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 75#if defined(CONFIG_DEBUG_ALIGN_RODATA) 76/* 77 * 4 KB granule: 1 level 2 entry 78 * 16 KB granule: 128 level 3 entries, with contiguous bit 79 * 64 KB granule: 32 level 3 entries, with contiguous bit 80 */ 81#define SEGMENT_ALIGN SZ_2M 82#else 83/* 84 * 4 KB granule: 16 level 3 entries, with contiguous bit 85 * 16 KB granule: 4 level 3 entries, without contiguous bit 86 * 64 KB granule: 1 level 3 entry 87 */ 88#define SEGMENT_ALIGN SZ_64K 89#endif 90 91SECTIONS 92{ 93 /* 94 * XXX: The linker does not define how output sections are 95 * assigned to input sections when there are multiple statements 96 * matching the same input section name. There is no documented 97 * order of matching. 98 */ 99 /DISCARD/ : { 100 ARM_EXIT_DISCARD(EXIT_TEXT) 101 ARM_EXIT_DISCARD(EXIT_DATA) 102 EXIT_CALL 103 *(.discard) 104 *(.discard.*) 105 *(.interp .dynamic) 106 *(.dynsym .dynstr .hash) 107 } 108 109 . = KIMAGE_VADDR + TEXT_OFFSET; 110 111 .head.text : { 112 _text = .; 113 HEAD_TEXT 114 } 115 .text : { /* Real text segment */ 116 _stext = .; /* Text and read-only data */ 117 __exception_text_start = .; 118 *(.exception.text) 119 __exception_text_end = .; 120 IRQENTRY_TEXT 121 SOFTIRQENTRY_TEXT 122 ENTRY_TEXT 123 TEXT_TEXT 124 SCHED_TEXT 125 LOCK_TEXT 126 KPROBES_TEXT 127 HYPERVISOR_TEXT 128 IDMAP_TEXT 129 HIBERNATE_TEXT 130 *(.fixup) 131 *(.gnu.warning) 132 . = ALIGN(16); 133 *(.got) /* Global offset table */ 134 } 135 136 . = ALIGN(SEGMENT_ALIGN); 137 _etext = .; /* End of text section */ 138 139 RO_DATA(PAGE_SIZE) /* everything from this point to */ 140 EXCEPTION_TABLE(8) /* __init_begin will be marked RO NX */ 141 NOTES 142 143 . = ALIGN(SEGMENT_ALIGN); 144 __init_begin = .; 145 146 INIT_TEXT_SECTION(8) 147 .exit.text : { 148 ARM_EXIT_KEEP(EXIT_TEXT) 149 } 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 . = ALIGN(4); 167 .altinstructions : { 168 __alt_instructions = .; 169 *(.altinstructions) 170 __alt_instructions_end = .; 171 } 172 .altinstr_replacement : { 173 *(.altinstr_replacement) 174 } 175 .rela : ALIGN(8) { 176 *(.rela .rela*) 177 } 178 179 __rela_offset = ABSOLUTE(ADDR(.rela) - KIMAGE_VADDR); 180 __rela_size = SIZEOF(.rela); 181 182 . = ALIGN(SEGMENT_ALIGN); 183 __init_end = .; 184 185 _data = .; 186 _sdata = .; 187 RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE) 188 PECOFF_EDATA_PADDING 189 _edata = .; 190 191 BSS_SECTION(0, 0, 0) 192 193 . = ALIGN(PAGE_SIZE); 194 idmap_pg_dir = .; 195 . += IDMAP_DIR_SIZE; 196 swapper_pg_dir = .; 197 . += SWAPPER_DIR_SIZE; 198 199 _end = .; 200 201 STABS_DEBUG 202 203 HEAD_SYMBOLS 204} 205 206/* 207 * The HYP init code and ID map text can't be longer than a page each, 208 * and should not cross a page boundary. 209 */ 210ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 211 "HYP init code too big or misaligned") 212ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 213 "ID map text too big or misaligned") 214#ifdef CONFIG_HIBERNATION 215ASSERT(__hibernate_exit_text_end - (__hibernate_exit_text_start & ~(SZ_4K - 1)) 216 <= SZ_4K, "Hibernate exit text too big or misaligned") 217#endif 218 219/* 220 * If padding is applied before .head.text, virt<->phys conversions will fail. 221 */ 222ASSERT(_text == (KIMAGE_VADDR + TEXT_OFFSET), "HEAD is misaligned") 223