1/* SPDX-License-Identifier: GPL-2.0 */
2/* ld script to make ARM Linux kernel
3 * taken from the i386 version by Russell King
4 * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
5 */
6
7/* No __ro_after_init data in the .rodata section - which will always be ro */
8#define RO_AFTER_INIT_DATA
9
10#include <linux/sizes.h>
11
12#include <asm-generic/vmlinux.lds.h>
13#include <asm/cache.h>
14#include <asm/thread_info.h>
15#include <asm/memory.h>
16#include <asm/mpu.h>
17#include <asm/page.h>
18
19#include "vmlinux.lds.h"
20
21OUTPUT_ARCH(arm)
22ENTRY(stext)
23
24#ifndef __ARMEB__
25jiffies = jiffies_64;
26#else
27jiffies = jiffies_64 + 4;
28#endif
29
30SECTIONS
31{
32	/*
33	 * XXX: The linker does not define how output sections are
34	 * assigned to input sections when there are multiple statements
35	 * matching the same input section name.  There is no documented
36	 * order of matching.
37	 *
38	 * unwind exit sections must be discarded before the rest of the
39	 * unwind sections get included.
40	 */
41	/DISCARD/ : {
42		ARM_DISCARD
43		*(.alt.smp.init)
44		*(.pv_table)
45	}
46
47	. = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR);
48	_xiprom = .;			/* XIP ROM area to be mapped */
49
50	.head.text : {
51		_text = .;
52		HEAD_TEXT
53	}
54
55	.text : {			/* Real text segment		*/
56		_stext = .;		/* Text and read-only data	*/
57		ARM_TEXT
58	}
59
60	RO_DATA(PAGE_SIZE)
61
62	. = ALIGN(4);
63	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
64		__start___ex_table = .;
65		ARM_MMU_KEEP(*(__ex_table))
66		__stop___ex_table = .;
67	}
68
69#ifdef CONFIG_ARM_UNWIND
70	ARM_UNWIND_SECTIONS
71#endif
72
73	NOTES
74
75	_etext = .;			/* End of text and rodata section */
76
77	ARM_VECTORS
78	INIT_TEXT_SECTION(8)
79	.exit.text : {
80		ARM_EXIT_KEEP(EXIT_TEXT)
81	}
82	.init.proc.info : {
83		ARM_CPU_DISCARD(PROC_INFO)
84	}
85	.init.arch.info : {
86		__arch_info_begin = .;
87		*(.arch.info.init)
88		__arch_info_end = .;
89	}
90	.init.tagtable : {
91		__tagtable_begin = .;
92		*(.taglist.init)
93		__tagtable_end = .;
94	}
95	.init.rodata : {
96		INIT_SETUP(16)
97		INIT_CALLS
98		CON_INITCALL
99		INIT_RAM_FS
100	}
101
102#ifdef CONFIG_ARM_MPU
103	. = ALIGN(SZ_128K);
104#endif
105	_exiprom = .;			/* End of XIP ROM area */
106
107/*
108 * From this point, stuff is considered writable and will be copied to RAM
109 */
110	__data_loc = ALIGN(4);		/* location in file */
111	. = PAGE_OFFSET + TEXT_OFFSET;	/* location in memory */
112#undef LOAD_OFFSET
113#define LOAD_OFFSET (PAGE_OFFSET + TEXT_OFFSET - __data_loc)
114
115	. = ALIGN(THREAD_SIZE);
116	_sdata = .;
117	RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
118	.data.ro_after_init : AT(ADDR(.data.ro_after_init) - LOAD_OFFSET) {
119		*(.data..ro_after_init)
120	}
121	_edata = .;
122
123	. = ALIGN(PAGE_SIZE);
124	__init_begin = .;
125	.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
126		INIT_DATA
127	}
128	.exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
129		ARM_EXIT_KEEP(EXIT_DATA)
130	}
131#ifdef CONFIG_SMP
132	PERCPU_SECTION(L1_CACHE_BYTES)
133#endif
134
135#ifdef CONFIG_HAVE_TCM
136	ARM_TCM
137#endif
138
139	/*
140	 * End of copied data. We need a dummy section to get its LMA.
141	 * Also located before final ALIGN() as trailing padding is not stored
142	 * in the resulting binary file and useless to copy.
143	 */
144	.data.endmark : AT(ADDR(.data.endmark) - LOAD_OFFSET) { }
145	_edata_loc = LOADADDR(.data.endmark);
146
147	. = ALIGN(PAGE_SIZE);
148	__init_end = .;
149
150	BSS_SECTION(0, 0, 8)
151#ifdef CONFIG_ARM_MPU
152	. = ALIGN(PMSAv8_MINALIGN);
153#endif
154	_end = .;
155
156	STABS_DEBUG
157}
158
159/*
160 * These must never be empty
161 * If you have to comment these two assert statements out, your
162 * binutils is too old (for other reasons as well)
163 */
164ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
165ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")
166
167/*
168 * The HYP init code can't be more than a page long,
169 * and should not cross a page boundary.
170 * The above comment applies as well.
171 */
172ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & PAGE_MASK) <= PAGE_SIZE,
173	"HYP init code too big or misaligned")
174
175#ifdef CONFIG_XIP_DEFLATED_DATA
176/*
177 * The .bss is used as a stack area for __inflate_kernel_data() whose stack
178 * frame is 9568 bytes. Make sure it has extra room left.
179 */
180ASSERT((_end - __bss_start) >= 12288, ".bss too small for CONFIG_XIP_DEFLATED_DATA")
181#endif
182
183#ifdef CONFIG_ARM_MPU
184/*
185 * Due to PMSAv7 restriction on base address and size we have to
186 * enforce minimal alignment restrictions. It was seen that weaker
187 * alignment restriction on _xiprom will likely force XIP address
188 * space spawns multiple MPU regions thus it is likely we run in
189 * situation when we are reprogramming MPU region we run on with
190 * something which doesn't cover reprogramming code itself, so as soon
191 * as we update MPU settings we'd immediately try to execute straight
192 * from background region which is XN.
193 * It seem that alignment in 1M should suit most users.
194 * _exiprom is aligned as 1/8 of 1M so can be covered by subregion
195 * disable
196 */
197ASSERT(!(_xiprom & (SZ_1M - 1)), "XIP start address may cause MPU programming issues")
198ASSERT(!(_exiprom & (SZ_128K - 1)), "XIP end address may cause MPU programming issues")
199#endif
200