109 lines
2 KiB
C
109 lines
2 KiB
C
/* $Id$ */
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/* The Return Status Block contains, in push order:
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FIL, LIN, LB, PC, PI, rsbcode
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*/
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#include "logging.h"
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#include "global.h"
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#include "mem.h"
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#include "rsb.h"
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#include "proctab.h"
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#include "linfil.h"
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#include "shadow.h"
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#include "segment.h"
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#include "text.h"
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#include "warn.h"
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/* offsets to be added to a local base */
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int rsb_rsbcode;
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int rsb_PI;
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int rsb_PC;
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int rsb_LB;
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int rsb_LIN;
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int rsb_FIL;
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int rsbsize;
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void init_rsb(void)
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{
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rsb_rsbcode = 0;
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rsb_PI = wsize;
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rsb_PC = rsb_PI + psize;
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rsb_LB = rsb_PC + psize;
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rsb_LIN = rsb_LB + psize;
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rsb_FIL = rsb_LIN + LINSIZE;
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rsbsize = rsb_FIL + psize;
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}
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void pushrsb(int rsbcode)
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{
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/* fill Return Status Block */
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incSP((size)rsbsize);
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st_stdp(SP + rsb_FIL, getFIL());
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st_prot(SP + rsb_FIL, psize);
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st_stn(SP + rsb_LIN, (long)getLIN(), LINSIZE);
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st_prot(SP + rsb_LIN, LINSIZE);
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st_stdp(SP + rsb_LB, LB);
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st_prot(SP + rsb_LB, psize);
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st_stip(SP + rsb_PC, PC);
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st_prot(SP + rsb_PC, psize);
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st_stn(SP + rsb_PI, PI, psize);
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st_prot(SP + rsb_PI, psize);
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st_stw(SP + rsb_rsbcode, (long)rsbcode);
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st_prot(SP + rsb_rsbcode, wsize);
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newLB(SP);
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}
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/*ARGSUSED*/
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int poprsb(int rtt) /* set to 1 if working for RTT */
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{
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/* pops the RSB and returns the rsbcode, for further testing */
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register int rsbcode;
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#ifdef LOGGING
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{
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/* check SP */
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register ptr properSP = LB - proctab[PI].pr_nloc;
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if (SP < properSP)
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warning(rtt ? WRTTSTL : WRETSTL);
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if (SP > properSP)
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warning(rtt ? WRTTSTS : WRETSTS);
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}
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#endif /* LOGGING */
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/* discard stack up to RSB */
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newSP(LB);
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/* get RSB code and test it for applicability */
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rsbcode = st_lduw(SP + rsb_rsbcode);
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if ((rsbcode & RSBMASK) != RSBCODE) /* no RSB at all */
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return rsbcode;
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if (rsbcode != RSB_STP) {
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/* Restore registers PI, PC, LB, LIN and FIL
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from Return Status Block
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*/
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PI = st_lds(SP + rsb_PI, psize);
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newPC(st_ldip(SP + rsb_PC));
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newLB(st_lddp(SP + rsb_LB));
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putLIN((long) st_ldu(SP + rsb_LIN, LINSIZE));
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putFIL(st_lddp(SP + rsb_FIL));
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/* remove RSB */
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st_dec(rsbsize);
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pop_frames();
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}
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return rsbcode;
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}
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