2 * ld script for the x86 kernel
4 * Historic 32-bit version written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
6 * Modernisation and unification done by Sam Ravnborg <sam@ravnborg.org>
9 * Don't define absolute symbols until and unless you know that symbol
10 * value is should remain constant even if kernel image is relocated
11 * at run time. Absolute symbols are not relocated. If symbol value should
12 * change if kernel is relocated, make the symbol section relative and
13 * put it inside the section definition.
17 #define LOAD_OFFSET __PAGE_OFFSET
19 #define LOAD_OFFSET __START_KERNEL_map
22 #include <asm-generic/vmlinux.lds.h>
23 #include <asm/asm-offsets.h>
24 #include <asm/thread_info.h>
25 #include <asm/page_types.h>
26 #include <asm/cache.h>
29 #undef i386 /* in case the preprocessor is a 32bit one */
31 OUTPUT_FORMAT(CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT)
35 ENTRY(phys_startup_32)
38 OUTPUT_ARCH(i386:x86-64)
39 ENTRY(phys_startup_64)
44 text PT_LOAD FLAGS(5); /* R_E */
45 data PT_LOAD FLAGS(7); /* RWE */
47 user PT_LOAD FLAGS(7); /* RWE */
48 data.init PT_LOAD FLAGS(7); /* RWE */
50 percpu PT_LOAD FLAGS(7); /* RWE */
52 data.init2 PT_LOAD FLAGS(7); /* RWE */
54 note PT_NOTE FLAGS(0); /* ___ */
60 . = LOAD_OFFSET + LOAD_PHYSICAL_ADDR;
61 phys_startup_32 = startup_32 - LOAD_OFFSET;
64 phys_startup_64 = startup_64 - LOAD_OFFSET;
67 /* Text and read-only data */
69 /* bootstrapping code */
70 .text.head : AT(ADDR(.text.head) - LOAD_OFFSET) {
75 /* The rest of the text */
76 .text : AT(ADDR(.text) - LOAD_OFFSET) {
78 /* not really needed, already page aligned */
91 /* End of text section */
99 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
100 __start___ex_table = .;
102 __stop___ex_table = .;
108 . = ALIGN(PAGE_SIZE);
109 .data : AT(ADDR(.data) - LOAD_OFFSET) {
114 /* End of data section */
120 /* 32 bit has nosave before _edata */
121 . = ALIGN(PAGE_SIZE);
122 .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
125 . = ALIGN(PAGE_SIZE);
130 . = ALIGN(PAGE_SIZE);
131 .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
132 *(.data.page_aligned)
139 . = ALIGN(PAGE_SIZE);
140 . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
142 .data.cacheline_aligned :
143 AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
144 *(.data.cacheline_aligned)
147 /* rarely changed data like cpu maps */
151 . = ALIGN(CONFIG_X86_INTERNODE_CACHE_BYTES);
153 .data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
157 /* End of data section */
164 # include "vmlinux_32.lds.S"
166 # include "vmlinux_64.lds.S"
175 ASSERT((_end - LOAD_OFFSET <= KERNEL_IMAGE_SIZE),
176 "kernel image bigger than KERNEL_IMAGE_SIZE")
179 * Per-cpu symbols which need to be offset from __per_cpu_load
180 * for the boot processor.
182 #define INIT_PER_CPU(x) init_per_cpu__##x = per_cpu__##x + __per_cpu_load
183 INIT_PER_CPU(gdt_page);
184 INIT_PER_CPU(irq_stack_union);
187 * Build-time check on the image size:
189 ASSERT((_end - _text <= KERNEL_IMAGE_SIZE),
190 "kernel image bigger than KERNEL_IMAGE_SIZE")
193 ASSERT((per_cpu__irq_stack_union == 0),
194 "irq_stack_union is not at start of per-cpu area");
197 #endif /* CONFIG_X86_32 */
200 #include <asm/kexec.h>
202 ASSERT(kexec_control_code_size <= KEXEC_CONTROL_CODE_MAX_SIZE,
203 "kexec control code size is too big")