|
|
|
/* freed after init ends here */
|
|
. = ALIGN(PAGE_SIZE);
|
|
__init_end = .;
|
|
|
|
/*
|
|
* And now the various read/write data
|
|
*/
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
_sdata = .;
|
|
|
|
#ifdef CONFIG_PPC32
|
|
.data : AT(ADDR(.data) - LOAD_OFFSET) {
|
|
DATA_DATA
|
|
*(.sdata)
|
|
*(.got.plt) *(.got)
|
|
}
|
|
#else
|
|
.data : AT(ADDR(.data) - LOAD_OFFSET) {
|
|
DATA_DATA
|
|
*(.data.rel*)
|
|
*(.toc1)
|
|
*(.branch_lt)
|
|
}
|
|
|
|
.opd : AT(ADDR(.opd) - LOAD_OFFSET) {
|
|
*(.opd)
|
|
}
|
|
|
|
.got : AT(ADDR(.got) - LOAD_OFFSET) {
|
|
__toc_start = .;
|
|
*(.got)
|
|
*(.toc)
|
|
}
|
|
#endif
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
_edata = .;
|
|
PROVIDE32 (edata = .);
|
|
|
|
/* The initial task and kernel stack */
|
|
#ifdef CONFIG_PPC32
|
|
. = ALIGN(8192);
|
|
#else
|
|
. = ALIGN(16384);
|
|
#endif
|
|
.data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
|
|
*(.data.init_task)
|
|
}
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
.data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
|
|
*(.data.page_aligned)
|
|
}
|
|
|
|
. = ALIGN(L1_CACHE_BYTES);
|
|
.data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
|
|
*(.data.cacheline_aligned)
|
|
}
|
|
|
|
. = ALIGN(L1_CACHE_BYTES);
|
|
.data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
|
|
*(.data.read_mostly)
|
|
}
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
|
|
__nosave_begin = .;
|
|
*(.data.nosave)
|
|
. = ALIGN(PAGE_SIZE);
|
|
__nosave_end = .;
|
|
}
|
|
|
|
/*
|
|
* And finally the bss
|
|
*/
|
|
|
|
.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
|
|
__bss_start = .;
|
|
*(.sbss) *(.scommon)
|
|
*(.dynbss)
|
|
*(.bss)
|
|
*(COMMON)
|
|
__bss_stop = .;
|
|
}
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
_end = . ;
|
|
PROVIDE32 (end = .);
|
|
|
|
/* Sections to be discarded. */
|
|
DISCARDS
|
|
}
|