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All AutoGen.obj files consist of global GUID definitions, fixed and patchable PCDs and other data that is essentially read-only at runtime but has not been declared as such for various reasons. By moving these contents to .text we achieve two things: - global GUIDs and other data items which must be constant for correct program operation can no longer be modified, for instance, when running a DXE_RUNTIME_MODULE binary under the OS with the Properties Table feature for memory protection enabled; - the .data section becomes smaller, and may be dropped completely for many XIP modules, which reduces wasted FV space if the PE/COFF section alignment is large. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> Tested-by: Liming Gao <liming.gao@intel.com> Tested-by: Leif Lindholm <leif.lindholm@linaro.org> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18137 6f19259b-4bc3-4df7-8a09-765794883524
71 lines
2.1 KiB
Plaintext
71 lines
2.1 KiB
Plaintext
/** @file
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Unified linker script for GCC based builds
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Copyright (c) 2010 - 2015, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2015, Linaro Ltd. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available under
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the terms and conditions of the BSD License that accompanies this distribution.
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The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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SECTIONS {
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/*
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* The PE/COFF binary consists of DOS and PE/COFF headers, and a sequence of
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* section headers adding up to PECOFF_HEADER_SIZE bytes (which differs
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* between 32-bit and 64-bit builds). The actual start of the .text section
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* will be rounded up based on its actual alignment.
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*/
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. = PECOFF_HEADER_SIZE;
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.text : ALIGN(CONSTANT(COMMONPAGESIZE)) {
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*(.text .text.* .stub .gnu.linkonce.t.*)
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*(.rodata .rodata.* .gnu.linkonce.r.*)
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*(.got .got.*)
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/*
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* The contents of AutoGen.c files are constant from the POV of the program,
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* but most of its contents end up in .data or .bss by default since few of
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* the variable definitions that get emitted are declared as CONST.
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*/
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*:AutoGen.obj(.data .data.* .bss .bss.*)
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}
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/*
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* The alignment of the .data section should be less than or equal to the
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* alignment of the .text section. This ensures that the relative offset
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* between these sections is the same in the ELF and the PE/COFF versions of
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* this binary.
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*/
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.data ALIGN(ALIGNOF(.text)) : ALIGN(CONSTANT(COMMONPAGESIZE)) {
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*(.data .data.* .gnu.linkonce.d.*)
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*(.bss .bss.* *COM*)
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}
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.eh_frame ALIGN(CONSTANT(COMMONPAGESIZE)) : {
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KEEP (*(.eh_frame))
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}
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.rela ALIGN(CONSTANT(COMMONPAGESIZE)) : {
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*(.rela .rela.*)
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}
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/DISCARD/ : {
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*(.note.GNU-stack)
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*(.gnu_debuglink)
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*(.interp)
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*(.dynsym)
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*(.dynstr)
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*(.dynamic)
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*(.hash)
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*(.comment)
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}
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}
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