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[POWERPC] Update linker script to properly set physical addresses

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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>
This commit is contained in:
Kumar Gala 2008-04-16 05:52:28 +10:00 committed by Paul Mackerras
parent d04ceb3fc2
commit 366234f657
2 changed files with 24 additions and 24 deletions
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47
arch/powerpc/kernel/vmlinux.lds.S
View File

@ -31,7 +31,7 @@ SECTIONS
*/
/* Text and gots */
.text : {
.text : AT(ADDR(.text) - LOAD_OFFSET) {
ALIGN_FUNCTION();
*(.text.head)
_text = .;
@ -56,7 +56,7 @@ SECTIONS
RODATA
/* Exception & bug tables */
__ex_table : {
__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
__start___ex_table = .;
*(__ex_table)
__stop___ex_table = .;
@ -72,7 +72,7 @@ SECTIONS
. = ALIGN(PAGE_SIZE);
__init_begin = .;
.init.text : {
.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
_sinittext = .;
INIT_TEXT
_einittext = .;
@ -81,11 +81,11 @@ SECTIONS
/* .exit.text is discarded at runtime, not link time,
* to deal with references from __bug_table
*/
.exit.text : {
.exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
EXIT_TEXT
}
.init.data : {
.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
INIT_DATA
__vtop_table_begin = .;
*(.vtop_fixup);
@ -101,19 +101,19 @@ SECTIONS
}
. = ALIGN(16);
.init.setup : {
.init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
__setup_start = .;
*(.init.setup)
__setup_end = .;
}
.initcall.init : {
.initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
__initcall_start = .;
INITCALLS
__initcall_end = .;
}
.con_initcall.init : {
.con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
__con_initcall_start = .;
*(.con_initcall.init)
__con_initcall_end = .;
@ -122,14 +122,14 @@ SECTIONS
SECURITY_INIT
. = ALIGN(8);
__ftr_fixup : {
__ftr_fixup : AT(ADDR(__ftr_fixup) - LOAD_OFFSET) {
__start___ftr_fixup = .;
*(__ftr_fixup)
__stop___ftr_fixup = .;
}
#ifdef CONFIG_PPC64
. = ALIGN(8);
__fw_ftr_fixup : {
__fw_ftr_fixup : AT(ADDR(__fw_ftr_fixup) - LOAD_OFFSET) {
__start___fw_ftr_fixup = .;
*(__fw_ftr_fixup)
__stop___fw_ftr_fixup = .;
@ -137,14 +137,14 @@ SECTIONS
#endif
#ifdef CONFIG_BLK_DEV_INITRD
. = ALIGN(PAGE_SIZE);
.init.ramfs : {
.init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
__initramfs_start = .;
*(.init.ramfs)
__initramfs_end = .;
}
#endif
. = ALIGN(PAGE_SIZE);
.data.percpu : {
.data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) {
__per_cpu_start = .;
*(.data.percpu)
*(.data.percpu.shared_aligned)
@ -152,7 +152,7 @@ SECTIONS
}
. = ALIGN(8);
.machine.desc : {
.machine.desc : AT(ADDR(.machine.desc) - LOAD_OFFSET) {
__machine_desc_start = . ;
*(.machine.desc)
__machine_desc_end = . ;
@ -170,25 +170,24 @@ SECTIONS
_sdata = .;
#ifdef CONFIG_PPC32
.data :
{
.data : AT(ADDR(.data) - LOAD_OFFSET) {
DATA_DATA
*(.sdata)
*(.got.plt) *(.got)
}
#else
.data : {
.data : AT(ADDR(.data) - LOAD_OFFSET) {
DATA_DATA
*(.data.rel*)
*(.toc1)
*(.branch_lt)
}
.opd : {
.opd : AT(ADDR(.opd) - LOAD_OFFSET) {
*(.opd)
}
.got : {
.got : AT(ADDR(.got) - LOAD_OFFSET) {
__toc_start = .;
*(.got)
*(.toc)
@ -205,26 +204,26 @@ SECTIONS
#else
. = ALIGN(16384);
#endif
.data.init_task : {
.data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
*(.data.init_task)
}
. = ALIGN(PAGE_SIZE);
.data.page_aligned : {
.data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
*(.data.page_aligned)
}
.data.cacheline_aligned : {
.data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
*(.data.cacheline_aligned)
}
. = ALIGN(L1_CACHE_BYTES);
.data.read_mostly : {
.data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
*(.data.read_mostly)
}
. = ALIGN(PAGE_SIZE);
__data_nosave : {
.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
__nosave_begin = .;
*(.data.nosave)
. = ALIGN(PAGE_SIZE);
@ -235,7 +234,7 @@ SECTIONS
* And finally the bss
*/
.bss : {
.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
__bss_start = .;
*(.sbss) *(.scommon)
*(.dynbss)

1
include/asm-powerpc/page.h
View File

@ -53,6 +53,7 @@
#define PAGE_OFFSET ASM_CONST(CONFIG_KERNEL_START)
#define KERNELBASE (PAGE_OFFSET + PHYSICAL_START)
#define LOAD_OFFSET PAGE_OFFSET
#ifdef CONFIG_FLATMEM
#define pfn_valid(pfn) ((pfn) < max_mapnr)