1/* ld script to make ARM Linux kernel 2 * taken from the i386 version by Russell King 3 * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz> 4 */ 5 6#ifdef CONFIG_XIP_KERNEL 7#include "vmlinux-xip.lds.S" 8#else 9 10#include <asm-generic/vmlinux.lds.h> 11#include <asm/cache.h> 12#include <asm/thread_info.h> 13#include <asm/memory.h> 14#include <asm/page.h> 15#include <asm/pgtable.h> 16 17#define PROC_INFO \ 18 . = ALIGN(4); \ 19 VMLINUX_SYMBOL(__proc_info_begin) = .; \ 20 *(.proc.info.init) \ 21 VMLINUX_SYMBOL(__proc_info_end) = .; 22 23#define HYPERVISOR_TEXT \ 24 VMLINUX_SYMBOL(__hyp_text_start) = .; \ 25 *(.hyp.text) \ 26 VMLINUX_SYMBOL(__hyp_text_end) = .; 27 28#define IDMAP_TEXT \ 29 ALIGN_FUNCTION(); \ 30 VMLINUX_SYMBOL(__idmap_text_start) = .; \ 31 *(.idmap.text) \ 32 VMLINUX_SYMBOL(__idmap_text_end) = .; \ 33 . = ALIGN(PAGE_SIZE); \ 34 VMLINUX_SYMBOL(__hyp_idmap_text_start) = .; \ 35 *(.hyp.idmap.text) \ 36 VMLINUX_SYMBOL(__hyp_idmap_text_end) = .; 37 38#ifdef CONFIG_HOTPLUG_CPU 39#define ARM_CPU_DISCARD(x) 40#define ARM_CPU_KEEP(x) x 41#else 42#define ARM_CPU_DISCARD(x) x 43#define ARM_CPU_KEEP(x) 44#endif 45 46#if (defined(CONFIG_SMP_ON_UP) && !defined(CONFIG_DEBUG_SPINLOCK)) || \ 47 defined(CONFIG_GENERIC_BUG) 48#define ARM_EXIT_KEEP(x) x 49#define ARM_EXIT_DISCARD(x) 50#else 51#define ARM_EXIT_KEEP(x) 52#define ARM_EXIT_DISCARD(x) x 53#endif 54 55OUTPUT_ARCH(arm) 56ENTRY(stext) 57 58#ifndef __ARMEB__ 59jiffies = jiffies_64; 60#else 61jiffies = jiffies_64 + 4; 62#endif 63 64SECTIONS 65{ 66 /* 67 * XXX: The linker does not define how output sections are 68 * assigned to input sections when there are multiple statements 69 * matching the same input section name. There is no documented 70 * order of matching. 71 * 72 * unwind exit sections must be discarded before the rest of the 73 * unwind sections get included. 74 */ 75 /DISCARD/ : { 76 *(.ARM.exidx.exit.text) 77 *(.ARM.extab.exit.text) 78 ARM_CPU_DISCARD(*(.ARM.exidx.cpuexit.text)) 79 ARM_CPU_DISCARD(*(.ARM.extab.cpuexit.text)) 80 ARM_EXIT_DISCARD(EXIT_TEXT) 81 ARM_EXIT_DISCARD(EXIT_DATA) 82 EXIT_CALL 83#ifndef CONFIG_MMU 84 *(.text.fixup) 85 *(__ex_table) 86#endif 87#ifndef CONFIG_SMP_ON_UP 88 *(.alt.smp.init) 89#endif 90 *(.discard) 91 *(.discard.*) 92 } 93 94 . = PAGE_OFFSET + TEXT_OFFSET; 95 .head.text : { 96 _text = .; 97 HEAD_TEXT 98 } 99 100#ifdef CONFIG_DEBUG_RODATA 101 . = ALIGN(1<<SECTION_SHIFT); 102#endif 103 104 .text : { /* Real text segment */ 105 _stext = .; /* Text and read-only data */ 106 IDMAP_TEXT 107 __exception_text_start = .; 108 *(.exception.text) 109 __exception_text_end = .; 110 IRQENTRY_TEXT 111 SOFTIRQENTRY_TEXT 112 TEXT_TEXT 113 SCHED_TEXT 114 LOCK_TEXT 115 HYPERVISOR_TEXT 116 KPROBES_TEXT 117 *(.gnu.warning) 118 *(.glue_7) 119 *(.glue_7t) 120 . = ALIGN(4); 121 *(.got) /* Global offset table */ 122 ARM_CPU_KEEP(PROC_INFO) 123 } 124 125#ifdef CONFIG_DEBUG_ALIGN_RODATA 126 . = ALIGN(1<<SECTION_SHIFT); 127#endif 128 RO_DATA(PAGE_SIZE) 129 130 . = ALIGN(4); 131 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { 132 __start___ex_table = .; 133#ifdef CONFIG_MMU 134 *(__ex_table) 135#endif 136 __stop___ex_table = .; 137 } 138 139#ifdef CONFIG_ARM_UNWIND 140 /* 141 * Stack unwinding tables 142 */ 143 . = ALIGN(8); 144 .ARM.unwind_idx : { 145 __start_unwind_idx = .; 146 *(.ARM.exidx*) 147 __stop_unwind_idx = .; 148 } 149 .ARM.unwind_tab : { 150 __start_unwind_tab = .; 151 *(.ARM.extab*) 152 __stop_unwind_tab = .; 153 } 154#endif 155 156 NOTES 157 158 _etext = .; /* End of text and rodata section */ 159 160#ifdef CONFIG_DEBUG_RODATA 161 . = ALIGN(1<<SECTION_SHIFT); 162#else 163 . = ALIGN(PAGE_SIZE); 164#endif 165 __init_begin = .; 166 167 /* 168 * The vectors and stubs are relocatable code, and the 169 * only thing that matters is their relative offsets 170 */ 171 __vectors_start = .; 172 .vectors 0xffff0000 : AT(__vectors_start) { 173 *(.vectors) 174 } 175 . = __vectors_start + SIZEOF(.vectors); 176 __vectors_end = .; 177 178 __stubs_start = .; 179 .stubs ADDR(.vectors) + 0x1000 : AT(__stubs_start) { 180 *(.stubs) 181 } 182 . = __stubs_start + SIZEOF(.stubs); 183 __stubs_end = .; 184 185 PROVIDE(vector_fiq_offset = vector_fiq - ADDR(.vectors)); 186 187 INIT_TEXT_SECTION(8) 188 .exit.text : { 189 ARM_EXIT_KEEP(EXIT_TEXT) 190 } 191 .init.proc.info : { 192 ARM_CPU_DISCARD(PROC_INFO) 193 } 194 .init.arch.info : { 195 __arch_info_begin = .; 196 *(.arch.info.init) 197 __arch_info_end = .; 198 } 199 .init.tagtable : { 200 __tagtable_begin = .; 201 *(.taglist.init) 202 __tagtable_end = .; 203 } 204#ifdef CONFIG_SMP_ON_UP 205 .init.smpalt : { 206 __smpalt_begin = .; 207 *(.alt.smp.init) 208 __smpalt_end = .; 209 } 210#endif 211 .init.pv_table : { 212 __pv_table_begin = .; 213 *(.pv_table) 214 __pv_table_end = .; 215 } 216 .init.data : { 217 INIT_DATA 218 INIT_SETUP(16) 219 INIT_CALLS 220 CON_INITCALL 221 SECURITY_INITCALL 222 INIT_RAM_FS 223 } 224 .exit.data : { 225 ARM_EXIT_KEEP(EXIT_DATA) 226 } 227 228#ifdef CONFIG_SMP 229 PERCPU_SECTION(L1_CACHE_BYTES) 230#endif 231 232#ifdef CONFIG_DEBUG_RODATA 233 . = ALIGN(1<<SECTION_SHIFT); 234#else 235 . = ALIGN(THREAD_SIZE); 236#endif 237 __init_end = .; 238 __data_loc = .; 239 240 .data : AT(__data_loc) { 241 _data = .; /* address in memory */ 242 _sdata = .; 243 244 /* 245 * first, the init task union, aligned 246 * to an 8192 byte boundary. 247 */ 248 INIT_TASK_DATA(THREAD_SIZE) 249 250 NOSAVE_DATA 251 CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES) 252 READ_MOSTLY_DATA(L1_CACHE_BYTES) 253 254 /* 255 * and the usual data section 256 */ 257 DATA_DATA 258 CONSTRUCTORS 259 260 _edata = .; 261 } 262 _edata_loc = __data_loc + SIZEOF(.data); 263 264#ifdef CONFIG_HAVE_TCM 265 /* 266 * We align everything to a page boundary so we can 267 * free it after init has commenced and TCM contents have 268 * been copied to its destination. 269 */ 270 .tcm_start : { 271 . = ALIGN(PAGE_SIZE); 272 __tcm_start = .; 273 __itcm_start = .; 274 } 275 276 /* 277 * Link these to the ITCM RAM 278 * Put VMA to the TCM address and LMA to the common RAM 279 * and we'll upload the contents from RAM to TCM and free 280 * the used RAM after that. 281 */ 282 .text_itcm ITCM_OFFSET : AT(__itcm_start) 283 { 284 __sitcm_text = .; 285 *(.tcm.text) 286 *(.tcm.rodata) 287 . = ALIGN(4); 288 __eitcm_text = .; 289 } 290 291 /* 292 * Reset the dot pointer, this is needed to create the 293 * relative __dtcm_start below (to be used as extern in code). 294 */ 295 . = ADDR(.tcm_start) + SIZEOF(.tcm_start) + SIZEOF(.text_itcm); 296 297 .dtcm_start : { 298 __dtcm_start = .; 299 } 300 301 /* TODO: add remainder of ITCM as well, that can be used for data! */ 302 .data_dtcm DTCM_OFFSET : AT(__dtcm_start) 303 { 304 . = ALIGN(4); 305 __sdtcm_data = .; 306 *(.tcm.data) 307 . = ALIGN(4); 308 __edtcm_data = .; 309 } 310 311 /* Reset the dot pointer or the linker gets confused */ 312 . = ADDR(.dtcm_start) + SIZEOF(.data_dtcm); 313 314 /* End marker for freeing TCM copy in linked object */ 315 .tcm_end : AT(ADDR(.dtcm_start) + SIZEOF(.data_dtcm)){ 316 . = ALIGN(PAGE_SIZE); 317 __tcm_end = .; 318 } 319#endif 320 321 BSS_SECTION(0, 0, 0) 322 _end = .; 323 324 STABS_DEBUG 325} 326 327#ifdef CONFIG_DEBUG_RODATA 328/* 329 * Without CONFIG_DEBUG_ALIGN_RODATA, __start_rodata_section_aligned will 330 * be the first section-aligned location after __start_rodata. Otherwise, 331 * it will be equal to __start_rodata. 332 */ 333__start_rodata_section_aligned = ALIGN(__start_rodata, 1 << SECTION_SHIFT); 334#endif 335 336/* 337 * These must never be empty 338 * If you have to comment these two assert statements out, your 339 * binutils is too old (for other reasons as well) 340 */ 341ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support") 342ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined") 343 344/* 345 * The HYP init code can't be more than a page long, 346 * and should not cross a page boundary. 347 * The above comment applies as well. 348 */ 349ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & PAGE_MASK) <= PAGE_SIZE, 350 "HYP init code too big or misaligned") 351 352#endif /* CONFIG_XIP_KERNEL */ 353