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/thread_info.h> 9#include <asm/memory.h> 10#include <asm/page.h> 11#include <asm/pgtable.h> 12 13#include "image.h" 14 15/* .exit.text needed in case of alternative patching */ 16#define ARM_EXIT_KEEP(x) x 17#define ARM_EXIT_DISCARD(x) 18 19OUTPUT_ARCH(aarch64) 20ENTRY(_text) 21 22jiffies = jiffies_64; 23 24#define HYPERVISOR_TEXT \ 25 /* \ 26 * Align to 4 KB so that \ 27 * a) the HYP vector table is at its minimum \ 28 * alignment of 2048 bytes \ 29 * b) the HYP init code will not cross a page \ 30 * boundary if its size does not exceed \ 31 * 4 KB (see related ASSERT() below) \ 32 */ \ 33 . = ALIGN(SZ_4K); \ 34 VMLINUX_SYMBOL(__hyp_idmap_text_start) = .; \ 35 *(.hyp.idmap.text) \ 36 VMLINUX_SYMBOL(__hyp_idmap_text_end) = .; \ 37 VMLINUX_SYMBOL(__hyp_text_start) = .; \ 38 *(.hyp.text) \ 39 VMLINUX_SYMBOL(__hyp_text_end) = .; 40 41#define IDMAP_TEXT \ 42 . = ALIGN(SZ_4K); \ 43 VMLINUX_SYMBOL(__idmap_text_start) = .; \ 44 *(.idmap.text) \ 45 VMLINUX_SYMBOL(__idmap_text_end) = .; 46 47/* 48 * The size of the PE/COFF section that covers the kernel image, which 49 * runs from stext to _edata, must be a round multiple of the PE/COFF 50 * FileAlignment, which we set to its minimum value of 0x200. 'stext' 51 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned 52 * boundary should be sufficient. 53 */ 54PECOFF_FILE_ALIGNMENT = 0x200; 55 56#ifdef CONFIG_EFI 57#define PECOFF_EDATA_PADDING \ 58 .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); } 59#else 60#define PECOFF_EDATA_PADDING 61#endif 62 63#ifdef CONFIG_DEBUG_ALIGN_RODATA 64#define ALIGN_DEBUG_RO . = ALIGN(1<<SECTION_SHIFT); 65#define ALIGN_DEBUG_RO_MIN(min) ALIGN_DEBUG_RO 66#else 67#define ALIGN_DEBUG_RO 68#define ALIGN_DEBUG_RO_MIN(min) . = ALIGN(min); 69#endif 70 71SECTIONS 72{ 73 /* 74 * XXX: The linker does not define how output sections are 75 * assigned to input sections when there are multiple statements 76 * matching the same input section name. There is no documented 77 * order of matching. 78 */ 79 /DISCARD/ : { 80 ARM_EXIT_DISCARD(EXIT_TEXT) 81 ARM_EXIT_DISCARD(EXIT_DATA) 82 EXIT_CALL 83 *(.discard) 84 *(.discard.*) 85 } 86 87 . = PAGE_OFFSET + TEXT_OFFSET; 88 89 .head.text : { 90 _text = .; 91 HEAD_TEXT 92 } 93 ALIGN_DEBUG_RO 94 .text : { /* Real text segment */ 95 _stext = .; /* Text and read-only data */ 96 __exception_text_start = .; 97 *(.exception.text) 98 __exception_text_end = .; 99 IRQENTRY_TEXT 100 TEXT_TEXT 101 SCHED_TEXT 102 LOCK_TEXT 103 HYPERVISOR_TEXT 104 IDMAP_TEXT 105 *(.fixup) 106 *(.gnu.warning) 107 . = ALIGN(16); 108 *(.got) /* Global offset table */ 109 } 110 111 ALIGN_DEBUG_RO 112 RO_DATA(PAGE_SIZE) 113 EXCEPTION_TABLE(8) 114 NOTES 115 ALIGN_DEBUG_RO 116 _etext = .; /* End of text and rodata section */ 117 118 ALIGN_DEBUG_RO_MIN(PAGE_SIZE) 119 __init_begin = .; 120 121 INIT_TEXT_SECTION(8) 122 .exit.text : { 123 ARM_EXIT_KEEP(EXIT_TEXT) 124 } 125 126 ALIGN_DEBUG_RO_MIN(16) 127 .init.data : { 128 INIT_DATA 129 INIT_SETUP(16) 130 INIT_CALLS 131 CON_INITCALL 132 SECURITY_INITCALL 133 INIT_RAM_FS 134 } 135 .exit.data : { 136 ARM_EXIT_KEEP(EXIT_DATA) 137 } 138 139 PERCPU_SECTION(64) 140 141 . = ALIGN(PAGE_SIZE); 142 __init_end = .; 143 144 . = ALIGN(4); 145 .altinstructions : { 146 __alt_instructions = .; 147 *(.altinstructions) 148 __alt_instructions_end = .; 149 } 150 .altinstr_replacement : { 151 *(.altinstr_replacement) 152 } 153 154 . = ALIGN(PAGE_SIZE); 155 _data = .; 156 _sdata = .; 157 RW_DATA_SECTION(64, PAGE_SIZE, THREAD_SIZE) 158 PECOFF_EDATA_PADDING 159 _edata = .; 160 161 BSS_SECTION(0, 0, 0) 162 163 . = ALIGN(PAGE_SIZE); 164 idmap_pg_dir = .; 165 . += IDMAP_DIR_SIZE; 166 swapper_pg_dir = .; 167 . += SWAPPER_DIR_SIZE; 168 169 _end = .; 170 171 STABS_DEBUG 172 173 HEAD_SYMBOLS 174} 175 176/* 177 * The HYP init code and ID map text can't be longer than a page each, 178 * and should not cross a page boundary. 179 */ 180ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 181 "HYP init code too big or misaligned") 182ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 183 "ID map text too big or misaligned") 184 185/* 186 * If padding is applied before .head.text, virt<->phys conversions will fail. 187 */ 188ASSERT(_text == (PAGE_OFFSET + TEXT_OFFSET), "HEAD is misaligned") 189