summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/vmlinux.lds.S
blob: 434581bcd5b420df3108feb7861eb09ce31914ea (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
/* SPDX-License-Identifier: GPL-2.0 */
#ifdef CONFIG_PPC64
#define PROVIDE32(x)	PROVIDE(__unused__##x)
#else
#define PROVIDE32(x)	PROVIDE(x)
#endif

#define BSS_FIRST_SECTIONS *(.bss.prominit)

#include <asm/page.h>
#include <asm-generic/vmlinux.lds.h>
#include <asm/cache.h>
#include <asm/thread_info.h>

#if defined(CONFIG_STRICT_KERNEL_RWX) && !defined(CONFIG_PPC32)
#define STRICT_ALIGN_SIZE	(1 << 24)
#else
#define STRICT_ALIGN_SIZE	PAGE_SIZE
#endif

ENTRY(_stext)

PHDRS {
	kernel PT_LOAD FLAGS(7); /* RWX */
	notes PT_NOTE FLAGS(0);
	dummy PT_NOTE FLAGS(0);

	/* binutils < 2.18 has a bug that makes it misbehave when taking an
	   ELF file with all segments at load address 0 as input.  This
	   happens when running "strip" on vmlinux, because of the AT() magic
	   in this linker script.  People using GCC >= 4.2 won't run into
	   this problem, because the "build-id" support will put some data
	   into the "notes" segment (at a non-zero load address).

	   To work around this, we force some data into both the "dummy"
	   segment and the kernel segment, so the dummy segment will get a
	   non-zero load address.  It's not enough to always create the
	   "notes" segment, since if nothing gets assigned to it, its load
	   address will be zero.  */
}

#ifdef CONFIG_PPC64
OUTPUT_ARCH(powerpc:common64)
jiffies = jiffies_64;
#else
OUTPUT_ARCH(powerpc:common)
jiffies = jiffies_64 + 4;
#endif
SECTIONS
{
	. = KERNELBASE;

/*
 * Text, read only data and other permanent read-only sections
 */

	_text = .;
	_stext = .;

	/*
	 * Head text.
	 * This needs to be in its own output section to avoid ld placing
	 * branch trampoline stubs randomly throughout the fixed sections,
	 * which it will do (even if the branch comes from another section)
	 * in order to optimize stub generation.
	 */
	.head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {
#ifdef CONFIG_PPC64
		KEEP(*(.head.text.first_256B));
#ifdef CONFIG_PPC_BOOK3E
#else
		KEEP(*(.head.text.real_vectors));
		*(.head.text.real_trampolines);
		KEEP(*(.head.text.virt_vectors));
		*(.head.text.virt_trampolines);
# if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
		KEEP(*(.head.data.fwnmi_page));
# endif
#endif
#else /* !CONFIG_PPC64 */
		HEAD_TEXT
#endif
	} :kernel

	__head_end = .;

#ifdef CONFIG_PPC64
	/*
	 * BLOCK(0) overrides the default output section alignment because
	 * this needs to start right after .head.text in order for fixed
	 * section placement to work.
	 */
	.text BLOCK(0) : AT(ADDR(.text) - LOAD_OFFSET) {
#ifdef CONFIG_LD_HEAD_STUB_CATCH
		KEEP(*(.linker_stub_catch));
		. = . ;
#endif

#else
	.text : AT(ADDR(.text) - LOAD_OFFSET) {
		ALIGN_FUNCTION();
#endif
		/* careful! __ftr_alt_* sections need to be close to .text */
		*(.text.hot TEXT_MAIN .text.fixup .text.unlikely .fixup __ftr_alt_* .ref.text);
#ifdef CONFIG_PPC64
		*(.tramp.ftrace.text);
#endif
		SCHED_TEXT
		CPUIDLE_TEXT
		LOCK_TEXT
		KPROBES_TEXT
		IRQENTRY_TEXT
		SOFTIRQENTRY_TEXT
		/*
		 * -Os builds call FP save/restore functions. The powerpc64
		 * linker generates those on demand in the .sfpr section.
		 * .sfpr gets placed at the beginning of a group of input
		 * sections, which can break start-of-text offset if it is
		 * included with the main text sections, so put it by itself.
		 */
		*(.sfpr);
		MEM_KEEP(init.text)
		MEM_KEEP(exit.text)

#ifdef CONFIG_PPC32
		*(.got1)
		__got2_start = .;
		*(.got2)
		__got2_end = .;
#endif /* CONFIG_PPC32 */

	} :kernel

	. = ALIGN(PAGE_SIZE);
	_etext = .;
	PROVIDE32 (etext = .);

	/* Read-only data */
	RO_DATA(PAGE_SIZE)

#ifdef CONFIG_PPC64
	. = ALIGN(8);
	__stf_entry_barrier_fixup : AT(ADDR(__stf_entry_barrier_fixup) - LOAD_OFFSET) {
		__start___stf_entry_barrier_fixup = .;
		*(__stf_entry_barrier_fixup)
		__stop___stf_entry_barrier_fixup = .;
	}

	. = ALIGN(8);
	__stf_exit_barrier_fixup : AT(ADDR(__stf_exit_barrier_fixup) - LOAD_OFFSET) {
		__start___stf_exit_barrier_fixup = .;
		*(__stf_exit_barrier_fixup)
		__stop___stf_exit_barrier_fixup = .;
	}

	. = ALIGN(8);
	__rfi_flush_fixup : AT(ADDR(__rfi_flush_fixup) - LOAD_OFFSET) {
		__start___rfi_flush_fixup = .;
		*(__rfi_flush_fixup)
		__stop___rfi_flush_fixup = .;
	}
#endif /* CONFIG_PPC64 */

#ifdef CONFIG_PPC_BARRIER_NOSPEC
	. = ALIGN(8);
	__spec_barrier_fixup : AT(ADDR(__spec_barrier_fixup) - LOAD_OFFSET) {
		__start___barrier_nospec_fixup = .;
		*(__barrier_nospec_fixup)
		__stop___barrier_nospec_fixup = .;
	}
#endif /* CONFIG_PPC_BARRIER_NOSPEC */

	EXCEPTION_TABLE(0)

	NOTES :kernel :notes

	/* The dummy segment contents for the bug workaround mentioned above
	   near PHDRS.  */
	.dummy : AT(ADDR(.dummy) - LOAD_OFFSET) {
		LONG(0)
		LONG(0)
		LONG(0)
	} :kernel :dummy

/*
 * Init sections discarded at runtime
 */
	. = ALIGN(STRICT_ALIGN_SIZE);
	__init_begin = .;
	. = ALIGN(PAGE_SIZE);
	.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
		_sinittext = .;
		INIT_TEXT
		_einittext = .;
#ifdef CONFIG_PPC64
		*(.tramp.ftrace.init);
#endif
	} :kernel

	/* .exit.text is discarded at runtime, not link time,
	 * to deal with references from __bug_table
	 */
	.exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
		EXIT_TEXT
	}

	.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
		INIT_DATA
		__vtop_table_begin = .;
		KEEP(*(.vtop_fixup));
		__vtop_table_end = .;
		__ptov_table_begin = .;
		KEEP(*(.ptov_fixup));
		__ptov_table_end = .;
	}

	.init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
		INIT_SETUP(16)
	}

	.initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
		INIT_CALLS
	}

	.con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
		CON_INITCALL
	}

	. = ALIGN(8);
	__ftr_fixup : AT(ADDR(__ftr_fixup) - LOAD_OFFSET) {
		__start___ftr_fixup = .;
		KEEP(*(__ftr_fixup))
		__stop___ftr_fixup = .;
	}
	. = ALIGN(8);
	__mmu_ftr_fixup : AT(ADDR(__mmu_ftr_fixup) - LOAD_OFFSET) {
		__start___mmu_ftr_fixup = .;
		KEEP(*(__mmu_ftr_fixup))
		__stop___mmu_ftr_fixup = .;
	}
	. = ALIGN(8);
	__lwsync_fixup : AT(ADDR(__lwsync_fixup) - LOAD_OFFSET) {
		__start___lwsync_fixup = .;
		KEEP(*(__lwsync_fixup))
		__stop___lwsync_fixup = .;
	}
#ifdef CONFIG_PPC64
	. = ALIGN(8);
	__fw_ftr_fixup : AT(ADDR(__fw_ftr_fixup) - LOAD_OFFSET) {
		__start___fw_ftr_fixup = .;
		KEEP(*(__fw_ftr_fixup))
		__stop___fw_ftr_fixup = .;
	}
#endif
	.init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
		INIT_RAM_FS
	}

	PERCPU_SECTION(L1_CACHE_BYTES)

	. = ALIGN(8);
	.machine.desc : AT(ADDR(.machine.desc) - LOAD_OFFSET) {
		__machine_desc_start = . ;
		KEEP(*(.machine.desc))
		__machine_desc_end = . ;
	}
#ifdef CONFIG_RELOCATABLE
	. = ALIGN(8);
	.dynsym : AT(ADDR(.dynsym) - LOAD_OFFSET)
	{
#ifdef CONFIG_PPC32
		__dynamic_symtab = .;
#endif
		*(.dynsym)
	}
	.dynstr : AT(ADDR(.dynstr) - LOAD_OFFSET) { *(.dynstr) }
	.dynamic : AT(ADDR(.dynamic) - LOAD_OFFSET)
	{
		__dynamic_start = .;
		*(.dynamic)
	}
	.hash : AT(ADDR(.hash) - LOAD_OFFSET) { *(.hash) }
	.interp : AT(ADDR(.interp) - LOAD_OFFSET) { *(.interp) }
	.rela.dyn : AT(ADDR(.rela.dyn) - LOAD_OFFSET)
	{
		__rela_dyn_start = .;
		*(.rela*)
	}
#endif
	/* .exit.data is discarded at runtime, not link time,
	 * to deal with references from .exit.text
	 */
	.exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
		EXIT_DATA
	}

	/* freed after init ends here */
	. = ALIGN(PAGE_SIZE);
	__init_end = .;

/*
 * And now the various read/write data
 */

	. = ALIGN(PAGE_SIZE);
	_sdata = .;

#ifdef CONFIG_PPC32
	.data : AT(ADDR(.data) - LOAD_OFFSET) {
		DATA_DATA
		*(.data.rel*)
		*(SDATA_MAIN)
		*(.sdata2)
		*(.got.plt) *(.got)
		*(.plt)
	}
#else
	.data : AT(ADDR(.data) - LOAD_OFFSET) {
		DATA_DATA
		*(.data.rel*)
		*(.toc1)
		*(.branch_lt)
	}

	.opd : AT(ADDR(.opd) - LOAD_OFFSET) {
		__start_opd = .;
		KEEP(*(.opd))
		__end_opd = .;
	}

	. = ALIGN(256);
	.got : AT(ADDR(.got) - LOAD_OFFSET) {
		__toc_start = .;
#ifndef CONFIG_RELOCATABLE
		__prom_init_toc_start = .;
		arch/powerpc/kernel/prom_init.o*(.toc .got)
		__prom_init_toc_end = .;
#endif
		*(.got)
		*(.toc)
	}
#endif

	/* The initial task and kernel stack */
	INIT_TASK_DATA_SECTION(THREAD_SIZE)

	.data..page_aligned : AT(ADDR(.data..page_aligned) - LOAD_OFFSET) {
		PAGE_ALIGNED_DATA(PAGE_SIZE)
	}

	.data..cacheline_aligned : AT(ADDR(.data..cacheline_aligned) - LOAD_OFFSET) {
		CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
	}

	.data..read_mostly : AT(ADDR(.data..read_mostly) - LOAD_OFFSET) {
		READ_MOSTLY_DATA(L1_CACHE_BYTES)
	}

	. = ALIGN(PAGE_SIZE);
	.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
		NOSAVE_DATA
	}

	BUG_TABLE

	. = ALIGN(PAGE_SIZE);
	_edata  =  .;
	PROVIDE32 (edata = .);

/*
 * And finally the bss
 */

	BSS_SECTION(0, 0, 0)

	. = ALIGN(PAGE_SIZE);
	_end = . ;
	PROVIDE32 (end = .);

	STABS_DEBUG

	DWARF_DEBUG

	DISCARDS
	/DISCARD/ : {
		*(*.EMB.apuinfo)
		*(.glink .iplt .plt .rela* .comment)
		*(.gnu.version*)
		*(.gnu.attributes)
		*(.eh_frame)
	}
}
OpenPOWER on IntegriCloud