Merge tag 'v3.14' into p/abusse/merge_upgrade
[projects/modsched/linux.git] / include / asm-generic / vmlinux.lds.h
1 /*
2  * Helper macros to support writing architecture specific
3  * linker scripts.
4  *
5  * A minimal linker scripts has following content:
6  * [This is a sample, architectures may have special requiriements]
7  *
8  * OUTPUT_FORMAT(...)
9  * OUTPUT_ARCH(...)
10  * ENTRY(...)
11  * SECTIONS
12  * {
13  *      . = START;
14  *      __init_begin = .;
15  *      HEAD_TEXT_SECTION
16  *      INIT_TEXT_SECTION(PAGE_SIZE)
17  *      INIT_DATA_SECTION(...)
18  *      PERCPU_SECTION(CACHELINE_SIZE)
19  *      __init_end = .;
20  *
21  *      _stext = .;
22  *      TEXT_SECTION = 0
23  *      _etext = .;
24  *
25  *      _sdata = .;
26  *      RO_DATA_SECTION(PAGE_SIZE)
27  *      RW_DATA_SECTION(...)
28  *      _edata = .;
29  *
30  *      EXCEPTION_TABLE(...)
31  *      NOTES
32  *
33  *      BSS_SECTION(0, 0, 0)
34  *      _end = .;
35  *
36  *      STABS_DEBUG
37  *      DWARF_DEBUG
38  *
39  *      DISCARDS                // must be the last
40  * }
41  *
42  * [__init_begin, __init_end] is the init section that may be freed after init
43  * [_stext, _etext] is the text section
44  * [_sdata, _edata] is the data section
45  *
46  * Some of the included output section have their own set of constants.
47  * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
48  *               [__nosave_begin, __nosave_end] for the nosave data
49  */
50
51 #ifndef LOAD_OFFSET
52 #define LOAD_OFFSET 0
53 #endif
54
55 #include <linux/export.h>
56
57 /* Align . to a 8 byte boundary equals to maximum function alignment. */
58 #define ALIGN_FUNCTION()  . = ALIGN(8)
59
60 /*
61  * Align to a 32 byte boundary equal to the
62  * alignment gcc 4.5 uses for a struct
63  */
64 #define STRUCT_ALIGNMENT 32
65 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
66
67 /* The actual configuration determine if the init/exit sections
68  * are handled as text/data or they can be discarded (which
69  * often happens at runtime)
70  */
71 #ifdef CONFIG_HOTPLUG_CPU
72 #define CPU_KEEP(sec)    *(.cpu##sec)
73 #define CPU_DISCARD(sec)
74 #else
75 #define CPU_KEEP(sec)
76 #define CPU_DISCARD(sec) *(.cpu##sec)
77 #endif
78
79 #if defined(CONFIG_MEMORY_HOTPLUG)
80 #define MEM_KEEP(sec)    *(.mem##sec)
81 #define MEM_DISCARD(sec)
82 #else
83 #define MEM_KEEP(sec)
84 #define MEM_DISCARD(sec) *(.mem##sec)
85 #endif
86
87 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
88 #define MCOUNT_REC()    . = ALIGN(8);                           \
89                         VMLINUX_SYMBOL(__start_mcount_loc) = .; \
90                         *(__mcount_loc)                         \
91                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
92 #else
93 #define MCOUNT_REC()
94 #endif
95
96 #ifdef CONFIG_TRACE_BRANCH_PROFILING
97 #define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
98                                 *(_ftrace_annotated_branch)                           \
99                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
100 #else
101 #define LIKELY_PROFILE()
102 #endif
103
104 #ifdef CONFIG_PROFILE_ALL_BRANCHES
105 #define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
106                                 *(_ftrace_branch)                             \
107                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
108 #else
109 #define BRANCH_PROFILE()
110 #endif
111
112 #ifdef CONFIG_EVENT_TRACING
113 #define FTRACE_EVENTS() . = ALIGN(8);                                   \
114                         VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
115                         *(_ftrace_events)                               \
116                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;
117 #else
118 #define FTRACE_EVENTS()
119 #endif
120
121 #ifdef CONFIG_TRACING
122 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
123                          *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
124                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
125 #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .;  \
126                          *(__tracepoint_str) /* Trace_printk fmt' pointer */ \
127                          VMLINUX_SYMBOL(__stop___tracepoint_str) = .;
128 #else
129 #define TRACE_PRINTKS()
130 #define TRACEPOINT_STR()
131 #endif
132
133 #ifdef CONFIG_FTRACE_SYSCALLS
134 #define TRACE_SYSCALLS() . = ALIGN(8);                                  \
135                          VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
136                          *(__syscalls_metadata)                         \
137                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
138 #else
139 #define TRACE_SYSCALLS()
140 #endif
141
142 #ifdef CONFIG_CLKSRC_OF
143 #define CLKSRC_OF_TABLES() . = ALIGN(8);                                \
144                            VMLINUX_SYMBOL(__clksrc_of_table) = .;       \
145                            *(__clksrc_of_table)                         \
146                            *(__clksrc_of_table_end)
147 #else
148 #define CLKSRC_OF_TABLES()
149 #endif
150
151 #ifdef CONFIG_IRQCHIP
152 #define IRQCHIP_OF_MATCH_TABLE()                                        \
153         . = ALIGN(8);                                                   \
154         VMLINUX_SYMBOL(__irqchip_begin) = .;                            \
155         *(__irqchip_of_table)                                           \
156         *(__irqchip_of_end)
157 #else
158 #define IRQCHIP_OF_MATCH_TABLE()
159 #endif
160
161 #ifdef CONFIG_COMMON_CLK
162 #define CLK_OF_TABLES() . = ALIGN(8);                           \
163                         VMLINUX_SYMBOL(__clk_of_table) = .;     \
164                         *(__clk_of_table)                       \
165                         *(__clk_of_table_end)
166 #else
167 #define CLK_OF_TABLES()
168 #endif
169
170 #define KERNEL_DTB()                                                    \
171         STRUCT_ALIGN();                                                 \
172         VMLINUX_SYMBOL(__dtb_start) = .;                                \
173         *(.dtb.init.rodata)                                             \
174         VMLINUX_SYMBOL(__dtb_end) = .;
175
176 /* .data section */
177 #define DATA_DATA                                                       \
178         *(.data)                                                        \
179         *(.ref.data)                                                    \
180         *(.data..shared_aligned) /* percpu related */                   \
181         MEM_KEEP(init.data)                                             \
182         MEM_KEEP(exit.data)                                             \
183         *(.data.unlikely)                                               \
184         STRUCT_ALIGN();                                                 \
185         *(__tracepoints)                                                \
186         /* implement dynamic printk debug */                            \
187         . = ALIGN(8);                                                   \
188         VMLINUX_SYMBOL(__start___jump_table) = .;                       \
189         *(__jump_table)                                                 \
190         VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
191         . = ALIGN(8);                                                   \
192         VMLINUX_SYMBOL(__start___verbose) = .;                          \
193         *(__verbose)                                                    \
194         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
195         LIKELY_PROFILE()                                                \
196         BRANCH_PROFILE()                                                \
197         TRACE_PRINTKS()                                                 \
198         TRACEPOINT_STR()
199
200 /*
201  * Data section helpers
202  */
203 #define NOSAVE_DATA                                                     \
204         . = ALIGN(PAGE_SIZE);                                           \
205         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
206         *(.data..nosave)                                                \
207         . = ALIGN(PAGE_SIZE);                                           \
208         VMLINUX_SYMBOL(__nosave_end) = .;
209
210 #define PAGE_ALIGNED_DATA(page_align)                                   \
211         . = ALIGN(page_align);                                          \
212         *(.data..page_aligned)
213
214 #define READ_MOSTLY_DATA(align)                                         \
215         . = ALIGN(align);                                               \
216         *(.data..read_mostly)                                           \
217         . = ALIGN(align);
218
219 #define CACHELINE_ALIGNED_DATA(align)                                   \
220         . = ALIGN(align);                                               \
221         *(.data..cacheline_aligned)
222
223 #define INIT_TASK_DATA(align)                                           \
224         . = ALIGN(align);                                               \
225         *(.data..init_task)
226
227 /*
228  * Read only Data
229  */
230 #define RO_DATA_SECTION(align)                                          \
231         . = ALIGN((align));                                             \
232         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
233                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
234                 *(.rodata) *(.rodata.*)                                 \
235                 *(__vermagic)           /* Kernel version magic */      \
236                 . = ALIGN(8);                                           \
237                 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;         \
238                 *(__tracepoints_ptrs)   /* Tracepoints: pointer array */\
239                 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;          \
240                 *(__tracepoints_strings)/* Tracepoints: strings */      \
241         }                                                               \
242                                                                         \
243         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
244                 *(.rodata1)                                             \
245         }                                                               \
246                                                                         \
247         BUG_TABLE                                                       \
248                                                                         \
249         /* PCI quirks */                                                \
250         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
251                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
252                 *(.pci_fixup_early)                                     \
253                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
254                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
255                 *(.pci_fixup_header)                                    \
256                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
257                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
258                 *(.pci_fixup_final)                                     \
259                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
260                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
261                 *(.pci_fixup_enable)                                    \
262                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
263                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
264                 *(.pci_fixup_resume)                                    \
265                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
266                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
267                 *(.pci_fixup_resume_early)                              \
268                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
269                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
270                 *(.pci_fixup_suspend)                                   \
271                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
272         }                                                               \
273                                                                         \
274         /* Built-in firmware blobs */                                   \
275         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
276                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
277                 *(.builtin_fw)                                          \
278                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
279         }                                                               \
280                                                                         \
281         TRACEDATA                                                       \
282                                                                         \
283         /* Kernel symbol table: Normal symbols */                       \
284         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
285                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
286                 *(SORT(___ksymtab+*))                                   \
287                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
288         }                                                               \
289                                                                         \
290         /* Kernel symbol table: GPL-only symbols */                     \
291         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
292                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
293                 *(SORT(___ksymtab_gpl+*))                               \
294                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
295         }                                                               \
296                                                                         \
297         /* Kernel symbol table: Normal unused symbols */                \
298         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
299                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
300                 *(SORT(___ksymtab_unused+*))                            \
301                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
302         }                                                               \
303                                                                         \
304         /* Kernel symbol table: GPL-only unused symbols */              \
305         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
306                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
307                 *(SORT(___ksymtab_unused_gpl+*))                        \
308                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
309         }                                                               \
310                                                                         \
311         /* Kernel symbol table: GPL-future-only symbols */              \
312         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
313                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
314                 *(SORT(___ksymtab_gpl_future+*))                        \
315                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
316         }                                                               \
317                                                                         \
318         /* Kernel symbol table: Normal symbols */                       \
319         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
320                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
321                 *(SORT(___kcrctab+*))                                   \
322                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
323         }                                                               \
324                                                                         \
325         /* Kernel symbol table: GPL-only symbols */                     \
326         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
327                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
328                 *(SORT(___kcrctab_gpl+*))                               \
329                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
330         }                                                               \
331                                                                         \
332         /* Kernel symbol table: Normal unused symbols */                \
333         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
334                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
335                 *(SORT(___kcrctab_unused+*))                            \
336                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
337         }                                                               \
338                                                                         \
339         /* Kernel symbol table: GPL-only unused symbols */              \
340         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
341                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
342                 *(SORT(___kcrctab_unused_gpl+*))                        \
343                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
344         }                                                               \
345                                                                         \
346         /* Kernel symbol table: GPL-future-only symbols */              \
347         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
348                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
349                 *(SORT(___kcrctab_gpl_future+*))                        \
350                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
351         }                                                               \
352                                                                         \
353         /* Kernel symbol table: strings */                              \
354         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
355                 *(__ksymtab_strings)                                    \
356         }                                                               \
357                                                                         \
358         /* __*init sections */                                          \
359         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
360                 *(.ref.rodata)                                          \
361                 MEM_KEEP(init.rodata)                                   \
362                 MEM_KEEP(exit.rodata)                                   \
363         }                                                               \
364                                                                         \
365         /* Built-in module parameters. */                               \
366         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
367                 VMLINUX_SYMBOL(__start___param) = .;                    \
368                 *(__param)                                              \
369                 VMLINUX_SYMBOL(__stop___param) = .;                     \
370         }                                                               \
371                                                                         \
372         /* Built-in module versions. */                                 \
373         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
374                 VMLINUX_SYMBOL(__start___modver) = .;                   \
375                 *(__modver)                                             \
376                 VMLINUX_SYMBOL(__stop___modver) = .;                    \
377                 . = ALIGN((align));                                     \
378                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
379         }                                                               \
380         . = ALIGN((align));
381
382 /* RODATA & RO_DATA provided for backward compatibility.
383  * All archs are supposed to use RO_DATA() */
384 #define RODATA          RO_DATA_SECTION(4096)
385 #define RO_DATA(align)  RO_DATA_SECTION(align)
386
387 #define SECURITY_INIT                                                   \
388         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
389                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
390                 *(.security_initcall.init)                              \
391                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
392         }
393
394 /* .text section. Map to function alignment to avoid address changes
395  * during second ld run in second ld pass when generating System.map */
396 #define TEXT_TEXT                                                       \
397                 ALIGN_FUNCTION();                                       \
398                 *(.text.hot)                                            \
399                 *(.text)                                                \
400                 *(.ref.text)                                            \
401         MEM_KEEP(init.text)                                             \
402         MEM_KEEP(exit.text)                                             \
403                 *(.text.unlikely)
404
405
406 /* sched.text is aling to function alignment to secure we have same
407  * address even at second ld pass when generating System.map */
408 #define SCHED_TEXT                                                      \
409                 ALIGN_FUNCTION();                                       \
410                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
411                 *(.sched.text)                                          \
412                 VMLINUX_SYMBOL(__sched_text_end) = .;
413
414 /* spinlock.text is aling to function alignment to secure we have same
415  * address even at second ld pass when generating System.map */
416 #define LOCK_TEXT                                                       \
417                 ALIGN_FUNCTION();                                       \
418                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
419                 *(.spinlock.text)                                       \
420                 VMLINUX_SYMBOL(__lock_text_end) = .;
421
422 #define KPROBES_TEXT                                                    \
423                 ALIGN_FUNCTION();                                       \
424                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
425                 *(.kprobes.text)                                        \
426                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
427
428 #define ENTRY_TEXT                                                      \
429                 ALIGN_FUNCTION();                                       \
430                 VMLINUX_SYMBOL(__entry_text_start) = .;                 \
431                 *(.entry.text)                                          \
432                 VMLINUX_SYMBOL(__entry_text_end) = .;
433
434 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
435 #define IRQENTRY_TEXT                                                   \
436                 ALIGN_FUNCTION();                                       \
437                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
438                 *(.irqentry.text)                                       \
439                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
440 #else
441 #define IRQENTRY_TEXT
442 #endif
443
444 /* Section used for early init (in .S files) */
445 #define HEAD_TEXT  *(.head.text)
446
447 #define HEAD_TEXT_SECTION                                                       \
448         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
449                 HEAD_TEXT                                               \
450         }
451
452 /*
453  * Exception table
454  */
455 #define EXCEPTION_TABLE(align)                                          \
456         . = ALIGN(align);                                               \
457         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
458                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
459                 *(__ex_table)                                           \
460                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
461         }
462
463 /*
464  * Init task
465  */
466 #define INIT_TASK_DATA_SECTION(align)                                   \
467         . = ALIGN(align);                                               \
468         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
469                 INIT_TASK_DATA(align)                                   \
470         }
471
472 #ifdef CONFIG_CONSTRUCTORS
473 #define KERNEL_CTORS()  . = ALIGN(8);                      \
474                         VMLINUX_SYMBOL(__ctors_start) = .; \
475                         *(.ctors)                          \
476                         *(.init_array)                     \
477                         VMLINUX_SYMBOL(__ctors_end) = .;
478 #else
479 #define KERNEL_CTORS()
480 #endif
481
482 /* init and exit section handling */
483 #define INIT_DATA                                                       \
484         *(.init.data)                                                   \
485         MEM_DISCARD(init.data)                                          \
486         KERNEL_CTORS()                                                  \
487         MCOUNT_REC()                                                    \
488         *(.init.rodata)                                                 \
489         FTRACE_EVENTS()                                                 \
490         TRACE_SYSCALLS()                                                \
491         MEM_DISCARD(init.rodata)                                        \
492         CLK_OF_TABLES()                                                 \
493         CLKSRC_OF_TABLES()                                              \
494         KERNEL_DTB()                                                    \
495         IRQCHIP_OF_MATCH_TABLE()
496
497 #define INIT_TEXT                                                       \
498         *(.init.text)                                                   \
499         MEM_DISCARD(init.text)
500
501 #define EXIT_DATA                                                       \
502         *(.exit.data)                                                   \
503         MEM_DISCARD(exit.data)                                          \
504         MEM_DISCARD(exit.rodata)
505
506 #define EXIT_TEXT                                                       \
507         *(.exit.text)                                                   \
508         MEM_DISCARD(exit.text)
509
510 #define EXIT_CALL                                                       \
511         *(.exitcall.exit)
512
513 /*
514  * bss (Block Started by Symbol) - uninitialized data
515  * zeroed during startup
516  */
517 #define SBSS(sbss_align)                                                \
518         . = ALIGN(sbss_align);                                          \
519         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
520                 *(.sbss)                                                \
521                 *(.scommon)                                             \
522         }
523
524 /*
525  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
526  * sections to the front of bss.
527  */
528 #ifndef BSS_FIRST_SECTIONS
529 #define BSS_FIRST_SECTIONS
530 #endif
531
532 #define BSS(bss_align)                                                  \
533         . = ALIGN(bss_align);                                           \
534         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
535                 BSS_FIRST_SECTIONS                                      \
536                 *(.bss..page_aligned)                                   \
537                 *(.dynbss)                                              \
538                 *(.bss)                                                 \
539                 *(COMMON)                                               \
540         }
541
542 /*
543  * DWARF debug sections.
544  * Symbols in the DWARF debugging sections are relative to
545  * the beginning of the section so we begin them at 0.
546  */
547 #define DWARF_DEBUG                                                     \
548                 /* DWARF 1 */                                           \
549                 .debug          0 : { *(.debug) }                       \
550                 .line           0 : { *(.line) }                        \
551                 /* GNU DWARF 1 extensions */                            \
552                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
553                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
554                 /* DWARF 1.1 and DWARF 2 */                             \
555                 .debug_aranges  0 : { *(.debug_aranges) }               \
556                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
557                 /* DWARF 2 */                                           \
558                 .debug_info     0 : { *(.debug_info                     \
559                                 .gnu.linkonce.wi.*) }                   \
560                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
561                 .debug_line     0 : { *(.debug_line) }                  \
562                 .debug_frame    0 : { *(.debug_frame) }                 \
563                 .debug_str      0 : { *(.debug_str) }                   \
564                 .debug_loc      0 : { *(.debug_loc) }                   \
565                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
566                 /* SGI/MIPS DWARF 2 extensions */                       \
567                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
568                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
569                 .debug_typenames 0 : { *(.debug_typenames) }            \
570                 .debug_varnames  0 : { *(.debug_varnames) }             \
571
572                 /* Stabs debugging sections.  */
573 #define STABS_DEBUG                                                     \
574                 .stab 0 : { *(.stab) }                                  \
575                 .stabstr 0 : { *(.stabstr) }                            \
576                 .stab.excl 0 : { *(.stab.excl) }                        \
577                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
578                 .stab.index 0 : { *(.stab.index) }                      \
579                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
580                 .comment 0 : { *(.comment) }
581
582 #ifdef CONFIG_GENERIC_BUG
583 #define BUG_TABLE                                                       \
584         . = ALIGN(8);                                                   \
585         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
586                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
587                 *(__bug_table)                                          \
588                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
589         }
590 #else
591 #define BUG_TABLE
592 #endif
593
594 #ifdef CONFIG_PM_TRACE
595 #define TRACEDATA                                                       \
596         . = ALIGN(4);                                                   \
597         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
598                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
599                 *(.tracedata)                                           \
600                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
601         }
602 #else
603 #define TRACEDATA
604 #endif
605
606 #define NOTES                                                           \
607         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
608                 VMLINUX_SYMBOL(__start_notes) = .;                      \
609                 *(.note.*)                                              \
610                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
611         }
612
613 #define INIT_SETUP(initsetup_align)                                     \
614                 . = ALIGN(initsetup_align);                             \
615                 VMLINUX_SYMBOL(__setup_start) = .;                      \
616                 *(.init.setup)                                          \
617                 VMLINUX_SYMBOL(__setup_end) = .;
618
619 #define INIT_CALLS_LEVEL(level)                                         \
620                 VMLINUX_SYMBOL(__initcall##level##_start) = .;          \
621                 *(.initcall##level##.init)                              \
622                 *(.initcall##level##s.init)                             \
623
624 #define INIT_CALLS                                                      \
625                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
626                 *(.initcallearly.init)                                  \
627                 INIT_CALLS_LEVEL(0)                                     \
628                 INIT_CALLS_LEVEL(1)                                     \
629                 INIT_CALLS_LEVEL(2)                                     \
630                 INIT_CALLS_LEVEL(3)                                     \
631                 INIT_CALLS_LEVEL(4)                                     \
632                 INIT_CALLS_LEVEL(5)                                     \
633                 INIT_CALLS_LEVEL(rootfs)                                \
634                 INIT_CALLS_LEVEL(6)                                     \
635                 INIT_CALLS_LEVEL(7)                                     \
636                 VMLINUX_SYMBOL(__initcall_end) = .;
637
638 #define CON_INITCALL                                                    \
639                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
640                 *(.con_initcall.init)                                   \
641                 VMLINUX_SYMBOL(__con_initcall_end) = .;
642
643 #define SECURITY_INITCALL                                               \
644                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
645                 *(.security_initcall.init)                              \
646                 VMLINUX_SYMBOL(__security_initcall_end) = .;
647
648 #ifdef CONFIG_BLK_DEV_INITRD
649 #define INIT_RAM_FS                                                     \
650         . = ALIGN(4);                                                   \
651         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
652         *(.init.ramfs)                                                  \
653         . = ALIGN(8);                                                   \
654         *(.init.ramfs.info)
655 #else
656 #define INIT_RAM_FS
657 #endif
658
659 /*
660  * Default discarded sections.
661  *
662  * Some archs want to discard exit text/data at runtime rather than
663  * link time due to cross-section references such as alt instructions,
664  * bug table, eh_frame, etc.  DISCARDS must be the last of output
665  * section definitions so that such archs put those in earlier section
666  * definitions.
667  */
668 #define DISCARDS                                                        \
669         /DISCARD/ : {                                                   \
670         EXIT_TEXT                                                       \
671         EXIT_DATA                                                       \
672         EXIT_CALL                                                       \
673         *(.discard)                                                     \
674         *(.discard.*)                                                   \
675         }
676
677 /**
678  * PERCPU_INPUT - the percpu input sections
679  * @cacheline: cacheline size
680  *
681  * The core percpu section names and core symbols which do not rely
682  * directly upon load addresses.
683  *
684  * @cacheline is used to align subsections to avoid false cacheline
685  * sharing between subsections for different purposes.
686  */
687 #define PERCPU_INPUT(cacheline)                                         \
688         VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
689         *(.data..percpu..first)                                         \
690         . = ALIGN(PAGE_SIZE);                                           \
691         *(.data..percpu..page_aligned)                                  \
692         . = ALIGN(cacheline);                                           \
693         *(.data..percpu..readmostly)                                    \
694         . = ALIGN(cacheline);                                           \
695         *(.data..percpu)                                                \
696         *(.data..percpu..shared_aligned)                                \
697         VMLINUX_SYMBOL(__per_cpu_end) = .;
698
699 /**
700  * PERCPU_VADDR - define output section for percpu area
701  * @cacheline: cacheline size
702  * @vaddr: explicit base address (optional)
703  * @phdr: destination PHDR (optional)
704  *
705  * Macro which expands to output section for percpu area.
706  *
707  * @cacheline is used to align subsections to avoid false cacheline
708  * sharing between subsections for different purposes.
709  *
710  * If @vaddr is not blank, it specifies explicit base address and all
711  * percpu symbols will be offset from the given address.  If blank,
712  * @vaddr always equals @laddr + LOAD_OFFSET.
713  *
714  * @phdr defines the output PHDR to use if not blank.  Be warned that
715  * output PHDR is sticky.  If @phdr is specified, the next output
716  * section in the linker script will go there too.  @phdr should have
717  * a leading colon.
718  *
719  * Note that this macros defines __per_cpu_load as an absolute symbol.
720  * If there is no need to put the percpu section at a predetermined
721  * address, use PERCPU_SECTION.
722  */
723 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
724         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
725         .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
726                                 - LOAD_OFFSET) {                        \
727                 PERCPU_INPUT(cacheline)                                 \
728         } phdr                                                          \
729         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
730
731 /**
732  * PERCPU_SECTION - define output section for percpu area, simple version
733  * @cacheline: cacheline size
734  *
735  * Align to PAGE_SIZE and outputs output section for percpu area.  This
736  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
737  * __per_cpu_start will be identical.
738  *
739  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
740  * except that __per_cpu_load is defined as a relative symbol against
741  * .data..percpu which is required for relocatable x86_32 configuration.
742  */
743 #define PERCPU_SECTION(cacheline)                                       \
744         . = ALIGN(PAGE_SIZE);                                           \
745         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
746                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
747                 PERCPU_INPUT(cacheline)                                 \
748         }
749
750
751 /*
752  * Definition of the high level *_SECTION macros
753  * They will fit only a subset of the architectures
754  */
755
756
757 /*
758  * Writeable data.
759  * All sections are combined in a single .data section.
760  * The sections following CONSTRUCTORS are arranged so their
761  * typical alignment matches.
762  * A cacheline is typical/always less than a PAGE_SIZE so
763  * the sections that has this restriction (or similar)
764  * is located before the ones requiring PAGE_SIZE alignment.
765  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
766  * matches the requirement of PAGE_ALIGNED_DATA.
767  *
768  * use 0 as page_align if page_aligned data is not used */
769 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
770         . = ALIGN(PAGE_SIZE);                                           \
771         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
772                 INIT_TASK_DATA(inittask)                                \
773                 NOSAVE_DATA                                             \
774                 PAGE_ALIGNED_DATA(pagealigned)                          \
775                 CACHELINE_ALIGNED_DATA(cacheline)                       \
776                 READ_MOSTLY_DATA(cacheline)                             \
777                 DATA_DATA                                               \
778                 CONSTRUCTORS                                            \
779         }
780
781 #define INIT_TEXT_SECTION(inittext_align)                               \
782         . = ALIGN(inittext_align);                                      \
783         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
784                 VMLINUX_SYMBOL(_sinittext) = .;                         \
785                 INIT_TEXT                                               \
786                 VMLINUX_SYMBOL(_einittext) = .;                         \
787         }
788
789 #define INIT_DATA_SECTION(initsetup_align)                              \
790         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
791                 INIT_DATA                                               \
792                 INIT_SETUP(initsetup_align)                             \
793                 INIT_CALLS                                              \
794                 CON_INITCALL                                            \
795                 SECURITY_INITCALL                                       \
796                 INIT_RAM_FS                                             \
797         }
798
799 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
800         . = ALIGN(sbss_align);                                          \
801         VMLINUX_SYMBOL(__bss_start) = .;                                \
802         SBSS(sbss_align)                                                \
803         BSS(bss_align)                                                  \
804         . = ALIGN(stop_align);                                          \
805         VMLINUX_SYMBOL(__bss_stop) = .;