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1.1 ! root 1: /* ! 2: * kobj.c - identify and parse a sparc object file ! 3: */ ! 4: #include <u.h> ! 5: #include <libc.h> ! 6: #include <bio.h> ! 7: #include "kc/k.out.h" ! 8: #include "obj.h" ! 9: ! 10: typedef struct Addr Addr; ! 11: struct Addr ! 12: { ! 13: char type; ! 14: char sym; ! 15: char name; ! 16: }; ! 17: static Addr addr(Biobuf*); ! 18: static char type2char(int); ! 19: static void skip(Biobuf*, int); ! 20: ! 21: ! 22: int ! 23: _isk(char *s) ! 24: { ! 25: return s[0] == ANAME /* ANAME */ ! 26: && s[1] == D_FILE /* type */ ! 27: && s[2] == 1 /* sym */ ! 28: && s[3] == '<'; /* name of file */ ! 29: } ! 30: ! 31: ! 32: int ! 33: _readk(Biobuf *bp, Prog *p) ! 34: { ! 35: int as, n; ! 36: Addr a; ! 37: ! 38: as = Bgetc(bp); /* as */ ! 39: if(as < 0) ! 40: return 0; ! 41: p->kind = aNone; ! 42: if(as == ANAME){ ! 43: p->kind = aName; ! 44: p->type = type2char(Bgetc(bp)); /* type */ ! 45: p->sym = Bgetc(bp); /* sym */ ! 46: n = 0; ! 47: for(;;) { ! 48: as = Bgetc(bp); ! 49: if(as < 0) ! 50: return 0; ! 51: n++; ! 52: if(as == 0) ! 53: break; ! 54: } ! 55: p->id = malloc(n); ! 56: if(p->id == 0) ! 57: return 0; ! 58: Bseek(bp, -n, 1); ! 59: if(Bread(bp, p->id, n) != n) ! 60: return 0; ! 61: return 1; ! 62: } ! 63: if(as == ATEXT) ! 64: p->kind = aText; ! 65: else if(as == AGLOBL) ! 66: p->kind = aData; ! 67: skip(bp, 5); /* reg (1 byte); lineno (4 bytes) */ ! 68: a = addr(bp); ! 69: addr(bp); ! 70: if(a.type != D_OREG || a.name != D_STATIC && a.name != D_EXTERN) ! 71: p->kind = aNone; ! 72: p->sym = a.sym; ! 73: return 1; ! 74: } ! 75: ! 76: static Addr ! 77: addr(Biobuf *bp) ! 78: { ! 79: Addr a; ! 80: long off; ! 81: ! 82: a.type = Bgetc(bp); /* a.type */ ! 83: skip(bp, 1); /* reg */ ! 84: a.sym = Bgetc(bp); /* sym index */ ! 85: a.name = Bgetc(bp); /* sym type */ ! 86: switch(a.type) { ! 87: default: ! 88: case D_NONE: case D_REG: case D_FREG: case D_CREG: case D_PREG: ! 89: break; ! 90: case D_BRANCH: ! 91: case D_OREG: ! 92: case D_ASI: ! 93: case D_CONST: ! 94: off = Bgetc(bp); ! 95: off |= Bgetc(bp) << 8; ! 96: off |= Bgetc(bp) << 16; ! 97: off |= Bgetc(bp) << 24; ! 98: if(off < 0) ! 99: off = -off; ! 100: if(a.sym!=0 && (a.name==D_PARAM || a.name==D_AUTO)) ! 101: _offset(a.sym, off); ! 102: break; ! 103: case D_SCONST: ! 104: skip(bp, NSNAME); ! 105: break; ! 106: case D_FCONST: ! 107: skip(bp, 8); ! 108: break; ! 109: } ! 110: return a; ! 111: } ! 112: ! 113: ! 114: static char ! 115: type2char(int t) ! 116: { ! 117: switch(t){ ! 118: case D_EXTERN: return 'U'; ! 119: case D_STATIC: return 'b'; ! 120: case D_AUTO: return 'a'; ! 121: case D_PARAM: return 'p'; ! 122: default: return UNKNOWN; ! 123: } ! 124: } ! 125: ! 126: static void ! 127: skip(Biobuf *bp, int n) ! 128: { ! 129: while (n-- > 0) ! 130: Bgetc(bp); ! 131: }
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