1 /* SPDX-License-Identifier: GPL-2.0 */
3 * ld script to make ARM Linux kernel
4 * taken from the i386 version by Russell King
5 * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
8 #include <asm/hyp_image.h>
10 #define HYPERVISOR_EXTABLE \
12 __start___kvm_ex_table = .; \
14 __stop___kvm_ex_table = .;
16 #define HYPERVISOR_RODATA_SECTIONS \
17 HYP_SECTION_NAME(.rodata) : { \
18 . = ALIGN(PAGE_SIZE); \
19 __hyp_rodata_start = .; \
20 *(HYP_SECTION_NAME(.data..ro_after_init)) \
21 *(HYP_SECTION_NAME(.rodata)) \
22 . = ALIGN(PAGE_SIZE); \
23 __hyp_rodata_end = .; \
26 #define HYPERVISOR_DATA_SECTION \
27 HYP_SECTION_NAME(.data) : { \
28 . = ALIGN(PAGE_SIZE); \
29 __hyp_data_start = .; \
30 *(HYP_SECTION_NAME(.data)) \
31 . = ALIGN(PAGE_SIZE); \
35 #define HYPERVISOR_PERCPU_SECTION \
36 . = ALIGN(PAGE_SIZE); \
37 HYP_SECTION_NAME(.data..percpu) : { \
38 *(HYP_SECTION_NAME(.data..percpu)) \
41 #define HYPERVISOR_RELOC_SECTION \
42 .hyp.reloc : ALIGN(4) { \
43 __hyp_reloc_begin = .; \
45 __hyp_reloc_end = .; \
48 #define BSS_FIRST_SECTIONS \
49 __hyp_bss_start = .; \
50 *(HYP_SECTION_NAME(.bss)) \
51 . = ALIGN(PAGE_SIZE); \
55 * We require that __hyp_bss_start and __bss_start are aligned, and enforce it
56 * with an assertion. But the BSS_SECTION macro places an empty .sbss section
57 * between them, which can in some cases cause the linker to misalign them. To
58 * work around the issue, force a page alignment for __bss_start.
60 #define SBSS_ALIGN PAGE_SIZE
61 #else /* CONFIG_KVM */
62 #define HYPERVISOR_EXTABLE
63 #define HYPERVISOR_RODATA_SECTIONS
64 #define HYPERVISOR_DATA_SECTION
65 #define HYPERVISOR_PERCPU_SECTION
66 #define HYPERVISOR_RELOC_SECTION
70 #define RO_EXCEPTION_TABLE_ALIGN 4
71 #define RUNTIME_DISCARD_EXIT
73 #include <asm-generic/vmlinux.lds.h>
74 #include <asm/cache.h>
75 #include <asm/kernel-pgtable.h>
76 #include <asm/kexec.h>
77 #include <asm/memory.h>
87 #define HYPERVISOR_TEXT \
88 . = ALIGN(PAGE_SIZE); \
89 __hyp_idmap_text_start = .; \
91 __hyp_idmap_text_end = .; \
92 __hyp_text_start = .; \
95 . = ALIGN(PAGE_SIZE); \
100 __idmap_text_start = .; \
102 __idmap_text_end = .;
104 #ifdef CONFIG_HIBERNATION
105 #define HIBERNATE_TEXT \
107 __hibernate_exit_text_start = .; \
108 *(.hibernate_exit.text) \
109 __hibernate_exit_text_end = .;
111 #define HIBERNATE_TEXT
114 #ifdef CONFIG_KEXEC_CORE
117 __relocate_new_kernel_start = .; \
118 *(.kexec_relocate.text) \
119 __relocate_new_kernel_end = .;
124 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
126 . = ALIGN(PAGE_SIZE); \
127 __entry_tramp_text_start = .; \
128 *(.entry.tramp.text) \
129 . = ALIGN(PAGE_SIZE); \
130 __entry_tramp_text_end = .; \
131 *(.entry.tramp.rodata)
136 #ifdef CONFIG_UNWIND_TABLES
137 #define UNWIND_DATA_SECTIONS \
139 __pi___eh_frame_start = .; \
141 __pi___eh_frame_end = .; \
144 #define UNWIND_DATA_SECTIONS
148 * The size of the PE/COFF section that covers the kernel image, which
149 * runs from _stext to _edata, must be a round multiple of the PE/COFF
150 * FileAlignment, which we set to its minimum value of 0x200. '_stext'
151 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned
152 * boundary should be sufficient.
154 PECOFF_FILE_ALIGNMENT = 0x200;
157 #define PECOFF_EDATA_PADDING \
158 .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); }
160 #define PECOFF_EDATA_PADDING
166 * XXX: The linker does not define how output sections are
167 * assigned to input sections when there are multiple statements
168 * matching the same input section name. There is no documented
174 *(.dynsym .dynstr .hash .gnu.hash)
184 .text : ALIGN(SEGMENT_ALIGN) { /* Real text segment */
185 _stext = .; /* Text and read-only data */
197 . = ALIGN(SEGMENT_ALIGN);
198 _etext = .; /* End of text section */
200 /* everything from this point to __init_begin will be marked RO NX */
203 HYPERVISOR_RODATA_SECTIONS
207 * Make sure that the .got.plt is either completely empty or it
208 * contains only the lazy dispatch entries.
210 .got.plt : { *(.got.plt) }
211 ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18,
212 "Unexpected GOT/PLT entries detected!")
214 /* code sections that are never executed via the kernel mapping */
220 . = ALIGN(PAGE_SIZE);
226 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
237 . = ALIGN(SEGMENT_ALIGN);
239 __inittext_begin = .;
243 __exittext_begin = .;
251 __alt_instructions = .;
253 __alt_instructions_end = .;
258 . = ALIGN(SEGMENT_ALIGN);
260 __initdata_begin = .;
262 __pi_init_idmap_pg_dir = .;
263 . += INIT_IDMAP_DIR_SIZE;
264 __pi_init_idmap_pg_end = .;
272 *(.init.altinstructions .init.bss) /* from the EFI stub */
278 RUNTIME_CONST_VARIABLES
280 PERCPU_SECTION(L1_CACHE_BYTES)
281 HYPERVISOR_PERCPU_SECTION
283 HYPERVISOR_RELOC_SECTION
285 .rela.dyn : ALIGN(8) {
291 .relr.dyn : ALIGN(8) {
297 . = ALIGN(SEGMENT_ALIGN);
301 .data.rel.ro : { *(.data.rel.ro) }
302 ASSERT(SIZEOF(.data.rel.ro) == 0, "Unexpected RELRO detected!")
306 RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN)
308 HYPERVISOR_DATA_SECTION
311 * Data written with the MMU off but read with the MMU on requires
312 * cache lines to be invalidated, discarding up to a Cache Writeback
313 * Granule (CWG) of data from the cache. Keep the section that
314 * requires this type of maintenance to be in its own Cache Writeback
315 * Granule (CWG) area so the cache maintenance operations don't
316 * interfere with adjacent data.
318 .mmuoff.data.write : ALIGN(SZ_2K) {
319 __mmuoff_data_start = .;
320 *(.mmuoff.data.write)
323 .mmuoff.data.read : {
325 __mmuoff_data_end = .;
329 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin);
332 /* start of zero-init region */
333 BSS_SECTION(SBSS_ALIGN, 0, 0)
334 __pi___bss_start = __bss_start;
336 . = ALIGN(PAGE_SIZE);
337 __pi_init_pg_dir = .;
339 __pi_init_pg_end = .;
340 /* end of zero-init region */
342 . += SZ_4K; /* stack for the early C runtime */
343 early_init_stack = .;
345 . = ALIGN(SEGMENT_ALIGN);
346 __pecoff_data_size = ABSOLUTE(. - __initdata_begin);
357 * Sections that should stay zero sized, which is safer to
358 * explicitly check instead of blindly discarding.
361 *(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt)
363 ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!")
366 #include "image-vars.h"
369 * The HYP init code and ID map text can't be longer than a page each. The
370 * former is page-aligned, but the latter may not be with 16K or 64K pages, so
371 * it should also not cross a page boundary.
373 ASSERT(__hyp_idmap_text_end - __hyp_idmap_text_start <= PAGE_SIZE,
374 "HYP init code too big")
375 ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
376 "ID map text too big or misaligned")
377 #ifdef CONFIG_HIBERNATION
378 ASSERT(__hibernate_exit_text_end - __hibernate_exit_text_start <= SZ_4K,
379 "Hibernate exit text is bigger than 4 KiB")
380 ASSERT(__hibernate_exit_text_start == swsusp_arch_suspend_exit,
381 "Hibernate exit text does not start with swsusp_arch_suspend_exit")
383 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
384 ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) <= 3*PAGE_SIZE,
385 "Entry trampoline text too big")
388 ASSERT(__hyp_bss_start == __bss_start, "HYP and Host BSS are misaligned")
391 * If padding is applied before .head.text, virt<->phys conversions will fail.
393 ASSERT(_text == KIMAGE_VADDR, "HEAD is misaligned")
395 ASSERT(swapper_pg_dir - reserved_pg_dir == RESERVED_SWAPPER_OFFSET,
396 "RESERVED_SWAPPER_OFFSET is wrong!")
398 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
399 ASSERT(swapper_pg_dir - tramp_pg_dir == TRAMP_SWAPPER_OFFSET,
400 "TRAMP_SWAPPER_OFFSET is wrong!")
403 #ifdef CONFIG_KEXEC_CORE
404 /* kexec relocation code should fit into one KEXEC_CONTROL_PAGE_SIZE */
405 ASSERT(__relocate_new_kernel_end - __relocate_new_kernel_start <= SZ_4K,
406 "kexec relocation code is bigger than 4 KiB")
407 ASSERT(KEXEC_CONTROL_PAGE_SIZE >= SZ_4K, "KEXEC_CONTROL_PAGE_SIZE is broken")
408 ASSERT(__relocate_new_kernel_start == arm64_relocate_new_kernel,
409 "kexec control page does not start with arm64_relocate_new_kernel")