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1/*
2 * ld script for the x86 kernel
3 *
4 * Historic 32-bit version written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
5 *
6 * Modernisation, unification and other changes and fixes:
7 * Copyright (C) 2007-2009 Sam Ravnborg <sam@ravnborg.org>
8 *
9 *
10 * Don't define absolute symbols until and unless you know that symbol
11 * value is should remain constant even if kernel image is relocated
12 * at run time. Absolute symbols are not relocated. If symbol value should
13 * change if kernel is relocated, make the symbol section relative and
14 * put it inside the section definition.
15 */
16
17#ifdef CONFIG_X86_32
18#define LOAD_OFFSET __PAGE_OFFSET
19#else
20#define LOAD_OFFSET __START_KERNEL_map
21#endif
22
23#include <asm-generic/vmlinux.lds.h>
24#include <asm/asm-offsets.h>
25#include <asm/thread_info.h>
26#include <asm/page_types.h>
27#include <asm/cache.h>
28#include <asm/boot.h>
29
30#undef i386 /* in case the preprocessor is a 32bit one */
31
32OUTPUT_FORMAT(CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT)
33
34#ifdef CONFIG_X86_32
35OUTPUT_ARCH(i386)
36ENTRY(phys_startup_32)
37jiffies = jiffies_64;
38#else
39OUTPUT_ARCH(i386:x86-64)
40ENTRY(phys_startup_64)
41jiffies_64 = jiffies;
42#endif
43
44#if defined(CONFIG_X86_64) && defined(CONFIG_DEBUG_RODATA)
45/*
46 * On 64-bit, align RODATA to 2MB so that even with CONFIG_DEBUG_RODATA
47 * we retain large page mappings for boundaries spanning kernel text, rodata
48 * and data sections.
49 *
50 * However, kernel identity mappings will have different RWX permissions
51 * to the pages mapping to text and to the pages padding (which are freed) the
52 * text section. Hence kernel identity mappings will be broken to smaller
53 * pages. For 64-bit, kernel text and kernel identity mappings are different,
54 * so we can enable protection checks that come with CONFIG_DEBUG_RODATA,
55 * as well as retain 2MB large page mappings for kernel text.
56 */
57#define X64_ALIGN_DEBUG_RODATA_BEGIN . = ALIGN(HPAGE_SIZE);
58
59#define X64_ALIGN_DEBUG_RODATA_END \
60 . = ALIGN(HPAGE_SIZE); \
61 __end_rodata_hpage_align = .;
62
63#else
64
65#define X64_ALIGN_DEBUG_RODATA_BEGIN
66#define X64_ALIGN_DEBUG_RODATA_END
67
68#endif
69
70PHDRS {
71 text PT_LOAD FLAGS(5); /* R_E */
72 data PT_LOAD FLAGS(6); /* RW_ */
73#ifdef CONFIG_X86_64
74#ifdef CONFIG_SMP
75 percpu PT_LOAD FLAGS(6); /* RW_ */
76#endif
77 init PT_LOAD FLAGS(7); /* RWE */
78#endif
79 note PT_NOTE FLAGS(0); /* ___ */
80}
81
82SECTIONS
83{
84#ifdef CONFIG_X86_32
85 . = LOAD_OFFSET + LOAD_PHYSICAL_ADDR;
86 phys_startup_32 = startup_32 - LOAD_OFFSET;
87#else
88 . = __START_KERNEL;
89 phys_startup_64 = startup_64 - LOAD_OFFSET;
90#endif
91
92 /* Text and read-only data */
93 .text : AT(ADDR(.text) - LOAD_OFFSET) {
94 _text = .;
95 /* bootstrapping code */
96 HEAD_TEXT
97#ifdef CONFIG_X86_32
98 . = ALIGN(PAGE_SIZE);
99 *(.text..page_aligned)
100#endif
101 . = ALIGN(8);
102 _stext = .;
103 TEXT_TEXT
104 SCHED_TEXT
105 LOCK_TEXT
106 KPROBES_TEXT
107 ENTRY_TEXT
108 IRQENTRY_TEXT
109 *(.fixup)
110 *(.gnu.warning)
111 /* End of text section */
112 _etext = .;
113 } :text = 0x9090
114
115 NOTES :text :note
116
117 EXCEPTION_TABLE(16) :text = 0x9090
118
119#if defined(CONFIG_DEBUG_RODATA)
120 /* .text should occupy whole number of pages */
121 . = ALIGN(PAGE_SIZE);
122#endif
123 X64_ALIGN_DEBUG_RODATA_BEGIN
124 RO_DATA(PAGE_SIZE)
125 X64_ALIGN_DEBUG_RODATA_END
126
127 /* Data */
128 .data : AT(ADDR(.data) - LOAD_OFFSET) {
129 /* Start of data section */
130 _sdata = .;
131
132 /* init_task */
133 INIT_TASK_DATA(THREAD_SIZE)
134
135#ifdef CONFIG_X86_32
136 /* 32 bit has nosave before _edata */
137 NOSAVE_DATA
138#endif
139
140 PAGE_ALIGNED_DATA(PAGE_SIZE)
141
142 CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
143
144 DATA_DATA
145 CONSTRUCTORS
146
147 /* rarely changed data like cpu maps */
148 READ_MOSTLY_DATA(INTERNODE_CACHE_BYTES)
149
150 /* End of data section */
151 _edata = .;
152 } :data
153
154#ifdef CONFIG_X86_64
155
156 . = ALIGN(PAGE_SIZE);
157 __vvar_page = .;
158
159 .vvar : AT(ADDR(.vvar) - LOAD_OFFSET) {
160 /* work around gold bug 13023 */
161 __vvar_beginning_hack = .;
162
163 /* Place all vvars at the offsets in asm/vvar.h. */
164#define EMIT_VVAR(name, offset) \
165 . = __vvar_beginning_hack + offset; \
166 *(.vvar_ ## name)
167#define __VVAR_KERNEL_LDS
168#include <asm/vvar.h>
169#undef __VVAR_KERNEL_LDS
170#undef EMIT_VVAR
171
172 } :data
173
174 . = ALIGN(__vvar_page + PAGE_SIZE, PAGE_SIZE);
175
176#endif /* CONFIG_X86_64 */
177
178 /* Init code and data - will be freed after init */
179 . = ALIGN(PAGE_SIZE);
180 .init.begin : AT(ADDR(.init.begin) - LOAD_OFFSET) {
181 __init_begin = .; /* paired with __init_end */
182 }
183
184#if defined(CONFIG_X86_64) && defined(CONFIG_SMP)
185 /*
186 * percpu offsets are zero-based on SMP. PERCPU_VADDR() changes the
187 * output PHDR, so the next output section - .init.text - should
188 * start another segment - init.
189 */
190 PERCPU_VADDR(INTERNODE_CACHE_BYTES, 0, :percpu)
191#endif
192
193 INIT_TEXT_SECTION(PAGE_SIZE)
194#ifdef CONFIG_X86_64
195 :init
196#endif
197
198 INIT_DATA_SECTION(16)
199
200 /*
201 * Code and data for a variety of lowlevel trampolines, to be
202 * copied into base memory (< 1 MiB) during initialization.
203 * Since it is copied early, the main copy can be discarded
204 * afterwards.
205 */
206 .x86_trampoline : AT(ADDR(.x86_trampoline) - LOAD_OFFSET) {
207 x86_trampoline_start = .;
208 *(.x86_trampoline)
209 x86_trampoline_end = .;
210 }
211
212 .x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
213 __x86_cpu_dev_start = .;
214 *(.x86_cpu_dev.init)
215 __x86_cpu_dev_end = .;
216 }
217
218 /*
219 * start address and size of operations which during runtime
220 * can be patched with virtualization friendly instructions or
221 * baremetal native ones. Think page table operations.
222 * Details in paravirt_types.h
223 */
224 . = ALIGN(8);
225 .parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
226 __parainstructions = .;
227 *(.parainstructions)
228 __parainstructions_end = .;
229 }
230
231 /*
232 * struct alt_inst entries. From the header (alternative.h):
233 * "Alternative instructions for different CPU types or capabilities"
234 * Think locking instructions on spinlocks.
235 */
236 . = ALIGN(8);
237 .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
238 __alt_instructions = .;
239 *(.altinstructions)
240 __alt_instructions_end = .;
241 }
242
243 /*
244 * And here are the replacement instructions. The linker sticks
245 * them as binary blobs. The .altinstructions has enough data to
246 * get the address and the length of them to patch the kernel safely.
247 */
248 .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
249 *(.altinstr_replacement)
250 }
251
252 /*
253 * struct iommu_table_entry entries are injected in this section.
254 * It is an array of IOMMUs which during run time gets sorted depending
255 * on its dependency order. After rootfs_initcall is complete
256 * this section can be safely removed.
257 */
258 .iommu_table : AT(ADDR(.iommu_table) - LOAD_OFFSET) {
259 __iommu_table = .;
260 *(.iommu_table)
261 __iommu_table_end = .;
262 }
263
264 . = ALIGN(8);
265 .apicdrivers : AT(ADDR(.apicdrivers) - LOAD_OFFSET) {
266 __apicdrivers = .;
267 *(.apicdrivers);
268 __apicdrivers_end = .;
269 }
270
271 . = ALIGN(8);
272 /*
273 * .exit.text is discard at runtime, not link time, to deal with
274 * references from .altinstructions and .eh_frame
275 */
276 .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
277 EXIT_TEXT
278 }
279
280 .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
281 EXIT_DATA
282 }
283
284#if !defined(CONFIG_X86_64) || !defined(CONFIG_SMP)
285 PERCPU_SECTION(INTERNODE_CACHE_BYTES)
286#endif
287
288 . = ALIGN(PAGE_SIZE);
289
290 /* freed after init ends here */
291 .init.end : AT(ADDR(.init.end) - LOAD_OFFSET) {
292 __init_end = .;
293 }
294
295 /*
296 * smp_locks might be freed after init
297 * start/end must be page aligned
298 */
299 . = ALIGN(PAGE_SIZE);
300 .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
301 __smp_locks = .;
302 *(.smp_locks)
303 . = ALIGN(PAGE_SIZE);
304 __smp_locks_end = .;
305 }
306
307#ifdef CONFIG_X86_64
308 .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
309 NOSAVE_DATA
310 }
311#endif
312
313 /* BSS */
314 . = ALIGN(PAGE_SIZE);
315 .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
316 __bss_start = .;
317 *(.bss..page_aligned)
318 *(.bss)
319 . = ALIGN(PAGE_SIZE);
320 __bss_stop = .;
321 }
322
323 . = ALIGN(PAGE_SIZE);
324 .brk : AT(ADDR(.brk) - LOAD_OFFSET) {
325 __brk_base = .;
326 . += 64 * 1024; /* 64k alignment slop space */
327 *(.brk_reservation) /* areas brk users have reserved */
328 __brk_limit = .;
329 }
330
331 _end = .;
332
333 STABS_DEBUG
334 DWARF_DEBUG
335
336 /* Sections to be discarded */
337 DISCARDS
338 /DISCARD/ : { *(.eh_frame) }
339}
340
341
342#ifdef CONFIG_X86_32
343/*
344 * The ASSERT() sink to . is intentional, for binutils 2.14 compatibility:
345 */
346. = ASSERT((_end - LOAD_OFFSET <= KERNEL_IMAGE_SIZE),
347 "kernel image bigger than KERNEL_IMAGE_SIZE");
348#else
349/*
350 * Per-cpu symbols which need to be offset from __per_cpu_load
351 * for the boot processor.
352 */
353#define INIT_PER_CPU(x) init_per_cpu__##x = x + __per_cpu_load
354INIT_PER_CPU(gdt_page);
355INIT_PER_CPU(irq_stack_union);
356
357/*
358 * Build-time check on the image size:
359 */
360. = ASSERT((_end - _text <= KERNEL_IMAGE_SIZE),
361 "kernel image bigger than KERNEL_IMAGE_SIZE");
362
363#ifdef CONFIG_SMP
364. = ASSERT((irq_stack_union == 0),
365 "irq_stack_union is not at start of per-cpu area");
366#endif
367
368#endif /* CONFIG_X86_32 */
369
370#ifdef CONFIG_KEXEC
371#include <asm/kexec.h>
372
373. = ASSERT(kexec_control_code_size <= KEXEC_CONTROL_CODE_MAX_SIZE,
374 "kexec control code size is too big");
375#endif
376
1/*
2 * ld script for the x86 kernel
3 *
4 * Historic 32-bit version written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
5 *
6 * Modernisation, unification and other changes and fixes:
7 * Copyright (C) 2007-2009 Sam Ravnborg <sam@ravnborg.org>
8 *
9 *
10 * Don't define absolute symbols until and unless you know that symbol
11 * value is should remain constant even if kernel image is relocated
12 * at run time. Absolute symbols are not relocated. If symbol value should
13 * change if kernel is relocated, make the symbol section relative and
14 * put it inside the section definition.
15 */
16
17#ifdef CONFIG_X86_32
18#define LOAD_OFFSET __PAGE_OFFSET
19#else
20#define LOAD_OFFSET __START_KERNEL_map
21#endif
22
23#include <asm-generic/vmlinux.lds.h>
24#include <asm/asm-offsets.h>
25#include <asm/thread_info.h>
26#include <asm/page_types.h>
27#include <asm/cache.h>
28#include <asm/boot.h>
29
30#undef i386 /* in case the preprocessor is a 32bit one */
31
32OUTPUT_FORMAT(CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT)
33
34#ifdef CONFIG_X86_32
35OUTPUT_ARCH(i386)
36ENTRY(phys_startup_32)
37jiffies = jiffies_64;
38#else
39OUTPUT_ARCH(i386:x86-64)
40ENTRY(phys_startup_64)
41jiffies_64 = jiffies;
42#endif
43
44#if defined(CONFIG_X86_64) && defined(CONFIG_DEBUG_RODATA)
45/*
46 * On 64-bit, align RODATA to 2MB so that even with CONFIG_DEBUG_RODATA
47 * we retain large page mappings for boundaries spanning kernel text, rodata
48 * and data sections.
49 *
50 * However, kernel identity mappings will have different RWX permissions
51 * to the pages mapping to text and to the pages padding (which are freed) the
52 * text section. Hence kernel identity mappings will be broken to smaller
53 * pages. For 64-bit, kernel text and kernel identity mappings are different,
54 * so we can enable protection checks that come with CONFIG_DEBUG_RODATA,
55 * as well as retain 2MB large page mappings for kernel text.
56 */
57#define X64_ALIGN_DEBUG_RODATA_BEGIN . = ALIGN(HPAGE_SIZE);
58
59#define X64_ALIGN_DEBUG_RODATA_END \
60 . = ALIGN(HPAGE_SIZE); \
61 __end_rodata_hpage_align = .;
62
63#else
64
65#define X64_ALIGN_DEBUG_RODATA_BEGIN
66#define X64_ALIGN_DEBUG_RODATA_END
67
68#endif
69
70PHDRS {
71 text PT_LOAD FLAGS(5); /* R_E */
72 data PT_LOAD FLAGS(6); /* RW_ */
73#ifdef CONFIG_X86_64
74#ifdef CONFIG_SMP
75 percpu PT_LOAD FLAGS(6); /* RW_ */
76#endif
77 init PT_LOAD FLAGS(7); /* RWE */
78#endif
79 note PT_NOTE FLAGS(0); /* ___ */
80}
81
82SECTIONS
83{
84#ifdef CONFIG_X86_32
85 . = LOAD_OFFSET + LOAD_PHYSICAL_ADDR;
86 phys_startup_32 = startup_32 - LOAD_OFFSET;
87#else
88 . = __START_KERNEL;
89 phys_startup_64 = startup_64 - LOAD_OFFSET;
90#endif
91
92 /* Text and read-only data */
93 .text : AT(ADDR(.text) - LOAD_OFFSET) {
94 _text = .;
95 /* bootstrapping code */
96 HEAD_TEXT
97 . = ALIGN(8);
98 _stext = .;
99 TEXT_TEXT
100 SCHED_TEXT
101 LOCK_TEXT
102 KPROBES_TEXT
103 ENTRY_TEXT
104 IRQENTRY_TEXT
105 *(.fixup)
106 *(.gnu.warning)
107 /* End of text section */
108 _etext = .;
109 } :text = 0x9090
110
111 NOTES :text :note
112
113 EXCEPTION_TABLE(16) :text = 0x9090
114
115#if defined(CONFIG_DEBUG_RODATA)
116 /* .text should occupy whole number of pages */
117 . = ALIGN(PAGE_SIZE);
118#endif
119 X64_ALIGN_DEBUG_RODATA_BEGIN
120 RO_DATA(PAGE_SIZE)
121 X64_ALIGN_DEBUG_RODATA_END
122
123 /* Data */
124 .data : AT(ADDR(.data) - LOAD_OFFSET) {
125 /* Start of data section */
126 _sdata = .;
127
128 /* init_task */
129 INIT_TASK_DATA(THREAD_SIZE)
130
131#ifdef CONFIG_X86_32
132 /* 32 bit has nosave before _edata */
133 NOSAVE_DATA
134#endif
135
136 PAGE_ALIGNED_DATA(PAGE_SIZE)
137
138 CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
139
140 DATA_DATA
141 CONSTRUCTORS
142
143 /* rarely changed data like cpu maps */
144 READ_MOSTLY_DATA(INTERNODE_CACHE_BYTES)
145
146 /* End of data section */
147 _edata = .;
148 } :data
149
150
151 . = ALIGN(PAGE_SIZE);
152 __vvar_page = .;
153
154 .vvar : AT(ADDR(.vvar) - LOAD_OFFSET) {
155 /* work around gold bug 13023 */
156 __vvar_beginning_hack = .;
157
158 /* Place all vvars at the offsets in asm/vvar.h. */
159#define EMIT_VVAR(name, offset) \
160 . = __vvar_beginning_hack + offset; \
161 *(.vvar_ ## name)
162#define __VVAR_KERNEL_LDS
163#include <asm/vvar.h>
164#undef __VVAR_KERNEL_LDS
165#undef EMIT_VVAR
166
167 /*
168 * Pad the rest of the page with zeros. Otherwise the loader
169 * can leave garbage here.
170 */
171 . = __vvar_beginning_hack + PAGE_SIZE;
172 } :data
173
174 . = ALIGN(__vvar_page + PAGE_SIZE, PAGE_SIZE);
175
176 /* Init code and data - will be freed after init */
177 . = ALIGN(PAGE_SIZE);
178 .init.begin : AT(ADDR(.init.begin) - LOAD_OFFSET) {
179 __init_begin = .; /* paired with __init_end */
180 }
181
182#if defined(CONFIG_X86_64) && defined(CONFIG_SMP)
183 /*
184 * percpu offsets are zero-based on SMP. PERCPU_VADDR() changes the
185 * output PHDR, so the next output section - .init.text - should
186 * start another segment - init.
187 */
188 PERCPU_VADDR(INTERNODE_CACHE_BYTES, 0, :percpu)
189#endif
190
191 INIT_TEXT_SECTION(PAGE_SIZE)
192#ifdef CONFIG_X86_64
193 :init
194#endif
195
196 INIT_DATA_SECTION(16)
197
198 .x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
199 __x86_cpu_dev_start = .;
200 *(.x86_cpu_dev.init)
201 __x86_cpu_dev_end = .;
202 }
203
204#ifdef CONFIG_X86_INTEL_MID
205 .x86_intel_mid_dev.init : AT(ADDR(.x86_intel_mid_dev.init) - \
206 LOAD_OFFSET) {
207 __x86_intel_mid_dev_start = .;
208 *(.x86_intel_mid_dev.init)
209 __x86_intel_mid_dev_end = .;
210 }
211#endif
212
213 /*
214 * start address and size of operations which during runtime
215 * can be patched with virtualization friendly instructions or
216 * baremetal native ones. Think page table operations.
217 * Details in paravirt_types.h
218 */
219 . = ALIGN(8);
220 .parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
221 __parainstructions = .;
222 *(.parainstructions)
223 __parainstructions_end = .;
224 }
225
226 /*
227 * struct alt_inst entries. From the header (alternative.h):
228 * "Alternative instructions for different CPU types or capabilities"
229 * Think locking instructions on spinlocks.
230 */
231 . = ALIGN(8);
232 .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
233 __alt_instructions = .;
234 *(.altinstructions)
235 __alt_instructions_end = .;
236 }
237
238 /*
239 * And here are the replacement instructions. The linker sticks
240 * them as binary blobs. The .altinstructions has enough data to
241 * get the address and the length of them to patch the kernel safely.
242 */
243 .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
244 *(.altinstr_replacement)
245 }
246
247 /*
248 * struct iommu_table_entry entries are injected in this section.
249 * It is an array of IOMMUs which during run time gets sorted depending
250 * on its dependency order. After rootfs_initcall is complete
251 * this section can be safely removed.
252 */
253 .iommu_table : AT(ADDR(.iommu_table) - LOAD_OFFSET) {
254 __iommu_table = .;
255 *(.iommu_table)
256 __iommu_table_end = .;
257 }
258
259 . = ALIGN(8);
260 .apicdrivers : AT(ADDR(.apicdrivers) - LOAD_OFFSET) {
261 __apicdrivers = .;
262 *(.apicdrivers);
263 __apicdrivers_end = .;
264 }
265
266 . = ALIGN(8);
267 /*
268 * .exit.text is discard at runtime, not link time, to deal with
269 * references from .altinstructions and .eh_frame
270 */
271 .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
272 EXIT_TEXT
273 }
274
275 .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
276 EXIT_DATA
277 }
278
279#if !defined(CONFIG_X86_64) || !defined(CONFIG_SMP)
280 PERCPU_SECTION(INTERNODE_CACHE_BYTES)
281#endif
282
283 . = ALIGN(PAGE_SIZE);
284
285 /* freed after init ends here */
286 .init.end : AT(ADDR(.init.end) - LOAD_OFFSET) {
287 __init_end = .;
288 }
289
290 /*
291 * smp_locks might be freed after init
292 * start/end must be page aligned
293 */
294 . = ALIGN(PAGE_SIZE);
295 .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
296 __smp_locks = .;
297 *(.smp_locks)
298 . = ALIGN(PAGE_SIZE);
299 __smp_locks_end = .;
300 }
301
302#ifdef CONFIG_X86_64
303 .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
304 NOSAVE_DATA
305 }
306#endif
307
308 /* BSS */
309 . = ALIGN(PAGE_SIZE);
310 .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
311 __bss_start = .;
312 *(.bss..page_aligned)
313 *(.bss)
314 . = ALIGN(PAGE_SIZE);
315 __bss_stop = .;
316 }
317
318 . = ALIGN(PAGE_SIZE);
319 .brk : AT(ADDR(.brk) - LOAD_OFFSET) {
320 __brk_base = .;
321 . += 64 * 1024; /* 64k alignment slop space */
322 *(.brk_reservation) /* areas brk users have reserved */
323 __brk_limit = .;
324 }
325
326 _end = .;
327
328 STABS_DEBUG
329 DWARF_DEBUG
330
331 /* Sections to be discarded */
332 DISCARDS
333 /DISCARD/ : { *(.eh_frame) }
334}
335
336
337#ifdef CONFIG_X86_32
338/*
339 * The ASSERT() sink to . is intentional, for binutils 2.14 compatibility:
340 */
341. = ASSERT((_end - LOAD_OFFSET <= KERNEL_IMAGE_SIZE),
342 "kernel image bigger than KERNEL_IMAGE_SIZE");
343#else
344/*
345 * Per-cpu symbols which need to be offset from __per_cpu_load
346 * for the boot processor.
347 */
348#define INIT_PER_CPU(x) init_per_cpu__##x = x + __per_cpu_load
349INIT_PER_CPU(gdt_page);
350INIT_PER_CPU(irq_stack_union);
351
352/*
353 * Build-time check on the image size:
354 */
355. = ASSERT((_end - _text <= KERNEL_IMAGE_SIZE),
356 "kernel image bigger than KERNEL_IMAGE_SIZE");
357
358#ifdef CONFIG_SMP
359. = ASSERT((irq_stack_union == 0),
360 "irq_stack_union is not at start of per-cpu area");
361#endif
362
363#endif /* CONFIG_X86_32 */
364
365#ifdef CONFIG_KEXEC
366#include <asm/kexec.h>
367
368. = ASSERT(kexec_control_code_size <= KEXEC_CONTROL_CODE_MAX_SIZE,
369 "kexec control code size is too big");
370#endif
371