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)
27 #define HYPERVISOR_TEXT \
29 * Align to 4 KB so that \
30 * a) the HYP vector table is at its minimum \
31 * alignment of 2048 bytes \
32 * b) the HYP init code will not cross a page \
33 * boundary if its size does not exceed \
34 * 4 KB (see related ASSERT() below) \
37 __hyp_idmap_text_start = .; \
39 __hyp_idmap_text_end = .; \
40 __hyp_text_start = .; \
46 __idmap_text_start = .; \
50 #ifdef CONFIG_HIBERNATION
51 #define HIBERNATE_TEXT \
53 __hibernate_exit_text_start = .; \
54 *(.hibernate_exit.text) \
55 __hibernate_exit_text_end = .;
57 #define HIBERNATE_TEXT
60 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
62 . = ALIGN(PAGE_SIZE); \
63 __entry_tramp_text_start = .; \
64 *(.entry.tramp.text) \
65 . = ALIGN(PAGE_SIZE); \
66 __entry_tramp_text_end = .;
72 * The size of the PE/COFF section that covers the kernel image, which
73 * runs from stext to _edata, must be a round multiple of the PE/COFF
74 * FileAlignment, which we set to its minimum value of 0x200. 'stext'
75 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned
76 * boundary should be sufficient.
78 PECOFF_FILE_ALIGNMENT = 0x200;
81 #define PECOFF_EDATA_PADDING \
82 .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); }
84 #define PECOFF_EDATA_PADDING
90 * XXX: The linker does not define how output sections are
91 * assigned to input sections when there are multiple statements
92 * matching the same input section name. There is no documented
96 ARM_EXIT_DISCARD(EXIT_TEXT)
97 ARM_EXIT_DISCARD(EXIT_DATA)
102 *(.dynsym .dynstr .hash)
105 . = KIMAGE_VADDR + TEXT_OFFSET;
111 .text : { /* Real text segment */
112 _stext = .; /* Text and read-only data */
113 __exception_text_start = .;
115 __exception_text_end = .;
131 *(.got) /* Global offset table */
134 . = ALIGN(SEGMENT_ALIGN);
135 _etext = .; /* End of text section */
137 RO_DATA(PAGE_SIZE) /* everything from this point to */
138 EXCEPTION_TABLE(8) /* __init_begin will be marked RO NX */
141 . = ALIGN(PAGE_SIZE);
145 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
150 #ifdef CONFIG_ARM64_SW_TTBR0_PAN
152 . += RESERVED_TTBR0_SIZE;
158 . = ALIGN(SEGMENT_ALIGN);
160 __inittext_begin = .;
164 ARM_EXIT_KEEP(EXIT_TEXT)
169 __alt_instructions = .;
171 __alt_instructions_end = .;
173 .altinstr_replacement : {
174 *(.altinstr_replacement)
177 . = ALIGN(PAGE_SIZE);
179 __initdata_begin = .;
187 *(.init.rodata.* .init.bss) /* from the EFI stub */
190 ARM_EXIT_KEEP(EXIT_DATA)
193 PERCPU_SECTION(L1_CACHE_BYTES)
199 __rela_offset = ABSOLUTE(ADDR(.rela) - KIMAGE_VADDR);
200 __rela_size = SIZEOF(.rela);
202 . = ALIGN(SEGMENT_ALIGN);
208 RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN)
211 * Data written with the MMU off but read with the MMU on requires
212 * cache lines to be invalidated, discarding up to a Cache Writeback
213 * Granule (CWG) of data from the cache. Keep the section that
214 * requires this type of maintenance to be in its own Cache Writeback
215 * Granule (CWG) area so the cache maintenance operations don't
216 * interfere with adjacent data.
218 .mmuoff.data.write : ALIGN(SZ_2K) {
219 __mmuoff_data_start = .;
220 *(.mmuoff.data.write)
223 .mmuoff.data.read : {
225 __mmuoff_data_end = .;
229 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin);
234 . = ALIGN(PAGE_SIZE);
239 __pecoff_data_size = ABSOLUTE(. - __initdata_begin);
248 * The HYP init code and ID map text can't be longer than a page each,
249 * and should not cross a page boundary.
251 ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
252 "HYP init code too big or misaligned")
253 ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
254 "ID map text too big or misaligned")
255 #ifdef CONFIG_HIBERNATION
256 ASSERT(__hibernate_exit_text_end - (__hibernate_exit_text_start & ~(SZ_4K - 1))
257 <= SZ_4K, "Hibernate exit text too big or misaligned")
259 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
260 ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) == PAGE_SIZE,
261 "Entry trampoline text too big")
264 * If padding is applied before .head.text, virt<->phys conversions will fail.
266 ASSERT(_text == (KIMAGE_VADDR + TEXT_OFFSET), "HEAD is misaligned")