1/* ld script to make ARM Linux kernel 2 * taken from the i386 version by Russell King 3 * Written by Martin Mares <[email protected]> 4 */ 5 6#include <asm-generic/vmlinux.lds.h> 7#include <asm/thread_info.h> 8#include <asm/memory.h> 9#include <asm/page.h> 10 11#define PROC_INFO \ 12 VMLINUX_SYMBOL(__proc_info_begin) = .; \ 13 *(.proc.info.init) \ 14 VMLINUX_SYMBOL(__proc_info_end) = .; 15 16#ifdef CONFIG_HOTPLUG_CPU 17#define ARM_CPU_DISCARD(x) 18#define ARM_CPU_KEEP(x) x 19#else 20#define ARM_CPU_DISCARD(x) x 21#define ARM_CPU_KEEP(x) 22#endif 23 24#if defined(CONFIG_SMP_ON_UP) && !defined(CONFIG_DEBUG_SPINLOCK) 25#define ARM_EXIT_KEEP(x) x 26#define ARM_EXIT_DISCARD(x) 27#else 28#define ARM_EXIT_KEEP(x) 29#define ARM_EXIT_DISCARD(x) x 30#endif 31 32OUTPUT_ARCH(arm) 33ENTRY(stext) 34 35#ifndef __ARMEB__ 36jiffies = jiffies_64; 37#else 38jiffies = jiffies_64 + 4; 39#endif 40 41SECTIONS 42{ 43 /* 44 * XXX: The linker does not define how output sections are 45 * assigned to input sections when there are multiple statements 46 * matching the same input section name. There is no documented 47 * order of matching. 48 * 49 * unwind exit sections must be discarded before the rest of the 50 * unwind sections get included. 51 */ 52 /DISCARD/ : { 53 *(.ARM.exidx.exit.text) 54 *(.ARM.extab.exit.text) 55 ARM_CPU_DISCARD(*(.ARM.exidx.cpuexit.text)) 56 ARM_CPU_DISCARD(*(.ARM.extab.cpuexit.text)) 57 ARM_EXIT_DISCARD(EXIT_TEXT) 58 ARM_EXIT_DISCARD(EXIT_DATA) 59 EXIT_CALL 60#ifndef CONFIG_HOTPLUG 61 *(.ARM.exidx.devexit.text) 62 *(.ARM.extab.devexit.text) 63#endif 64#ifndef CONFIG_MMU 65 *(.fixup) 66 *(__ex_table) 67#endif 68#ifndef CONFIG_SMP_ON_UP 69 *(.alt.smp.init) 70#endif 71 *(.discard) 72 *(.discard.*) 73 } 74 75#ifdef CONFIG_XIP_KERNEL 76 . = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR); 77#else 78 . = PAGE_OFFSET + TEXT_OFFSET; 79#endif 80 .head.text : { 81 _text = .; 82 HEAD_TEXT 83 } 84 .text : { /* Real text segment */ 85 _stext = .; /* Text and read-only data */ 86 __exception_text_start = .; 87 *(.exception.text) 88 __exception_text_end = .; 89 IRQENTRY_TEXT 90 TEXT_TEXT 91 SCHED_TEXT 92 LOCK_TEXT 93 KPROBES_TEXT 94#ifdef CONFIG_MMU 95 *(.fixup) 96#endif 97 *(.gnu.warning) 98 *(.glue_7) 99 *(.glue_7t) 100 . = ALIGN(4); 101 *(.got) /* Global offset table */ 102 ARM_CPU_KEEP(PROC_INFO) 103 } 104 105 RO_DATA(PAGE_SIZE) 106 107#ifdef CONFIG_ARM_UNWIND 108 /* 109 * Stack unwinding tables 110 */ 111 . = ALIGN(8); 112 .ARM.unwind_idx : { 113 __start_unwind_idx = .; 114 *(.ARM.exidx*) 115 __stop_unwind_idx = .; 116 } 117 .ARM.unwind_tab : { 118 __start_unwind_tab = .; 119 *(.ARM.extab*) 120 __stop_unwind_tab = .; 121 } 122#endif 123 124 _etext = .; /* End of text and rodata section */ 125 126#ifndef CONFIG_XIP_KERNEL 127 . = ALIGN(PAGE_SIZE); 128 __init_begin = .; 129#endif 130 131 INIT_TEXT_SECTION(8) 132 .exit.text : { 133 ARM_EXIT_KEEP(EXIT_TEXT) 134 } 135 .init.proc.info : { 136 ARM_CPU_DISCARD(PROC_INFO) 137 } 138 .init.arch.info : { 139 __arch_info_begin = .; 140 *(.arch.info.init) 141 __arch_info_end = .; 142 } 143 .init.tagtable : { 144 __tagtable_begin = .; 145 *(.taglist.init) 146 __tagtable_end = .; 147 } 148#ifdef CONFIG_SMP_ON_UP 149 .init.smpalt : { 150 __smpalt_begin = .; 151 *(.alt.smp.init) 152 __smpalt_end = .; 153 } 154#endif 155 .init.pv_table : { 156 __pv_table_begin = .; 157 *(.pv_table) 158 __pv_table_end = .; 159 } 160 .init.data : { 161#ifndef CONFIG_XIP_KERNEL 162 INIT_DATA 163#endif 164 INIT_SETUP(16) 165 INIT_CALLS 166 CON_INITCALL 167 SECURITY_INITCALL 168 INIT_RAM_FS 169 } 170#ifndef CONFIG_XIP_KERNEL 171 .exit.data : { 172 ARM_EXIT_KEEP(EXIT_DATA) 173 } 174#endif 175 176 PERCPU_SECTION(32) 177 178#ifdef CONFIG_XIP_KERNEL 179 __data_loc = ALIGN(4); /* location in binary */ 180 . = PAGE_OFFSET + TEXT_OFFSET; 181#else 182 __init_end = .; 183 . = ALIGN(THREAD_SIZE); 184 __data_loc = .; 185#endif 186 187 .data : AT(__data_loc) { 188 _data = .; /* address in memory */ 189 _sdata = .; 190 191 /* 192 * first, the init task union, aligned 193 * to an 8192 byte boundary. 194 */ 195 INIT_TASK_DATA(THREAD_SIZE) 196 197#ifdef CONFIG_XIP_KERNEL 198 . = ALIGN(PAGE_SIZE); 199 __init_begin = .; 200 INIT_DATA 201 ARM_EXIT_KEEP(EXIT_DATA) 202 . = ALIGN(PAGE_SIZE); 203 __init_end = .; 204#endif 205 206 NOSAVE_DATA 207 CACHELINE_ALIGNED_DATA(32) 208 READ_MOSTLY_DATA(32) 209 210 /* 211 * The exception fixup table (might need resorting at runtime) 212 */ 213 . = ALIGN(32); 214 __start___ex_table = .; 215#ifdef CONFIG_MMU 216 *(__ex_table) 217#endif 218 __stop___ex_table = .; 219 220 /* 221 * and the usual data section 222 */ 223 DATA_DATA 224 CONSTRUCTORS 225 226 _edata = .; 227 } 228 _edata_loc = __data_loc + SIZEOF(.data); 229 230#ifdef CONFIG_HAVE_TCM 231 /* 232 * We align everything to a page boundary so we can 233 * free it after init has commenced and TCM contents have 234 * been copied to its destination. 235 */ 236 .tcm_start : { 237 . = ALIGN(PAGE_SIZE); 238 __tcm_start = .; 239 __itcm_start = .; 240 } 241 242 /* 243 * Link these to the ITCM RAM 244 * Put VMA to the TCM address and LMA to the common RAM 245 * and we'll upload the contents from RAM to TCM and free 246 * the used RAM after that. 247 */ 248 .text_itcm ITCM_OFFSET : AT(__itcm_start) 249 { 250 __sitcm_text = .; 251 *(.tcm.text) 252 *(.tcm.rodata) 253 . = ALIGN(4); 254 __eitcm_text = .; 255 } 256 257 /* 258 * Reset the dot pointer, this is needed to create the 259 * relative __dtcm_start below (to be used as extern in code). 260 */ 261 . = ADDR(.tcm_start) + SIZEOF(.tcm_start) + SIZEOF(.text_itcm); 262 263 .dtcm_start : { 264 __dtcm_start = .; 265 } 266 267 /* TODO: add remainder of ITCM as well, that can be used for data! */ 268 .data_dtcm DTCM_OFFSET : AT(__dtcm_start) 269 { 270 . = ALIGN(4); 271 __sdtcm_data = .; 272 *(.tcm.data) 273 . = ALIGN(4); 274 __edtcm_data = .; 275 } 276 277 /* Reset the dot pointer or the linker gets confused */ 278 . = ADDR(.dtcm_start) + SIZEOF(.data_dtcm); 279 280 /* End marker for freeing TCM copy in linked object */ 281 .tcm_end : AT(ADDR(.dtcm_start) + SIZEOF(.data_dtcm)){ 282 . = ALIGN(PAGE_SIZE); 283 __tcm_end = .; 284 } 285#endif 286 287 NOTES 288 289 BSS_SECTION(0, 0, 0) 290 _end = .; 291 292 STABS_DEBUG 293 .comment 0 : { *(.comment) } 294} 295 296/* 297 * These must never be empty 298 * If you have to comment these two assert statements out, your 299 * binutils is too old (for other reasons as well) 300 */ 301ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support") 302ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined") 303