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191 lines
4.5 KiB
191 lines
4.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* ld script to make ARM Linux kernel |
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* taken from the i386 version by Russell King |
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* Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz> |
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*/ |
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/* No __ro_after_init data in the .rodata section - which will always be ro */ |
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#define RO_AFTER_INIT_DATA |
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#include <linux/sizes.h> |
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#include <asm/vmlinux.lds.h> |
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#include <asm/cache.h> |
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#include <asm/thread_info.h> |
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#include <asm/memory.h> |
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#include <asm/mpu.h> |
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#include <asm/page.h> |
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OUTPUT_ARCH(arm) |
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ENTRY(stext) |
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#ifndef __ARMEB__ |
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jiffies = jiffies_64; |
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#else |
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jiffies = jiffies_64 + 4; |
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#endif |
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SECTIONS |
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{ |
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/* |
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* XXX: The linker does not define how output sections are |
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* assigned to input sections when there are multiple statements |
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* matching the same input section name. There is no documented |
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* order of matching. |
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* |
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* unwind exit sections must be discarded before the rest of the |
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* unwind sections get included. |
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*/ |
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/DISCARD/ : { |
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ARM_DISCARD |
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*(.alt.smp.init) |
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*(.pv_table) |
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} |
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. = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR); |
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_xiprom = .; /* XIP ROM area to be mapped */ |
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.head.text : { |
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_text = .; |
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HEAD_TEXT |
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} |
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.text : { /* Real text segment */ |
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_stext = .; /* Text and read-only data */ |
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ARM_TEXT |
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} |
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RO_DATA(PAGE_SIZE) |
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. = ALIGN(4); |
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__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { |
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__start___ex_table = .; |
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ARM_MMU_KEEP(*(__ex_table)) |
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__stop___ex_table = .; |
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} |
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#ifdef CONFIG_ARM_UNWIND |
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ARM_UNWIND_SECTIONS |
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#endif |
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_etext = .; /* End of text and rodata section */ |
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ARM_VECTORS |
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INIT_TEXT_SECTION(8) |
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.exit.text : { |
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ARM_EXIT_KEEP(EXIT_TEXT) |
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} |
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.init.proc.info : { |
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ARM_CPU_DISCARD(PROC_INFO) |
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} |
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.init.arch.info : { |
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__arch_info_begin = .; |
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*(.arch.info.init) |
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__arch_info_end = .; |
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} |
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.init.tagtable : { |
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__tagtable_begin = .; |
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*(.taglist.init) |
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__tagtable_end = .; |
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} |
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.init.rodata : { |
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INIT_SETUP(16) |
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INIT_CALLS |
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CON_INITCALL |
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INIT_RAM_FS |
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} |
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#ifdef CONFIG_ARM_MPU |
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. = ALIGN(SZ_128K); |
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#endif |
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_exiprom = .; /* End of XIP ROM area */ |
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/* |
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* From this point, stuff is considered writable and will be copied to RAM |
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*/ |
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__data_loc = ALIGN(4); /* location in file */ |
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. = PAGE_OFFSET + TEXT_OFFSET; /* location in memory */ |
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#undef LOAD_OFFSET |
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#define LOAD_OFFSET (PAGE_OFFSET + TEXT_OFFSET - __data_loc) |
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. = ALIGN(THREAD_SIZE); |
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_sdata = .; |
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RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE) |
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.data.ro_after_init : AT(ADDR(.data.ro_after_init) - LOAD_OFFSET) { |
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*(.data..ro_after_init) |
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} |
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_edata = .; |
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. = ALIGN(PAGE_SIZE); |
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__init_begin = .; |
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.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { |
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INIT_DATA |
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} |
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.exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) { |
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ARM_EXIT_KEEP(EXIT_DATA) |
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} |
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#ifdef CONFIG_SMP |
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PERCPU_SECTION(L1_CACHE_BYTES) |
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#endif |
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#ifdef CONFIG_HAVE_TCM |
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ARM_TCM |
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#endif |
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/* |
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* End of copied data. We need a dummy section to get its LMA. |
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* Also located before final ALIGN() as trailing padding is not stored |
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* in the resulting binary file and useless to copy. |
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*/ |
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.data.endmark : AT(ADDR(.data.endmark) - LOAD_OFFSET) { } |
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_edata_loc = LOADADDR(.data.endmark); |
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. = ALIGN(PAGE_SIZE); |
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__init_end = .; |
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BSS_SECTION(0, 0, 8) |
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#ifdef CONFIG_ARM_MPU |
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. = ALIGN(PMSAv8_MINALIGN); |
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#endif |
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_end = .; |
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STABS_DEBUG |
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DWARF_DEBUG |
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ARM_DETAILS |
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ARM_ASSERTS |
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} |
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/* |
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* These must never be empty |
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* If you have to comment these two assert statements out, your |
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* binutils is too old (for other reasons as well) |
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*/ |
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ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support") |
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ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined") |
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#ifdef CONFIG_XIP_DEFLATED_DATA |
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/* |
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* The .bss is used as a stack area for __inflate_kernel_data() whose stack |
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* frame is 9568 bytes. Make sure it has extra room left. |
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*/ |
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ASSERT((_end - __bss_start) >= 12288, ".bss too small for CONFIG_XIP_DEFLATED_DATA") |
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#endif |
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#ifdef CONFIG_ARM_MPU |
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/* |
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* Due to PMSAv7 restriction on base address and size we have to |
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* enforce minimal alignment restrictions. It was seen that weaker |
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* alignment restriction on _xiprom will likely force XIP address |
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* space spawns multiple MPU regions thus it is likely we run in |
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* situation when we are reprogramming MPU region we run on with |
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* something which doesn't cover reprogramming code itself, so as soon |
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* as we update MPU settings we'd immediately try to execute straight |
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* from background region which is XN. |
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* It seem that alignment in 1M should suit most users. |
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* _exiprom is aligned as 1/8 of 1M so can be covered by subregion |
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* disable |
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*/ |
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ASSERT(!(_xiprom & (SZ_1M - 1)), "XIP start address may cause MPU programming issues") |
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ASSERT(!(_exiprom & (SZ_128K - 1)), "XIP end address may cause MPU programming issues") |
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#endif
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