/*
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* Linker script for vDSO. This is an ELF shared object prelinked to
|
* 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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/*
|
* Ideally this would live in a C file: kept in here for
|
* 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
|
|
|
/*
|
* Text is well-separated from actual data: there's plenty of
|
* stuff that isn't used at runtime in between.
|
*/
|
|
.text : { *(.text*) } :text =0x90909090,
|
|
/DISCARD/ : {
|
*(.discard)
|
*(.discard.*)
|
*(__bug_table)
|
}
|
}
|
|
/*
|
* Very old versions of ld do not recognize this name token; use the constant.
|
*/
|
#define PT_GNU_EH_FRAME 0x6474e550
|
|
/*
|
* We must supply the ELF program headers explicitly to get just one
|
* PT_LOAD segment, and set the flags explicitly to make segments read-only.
|
*/
|
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 */
|
eh_frame_hdr PT_GNU_EH_FRAME;
|
}
|
