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>
10 #undef i386 /* in case the preprocessor is a 32bit one */
12 OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64", "elf64-x86-64")
13 OUTPUT_ARCH(i386:x86-64)
14 ENTRY(phys_startup_64)
18 text PT_LOAD FLAGS(5); /* R_E */
19 data PT_LOAD FLAGS(7); /* RWE */
20 user PT_LOAD FLAGS(7); /* RWE */
21 data.init PT_LOAD FLAGS(7); /* RWE */
22 note PT_NOTE FLAGS(0); /* ___ */
27 phys_startup_64 = startup_64 - LOAD_OFFSET;
28 _text = .; /* Text and read-only data */
29 .text : AT(ADDR(.text) - LOAD_OFFSET) {
30 /* First the code that has to be first for bootstrapping */
41 _etext = .; /* End of text section */
46 . = ALIGN(16); /* Exception table */
47 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
48 __start___ex_table = .;
50 __stop___ex_table = .;
55 . = ALIGN(PAGE_SIZE); /* Align data segment to page size boundary */
57 .data : AT(ADDR(.data) - LOAD_OFFSET) {
62 _edata = .; /* End of data section */
65 . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
66 .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
67 *(.data.cacheline_aligned)
69 . = ALIGN(CONFIG_X86_INTERNODE_CACHE_BYTES);
70 .data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
74 #define VSYSCALL_ADDR (-10*1024*1024)
75 #define VSYSCALL_PHYS_ADDR ((LOADADDR(.data.read_mostly) + SIZEOF(.data.read_mostly) + 4095) & ~(4095))
76 #define VSYSCALL_VIRT_ADDR ((ADDR(.data.read_mostly) + SIZEOF(.data.read_mostly) + 4095) & ~(4095))
78 #define VLOAD_OFFSET (VSYSCALL_ADDR - VSYSCALL_PHYS_ADDR)
79 #define VLOAD(x) (ADDR(x) - VLOAD_OFFSET)
81 #define VVIRT_OFFSET (VSYSCALL_ADDR - VSYSCALL_VIRT_ADDR)
82 #define VVIRT(x) (ADDR(x) - VVIRT_OFFSET)
85 .vsyscall_0 : AT(VSYSCALL_PHYS_ADDR) { *(.vsyscall_0) } :user
86 __vsyscall_0 = VSYSCALL_VIRT_ADDR;
88 . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
89 .vsyscall_fn : AT(VLOAD(.vsyscall_fn)) { *(.vsyscall_fn) }
90 . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
91 .vsyscall_gtod_data : AT(VLOAD(.vsyscall_gtod_data))
92 { *(.vsyscall_gtod_data) }
93 vsyscall_gtod_data = VVIRT(.vsyscall_gtod_data);
94 .vsyscall_clock : AT(VLOAD(.vsyscall_clock))
95 { *(.vsyscall_clock) }
96 vsyscall_clock = VVIRT(.vsyscall_clock);
99 .vsyscall_1 ADDR(.vsyscall_0) + 1024: AT(VLOAD(.vsyscall_1))
101 .vsyscall_2 ADDR(.vsyscall_0) + 2048: AT(VLOAD(.vsyscall_2))
104 .vgetcpu_mode : AT(VLOAD(.vgetcpu_mode)) { *(.vgetcpu_mode) }
105 vgetcpu_mode = VVIRT(.vgetcpu_mode);
107 . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
108 .jiffies : AT(VLOAD(.jiffies)) { *(.jiffies) }
109 jiffies = VVIRT(.jiffies);
111 .vsyscall_3 ADDR(.vsyscall_0) + 3072: AT(VLOAD(.vsyscall_3))
114 . = VSYSCALL_VIRT_ADDR + PAGE_SIZE;
117 #undef VSYSCALL_PHYS_ADDR
118 #undef VSYSCALL_VIRT_ADDR
124 . = ALIGN(THREAD_SIZE); /* init_task */
125 .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
129 . = ALIGN(PAGE_SIZE);
130 .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
131 *(.data.page_aligned)
134 /* might get freed after init */
135 . = ALIGN(PAGE_SIZE);
138 .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
142 . = ALIGN(PAGE_SIZE);
145 . = ALIGN(PAGE_SIZE); /* Init code and data */
147 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
152 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
153 __initdata_begin = .;
160 .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) { *(.init.setup) }
162 __initcall_start = .;
163 .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
167 __con_initcall_start = .;
168 .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
169 *(.con_initcall.init)
171 __con_initcall_end = .;
172 __x86_cpu_dev_start = .;
173 .x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
176 __x86_cpu_dev_end = .;
180 .parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
181 __parainstructions = .;
183 __parainstructions_end = .;
187 __alt_instructions = .;
188 .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
191 __alt_instructions_end = .;
192 .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
193 *(.altinstr_replacement)
195 /* .exit.text is discard at runtime, not link time, to deal with references
196 from .altinstructions and .eh_frame */
197 .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
200 .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
204 #ifdef CONFIG_BLK_DEV_INITRD
205 . = ALIGN(PAGE_SIZE);
206 __initramfs_start = .;
207 .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) { *(.init.ramfs) }
213 . = ALIGN(PAGE_SIZE);
216 . = ALIGN(PAGE_SIZE);
218 .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) { *(.data.nosave) }
219 . = ALIGN(PAGE_SIZE);
222 __bss_start = .; /* BSS */
223 .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
231 /* Sections to be discarded */
243 * Build-time check on the image size:
245 ASSERT((_end - _text <= KERNEL_IMAGE_SIZE),
246 "kernel image bigger than KERNEL_IMAGE_SIZE")