Linux kernel & device driver programming

Cross-Referenced Linux and Device Driver Code

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Version: [ 2.6.11.8 ] [ 2.6.25 ] [ 2.6.25.8 ] [ 2.6.31.13 ] Architecture: [ i386 ]
  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(PAGE_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  *      /DISCARD/ : {
 37  *              EXIT_TEXT
 38  *              EXIT_DATA
 39  *              EXIT_CALL
 40  *      }
 41  *      STABS_DEBUG
 42  *      DWARF_DEBUG
 43  * }
 44  *
 45  * [__init_begin, __init_end] is the init section that may be freed after init
 46  * [_stext, _etext] is the text section
 47  * [_sdata, _edata] is the data section
 48  *
 49  * Some of the included output section have their own set of constants.
 50  * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
 51  *               [__nosave_begin, __nosave_end] for the nosave data
 52  */
 53 
 54 #ifndef LOAD_OFFSET
 55 #define LOAD_OFFSET 0
 56 #endif
 57 
 58 #ifndef VMLINUX_SYMBOL
 59 #define VMLINUX_SYMBOL(_sym_) _sym_
 60 #endif
 61 
 62 /* Align . to a 8 byte boundary equals to maximum function alignment. */
 63 #define ALIGN_FUNCTION()  . = ALIGN(8)
 64 
 65 /* The actual configuration determine if the init/exit sections
 66  * are handled as text/data or they can be discarded (which
 67  * often happens at runtime)
 68  */
 69 #ifdef CONFIG_HOTPLUG
 70 #define DEV_KEEP(sec)    *(.dev##sec)
 71 #define DEV_DISCARD(sec)
 72 #else
 73 #define DEV_KEEP(sec)
 74 #define DEV_DISCARD(sec) *(.dev##sec)
 75 #endif
 76 
 77 #ifdef CONFIG_HOTPLUG_CPU
 78 #define CPU_KEEP(sec)    *(.cpu##sec)
 79 #define CPU_DISCARD(sec)
 80 #else
 81 #define CPU_KEEP(sec)
 82 #define CPU_DISCARD(sec) *(.cpu##sec)
 83 #endif
 84 
 85 #if defined(CONFIG_MEMORY_HOTPLUG)
 86 #define MEM_KEEP(sec)    *(.mem##sec)
 87 #define MEM_DISCARD(sec)
 88 #else
 89 #define MEM_KEEP(sec)
 90 #define MEM_DISCARD(sec) *(.mem##sec)
 91 #endif
 92 
 93 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 94 #define MCOUNT_REC()    VMLINUX_SYMBOL(__start_mcount_loc) = .; \
 95                         *(__mcount_loc)                         \
 96                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
 97 #else
 98 #define MCOUNT_REC()
 99 #endif
100 
101 #ifdef CONFIG_TRACE_BRANCH_PROFILING
102 #define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
103                                 *(_ftrace_annotated_branch)                           \
104                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
105 #else
106 #define LIKELY_PROFILE()
107 #endif
108 
109 #ifdef CONFIG_PROFILE_ALL_BRANCHES
110 #define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
111                                 *(_ftrace_branch)                             \
112                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
113 #else
114 #define BRANCH_PROFILE()
115 #endif
116 
117 #ifdef CONFIG_EVENT_TRACING
118 #define FTRACE_EVENTS() VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
119                         *(_ftrace_events)                               \
120                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;
121 #else
122 #define FTRACE_EVENTS()
123 #endif
124 
125 #ifdef CONFIG_TRACING
126 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
127                          *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
128                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
129 #else
130 #define TRACE_PRINTKS()
131 #endif
132 
133 #ifdef CONFIG_FTRACE_SYSCALLS
134 #define TRACE_SYSCALLS() VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
135                          *(__syscalls_metadata)                         \
136                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
137 #else
138 #define TRACE_SYSCALLS()
139 #endif
140 
141 /* .data section */
142 #define DATA_DATA                                                       \
143         *(.data)                                                        \
144         *(.ref.data)                                                    \
145         DEV_KEEP(init.data)                                             \
146         DEV_KEEP(exit.data)                                             \
147         CPU_KEEP(init.data)                                             \
148         CPU_KEEP(exit.data)                                             \
149         MEM_KEEP(init.data)                                             \
150         MEM_KEEP(exit.data)                                             \
151         . = ALIGN(8);                                                   \
152         VMLINUX_SYMBOL(__start___markers) = .;                          \
153         *(__markers)                                                    \
154         VMLINUX_SYMBOL(__stop___markers) = .;                           \
155         . = ALIGN(32);                                                  \
156         VMLINUX_SYMBOL(__start___tracepoints) = .;                      \
157         *(__tracepoints)                                                \
158         VMLINUX_SYMBOL(__stop___tracepoints) = .;                       \
159         /* implement dynamic printk debug */                            \
160         . = ALIGN(8);                                                   \
161         VMLINUX_SYMBOL(__start___verbose) = .;                          \
162         *(__verbose)                                                    \
163         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
164         LIKELY_PROFILE()                                                \
165         BRANCH_PROFILE()                                                \
166         TRACE_PRINTKS()                                                 \
167         FTRACE_EVENTS()                                                 \
168         TRACE_SYSCALLS()
169 
170 /*
171  * Data section helpers
172  */
173 #define NOSAVE_DATA                                                     \
174         . = ALIGN(PAGE_SIZE);                                           \
175         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
176         *(.data.nosave)                                                 \
177         . = ALIGN(PAGE_SIZE);                                           \
178         VMLINUX_SYMBOL(__nosave_end) = .;
179 
180 #define PAGE_ALIGNED_DATA(page_align)                                   \
181         . = ALIGN(page_align);                                          \
182         *(.data.page_aligned)
183 
184 #define READ_MOSTLY_DATA(align)                                         \
185         . = ALIGN(align);                                               \
186         *(.data.read_mostly)
187 
188 #define CACHELINE_ALIGNED_DATA(align)                                   \
189         . = ALIGN(align);                                               \
190         *(.data.cacheline_aligned)
191 
192 #define INIT_TASK_DATA(align)                                           \
193         . = ALIGN(align);                                               \
194         *(.data.init_task)
195 
196 /*
197  * Read only Data
198  */
199 #define RO_DATA_SECTION(align)                                          \
200         . = ALIGN((align));                                             \
201         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
202                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
203                 *(.rodata) *(.rodata.*)                                 \
204                 *(__vermagic)           /* Kernel version magic */      \
205                 *(__markers_strings)    /* Markers: strings */          \
206                 *(__tracepoints_strings)/* Tracepoints: strings */      \
207         }                                                               \
208                                                                         \
209         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
210                 *(.rodata1)                                             \
211         }                                                               \
212                                                                         \
213         BUG_TABLE                                                       \
214                                                                         \
215         /* PCI quirks */                                                \
216         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
217                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
218                 *(.pci_fixup_early)                                     \
219                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
220                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
221                 *(.pci_fixup_header)                                    \
222                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
223                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
224                 *(.pci_fixup_final)                                     \
225                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
226                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
227                 *(.pci_fixup_enable)                                    \
228                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
229                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
230                 *(.pci_fixup_resume)                                    \
231                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
232                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
233                 *(.pci_fixup_resume_early)                              \
234                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
235                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
236                 *(.pci_fixup_suspend)                                   \
237                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
238         }                                                               \
239                                                                         \
240         /* Built-in firmware blobs */                                   \
241         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
242                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
243                 *(.builtin_fw)                                          \
244                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
245         }                                                               \
246                                                                         \
247         /* RapidIO route ops */                                         \
248         .rio_route        : AT(ADDR(.rio_route) - LOAD_OFFSET) {        \
249                 VMLINUX_SYMBOL(__start_rio_route_ops) = .;              \
250                 *(.rio_route_ops)                                       \
251                 VMLINUX_SYMBOL(__end_rio_route_ops) = .;                \
252         }                                                               \
253                                                                         \
254         TRACEDATA                                                       \
255                                                                         \
256         /* Kernel symbol table: Normal symbols */                       \
257         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
258                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
259                 *(__ksymtab)                                            \
260                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
261         }                                                               \
262                                                                         \
263         /* Kernel symbol table: GPL-only symbols */                     \
264         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
265                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
266                 *(__ksymtab_gpl)                                        \
267                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
268         }                                                               \
269                                                                         \
270         /* Kernel symbol table: Normal unused symbols */                \
271         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
272                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
273                 *(__ksymtab_unused)                                     \
274                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
275         }                                                               \
276                                                                         \
277         /* Kernel symbol table: GPL-only unused symbols */              \
278         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
279                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
280                 *(__ksymtab_unused_gpl)                                 \
281                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
282         }                                                               \
283                                                                         \
284         /* Kernel symbol table: GPL-future-only symbols */              \
285         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
286                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
287                 *(__ksymtab_gpl_future)                                 \
288                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
289         }                                                               \
290                                                                         \
291         /* Kernel symbol table: Normal symbols */                       \
292         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
293                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
294                 *(__kcrctab)                                            \
295                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
296         }                                                               \
297                                                                         \
298         /* Kernel symbol table: GPL-only symbols */                     \
299         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
300                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
301                 *(__kcrctab_gpl)                                        \
302                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
303         }                                                               \
304                                                                         \
305         /* Kernel symbol table: Normal unused symbols */                \
306         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
307                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
308                 *(__kcrctab_unused)                                     \
309                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
310         }                                                               \
311                                                                         \
312         /* Kernel symbol table: GPL-only unused symbols */              \
313         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
314                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
315                 *(__kcrctab_unused_gpl)                                 \
316                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
317         }                                                               \
318                                                                         \
319         /* Kernel symbol table: GPL-future-only symbols */              \
320         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
321                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
322                 *(__kcrctab_gpl_future)                                 \
323                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
324         }                                                               \
325                                                                         \
326         /* Kernel symbol table: strings */                              \
327         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
328                 *(__ksymtab_strings)                                    \
329         }                                                               \
330                                                                         \
331         /* __*init sections */                                          \
332         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
333                 *(.ref.rodata)                                          \
334                 MCOUNT_REC()                                            \
335                 DEV_KEEP(init.rodata)                                   \
336                 DEV_KEEP(exit.rodata)                                   \
337                 CPU_KEEP(init.rodata)                                   \
338                 CPU_KEEP(exit.rodata)                                   \
339                 MEM_KEEP(init.rodata)                                   \
340                 MEM_KEEP(exit.rodata)                                   \
341         }                                                               \
342                                                                         \
343         /* Built-in module parameters. */                               \
344         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
345                 VMLINUX_SYMBOL(__start___param) = .;                    \
346                 *(__param)                                              \
347                 VMLINUX_SYMBOL(__stop___param) = .;                     \
348                 . = ALIGN((align));                                     \
349                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
350         }                                                               \
351         . = ALIGN((align));
352 
353 /* RODATA & RO_DATA provided for backward compatibility.
354  * All archs are supposed to use RO_DATA() */
355 #define RODATA          RO_DATA_SECTION(4096)
356 #define RO_DATA(align)  RO_DATA_SECTION(align)
357 
358 #define SECURITY_INIT                                                   \
359         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
360                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
361                 *(.security_initcall.init)                              \
362                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
363         }
364 
365 /* .text section. Map to function alignment to avoid address changes
366  * during second ld run in second ld pass when generating System.map */
367 #define TEXT_TEXT                                                       \
368                 ALIGN_FUNCTION();                                       \
369                 *(.text.hot)                                            \
370                 *(.text)                                                \
371                 *(.ref.text)                                            \
372         DEV_KEEP(init.text)                                             \
373         DEV_KEEP(exit.text)                                             \
374         CPU_KEEP(init.text)                                             \
375         CPU_KEEP(exit.text)                                             \
376         MEM_KEEP(init.text)                                             \
377         MEM_KEEP(exit.text)                                             \
378                 *(.text.unlikely)
379 
380 
381 /* sched.text is aling to function alignment to secure we have same
382  * address even at second ld pass when generating System.map */
383 #define SCHED_TEXT                                                      \
384                 ALIGN_FUNCTION();                                       \
385                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
386                 *(.sched.text)                                          \
387                 VMLINUX_SYMBOL(__sched_text_end) = .;
388 
389 /* spinlock.text is aling to function alignment to secure we have same
390  * address even at second ld pass when generating System.map */
391 #define LOCK_TEXT                                                       \
392                 ALIGN_FUNCTION();                                       \
393                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
394                 *(.spinlock.text)                                       \
395                 VMLINUX_SYMBOL(__lock_text_end) = .;
396 
397 #define KPROBES_TEXT                                                    \
398                 ALIGN_FUNCTION();                                       \
399                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
400                 *(.kprobes.text)                                        \
401                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
402 
403 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
404 #define IRQENTRY_TEXT                                                   \
405                 ALIGN_FUNCTION();                                       \
406                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
407                 *(.irqentry.text)                                       \
408                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
409 #else
410 #define IRQENTRY_TEXT
411 #endif
412 
413 /* Section used for early init (in .S files) */
414 #define HEAD_TEXT  *(.head.text)
415 
416 #define HEAD_TEXT_SECTION                                                       \
417         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
418                 HEAD_TEXT                                               \
419         }
420 
421 /*
422  * Exception table
423  */
424 #define EXCEPTION_TABLE(align)                                          \
425         . = ALIGN(align);                                               \
426         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
427                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
428                 *(__ex_table)                                           \
429                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
430         }
431 
432 /*
433  * Init task
434  */
435 #define INIT_TASK_DATA_SECTION(align)                                   \
436         . = ALIGN(align);                                               \
437         .data.init_task : {                                             \
438                 INIT_TASK_DATA(align)                                   \
439         }
440 
441 #ifdef CONFIG_CONSTRUCTORS
442 #define KERNEL_CTORS()  . = ALIGN(8);                      \
443                         VMLINUX_SYMBOL(__ctors_start) = .; \
444                         *(.ctors)                          \
445                         VMLINUX_SYMBOL(__ctors_end) = .;
446 #else
447 #define KERNEL_CTORS()
448 #endif
449 
450 /* init and exit section handling */
451 #define INIT_DATA                                                       \
452         *(.init.data)                                                   \
453         DEV_DISCARD(init.data)                                          \
454         CPU_DISCARD(init.data)                                          \
455         MEM_DISCARD(init.data)                                          \
456         KERNEL_CTORS()                                                  \
457         *(.init.rodata)                                                 \
458         DEV_DISCARD(init.rodata)                                        \
459         CPU_DISCARD(init.rodata)                                        \
460         MEM_DISCARD(init.rodata)
461 
462 #define INIT_TEXT                                                       \
463         *(.init.text)                                                   \
464         DEV_DISCARD(init.text)                                          \
465         CPU_DISCARD(init.text)                                          \
466         MEM_DISCARD(init.text)
467 
468 #define EXIT_DATA                                                       \
469         *(.exit.data)                                                   \
470         DEV_DISCARD(exit.data)                                          \
471         DEV_DISCARD(exit.rodata)                                        \
472         CPU_DISCARD(exit.data)                                          \
473         CPU_DISCARD(exit.rodata)                                        \
474         MEM_DISCARD(exit.data)                                          \
475         MEM_DISCARD(exit.rodata)
476 
477 #define EXIT_TEXT                                                       \
478         *(.exit.text)                                                   \
479         DEV_DISCARD(exit.text)                                          \
480         CPU_DISCARD(exit.text)                                          \
481         MEM_DISCARD(exit.text)
482 
483 #define EXIT_CALL                                                       \
484         *(.exitcall.exit)
485 
486 /*
487  * bss (Block Started by Symbol) - uninitialized data
488  * zeroed during startup
489  */
490 #define SBSS(sbss_align)                                                \
491         . = ALIGN(sbss_align);                                          \
492         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
493                 *(.sbss)                                                \
494                 *(.scommon)                                             \
495         }
496 
497 #define BSS(bss_align)                                                  \
498         . = ALIGN(bss_align);                                           \
499         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
500                 *(.bss.page_aligned)                                    \
501                 *(.dynbss)                                              \
502                 *(.bss)                                                 \
503                 *(COMMON)                                               \
504         }
505 
506 /*
507  * DWARF debug sections.
508  * Symbols in the DWARF debugging sections are relative to
509  * the beginning of the section so we begin them at 0.
510  */
511 #define DWARF_DEBUG                                                     \
512                 /* DWARF 1 */                                           \
513                 .debug          0 : { *(.debug) }                       \
514                 .line           0 : { *(.line) }                        \
515                 /* GNU DWARF 1 extensions */                            \
516                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
517                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
518                 /* DWARF 1.1 and DWARF 2 */                             \
519                 .debug_aranges  0 : { *(.debug_aranges) }               \
520                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
521                 /* DWARF 2 */                                           \
522                 .debug_info     0 : { *(.debug_info                     \
523                                 .gnu.linkonce.wi.*) }                   \
524                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
525                 .debug_line     0 : { *(.debug_line) }                  \
526                 .debug_frame    0 : { *(.debug_frame) }                 \
527                 .debug_str      0 : { *(.debug_str) }                   \
528                 .debug_loc      0 : { *(.debug_loc) }                   \
529                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
530                 /* SGI/MIPS DWARF 2 extensions */                       \
531                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
532                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
533                 .debug_typenames 0 : { *(.debug_typenames) }            \
534                 .debug_varnames  0 : { *(.debug_varnames) }             \
535 
536                 /* Stabs debugging sections.  */
537 #define STABS_DEBUG                                                     \
538                 .stab 0 : { *(.stab) }                                  \
539                 .stabstr 0 : { *(.stabstr) }                            \
540                 .stab.excl 0 : { *(.stab.excl) }                        \
541                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
542                 .stab.index 0 : { *(.stab.index) }                      \
543                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
544                 .comment 0 : { *(.comment) }
545 
546 #ifdef CONFIG_GENERIC_BUG
547 #define BUG_TABLE                                                       \
548         . = ALIGN(8);                                                   \
549         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
550                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
551                 *(__bug_table)                                          \
552                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
553         }
554 #else
555 #define BUG_TABLE
556 #endif
557 
558 #ifdef CONFIG_PM_TRACE
559 #define TRACEDATA                                                       \
560         . = ALIGN(4);                                                   \
561         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
562                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
563                 *(.tracedata)                                           \
564                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
565         }
566 #else
567 #define TRACEDATA
568 #endif
569 
570 #define NOTES                                                           \
571         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
572                 VMLINUX_SYMBOL(__start_notes) = .;                      \
573                 *(.note.*)                                              \
574                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
575         }
576 
577 #define INIT_SETUP(initsetup_align)                                     \
578                 . = ALIGN(initsetup_align);                             \
579                 VMLINUX_SYMBOL(__setup_start) = .;                      \
580                 *(.init.setup)                                          \
581                 VMLINUX_SYMBOL(__setup_end) = .;
582 
583 #define INITCALLS                                                       \
584         *(.initcallearly.init)                                          \
585         VMLINUX_SYMBOL(__early_initcall_end) = .;                       \
586         *(.initcall0.init)                                              \
587         *(.initcall0s.init)                                             \
588         *(.initcall1.init)                                              \
589         *(.initcall1s.init)                                             \
590         *(.initcall2.init)                                              \
591         *(.initcall2s.init)                                             \
592         *(.initcall3.init)                                              \
593         *(.initcall3s.init)                                             \
594         *(.initcall4.init)                                              \
595         *(.initcall4s.init)                                             \
596         *(.initcall5.init)                                              \
597         *(.initcall5s.init)                                             \
598         *(.initcallrootfs.init)                                         \
599         *(.initcall6.init)                                              \
600         *(.initcall6s.init)                                             \
601         *(.initcall7.init)                                              \
602         *(.initcall7s.init)
603 
604 #define INIT_CALLS                                                      \
605                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
606                 INITCALLS                                               \
607                 VMLINUX_SYMBOL(__initcall_end) = .;
608 
609 #define CON_INITCALL                                                    \
610                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
611                 *(.con_initcall.init)                                   \
612                 VMLINUX_SYMBOL(__con_initcall_end) = .;
613 
614 #define SECURITY_INITCALL                                               \
615                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
616                 *(.security_initcall.init)                              \
617                 VMLINUX_SYMBOL(__security_initcall_end) = .;
618 
619 #ifdef CONFIG_BLK_DEV_INITRD
620 #define INIT_RAM_FS                                                     \
621         . = ALIGN(PAGE_SIZE);                                           \
622         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
623         *(.init.ramfs)                                                  \
624         VMLINUX_SYMBOL(__initramfs_end) = .;
625 #else
626 #define INIT_RAM_FS
627 #endif
628 
629 /**
630  * PERCPU_VADDR - define output section for percpu area
631  * @vaddr: explicit base address (optional)
632  * @phdr: destination PHDR (optional)
633  *
634  * Macro which expands to output section for percpu area.  If @vaddr
635  * is not blank, it specifies explicit base address and all percpu
636  * symbols will be offset from the given address.  If blank, @vaddr
637  * always equals @laddr + LOAD_OFFSET.
638  *
639  * @phdr defines the output PHDR to use if not blank.  Be warned that
640  * output PHDR is sticky.  If @phdr is specified, the next output
641  * section in the linker script will go there too.  @phdr should have
642  * a leading colon.
643  *
644  * Note that this macros defines __per_cpu_load as an absolute symbol.
645  * If there is no need to put the percpu section at a predetermined
646  * address, use PERCPU().
647  */
648 #define PERCPU_VADDR(vaddr, phdr)                                       \
649         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
650         .data.percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)          \
651                                 - LOAD_OFFSET) {                        \
652                 VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
653                 *(.data.percpu.first)                                   \
654                 *(.data.percpu.page_aligned)                            \
655                 *(.data.percpu)                                         \
656                 *(.data.percpu.shared_aligned)                          \
657                 VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
658         } phdr                                                          \
659         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data.percpu);
660 
661 /**
662  * PERCPU - define output section for percpu area, simple version
663  * @align: required alignment
664  *
665  * Align to @align and outputs output section for percpu area.  This
666  * macro doesn't maniuplate @vaddr or @phdr and __per_cpu_load and
667  * __per_cpu_start will be identical.
668  *
669  * This macro is equivalent to ALIGN(align); PERCPU_VADDR( , ) except
670  * that __per_cpu_load is defined as a relative symbol against
671  * .data.percpu which is required for relocatable x86_32
672  * configuration.
673  */
674 #define PERCPU(align)                                                   \
675         . = ALIGN(align);                                               \
676         .data.percpu    : AT(ADDR(.data.percpu) - LOAD_OFFSET) {        \
677                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
678                 VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
679                 *(.data.percpu.first)                                   \
680                 *(.data.percpu.page_aligned)                            \
681                 *(.data.percpu)                                         \
682                 *(.data.percpu.shared_aligned)                          \
683                 VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
684         }
685 
686 
687 /*
688  * Definition of the high level *_SECTION macros
689  * They will fit only a subset of the architectures
690  */
691 
692 
693 /*
694  * Writeable data.
695  * All sections are combined in a single .data section.
696  * The sections following CONSTRUCTORS are arranged so their
697  * typical alignment matches.
698  * A cacheline is typical/always less than a PAGE_SIZE so
699  * the sections that has this restriction (or similar)
700  * is located before the ones requiring PAGE_SIZE alignment.
701  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
702  * matches the requirment of PAGE_ALIGNED_DATA.
703  *
704  * use 0 as page_align if page_aligned data is not used */
705 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
706         . = ALIGN(PAGE_SIZE);                                           \
707         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
708                 INIT_TASK_DATA(inittask)                                \
709                 CACHELINE_ALIGNED_DATA(cacheline)                       \
710                 READ_MOSTLY_DATA(cacheline)                             \
711                 DATA_DATA                                               \
712                 CONSTRUCTORS                                            \
713                 NOSAVE_DATA                                             \
714                 PAGE_ALIGNED_DATA(pagealigned)                          \
715         }
716 
717 #define INIT_TEXT_SECTION(inittext_align)                               \
718         . = ALIGN(inittext_align);                                      \
719         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
720                 VMLINUX_SYMBOL(_sinittext) = .;                         \
721                 INIT_TEXT                                               \
722                 VMLINUX_SYMBOL(_einittext) = .;                         \
723         }
724 
725 #define INIT_DATA_SECTION(initsetup_align)                              \
726         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
727                 INIT_DATA                                               \
728                 INIT_SETUP(initsetup_align)                             \
729                 INIT_CALLS                                              \
730                 CON_INITCALL                                            \
731                 SECURITY_INITCALL                                       \
732                 INIT_RAM_FS                                             \
733         }
734 
735 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
736         . = ALIGN(sbss_align);                                          \
737         VMLINUX_SYMBOL(__bss_start) = .;                                \
738         SBSS(sbss_align)                                                \
739         BSS(bss_align)                                                  \
740         . = ALIGN(stop_align);                                          \
741         VMLINUX_SYMBOL(__bss_stop) = .;
742 
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