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Diffstat (limited to 'src/libmach/obj.c')
-rw-r--r-- | src/libmach/obj.c | 391 |
1 files changed, 391 insertions, 0 deletions
diff --git a/src/libmach/obj.c b/src/libmach/obj.c new file mode 100644 index 000000000..7999f24c6 --- /dev/null +++ b/src/libmach/obj.c @@ -0,0 +1,391 @@ +// Inferno libmach/obj.c +// http://code.google.com/p/inferno-os/source/browse/utils/libmach/obj.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. + +/* + * obj.c + * routines universal to all object files + */ +#include <u.h> +#include <libc.h> +#include <bio.h> +#include <ar.h> +#include <mach.h> +#include "obj.h" + +#define islocal(t) ((t)=='a' || (t)=='p') + +enum +{ + NNAMES = 50, + MAXIS = 8, /* max length to determine if a file is a .? file */ + MAXOFF = 0x7fffffff, /* larger than any possible local offset */ + NHASH = 1024, /* must be power of two */ + HASHMUL = 79L, +}; + +int _is2(char*), /* in [$OS].c */ + _is5(char*), + _is6(char*), + _is7(char*), + _is8(char*), + _is9(char*), + _isk(char*), + _isq(char*), + _isv(char*), + _isu(char*), + _read2(Biobuf*, Prog*), + _read5(Biobuf*, Prog*), + _read6(Biobuf*, Prog*), + _read7(Biobuf*, Prog*), + _read8(Biobuf*, Prog*), + _read9(Biobuf*, Prog*), + _readk(Biobuf*, Prog*), + _readq(Biobuf*, Prog*), + _readv(Biobuf*, Prog*), + _readu(Biobuf*, Prog*); + +typedef struct Obj Obj; +typedef struct Symtab Symtab; + +struct Obj /* functions to handle each intermediate (.$O) file */ +{ + char *name; /* name of each $O file */ + int (*is)(char*); /* test for each type of $O file */ + int (*read)(Biobuf*, Prog*); /* read for each type of $O file*/ +}; + +static Obj obj[] = +{ /* functions to identify and parse each type of obj */ + [Obj68020] = { "68020 .2", _is2, _read2 }, + [ObjAmd64] = { "amd64 .6", _is6 , _read6 }, + [ObjArm] = { "arm .5", _is5, _read5 }, + [ObjAlpha] = { "alpha .7", _is7, _read7 }, + [Obj386] = { "386 .8", _is8, _read8 }, + [ObjSparc] = { "sparc .k", _isk, _readk }, + [ObjPower] = { "power .q", _isq, _readq }, + [ObjMips] = { "mips .v", _isv, _readv }, + [ObjSparc64] = { "sparc64 .u", _isu, _readu }, + [ObjPower64] = { "power64 .9", _is9, _read9 }, + [Maxobjtype] = { 0, 0, 0 } +}; + +struct Symtab +{ + struct Sym s; + struct Symtab *next; +}; + +static Symtab *hash[NHASH]; +static Sym *names[NNAMES]; /* working set of active names */ + +static int processprog(Prog*,int); /* decode each symbol reference */ +static void objreset(void); +static void objlookup(int, char *, int, uint); +static void objupdate(int, int); + +static int sequence; + +int +objtype(Biobuf *bp, char **name) +{ + int i; + char buf[MAXIS]; + int c; + char *p; + + /* + * Look for import block. + */ + p = Brdline(bp, '\n'); + if(p == nil) + return -1; + if(Blinelen(bp) < 10 || strncmp(p, "go object ", 10) != 0) + return -1; + Bseek(bp, -1, 1); + + /* + * Found one. Skip until "\n!\n" + */ + for(;;) { + if((c = Bgetc(bp)) == Beof) + return -1; + if(c != '\n') + continue; + c = Bgetc(bp); + if(c != '!'){ + Bungetc(bp); + continue; + } + c = Bgetc(bp); + if(c != '\n'){ + Bungetc(bp); + continue; + } + break; + } + + if(Bread(bp, buf, MAXIS) < MAXIS) + return -1; + Bseek(bp, -MAXIS, 1); + for (i = 0; i < Maxobjtype; i++) { + if (obj[i].is && (*obj[i].is)(buf)) { + if (name) + *name = obj[i].name; + return i; + } + } + + return -1; +} + +int +isar(Biobuf *bp) +{ + int n; + char magbuf[SARMAG]; + + n = Bread(bp, magbuf, SARMAG); + if(n == SARMAG && strncmp(magbuf, ARMAG, SARMAG) == 0) + return 1; + return 0; +} + +/* + * determine what kind of object file this is and process it. + * return whether or not this was a recognized intermediate file. + */ +int +readobj(Biobuf *bp, int objtype) +{ + Prog p; + + if (objtype < 0 || objtype >= Maxobjtype || obj[objtype].is == 0) + return 1; + objreset(); + while ((*obj[objtype].read)(bp, &p)) + if (!processprog(&p, 1)) + return 0; + return 1; +} + +int +readar(Biobuf *bp, int objtype, vlong end, int doautos) +{ + Prog p; + + if (objtype < 0 || objtype >= Maxobjtype || obj[objtype].is == 0) + return 1; + objreset(); + while ((*obj[objtype].read)(bp, &p) && Boffset(bp) < end) + if (!processprog(&p, doautos)) + return 0; + return 1; +} + +/* + * decode a symbol reference or definition + */ +static int +processprog(Prog *p, int doautos) +{ + if(p->kind == aNone) + return 1; + if((schar)p->sym < 0 || p->sym >= NNAMES) + return 0; + switch(p->kind) + { + case aName: + if (!doautos) + if(p->type != 'U' && p->type != 'b') + break; + objlookup(p->sym, p->id, p->type, p->sig); + break; + case aText: + objupdate(p->sym, 'T'); + break; + case aData: + objupdate(p->sym, 'D'); + break; + default: + break; + } + return 1; +} + +/* + * find the entry for s in the symbol array. + * make a new entry if it is not already there. + */ +static void +objlookup(int id, char *name, int type, uint sig) +{ + int32 h; + char *cp; + Sym *s; + Symtab *sp; + + s = names[id]; + if(s && strcmp(s->name, name) == 0) { + s->type = type; + s->sig = sig; + return; + } + + h = *name; + for(cp = name+1; *cp; h += *cp++) + h *= HASHMUL; + h &= NHASH-1; + if (type == 'U' || type == 'b' || islocal(type)) { + for(sp = hash[h]; sp; sp = sp->next) + if(strcmp(sp->s.name, name) == 0) { + switch(sp->s.type) { + case 'T': + case 'D': + case 'U': + if (type == 'U') { + names[id] = &sp->s; + return; + } + break; + case 't': + case 'd': + case 'b': + if (type == 'b') { + names[id] = &sp->s; + return; + } + break; + case 'a': + case 'p': + if (islocal(type)) { + names[id] = &sp->s; + return; + } + break; + default: + break; + } + } + } + sp = malloc(sizeof(Symtab)); + sp->s.name = name; + sp->s.type = type; + sp->s.sig = sig; + sp->s.value = islocal(type) ? MAXOFF : 0; + sp->s.sequence = sequence++; + names[id] = &sp->s; + sp->next = hash[h]; + hash[h] = sp; + return; +} +/* + * traverse the symbol lists + */ +void +objtraverse(void (*fn)(Sym*, void*), void *pointer) +{ + int i; + Symtab *s; + + for(i = 0; i < NHASH; i++) + for(s = hash[i]; s; s = s->next) + (*fn)(&s->s, pointer); +} + +/* + * update the offset information for a 'a' or 'p' symbol in an intermediate file + */ +void +_offset(int id, vlong off) +{ + Sym *s; + + s = names[id]; + if (s && s->name[0] && islocal(s->type) && s->value > off) + s->value = off; +} + +/* + * update the type of a global text or data symbol + */ +static void +objupdate(int id, int type) +{ + Sym *s; + + s = names[id]; + if (s && s->name[0]) + if (s->type == 'U') + s->type = type; + else if (s->type == 'b') + s->type = tolower(type); +} + +/* + * look for the next file in an archive + */ +int +nextar(Biobuf *bp, int offset, char *buf) +{ + struct ar_hdr a; + int i, r; + int32 arsize; + + if (offset&01) + offset++; + Bseek(bp, offset, 0); + r = Bread(bp, &a, SAR_HDR); + if(r != SAR_HDR) + return 0; + if(strncmp(a.fmag, ARFMAG, sizeof(a.fmag))) + return -1; + for(i=0; i<sizeof(a.name) && i<SARNAME && a.name[i] != ' '; i++) + buf[i] = a.name[i]; + buf[i] = 0; + arsize = strtol(a.size, 0, 0); + if (arsize&1) + arsize++; + return arsize + SAR_HDR; +} + +static void +objreset(void) +{ + int i; + Symtab *s, *n; + + for(i = 0; i < NHASH; i++) { + for(s = hash[i]; s; s = n) { + n = s->next; + free(s->s.name); + free(s); + } + hash[i] = 0; + } + memset(names, 0, sizeof names); +} |