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/* 50 * The size of the PE/COFF section that covers the kernel image, which 51 * runs from stext to _edata, must be a round multiple of the PE/COFF 52 * FileAlignment, which we set to its minimum value of 0x200. 'stext' 53 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned 54 * boundary should be sufficient. 55 */ 56PECOFF_FILE_ALIGNMENT = 0x200; 57 58#ifdef CONFIG_EFI 59#define PECOFF_EDATA_PADDING \ 60 .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); } 61#else 62#define PECOFF_EDATA_PADDING 63#endif 64 65#if defined(CONFIG_DEBUG_ALIGN_RODATA) 66#define ALIGN_DEBUG_RO . = ALIGN(1<<SECTION_SHIFT); 67#define ALIGN_DEBUG_RO_MIN(min) ALIGN_DEBUG_RO 68#elif defined(CONFIG_DEBUG_RODATA) 69#define ALIGN_DEBUG_RO . = ALIGN(1<<PAGE_SHIFT); 70#define ALIGN_DEBUG_RO_MIN(min) ALIGN_DEBUG_RO 71#else 72#define ALIGN_DEBUG_RO 73#define ALIGN_DEBUG_RO_MIN(min) . = ALIGN(min); 74#endif 75 76SECTIONS 77{ 78 /* 79 * XXX: The linker does not define how output sections are 80 * assigned to input sections when there are multiple statements 81 * matching the same input section name. There is no documented 82 * order of matching. 83 */ 84 /DISCARD/ : { 85 ARM_EXIT_DISCARD(EXIT_TEXT) 86 ARM_EXIT_DISCARD(EXIT_DATA) 87 EXIT_CALL 88 *(.discard) 89 *(.discard.*) 90 *(.interp .dynamic) 91 } 92 93 . = KIMAGE_VADDR + TEXT_OFFSET; 94 95 .head.text : { 96 _text = .; 97 HEAD_TEXT 98 } 99 ALIGN_DEBUG_RO_MIN(PAGE_SIZE) 100 .text : { /* Real text segment */ 101 _stext = .; /* Text and read-only data */ 102 __exception_text_start = .; 103 *(.exception.text) 104 __exception_text_end = .; 105 IRQENTRY_TEXT 106 SOFTIRQENTRY_TEXT 107 TEXT_TEXT 108 SCHED_TEXT 109 LOCK_TEXT 110 HYPERVISOR_TEXT 111 IDMAP_TEXT 112 *(.fixup) 113 *(.gnu.warning) 114 . = ALIGN(16); 115 *(.got) /* Global offset table */ 116 } 117 118 ALIGN_DEBUG_RO_MIN(PAGE_SIZE) 119 RO_DATA(PAGE_SIZE) /* everything from this point to */ 120 EXCEPTION_TABLE(8) /* _etext will be marked RO NX */ 121 NOTES 122 123 ALIGN_DEBUG_RO_MIN(PAGE_SIZE) 124 _etext = .; /* End of text and rodata section */ 125 __init_begin = .; 126 127 INIT_TEXT_SECTION(8) 128 .exit.text : { 129 ARM_EXIT_KEEP(EXIT_TEXT) 130 } 131 132 .init.data : { 133 INIT_DATA 134 INIT_SETUP(16) 135 INIT_CALLS 136 CON_INITCALL 137 SECURITY_INITCALL 138 INIT_RAM_FS 139 *(.init.rodata.* .init.bss) /* from the EFI stub */ 140 } 141 .exit.data : { 142 ARM_EXIT_KEEP(EXIT_DATA) 143 } 144 145 PERCPU_SECTION(L1_CACHE_BYTES) 146 147 . = ALIGN(4); 148 .altinstructions : { 149 __alt_instructions = .; 150 *(.altinstructions) 151 __alt_instructions_end = .; 152 } 153 .altinstr_replacement : { 154 *(.altinstr_replacement) 155 } 156 .rela : ALIGN(8) { 157 __reloc_start = .; 158 *(.rela .rela*) 159 __reloc_end = .; 160 } 161 .dynsym : ALIGN(8) { 162 __dynsym_start = .; 163 *(.dynsym) 164 } 165 .dynstr : { 166 *(.dynstr) 167 } 168 .hash : { 169 *(.hash) 170 } 171 172 . = ALIGN(PAGE_SIZE); 173 __init_end = .; 174 175 _data = .; 176 _sdata = .; 177 RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE) 178 PECOFF_EDATA_PADDING 179 _edata = .; 180 181 BSS_SECTION(0, 0, 0) 182 183 . = ALIGN(PAGE_SIZE); 184 idmap_pg_dir = .; 185 . += IDMAP_DIR_SIZE; 186 swapper_pg_dir = .; 187 . += SWAPPER_DIR_SIZE; 188 189 _end = .; 190 191 STABS_DEBUG 192 193 HEAD_SYMBOLS 194} 195 196/* 197 * The HYP init code and ID map text can't be longer than a page each, 198 * and should not cross a page boundary. 199 */ 200ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 201 "HYP init code too big or misaligned") 202ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 203 "ID map text too big or misaligned") 204 205/* 206 * If padding is applied before .head.text, virt<->phys conversions will fail. 207 */ 208ASSERT(_text == (KIMAGE_VADDR + TEXT_OFFSET), "HEAD is misaligned") 209