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/page.h> 16#include <asm/mpu.h> 17 18OUTPUT_ARCH(arm) 19ENTRY(stext) 20 21#ifndef __ARMEB__ 22jiffies = jiffies_64; 23#else 24jiffies = jiffies_64 + 4; 25#endif 26 27SECTIONS 28{ 29 /* 30 * XXX: The linker does not define how output sections are 31 * assigned to input sections when there are multiple statements 32 * matching the same input section name. There is no documented 33 * order of matching. 34 * 35 * unwind exit sections must be discarded before the rest of the 36 * unwind sections get included. 37 */ 38 /DISCARD/ : { 39 ARM_DISCARD 40 *(.alt.smp.init) 41 *(.pv_table) 42#ifndef CONFIG_ARM_UNWIND 43 *(.ARM.exidx) *(.ARM.exidx.*) 44 *(.ARM.extab) *(.ARM.extab.*) 45#endif 46 } 47 48 . = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR); 49 _xiprom = .; /* XIP ROM area to be mapped */ 50 51 .head.text : { 52 _text = .; 53 HEAD_TEXT 54 } 55 56 .text : { /* Real text segment */ 57 _stext = .; /* Text and read-only data */ 58 ARM_TEXT 59 } 60 61 RO_DATA(PAGE_SIZE) 62 63 . = ALIGN(4); 64 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { 65 __start___ex_table = .; 66 ARM_MMU_KEEP(*(__ex_table)) 67 __stop___ex_table = .; 68 } 69 70#ifdef CONFIG_ARM_UNWIND 71 ARM_UNWIND_SECTIONS 72#endif 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 INIT_RAM_FS 99 } 100 101#ifdef CONFIG_ARM_MPU 102 . = ALIGN(SZ_128K); 103#endif 104 _exiprom = .; /* End of XIP ROM area */ 105 106/* 107 * From this point, stuff is considered writable and will be copied to RAM 108 */ 109 __data_loc = ALIGN(4); /* location in file */ 110 . = PAGE_OFFSET + TEXT_OFFSET; /* location in memory */ 111#undef LOAD_OFFSET 112#define LOAD_OFFSET (PAGE_OFFSET + TEXT_OFFSET - __data_loc) 113 114 . = ALIGN(THREAD_SIZE); 115 _sdata = .; 116 RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE) 117 .data.ro_after_init : AT(ADDR(.data.ro_after_init) - LOAD_OFFSET) { 118 *(.data..ro_after_init) 119 } 120 _edata = .; 121 122 . = ALIGN(PAGE_SIZE); 123 __init_begin = .; 124 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { 125 INIT_DATA 126 } 127 .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) { 128 ARM_EXIT_KEEP(EXIT_DATA) 129 } 130#ifdef CONFIG_SMP 131 PERCPU_SECTION(L1_CACHE_BYTES) 132#endif 133 134#ifdef CONFIG_HAVE_TCM 135 ARM_TCM 136#endif 137 138 /* 139 * End of copied data. We need a dummy section to get its LMA. 140 * Also located before final ALIGN() as trailing padding is not stored 141 * in the resulting binary file and useless to copy. 142 */ 143 .data.endmark : AT(ADDR(.data.endmark) - LOAD_OFFSET) { } 144 _edata_loc = LOADADDR(.data.endmark); 145 146 . = ALIGN(PAGE_SIZE); 147 __init_end = .; 148 149 BSS_SECTION(0, 0, 8) 150#ifdef CONFIG_ARM_MPU 151 . = ALIGN(PMSAv8_MINALIGN); 152#endif 153 _end = .; 154 155 STABS_DEBUG 156 DWARF_DEBUG 157 ARM_DETAILS 158 159 ARM_ASSERTS 160} 161 162/* 163 * These must never be empty 164 * If you have to comment these two assert statements out, your 165 * binutils is too old (for other reasons as well) 166 */ 167ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support") 168#ifndef CONFIG_COMPILE_TEST 169ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined") 170#endif 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#if defined(CONFIG_ARM_MPU) && !defined(CONFIG_COMPILE_TEST) 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