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linux/arch/powerpc/kernel/vmlinux.lds.S
Kumar Gala 366234f657 [POWERPC] Update linker script to properly set physical addresses
We can set LOAD_OFFSET and use the AT attribute on sections and the
linker will properly set the physical address of the LOAD program
header for us.

This allows us to know how the PHYSICAL_START the user configured a
kernel with by just looking at the resulting vmlinux ELF.

This is pretty much stolen from how x86 does things in their linker
scripts.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-04-17 07:46:14 +10:00

250 lines
4.4 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)
#ifdef CONFIG_PPC64
OUTPUT_ARCH(powerpc:common64)
jiffies = jiffies_64;
#else
OUTPUT_ARCH(powerpc:common)
jiffies = jiffies_64 + 4;
#endif
SECTIONS
{
/* Sections to be discarded. */
/DISCARD/ : {
*(.exitcall.exit)
EXIT_DATA
}
. = KERNELBASE;
/*
* Text, read only data and other permanent read-only sections
*/
/* Text and gots */
.text : AT(ADDR(.text) - LOAD_OFFSET) {
ALIGN_FUNCTION();
*(.text.head)
_text = .;
*(.text .fixup .text.init.refok .exit.text.refok)
SCHED_TEXT
LOCK_TEXT
KPROBES_TEXT
#ifdef CONFIG_PPC32
*(.got1)
__got2_start = .;
*(.got2)
__got2_end = .;
#endif /* CONFIG_PPC32 */
. = 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
BUG_TABLE
/*
* Init sections discarded at runtime
*/
. = ALIGN(PAGE_SIZE);
__init_begin = .;
.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
_sinittext = .;
INIT_TEXT
_einittext = .;
}
/* .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 = .;
}
#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
. = ALIGN(PAGE_SIZE);
.data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) {
__per_cpu_start = .;
*(.data.percpu)
*(.data.percpu.shared_aligned)
__per_cpu_end = .;
}
. = ALIGN(8);
.machine.desc : AT(ADDR(.machine.desc) - LOAD_OFFSET) {
__machine_desc_start = . ;
*(.machine.desc)
__machine_desc_end = . ;
}
/* 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)
}
.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 = .);
}