projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| a137be3b BJ |
1 | # |
| 2 | /* | |
| 3 | * | |
| 4 | * UNIX debugger | |
| 5 | * | |
| 6 | */ | |
| 7 | ||
| 8 | #include "defs.h" | |
| 9 | SCCSID(@(#)access.c 2.2); | |
| 10 | ||
| 11 | ||
| 12 | MSG ODDADR; | |
| 13 | MSG BADDAT; | |
| 14 | MSG BADTXT; | |
| 15 | MAP txtmap; | |
| 16 | MAP datmap; | |
| 17 | INT wtflag; | |
| 18 | STRING errflg; | |
| 19 | INT errno; | |
| 20 | ||
| 21 | INT pid; | |
| 22 | ||
| 23 | ||
| 24 | ||
| 25 | ||
| 26 | /* file handling and access routines */ | |
| 27 | ||
| 28 | put(adr,space,value) | |
| 29 | #ifndef EDDT | |
| 30 | L_INT adr; | |
| 31 | { | |
| 32 | access(WT,adr,space,value); | |
| 33 | } | |
| 34 | #else | |
| 35 | L_INT *adr; {*adr=value;} | |
| 36 | #endif | |
| 37 | ||
| 38 | POS get(adr, space) | |
| 39 | #ifndef EDDT | |
| 40 | L_INT adr; | |
| 41 | { | |
| 42 | return(access(RD,adr,space,0)); | |
| 43 | } | |
| 44 | #else | |
| 45 | L_INT *adr; {return(*adr);} | |
| 46 | #endif | |
| 47 | ||
| 48 | POS chkget(n, space) | |
| 49 | L_INT n; | |
| 50 | { | |
| 51 | #ifndef vax | |
| 52 | REG INT w; | |
| 53 | #else | |
| 54 | REG L_INT w; | |
| 55 | #endif | |
| 56 | ||
| 57 | w = get(n, space); | |
| 58 | chkerr(); | |
| 59 | return(w); | |
| 60 | } | |
| 61 | ||
| 62 | POS bchkget(n, space) | |
| 63 | L_INT n; | |
| 64 | { | |
| 65 | return(chkget(n, space) & LOBYTE); | |
| 66 | } | |
| 67 | ||
| 68 | #ifndef EDDT | |
| 69 | access(mode,adr,space,value) | |
| 70 | L_INT adr; | |
| 71 | { | |
| 72 | INT pmode,rd,file; | |
| 73 | ADDR w; | |
| 74 | rd = mode==RD; | |
| 75 | ||
| 76 | IF space == NSP THEN return(0); FI | |
| 77 | ||
| 78 | IF pid /* tracing on? */ | |
| 79 | THEN | |
| 80 | #ifndef vax | |
| 81 | IF adr&01 ANDF !rd THEN error(ODDADR); FI | |
| 82 | #endif | |
| 83 | pmode = (space&DSP?(rd?RDUSER:WDUSER):(rd?RIUSER:WIUSER)); | |
| 84 | w = ptrace(pmode, pid, adr, value); | |
| 85 | #ifndef vax | |
| 86 | IF adr&01 | |
| 87 | THEN w1 = ptrace(pmode, pid, shorten(adr+1), value); | |
| 88 | w = (w>>8)&LOBYTE | (w1<<8); | |
| 89 | FI | |
| 90 | #endif | |
| 91 | IF errno | |
| 92 | THEN errflg = (space&DSP ? BADDAT : BADTXT); | |
| 93 | FI | |
| 94 | return(w); | |
| 95 | FI | |
| 96 | w = 0; | |
| 97 | IF mode==WT ANDF wtflag==0 | |
| 98 | THEN error("not in write mode"); | |
| 99 | FI | |
| 100 | IF !chkmap(&adr,space) | |
| 101 | THEN return(0); | |
| 102 | FI | |
| 103 | file=(space&DSP?datmap.ufd:txtmap.ufd); | |
| 104 | IF longseek(file,adr)==0 ORF | |
| 105 | (rd ? read(file,&w,sizeof(w)) : write(file,&value,sizeof(w))) < 1 | |
| 106 | THEN errflg=(space&DSP?BADDAT:BADTXT); | |
| 107 | FI | |
| 108 | return(w); | |
| 109 | ||
| 110 | } | |
| 111 | #endif | |
| 112 | ||
| 113 | chkmap(adr,space) | |
| 114 | REG L_INT *adr; | |
| 115 | REG INT space; | |
| 116 | { | |
| 117 | REG MAPPTR amap; | |
| 118 | amap=((space&DSP?&datmap:&txtmap)); | |
| 119 | IF space&STAR ORF !within(*adr,amap->b1,amap->e1) | |
| 120 | THEN IF within(*adr,amap->b2,amap->e2) | |
| 121 | THEN *adr += (amap->f2)-(amap->b2); | |
| 122 | ELSE errflg=(space&DSP?BADDAT:BADTXT); return(0); | |
| 123 | FI | |
| 124 | ELSE *adr += (amap->f1)-(amap->b1); | |
| 125 | FI | |
| 126 | return(1); | |
| 127 | } | |
| 128 | ||
| 129 | within(adr,lbd,ubd) | |
| 130 | POS adr, lbd, ubd; | |
| 131 | { | |
| 132 | return(adr>=lbd && adr<ubd); | |
| 133 | } |