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55 lines
1.6 KiB
55 lines
1.6 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* vvar.h: Shared vDSO/kernel variable declarations |
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* Copyright (c) 2011 Andy Lutomirski |
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* |
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* A handful of variables are accessible (read-only) from userspace |
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* code in the vsyscall page and the vdso. They are declared here. |
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* Some other file must define them with DEFINE_VVAR. |
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* |
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* In normal kernel code, they are used like any other variable. |
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* In user code, they are accessed through the VVAR macro. |
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* |
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* These variables live in a page of kernel data that has an extra RO |
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* mapping for userspace. Each variable needs a unique offset within |
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* that page; specify that offset with the DECLARE_VVAR macro. (If |
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* you mess up, the linker will catch it.) |
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*/ |
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#ifndef _ASM_X86_VVAR_H |
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#define _ASM_X86_VVAR_H |
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#ifdef EMIT_VVAR |
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/* |
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* EMIT_VVAR() is used by the kernel linker script to put vvars in the |
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* right place. Also, it's used by kernel code to import offsets values. |
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*/ |
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#define DECLARE_VVAR(offset, type, name) \ |
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EMIT_VVAR(name, offset) |
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#else |
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extern char __vvar_page; |
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#define DECLARE_VVAR(offset, type, name) \ |
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extern type vvar_ ## name[CS_BASES] \ |
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__attribute__((visibility("hidden"))); \ |
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extern type timens_ ## name[CS_BASES] \ |
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__attribute__((visibility("hidden"))); \ |
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#define VVAR(name) (vvar_ ## name) |
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#define TIMENS(name) (timens_ ## name) |
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#define DEFINE_VVAR(type, name) \ |
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type name[CS_BASES] \ |
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__attribute__((section(".vvar_" #name), aligned(16))) __visible |
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#endif |
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/* DECLARE_VVAR(offset, type, name) */ |
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DECLARE_VVAR(128, struct vdso_data, _vdso_data) |
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#undef DECLARE_VVAR |
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#endif
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