1/* SPDX-License-Identifier: GPL-2.0 */ 2#include <asm/vdso.h> 3 4/* 5 * Linker script for vDSO. This is an ELF shared object prelinked to 6 * its virtual address, and with only one read-only segment. 7 * This script controls its layout. 8 */ 9 10SECTIONS 11{ 12 /* 13 * User/kernel shared data is before the vDSO. This may be a little 14 * uglier than putting it after the vDSO, but it avoids issues with 15 * non-allocatable things that dangle past the end of the PT_LOAD 16 * segment. 17 */ 18 19 vvar_start = . - 4 * PAGE_SIZE; 20 vvar_page = vvar_start; 21 22 /* Place all vvars at the offsets in asm/vvar.h. */ 23#define EMIT_VVAR(name, offset) vvar_ ## name = vvar_page + offset; 24#include <asm/vvar.h> 25#undef EMIT_VVAR 26 27 pvclock_page = vvar_start + PAGE_SIZE; 28 hvclock_page = vvar_start + 2 * PAGE_SIZE; 29 timens_page = vvar_start + 3 * PAGE_SIZE; 30 31#undef _ASM_X86_VVAR_H 32 /* Place all vvars in timens too at the offsets in asm/vvar.h. */ 33#define EMIT_VVAR(name, offset) timens_ ## name = timens_page + offset; 34#include <asm/vvar.h> 35#undef EMIT_VVAR 36 37 . = SIZEOF_HEADERS; 38 39 .hash : { *(.hash) } :text 40 .gnu.hash : { *(.gnu.hash) } 41 .dynsym : { *(.dynsym) } 42 .dynstr : { *(.dynstr) } 43 .gnu.version : { *(.gnu.version) } 44 .gnu.version_d : { *(.gnu.version_d) } 45 .gnu.version_r : { *(.gnu.version_r) } 46 47 .dynamic : { *(.dynamic) } :text :dynamic 48 49 .rodata : { 50 *(.rodata*) 51 *(.data*) 52 *(.sdata*) 53 *(.got.plt) *(.got) 54 *(.gnu.linkonce.d.*) 55 *(.bss*) 56 *(.dynbss*) 57 *(.gnu.linkonce.b.*) 58 } :text 59 60 /* 61 * Discard .note.gnu.property sections which are unused and have 62 * different alignment requirement from vDSO note sections. 63 */ 64 /DISCARD/ : { 65 *(.note.gnu.property) 66 } 67 .note : { *(.note.*) } :text :note 68 69 .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr 70 .eh_frame : { KEEP (*(.eh_frame)) } :text 71 72 73 /* 74 * Text is well-separated from actual data: there's plenty of 75 * stuff that isn't used at runtime in between. 76 */ 77 78 .text : { 79 *(.text*) 80 *(.fixup) 81 } :text =0x90909090, 82 83 84 85 .altinstructions : { *(.altinstructions) } :text 86 .altinstr_replacement : { *(.altinstr_replacement) } :text 87 88 __ex_table : { *(__ex_table) } :text 89 90 /DISCARD/ : { 91 *(.discard) 92 *(.discard.*) 93 *(__bug_table) 94 } 95} 96 97/* 98 * Very old versions of ld do not recognize this name token; use the constant. 99 */ 100#define PT_GNU_EH_FRAME 0x6474e550 101 102/* 103 * We must supply the ELF program headers explicitly to get just one 104 * PT_LOAD segment, and set the flags explicitly to make segments read-only. 105 */ 106PHDRS 107{ 108 text PT_LOAD FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */ 109 dynamic PT_DYNAMIC FLAGS(4); /* PF_R */ 110 note PT_NOTE FLAGS(4); /* PF_R */ 111 eh_frame_hdr PT_GNU_EH_FRAME; 112} 113