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(SEGMENT_ALIGN);
152 __inittext_begin = .;
156 ARM_EXIT_KEEP(EXIT_TEXT)
161 __alt_instructions = .;
163 __alt_instructions_end = .;
166 . = ALIGN(PAGE_SIZE);
168 __initdata_begin = .;
177 *(.init.rodata.* .init.bss) /* from the EFI stub */
180 ARM_EXIT_KEEP(EXIT_DATA)
183 PERCPU_SECTION(L1_CACHE_BYTES)
185 .rela.dyn : ALIGN(8) {
189 __rela_offset = ABSOLUTE(ADDR(.rela.dyn) - KIMAGE_VADDR);
190 __rela_size = SIZEOF(.rela.dyn);
192 . = ALIGN(SEGMENT_ALIGN);
198 RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN)
201 * Data written with the MMU off but read with the MMU on requires
202 * cache lines to be invalidated, discarding up to a Cache Writeback
203 * Granule (CWG) of data from the cache. Keep the section that
204 * requires this type of maintenance to be in its own Cache Writeback
205 * Granule (CWG) area so the cache maintenance operations don't
206 * interfere with adjacent data.
208 .mmuoff.data.write : ALIGN(SZ_2K) {
209 __mmuoff_data_start = .;
210 *(.mmuoff.data.write)
213 .mmuoff.data.read : {
215 __mmuoff_data_end = .;
219 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin);
224 . = ALIGN(PAGE_SIZE);
228 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
233 #ifdef CONFIG_ARM64_SW_TTBR0_PAN
235 . += RESERVED_TTBR0_SIZE;
238 . += SWAPPER_DIR_SIZE;
241 __pecoff_data_size = ABSOLUTE(. - __initdata_begin);
250 * The HYP init code and ID map text can't be longer than a page each,
251 * and should not cross a page boundary.
253 ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
254 "HYP init code too big or misaligned")
255 ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
256 "ID map text too big or misaligned")
257 #ifdef CONFIG_HIBERNATION
258 ASSERT(__hibernate_exit_text_end - (__hibernate_exit_text_start & ~(SZ_4K - 1))
259 <= SZ_4K, "Hibernate exit text too big or misaligned")
261 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
262 ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) <= 3*PAGE_SIZE,
263 "Entry trampoline text too big")
266 * If padding is applied before .head.text, virt<->phys conversions will fail.
268 ASSERT(_text == (KIMAGE_VADDR + TEXT_OFFSET), "HEAD is misaligned")