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) = .;
50 * The size of the PE/COFF section that covers the kernel image, which
51 * runs from stext to _edata, must be a round multiple of the PE/COFF
52 * FileAlignment, which we set to its minimum value of 0x200. 'stext'
53 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned
54 * boundary should be sufficient.
56 PECOFF_FILE_ALIGNMENT = 0x200;
59 #define PECOFF_EDATA_PADDING \
60 .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); }
62 #define PECOFF_EDATA_PADDING
65 #if defined(CONFIG_DEBUG_ALIGN_RODATA)
67 * 4 KB granule: 1 level 2 entry
68 * 16 KB granule: 128 level 3 entries, with contiguous bit
69 * 64 KB granule: 32 level 3 entries, with contiguous bit
71 #define SEGMENT_ALIGN SZ_2M
74 * 4 KB granule: 16 level 3 entries, with contiguous bit
75 * 16 KB granule: 4 level 3 entries, without contiguous bit
76 * 64 KB granule: 1 level 3 entry
78 #define SEGMENT_ALIGN SZ_64K
84 * XXX: The linker does not define how output sections are
85 * assigned to input sections when there are multiple statements
86 * matching the same input section name. There is no documented
90 ARM_EXIT_DISCARD(EXIT_TEXT)
91 ARM_EXIT_DISCARD(EXIT_DATA)
98 . = KIMAGE_VADDR + TEXT_OFFSET;
104 .text : { /* Real text segment */
105 _stext = .; /* Text and read-only data */
106 __exception_text_start = .;
108 __exception_text_end = .;
118 *(.got) /* Global offset table */
121 . = ALIGN(SEGMENT_ALIGN);
122 RO_DATA(PAGE_SIZE) /* everything from this point to */
123 EXCEPTION_TABLE(8) /* _etext will be marked RO NX */
126 . = ALIGN(SEGMENT_ALIGN);
127 _etext = .; /* End of text and rodata section */
132 ARM_EXIT_KEEP(EXIT_TEXT)
144 ARM_EXIT_KEEP(EXIT_DATA)
147 PERCPU_SECTION(L1_CACHE_BYTES)
151 __alt_instructions = .;
153 __alt_instructions_end = .;
155 .altinstr_replacement : {
156 *(.altinstr_replacement)
171 __rela_offset = ADDR(.rela) - KIMAGE_VADDR;
172 __rela_size = SIZEOF(.rela);
173 __dynsym_offset = ADDR(.dynsym) - KIMAGE_VADDR;
175 . = ALIGN(SEGMENT_ALIGN);
180 RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
186 . = ALIGN(PAGE_SIZE);
190 . += SWAPPER_DIR_SIZE;
200 * The HYP init code and ID map text can't be longer than a page each,
201 * and should not cross a page boundary.
203 ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
204 "HYP init code too big or misaligned")
205 ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
206 "ID map text too big or misaligned")
209 * If padding is applied before .head.text, virt<->phys conversions will fail.
211 ASSERT(_text == (KIMAGE_VADDR + TEXT_OFFSET), "HEAD is misaligned")