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/page.h>
 17
 18#include "vmlinux.lds.h"
 19
 20OUTPUT_ARCH(arm)
 21ENTRY(stext)
 22
 23#ifndef __ARMEB__
 24jiffies = jiffies_64;
 25#else
 26jiffies = jiffies_64 + 4;
 27#endif
 28
 29SECTIONS
 30{
 31	/*
 32	 * XXX: The linker does not define how output sections are
 33	 * assigned to input sections when there are multiple statements
 34	 * matching the same input section name.  There is no documented
 35	 * order of matching.
 36	 *
 37	 * unwind exit sections must be discarded before the rest of the
 38	 * unwind sections get included.
 39	 */
 40	/DISCARD/ : {
 41		ARM_DISCARD
 42		*(.alt.smp.init)
 43		*(.pv_table)
 44	}
 45
 46	. = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR);
 47	_xiprom = .;			/* XIP ROM area to be mapped */
 48
 49	.head.text : {
 50		_text = .;
 51		HEAD_TEXT
 52	}
 53
 54	.text : {			/* Real text segment		*/
 55		_stext = .;		/* Text and read-only data	*/
 56		ARM_TEXT
 57	}
 58
 59	RO_DATA(PAGE_SIZE)
 60
 61	. = ALIGN(4);
 62	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
 63		__start___ex_table = .;
 64		ARM_MMU_KEEP(*(__ex_table))
 65		__stop___ex_table = .;
 66	}
 67
 68#ifdef CONFIG_ARM_UNWIND
 69	ARM_UNWIND_SECTIONS
 70#endif
 71
 72	NOTES
 73
 74	_etext = .;			/* End of text and rodata section */
 75
 76	ARM_VECTORS
 77	INIT_TEXT_SECTION(8)
 78	.exit.text : {
 79		ARM_EXIT_KEEP(EXIT_TEXT)
 80	}
 81	.init.proc.info : {
 82		ARM_CPU_DISCARD(PROC_INFO)
 83	}
 84	.init.arch.info : {
 85		__arch_info_begin = .;
 86		*(.arch.info.init)
 87		__arch_info_end = .;
 88	}
 89	.init.tagtable : {
 90		__tagtable_begin = .;
 91		*(.taglist.init)
 92		__tagtable_end = .;
 93	}
 94	.init.rodata : {
 95		INIT_SETUP(16)
 96		INIT_CALLS
 97		CON_INITCALL
 98		SECURITY_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	_end = .;
152
153	STABS_DEBUG
154}
155
156/*
157 * These must never be empty
158 * If you have to comment these two assert statements out, your
159 * binutils is too old (for other reasons as well)
160 */
161ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
162ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")
163
164/*
165 * The HYP init code can't be more than a page long,
166 * and should not cross a page boundary.
167 * The above comment applies as well.
168 */
169ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & PAGE_MASK) <= PAGE_SIZE,
170	"HYP init code too big or misaligned")
171
172#ifdef CONFIG_XIP_DEFLATED_DATA
173/*
174 * The .bss is used as a stack area for __inflate_kernel_data() whose stack
175 * frame is 9568 bytes. Make sure it has extra room left.
176 */
177ASSERT((_end - __bss_start) >= 12288, ".bss too small for CONFIG_XIP_DEFLATED_DATA")
178#endif
179
180#ifdef CONFIG_ARM_MPU
181/*
182 * Due to PMSAv7 restriction on base address and size we have to
183 * enforce minimal alignment restrictions. It was seen that weaker
184 * alignment restriction on _xiprom will likely force XIP address
185 * space spawns multiple MPU regions thus it is likely we run in
186 * situation when we are reprogramming MPU region we run on with
187 * something which doesn't cover reprogramming code itself, so as soon
188 * as we update MPU settings we'd immediately try to execute straight
189 * from background region which is XN.
190 * It seem that alignment in 1M should suit most users.
191 * _exiprom is aligned as 1/8 of 1M so can be covered by subregion
192 * disable
193 */
194ASSERT(!(_xiprom & (SZ_1M - 1)), "XIP start address may cause MPU programming issues")
195ASSERT(!(_exiprom & (SZ_128K - 1)), "XIP end address may cause MPU programming issues")
196#endif