diff options
Diffstat (limited to 'vdso/vdso_amd64.lds')
-rw-r--r-- | vdso/vdso_amd64.lds | 102 |
1 files changed, 0 insertions, 102 deletions
diff --git a/vdso/vdso_amd64.lds b/vdso/vdso_amd64.lds deleted file mode 100644 index d114290da..000000000 --- a/vdso/vdso_amd64.lds +++ /dev/null @@ -1,102 +0,0 @@ -/* - * Linker script for the VDSO. - * - * The VDSO is essentially a normal ELF shared library that is mapped into the - * address space of the process that is going to use it. The address of the - * VDSO is passed to the runtime linker in the AT_SYSINFO_EHDR entry of the aux - * vector. - * - * There are, however, three ways in which the VDSO differs from a normal - * shared library: - * - * - The runtime linker does not attempt to process any relocations for the - * VDSO so it is the responsibility of whoever loads the VDSO into the - * address space to do this if necessary. Because of this restriction we are - * careful to ensure that the VDSO does not need to have any relocations - * applied to it. - * - * - Although the VDSO is position independent and would normally be linked at - * virtual address 0, the Linux kernel VDSO is actually linked at a non zero - * virtual address and the code in the system runtime linker that handles the - * VDSO expects this to be the case so we have to explicitly link this VDSO - * at a non zero address. The actual address is arbitrary, but we use the - * same one as the Linux kernel VDSO. - * - * - The VDSO will be directly mmapped by the sentry, rather than going through - * a normal ELF loading process. The VDSO must be carefully constructed such - * that the layout in the ELF file is identical to the layout in memory. - */ - -VDSO_PRELINK = 0xffffffffff700000; - -SECTIONS { - /* The parameter page is mapped just before the VDSO. */ - _params = VDSO_PRELINK - 0x1000; - - . = VDSO_PRELINK + SIZEOF_HEADERS; - - .hash : { *(.hash) } :text - .gnu.hash : { *(.gnu.hash) } - .dynsym : { *(.dynsym) } - .dynstr : { *(.dynstr) } - .gnu.version : { *(.gnu.version) } - .gnu.version_d : { *(.gnu.version_d) } - .gnu.version_r : { *(.gnu.version_r) } - - .note : { *(.note.*) } :text :note - - .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr - .eh_frame : { KEEP (*(.eh_frame)) } :text - - .dynamic : { *(.dynamic) } :text :dynamic - - .rodata : { *(.rodata*) } :text - - .altinstructions : { *(.altinstructions) } - .altinstr_replacement : { *(.altinstr_replacement) } - - /* - * TODO(gvisor.dev/issue/157): Remove this alignment? Then the VDSO would fit - * in a single page. - */ - . = ALIGN(0x1000); - .text : { *(.text*) } :text =0x90909090 - - /* - * N.B. There is no data/bss section. This VDSO neither needs nor uses a data - * section. We omit it entirely because some gcc/clang and gold/bfd version - * combinations struggle to handle an empty data PHDR segment (internal - * linker assertion failures result). - * - * If the VDSO does incorrectly include a data section, the linker will - * include it in the text segment. check_vdso.py looks for this degenerate - * case. - */ -} - -PHDRS { - text PT_LOAD FLAGS(5) FILEHDR PHDRS; /* PF_R | PF_X */ - dynamic PT_DYNAMIC FLAGS(4); /* PF_R */ - note PT_NOTE FLAGS(4); /* PF_R */ - eh_frame_hdr PT_GNU_EH_FRAME; -} - -/* - * Define the symbols that are to be exported. - */ -VERSION { - LINUX_2.6 { - global: - clock_gettime; - __vdso_clock_gettime; - gettimeofday; - __vdso_gettimeofday; - getcpu; - __vdso_getcpu; - time; - __vdso_time; - __kernel_rt_sigreturn; - - local: *; - }; -} |