1/* 2 * Linker script for vDSO. This is an ELF shared object prelinked to 3 * its virtual address, and with only one read-only segment. 4 * This script controls its layout. 5 */ 6 7#include <vdso/datapage.h> 8#include <vdso/page.h> 9#include <asm/vdso/vsyscall.h> 10 11SECTIONS 12{ 13 /* 14 * User/kernel shared data is before the vDSO. This may be a little 15 * uglier than putting it after the vDSO, but it avoids issues with 16 * non-allocatable things that dangle past the end of the PT_LOAD 17 * segment. Page size is 8192 for both 64-bit and 32-bit vdso binaries 18 */ 19 20 VDSO_VVAR_SYMS 21 22 . = SIZEOF_HEADERS; 23 24 .hash : { *(.hash) } :text 25 .gnu.hash : { *(.gnu.hash) } 26 .dynsym : { *(.dynsym) } 27 .dynstr : { *(.dynstr) } 28 .gnu.version : { *(.gnu.version) } 29 .gnu.version_d : { *(.gnu.version_d) } 30 .gnu.version_r : { *(.gnu.version_r) } 31 32 .dynamic : { *(.dynamic) } :text :dynamic 33 34 .rodata : { 35 *(.rodata*) 36 *(.data*) 37 *(.sdata*) 38 *(.got.plt) *(.got) 39 *(.gnu.linkonce.d.*) 40 *(.bss*) 41 *(.dynbss*) 42 *(.gnu.linkonce.b.*) 43 } :text 44 45 .note : { *(.note.*) } :text :note 46 47 .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr 48 .eh_frame : { KEEP (*(.eh_frame)) } :text 49 50 51 /* 52 * Text is well-separated from actual data: there's plenty of 53 * stuff that isn't used at runtime in between. 54 */ 55 56 .text : { *(.text*) } :text =0x90909090, 57 58 /DISCARD/ : { 59 *(.discard) 60 *(.discard.*) 61 *(__bug_table) 62 } 63} 64 65/* 66 * Very old versions of ld do not recognize this name token; use the constant. 67 */ 68#define PT_GNU_EH_FRAME 0x6474e550 69 70/* 71 * We must supply the ELF program headers explicitly to get just one 72 * PT_LOAD segment, and set the flags explicitly to make segments read-only. 73 */ 74PHDRS 75{ 76 text PT_LOAD FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */ 77 dynamic PT_DYNAMIC FLAGS(4); /* PF_R */ 78 note PT_NOTE FLAGS(4); /* PF_R */ 79 eh_frame_hdr PT_GNU_EH_FRAME; 80} 81