1/* 2 * Linker script for vsyscall DSO. The vsyscall page is an ELF shared 3 * object prelinked to its virtual address, and with only one read-only 4 * segment (that fits in one page). This script controls its layout. 5 */ 6#include <asm/asm-offsets.h> 7 8SECTIONS 9{ 10 . = VDSO_PRELINK_asm + SIZEOF_HEADERS; 11 12 .hash : { *(.hash) } :text 13 .gnu.hash : { *(.gnu.hash) } 14 .dynsym : { *(.dynsym) } 15 .dynstr : { *(.dynstr) } 16 .gnu.version : { *(.gnu.version) } 17 .gnu.version_d : { *(.gnu.version_d) } 18 .gnu.version_r : { *(.gnu.version_r) } 19 20 /* This linker script is used both with -r and with -shared. 21 For the layouts to match, we need to skip more than enough 22 space for the dynamic symbol table et al. If this amount 23 is insufficient, ld -shared will barf. Just increase it here. */ 24 . = VDSO_PRELINK_asm + 0x400; 25 26 .text : { *(.text) } :text =0x90909090 27 .note : { *(.note.*) } :text :note 28 .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr 29 .eh_frame : { KEEP (*(.eh_frame)) } :text 30 .dynamic : { *(.dynamic) } :text :dynamic 31 .useless : { 32 *(.got.plt) *(.got) 33 *(.data .data.* .gnu.linkonce.d.*) 34 *(.dynbss) 35 *(.bss .bss.* .gnu.linkonce.b.*) 36 } :text 37} 38 39/* 40 * We must supply the ELF program headers explicitly to get just one 41 * PT_LOAD segment, and set the flags explicitly to make segments read-only. 42 */ 43PHDRS 44{ 45 text PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */ 46 dynamic PT_DYNAMIC FLAGS(4); /* PF_R */ 47 note PT_NOTE FLAGS(4); /* PF_R */ 48 eh_frame_hdr 0x6474e550; /* PT_GNU_EH_FRAME, but ld doesn't match the name */ 49} 50 51/* 52 * This controls what symbols we export from the DSO. 53 */ 54VERSION 55{ 56 LINUX_2.5 { 57 global: 58 __kernel_vsyscall; 59 __kernel_sigreturn; 60 __kernel_rt_sigreturn; 61 62 local: *; 63 }; 64} 65 66/* The ELF entry point can be used to set the AT_SYSINFO value. */ 67ENTRY(__kernel_vsyscall); 68