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 29OUTPUT_FORMAT("elf64-s390", "elf64-s390", "elf64-s390") 30OUTPUT_ARCH(s390:64-bit) 31ENTRY(startup_continue) 32jiffies = jiffies_64; 33 34PHDRS { 35 text PT_LOAD FLAGS(5); /* R_E */ 36 data PT_LOAD FLAGS(7); /* RWE */ 37 note PT_NOTE FLAGS(0); /* ___ */ 38} 39 40SECTIONS 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 *(.gnu.warning) 56 . = ALIGN(PAGE_SIZE); 57 _etext = .; /* End of text section */ 58 } :text = 0x0700 59 60 RO_DATA(PAGE_SIZE) 61 62 . = ALIGN(PAGE_SIZE); 63 _sdata = .; /* Start of data section */ 64 65 . = ALIGN(PAGE_SIZE); 66 __start_ro_after_init = .; 67 .data..ro_after_init : { 68 *(.data..ro_after_init) 69 JUMP_TABLE_DATA 70 } :data 71 . = ALIGN(PAGE_SIZE); 72 __end_ro_after_init = .; 73 74 . = ALIGN(8); 75 .skey_region_table : { 76 __skey_region_start = .; 77 KEEP(*(.skey_region)) 78 __skey_region_end = .; 79 } 80 81 .data.rel.ro : { 82 *(.data.rel.ro .data.rel.ro.*) 83 } 84 .got : { 85 __got_start = .; 86 *(.got) 87 __got_end = .; 88 } 89 90 RW_DATA(0x100, PAGE_SIZE, THREAD_SIZE) 91 .data.rel : { 92 *(.data.rel*) 93 } 94 BOOT_DATA_PRESERVED 95 96 . = ALIGN(8); 97 .amode31.refs : { 98 _start_amode31_refs = .; 99 *(.amode31.refs) 100 _end_amode31_refs = .; 101 } 102 103 . = ALIGN(PAGE_SIZE); 104 _edata = .; /* End of data section */ 105 106 /* will be freed after init */ 107 . = ALIGN(PAGE_SIZE); /* Init code and data */ 108 __init_begin = .; 109 110 . = ALIGN(PAGE_SIZE); 111 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { 112 _sinittext = .; 113 INIT_TEXT 114 . = ALIGN(PAGE_SIZE); 115 _einittext = .; 116 } 117 118 /* 119 * .exit.text is discarded at runtime, not link time, 120 * to deal with references from __bug_table 121 */ 122 .exit.text : { 123 EXIT_TEXT 124 } 125 126 .exit.data : { 127 EXIT_DATA 128 } 129 130 /* 131 * struct alt_inst entries. From the header (alternative.h): 132 * "Alternative instructions for different CPU types or capabilities" 133 * Think locking instructions on spinlocks. 134 * Note, that it is a part of __init region. 135 */ 136 . = ALIGN(8); 137 .altinstructions : { 138 __alt_instructions = .; 139 *(.altinstructions) 140 __alt_instructions_end = .; 141 } 142 143 /* 144 * And here are the replacement instructions. The linker sticks 145 * them as binary blobs. The .altinstructions has enough data to 146 * get the address and the length of them to patch the kernel safely. 147 * Note, that it is a part of __init region. 148 */ 149 .altinstr_replacement : { 150 *(.altinstr_replacement) 151 } 152 153 /* 154 * Table with the patch locations to undo expolines 155 */ 156 . = ALIGN(4); 157 .nospec_call_table : { 158 __nospec_call_start = . ; 159 *(.s390_indirect*) 160 __nospec_call_end = . ; 161 } 162 .nospec_return_table : { 163 __nospec_return_start = . ; 164 *(.s390_return*) 165 __nospec_return_end = . ; 166 } 167 168 BOOT_DATA 169 170 /* 171 * .amode31 section for code, data, ex_table that need to stay 172 * below 2 GB, even when the kernel is relocated above 2 GB. 173 */ 174 . = ALIGN(PAGE_SIZE); 175 _samode31 = .; 176 .amode31.text : { 177 _stext_amode31 = .; 178 *(.amode31.text) 179 *(.amode31.text.*_indirect_*) 180 . = ALIGN(PAGE_SIZE); 181 _etext_amode31 = .; 182 } 183 . = ALIGN(16); 184 .amode31.ex_table : { 185 _start_amode31_ex_table = .; 186 KEEP(*(.amode31.ex_table)) 187 _stop_amode31_ex_table = .; 188 } 189 . = ALIGN(PAGE_SIZE); 190 .amode31.data : { 191 *(.amode31.data) 192 } 193 . = _samode31 + AMODE31_SIZE; 194 _eamode31 = .; 195 196 /* early.c uses stsi, which requires page aligned data. */ 197 . = ALIGN(PAGE_SIZE); 198 INIT_DATA_SECTION(0x100) 199 200 RUNTIME_CONST_VARIABLES 201 202 PERCPU_SECTION(0x100) 203 204 . = ALIGN(PAGE_SIZE); 205 __init_end = .; /* freed after init ends here */ 206 207 BSS_SECTION(PAGE_SIZE, 4 * PAGE_SIZE, PAGE_SIZE) 208 209 . = ALIGN(PAGE_SIZE); 210 _end = . ; 211 212 /* 213 * uncompressed image info used by the decompressor 214 * it should match struct vmlinux_info 215 */ 216 .vmlinux.info 0 (INFO) : { 217 QUAD(startup_continue) /* entry */ 218 QUAD(__bss_start - _stext) /* image_size */ 219 QUAD(__bss_stop - __bss_start) /* bss_size */ 220 QUAD(__boot_data_start) /* bootdata_off */ 221 QUAD(__boot_data_end - __boot_data_start) /* bootdata_size */ 222 QUAD(__boot_data_preserved_start) /* bootdata_preserved_off */ 223 QUAD(__boot_data_preserved_end - 224 __boot_data_preserved_start) /* bootdata_preserved_size */ 225 QUAD(__got_start) /* got_start */ 226 QUAD(__got_end) /* got_end */ 227 QUAD(_eamode31 - _samode31) /* amode31_size */ 228 QUAD(init_mm) 229 QUAD(swapper_pg_dir) 230 QUAD(invalid_pg_dir) 231 QUAD(__alt_instructions) 232 QUAD(__alt_instructions_end) 233#ifdef CONFIG_KASAN 234 QUAD(kasan_early_shadow_page) 235 QUAD(kasan_early_shadow_pte) 236 QUAD(kasan_early_shadow_pmd) 237 QUAD(kasan_early_shadow_pud) 238 QUAD(kasan_early_shadow_p4d) 239#endif 240 } :NONE 241 242 /* Debugging sections. */ 243 STABS_DEBUG 244 DWARF_DEBUG 245 ELF_DETAILS 246 247 /* 248 * Make sure that the .got.plt is either completely empty or it 249 * contains only the three reserved double words. 250 */ 251 .got.plt : { 252 *(.got.plt) 253 } 254 ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, "Unexpected GOT/PLT entries detected!") 255 256 /* 257 * Sections that should stay zero sized, which is safer to 258 * explicitly check instead of blindly discarding. 259 */ 260 .plt : { 261 *(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt) 262 } 263 ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!") 264 .rela.dyn : { 265 *(.rela.*) *(.rela_*) 266 } 267 ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!") 268 269 /* Sections to be discarded */ 270 DISCARDS 271 /DISCARD/ : { 272 *(.eh_frame) 273 *(.interp) 274 } 275} 276