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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sparc/vdso/vdso-layout.lds.S
26426 views
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/*

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 * Linker script for vDSO.  This is an ELF shared object prelinked to

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 * its virtual address, and with only one read-only segment.

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 * This script controls its layout.

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 */

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#if defined(BUILD_VDSO64)

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# define SHDR_SIZE 64

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#elif defined(BUILD_VDSO32)

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# define SHDR_SIZE 40

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#else

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# error unknown VDSO target

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#endif

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#define NUM_FAKE_SHDRS 7

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SECTIONS

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{

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	/*

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	 * User/kernel shared data is before the vDSO.  This may be a little

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	 * uglier than putting it after the vDSO, but it avoids issues with

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	 * non-allocatable things that dangle past the end of the PT_LOAD

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	 * segment. Page size is 8192 for both 64-bit and 32-bit vdso binaries

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	 */

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	vvar_start = . -8192;

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	vvar_data = vvar_start;

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	. = SIZEOF_HEADERS;

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	.hash		: { *(.hash) }			:text

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	.gnu.hash	: { *(.gnu.hash) }

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	.dynsym		: { *(.dynsym) }

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	.dynstr		: { *(.dynstr) }

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	.gnu.version	: { *(.gnu.version) }

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	.gnu.version_d	: { *(.gnu.version_d) }

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	.gnu.version_r	: { *(.gnu.version_r) }

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	.dynamic	: { *(.dynamic) }		:text	:dynamic

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	.rodata		: {

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		*(.rodata*)

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		*(.data*)

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		*(.sdata*)

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		*(.got.plt) *(.got)

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		*(.gnu.linkonce.d.*)

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		*(.bss*)

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		*(.dynbss*)

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		*(.gnu.linkonce.b.*)

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		/*

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		 * Ideally this would live in a C file: kept in here for

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		 * compatibility with x86-64.

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		 */

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		VDSO_FAKE_SECTION_TABLE_START = .;

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		. = . + NUM_FAKE_SHDRS * SHDR_SIZE;

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		VDSO_FAKE_SECTION_TABLE_END = .;

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	}						:text

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	.fake_shstrtab	: { *(.fake_shstrtab) }		:text

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	.note		: { *(.note.*) }		:text	:note

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	.eh_frame_hdr	: { *(.eh_frame_hdr) }		:text	:eh_frame_hdr

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	.eh_frame	: { KEEP (*(.eh_frame)) }	:text

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	/*

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	 * Text is well-separated from actual data: there's plenty of

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	 * stuff that isn't used at runtime in between.

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	 */

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	.text		: { *(.text*) }			:text	=0x90909090,

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	/DISCARD/ : {

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		*(.discard)

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		*(.discard.*)

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		*(__bug_table)

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	}

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}

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/*

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 * Very old versions of ld do not recognize this name token; use the constant.

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 */

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#define PT_GNU_EH_FRAME	0x6474e550

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/*

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 * We must supply the ELF program headers explicitly to get just one

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 * PT_LOAD segment, and set the flags explicitly to make segments read-only.

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 */

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PHDRS

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{

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	text		PT_LOAD		FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */

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	dynamic		PT_DYNAMIC	FLAGS(4);		/* PF_R */

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	note		PT_NOTE		FLAGS(4);		/* PF_R */

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	eh_frame_hdr	PT_GNU_EH_FRAME;

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}

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