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