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f6b46ebf90
This revamps the vDSO linker script to lay things out with the best packing of the data and good, separate alignment of the code. The rigid layout using VDSO_TEXT_OFFSET no longer matters to the kernel. I've moved the layout parts of the linker script into a new include file, vdso-layout.lds.S; this is in preparation for sharing the script for the 32-bit vDSO builds too. Signed-off-by: Roland McGrath <roland@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
38 lines
862 B
ArmAsm
38 lines
862 B
ArmAsm
/*
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* Linker script for 64-bit vDSO.
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* We #include the file to define the layout details.
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* Here we only choose the prelinked virtual address.
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*
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* This file defines the version script giving the user-exported symbols in
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* the DSO. We can define local symbols here called VDSO* to make their
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* values visible using the asm-x86/vdso.h macros from the kernel proper.
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*/
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#define VDSO_PRELINK 0xffffffffff700000
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#include "vdso-layout.lds.S"
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/*
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* This controls what userland symbols we export from the vDSO.
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*/
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VERSION {
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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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VDSO64_PRELINK = VDSO_PRELINK;
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/*
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* Define VDSO64_x for each VEXTERN(x), for use via VDSO64_SYMBOL.
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*/
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#define VEXTERN(x) VDSO64_ ## x = vdso_ ## x;
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#include "vextern.h"
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#undef VEXTERN
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