xref: /openbmc/linux/arch/s390/kernel/vmlinux.lds.S (revision ddc141e5) 
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
9/*
10 * Put .bss..swapper_pg_dir as the first thing in .bss. This will
11 * make sure it has 16k alignment.
12 */
13#define BSS_FIRST_SECTIONS *(.bss..swapper_pg_dir)
14
15/* Handle ro_after_init data on our own. */
16#define RO_AFTER_INIT_DATA
17
18#include <asm-generic/vmlinux.lds.h>
19
20OUTPUT_FORMAT("elf64-s390", "elf64-s390", "elf64-s390")
21OUTPUT_ARCH(s390:64-bit)
22ENTRY(startup)
23jiffies = jiffies_64;
24
25PHDRS {
26	text PT_LOAD FLAGS(5);	/* R_E */
27	data PT_LOAD FLAGS(7);	/* RWE */
28	note PT_NOTE FLAGS(0);	/* ___ */
29}
30
31SECTIONS
32{
33	. = 0x00000000;
34	.text : {
35		/* Text and read-only data */
36		HEAD_TEXT
37		/*
38		 * E.g. perf doesn't like symbols starting at address zero,
39		 * therefore skip the initial PSW and channel program located
40		 * at address zero and let _text start at 0x200.
41		 */
42	_text = 0x200;
43		TEXT_TEXT
44		SCHED_TEXT
45		CPUIDLE_TEXT
46		LOCK_TEXT
47		KPROBES_TEXT
48		IRQENTRY_TEXT
49		SOFTIRQENTRY_TEXT
50		*(.fixup)
51		*(.gnu.warning)
52	} :text = 0x0700
53
54	. = ALIGN(PAGE_SIZE);
55	_etext = .;		/* End of text section */
56
57	NOTES :text :note
58
59	.dummy : { *(.dummy) } :data
60
61	RO_DATA_SECTION(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	}
71	EXCEPTION_TABLE(16)
72	. = ALIGN(PAGE_SIZE);
73	__end_ro_after_init = .;
74
75	RW_DATA_SECTION(0x100, PAGE_SIZE, THREAD_SIZE)
76
77	_edata = .;		/* End of data section */
78
79	/* will be freed after init */
80	. = ALIGN(PAGE_SIZE);	/* Init code and data */
81	__init_begin = .;
82
83	. = ALIGN(PAGE_SIZE);
84	.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
85		VMLINUX_SYMBOL(_sinittext) = . ;
86		INIT_TEXT
87		. = ALIGN(PAGE_SIZE);
88		VMLINUX_SYMBOL(_einittext) = . ;
89	}
90
91	/*
92	 * .exit.text is discarded at runtime, not link time,
93	 * to deal with references from __bug_table
94	*/
95	.exit.text : {
96		EXIT_TEXT
97	}
98
99	.exit.data : {
100		EXIT_DATA
101	}
102
103	/*
104	 * struct alt_inst entries. From the header (alternative.h):
105	 * "Alternative instructions for different CPU types or capabilities"
106	 * Think locking instructions on spinlocks.
107	 * Note, that it is a part of __init region.
108	 */
109	. = ALIGN(8);
110	.altinstructions : {
111		__alt_instructions = .;
112		*(.altinstructions)
113		__alt_instructions_end = .;
114	}
115
116	/*
117	 * And here are the replacement instructions. The linker sticks
118	 * them as binary blobs. The .altinstructions has enough data to
119	 * get the address and the length of them to patch the kernel safely.
120	 * Note, that it is a part of __init region.
121	 */
122	.altinstr_replacement : {
123		*(.altinstr_replacement)
124	}
125
126	/*
127	 * Table with the patch locations to undo expolines
128	*/
129	.nospec_call_table : {
130		__nospec_call_start = . ;
131		*(.s390_indirect*)
132		__nospec_call_end = . ;
133	}
134	.nospec_return_table : {
135		__nospec_return_start = . ;
136		*(.s390_return*)
137		__nospec_return_end = . ;
138	}
139
140	/* early.c uses stsi, which requires page aligned data. */
141	. = ALIGN(PAGE_SIZE);
142	INIT_DATA_SECTION(0x100)
143
144	PERCPU_SECTION(0x100)
145	. = ALIGN(PAGE_SIZE);
146	__init_end = .;		/* freed after init ends here */
147
148	BSS_SECTION(PAGE_SIZE, 4 * PAGE_SIZE, PAGE_SIZE)
149
150	_end = . ;
151
152	/* Debugging sections.	*/
153	STABS_DEBUG
154	DWARF_DEBUG
155
156	/* Sections to be discarded */
157	DISCARDS
158	/DISCARD/ : {
159		*(.eh_frame)
160	}
161}
162