1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* ld script to make s390 Linux kernel 3 * Written by Martin Schwidefsky (schwidefsky@de.ibm.com) 4 */ 5 6 #include <asm/thread_info.h> 7 #include <asm/page.h> 8 #include <asm/ftrace.lds.h> 9 10 /* 11 * Put .bss..swapper_pg_dir as the first thing in .bss. This will 12 * make sure it has 16k alignment. 13 */ 14 #define BSS_FIRST_SECTIONS *(.bss..swapper_pg_dir) \ 15 *(.bss..invalid_pg_dir) 16 17 #define RO_EXCEPTION_TABLE_ALIGN 16 18 19 /* Handle ro_after_init data on our own. */ 20 #define RO_AFTER_INIT_DATA 21 22 #define RUNTIME_DISCARD_EXIT 23 24 #define EMITS_PT_NOTE 25 26 #include <asm-generic/vmlinux.lds.h> 27 #include <asm/vmlinux.lds.h> 28 29 OUTPUT_FORMAT("elf64-s390", "elf64-s390", "elf64-s390") 30 OUTPUT_ARCH(s390:64-bit) 31 ENTRY(startup_continue) 32 jiffies = jiffies_64; 33 34 PHDRS { 35 text PT_LOAD FLAGS(5); /* R_E */ 36 data PT_LOAD FLAGS(7); /* RWE */ 37 note PT_NOTE FLAGS(0); /* ___ */ 38 } 39 40 SECTIONS 41 { 42 . = TEXT_OFFSET; 43 .text : { 44 _stext = .; /* Start of text section */ 45 _text = .; /* Text and read-only data */ 46 HEAD_TEXT 47 TEXT_TEXT 48 SCHED_TEXT 49 LOCK_TEXT 50 KPROBES_TEXT 51 IRQENTRY_TEXT 52 SOFTIRQENTRY_TEXT 53 FTRACE_HOTPATCH_TRAMPOLINES_TEXT 54 *(.text.*_indirect_*) 55 *(.fixup) 56 *(.gnu.warning) 57 . = ALIGN(PAGE_SIZE); 58 _etext = .; /* End of text section */ 59 } :text = 0x0700 60 61 RO_DATA(PAGE_SIZE) 62 63 . = ALIGN(PAGE_SIZE); 64 _sdata = .; /* Start of data section */ 65 66 . = ALIGN(PAGE_SIZE); 67 __start_ro_after_init = .; 68 .data..ro_after_init : { 69 *(.data..ro_after_init) 70 JUMP_TABLE_DATA 71 } :data 72 . = ALIGN(PAGE_SIZE); 73 __end_ro_after_init = .; 74 75 .data.rel.ro : { 76 *(.data.rel.ro .data.rel.ro.*) 77 } 78 .got : { 79 __got_start = .; 80 *(.got) 81 __got_end = .; 82 } 83 84 RW_DATA(0x100, PAGE_SIZE, THREAD_SIZE) 85 .data.rel : { 86 *(.data.rel*) 87 } 88 BOOT_DATA_PRESERVED 89 90 . = ALIGN(8); 91 .amode31.refs : { 92 _start_amode31_refs = .; 93 *(.amode31.refs) 94 _end_amode31_refs = .; 95 } 96 97 . = ALIGN(PAGE_SIZE); 98 _edata = .; /* End of data section */ 99 100 /* will be freed after init */ 101 . = ALIGN(PAGE_SIZE); /* Init code and data */ 102 __init_begin = .; 103 104 . = ALIGN(PAGE_SIZE); 105 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { 106 _sinittext = .; 107 INIT_TEXT 108 . = ALIGN(PAGE_SIZE); 109 _einittext = .; 110 } 111 112 /* 113 * .exit.text is discarded at runtime, not link time, 114 * to deal with references from __bug_table 115 */ 116 .exit.text : { 117 EXIT_TEXT 118 } 119 120 .exit.data : { 121 EXIT_DATA 122 } 123 124 /* 125 * struct alt_inst entries. From the header (alternative.h): 126 * "Alternative instructions for different CPU types or capabilities" 127 * Think locking instructions on spinlocks. 128 * Note, that it is a part of __init region. 129 */ 130 . = ALIGN(8); 131 .altinstructions : { 132 __alt_instructions = .; 133 *(.altinstructions) 134 __alt_instructions_end = .; 135 } 136 137 /* 138 * And here are the replacement instructions. The linker sticks 139 * them as binary blobs. The .altinstructions has enough data to 140 * get the address and the length of them to patch the kernel safely. 141 * Note, that it is a part of __init region. 142 */ 143 .altinstr_replacement : { 144 *(.altinstr_replacement) 145 } 146 147 /* 148 * Table with the patch locations to undo expolines 149 */ 150 . = ALIGN(4); 151 .nospec_call_table : { 152 __nospec_call_start = . ; 153 *(.s390_indirect*) 154 __nospec_call_end = . ; 155 } 156 .nospec_return_table : { 157 __nospec_return_start = . ; 158 *(.s390_return*) 159 __nospec_return_end = . ; 160 } 161 162 BOOT_DATA 163 164 /* 165 * .amode31 section for code, data, ex_table that need to stay 166 * below 2 GB, even when the kernel is relocated above 2 GB. 167 */ 168 . = ALIGN(PAGE_SIZE); 169 _samode31 = .; 170 .amode31.text : { 171 _stext_amode31 = .; 172 *(.amode31.text) 173 *(.amode31.text.*_indirect_*) 174 . = ALIGN(PAGE_SIZE); 175 _etext_amode31 = .; 176 } 177 . = ALIGN(16); 178 .amode31.ex_table : { 179 _start_amode31_ex_table = .; 180 KEEP(*(.amode31.ex_table)) 181 _stop_amode31_ex_table = .; 182 } 183 . = ALIGN(PAGE_SIZE); 184 .amode31.data : { 185 *(.amode31.data) 186 } 187 . = _samode31 + AMODE31_SIZE; 188 _eamode31 = .; 189 190 /* early.c uses stsi, which requires page aligned data. */ 191 . = ALIGN(PAGE_SIZE); 192 INIT_DATA_SECTION(0x100) 193 194 RUNTIME_CONST_VARIABLES 195 196 PERCPU_SECTION(0x100) 197 198 . = ALIGN(PAGE_SIZE); 199 __init_end = .; /* freed after init ends here */ 200 201 BSS_SECTION(PAGE_SIZE, 4 * PAGE_SIZE, PAGE_SIZE) 202 203 . = ALIGN(PAGE_SIZE); 204 _end = . ; 205 206 /* 207 * uncompressed image info used by the decompressor 208 * it should match struct vmlinux_info 209 */ 210 .vmlinux.info 0 (INFO) : { 211 QUAD(startup_continue) /* entry */ 212 QUAD(__bss_start - _stext) /* image_size */ 213 QUAD(__bss_stop - __bss_start) /* bss_size */ 214 QUAD(__boot_data_start) /* bootdata_off */ 215 QUAD(__boot_data_end - __boot_data_start) /* bootdata_size */ 216 QUAD(__boot_data_preserved_start) /* bootdata_preserved_off */ 217 QUAD(__boot_data_preserved_end - 218 __boot_data_preserved_start) /* bootdata_preserved_size */ 219 QUAD(__got_start) /* got_start */ 220 QUAD(__got_end) /* got_end */ 221 QUAD(_eamode31 - _samode31) /* amode31_size */ 222 QUAD(init_mm) 223 QUAD(swapper_pg_dir) 224 QUAD(invalid_pg_dir) 225 QUAD(__alt_instructions) 226 QUAD(__alt_instructions_end) 227 #ifdef CONFIG_KASAN 228 QUAD(kasan_early_shadow_page) 229 QUAD(kasan_early_shadow_pte) 230 QUAD(kasan_early_shadow_pmd) 231 QUAD(kasan_early_shadow_pud) 232 QUAD(kasan_early_shadow_p4d) 233 #endif 234 } :NONE 235 236 /* Debugging sections. */ 237 STABS_DEBUG 238 DWARF_DEBUG 239 ELF_DETAILS 240 241 /* 242 * Make sure that the .got.plt is either completely empty or it 243 * contains only the three reserved double words. 244 */ 245 .got.plt : { 246 *(.got.plt) 247 } 248 ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, "Unexpected GOT/PLT entries detected!") 249 250 /* 251 * Sections that should stay zero sized, which is safer to 252 * explicitly check instead of blindly discarding. 253 */ 254 .plt : { 255 *(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt) 256 } 257 ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!") 258 .rela.dyn : { 259 *(.rela.*) *(.rela_*) 260 } 261 ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!") 262 263 /* Sections to be discarded */ 264 DISCARDS 265 /DISCARD/ : { 266 *(.eh_frame) 267 *(.interp) 268 } 269 } 270