| 1 | static char sccsid[] = "@(#)access.c 4.2 8/17/82"; |
| 2 | # |
| 3 | /* |
| 4 | * |
| 5 | * UNIX debugger |
| 6 | * |
| 7 | */ |
| 8 | |
| 9 | #include "head.h" |
| 10 | struct user u; |
| 11 | |
| 12 | |
| 13 | MSG BADDAT; |
| 14 | MSG BADTXT; |
| 15 | MAP txtmap; |
| 16 | MAP datmap; |
| 17 | STRING errflg; |
| 18 | int errno; |
| 19 | |
| 20 | INT pid; |
| 21 | |
| 22 | |
| 23 | |
| 24 | |
| 25 | /* file handling and access routines */ |
| 26 | |
| 27 | int dmask[5] = {0, 0xff, 0xffff, 0xffffff, 0xffffffff}; |
| 28 | |
| 29 | /* get data at loc using descriptor format d */ |
| 30 | long |
| 31 | getval(loc, d, space) |
| 32 | ADDR loc; |
| 33 | char d; { |
| 34 | register int val; |
| 35 | |
| 36 | val = get(loc, space); |
| 37 | val &= dmask[dtol(d)]; |
| 38 | return(val); |
| 39 | } |
| 40 | |
| 41 | /* put value at loc using descriptor format d */ |
| 42 | putval(loc, d, value) |
| 43 | ADDR loc; char d; long value; { |
| 44 | register long val; |
| 45 | |
| 46 | val = get(loc, DSP); |
| 47 | val = (val & !dmask[dtol(d)]) | (value & dmask[dtol(d)]); |
| 48 | put(loc, DSP, val); |
| 49 | } |
| 50 | |
| 51 | /* put value in named register using descriptor format d */ |
| 52 | putreg(reg, d, value) |
| 53 | ADDR reg; char d; long value; { |
| 54 | register long val; |
| 55 | |
| 56 | val = *(ADDR *)(((ADDR)&u)+R0+WORDSIZE*reg); |
| 57 | val = (val & !dmask[dtol(d)]) | (value & dmask[dtol(d)]); |
| 58 | *(ADDR *)(((ADDR)&u)+R0+WORDSIZE*reg) = val; |
| 59 | } |
| 60 | |
| 61 | put(adr,space,value) |
| 62 | L_INT adr; |
| 63 | { |
| 64 | access(WT,adr,space,value); |
| 65 | } |
| 66 | |
| 67 | POS get(adr, space) |
| 68 | L_INT adr; |
| 69 | { |
| 70 | return(access(RD,adr,space,0)); |
| 71 | } |
| 72 | |
| 73 | |
| 74 | access(mode,adr,space,value) |
| 75 | L_INT adr; |
| 76 | { |
| 77 | INT pmode,rd,file; |
| 78 | ADDR w; |
| 79 | if (debug) |
| 80 | printf("access(mode=%d,adr=%d,space=%d,value=%d) with pid %d\n", |
| 81 | mode, adr, space, value, pid); |
| 82 | rd = mode==RD; |
| 83 | |
| 84 | IF space == NSP THEN return(0); FI |
| 85 | |
| 86 | IF pid /* tracing on? */ |
| 87 | THEN |
| 88 | #ifndef vax |
| 89 | IF adr&01 ANDF !rd THEN error(ODDADR); FI |
| 90 | #endif |
| 91 | pmode = (space&DSP?(rd?RDUSER:WDUSER):(rd?RIUSER:WIUSER)); |
| 92 | w = ptrace(pmode, pid, adr, value); |
| 93 | if (debug) |
| 94 | printf("ptrace(%d,%d,%d,%d) = %d with error=%d\n", |
| 95 | pmode, pid, adr, value, w, errno); |
| 96 | #ifndef vax |
| 97 | IF adr&01 |
| 98 | THEN w1 = ptrace(pmode, pid, shorten(adr+1), value); |
| 99 | w = (w>>8)&LOBYTE | (w1<<8); |
| 100 | FI |
| 101 | #endif |
| 102 | IF errno |
| 103 | THEN errflg = (space&DSP ? BADDAT : BADTXT); |
| 104 | FI |
| 105 | return(w); |
| 106 | FI |
| 107 | w = 0; |
| 108 | IF !chkmap(&adr,space) |
| 109 | THEN return(0); |
| 110 | FI |
| 111 | file=(space&DSP?datmap.ufd:txtmap.ufd); |
| 112 | if (longseek(file,adr)==0 || |
| 113 | (rd ? read(file,&w,sizeof(w)) : write(file,&value,sizeof(w))) < 1) |
| 114 | errflg=(space&DSP?BADDAT:BADTXT); |
| 115 | return(w); |
| 116 | |
| 117 | } |
| 118 | |
| 119 | chkmap(adr,space) |
| 120 | REG L_INT *adr; |
| 121 | REG INT space; |
| 122 | { |
| 123 | REG MAPPTR amap; |
| 124 | amap=((space&DSP?&datmap:&txtmap)); |
| 125 | IF space&STAR ORF !within(*adr,amap->b1,amap->e1) |
| 126 | THEN if (within(*adr,amap->b2,amap->e2)) |
| 127 | *adr += (amap->f2)-(amap->b2); |
| 128 | else { |
| 129 | errflg=(space&DSP?BADDAT:BADTXT); return(0); |
| 130 | } |
| 131 | ELSE *adr += (amap->f1)-(amap->b1); |
| 132 | FI |
| 133 | return(1); |
| 134 | } |
| 135 | |
| 136 | within(adr,lbd,ubd) |
| 137 | POS adr, lbd, ubd; |
| 138 | { |
| 139 | return(adr>=lbd && adr<ubd); |
| 140 | } |
| 141 | |
| 142 | /* ------------ */ |
| 143 | POS chkget(n, space) |
| 144 | L_INT n; |
| 145 | { |
| 146 | #ifndef vax |
| 147 | REG INT w; |
| 148 | #else |
| 149 | REG L_INT w; |
| 150 | #endif |
| 151 | |
| 152 | w = get(n, space); |
| 153 | chkerr(); |
| 154 | return(w); |
| 155 | } |
| 156 | |
| 157 | POS bchkget(n, space) |
| 158 | L_INT n; |
| 159 | { |
| 160 | return(chkget(n, space) & LOBYTE); |
| 161 | } |