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		*(.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