xref: /linux/arch/powerpc/kernel/vmlinux.lds.S (revision 140eb5227767c6754742020a16d2691222b9c19b) 
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifdef CONFIG_PPC64
3#define PROVIDE32(x)	PROVIDE(__unused__##x)
4#else
5#define PROVIDE32(x)	PROVIDE(x)
6#endif
7#include <asm/page.h>
8#include <asm-generic/vmlinux.lds.h>
9#include <asm/cache.h>
10#include <asm/thread_info.h>
11
12#if defined(CONFIG_STRICT_KERNEL_RWX) && !defined(CONFIG_PPC32)
13#define STRICT_ALIGN_SIZE	(1 << 24)
14#else
15#define STRICT_ALIGN_SIZE	PAGE_SIZE
16#endif
17
18ENTRY(_stext)
19
20PHDRS {
21	kernel PT_LOAD FLAGS(7); /* RWX */
22	notes PT_NOTE FLAGS(0);
23	dummy PT_NOTE FLAGS(0);
24
25	/* binutils < 2.18 has a bug that makes it misbehave when taking an
26	   ELF file with all segments at load address 0 as input.  This
27	   happens when running "strip" on vmlinux, because of the AT() magic
28	   in this linker script.  People using GCC >= 4.2 won't run into
29	   this problem, because the "build-id" support will put some data
30	   into the "notes" segment (at a non-zero load address).
31
32	   To work around this, we force some data into both the "dummy"
33	   segment and the kernel segment, so the dummy segment will get a
34	   non-zero load address.  It's not enough to always create the
35	   "notes" segment, since if nothing gets assigned to it, its load
36	   address will be zero.  */
37}
38
39#ifdef CONFIG_PPC64
40OUTPUT_ARCH(powerpc:common64)
41jiffies = jiffies_64;
42#else
43OUTPUT_ARCH(powerpc:common)
44jiffies = jiffies_64 + 4;
45#endif
46SECTIONS
47{
48	. = KERNELBASE;
49
50/*
51 * Text, read only data and other permanent read-only sections
52 */
53
54	_text = .;
55	_stext = .;
56
57	/*
58	 * Head text.
59	 * This needs to be in its own output section to avoid ld placing
60	 * branch trampoline stubs randomly throughout the fixed sections,
61	 * which it will do (even if the branch comes from another section)
62	 * in order to optimize stub generation.
63	 */
64	.head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {
65#ifdef CONFIG_PPC64
66		KEEP(*(.head.text.first_256B));
67#ifdef CONFIG_PPC_BOOK3E
68#else
69		KEEP(*(.head.text.real_vectors));
70		*(.head.text.real_trampolines);
71		KEEP(*(.head.text.virt_vectors));
72		*(.head.text.virt_trampolines);
73# if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
74		KEEP(*(.head.data.fwnmi_page));
75# endif
76#endif
77#else /* !CONFIG_PPC64 */
78		HEAD_TEXT
79#endif
80	} :kernel
81
82	__head_end = .;
83
84#ifdef CONFIG_PPC64
85	/*
86	 * BLOCK(0) overrides the default output section alignment because
87	 * this needs to start right after .head.text in order for fixed
88	 * section placement to work.
89	 */
90	.text BLOCK(0) : AT(ADDR(.text) - LOAD_OFFSET) {
91#ifdef CONFIG_LD_HEAD_STUB_CATCH
92		*(.linker_stub_catch);
93		. = . ;
94#endif
95
96#else
97	.text : AT(ADDR(.text) - LOAD_OFFSET) {
98		ALIGN_FUNCTION();
99#endif
100		/* careful! __ftr_alt_* sections need to be close to .text */
101		*(.text.hot .text .text.fixup .text.unlikely .fixup __ftr_alt_* .ref.text);
102		SCHED_TEXT
103		CPUIDLE_TEXT
104		LOCK_TEXT
105		KPROBES_TEXT
106		IRQENTRY_TEXT
107		SOFTIRQENTRY_TEXT
108		/*
109		 * -Os builds call FP save/restore functions. The powerpc64
110		 * linker generates those on demand in the .sfpr section.
111		 * .sfpr gets placed at the beginning of a group of input
112		 * sections, which can break start-of-text offset if it is
113		 * included with the main text sections, so put it by itself.
114		 */
115		*(.sfpr);
116		MEM_KEEP(init.text)
117		MEM_KEEP(exit.text)
118
119#ifdef CONFIG_PPC32
120		*(.got1)
121		__got2_start = .;
122		*(.got2)
123		__got2_end = .;
124#endif /* CONFIG_PPC32 */
125
126	} :kernel
127
128	. = ALIGN(PAGE_SIZE);
129	_etext = .;
130	PROVIDE32 (etext = .);
131
132	/* Read-only data */
133	RO_DATA(PAGE_SIZE)
134
135#ifdef CONFIG_PPC64
136	. = ALIGN(8);
137	__rfi_flush_fixup : AT(ADDR(__rfi_flush_fixup) - LOAD_OFFSET) {
138		__start___rfi_flush_fixup = .;
139		*(__rfi_flush_fixup)
140		__stop___rfi_flush_fixup = .;
141	}
142#endif
143
144	EXCEPTION_TABLE(0)
145
146	NOTES :kernel :notes
147
148	/* The dummy segment contents for the bug workaround mentioned above
149	   near PHDRS.  */
150	.dummy : AT(ADDR(.dummy) - LOAD_OFFSET) {
151		LONG(0)
152		LONG(0)
153		LONG(0)
154	} :kernel :dummy
155
156/*
157 * Init sections discarded at runtime
158 */
159	. = ALIGN(STRICT_ALIGN_SIZE);
160	__init_begin = .;
161	INIT_TEXT_SECTION(PAGE_SIZE) :kernel
162
163	/* .exit.text is discarded at runtime, not link time,
164	 * to deal with references from __bug_table
165	 */
166	.exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
167		EXIT_TEXT
168	}
169
170	.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
171		INIT_DATA
172		__vtop_table_begin = .;
173		*(.vtop_fixup);
174		__vtop_table_end = .;
175		__ptov_table_begin = .;
176		*(.ptov_fixup);
177		__ptov_table_end = .;
178	}
179
180	.init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
181		INIT_SETUP(16)
182	}
183
184	.initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
185		INIT_CALLS
186	}
187
188	.con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
189		CON_INITCALL
190	}
191
192	SECURITY_INIT
193
194	. = ALIGN(8);
195	__ftr_fixup : AT(ADDR(__ftr_fixup) - LOAD_OFFSET) {
196		__start___ftr_fixup = .;
197		*(__ftr_fixup)
198		__stop___ftr_fixup = .;
199	}
200	. = ALIGN(8);
201	__mmu_ftr_fixup : AT(ADDR(__mmu_ftr_fixup) - LOAD_OFFSET) {
202		__start___mmu_ftr_fixup = .;
203		*(__mmu_ftr_fixup)
204		__stop___mmu_ftr_fixup = .;
205	}
206	. = ALIGN(8);
207	__lwsync_fixup : AT(ADDR(__lwsync_fixup) - LOAD_OFFSET) {
208		__start___lwsync_fixup = .;
209		*(__lwsync_fixup)
210		__stop___lwsync_fixup = .;
211	}
212#ifdef CONFIG_PPC64
213	. = ALIGN(8);
214	__fw_ftr_fixup : AT(ADDR(__fw_ftr_fixup) - LOAD_OFFSET) {
215		__start___fw_ftr_fixup = .;
216		*(__fw_ftr_fixup)
217		__stop___fw_ftr_fixup = .;
218	}
219#endif
220	.init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
221		INIT_RAM_FS
222	}
223
224	PERCPU_SECTION(L1_CACHE_BYTES)
225
226	. = ALIGN(8);
227	.machine.desc : AT(ADDR(.machine.desc) - LOAD_OFFSET) {
228		__machine_desc_start = . ;
229		*(.machine.desc)
230		__machine_desc_end = . ;
231	}
232#ifdef CONFIG_RELOCATABLE
233	. = ALIGN(8);
234	.dynsym : AT(ADDR(.dynsym) - LOAD_OFFSET)
235	{
236#ifdef CONFIG_PPC32
237		__dynamic_symtab = .;
238#endif
239		*(.dynsym)
240	}
241	.dynstr : AT(ADDR(.dynstr) - LOAD_OFFSET) { *(.dynstr) }
242	.dynamic : AT(ADDR(.dynamic) - LOAD_OFFSET)
243	{
244		__dynamic_start = .;
245		*(.dynamic)
246	}
247	.hash : AT(ADDR(.hash) - LOAD_OFFSET) { *(.hash) }
248	.interp : AT(ADDR(.interp) - LOAD_OFFSET) { *(.interp) }
249	.rela.dyn : AT(ADDR(.rela.dyn) - LOAD_OFFSET)
250	{
251		__rela_dyn_start = .;
252		*(.rela*)
253	}
254#endif
255	/* .exit.data is discarded at runtime, not link time,
256	 * to deal with references from .exit.text
257	 */
258	.exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
259		EXIT_DATA
260	}
261
262	/* freed after init ends here */
263	. = ALIGN(PAGE_SIZE);
264	__init_end = .;
265
266/*
267 * And now the various read/write data
268 */
269
270	. = ALIGN(PAGE_SIZE);
271	_sdata = .;
272
273#ifdef CONFIG_PPC32
274	.data : AT(ADDR(.data) - LOAD_OFFSET) {
275		DATA_DATA
276		*(.sdata)
277		*(.sdata2)
278		*(.got.plt) *(.got)
279		*(.plt)
280	}
281#else
282	.data : AT(ADDR(.data) - LOAD_OFFSET) {
283		DATA_DATA
284		*(.data.rel*)
285		*(.toc1)
286		*(.branch_lt)
287	}
288
289	.opd : AT(ADDR(.opd) - LOAD_OFFSET) {
290		*(.opd)
291	}
292
293	. = ALIGN(256);
294	.got : AT(ADDR(.got) - LOAD_OFFSET) {
295		__toc_start = .;
296#ifndef CONFIG_RELOCATABLE
297		__prom_init_toc_start = .;
298		arch/powerpc/kernel/prom_init.o*(.toc .got)
299		__prom_init_toc_end = .;
300#endif
301		*(.got)
302		*(.toc)
303	}
304#endif
305
306	/* The initial task and kernel stack */
307	INIT_TASK_DATA_SECTION(THREAD_SIZE)
308
309	.data..page_aligned : AT(ADDR(.data..page_aligned) - LOAD_OFFSET) {
310		PAGE_ALIGNED_DATA(PAGE_SIZE)
311	}
312
313	.data..cacheline_aligned : AT(ADDR(.data..cacheline_aligned) - LOAD_OFFSET) {
314		CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
315	}
316
317	.data..read_mostly : AT(ADDR(.data..read_mostly) - LOAD_OFFSET) {
318		READ_MOSTLY_DATA(L1_CACHE_BYTES)
319	}
320
321	. = ALIGN(PAGE_SIZE);
322	.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
323		NOSAVE_DATA
324	}
325
326	BUG_TABLE
327
328	. = ALIGN(PAGE_SIZE);
329	_edata  =  .;
330	PROVIDE32 (edata = .);
331
332/*
333 * And finally the bss
334 */
335
336	BSS_SECTION(0, 0, 0)
337
338	. = ALIGN(PAGE_SIZE);
339	_end = . ;
340	PROVIDE32 (end = .);
341
342	STABS_DEBUG
343
344	DWARF_DEBUG
345
346	DISCARDS
347	/DISCARD/ : {
348		*(*.EMB.apuinfo)
349		*(.glink .iplt .plt .rela* .comment)
350		*(.gnu.version*)
351		*(.gnu.attributes)
352		*(.eh_frame)
353	}
354}
355