| // Inferno libmach/8obj.c |
| // http://code.google.com/p/inferno-os/source/browse/utils/libmach/8obj.c |
| // |
| // Copyright © 1994-1999 Lucent Technologies Inc. |
| // Power PC support Copyright © 1995-2004 C H Forsyth (forsyth@terzarima.net). |
| // Portions Copyright © 1997-1999 Vita Nuova Limited. |
| // Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com). |
| // Revisions Copyright © 2000-2004 Lucent Technologies Inc. and others. |
| // Portions Copyright © 2009 The Go Authors. All rights reserved. |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a copy |
| // of this software and associated documentation files (the "Software"), to deal |
| // in the Software without restriction, including without limitation the rights |
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| // copies of the Software, and to permit persons to whom the Software is |
| // furnished to do so, subject to the following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included in |
| // all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| // THE SOFTWARE. |
| |
| /* |
| * 8obj.c - identify and parse a 386 object file |
| */ |
| #include <u.h> |
| #include <libc.h> |
| #include <bio.h> |
| #include <mach.h> |
| #include "../cmd/8l/8.out.h" |
| #include "obj.h" |
| |
| typedef struct Addr Addr; |
| struct Addr |
| { |
| char sym; |
| char flags; |
| char gotype; |
| }; |
| static Addr addr(Biobuf*); |
| static char type2char(int); |
| static void skip(Biobuf*, int); |
| |
| int |
| _is8(char *t) |
| { |
| uchar *s = (uchar*)t; |
| |
| return s[0] == (ANAME&0xff) /* aslo = ANAME */ |
| && s[1] == ((ANAME>>8)&0xff) |
| && s[2] == D_FILE /* type */ |
| && s[3] == 1 /* sym */ |
| && s[4] == '<'; /* name of file */ |
| } |
| |
| int |
| _read8(Biobuf *bp, Prog* p) |
| { |
| int as, n, c; |
| Addr a; |
| |
| as = Bgetc(bp); /* as(low) */ |
| if(as < 0) |
| return 0; |
| c = Bgetc(bp); /* as(high) */ |
| if(c < 0) |
| return 0; |
| as |= ((c & 0xff) << 8); |
| p->kind = aNone; |
| p->sig = 0; |
| if(as == ANAME || as == ASIGNAME){ |
| if(as == ASIGNAME){ |
| Bread(bp, &p->sig, 4); |
| p->sig = leswal(p->sig); |
| } |
| p->kind = aName; |
| p->type = type2char(Bgetc(bp)); /* type */ |
| p->sym = Bgetc(bp); /* sym */ |
| n = 0; |
| for(;;) { |
| as = Bgetc(bp); |
| if(as < 0) |
| return 0; |
| n++; |
| if(as == 0) |
| break; |
| } |
| p->id = malloc(n); |
| if(p->id == 0) |
| return 0; |
| Bseek(bp, -n, 1); |
| if(Bread(bp, p->id, n) != n) |
| return 0; |
| return 1; |
| } |
| if(as == ATEXT) |
| p->kind = aText; |
| if(as == AGLOBL) |
| p->kind = aData; |
| skip(bp, 4); /* lineno(4) */ |
| a = addr(bp); |
| addr(bp); |
| if(!(a.flags & T_SYM)) |
| p->kind = aNone; |
| p->sym = a.sym; |
| return 1; |
| } |
| |
| static Addr |
| addr(Biobuf *bp) |
| { |
| Addr a; |
| int t; |
| long off; |
| |
| off = 0; |
| a.sym = -1; |
| a.flags = Bgetc(bp); /* flags */ |
| if(a.flags & T_INDEX) |
| skip(bp, 2); |
| if(a.flags & T_OFFSET){ |
| off = Bgetc(bp); |
| off |= Bgetc(bp) << 8; |
| off |= Bgetc(bp) << 16; |
| off |= Bgetc(bp) << 24; |
| if(off < 0) |
| off = -off; |
| } |
| if(a.flags & T_OFFSET2){ |
| Bgetc(bp); |
| Bgetc(bp); |
| Bgetc(bp); |
| Bgetc(bp); |
| } |
| if(a.flags & T_SYM) |
| a.sym = Bgetc(bp); |
| if(a.flags & T_FCONST) |
| skip(bp, 8); |
| else |
| if(a.flags & T_SCONST) |
| skip(bp, NSNAME); |
| if(a.flags & T_TYPE) { |
| t = Bgetc(bp); |
| if(a.sym > 0 && (t==D_PARAM || t==D_AUTO)) |
| _offset(a.sym, off); |
| } |
| if(a.flags & T_GOTYPE) |
| a.gotype = Bgetc(bp); |
| return a; |
| } |
| |
| static char |
| type2char(int t) |
| { |
| switch(t){ |
| case D_EXTERN: return 'U'; |
| case D_STATIC: return 'b'; |
| case D_AUTO: return 'a'; |
| case D_PARAM: return 'p'; |
| default: return UNKNOWN; |
| } |
| } |
| |
| static void |
| skip(Biobuf *bp, int n) |
| { |
| while (n-- > 0) |
| Bgetc(bp); |
| } |