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32682f0ce7
In order to improve our chances of success building other open source projects we shouldn't define APIs that'll lead any ./configure script astray. For example: - brk() and sbrk() can break mac/windows support - syscall() is a superb way to break portability - arch_prctl() is the greatest of all horror shows
26 lines
887 B
C
26 lines
887 B
C
#ifndef COSMOPOLITAN_LIBC_BITS_SEGMENTATION_H_
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#define COSMOPOLITAN_LIBC_BITS_SEGMENTATION_H_
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
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#ifdef COSMO
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/**
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* Reads scalar from memory, offset by segment.
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*
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* @return *(MEM) relative to segment
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* @see pushpop()
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*/
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#define fs(MEM) __peek("fs", MEM)
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#define gs(MEM) __peek("gs", MEM)
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#define __peek(SEGMENT, ADDRESS) \
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({ \
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typeof(*(ADDRESS)) Pk; \
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asm("mov\t%%" SEGMENT ":%1,%0" : "=r"(Pk) : "m"(*(ADDRESS))); \
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Pk; \
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})
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#endif /* COSMO */
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#endif /* __GNUC__ && !__STRICT_ANSI__ */
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_BITS_SEGMENTATION_H_ */
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