xref: /linux/arch/xtensa/kernel/vmlinux.lds.S (revision eb2bce7f5e7ac1ca6da434461217fadf3c688d2c) 
1/*
2 * arch/xtensa/kernel/vmlinux.lds.S
3 *
4 * Xtensa linker script
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License.  See the file "COPYING" in the main directory of this archive
8 * for more details.
9 *
10 * Copyright (C) 2001 - 2005 Tensilica Inc.
11 *
12 * Chris Zankel <chris@zankel.net>
13 * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
14 * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
15 */
16
17#include <asm-generic/vmlinux.lds.h>
18
19#include <asm/variant/core.h>
20OUTPUT_ARCH(xtensa)
21ENTRY(_start)
22
23#ifdef __XTENSA_EB__
24jiffies = jiffies_64 + 4;
25#else
26jiffies = jiffies_64;
27#endif
28
29#define KERNELOFFSET 0xd0001000
30
31/* Note: In the following macros, it would be nice to specify only the
32   vector name and section kind and construct "sym" and "section" using
33   CPP concatenation, but that does not work reliably.  Concatenating a
34   string with "." produces an invalid token.  CPP will not print a
35   warning because it thinks this is an assembly file, but it leaves
36   them as multiple tokens and there may or may not be whitespace
37   between them.  */
38
39/* Macro for a relocation entry */
40
41#define RELOCATE_ENTRY(sym, section)		\
42	LONG(sym ## _start);			\
43	LONG(sym ## _end);			\
44	LONG(LOADADDR(section))
45
46/* Macro to define a section for a vector.
47 *
48 * Use of the MIN function catches the types of errors illustrated in
49 * the following example:
50 *
51 * Assume the section .DoubleExceptionVector.literal is completely
52 * full.  Then a programmer adds code to .DoubleExceptionVector.text
53 * that produces another literal.  The final literal position will
54 * overlay onto the first word of the adjacent code section
55 * .DoubleExceptionVector.text.  (In practice, the literals will
56 * overwrite the code, and the first few instructions will be
57 * garbage.)
58 */
59
60#define SECTION_VECTOR(sym, section, addr, max_prevsec_size, prevsec)       \
61  section addr : AT((MIN(LOADADDR(prevsec) + max_prevsec_size,		    \
62		         LOADADDR(prevsec) + SIZEOF(prevsec)) + 3) & ~ 3)   \
63  {									    \
64    . = ALIGN(4);							    \
65    sym ## _start = ABSOLUTE(.);		 			    \
66    *(section)								    \
67    sym ## _end = ABSOLUTE(.);						    \
68  }
69
70/*
71 *  Mapping of input sections to output sections when linking.
72 */
73
74SECTIONS
75{
76  . = KERNELOFFSET;
77  /* .text section */
78
79  _text = .;
80  _stext = .;
81  _ftext = .;
82
83  .text :
84  {
85    /* The .head.text section must be the first section! */
86    *(.head.text)
87    *(.literal .text)
88    *(.srom.text)
89    VMLINUX_SYMBOL(__sched_text_start) = .;
90    *(.sched.literal .sched.text)
91    VMLINUX_SYMBOL(__sched_text_end) = .;
92    VMLINUX_SYMBOL(__lock_text_start) = .;
93    *(.spinlock.literal .spinlock.text)
94    VMLINUX_SYMBOL(__lock_text_end) = .;
95
96  }
97  _etext = .;
98
99  . = ALIGN(16);
100
101  RODATA
102
103  /*  Relocation table */
104
105  . = ALIGN(16);
106  __boot_reloc_table_start = ABSOLUTE(.);
107
108  __relocate : {
109
110    RELOCATE_ENTRY(_WindowVectors_text,
111		   .WindowVectors.text);
112#if 0
113    RELOCATE_ENTRY(_KernelExceptionVector_literal,
114		   .KernelExceptionVector.literal);
115#endif
116    RELOCATE_ENTRY(_KernelExceptionVector_text,
117		   .KernelExceptionVector.text);
118#if 0
119    RELOCATE_ENTRY(_UserExceptionVector_literal,
120		   .UserExceptionVector.literal);
121#endif
122    RELOCATE_ENTRY(_UserExceptionVector_text,
123		   .UserExceptionVector.text);
124    RELOCATE_ENTRY(_DoubleExceptionVector_literal,
125		   .DoubleExceptionVector.literal);
126    RELOCATE_ENTRY(_DoubleExceptionVector_text,
127		   .DoubleExceptionVector.text);
128  }
129  __boot_reloc_table_end = ABSOLUTE(.) ;
130
131  .fixup   : { *(.fixup) }
132
133  . = ALIGN(16);
134
135  __ex_table : {
136    __start___ex_table = .;
137    *(__ex_table)
138    __stop___ex_table = .;
139  }
140
141  /* Data section */
142
143  . = ALIGN(XCHAL_ICACHE_LINESIZE);
144  _fdata = .;
145  .data :
146  {
147    *(.data) CONSTRUCTORS
148    . = ALIGN(XCHAL_ICACHE_LINESIZE);
149    *(.data.cacheline_aligned)
150  }
151
152  _edata = .;
153
154  /* The initial task */
155  . = ALIGN(8192);
156  .data.init_task : { *(.data.init_task) }
157
158  /* Initialization code and data: */
159
160  . = ALIGN(1 << 12);
161  __init_begin = .;
162  .init.text : {
163  	_sinittext = .;
164	*(.init.literal) *(.init.text)
165	_einittext = .;
166  }
167
168  .init.data :
169  {
170    *(.init.data)
171    . = ALIGN(0x4);
172    __tagtable_begin = .;
173    *(.taglist)
174    __tagtable_end = .;
175  }
176
177  . = ALIGN(XCHAL_ICACHE_LINESIZE);
178
179  __setup_start = .;
180  .init.setup : { *(.init.setup) }
181  __setup_end = .;
182
183  __initcall_start = .;
184  .initcall.init : {
185	INITCALLS
186  }
187  __initcall_end = .;
188
189  __con_initcall_start = .;
190  .con_initcall.init : { *(.con_initcall.init) }
191  __con_initcall_end = .;
192
193  SECURITY_INIT
194
195  . = ALIGN(4);
196
197  __start___ftr_fixup = .;
198  __ftr_fixup : { *(__ftr_fixup) }
199  __stop___ftr_fixup = .;
200
201  . = ALIGN(4096);
202  __per_cpu_start = .;
203  .data.percpu  : { *(.data.percpu) }
204  __per_cpu_end = .;
205
206#ifdef CONFIG_BLK_DEV_INITRD
207  . = ALIGN(4096);
208  __initramfs_start =.;
209  .init.ramfs : { *(.init.ramfs) }
210  __initramfs_end = .;
211#endif
212
213  /* We need this dummy segment here */
214
215  . = ALIGN(4);
216  .dummy : { LONG(0) }
217
218  /* The vectors are relocated to the real position at startup time */
219
220  SECTION_VECTOR (_WindowVectors_text,
221		  .WindowVectors.text,
222		  XCHAL_WINDOW_VECTORS_VADDR, 4,
223		  .dummy)
224  SECTION_VECTOR (_DebugInterruptVector_literal,
225		  .DebugInterruptVector.literal,
226		  XCHAL_DEBUG_VECTOR_VADDR - 4,
227		  SIZEOF(.WindowVectors.text),
228		  .WindowVectors.text)
229  SECTION_VECTOR (_DebugInterruptVector_text,
230		  .DebugInterruptVector.text,
231		  XCHAL_DEBUG_VECTOR_VADDR,
232		  4,
233		  .DebugInterruptVector.literal)
234  SECTION_VECTOR (_KernelExceptionVector_literal,
235		  .KernelExceptionVector.literal,
236		  XCHAL_KERNEL_VECTOR_VADDR - 4,
237		  SIZEOF(.DebugInterruptVector.text),
238		  .DebugInterruptVector.text)
239  SECTION_VECTOR (_KernelExceptionVector_text,
240		  .KernelExceptionVector.text,
241		  XCHAL_KERNEL_VECTOR_VADDR,
242		  4,
243		  .KernelExceptionVector.literal)
244  SECTION_VECTOR (_UserExceptionVector_literal,
245		  .UserExceptionVector.literal,
246		  XCHAL_USER_VECTOR_VADDR - 4,
247		  SIZEOF(.KernelExceptionVector.text),
248		  .KernelExceptionVector.text)
249  SECTION_VECTOR (_UserExceptionVector_text,
250		  .UserExceptionVector.text,
251		  XCHAL_USER_VECTOR_VADDR,
252		  4,
253		  .UserExceptionVector.literal)
254  SECTION_VECTOR (_DoubleExceptionVector_literal,
255		  .DoubleExceptionVector.literal,
256		  XCHAL_DOUBLEEXC_VECTOR_VADDR - 16,
257		  SIZEOF(.UserExceptionVector.text),
258		  .UserExceptionVector.text)
259  SECTION_VECTOR (_DoubleExceptionVector_text,
260		  .DoubleExceptionVector.text,
261		  XCHAL_DOUBLEEXC_VECTOR_VADDR,
262		  32,
263		  .DoubleExceptionVector.literal)
264
265  . = (LOADADDR( .DoubleExceptionVector.text ) + SIZEOF( .DoubleExceptionVector.text ) + 3) & ~ 3;
266  . = ALIGN(1 << 12);
267
268  __init_end = .;
269
270  . = ALIGN(8192);
271
272  /* BSS section */
273  _bss_start = .;
274  .sbss : { *(.sbss) *(.scommon) }
275  .bss : { *(COMMON) *(.bss) }
276  _bss_end = .;
277  _end = .;
278
279  /* only used by the boot loader  */
280
281  . = ALIGN(0x10);
282  .bootstrap : { *(.bootstrap.literal .bootstrap.text .bootstrap.data) }
283
284  . = ALIGN(0x1000);
285  __initrd_start = .;
286  .initrd : { *(.initrd) }
287  __initrd_end = .;
288
289  .ResetVector.text XCHAL_RESET_VECTOR_VADDR :
290  {
291    *(.ResetVector.text)
292  }
293
294
295  /* Sections to be discarded */
296  /DISCARD/ :
297  {
298        *(.text.exit)
299	*(.text.exit.literal)
300        *(.data.exit)
301        *(.exitcall.exit)
302  }
303
304
305  .debug  0 :  { *(.debug) }
306  .line  0 :  { *(.line) }
307  .debug_srcinfo  0 :  { *(.debug_srcinfo) }
308  .debug_sfnames  0 :  { *(.debug_sfnames) }
309  .debug_aranges  0 :  { *(.debug_aranges) }
310  .debug_pubnames  0 :  { *(.debug_pubnames) }
311  .debug_info  0 :  { *(.debug_info) }
312  .debug_abbrev  0 :  { *(.debug_abbrev) }
313  .debug_line  0 :  { *(.debug_line) }
314  .debug_frame  0 :  { *(.debug_frame) }
315  .debug_str  0 :  { *(.debug_str) }
316  .debug_loc  0 :  { *(.debug_loc) }
317  .debug_macinfo  0 :  { *(.debug_macinfo) }
318  .debug_weaknames  0 :  { *(.debug_weaknames) }
319  .debug_funcnames  0 :  { *(.debug_funcnames) }
320  .debug_typenames  0 :  { *(.debug_typenames) }
321  .debug_varnames  0 :  { *(.debug_varnames) }
322
323  .xt.insn 0 :
324  {
325    *(.xt.insn)
326    *(.gnu.linkonce.x*)
327  }
328
329  .xt.lit 0 :
330  {
331    *(.xt.lit)
332    *(.gnu.linkonce.p*)
333  }
334}
335