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| 2 | |
| 3 | * Linux/PA-RISC Project (http://www.parisc-linux.org/)
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| 4 | *
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| 5 | * Floating-point emulation code
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| 6 | * Copyright (C) 2001 Hewlett-Packard (Paul Bame) <[email protected]>
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| 7 |
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| 8 |
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| 9 | #ifdef __NO_PA_HDRS
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| 10 | PA header file -- do not include this header file for non-PA builds.
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| 11 | #endif
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| 12 |
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| 13 |
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| 14 | |
| 15 | * These macros are designed to be portable to all machines that have
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| 16 | * a wordsize greater than or equal to 32 bits that support the portable
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| 17 | * C compiler and the standard C preprocessor. Wordsize (default 32)
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| 18 | * and bitfield assignment (default left-to-right, unlike VAX, PDP-11)
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| 19 | * should be predefined using the constants HOSTWDSZ and BITFRL and
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| 20 | * the C compiler "-D" flag (e.g., -DHOSTWDSZ=36 -DBITFLR for the DEC-20).
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| 21 | * Note that the macro arguments assume that the integer being referenced
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| 22 | * is a 32-bit integer (right-justified on the 20) and that bit 0 is the
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| 23 | * most significant bit.
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| 24 |
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| 25 |
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| 26 | #ifndef HOSTWDSZ
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| 27 | #define HOSTWDSZ 32
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| 28 | #endif
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| 29 |
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| 30 |
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| 31 |
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| 32 |
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| 33 | |
| 34 | * NewDeclareBitField_Reference - Declare a structure similar to the simulator
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| 35 | * function "DeclBitfR" except its use is restricted to occur within a larger
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| 36 | * enclosing structure or union definition. This declaration is an unnamed
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| 37 | * structure with the argument, name, as the member name and the argument,
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| 38 | * uname, as the element name.
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| 39 | *-----------------------------------------------------------------------
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| 40 | #define Bitfield_extract(start, length, object) \
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| 41 | ((object) >> (HOSTWDSZ - (start) - (length)) & \
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| 42 | ((unsigned)-1 >> (HOSTWDSZ - (length))))
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| 43 |
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| 44 | #define Bitfield_signed_extract(start, length, object) \
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| 45 | ((int)((object) << start) >> (HOSTWDSZ - (length)))
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| 46 |
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| 47 | #define Bitfield_mask(start, len, object) \
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| 48 | ((object) & (((unsigned)-1 >> (HOSTWDSZ-len)) << (HOSTWDSZ-start-len)))
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| 49 |
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| 50 | #define Bitfield_deposit(value,start,len,object) object = \
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| 51 | ((object) & ~(((unsigned)-1 >> (HOSTWDSZ-len)) << (HOSTWDSZ-start-len))) | \
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| 52 | (((value) & ((unsigned)-1 >> (HOSTWDSZ-len))) << (HOSTWDSZ-start-len))
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