xref: /linux/arch/s390/kernel/vmlinux.lds.S (revision 3113a29e25fe072d6eb0abccd695d7cc72ac9b6f) 
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#ifdef CONFIG_PIE_BUILD
196	.dynsym ALIGN(8) : {
197		__dynsym_start = .;
198		*(.dynsym)
199		__dynsym_end = .;
200	}
201	.rela.dyn ALIGN(8) : {
202		__rela_dyn_start = .;
203		*(.rela*)
204		__rela_dyn_end = .;
205	}
206	.dynamic ALIGN(8) : {
207		*(.dynamic)
208	}
209	.dynstr ALIGN(8) : {
210		*(.dynstr)
211	}
212#endif
213	.hash ALIGN(8) : {
214		*(.hash)
215	}
216	.gnu.hash ALIGN(8) : {
217		*(.gnu.hash)
218	}
219
220	. = ALIGN(PAGE_SIZE);
221	__init_end = .;		/* freed after init ends here */
222
223	BSS_SECTION(PAGE_SIZE, 4 * PAGE_SIZE, PAGE_SIZE)
224
225	. = ALIGN(PAGE_SIZE);
226	_end = . ;
227
228	/*
229	 * uncompressed image info used by the decompressor
230	 * it should match struct vmlinux_info
231	 */
232	.vmlinux.info 0 (INFO) : {
233		QUAD(startup_continue)				/* entry */
234		QUAD(__bss_start - _stext)			/* image_size */
235		QUAD(__bss_stop - __bss_start)			/* bss_size */
236		QUAD(__boot_data_start)				/* bootdata_off */
237		QUAD(__boot_data_end - __boot_data_start)	/* bootdata_size */
238		QUAD(__boot_data_preserved_start)		/* bootdata_preserved_off */
239		QUAD(__boot_data_preserved_end -
240		     __boot_data_preserved_start)		/* bootdata_preserved_size */
241#ifdef CONFIG_PIE_BUILD
242		QUAD(__dynsym_start)				/* dynsym_start */
243		QUAD(__rela_dyn_start)				/* rela_dyn_start */
244		QUAD(__rela_dyn_end)				/* rela_dyn_end */
245#else
246		QUAD(__got_start)				/* got_start */
247		QUAD(__got_end)					/* got_end */
248#endif
249		QUAD(_eamode31 - _samode31)			/* amode31_size */
250		QUAD(init_mm)
251		QUAD(swapper_pg_dir)
252		QUAD(invalid_pg_dir)
253#ifdef CONFIG_KASAN
254		QUAD(kasan_early_shadow_page)
255		QUAD(kasan_early_shadow_pte)
256		QUAD(kasan_early_shadow_pmd)
257		QUAD(kasan_early_shadow_pud)
258		QUAD(kasan_early_shadow_p4d)
259#endif
260	} :NONE
261
262	/* Debugging sections.	*/
263	STABS_DEBUG
264	DWARF_DEBUG
265	ELF_DETAILS
266
267	/*
268	 * Make sure that the .got.plt is either completely empty or it
269	 * contains only the three reserved double words.
270	 */
271	.got.plt : {
272		*(.got.plt)
273	}
274	ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, "Unexpected GOT/PLT entries detected!")
275
276	/*
277	 * Sections that should stay zero sized, which is safer to
278	 * explicitly check instead of blindly discarding.
279	 */
280	.plt : {
281		*(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt)
282	}
283	ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!")
284#ifndef CONFIG_PIE_BUILD
285	.rela.dyn : {
286		*(.rela.*) *(.rela_*)
287	}
288	ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!")
289#endif
290
291	/* Sections to be discarded */
292	DISCARDS
293	/DISCARD/ : {
294		*(.eh_frame)
295		*(.interp)
296	}
297}
298