1/* SPDX-License-Identifier: GPL-2.0 */ 2/* ld script to make ARM Linux kernel 3 * taken from the i386 version by Russell King 4 * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz> 5 */ 6 7/* No __ro_after_init data in the .rodata section - which will always be ro */ 8#define RO_AFTER_INIT_DATA 9 10#include <linux/sizes.h> 11 12#include <asm/vmlinux.lds.h> 13#include <asm/cache.h> 14#include <asm/thread_info.h> 15#include <asm/memory.h> 16#include <asm/mpu.h> 17#include <asm/page.h> 18 19OUTPUT_ARCH(arm) 20ENTRY(stext) 21 22#ifndef __ARMEB__ 23jiffies = jiffies_64; 24#else 25jiffies = jiffies_64 + 4; 26#endif 27 28SECTIONS 29{ 30 /* 31 * XXX: The linker does not define how output sections are 32 * assigned to input sections when there are multiple statements 33 * matching the same input section name. There is no documented 34 * order of matching. 35 * 36 * unwind exit sections must be discarded before the rest of the 37 * unwind sections get included. 38 */ 39 /DISCARD/ : { 40 ARM_DISCARD 41 *(.alt.smp.init) 42 *(.pv_table) 43#ifndef CONFIG_ARM_UNWIND 44 *(.ARM.exidx) *(.ARM.exidx.*) 45 *(.ARM.extab) *(.ARM.extab.*) 46#endif 47 } 48 49 . = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR); 50 _xiprom = .; /* XIP ROM area to be mapped */ 51 52 .head.text : { 53 _text = .; 54 HEAD_TEXT 55 } 56 57 .text : { /* Real text segment */ 58 _stext = .; /* Text and read-only data */ 59 ARM_TEXT 60 } 61 62 RO_DATA(PAGE_SIZE) 63 64 . = ALIGN(4); 65 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { 66 __start___ex_table = .; 67 ARM_MMU_KEEP(*(__ex_table)) 68 __stop___ex_table = .; 69 } 70 71#ifdef CONFIG_ARM_UNWIND 72 ARM_UNWIND_SECTIONS 73#endif 74 75 _etext = .; /* End of text and rodata section */ 76 77 ARM_VECTORS 78 INIT_TEXT_SECTION(8) 79 .exit.text : { 80 ARM_EXIT_KEEP(EXIT_TEXT) 81 } 82 .init.proc.info : { 83 ARM_CPU_DISCARD(PROC_INFO) 84 } 85 .init.arch.info : { 86 __arch_info_begin = .; 87 *(.arch.info.init) 88 __arch_info_end = .; 89 } 90 .init.tagtable : { 91 __tagtable_begin = .; 92 *(.taglist.init) 93 __tagtable_end = .; 94 } 95 .init.rodata : { 96 INIT_SETUP(16) 97 INIT_CALLS 98 CON_INITCALL 99 INIT_RAM_FS 100 } 101 102#ifdef CONFIG_ARM_MPU 103 . = ALIGN(SZ_128K); 104#endif 105 _exiprom = .; /* End of XIP ROM area */ 106 107/* 108 * From this point, stuff is considered writable and will be copied to RAM 109 */ 110 __data_loc = ALIGN(4); /* location in file */ 111 . = PAGE_OFFSET + TEXT_OFFSET; /* location in memory */ 112#undef LOAD_OFFSET 113#define LOAD_OFFSET (PAGE_OFFSET + TEXT_OFFSET - __data_loc) 114 115 . = ALIGN(THREAD_SIZE); 116 _sdata = .; 117 RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE) 118 .data.ro_after_init : AT(ADDR(.data.ro_after_init) - LOAD_OFFSET) { 119 *(.data..ro_after_init) 120 } 121 _edata = .; 122 123 . = ALIGN(PAGE_SIZE); 124 __init_begin = .; 125 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { 126 INIT_DATA 127 } 128 .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) { 129 ARM_EXIT_KEEP(EXIT_DATA) 130 } 131#ifdef CONFIG_SMP 132 PERCPU_SECTION(L1_CACHE_BYTES) 133#endif 134 135#ifdef CONFIG_HAVE_TCM 136 ARM_TCM 137#endif 138 139 /* 140 * End of copied data. We need a dummy section to get its LMA. 141 * Also located before final ALIGN() as trailing padding is not stored 142 * in the resulting binary file and useless to copy. 143 */ 144 .data.endmark : AT(ADDR(.data.endmark) - LOAD_OFFSET) { } 145 _edata_loc = LOADADDR(.data.endmark); 146 147 . = ALIGN(PAGE_SIZE); 148 __init_end = .; 149 150 BSS_SECTION(0, 0, 8) 151#ifdef CONFIG_ARM_MPU 152 . = ALIGN(PMSAv8_MINALIGN); 153#endif 154 _end = .; 155 156 STABS_DEBUG 157 DWARF_DEBUG 158 ARM_DETAILS 159 160 ARM_ASSERTS 161} 162 163/* 164 * These must never be empty 165 * If you have to comment these two assert statements out, your 166 * binutils is too old (for other reasons as well) 167 */ 168ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support") 169#ifndef CONFIG_COMPILE_TEST 170ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined") 171#endif 172 173#ifdef CONFIG_XIP_DEFLATED_DATA 174/* 175 * The .bss is used as a stack area for __inflate_kernel_data() whose stack 176 * frame is 9568 bytes. Make sure it has extra room left. 177 */ 178ASSERT((_end - __bss_start) >= 12288, ".bss too small for CONFIG_XIP_DEFLATED_DATA") 179#endif 180 181#if defined(CONFIG_ARM_MPU) && !defined(CONFIG_COMPILE_TEST) 182/* 183 * Due to PMSAv7 restriction on base address and size we have to 184 * enforce minimal alignment restrictions. It was seen that weaker 185 * alignment restriction on _xiprom will likely force XIP address 186 * space spawns multiple MPU regions thus it is likely we run in 187 * situation when we are reprogramming MPU region we run on with 188 * something which doesn't cover reprogramming code itself, so as soon 189 * as we update MPU settings we'd immediately try to execute straight 190 * from background region which is XN. 191 * It seem that alignment in 1M should suit most users. 192 * _exiprom is aligned as 1/8 of 1M so can be covered by subregion 193 * disable 194 */ 195ASSERT(!(_xiprom & (SZ_1M - 1)), "XIP start address may cause MPU programming issues") 196ASSERT(!(_exiprom & (SZ_128K - 1)), "XIP end address may cause MPU programming issues") 197#endif 198