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47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
#ifndef COSMOPOLITAN_LIBC_RUNTIME_FSGSBASE_H_
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#define COSMOPOLITAN_LIBC_RUNTIME_FSGSBASE_H_
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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void *_rdfsbase(void);
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void *_rdgsbase(void);
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void *_wrfsbase(void *);
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void *_wrgsbase(void *);
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int _have_fsgsbase(void);
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#if defined(__GNUC__) && !defined(__STRICT_ANSI__) && defined(__x86_64__)
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#define _rdfsbase() \
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({ \
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void *_p; \
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asm("rdfsbase\t%0" : "=r"(_p)); \
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_p; \
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})
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#define _rdgsbase() \
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({ \
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void *_p; \
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asm("rdgsbase\t%0" : "=r"(_p)); \
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_p; \
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})
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#define _wrfsbase(p) \
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({ \
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void *_p = p; \
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asm volatile("wrfsbase\t%0" \
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: /* no outputs */ \
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: "r"(_p) \
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: "memory"); \
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_p; \
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})
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#define _wrgsbase(p) \
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({ \
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void *_p = p; \
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asm volatile("wrgsbase\t%0" \
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: /* no outputs */ \
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: "r"(_p) \
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: "memory"); \
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_p; \
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})
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#endif /* GNUC && !ANSI */
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_RUNTIME_FSGSBASE_H_ */
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