cmscrab.macro

******************************************************************
* CMSCRAB MACRO                                                  *
* The CMSCRAB (C Runtime Anchor Block) defines the save area /   *
* stack frame used by GCCCMS                                     *
*                                                                *
* Part of GCCLIB - VM/370 CMS Native Std C Library;              *
*                  A Historic Computing Toy                      *
*                                                                *
* Proud Contributors: See contrib memo                           *
*                                                                *
* Released to the public domain.                                 *
******************************************************************
*
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***   M U S T   B E   S Y N C E D   W I T H   C M S R U N T M . H   ***
***********************************************************************
*
         MACRO
         CMSCRAB
         SPACE
* ---------------------------------------------------------------------
* This first section describes the save area / stack frame defined by
* each routine. The GCC compiler knows that the local variables start
* at offset 88 (MAINSTK) ...
* ---------------------------------------------------------------------
CMSCRAB  DSECT             the GCC C Runtime Anchor Block
DSTACK   DS    F           +00 dynamic stack control (see cmsruntm.h)
BACK     DS    F           +04 backchain to previous save area
FORWARD  DS    F           +08 forward chain to next save area
GR14     DS    F           +12 register save area
GR15     DS    F           +16 register save area
GR0      DS    F           +20 register save area
GR1      DS    F           +24 register save area
GR2      DS    F           +28 register save area
GR3      DS    F           +32 register save area
GR4      DS    F           +36 register save area
GR5      DS    F           +40 register save area
GR6      DS    F           +44 register save area
GR7      DS    F           +48 register save area
GR8      DS    F           +52 register save area
GR9      DS    F           +56 register save area
GR10     DS    F           +60 register save area
GR11     DS    F           +64 register save area
GR12     DS    F           +68 register save area
GCCCRABA DS    F           +72 address of GCC C Runtime Anchor Block
STACKNXT DS    F           +76 next available byte on the stack
NUMCONV  DS    F           +80 numeric conversion buffer
FUNCRSLT DS    F           +84 function result buffer
         SPACE
* ---------------------------------------------------------------------
* The GCC Bootstrap stack space/length
* Basically the C local variables etc. start from MAINSTK in each
* stack frame
* ---------------------------------------------------------------------
MAINSTK  DS    0D             Bootstrap Stack (4K)
         SPACE
MAINLEN  EQU   4096                    length of the stack
STACKLEN EQU   4096+MAINSTK-CMSCRAB    length of the CRAB
         MEND