1/* 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#include <asm-generic/vmlinux.lds.h> 8#include <asm/cache.h> 9#include <asm/kernel-pgtable.h> 10#include <asm/thread_info.h> 11#include <asm/memory.h> 12#include <asm/page.h> 13#include <asm/pgtable.h> 14 15#include "image.h" 16 17/* .exit.text needed in case of alternative patching */ 18#define ARM_EXIT_KEEP(x) x 19#define ARM_EXIT_DISCARD(x) 20 21OUTPUT_ARCH(aarch64) 22ENTRY(_text) 23 24jiffies = jiffies_64; 25 26#define HYPERVISOR_TEXT \ 27 /* \ 28 * Align to 4 KB so that \ 29 * a) the HYP vector table is at its minimum \ 30 * alignment of 2048 bytes \ 31 * b) the HYP init code will not cross a page \ 32 * boundary if its size does not exceed \ 33 * 4 KB (see related ASSERT() below) \ 34 */ \ 35 . = ALIGN(SZ_4K); \ 36 VMLINUX_SYMBOL(__hyp_idmap_text_start) = .; \ 37 *(.hyp.idmap.text) \ 38 VMLINUX_SYMBOL(__hyp_idmap_text_end) = .; \ 39 VMLINUX_SYMBOL(__hyp_text_start) = .; \ 40 *(.hyp.text) \ 41 VMLINUX_SYMBOL(__hyp_text_end) = .; 42 43#define IDMAP_TEXT \ 44 . = ALIGN(SZ_4K); \ 45 VMLINUX_SYMBOL(__idmap_text_start) = .; \ 46 *(.idmap.text) \ 47 VMLINUX_SYMBOL(__idmap_text_end) = .; 48 49#ifdef CONFIG_HIBERNATION 50#define HIBERNATE_TEXT \ 51 . = ALIGN(SZ_4K); \ 52 VMLINUX_SYMBOL(__hibernate_exit_text_start) = .;\ 53 *(.hibernate_exit.text) \ 54 VMLINUX_SYMBOL(__hibernate_exit_text_end) = .; 55#else 56#define HIBERNATE_TEXT 57#endif 58 59/* 60 * The size of the PE/COFF section that covers the kernel image, which 61 * runs from stext to _edata, must be a round multiple of the PE/COFF 62 * FileAlignment, which we set to its minimum value of 0x200. 'stext' 63 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned 64 * boundary should be sufficient. 65 */ 66PECOFF_FILE_ALIGNMENT = 0x200; 67 68#ifdef CONFIG_EFI 69#define PECOFF_EDATA_PADDING \ 70 .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); } 71#else 72#define PECOFF_EDATA_PADDING 73#endif 74 75SECTIONS 76{ 77 /* 78 * XXX: The linker does not define how output sections are 79 * assigned to input sections when there are multiple statements 80 * matching the same input section name. There is no documented 81 * order of matching. 82 */ 83 /DISCARD/ : { 84 ARM_EXIT_DISCARD(EXIT_TEXT) 85 ARM_EXIT_DISCARD(EXIT_DATA) 86 EXIT_CALL 87 *(.discard) 88 *(.discard.*) 89 *(.interp .dynamic) 90 *(.dynsym .dynstr .hash) 91 } 92 93 . = KIMAGE_VADDR + TEXT_OFFSET; 94 95 .head.text : { 96 _text = .; 97 HEAD_TEXT 98 } 99 .text : { /* Real text segment */ 100 _stext = .; /* Text and read-only data */ 101 __exception_text_start = .; 102 *(.exception.text) 103 __exception_text_end = .; 104 IRQENTRY_TEXT 105 SOFTIRQENTRY_TEXT 106 ENTRY_TEXT 107 TEXT_TEXT 108 SCHED_TEXT 109 CPUIDLE_TEXT 110 LOCK_TEXT 111 KPROBES_TEXT 112 HYPERVISOR_TEXT 113 IDMAP_TEXT 114 HIBERNATE_TEXT 115 *(.fixup) 116 *(.gnu.warning) 117 . = ALIGN(16); 118 *(.got) /* Global offset table */ 119 } 120 121 . = ALIGN(SEGMENT_ALIGN); 122 _etext = .; /* End of text section */ 123 124 RO_DATA(PAGE_SIZE) /* everything from this point to */ 125 EXCEPTION_TABLE(8) /* __init_begin will be marked RO NX */ 126 NOTES 127 128 . = ALIGN(SEGMENT_ALIGN); 129 __init_begin = .; 130 __inittext_begin = .; 131 132 INIT_TEXT_SECTION(8) 133 .exit.text : { 134 ARM_EXIT_KEEP(EXIT_TEXT) 135 } 136 137 . = ALIGN(4); 138 .altinstructions : { 139 __alt_instructions = .; 140 *(.altinstructions) 141 __alt_instructions_end = .; 142 } 143 .altinstr_replacement : { 144 *(.altinstr_replacement) 145 } 146 147 . = ALIGN(PAGE_SIZE); 148 __inittext_end = .; 149 __initdata_begin = .; 150 151 .init.data : { 152 INIT_DATA 153 INIT_SETUP(16) 154 INIT_CALLS 155 CON_INITCALL 156 SECURITY_INITCALL 157 INIT_RAM_FS 158 *(.init.rodata.* .init.bss) /* from the EFI stub */ 159 } 160 .exit.data : { 161 ARM_EXIT_KEEP(EXIT_DATA) 162 } 163 164 PERCPU_SECTION(L1_CACHE_BYTES) 165 166 .rela : ALIGN(8) { 167 *(.rela .rela*) 168 } 169 170 __rela_offset = ABSOLUTE(ADDR(.rela) - KIMAGE_VADDR); 171 __rela_size = SIZEOF(.rela); 172 173 . = ALIGN(SEGMENT_ALIGN); 174 __initdata_end = .; 175 __init_end = .; 176 177 _data = .; 178 _sdata = .; 179 RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE) 180 181 /* 182 * Data written with the MMU off but read with the MMU on requires 183 * cache lines to be invalidated, discarding up to a Cache Writeback 184 * Granule (CWG) of data from the cache. Keep the section that 185 * requires this type of maintenance to be in its own Cache Writeback 186 * Granule (CWG) area so the cache maintenance operations don't 187 * interfere with adjacent data. 188 */ 189 .mmuoff.data.write : ALIGN(SZ_2K) { 190 __mmuoff_data_start = .; 191 *(.mmuoff.data.write) 192 } 193 . = ALIGN(SZ_2K); 194 .mmuoff.data.read : { 195 *(.mmuoff.data.read) 196 __mmuoff_data_end = .; 197 } 198 199 PECOFF_EDATA_PADDING 200 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin); 201 _edata = .; 202 203 BSS_SECTION(0, 0, 0) 204 205 . = ALIGN(PAGE_SIZE); 206 idmap_pg_dir = .; 207 . += IDMAP_DIR_SIZE; 208 swapper_pg_dir = .; 209 . += SWAPPER_DIR_SIZE; 210 211#ifdef CONFIG_ARM64_SW_TTBR0_PAN 212 reserved_ttbr0 = .; 213 . += RESERVED_TTBR0_SIZE; 214#endif 215 216 __pecoff_data_size = ABSOLUTE(. - __initdata_begin); 217 _end = .; 218 219 STABS_DEBUG 220 221 HEAD_SYMBOLS 222} 223 224/* 225 * The HYP init code and ID map text can't be longer than a page each, 226 * and should not cross a page boundary. 227 */ 228ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 229 "HYP init code too big or misaligned") 230ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 231 "ID map text too big or misaligned") 232#ifdef CONFIG_HIBERNATION 233ASSERT(__hibernate_exit_text_end - (__hibernate_exit_text_start & ~(SZ_4K - 1)) 234 <= SZ_4K, "Hibernate exit text too big or misaligned") 235#endif 236 237/* 238 * If padding is applied before .head.text, virt<->phys conversions will fail. 239 */ 240ASSERT(_text == (KIMAGE_VADDR + TEXT_OFFSET), "HEAD is misaligned") 241