mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
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2aae950b21
This implements new vDSO for x86-64. The concept is similar to the existing vDSOs on i386 and PPC. x86-64 has had static vsyscalls before, but these are not flexible enough anymore. A vDSO is a ELF shared library supplied by the kernel that is mapped into user address space. The vDSO mapping is randomized for each process for security reasons. Doing this was needed for clock_gettime, because clock_gettime always needs a syscall fallback and having one at a fixed address would have made buffer overflow exploits too easy to write. The vdso can be disabled with vdso=0 It currently includes a new gettimeofday implemention and optimized clock_gettime(). The gettimeofday implementation is slightly faster than the one in the old vsyscall. clock_gettime is significantly faster than the syscall for CLOCK_MONOTONIC and CLOCK_REALTIME. The new calls are generally faster than the old vsyscall. Advantages over the old x86-64 vsyscalls: - Extensible - Randomized - Cleaner - Easier to virtualize (the old static address range previously causes overhead e.g. for Xen because it has to create special page tables for it) Weak points: - glibc support still to be written The VM interface is partly based on Ingo Molnar's i386 version. Includes compile fix from Joachim Deguara Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
77 lines
2.1 KiB
ArmAsm
77 lines
2.1 KiB
ArmAsm
/*
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* Linker script for vsyscall DSO. The vsyscall page is an ELF shared
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* object prelinked to its virtual address, and with only one read-only
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* segment (that fits in one page). This script controls its layout.
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*/
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#include <asm/asm-offsets.h>
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#include "voffset.h"
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#define VDSO_PRELINK 0xffffffffff700000
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SECTIONS
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{
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. = VDSO_PRELINK + SIZEOF_HEADERS;
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.hash : { *(.hash) } :text
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.gnu.hash : { *(.gnu.hash) }
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.dynsym : { *(.dynsym) }
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.dynstr : { *(.dynstr) }
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.gnu.version : { *(.gnu.version) }
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.gnu.version_d : { *(.gnu.version_d) }
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.gnu.version_r : { *(.gnu.version_r) }
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/* This linker script is used both with -r and with -shared.
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For the layouts to match, we need to skip more than enough
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space for the dynamic symbol table et al. If this amount
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is insufficient, ld -shared will barf. Just increase it here. */
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. = VDSO_PRELINK + VDSO_TEXT_OFFSET;
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.text : { *(.text) } :text
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.text.ptr : { *(.text.ptr) } :text
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. = VDSO_PRELINK + 0x900;
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.data : { *(.data) } :text
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.bss : { *(.bss) } :text
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.altinstructions : { *(.altinstructions) } :text
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.altinstr_replacement : { *(.altinstr_replacement) } :text
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.note : { *(.note.*) } :text :note
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.eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr
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.eh_frame : { KEEP (*(.eh_frame)) } :text
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.dynamic : { *(.dynamic) } :text :dynamic
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.useless : {
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*(.got.plt) *(.got)
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*(.gnu.linkonce.d.*)
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*(.dynbss)
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*(.gnu.linkonce.b.*)
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} :text
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}
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/*
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* We must supply the ELF program headers explicitly to get just one
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* PT_LOAD segment, and set the flags explicitly to make segments read-only.
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*/
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PHDRS
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{
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text PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */
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dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
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note PT_NOTE FLAGS(4); /* PF_R */
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eh_frame_hdr 0x6474e550; /* PT_GNU_EH_FRAME, but ld doesn't match the name */
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}
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/*
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* This controls what symbols we export from the DSO.
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*/
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VERSION
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{
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LINUX_2.6 {
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global:
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clock_gettime;
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__vdso_clock_gettime;
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gettimeofday;
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__vdso_gettimeofday;
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getcpu;
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__vdso_getcpu;
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local: *;
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};
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}
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