13e12c5d1SDavid du Colombier /* 2bd389b36SDavid du Colombier * vobj.c - identify and parse a mips object file 33e12c5d1SDavid du Colombier */ 43e12c5d1SDavid du Colombier #include <u.h> 53e12c5d1SDavid du Colombier #include <libc.h> 63e12c5d1SDavid du Colombier #include <bio.h> 73e12c5d1SDavid du Colombier #include "vc/v.out.h" 83e12c5d1SDavid du Colombier #include "obj.h" 93e12c5d1SDavid du Colombier 103e12c5d1SDavid du Colombier typedef struct Addr Addr; 113e12c5d1SDavid du Colombier struct Addr 123e12c5d1SDavid du Colombier { 133e12c5d1SDavid du Colombier char type; 143e12c5d1SDavid du Colombier char sym; 153e12c5d1SDavid du Colombier char name; 163e12c5d1SDavid du Colombier }; 17bd389b36SDavid du Colombier static Addr addr(Biobuf*); 183e12c5d1SDavid du Colombier static char type2char(int); 19bd389b36SDavid du Colombier static void skip(Biobuf*, int); 203e12c5d1SDavid du Colombier 213e12c5d1SDavid du Colombier int 223e12c5d1SDavid du Colombier _isv(char *s) 233e12c5d1SDavid du Colombier { 243e12c5d1SDavid du Colombier return s[0] == ANAME /* ANAME */ 253e12c5d1SDavid du Colombier && s[1] == D_FILE /* type */ 263e12c5d1SDavid du Colombier && s[2] == 1 /* sym */ 273e12c5d1SDavid du Colombier && s[3] == '<'; /* name of file */ 283e12c5d1SDavid du Colombier } 293e12c5d1SDavid du Colombier 30bd389b36SDavid du Colombier int 31bd389b36SDavid du Colombier _readv(Biobuf *bp, Prog *p) 323e12c5d1SDavid du Colombier { 33219b2ee8SDavid du Colombier int as, n; 343e12c5d1SDavid du Colombier Addr a; 353e12c5d1SDavid du Colombier 36bd389b36SDavid du Colombier as = Bgetc(bp); /* as */ 373e12c5d1SDavid du Colombier if(as < 0) 383e12c5d1SDavid du Colombier return 0; 393e12c5d1SDavid du Colombier p->kind = aNone; 40*061a3f44SDavid du Colombier if(as == ANAME || as == ASIGNAME){ 41*061a3f44SDavid du Colombier if(as == ASIGNAME) 42*061a3f44SDavid du Colombier skip(bp, 4); /* signature */ 433e12c5d1SDavid du Colombier p->kind = aName; 44bd389b36SDavid du Colombier p->type = type2char(Bgetc(bp)); /* type */ 45bd389b36SDavid du Colombier p->sym = Bgetc(bp); /* sym */ 46219b2ee8SDavid du Colombier n = 0; 47219b2ee8SDavid du Colombier for(;;) { 48219b2ee8SDavid du Colombier as = Bgetc(bp); 49219b2ee8SDavid du Colombier if(as < 0) 50219b2ee8SDavid du Colombier return 0; 51219b2ee8SDavid du Colombier n++; 52219b2ee8SDavid du Colombier if(as == 0) 53219b2ee8SDavid du Colombier break; 543e12c5d1SDavid du Colombier } 55219b2ee8SDavid du Colombier p->id = malloc(n); 56219b2ee8SDavid du Colombier if(p->id == 0) 57219b2ee8SDavid du Colombier return 0; 58219b2ee8SDavid du Colombier Bseek(bp, -n, 1); 59219b2ee8SDavid du Colombier if(Bread(bp, p->id, n) != n) 60219b2ee8SDavid du Colombier return 0; 61bd389b36SDavid du Colombier return 1; 623e12c5d1SDavid du Colombier } 633e12c5d1SDavid du Colombier if(as == ATEXT) 643e12c5d1SDavid du Colombier p->kind = aText; 653e12c5d1SDavid du Colombier else if(as == AGLOBL) 663e12c5d1SDavid du Colombier p->kind = aData; 67bd389b36SDavid du Colombier skip(bp, 5); /* reg(1), lineno(4) */ 68bd389b36SDavid du Colombier a = addr(bp); 69bd389b36SDavid du Colombier addr(bp); 70bd389b36SDavid du Colombier if(a.type != D_OREG || a.name != D_STATIC && a.name != D_EXTERN) 713e12c5d1SDavid du Colombier p->kind = aNone; 723e12c5d1SDavid du Colombier p->sym = a.sym; 73bd389b36SDavid du Colombier return 1; 743e12c5d1SDavid du Colombier } 753e12c5d1SDavid du Colombier 763e12c5d1SDavid du Colombier static Addr 77bd389b36SDavid du Colombier addr(Biobuf *bp) 783e12c5d1SDavid du Colombier { 793e12c5d1SDavid du Colombier Addr a; 80bd389b36SDavid du Colombier long off; 813e12c5d1SDavid du Colombier 82bd389b36SDavid du Colombier a.type = Bgetc(bp); /* a.type */ 83bd389b36SDavid du Colombier skip(bp,1); /* reg */ 84bd389b36SDavid du Colombier a.sym = Bgetc(bp); /* sym index */ 85bd389b36SDavid du Colombier a.name = Bgetc(bp); /* sym type */ 863e12c5d1SDavid du Colombier switch(a.type){ 873e12c5d1SDavid du Colombier default: 883e12c5d1SDavid du Colombier case D_NONE: case D_REG: case D_FREG: case D_MREG: 893e12c5d1SDavid du Colombier case D_FCREG: case D_LO: case D_HI: 903e12c5d1SDavid du Colombier break; 913e12c5d1SDavid du Colombier case D_OREG: 923e12c5d1SDavid du Colombier case D_CONST: 933e12c5d1SDavid du Colombier case D_BRANCH: 94bd389b36SDavid du Colombier off = Bgetc(bp); 95bd389b36SDavid du Colombier off |= Bgetc(bp) << 8; 96bd389b36SDavid du Colombier off |= Bgetc(bp) << 16; 97bd389b36SDavid du Colombier off |= Bgetc(bp) << 24; 98bd389b36SDavid du Colombier if(off < 0) 99bd389b36SDavid du Colombier off = -off; 100bd389b36SDavid du Colombier if(a.sym && (a.name==D_PARAM || a.name==D_AUTO)) 101bd389b36SDavid du Colombier _offset(a.sym, off); 1023e12c5d1SDavid du Colombier break; 1033e12c5d1SDavid du Colombier case D_SCONST: 104bd389b36SDavid du Colombier skip(bp, NSNAME); 1053e12c5d1SDavid du Colombier break; 1063e12c5d1SDavid du Colombier case D_FCONST: 107bd389b36SDavid du Colombier skip(bp, 8); 1083e12c5d1SDavid du Colombier break; 1093e12c5d1SDavid du Colombier } 1103e12c5d1SDavid du Colombier return a; 1113e12c5d1SDavid du Colombier } 1123e12c5d1SDavid du Colombier 1133e12c5d1SDavid du Colombier static char 1143e12c5d1SDavid du Colombier type2char(int t) 1153e12c5d1SDavid du Colombier { 1163e12c5d1SDavid du Colombier switch(t){ 1173e12c5d1SDavid du Colombier case D_EXTERN: return 'U'; 1183e12c5d1SDavid du Colombier case D_STATIC: return 'b'; 1193e12c5d1SDavid du Colombier case D_AUTO: return 'a'; 1203e12c5d1SDavid du Colombier case D_PARAM: return 'p'; 1213e12c5d1SDavid du Colombier default: return UNKNOWN; 1223e12c5d1SDavid du Colombier } 1233e12c5d1SDavid du Colombier } 124bd389b36SDavid du Colombier 125bd389b36SDavid du Colombier static void 126bd389b36SDavid du Colombier skip(Biobuf *bp, int n) 127bd389b36SDavid du Colombier { 128bd389b36SDavid du Colombier while (n-- > 0) 129bd389b36SDavid du Colombier Bgetc(bp); 130bd389b36SDavid du Colombier } 131