1 /* ld script to make x86-64 Linux kernel
2 * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>;
5 #define LOAD_OFFSET __START_KERNEL_map
7 #include <asm-generic/vmlinux.lds.h>
8 #include <asm/asm-offsets.h>
11 #undef i386 /* in case the preprocessor is a 32bit one */
13 OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64", "elf64-x86-64")
14 OUTPUT_ARCH(i386:x86-64)
15 ENTRY(phys_startup_64)
19 text PT_LOAD FLAGS(5); /* R_E */
20 data PT_LOAD FLAGS(7); /* RWE */
21 user PT_LOAD FLAGS(7); /* RWE */
22 data.init PT_LOAD FLAGS(7); /* RWE */
24 percpu PT_LOAD FLAGS(7); /* RWE */
26 note PT_NOTE FLAGS(0); /* ___ */
31 phys_startup_64 = startup_64 - LOAD_OFFSET;
32 _text = .; /* Text and read-only data */
33 .text : AT(ADDR(.text) - LOAD_OFFSET) {
34 /* First the code that has to be first for bootstrapping */
45 _etext = .; /* End of text section */
50 . = ALIGN(16); /* Exception table */
51 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
52 __start___ex_table = .;
54 __stop___ex_table = .;
59 . = ALIGN(PAGE_SIZE); /* Align data segment to page size boundary */
61 .data : AT(ADDR(.data) - LOAD_OFFSET) {
66 _edata = .; /* End of data section */
69 . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
70 .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
71 *(.data.cacheline_aligned)
73 . = ALIGN(CONFIG_X86_INTERNODE_CACHE_BYTES);
74 .data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
78 #define VSYSCALL_ADDR (-10*1024*1024)
79 #define VSYSCALL_PHYS_ADDR ((LOADADDR(.data.read_mostly) + SIZEOF(.data.read_mostly) + 4095) & ~(4095))
80 #define VSYSCALL_VIRT_ADDR ((ADDR(.data.read_mostly) + SIZEOF(.data.read_mostly) + 4095) & ~(4095))
82 #define VLOAD_OFFSET (VSYSCALL_ADDR - VSYSCALL_PHYS_ADDR)
83 #define VLOAD(x) (ADDR(x) - VLOAD_OFFSET)
85 #define VVIRT_OFFSET (VSYSCALL_ADDR - VSYSCALL_VIRT_ADDR)
86 #define VVIRT(x) (ADDR(x) - VVIRT_OFFSET)
89 .vsyscall_0 : AT(VSYSCALL_PHYS_ADDR) { *(.vsyscall_0) } :user
90 __vsyscall_0 = VSYSCALL_VIRT_ADDR;
92 . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
93 .vsyscall_fn : AT(VLOAD(.vsyscall_fn)) { *(.vsyscall_fn) }
94 . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
95 .vsyscall_gtod_data : AT(VLOAD(.vsyscall_gtod_data))
96 { *(.vsyscall_gtod_data) }
97 vsyscall_gtod_data = VVIRT(.vsyscall_gtod_data);
98 .vsyscall_clock : AT(VLOAD(.vsyscall_clock))
99 { *(.vsyscall_clock) }
100 vsyscall_clock = VVIRT(.vsyscall_clock);
103 .vsyscall_1 ADDR(.vsyscall_0) + 1024: AT(VLOAD(.vsyscall_1))
105 .vsyscall_2 ADDR(.vsyscall_0) + 2048: AT(VLOAD(.vsyscall_2))
108 .vgetcpu_mode : AT(VLOAD(.vgetcpu_mode)) { *(.vgetcpu_mode) }
109 vgetcpu_mode = VVIRT(.vgetcpu_mode);
111 . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
112 .jiffies : AT(VLOAD(.jiffies)) { *(.jiffies) }
113 jiffies = VVIRT(.jiffies);
115 .vsyscall_3 ADDR(.vsyscall_0) + 3072: AT(VLOAD(.vsyscall_3))
118 . = VSYSCALL_VIRT_ADDR + PAGE_SIZE;
121 #undef VSYSCALL_PHYS_ADDR
122 #undef VSYSCALL_VIRT_ADDR
128 . = ALIGN(THREAD_SIZE); /* init_task */
129 .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
133 . = ALIGN(PAGE_SIZE);
134 .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
135 *(.data.page_aligned)
138 /* might get freed after init */
139 . = ALIGN(PAGE_SIZE);
142 .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
146 . = ALIGN(PAGE_SIZE);
149 . = ALIGN(PAGE_SIZE); /* Init code and data */
151 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
156 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
157 __initdata_begin = .;
164 .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) { *(.init.setup) }
166 __initcall_start = .;
167 .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
171 __con_initcall_start = .;
172 .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
173 *(.con_initcall.init)
175 __con_initcall_end = .;
176 __x86_cpu_dev_start = .;
177 .x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
180 __x86_cpu_dev_end = .;
184 .parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
185 __parainstructions = .;
187 __parainstructions_end = .;
191 __alt_instructions = .;
192 .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
195 __alt_instructions_end = .;
196 .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
197 *(.altinstr_replacement)
199 /* .exit.text is discard at runtime, not link time, to deal with references
200 from .altinstructions and .eh_frame */
201 .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
204 .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
208 #ifdef CONFIG_BLK_DEV_INITRD
209 . = ALIGN(PAGE_SIZE);
210 __initramfs_start = .;
211 .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) { *(.init.ramfs) }
217 * percpu offsets are zero-based on SMP. PERCPU_VADDR() changes the
218 * output PHDR, so the next output section - __data_nosave - should
219 * switch it back to data.init. Also, pda should be at the head of
220 * percpu area. Preallocate it and define the percpu offset symbol
221 * so that it can be accessed as a percpu variable.
223 . = ALIGN(PAGE_SIZE);
224 PERCPU_VADDR_PREALLOC(0, :percpu, pda_size)
225 per_cpu____pda = __per_cpu_start;
230 . = ALIGN(PAGE_SIZE);
233 . = ALIGN(PAGE_SIZE);
235 .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
237 } :data.init /* switch back to data.init, see PERCPU_VADDR() above */
238 . = ALIGN(PAGE_SIZE);
241 __bss_start = .; /* BSS */
242 .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
250 /* Sections to be discarded */
262 * Build-time check on the image size:
264 ASSERT((_end - _text <= KERNEL_IMAGE_SIZE),
265 "kernel image bigger than KERNEL_IMAGE_SIZE")