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78 lines
1.6 KiB
78 lines
1.6 KiB
/*[
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pop.c
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LOCAL CHAR SccsID[]="@(#)pop.c 1.5 02/09/94";
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POP CPU Functions.
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------------------
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]*/
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#include <insignia.h>
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#include <host_def.h>
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#include <xt.h>
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#include <c_main.h>
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#include <c_addr.h>
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#include <c_bsic.h>
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#include <c_prot.h>
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#include <c_seg.h>
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#include <c_stack.h>
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#include <c_xcptn.h>
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#include <c_reg.h>
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#include <pop.h>
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#include <mov.h>
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/*
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=====================================================================
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EXTERNAL ROUTINES START HERE
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=====================================================================
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*/
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/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
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/* Generic - one size fits all 'pop'. */
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/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
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GLOBAL VOID
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POP
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IFN1(
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IU32 *, pop1
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)
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{
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validate_stack_exists(USE_SP, (ISM32)NR_ITEMS_1);
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*pop1 = spop();
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}
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/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
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/* 'pop' to segment register. */
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/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
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GLOBAL VOID
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POP_SR
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IFN1(
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IU32, op1 /* index to segment register */
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)
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{
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IU32 op2; /* data from stack */
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/* get implicit operand without changing (E)SP */
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validate_stack_exists(USE_SP, (ISM32)NR_ITEMS_1);
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op2 = tpop(STACK_ITEM_1, NULL_BYTE_OFFSET);
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/* only use bottom 16-bits */
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op2 &= WORD_MASK;
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/* do the move */
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MOV_SR(op1, op2);
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/* if it works update (E)SP */
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change_SP((IS32)NR_ITEMS_1);
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}
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