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