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-generic/vmlinux.lds.h> 13#include <asm/cache.h> 14#include <asm/thread_info.h> 15#include <asm/memory.h> 16#include <asm/page.h> 17 18#include "vmlinux.lds.h" 19 20OUTPUT_ARCH(arm) 21ENTRY(stext) 22 23#ifndef __ARMEB__ 24jiffies = jiffies_64; 25#else 26jiffies = jiffies_64 + 4; 27#endif 28 29SECTIONS 30{ 31 /* 32 * XXX: The linker does not define how output sections are 33 * assigned to input sections when there are multiple statements 34 * matching the same input section name. There is no documented 35 * order of matching. 36 * 37 * unwind exit sections must be discarded before the rest of the 38 * unwind sections get included. 39 */ 40 /DISCARD/ : { 41 ARM_DISCARD 42 *(.alt.smp.init) 43 *(.pv_table) 44 } 45 46 . = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR); 47 _xiprom = .; /* XIP ROM area to be mapped */ 48 49 .head.text : { 50 _text = .; 51 HEAD_TEXT 52 } 53 54 .text : { /* Real text segment */ 55 _stext = .; /* Text and read-only data */ 56 ARM_TEXT 57 } 58 59 RO_DATA(PAGE_SIZE) 60 61 . = ALIGN(4); 62 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { 63 __start___ex_table = .; 64 ARM_MMU_KEEP(*(__ex_table)) 65 __stop___ex_table = .; 66 } 67 68#ifdef CONFIG_ARM_UNWIND 69 ARM_UNWIND_SECTIONS 70#endif 71 72 NOTES 73 74 _etext = .; /* End of text and rodata section */ 75 76 ARM_VECTORS 77 INIT_TEXT_SECTION(8) 78 .exit.text : { 79 ARM_EXIT_KEEP(EXIT_TEXT) 80 } 81 .init.proc.info : { 82 ARM_CPU_DISCARD(PROC_INFO) 83 } 84 .init.arch.info : { 85 __arch_info_begin = .; 86 *(.arch.info.init) 87 __arch_info_end = .; 88 } 89 .init.tagtable : { 90 __tagtable_begin = .; 91 *(.taglist.init) 92 __tagtable_end = .; 93 } 94 .init.rodata : { 95 INIT_SETUP(16) 96 INIT_CALLS 97 CON_INITCALL 98 SECURITY_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_SECTION(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 _end = .; 152 153 STABS_DEBUG 154} 155 156/* 157 * These must never be empty 158 * If you have to comment these two assert statements out, your 159 * binutils is too old (for other reasons as well) 160 */ 161ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support") 162ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined") 163 164/* 165 * The HYP init code can't be more than a page long, 166 * and should not cross a page boundary. 167 * The above comment applies as well. 168 */ 169ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & PAGE_MASK) <= PAGE_SIZE, 170 "HYP init code too big or misaligned") 171 172#ifdef CONFIG_XIP_DEFLATED_DATA 173/* 174 * The .bss is used as a stack area for __inflate_kernel_data() whose stack 175 * frame is 9568 bytes. Make sure it has extra room left. 176 */ 177ASSERT((_end - __bss_start) >= 12288, ".bss too small for CONFIG_XIP_DEFLATED_DATA") 178#endif 179 180#ifdef CONFIG_ARM_MPU 181/* 182 * Due to PMSAv7 restriction on base address and size we have to 183 * enforce minimal alignment restrictions. It was seen that weaker 184 * alignment restriction on _xiprom will likely force XIP address 185 * space spawns multiple MPU regions thus it is likely we run in 186 * situation when we are reprogramming MPU region we run on with 187 * something which doesn't cover reprogramming code itself, so as soon 188 * as we update MPU settings we'd immediately try to execute straight 189 * from background region which is XN. 190 * It seem that alignment in 1M should suit most users. 191 * _exiprom is aligned as 1/8 of 1M so can be covered by subregion 192 * disable 193 */ 194ASSERT(!(_xiprom & (SZ_1M - 1)), "XIP start address may cause MPU programming issues") 195ASSERT(!(_exiprom & (SZ_128K - 1)), "XIP end address may cause MPU programming issues") 196#endif 197