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#include <asm-generic/vmlinux.lds.h> 7#include <asm/cache.h> 8#include <asm/thread_info.h> 9#include <asm/memory.h> 10#include <asm/page.h> 11#ifdef CONFIG_ARM_KERNMEM_PERMS 12#include <asm/pgtable.h> 13#endif 14 15#define PROC_INFO \ 16 . = ALIGN(4); \ 17 VMLINUX_SYMBOL(__proc_info_begin) = .; \ 18 *(.proc.info.init) \ 19 VMLINUX_SYMBOL(__proc_info_end) = .; 20 21#define IDMAP_TEXT \ 22 ALIGN_FUNCTION(); \ 23 VMLINUX_SYMBOL(__idmap_text_start) = .; \ 24 *(.idmap.text) \ 25 VMLINUX_SYMBOL(__idmap_text_end) = .; \ 26 . = ALIGN(32); \ 27 VMLINUX_SYMBOL(__hyp_idmap_text_start) = .; \ 28 *(.hyp.idmap.text) \ 29 VMLINUX_SYMBOL(__hyp_idmap_text_end) = .; 30 31#ifdef CONFIG_HOTPLUG_CPU 32#define ARM_CPU_DISCARD(x) 33#define ARM_CPU_KEEP(x) x 34#else 35#define ARM_CPU_DISCARD(x) x 36#define ARM_CPU_KEEP(x) 37#endif 38 39#if (defined(CONFIG_SMP_ON_UP) && !defined(CONFIG_DEBUG_SPINLOCK)) || \ 40 defined(CONFIG_GENERIC_BUG) 41#define ARM_EXIT_KEEP(x) x 42#define ARM_EXIT_DISCARD(x) 43#else 44#define ARM_EXIT_KEEP(x) 45#define ARM_EXIT_DISCARD(x) x 46#endif 47 48OUTPUT_ARCH(arm) 49ENTRY(stext) 50 51#ifndef __ARMEB__ 52jiffies = jiffies_64; 53#else 54jiffies = jiffies_64 + 4; 55#endif 56 57SECTIONS 58{ 59 /* 60 * XXX: The linker does not define how output sections are 61 * assigned to input sections when there are multiple statements 62 * matching the same input section name. There is no documented 63 * order of matching. 64 * 65 * unwind exit sections must be discarded before the rest of the 66 * unwind sections get included. 67 */ 68 /DISCARD/ : { 69 *(.ARM.exidx.exit.text) 70 *(.ARM.extab.exit.text) 71 ARM_CPU_DISCARD(*(.ARM.exidx.cpuexit.text)) 72 ARM_CPU_DISCARD(*(.ARM.extab.cpuexit.text)) 73 ARM_EXIT_DISCARD(EXIT_TEXT) 74 ARM_EXIT_DISCARD(EXIT_DATA) 75 EXIT_CALL 76#ifndef CONFIG_MMU 77 *(.fixup) 78 *(__ex_table) 79#endif 80#ifndef CONFIG_SMP_ON_UP 81 *(.alt.smp.init) 82#endif 83 *(.discard) 84 *(.discard.*) 85 } 86 87#ifdef CONFIG_XIP_KERNEL 88 . = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR); 89#else 90 . = PAGE_OFFSET + TEXT_OFFSET; 91#endif 92 .head.text : { 93 _text = .; 94 HEAD_TEXT 95 } 96 97#ifdef CONFIG_ARM_KERNMEM_PERMS 98 . = ALIGN(1<<SECTION_SHIFT); 99#endif 100 101 .text : { /* Real text segment */ 102 _stext = .; /* Text and read-only data */ 103 __exception_text_start = .; 104 *(.exception.text) 105 __exception_text_end = .; 106 IRQENTRY_TEXT 107 TEXT_TEXT 108 SCHED_TEXT 109 LOCK_TEXT 110 KPROBES_TEXT 111 IDMAP_TEXT 112#ifdef CONFIG_MMU 113 *(.fixup) 114#endif 115 *(.gnu.warning) 116 *(.glue_7) 117 *(.glue_7t) 118 . = ALIGN(4); 119 *(.got) /* Global offset table */ 120 ARM_CPU_KEEP(PROC_INFO) 121 } 122 123#ifdef CONFIG_DEBUG_RODATA 124 . = ALIGN(1<<SECTION_SHIFT); 125#endif 126 RO_DATA(PAGE_SIZE) 127 128 . = ALIGN(4); 129 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { 130 __start___ex_table = .; 131#ifdef CONFIG_MMU 132 *(__ex_table) 133#endif 134 __stop___ex_table = .; 135 } 136 137#ifdef CONFIG_ARM_UNWIND 138 /* 139 * Stack unwinding tables 140 */ 141 . = ALIGN(8); 142 .ARM.unwind_idx : { 143 __start_unwind_idx = .; 144 *(.ARM.exidx*) 145 __stop_unwind_idx = .; 146 } 147 .ARM.unwind_tab : { 148 __start_unwind_tab = .; 149 *(.ARM.extab*) 150 __stop_unwind_tab = .; 151 } 152#endif 153 154 NOTES 155 156 _etext = .; /* End of text and rodata section */ 157 158#ifndef CONFIG_XIP_KERNEL 159# ifdef CONFIG_ARM_KERNMEM_PERMS 160 . = ALIGN(1<<SECTION_SHIFT); 161# else 162 . = ALIGN(PAGE_SIZE); 163# endif 164 __init_begin = .; 165#endif 166 /* 167 * The vectors and stubs are relocatable code, and the 168 * only thing that matters is their relative offsets 169 */ 170 __vectors_start = .; 171 .vectors 0 : AT(__vectors_start) { 172 *(.vectors) 173 } 174 . = __vectors_start + SIZEOF(.vectors); 175 __vectors_end = .; 176 177 __stubs_start = .; 178 .stubs 0x1000 : AT(__stubs_start) { 179 *(.stubs) 180 } 181 . = __stubs_start + SIZEOF(.stubs); 182 __stubs_end = .; 183 184 INIT_TEXT_SECTION(8) 185 .exit.text : { 186 ARM_EXIT_KEEP(EXIT_TEXT) 187 } 188 .init.proc.info : { 189 ARM_CPU_DISCARD(PROC_INFO) 190 } 191 .init.arch.info : { 192 __arch_info_begin = .; 193 *(.arch.info.init) 194 __arch_info_end = .; 195 } 196 .init.tagtable : { 197 __tagtable_begin = .; 198 *(.taglist.init) 199 __tagtable_end = .; 200 } 201#ifdef CONFIG_SMP_ON_UP 202 .init.smpalt : { 203 __smpalt_begin = .; 204 *(.alt.smp.init) 205 __smpalt_end = .; 206 } 207#endif 208 .init.pv_table : { 209 __pv_table_begin = .; 210 *(.pv_table) 211 __pv_table_end = .; 212 } 213 .init.data : { 214#ifndef CONFIG_XIP_KERNEL 215 INIT_DATA 216#endif 217 INIT_SETUP(16) 218 INIT_CALLS 219 CON_INITCALL 220 SECURITY_INITCALL 221 INIT_RAM_FS 222 } 223#ifndef CONFIG_XIP_KERNEL 224 .exit.data : { 225 ARM_EXIT_KEEP(EXIT_DATA) 226 } 227#endif 228 229#ifdef CONFIG_SMP 230 PERCPU_SECTION(L1_CACHE_BYTES) 231#endif 232 233#ifdef CONFIG_XIP_KERNEL 234 __data_loc = ALIGN(4); /* location in binary */ 235 . = PAGE_OFFSET + TEXT_OFFSET; 236#else 237#ifdef CONFIG_ARM_KERNMEM_PERMS 238 . = ALIGN(1<<SECTION_SHIFT); 239#else 240 . = ALIGN(THREAD_SIZE); 241#endif 242 __init_end = .; 243 __data_loc = .; 244#endif 245 246 .data : AT(__data_loc) { 247 _data = .; /* address in memory */ 248 _sdata = .; 249 250 /* 251 * first, the init task union, aligned 252 * to an 8192 byte boundary. 253 */ 254 INIT_TASK_DATA(THREAD_SIZE) 255 256#ifdef CONFIG_XIP_KERNEL 257 . = ALIGN(PAGE_SIZE); 258 __init_begin = .; 259 INIT_DATA 260 ARM_EXIT_KEEP(EXIT_DATA) 261 . = ALIGN(PAGE_SIZE); 262 __init_end = .; 263#endif 264 265 NOSAVE_DATA 266 CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES) 267 READ_MOSTLY_DATA(L1_CACHE_BYTES) 268 269 /* 270 * and the usual data section 271 */ 272 DATA_DATA 273 CONSTRUCTORS 274 275 _edata = .; 276 } 277 _edata_loc = __data_loc + SIZEOF(.data); 278 279#ifdef CONFIG_HAVE_TCM 280 /* 281 * We align everything to a page boundary so we can 282 * free it after init has commenced and TCM contents have 283 * been copied to its destination. 284 */ 285 .tcm_start : { 286 . = ALIGN(PAGE_SIZE); 287 __tcm_start = .; 288 __itcm_start = .; 289 } 290 291 /* 292 * Link these to the ITCM RAM 293 * Put VMA to the TCM address and LMA to the common RAM 294 * and we'll upload the contents from RAM to TCM and free 295 * the used RAM after that. 296 */ 297 .text_itcm ITCM_OFFSET : AT(__itcm_start) 298 { 299 __sitcm_text = .; 300 *(.tcm.text) 301 *(.tcm.rodata) 302 . = ALIGN(4); 303 __eitcm_text = .; 304 } 305 306 /* 307 * Reset the dot pointer, this is needed to create the 308 * relative __dtcm_start below (to be used as extern in code). 309 */ 310 . = ADDR(.tcm_start) + SIZEOF(.tcm_start) + SIZEOF(.text_itcm); 311 312 .dtcm_start : { 313 __dtcm_start = .; 314 } 315 316 /* TODO: add remainder of ITCM as well, that can be used for data! */ 317 .data_dtcm DTCM_OFFSET : AT(__dtcm_start) 318 { 319 . = ALIGN(4); 320 __sdtcm_data = .; 321 *(.tcm.data) 322 . = ALIGN(4); 323 __edtcm_data = .; 324 } 325 326 /* Reset the dot pointer or the linker gets confused */ 327 . = ADDR(.dtcm_start) + SIZEOF(.data_dtcm); 328 329 /* End marker for freeing TCM copy in linked object */ 330 .tcm_end : AT(ADDR(.dtcm_start) + SIZEOF(.data_dtcm)){ 331 . = ALIGN(PAGE_SIZE); 332 __tcm_end = .; 333 } 334#endif 335 336 BSS_SECTION(0, 0, 0) 337 _end = .; 338 339 STABS_DEBUG 340} 341 342/* 343 * These must never be empty 344 * If you have to comment these two assert statements out, your 345 * binutils is too old (for other reasons as well) 346 */ 347ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support") 348ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined") 349/* 350 * The HYP init code can't be more than a page long. 351 * The above comment applies as well. 352 */ 353ASSERT(((__hyp_idmap_text_end - __hyp_idmap_text_start) <= PAGE_SIZE), "HYP init code too big") 354