1 # 2 static char sccsid[] = " dosig.c 1.1 82/05/12 "; 3 4 /* Handle signal trapping from version 6 or version 7 compatability 5 * mode programs. 6 * Art Wetzel November 1979 7 */ 8 #ifdef TRACE 9 #include <stdio.h> 10 #endif 11 #include <signal.h> 12 #include "defs.h" 13 unsigned int sigvals[NSIG+1]; 14 /* actual catch point for all signals */ 15 sigcatch(signum) int signum; { 16 unsigned short *pcptr; 17 extern getregs(); 18 if(incompat) { 19 /* hurry up and get the registers before they are destroyed */ 20 getregs(); 21 } else { 22 /* we were in native mode simulating a sys call */ 23 /* set it up with the old values */ 24 dosig(signum, pc); 25 /* go back where we were doing the sys call */ 26 return(0); 27 } 28 /* figure out the pc */ 29 pcptr = (unsigned short *)((char *)&pcptr + 20); 30 pc = (unsigned short *) *pcptr; 31 /* get the psl with condition codes */ 32 /* requires UNIX-32V patch to not clear out condition codes */ 33 psl = 0x83c00000 | (*(pcptr - 6) & 017); 34 /* actually do the thing */ 35 if(sigvals[signum] != (unsigned int)SIG_DFL && (sigvals[signum] & (unsigned int)SIG_IGN) == 0) 36 dosig(signum, pc); 37 /* go back to compatability mode and the signal routine there */ 38 incompat++; 39 compat(); 40 } 41 /* routine to set up pdp11 space for return from a signal */ 42 dosig(signum, from) { 43 unsigned short *sp; 44 #ifdef TRACE 45 fprintf(stderr,"Caught sig %d from 0%o -> 0%o\n",signum,(pc-1),*(pc-1)); 46 #endif 47 /* where is the stack */ 48 sp = (unsigned short *)regs[6]; 49 /* stack up psw condition codes so rti works */ 50 *(--sp) = psl & 017; 51 /* stack pc */ 52 *(--sp) = (unsigned short)(int)pc; 53 /* reset stack pointer */ 54 regs[6] = (unsigned short)(int)sp; 55 /* reset pc to signal catching routine */ 56 pc = (unsigned short *)sigvals[signum]; 57 } 58