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| 1 | ! Miscellaneous constants used in assembler code.
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| 2 | W = _WORD_SIZE ! Machine word size.
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| 3 |
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| 4 | ! Offsets in struct proc. They MUST match proc.h.
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| 5 | P_STACKBASE = 0
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| 6 | #if _WORD_SIZE == 2
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| 7 | ESREG = P_STACKBASE
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| 8 | #else
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| 9 | GSREG = P_STACKBASE
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| 10 | FSREG = GSREG + 2 ! 386 introduces FS and GS segments
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| 11 | ESREG = FSREG + 2
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| 12 | #endif
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| 13 | DSREG = ESREG + 2
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| 14 | DIREG = DSREG + 2
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| 15 | SIREG = DIREG + W
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| 16 | BPREG = SIREG + W
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| 17 | STREG = BPREG + W ! hole for another SP
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| 18 | BXREG = STREG + W
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| 19 | DXREG = BXREG + W
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| 20 | CXREG = DXREG + W
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| 21 | AXREG = CXREG + W
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| 22 | RETADR = AXREG + W ! return address for save() call
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| 23 | PCREG = RETADR + W
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| 24 | CSREG = PCREG + W
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| 25 | PSWREG = CSREG + W
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| 26 | SPREG = PSWREG + W
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| 27 | SSREG = SPREG + W
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| 28 | P_STACKTOP = SSREG + W
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| 29 | P_LDT_SEL = P_STACKTOP
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| 30 | P_LDT = P_LDT_SEL + W
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| 31 |
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| 32 | #if _WORD_SIZE == 2
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| 33 | Msize = 12 ! size of a message in 16-bit words
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| 34 | #else
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| 35 | Msize = 9 ! size of a message in 32-bit words
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| 36 | #endif
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