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sections.ld
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sections.ld
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/*
* Copyright 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Code will start running at this symbol which is placed at the start of the
* image.
*/
ENTRY(entry)
/*
* The following would be useful to check that .init code is not called back
* into once it has completed but it isn't supported by ld.lld.
*
* NOCROSSREFS_TO(.init .text)
*/
SECTIONS
{
.dtb (NOLOAD) : {
dtb_begin = .;
. += LENGTH(dtb_region);
dtb_end = .;
} >dtb_region
/*
* Collect together the code. This is page aligned so it can be mapped
* as executable-only.
*/
.text : ALIGN(4096) {
text_begin = .;
*(.init.entry)
*(.init.*)
*(.text.*)
} >image
text_end = .;
/*
* Collect together read-only data. This is page aligned so it can be
* mapped as read-only and non-executable.
*/
.rodata : ALIGN(4096) {
rodata_begin = .;
*(.rodata.*)
} >image
.got : {
*(.got)
} >image
rodata_end = .;
.eh_stack (NOLOAD) : ALIGN(4096) {
/*
* Get stack overflow guard from the previous page being from
* .rodata and mapped read-only or left unmapped.
*/
eh_stack_limit = .;
. += 4096;
. = ALIGN(4096);
init_eh_stack_pointer = .;
} >writable_data
/*
* Collect together the read-write data including .bss at the end which
* will be zero'd by the entry code. This is page aligned so it can be
* mapped as non-executable.
*/
.data : ALIGN(4096) {
data_begin = .;
*(.data.*)
/*
* The entry point code assumes that .data is a multiple of 32
* bytes long.
*/
. = ALIGN(32);
data_end = .;
} >writable_data AT>image
data_lma = LOADADDR(.data);
/* Everything beyond this point will not be included in the binary. */
bin_end = data_lma + SIZEOF(.data);
/* The entry point code assumes that .bss is 16-byte aligned. */
.bss : ALIGN(16) {
bss_begin = .;
*(.bss.*)
*(COMMON)
. = ALIGN(16);
bss_end = .;
} >writable_data
init_stack_pointer = ORIGIN(writable_data) + LENGTH(writable_data);
.stack (NOLOAD) : ALIGN(4096) {
. += 4096; /* Ensure we have one guard page for overflow. */
stack_limit = .;
. = init_stack_pointer;
} >writable_data
/* Make our Bionic stack protector compatible with mainline LLVM */
__stack_chk_guard = __bionic_tls + 40;
/*
* Remove unused sections from the image.
*/
/DISCARD/ : {
/* The image loads itself so doesn't need these sections. */
*(.gnu.hash)
*(.hash)
*(.interp)
*(.eh_frame_hdr)
*(.eh_frame)
*(.note.gnu.build-id)
}
}