1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* ld script to make s390 Linux kernel
3 * Written by Martin Schwidefsky (schwidefsky@de.ibm.com)
6 #include <asm/thread_info.h>
10 * Put .bss..swapper_pg_dir as the first thing in .bss. This will
11 * make sure it has 16k alignment.
13 #define BSS_FIRST_SECTIONS *(.bss..swapper_pg_dir)
15 /* Handle ro_after_init data on our own. */
16 #define RO_AFTER_INIT_DATA
18 #include <asm-generic/vmlinux.lds.h>
20 OUTPUT_FORMAT("elf64-s390", "elf64-s390", "elf64-s390")
21 OUTPUT_ARCH(s390:64-bit)
26 text PT_LOAD FLAGS(5); /* R_E */
27 data PT_LOAD FLAGS(7); /* RWE */
28 note PT_NOTE FLAGS(0); /* ___ */
35 /* Text and read-only data */
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.
55 _etext = .; /* End of text section */
59 .dummy : { *(.dummy) } :data
61 RO_DATA_SECTION(PAGE_SIZE)
63 #ifdef CONFIG_SHARED_KERNEL
64 . = ALIGN(0x100000); /* VM shared segments are 1MB aligned */
68 _eshared = .; /* End of shareable data */
69 _sdata = .; /* Start of data section */
72 __start_ro_after_init = .;
73 .data..ro_after_init : {
74 *(.data..ro_after_init)
78 __end_ro_after_init = .;
80 RW_DATA_SECTION(0x100, PAGE_SIZE, THREAD_SIZE)
82 _edata = .; /* End of data section */
84 /* will be freed after init */
85 . = ALIGN(PAGE_SIZE); /* Init code and data */
89 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
90 VMLINUX_SYMBOL(_sinittext) = . ;
93 VMLINUX_SYMBOL(_einittext) = . ;
97 * .exit.text is discarded at runtime, not link time,
98 * to deal with references from __bug_table
109 * struct alt_inst entries. From the header (alternative.h):
110 * "Alternative instructions for different CPU types or capabilities"
111 * Think locking instructions on spinlocks.
112 * Note, that it is a part of __init region.
116 __alt_instructions = .;
118 __alt_instructions_end = .;
122 * And here are the replacement instructions. The linker sticks
123 * them as binary blobs. The .altinstructions has enough data to
124 * get the address and the length of them to patch the kernel safely.
125 * Note, that it is a part of __init region.
127 .altinstr_replacement : {
128 *(.altinstr_replacement)
132 * Table with the patch locations to undo expolines
134 .nospec_call_table : {
135 __nospec_call_start = . ;
137 __nospec_call_end = . ;
139 .nospec_return_table : {
140 __nospec_return_start = . ;
142 __nospec_return_end = . ;
145 /* early.c uses stsi, which requires page aligned data. */
146 . = ALIGN(PAGE_SIZE);
147 INIT_DATA_SECTION(0x100)
149 PERCPU_SECTION(0x100)
150 . = ALIGN(PAGE_SIZE);
151 __init_end = .; /* freed after init ends here */
153 BSS_SECTION(PAGE_SIZE, 4 * PAGE_SIZE, PAGE_SIZE)
157 /* Debugging sections. */
161 /* Sections to be discarded */