The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kernel/sconst.h

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

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