738bdb95b7
As __start must be placed at a precise location, a separate, explicit input section is needed to guarantee this. Why is this an issue ? NuttX uses --entry=__start which puts __start in its correct location, but out-of-tree builds won't work, so it more robust to use an explicit section for the startup code and enforce its placement in the linker script.
158 lines
3.9 KiB
Plaintext
158 lines
3.9 KiB
Plaintext
/****************************************************************************
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* boards/arm64/imx9/imx93-evk/scripts/dramboot.ld
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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OUTPUT_ARCH(aarch64)
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ENTRY(__start)
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EXTERN(__start)
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/* Memory is organized as follows:
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* - Uboot reserved area is 0x00000000 - 0x00a00000
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* - NuttX is loaded to 0x80000000, u-boot expects us here
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* - NuttX ROM and RAM are one continuous region, starting from 0x80000000
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with a size of 128MB
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* - Heap memory is allocated from dram end to idlestack top
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*/
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MEMORY
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{
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dram (rwx) : ORIGIN = 0x80000000, LENGTH = 128M
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}
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PHDRS
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{
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/* R = 100, W = 010, X = 001 */
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text PT_LOAD FLAGS(5); /* RX */
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rodata PT_LOAD FLAGS(4); /* R */
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data PT_LOAD FLAGS(6); /* RW */
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}
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SECTIONS
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{
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.text :
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{
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_stext = ABSOLUTE(.); /* Text section */
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*(.start .start.*) /* Place __start here */
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*(.text .text.*)
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*(.text.cold)
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*(.text.unlikely)
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*(.fixup)
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*(.gnu.warning)
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} > dram :text
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.init_section :
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{
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_sinit = ABSOLUTE(.);
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KEEP(*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*)))
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KEEP(*(.init_array .ctors))
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_einit = ABSOLUTE(.);
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} > dram :text
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/* Vector table must be page aligned */
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.vector : ALIGN(4096)
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{
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_vector_start = ABSOLUTE(.);
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KEEP(*(.exc_vector_table))
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KEEP(*(".exc_vector_table.*"))
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KEEP(*(.vectors))
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_vector_end = ABSOLUTE(.);
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} > dram :text
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/* End of text data must be aligned to page boundary */
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. = ALIGN(4096);
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_etext = .;
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_sztext = _etext - _stext;
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/* Start of RO data must be page aligned (mapped as read only) */
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.rodata : ALIGN(4096)
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{
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_srodata = ABSOLUTE(.); /* Read-only data */
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*(.rodata .rodata.*)
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*(.data.rel.ro)
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*(.data.rel.ro.*)
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} > dram :rodata
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/* End of RO data must be page aligned */
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. = ALIGN(4096);
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_erodata = .; /* End of read-only data */
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_szrodata = _erodata - _srodata;
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_eronly = .; /* End of read-only data */
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.data : ALIGN(4096)
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{
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_sdata = ABSOLUTE(.);
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*(.data.page_aligned)
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*(.data .data.*)
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. = ALIGN(8);
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*(.data.rel)
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*(.data.rel.*)
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CONSTRUCTORS
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. = ALIGN(8);
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_edata = ABSOLUTE(.);
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} > dram :data
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.bss :
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{
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. = ALIGN(8);
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_sbss = ABSOLUTE(.);
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*(.bss .bss.*)
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. = ALIGN(8);
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_ebss = ABSOLUTE(.);
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} > dram :data
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_szbss = _ebss - _sbss;
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.initstack :
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{
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_s_initstack = ABSOLUTE(.);
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*(.initstack)
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} > dram :data
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/* End of data must be page aligned */
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. = ALIGN(4096);
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g_idle_topstack = .;
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_e_initstack = .;
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_szdata = _e_initstack - _sdata;
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/* Sections to be discarded */
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/DISCARD/ : {
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*(.exit.text)
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*(.exit.data)
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*(.exitcall.exit)
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*(.eh_frame)
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}
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/* Stabs debugging sections. */
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.stab 0 : { *(.stab) }
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.stabstr 0 : { *(.stabstr) }
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.stab.excl 0 : { *(.stab.excl) }
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.stab.exclstr 0 : { *(.stab.exclstr) }
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.stab.index 0 : { *(.stab.index) }
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.stab.indexstr 0 : { *(.stab.indexstr) }
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.comment 0 : { *(.comment) }
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}
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