1*4882a593Smuzhiyun/* 2*4882a593Smuzhiyun * Linker script for vDSO. This is an ELF shared object prelinked to 3*4882a593Smuzhiyun * its virtual address, and with only one read-only segment. 4*4882a593Smuzhiyun * This script controls its layout. 5*4882a593Smuzhiyun */ 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun#if defined(BUILD_VDSO64) 8*4882a593Smuzhiyun# define SHDR_SIZE 64 9*4882a593Smuzhiyun#elif defined(BUILD_VDSO32) 10*4882a593Smuzhiyun# define SHDR_SIZE 40 11*4882a593Smuzhiyun#else 12*4882a593Smuzhiyun# error unknown VDSO target 13*4882a593Smuzhiyun#endif 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun#define NUM_FAKE_SHDRS 7 16*4882a593Smuzhiyun 17*4882a593SmuzhiyunSECTIONS 18*4882a593Smuzhiyun{ 19*4882a593Smuzhiyun /* 20*4882a593Smuzhiyun * User/kernel shared data is before the vDSO. This may be a little 21*4882a593Smuzhiyun * uglier than putting it after the vDSO, but it avoids issues with 22*4882a593Smuzhiyun * non-allocatable things that dangle past the end of the PT_LOAD 23*4882a593Smuzhiyun * segment. Page size is 8192 for both 64-bit and 32-bit vdso binaries 24*4882a593Smuzhiyun */ 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun vvar_start = . -8192; 27*4882a593Smuzhiyun vvar_data = vvar_start; 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun . = SIZEOF_HEADERS; 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun .hash : { *(.hash) } :text 32*4882a593Smuzhiyun .gnu.hash : { *(.gnu.hash) } 33*4882a593Smuzhiyun .dynsym : { *(.dynsym) } 34*4882a593Smuzhiyun .dynstr : { *(.dynstr) } 35*4882a593Smuzhiyun .gnu.version : { *(.gnu.version) } 36*4882a593Smuzhiyun .gnu.version_d : { *(.gnu.version_d) } 37*4882a593Smuzhiyun .gnu.version_r : { *(.gnu.version_r) } 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun .dynamic : { *(.dynamic) } :text :dynamic 40*4882a593Smuzhiyun 41*4882a593Smuzhiyun .rodata : { 42*4882a593Smuzhiyun *(.rodata*) 43*4882a593Smuzhiyun *(.data*) 44*4882a593Smuzhiyun *(.sdata*) 45*4882a593Smuzhiyun *(.got.plt) *(.got) 46*4882a593Smuzhiyun *(.gnu.linkonce.d.*) 47*4882a593Smuzhiyun *(.bss*) 48*4882a593Smuzhiyun *(.dynbss*) 49*4882a593Smuzhiyun *(.gnu.linkonce.b.*) 50*4882a593Smuzhiyun 51*4882a593Smuzhiyun /* 52*4882a593Smuzhiyun * Ideally this would live in a C file: kept in here for 53*4882a593Smuzhiyun * compatibility with x86-64. 54*4882a593Smuzhiyun */ 55*4882a593Smuzhiyun VDSO_FAKE_SECTION_TABLE_START = .; 56*4882a593Smuzhiyun . = . + NUM_FAKE_SHDRS * SHDR_SIZE; 57*4882a593Smuzhiyun VDSO_FAKE_SECTION_TABLE_END = .; 58*4882a593Smuzhiyun } :text 59*4882a593Smuzhiyun 60*4882a593Smuzhiyun .fake_shstrtab : { *(.fake_shstrtab) } :text 61*4882a593Smuzhiyun 62*4882a593Smuzhiyun 63*4882a593Smuzhiyun .note : { *(.note.*) } :text :note 64*4882a593Smuzhiyun 65*4882a593Smuzhiyun .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr 66*4882a593Smuzhiyun .eh_frame : { KEEP (*(.eh_frame)) } :text 67*4882a593Smuzhiyun 68*4882a593Smuzhiyun 69*4882a593Smuzhiyun /* 70*4882a593Smuzhiyun * Text is well-separated from actual data: there's plenty of 71*4882a593Smuzhiyun * stuff that isn't used at runtime in between. 72*4882a593Smuzhiyun */ 73*4882a593Smuzhiyun 74*4882a593Smuzhiyun .text : { *(.text*) } :text =0x90909090, 75*4882a593Smuzhiyun 76*4882a593Smuzhiyun /DISCARD/ : { 77*4882a593Smuzhiyun *(.discard) 78*4882a593Smuzhiyun *(.discard.*) 79*4882a593Smuzhiyun *(__bug_table) 80*4882a593Smuzhiyun } 81*4882a593Smuzhiyun} 82*4882a593Smuzhiyun 83*4882a593Smuzhiyun/* 84*4882a593Smuzhiyun * Very old versions of ld do not recognize this name token; use the constant. 85*4882a593Smuzhiyun */ 86*4882a593Smuzhiyun#define PT_GNU_EH_FRAME 0x6474e550 87*4882a593Smuzhiyun 88*4882a593Smuzhiyun/* 89*4882a593Smuzhiyun * We must supply the ELF program headers explicitly to get just one 90*4882a593Smuzhiyun * PT_LOAD segment, and set the flags explicitly to make segments read-only. 91*4882a593Smuzhiyun */ 92*4882a593SmuzhiyunPHDRS 93*4882a593Smuzhiyun{ 94*4882a593Smuzhiyun text PT_LOAD FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */ 95*4882a593Smuzhiyun dynamic PT_DYNAMIC FLAGS(4); /* PF_R */ 96*4882a593Smuzhiyun note PT_NOTE FLAGS(4); /* PF_R */ 97*4882a593Smuzhiyun eh_frame_hdr PT_GNU_EH_FRAME; 98*4882a593Smuzhiyun} 99