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-generic/vmlinux.lds.h>
10 #include <asm/kernel-pgtable.h>
11 #include <asm/thread_info.h>
12 #include <asm/memory.h>
14 #include <asm/pgtable.h>
18 /* .exit.text needed in case of alternative patching */
19 #define ARM_EXIT_KEEP(x) x
20 #define ARM_EXIT_DISCARD(x)
28 #define HYPERVISOR_EXTABLE \
30 __start___kvm_ex_table = .; \
32 __stop___kvm_ex_table = .;
34 #define HYPERVISOR_TEXT \
36 * Align to 4 KB so that \
37 * a) the HYP vector table is at its minimum \
38 * alignment of 2048 bytes \
39 * b) the HYP init code will not cross a page \
40 * boundary if its size does not exceed \
41 * 4 KB (see related ASSERT() below) \
44 __hyp_idmap_text_start = .; \
46 __hyp_idmap_text_end = .; \
47 __hyp_text_start = .; \
54 __idmap_text_start = .; \
58 #ifdef CONFIG_HIBERNATION
59 #define HIBERNATE_TEXT \
61 __hibernate_exit_text_start = .; \
62 *(.hibernate_exit.text) \
63 __hibernate_exit_text_end = .;
65 #define HIBERNATE_TEXT
68 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
70 . = ALIGN(PAGE_SIZE); \
71 __entry_tramp_text_start = .; \
72 *(.entry.tramp.text) \
73 . = ALIGN(PAGE_SIZE); \
74 __entry_tramp_text_end = .;
80 * The size of the PE/COFF section that covers the kernel image, which
81 * runs from stext to _edata, must be a round multiple of the PE/COFF
82 * FileAlignment, which we set to its minimum value of 0x200. 'stext'
83 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned
84 * boundary should be sufficient.
86 PECOFF_FILE_ALIGNMENT = 0x200;
89 #define PECOFF_EDATA_PADDING \
90 .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); }
92 #define PECOFF_EDATA_PADDING
98 * XXX: The linker does not define how output sections are
99 * assigned to input sections when there are multiple statements
100 * matching the same input section name. There is no documented
104 ARM_EXIT_DISCARD(EXIT_TEXT)
105 ARM_EXIT_DISCARD(EXIT_DATA)
110 *(.dynsym .dynstr .hash .gnu.hash)
114 . = KIMAGE_VADDR + TEXT_OFFSET;
120 .text : { /* Real text segment */
121 _stext = .; /* Text and read-only data */
122 __exception_text_start = .;
124 __exception_text_end = .;
140 *(.got) /* Global offset table */
143 . = ALIGN(SEGMENT_ALIGN);
144 _etext = .; /* End of text section */
146 RO_DATA(PAGE_SIZE) /* everything from this point to */
147 EXCEPTION_TABLE(8) /* __init_begin will be marked RO NX */
150 . = ALIGN(PAGE_SIZE);
155 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
166 . = ALIGN(SEGMENT_ALIGN);
168 __inittext_begin = .;
172 __exittext_begin = .;
174 ARM_EXIT_KEEP(EXIT_TEXT)
180 __alt_instructions = .;
182 __alt_instructions_end = .;
185 . = ALIGN(PAGE_SIZE);
187 __initdata_begin = .;
195 *(.init.rodata.* .init.bss) /* from the EFI stub */
198 ARM_EXIT_KEEP(EXIT_DATA)
201 PERCPU_SECTION(L1_CACHE_BYTES)
203 .rela.dyn : ALIGN(8) {
207 __rela_offset = ABSOLUTE(ADDR(.rela.dyn) - KIMAGE_VADDR);
208 __rela_size = SIZEOF(.rela.dyn);
211 .relr.dyn : ALIGN(8) {
215 __relr_offset = ABSOLUTE(ADDR(.relr.dyn) - KIMAGE_VADDR);
216 __relr_size = SIZEOF(.relr.dyn);
219 . = ALIGN(SEGMENT_ALIGN);
225 RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN)
228 * Data written with the MMU off but read with the MMU on requires
229 * cache lines to be invalidated, discarding up to a Cache Writeback
230 * Granule (CWG) of data from the cache. Keep the section that
231 * requires this type of maintenance to be in its own Cache Writeback
232 * Granule (CWG) area so the cache maintenance operations don't
233 * interfere with adjacent data.
235 .mmuoff.data.write : ALIGN(SZ_2K) {
236 __mmuoff_data_start = .;
237 *(.mmuoff.data.write)
240 .mmuoff.data.read : {
242 __mmuoff_data_end = .;
246 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin);
251 . = ALIGN(PAGE_SIZE);
256 __pecoff_data_size = ABSOLUTE(. - __initdata_begin);
264 #include "image-vars.h"
267 * The HYP init code and ID map text can't be longer than a page each,
268 * and should not cross a page boundary.
270 ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
271 "HYP init code too big or misaligned")
272 ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
273 "ID map text too big or misaligned")
274 #ifdef CONFIG_HIBERNATION
275 ASSERT(__hibernate_exit_text_end - (__hibernate_exit_text_start & ~(SZ_4K - 1))
276 <= SZ_4K, "Hibernate exit text too big or misaligned")
278 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
279 ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) <= 3*PAGE_SIZE,
280 "Entry trampoline text too big")
283 * If padding is applied before .head.text, virt<->phys conversions will fail.
285 ASSERT(_text == (KIMAGE_VADDR + TEXT_OFFSET), "HEAD is misaligned")