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 8#ifdef CONFIG_CPU_LITTLE_ENDIAN 9OUTPUT_FORMAT("elf32-sh-linux", "elf32-sh-linux", "elf32-sh-linux") 10#else 11OUTPUT_FORMAT("elf32-shbig-linux", "elf32-shbig-linux", "elf32-shbig-linux") 12#endif 13OUTPUT_ARCH(sh) 14 15/* The ELF entry point can be used to set the AT_SYSINFO value. */ 16ENTRY(__kernel_vsyscall); 17 18SECTIONS 19{ 20 . = SIZEOF_HEADERS; 21 22 .hash : { *(.hash) } :text 23 .gnu.hash : { *(.gnu.hash) } 24 .dynsym : { *(.dynsym) } 25 .dynstr : { *(.dynstr) } 26 .gnu.version : { *(.gnu.version) } 27 .gnu.version_d : { *(.gnu.version_d) } 28 .gnu.version_r : { *(.gnu.version_r) } 29 30 /* 31 * This linker script is used both with -r and with -shared. 32 * For the layouts to match, we need to skip more than enough 33 * space for the dynamic symbol table et al. If this amount 34 * is insufficient, ld -shared will barf. Just increase it here. 35 */ 36 . = 0x400; 37 38 .text : { *(.text) } :text =0x90909090 39 .note : { *(.note.*) } :text :note 40 .eh_frame_hdr : { *(.eh_frame_hdr ) } :text :eh_frame_hdr 41 .eh_frame : { KEEP (*(.eh_frame)) } :text 42 .dynamic : { *(.dynamic) } :text :dynamic 43 .useless : { 44 *(.got.plt) *(.got) 45 *(.data .data.* .gnu.linkonce.d.*) 46 *(.dynbss) 47 *(.bss .bss.* .gnu.linkonce.b.*) 48 } :text 49} 50 51/* 52 * Very old versions of ld do not recognize this name token; use the constant. 53 */ 54#define PT_GNU_EH_FRAME 0x6474e550 55 56/* 57 * We must supply the ELF program headers explicitly to get just one 58 * PT_LOAD segment, and set the flags explicitly to make segments read-only. 59 */ 60PHDRS 61{ 62 text PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */ 63 dynamic PT_DYNAMIC FLAGS(4); /* PF_R */ 64 note PT_NOTE FLAGS(4); /* PF_R */ 65 eh_frame_hdr PT_GNU_EH_FRAME; 66} 67 68/* 69 * This controls what symbols we export from the DSO. 70 */ 71VERSION 72{ 73 LINUX_2.6 { 74 global: 75 __kernel_vsyscall; 76 __kernel_sigreturn; 77 __kernel_rt_sigreturn; 78 79 local: *; 80 }; 81} 82