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>
8 #include <asm/ftrace.lds.h>
11 * Put .bss..swapper_pg_dir as the first thing in .bss. This will
12 * make sure it has 16k alignment.
14 #define BSS_FIRST_SECTIONS *(.bss..swapper_pg_dir) \
15 *(.bss..invalid_pg_dir)
17 #define RO_EXCEPTION_TABLE_ALIGN 16
19 /* Handle ro_after_init data on our own. */
20 #define RO_AFTER_INIT_DATA
22 #define RUNTIME_DISCARD_EXIT
26 #include <asm-generic/vmlinux.lds.h>
27 #include <asm/vmlinux.lds.h>
29 OUTPUT_FORMAT("elf64-s390", "elf64-s390", "elf64-s390")
30 OUTPUT_ARCH(s390:64-bit)
31 ENTRY(startup_continue)
35 text PT_LOAD FLAGS(5); /* R_E */
36 data PT_LOAD FLAGS(7); /* RWE */
37 note PT_NOTE FLAGS(0); /* ___ */
44 _stext = .; /* Start of text section */
45 _text = .; /* Text and read-only data */
53 FTRACE_HOTPATCH_TRAMPOLINES_TEXT
57 _etext = .; /* End of text section */
63 _sdata = .; /* Start of data section */
66 __start_ro_after_init = .;
67 .data..ro_after_init : {
68 *(.data..ro_after_init)
72 __end_ro_after_init = .;
75 *(.data.rel.ro .data.rel.ro.*)
83 RW_DATA(0x100, PAGE_SIZE, THREAD_SIZE)
91 _start_amode31_refs = .;
93 _end_amode31_refs = .;
97 _edata = .; /* End of data section */
99 /* will be freed after init */
100 . = ALIGN(PAGE_SIZE); /* Init code and data */
103 . = ALIGN(PAGE_SIZE);
104 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
107 . = ALIGN(PAGE_SIZE);
112 * .exit.text is discarded at runtime, not link time,
113 * to deal with references from __bug_table
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.
131 __alt_instructions = .;
133 __alt_instructions_end = .;
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.
142 .altinstr_replacement : {
143 *(.altinstr_replacement)
147 * Table with the patch locations to undo expolines
150 .nospec_call_table : {
151 __nospec_call_start = . ;
153 __nospec_call_end = . ;
155 .nospec_return_table : {
156 __nospec_return_start = . ;
158 __nospec_return_end = . ;
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.
167 . = ALIGN(PAGE_SIZE);
172 *(.amode31.text.*_indirect_*)
173 . = ALIGN(PAGE_SIZE);
177 .amode31.ex_table : {
178 _start_amode31_ex_table = .;
179 KEEP(*(.amode31.ex_table))
180 _stop_amode31_ex_table = .;
182 . = ALIGN(PAGE_SIZE);
186 . = _samode31 + AMODE31_SIZE;
189 /* early.c uses stsi, which requires page aligned data. */
190 . = ALIGN(PAGE_SIZE);
191 INIT_DATA_SECTION(0x100)
193 RUNTIME_CONST_VARIABLES
195 PERCPU_SECTION(0x100)
197 . = ALIGN(PAGE_SIZE);
198 __init_end = .; /* freed after init ends here */
200 BSS_SECTION(PAGE_SIZE, 4 * PAGE_SIZE, PAGE_SIZE)
202 . = ALIGN(PAGE_SIZE);
206 * uncompressed image info used by the decompressor
207 * it should match struct vmlinux_info
209 .vmlinux.info 0 (INFO) : {
210 QUAD(startup_continue) /* entry */
211 QUAD(__bss_start - _stext) /* image_size */
212 QUAD(__bss_stop - __bss_start) /* bss_size */
213 QUAD(__boot_data_start) /* bootdata_off */
214 QUAD(__boot_data_end - __boot_data_start) /* bootdata_size */
215 QUAD(__boot_data_preserved_start) /* bootdata_preserved_off */
216 QUAD(__boot_data_preserved_end -
217 __boot_data_preserved_start) /* bootdata_preserved_size */
218 QUAD(__got_start) /* got_start */
219 QUAD(__got_end) /* got_end */
220 QUAD(_eamode31 - _samode31) /* amode31_size */
224 QUAD(__alt_instructions)
225 QUAD(__alt_instructions_end)
227 QUAD(kasan_early_shadow_page)
228 QUAD(kasan_early_shadow_pte)
229 QUAD(kasan_early_shadow_pmd)
230 QUAD(kasan_early_shadow_pud)
231 QUAD(kasan_early_shadow_p4d)
235 /* Debugging sections. */
241 * Make sure that the .got.plt is either completely empty or it
242 * contains only the three reserved double words.
247 ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, "Unexpected GOT/PLT entries detected!")
250 * Sections that should stay zero sized, which is safer to
251 * explicitly check instead of blindly discarding.
254 *(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt)
256 ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!")
258 *(.rela.*) *(.rela_*)
260 ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!")
262 /* Sections to be discarded */