1/* 2 * Linker script for vsyscall DSO. The vsyscall page is an ELF shared 3 * object prelinked to its virtual address. This script controls its layout. 4 */ 5 6/* This must match <asm/fixmap.h>. */ 7VSYSCALL_BASE = 0xffffe000; 8 9SECTIONS 10{ 11 . = VSYSCALL_BASE + SIZEOF_HEADERS; 12 13 .hash : { *(.hash) } :text 14 .gnu.hash : { *(.gnu.hash) } 15 .dynsym : { *(.dynsym) } 16 .dynstr : { *(.dynstr) } 17 .gnu.version : { *(.gnu.version) } 18 .gnu.version_d : { *(.gnu.version_d) } 19 .gnu.version_r : { *(.gnu.version_r) } 20 21 /* This linker script is used both with -r and with -shared. 22 For the layouts to match, we need to skip more than enough 23 space for the dynamic symbol table et al. If this amount 24 is insufficient, ld -shared will barf. Just increase it here. */ 25 . = VSYSCALL_BASE + 0x400; 26 27 .text.vsyscall : { *(.text.vsyscall) } :text =0x90909090 28 29 /* This is an 32bit object and we cannot easily get the offsets 30 into the 64bit kernel. Just hardcode them here. This assumes 31 that all the stubs don't need more than 0x100 bytes. */ 32 . = VSYSCALL_BASE + 0x500; 33 34 .text.sigreturn : { *(.text.sigreturn) } :text =0x90909090 35 36 . = VSYSCALL_BASE + 0x600; 37 38 .text.rtsigreturn : { *(.text.rtsigreturn) } :text =0x90909090 39 40 .note : { *(.note.*) } :text :note 41 .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr 42 .eh_frame : { KEEP (*(.eh_frame)) } :text 43 .dynamic : { *(.dynamic) } :text :dynamic 44 .useless : { 45 *(.got.plt) *(.got) 46 *(.data .data.* .gnu.linkonce.d.*) 47 *(.dynbss) 48 *(.bss .bss.* .gnu.linkonce.b.*) 49 } :text 50} 51 52/* 53 * We must supply the ELF program headers explicitly to get just one 54 * PT_LOAD segment, and set the flags explicitly to make segments read-only. 55 */ 56PHDRS 57{ 58 text PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */ 59 dynamic PT_DYNAMIC FLAGS(4); /* PF_R */ 60 note PT_NOTE FLAGS(4); /* PF_R */ 61 eh_frame_hdr 0x6474e550; /* PT_GNU_EH_FRAME, but ld doesn't match the name */ 62} 63 64/* 65 * This controls what symbols we export from the DSO. 66 */ 67VERSION 68{ 69 LINUX_2.5 { 70 global: 71 __kernel_vsyscall; 72 __kernel_sigreturn; 73 __kernel_rt_sigreturn; 74 75 local: *; 76 }; 77} 78 79/* The ELF entry point can be used to set the AT_SYSINFO value. */ 80ENTRY(__kernel_vsyscall); 81