2 * ld script to make ARM Linux kernel
3 * taken from the i386 version by Russell King
4 * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
7 #include <asm-generic/vmlinux.lds.h>
9 #include <asm/kernel-pgtable.h>
10 #include <asm/thread_info.h>
11 #include <asm/memory.h>
13 #include <asm/pgtable.h>
17 /* .exit.text needed in case of alternative patching */
18 #define ARM_EXIT_KEEP(x) x
19 #define ARM_EXIT_DISCARD(x)
26 #define HYPERVISOR_TEXT \
28 * Align to 4 KB so that \
29 * a) the HYP vector table is at its minimum \
30 * alignment of 2048 bytes \
31 * b) the HYP init code will not cross a page \
32 * boundary if its size does not exceed \
33 * 4 KB (see related ASSERT() below) \
36 VMLINUX_SYMBOL(__hyp_idmap_text_start) = .; \
38 VMLINUX_SYMBOL(__hyp_idmap_text_end) = .; \
39 VMLINUX_SYMBOL(__hyp_text_start) = .; \
41 VMLINUX_SYMBOL(__hyp_text_end) = .;
45 VMLINUX_SYMBOL(__idmap_text_start) = .; \
47 VMLINUX_SYMBOL(__idmap_text_end) = .;
49 #ifdef CONFIG_HIBERNATION
50 #define HIBERNATE_TEXT \
52 VMLINUX_SYMBOL(__hibernate_exit_text_start) = .;\
53 *(.hibernate_exit.text) \
54 VMLINUX_SYMBOL(__hibernate_exit_text_end) = .;
56 #define HIBERNATE_TEXT
60 * The size of the PE/COFF section that covers the kernel image, which
61 * runs from stext to _edata, must be a round multiple of the PE/COFF
62 * FileAlignment, which we set to its minimum value of 0x200. 'stext'
63 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned
64 * boundary should be sufficient.
66 PECOFF_FILE_ALIGNMENT = 0x200;
69 #define PECOFF_EDATA_PADDING \
70 .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); }
72 #define PECOFF_EDATA_PADDING
75 #if defined(CONFIG_DEBUG_ALIGN_RODATA)
77 * 4 KB granule: 1 level 2 entry
78 * 16 KB granule: 128 level 3 entries, with contiguous bit
79 * 64 KB granule: 32 level 3 entries, with contiguous bit
81 #define SEGMENT_ALIGN SZ_2M
84 * 4 KB granule: 16 level 3 entries, with contiguous bit
85 * 16 KB granule: 4 level 3 entries, without contiguous bit
86 * 64 KB granule: 1 level 3 entry
88 #define SEGMENT_ALIGN SZ_64K
94 * XXX: The linker does not define how output sections are
95 * assigned to input sections when there are multiple statements
96 * matching the same input section name. There is no documented
100 ARM_EXIT_DISCARD(EXIT_TEXT)
101 ARM_EXIT_DISCARD(EXIT_DATA)
106 *(.dynsym .dynstr .hash)
109 . = KIMAGE_VADDR + TEXT_OFFSET;
115 .text : { /* Real text segment */
116 _stext = .; /* Text and read-only data */
117 __exception_text_start = .;
119 __exception_text_end = .;
134 *(.got) /* Global offset table */
137 . = ALIGN(SEGMENT_ALIGN);
138 _etext = .; /* End of text section */
140 RO_DATA(PAGE_SIZE) /* everything from this point to */
141 EXCEPTION_TABLE(8) /* __init_begin will be marked RO NX */
144 . = ALIGN(SEGMENT_ALIGN);
146 __inittext_begin = .;
150 ARM_EXIT_KEEP(EXIT_TEXT)
155 __alt_instructions = .;
157 __alt_instructions_end = .;
159 .altinstr_replacement : {
160 *(.altinstr_replacement)
163 . = ALIGN(PAGE_SIZE);
165 __initdata_begin = .;
174 *(.init.rodata.* .init.bss) /* from the EFI stub */
177 ARM_EXIT_KEEP(EXIT_DATA)
180 PERCPU_SECTION(L1_CACHE_BYTES)
186 __rela_offset = ABSOLUTE(ADDR(.rela) - KIMAGE_VADDR);
187 __rela_size = SIZEOF(.rela);
189 . = ALIGN(SEGMENT_ALIGN);
195 RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
198 * Data written with the MMU off but read with the MMU on requires
199 * cache lines to be invalidated, discarding up to a Cache Writeback
200 * Granule (CWG) of data from the cache. Keep the section that
201 * requires this type of maintenance to be in its own Cache Writeback
202 * Granule (CWG) area so the cache maintenance operations don't
203 * interfere with adjacent data.
205 .mmuoff.data.write : ALIGN(SZ_2K) {
206 __mmuoff_data_start = .;
207 *(.mmuoff.data.write)
210 .mmuoff.data.read : {
212 __mmuoff_data_end = .;
216 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin);
221 . = ALIGN(PAGE_SIZE);
225 . += SWAPPER_DIR_SIZE;
227 #ifdef CONFIG_ARM64_SW_TTBR0_PAN
229 . += RESERVED_TTBR0_SIZE;
232 __pecoff_data_size = ABSOLUTE(. - __initdata_begin);
241 * The HYP init code and ID map text can't be longer than a page each,
242 * and should not cross a page boundary.
244 ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
245 "HYP init code too big or misaligned")
246 ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
247 "ID map text too big or misaligned")
248 #ifdef CONFIG_HIBERNATION
249 ASSERT(__hibernate_exit_text_end - (__hibernate_exit_text_start & ~(SZ_4K - 1))
250 <= SZ_4K, "Hibernate exit text too big or misaligned")
254 * If padding is applied before .head.text, virt<->phys conversions will fail.
256 ASSERT(_text == (KIMAGE_VADDR + TEXT_OFFSET), "HEAD is misaligned")