| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | |
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| 3 | #ifndef PARSE_VDSO_H |
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| 4 | #define PARSE_VDSO_H |
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| 5 | |
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| 6 | #include <stdint.h> |
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| 7 | |
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| 8 | /* |
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| 9 | * To use this vDSO parser, first call one of the vdso_init_* functions. |
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| 10 | * If you've already parsed auxv, then pass the value of AT_SYSINFO_EHDR |
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| 11 | * to vdso_init_from_sysinfo_ehdr. Otherwise pass auxv to vdso_init_from_auxv. |
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| 12 | * Then call vdso_sym for each symbol you want. For example, to look up |
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| 13 | * gettimeofday on x86_64, use: |
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| 14 | * |
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| 15 | * <some pointer> = vdso_sym("LINUX_2.6", "gettimeofday"); |
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| 16 | * or |
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| 17 | * <some pointer> = vdso_sym("LINUX_2.6", "__vdso_gettimeofday"); |
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| 18 | * |
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| 19 | * vdso_sym will return 0 if the symbol doesn't exist or if the init function |
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| 20 | * failed or was not called. vdso_sym is a little slow, so its return value |
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| 21 | * should be cached. |
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| 22 | * |
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| 23 | * vdso_sym is threadsafe; the init functions are not. |
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| 24 | * |
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| 25 | * These are the prototypes: |
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| 26 | */ |
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| 27 | void *vdso_sym(const char *version, const char *name); |
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| 28 | void vdso_init_from_sysinfo_ehdr(uintptr_t base); |
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| 29 | void vdso_init_from_auxv(void *auxv); |
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| 30 | |
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| 31 | #endif |
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| 32 | |
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