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#ifdef CONFIG_STACKPROTECTOR
154 . = ALIGN(8);
155 .stack_prot_table : {
156 __stack_prot_start = .;
157 KEEP(*(__stack_protector_loc))
158 __stack_prot_end = .;
159 }
160#endif
161
162 /*
163 * Table with the patch locations to undo expolines
164 */
165 . = ALIGN(4);
166 .nospec_call_table : {
167 __nospec_call_start = . ;
168 *(.s390_indirect*)
169 __nospec_call_end = . ;
170 }
171 .nospec_return_table : {
172 __nospec_return_start = . ;
173 *(.s390_return*)
174 __nospec_return_end = . ;
175 }
176
177 BOOT_DATA
178
179 /*
180 * .amode31 section for code, data, ex_table that need to stay
181 * below 2 GB, even when the kernel is relocated above 2 GB.
182 */
183 . = ALIGN(PAGE_SIZE);
184 _samode31 = .;
185 .amode31.text : {
186 _stext_amode31 = .;
187 *(.amode31.text)
188 *(.amode31.text.*_indirect_*)
189 . = ALIGN(PAGE_SIZE);
190 _etext_amode31 = .;
191 }
192 . = ALIGN(16);
193 .amode31.ex_table : {
194 _start_amode31_ex_table = .;
195 KEEP(*(.amode31.ex_table))
196 _stop_amode31_ex_table = .;
197 }
198 . = ALIGN(PAGE_SIZE);
199 .amode31.data : {
200 *(.amode31.data)
201 }
202 . = _samode31 + AMODE31_SIZE;
203 _eamode31 = .;
204
205 /* early.c uses stsi, which requires page aligned data. */
206 . = ALIGN(PAGE_SIZE);
207 INIT_DATA_SECTION(0x100)
208
209 RUNTIME_CONST_VARIABLES
210
211 PERCPU_SECTION(0x100)
212
213 . = ALIGN(PAGE_SIZE);
214 __init_end = .; /* freed after init ends here */
215
216 BSS_SECTION(PAGE_SIZE, 4 * PAGE_SIZE, PAGE_SIZE)
217
218 . = ALIGN(PAGE_SIZE);
219 _end = . ;
220
221 /* Debugging sections. */
222 STABS_DEBUG
223 DWARF_DEBUG
224 ELF_DETAILS
225
226 /*
227 * Make sure that the .got.plt is either completely empty or it
228 * contains only the three reserved double words.
229 */
230 .got.plt : {
231 *(.got.plt)
232 }
233 ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, "Unexpected GOT/PLT entries detected!")
234
235 /*
236 * Sections that should stay zero sized, which is safer to
237 * explicitly check instead of blindly discarding.
238 */
239 .plt : {
240 *(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt)
241 }
242 ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!")
243 .rela.dyn : {
244 *(.rela.*) *(.rela_*)
245 }
246 ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!")
247
248 /*
249 * uncompressed image info used by the decompressor
250 * it should match struct vmlinux_info
251 */
252 .vmlinux.info 0 (INFO) : {
253 QUAD(startup_continue) /* entry */
254 QUAD(__bss_start - _stext) /* image_size */
255 QUAD(__bss_stop - __bss_start) /* bss_size */
256 QUAD(__boot_data_start) /* bootdata_off */
257 QUAD(__boot_data_end - __boot_data_start) /* bootdata_size */
258 QUAD(__boot_data_preserved_start) /* bootdata_preserved_off */
259 QUAD(__boot_data_preserved_end -
260 __boot_data_preserved_start) /* bootdata_preserved_size */
261 QUAD(__got_start) /* got_start */
262 QUAD(__got_end) /* got_end */
263 QUAD(_eamode31 - _samode31) /* amode31_size */
264 QUAD(init_mm)
265 QUAD(swapper_pg_dir)
266 QUAD(invalid_pg_dir)
267 QUAD(__alt_instructions)
268 QUAD(__alt_instructions_end)
269#ifdef CONFIG_STACKPROTECTOR
270 QUAD(__stack_prot_start)
271 QUAD(__stack_prot_end)
272#endif
273#ifdef CONFIG_KASAN
274 QUAD(kasan_early_shadow_page)
275 QUAD(kasan_early_shadow_pte)
276 QUAD(kasan_early_shadow_pmd)
277 QUAD(kasan_early_shadow_pud)
278 QUAD(kasan_early_shadow_p4d)
279#endif
280 } :NONE
281
282 /* Sections to be discarded */
283 DISCARDS
284 /DISCARD/ : {
285 *(.eh_frame)
286 *(.interp)
287 }
288}
289

source code of linux/arch/s390/kernel/vmlinux.lds.S