1#ifdef CONFIG_PPC64 2#define PROVIDE32(x) PROVIDE(__unused__##x) 3#else 4#define PROVIDE32(x) PROVIDE(x) 5#endif 6#include <asm/page.h> 7#include <asm-generic/vmlinux.lds.h> 8#include <asm/cache.h> 9#include <asm/thread_info.h> 10 11ENTRY(_stext) 12 13PHDRS { 14 kernel PT_LOAD FLAGS(7); /* RWX */ 15 notes PT_NOTE FLAGS(0); 16 dummy PT_NOTE FLAGS(0); 17 18 /* binutils < 2.18 has a bug that makes it misbehave when taking an 19 ELF file with all segments at load address 0 as input. This 20 happens when running "strip" on vmlinux, because of the AT() magic 21 in this linker script. People using GCC >= 4.2 won't run into 22 this problem, because the "build-id" support will put some data 23 into the "notes" segment (at a non-zero load address). 24 25 To work around this, we force some data into both the "dummy" 26 segment and the kernel segment, so the dummy segment will get a 27 non-zero load address. It's not enough to always create the 28 "notes" segment, since if nothing gets assigned to it, its load 29 address will be zero. */ 30} 31 32#ifdef CONFIG_PPC64 33OUTPUT_ARCH(powerpc:common64) 34jiffies = jiffies_64; 35#else 36OUTPUT_ARCH(powerpc:common) 37jiffies = jiffies_64 + 4; 38#endif 39SECTIONS 40{ 41 . = KERNELBASE; 42 43/* 44 * Text, read only data and other permanent read-only sections 45 */ 46 47 _text = .; 48 _stext = .; 49 50 /* 51 * Head text. 52 * This needs to be in its own output section to avoid ld placing 53 * branch trampoline stubs randomly throughout the fixed sections, 54 * which it will do (even if the branch comes from another section) 55 * in order to optimize stub generation. 56 */ 57 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { 58#ifdef CONFIG_PPC64 59 KEEP(*(.head.text.first_256B)); 60#ifdef CONFIG_PPC_BOOK3E 61# define END_FIXED 0x100 62#else 63 KEEP(*(.head.text.real_vectors)); 64 *(.head.text.real_trampolines); 65 KEEP(*(.head.text.virt_vectors)); 66 *(.head.text.virt_trampolines); 67# if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) 68 KEEP(*(.head.data.fwnmi_page)); 69# define END_FIXED 0x8000 70# else 71# define END_FIXED 0x7000 72# endif 73#endif 74 ASSERT((. == END_FIXED), "vmlinux.lds.S: fixed section overflow error"); 75#else /* !CONFIG_PPC64 */ 76 HEAD_TEXT 77#endif 78 } :kernel 79 80 __head_end = .; 81 82 /* 83 * If the build dies here, it's likely code in head_64.S is referencing 84 * labels it can't reach, and the linker inserting stubs without the 85 * assembler's knowledge. To debug, remove the above assert and 86 * rebuild. Look for branch stubs in the fixed section region. 87 * 88 * Linker stub generation could be allowed in "trampoline" 89 * sections if absolutely necessary, but this would require 90 * some rework of the fixed sections. Before resorting to this, 91 * consider references that have sufficient addressing range, 92 * (e.g., hand coded trampolines) so the linker does not have 93 * to add stubs. 94 * 95 * Linker stubs at the top of the main text section are currently not 96 * detected, and will result in a crash at boot due to offsets being 97 * wrong. 98 */ 99#ifdef CONFIG_PPC64 100 /* 101 * BLOCK(0) overrides the default output section alignment because 102 * this needs to start right after .head.text in order for fixed 103 * section placement to work. 104 */ 105 .text BLOCK(0) : AT(ADDR(.text) - LOAD_OFFSET) { 106#else 107 .text : AT(ADDR(.text) - LOAD_OFFSET) { 108 ALIGN_FUNCTION(); 109#endif 110 /* careful! __ftr_alt_* sections need to be close to .text */ 111 *(.text .fixup __ftr_alt_* .ref.text) 112 SCHED_TEXT 113 CPUIDLE_TEXT 114 LOCK_TEXT 115 KPROBES_TEXT 116 IRQENTRY_TEXT 117 SOFTIRQENTRY_TEXT 118 MEM_KEEP(init.text) 119 MEM_KEEP(exit.text) 120 121#ifdef CONFIG_PPC32 122 *(.got1) 123 __got2_start = .; 124 *(.got2) 125 __got2_end = .; 126#endif /* CONFIG_PPC32 */ 127 128 } :kernel 129 130 . = ALIGN(PAGE_SIZE); 131 _etext = .; 132 PROVIDE32 (etext = .); 133 134 /* Read-only data */ 135 RODATA 136 137 EXCEPTION_TABLE(0) 138 139 NOTES :kernel :notes 140 141 /* The dummy segment contents for the bug workaround mentioned above 142 near PHDRS. */ 143 .dummy : AT(ADDR(.dummy) - LOAD_OFFSET) { 144 LONG(0) 145 LONG(0) 146 LONG(0) 147 } :kernel :dummy 148 149/* 150 * Init sections discarded at runtime 151 */ 152 . = ALIGN(PAGE_SIZE); 153 __init_begin = .; 154 INIT_TEXT_SECTION(PAGE_SIZE) :kernel 155 156 /* .exit.text is discarded at runtime, not link time, 157 * to deal with references from __bug_table 158 */ 159 .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) { 160 EXIT_TEXT 161 } 162 163 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { 164 INIT_DATA 165 __vtop_table_begin = .; 166 *(.vtop_fixup); 167 __vtop_table_end = .; 168 __ptov_table_begin = .; 169 *(.ptov_fixup); 170 __ptov_table_end = .; 171 } 172 173 .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) { 174 INIT_SETUP(16) 175 } 176 177 .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) { 178 INIT_CALLS 179 } 180 181 .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) { 182 CON_INITCALL 183 } 184 185 SECURITY_INIT 186 187 . = ALIGN(8); 188 __ftr_fixup : AT(ADDR(__ftr_fixup) - LOAD_OFFSET) { 189 __start___ftr_fixup = .; 190 *(__ftr_fixup) 191 __stop___ftr_fixup = .; 192 } 193 . = ALIGN(8); 194 __mmu_ftr_fixup : AT(ADDR(__mmu_ftr_fixup) - LOAD_OFFSET) { 195 __start___mmu_ftr_fixup = .; 196 *(__mmu_ftr_fixup) 197 __stop___mmu_ftr_fixup = .; 198 } 199 . = ALIGN(8); 200 __lwsync_fixup : AT(ADDR(__lwsync_fixup) - LOAD_OFFSET) { 201 __start___lwsync_fixup = .; 202 *(__lwsync_fixup) 203 __stop___lwsync_fixup = .; 204 } 205#ifdef CONFIG_PPC64 206 . = ALIGN(8); 207 __fw_ftr_fixup : AT(ADDR(__fw_ftr_fixup) - LOAD_OFFSET) { 208 __start___fw_ftr_fixup = .; 209 *(__fw_ftr_fixup) 210 __stop___fw_ftr_fixup = .; 211 } 212#endif 213 .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) { 214 INIT_RAM_FS 215 } 216 217 PERCPU_SECTION(L1_CACHE_BYTES) 218 219 . = ALIGN(8); 220 .machine.desc : AT(ADDR(.machine.desc) - LOAD_OFFSET) { 221 __machine_desc_start = . ; 222 *(.machine.desc) 223 __machine_desc_end = . ; 224 } 225#ifdef CONFIG_RELOCATABLE 226 . = ALIGN(8); 227 .dynsym : AT(ADDR(.dynsym) - LOAD_OFFSET) 228 { 229#ifdef CONFIG_PPC32 230 __dynamic_symtab = .; 231#endif 232 *(.dynsym) 233 } 234 .dynstr : AT(ADDR(.dynstr) - LOAD_OFFSET) { *(.dynstr) } 235 .dynamic : AT(ADDR(.dynamic) - LOAD_OFFSET) 236 { 237 __dynamic_start = .; 238 *(.dynamic) 239 } 240 .hash : AT(ADDR(.hash) - LOAD_OFFSET) { *(.hash) } 241 .interp : AT(ADDR(.interp) - LOAD_OFFSET) { *(.interp) } 242 .rela.dyn : AT(ADDR(.rela.dyn) - LOAD_OFFSET) 243 { 244 __rela_dyn_start = .; 245 *(.rela*) 246 } 247#endif 248 /* .exit.data is discarded at runtime, not link time, 249 * to deal with references from .exit.text 250 */ 251 .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) { 252 EXIT_DATA 253 } 254 255 /* freed after init ends here */ 256 . = ALIGN(PAGE_SIZE); 257 __init_end = .; 258 259/* 260 * And now the various read/write data 261 */ 262 263 . = ALIGN(PAGE_SIZE); 264 _sdata = .; 265 266#ifdef CONFIG_PPC32 267 .data : AT(ADDR(.data) - LOAD_OFFSET) { 268 DATA_DATA 269 *(.sdata) 270 *(.got.plt) *(.got) 271 } 272#else 273 .data : AT(ADDR(.data) - LOAD_OFFSET) { 274 DATA_DATA 275 *(.data.rel*) 276 *(.toc1) 277 *(.branch_lt) 278 } 279 280 .opd : AT(ADDR(.opd) - LOAD_OFFSET) { 281 *(.opd) 282 } 283 284 . = ALIGN(256); 285 .got : AT(ADDR(.got) - LOAD_OFFSET) { 286 __toc_start = .; 287#ifndef CONFIG_RELOCATABLE 288 __prom_init_toc_start = .; 289 arch/powerpc/kernel/prom_init.o*(.toc .got) 290 __prom_init_toc_end = .; 291#endif 292 *(.got) 293 *(.toc) 294 } 295#endif 296 297 /* The initial task and kernel stack */ 298 INIT_TASK_DATA_SECTION(THREAD_SIZE) 299 300 .data..page_aligned : AT(ADDR(.data..page_aligned) - LOAD_OFFSET) { 301 PAGE_ALIGNED_DATA(PAGE_SIZE) 302 } 303 304 .data..cacheline_aligned : AT(ADDR(.data..cacheline_aligned) - LOAD_OFFSET) { 305 CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES) 306 } 307 308 .data..read_mostly : AT(ADDR(.data..read_mostly) - LOAD_OFFSET) { 309 READ_MOSTLY_DATA(L1_CACHE_BYTES) 310 } 311 312 . = ALIGN(PAGE_SIZE); 313 .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) { 314 NOSAVE_DATA 315 } 316 317 BUG_TABLE 318 319 . = ALIGN(PAGE_SIZE); 320 _edata = .; 321 PROVIDE32 (edata = .); 322 323/* 324 * And finally the bss 325 */ 326 327 BSS_SECTION(0, 0, 0) 328 329 . = ALIGN(PAGE_SIZE); 330 _end = . ; 331 PROVIDE32 (end = .); 332 333 /* Sections to be discarded. */ 334 DISCARDS 335} 336