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98 lines
2.2 KiB
98 lines
2.2 KiB
/* |
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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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