[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>hifive-unleashed-5.1
Kumar Gala
Paul Mackerras
parent
d04ceb3fc2
commit
366234f657
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@ -31,7 +31,7 @@ SECTIONS
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*/
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/* Text and gots */
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.text : {
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.text : AT(ADDR(.text) - LOAD_OFFSET) {
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ALIGN_FUNCTION();
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*(.text.head)
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_text = .;
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@ -56,7 +56,7 @@ SECTIONS
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RODATA
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/* Exception & bug tables */
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__ex_table : {
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__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
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__start___ex_table = .;
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*(__ex_table)
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__stop___ex_table = .;
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@ -72,7 +72,7 @@ SECTIONS
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. = ALIGN(PAGE_SIZE);
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__init_begin = .;
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.init.text : {
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.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
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_sinittext = .;
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INIT_TEXT
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_einittext = .;
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@ -81,11 +81,11 @@ SECTIONS
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/* .exit.text is discarded at runtime, not link time,
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* to deal with references from __bug_table
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*/
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.exit.text : {
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.exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
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EXIT_TEXT
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}
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.init.data : {
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.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
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INIT_DATA
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__vtop_table_begin = .;
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*(.vtop_fixup);
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@ -101,19 +101,19 @@ SECTIONS
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}
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. = ALIGN(16);
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.init.setup : {
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.init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
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__setup_start = .;
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*(.init.setup)
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__setup_end = .;
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}
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.initcall.init : {
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.initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
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__initcall_start = .;
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INITCALLS
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__initcall_end = .;
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}
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.con_initcall.init : {
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.con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
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__con_initcall_start = .;
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*(.con_initcall.init)
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__con_initcall_end = .;
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@ -122,14 +122,14 @@ SECTIONS
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SECURITY_INIT
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. = ALIGN(8);
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__ftr_fixup : {
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__ftr_fixup : AT(ADDR(__ftr_fixup) - LOAD_OFFSET) {
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__start___ftr_fixup = .;
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*(__ftr_fixup)
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__stop___ftr_fixup = .;
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}
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#ifdef CONFIG_PPC64
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. = ALIGN(8);
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__fw_ftr_fixup : {
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__fw_ftr_fixup : AT(ADDR(__fw_ftr_fixup) - LOAD_OFFSET) {
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__start___fw_ftr_fixup = .;
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*(__fw_ftr_fixup)
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__stop___fw_ftr_fixup = .;
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@ -137,14 +137,14 @@ SECTIONS
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#endif
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#ifdef CONFIG_BLK_DEV_INITRD
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. = ALIGN(PAGE_SIZE);
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.init.ramfs : {
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.init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
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__initramfs_start = .;
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*(.init.ramfs)
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__initramfs_end = .;
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}
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#endif
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. = ALIGN(PAGE_SIZE);
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.data.percpu : {
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.data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) {
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__per_cpu_start = .;
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*(.data.percpu)
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*(.data.percpu.shared_aligned)
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@ -152,7 +152,7 @@ SECTIONS
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}
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. = ALIGN(8);
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.machine.desc : {
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.machine.desc : AT(ADDR(.machine.desc) - LOAD_OFFSET) {
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__machine_desc_start = . ;
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*(.machine.desc)
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__machine_desc_end = . ;
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@ -170,25 +170,24 @@ SECTIONS
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_sdata = .;
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#ifdef CONFIG_PPC32
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.data :
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{
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.data : AT(ADDR(.data) - LOAD_OFFSET) {
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DATA_DATA
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*(.sdata)
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*(.got.plt) *(.got)
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}
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#else
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.data : {
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.data : AT(ADDR(.data) - LOAD_OFFSET) {
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DATA_DATA
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*(.data.rel*)
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*(.toc1)
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*(.branch_lt)
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}
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.opd : {
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.opd : AT(ADDR(.opd) - LOAD_OFFSET) {
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*(.opd)
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}
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.got : {
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.got : AT(ADDR(.got) - LOAD_OFFSET) {
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__toc_start = .;
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*(.got)
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*(.toc)
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@ -205,26 +204,26 @@ SECTIONS
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#else
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. = ALIGN(16384);
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#endif
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.data.init_task : {
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.data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
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*(.data.init_task)
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}
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. = ALIGN(PAGE_SIZE);
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.data.page_aligned : {
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.data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
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*(.data.page_aligned)
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}
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.data.cacheline_aligned : {
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.data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
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*(.data.cacheline_aligned)
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}
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. = ALIGN(L1_CACHE_BYTES);
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.data.read_mostly : {
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.data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
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*(.data.read_mostly)
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}
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. = ALIGN(PAGE_SIZE);
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__data_nosave : {
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.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
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__nosave_begin = .;
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*(.data.nosave)
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. = ALIGN(PAGE_SIZE);
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@ -235,7 +234,7 @@ SECTIONS
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* And finally the bss
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*/
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.bss : {
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.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
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__bss_start = .;
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*(.sbss) *(.scommon)
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*(.dynbss)
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@ -53,6 +53,7 @@
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#define PAGE_OFFSET ASM_CONST(CONFIG_KERNEL_START)
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#define KERNELBASE (PAGE_OFFSET + PHYSICAL_START)
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#define LOAD_OFFSET PAGE_OFFSET
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#ifdef CONFIG_FLATMEM
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#define pfn_valid(pfn) ((pfn) < max_mapnr)
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