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)
76 #define ALIGN_DEBUG_RO . = ALIGN(1<<SECTION_SHIFT);
77 #define ALIGN_DEBUG_RO_MIN(min) ALIGN_DEBUG_RO
78 #elif defined(CONFIG_DEBUG_RODATA)
79 #define ALIGN_DEBUG_RO . = ALIGN(1<<PAGE_SHIFT);
80 #define ALIGN_DEBUG_RO_MIN(min) ALIGN_DEBUG_RO
82 #define ALIGN_DEBUG_RO
83 #define ALIGN_DEBUG_RO_MIN(min) . = ALIGN(min);
89 * XXX: The linker does not define how output sections are
90 * assigned to input sections when there are multiple statements
91 * matching the same input section name. There is no documented
95 ARM_EXIT_DISCARD(EXIT_TEXT)
96 ARM_EXIT_DISCARD(EXIT_DATA)
102 . = PAGE_OFFSET + TEXT_OFFSET;
109 .text : { /* Real text segment */
110 _stext = .; /* Text and read-only data */
111 __exception_text_start = .;
113 __exception_text_end = .;
126 *(.got) /* Global offset table */
134 _etext = .; /* End of text and rodata section */
136 ALIGN_DEBUG_RO_MIN(PAGE_SIZE)
141 ARM_EXIT_KEEP(EXIT_TEXT)
144 ALIGN_DEBUG_RO_MIN(16)
154 ARM_EXIT_KEEP(EXIT_DATA)
157 PERCPU_SECTION(L1_CACHE_BYTES)
161 __alt_instructions = .;
163 __alt_instructions_end = .;
165 .altinstr_replacement : {
166 *(.altinstr_replacement)
169 . = ALIGN(PAGE_SIZE);
174 RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
180 . = ALIGN(PAGE_SIZE);
184 . += SWAPPER_DIR_SIZE;
194 * The HYP init code and ID map text can't be longer than a page each,
195 * and should not cross a page boundary.
197 ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
198 "HYP init code too big or misaligned")
199 ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
200 "ID map text too big or misaligned")
201 #ifdef CONFIG_HIBERNATION
202 ASSERT(__hibernate_exit_text_end - (__hibernate_exit_text_start & ~(SZ_4K - 1))
203 <= SZ_4K, "Hibernate exit text too big or misaligned")
207 * If padding is applied before .head.text, virt<->phys conversions will fail.
209 ASSERT(_text == (PAGE_OFFSET + TEXT_OFFSET), "HEAD is misaligned")