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t_aout.c
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/* $VER: vlink t_aout.c V0.15e (23.03.17)
*
* This file is part of vlink, a portable linker for multiple
* object formats.
* Copyright (c) 1997-2017 Frank Wille
*/
#include "config.h"
#ifdef AOUT
#define T_AOUT_C
#include "vlink.h"
#include "aout.h"
/* common a.out linker symbols */
static const char *aout_symnames[] = {
gotbase_name,
pltbase_name,
dynamic_name
};
#define AOUTSTD_LNKSYMS 3
#define GOTSYM 0
#define PLTSYM 1
#define DYNAMICSYM 2
static struct ar_info ai; /* for scanning library archives */
static uint8_t sectype[] = { N_TEXT, N_DATA, N_BSS };
static uint8_t weaktype[] = { N_WEAKT, N_WEAKD, N_WEAKB };
/* for generating a.out files */
struct SymTabList aoutsymlist;
struct StrTabList aoutstrlist;
static struct list treloclist;
static struct list dreloclist;
/*****************************************************************/
/* Read a.out */
/*****************************************************************/
static uint32_t aout_txtoffset(struct aout_hdr *hdr,int be)
{
return (sizeof(struct aout_hdr));
}
static uint32_t aout_datoffset(struct aout_hdr *hdr,int be)
{
return ((GETMAGIC(hdr) == ZMAGIC) ?
(read32(be,hdr->a_text)) :
(sizeof(struct aout_hdr) + read32(be,hdr->a_text)));
}
static uint32_t aout_bssoffset(struct aout_hdr *hdr,int be)
{
return (aout_datoffset(hdr,be) + read32(be,&hdr->a_data));
}
static uint32_t aout_treloffset(struct aout_hdr *hdr,int be)
{
return (aout_bssoffset(hdr,be));
}
static uint32_t aout_dreloffset(struct aout_hdr *hdr,int be)
{
return (aout_treloffset(hdr,be) + read32(be,&hdr->a_trsize));
}
static uint32_t aout_symoffset(struct aout_hdr *hdr,int be)
{
return (aout_dreloffset(hdr,be) + read32(be,&hdr->a_drsize));
}
static uint32_t aout_stroffset(struct aout_hdr *hdr,int be)
{
return (aout_symoffset(hdr,be) + read32(be,&hdr->a_syms));
}
int aout_identify(struct FFFuncs *ff,char *name,struct aout_hdr *p,
unsigned long plen)
/* check a possible a.out file against the requirements, then */
/* return its type (object, library, shared object) */
{
uint32_t mid = ff->id;
bool arflag = FALSE;
if (plen < ff->headersize(0)) /* @@@ gv-ptr is not needed for a.out ! */
return (ID_UNKNOWN);
if (ar_init(&ai,(char *)p,plen,name)) {
/* library archive detected, extract 1st archive member */
arflag = TRUE;
if (!(ar_extract(&ai))) {
error(38,name); /* Empty archive ignored */
return (ID_IGNORE);
}
p = (struct aout_hdr *)ai.data;
}
if (GETMID(p) == mid) {
uint32_t mag = GETMAGIC(p);
int fl = GETFLAGS(p) & EX_DPMASK;
if (mag==OMAGIC || mag==NMAGIC || mag==ZMAGIC || mag==QMAGIC) {
/* valid a.out format for this machine detected! */
switch (mag) {
case OMAGIC:
return (arflag ? ID_LIBARCH : ID_OBJECT);
case NMAGIC:
case ZMAGIC:
if (arflag) {
if (fl == EX_DYNAMIC|EX_PIC)
error(39,name,ff->tname); /* no shared objects in lib archives */
else
error(40,name,ff->tname); /* no executables in lib archives */
return (ID_UNKNOWN);
}
if (fl == EX_DYNAMIC|EX_PIC)
return (ID_SHAREDOBJ);
return (ID_EXECUTABLE);
case QMAGIC:
error(84,name); /* QMAGIC is deprecated */
break;
}
}
}
return (ID_UNKNOWN);
}
static bool aout_check_ar_type(struct FFFuncs *ff,const char *name,
struct aout_hdr *hdr)
/* check all library archive members before conversion */
{
if (GETMID(hdr)==ff->id || GETMID(hdr)==0) {
switch (GETMAGIC(hdr)) {
case NMAGIC:
case ZMAGIC:
if (GETFLAGS(hdr)&EX_DPMASK == (EX_DYNAMIC|EX_PIC))
error(39,name,ff->tname); /* no shared objects in lib archives */
else
error(40,name,ff->tname); /* no executables in lib archives */
return FALSE;
case QMAGIC:
error(84,name); /* QMAGIC is deprecated */
case OMAGIC:
return TRUE;
default:
break;
}
}
return FALSE;
}
static void aout_create_section(struct ObjectUnit *ou,struct FFFuncs *ff,
const char *sec_name,uint8_t *data,
unsigned long size,uint8_t type)
{
struct LinkFile *lf = ou->lnkfile;
uint8_t flags=0,protection;
if (type != ST_UDATA) {
if (data+size > lf->data+lf->length) /* illegal section offset */
error(49,lf->pathname,sec_name,lf->objname);
}
switch (type) {
case ST_CODE:
protection = SP_READ|SP_EXEC;
break;
case ST_DATA:
protection = SP_READ|SP_WRITE;
break;
case ST_UDATA:
protection = SP_READ|SP_WRITE;
flags = SF_UNINITIALIZED;
data = NULL;
break;
}
add_section(ou,sec_name,data,size,type,flags|SF_ALLOC,
protection,MIN_ALIGNMENT,FALSE);
}
static void aout_make_sections(struct ObjectUnit *ou,struct aout_hdr *hdr,
int be)
/* creates up to three sections from an a.out file */
{
struct FFFuncs *ff = fff[ou->lnkfile->format];
uint32_t size;
if (size = read32(be,hdr->a_text))
aout_create_section(ou,ff,TEXTNAME,((uint8_t *)hdr)+aout_txtoffset(hdr,be),
size,ST_CODE);
if (size = read32(be,&hdr->a_data))
aout_create_section(ou,ff,DATANAME,((uint8_t *)hdr)+aout_datoffset(hdr,be),
size,ST_DATA);
if (size = read32(be,&hdr->a_bss))
aout_create_section(ou,ff,BSSNAME,((uint8_t *)hdr)+aout_bssoffset(hdr,be),
size,ST_UDATA);
}
static void check_strtab(struct LinkFile *lf,struct aout_hdr *hdr,int be)
{
char *strtab = ((char *)hdr) + aout_stroffset(hdr,be);
if (((uint8_t *)strtab < lf->data) || ((uint8_t *)strtab +
read32(be,(uint32_t *)strtab) > (lf->data + lf->length)))
error(85,lf->pathname,"string",lf->objname); /* illegal offset */
}
static char *get_symname(struct LinkFile *lf,struct aout_hdr *hdr,int be,
int32_t offset)
{
char *symname = ((char *)hdr) + aout_stroffset(hdr,be) + offset;
if (((uint8_t *)symname < lf->data) ||
((uint8_t *)symname > (lf->data + lf->length))) /* illegal offset? */
error(87,lf->pathname,offset,lf->objname);
return (symname);
}
static void aout_symbols(struct GlobalVars *gv,struct ObjectUnit *ou,
struct aout_hdr *hdr,int be)
/* reads all symbols from an a.out and converts them into internal fmt. */
{
struct LinkFile *lf = ou->lnkfile;
struct nlist32 *nlst = (struct nlist32 *)(((char *)hdr) +
aout_symoffset(hdr,be));
uint32_t symtabsize = read32(be,&hdr->a_syms);
uint32_t txtaddr = (GETMAGIC(hdr) == ZMAGIC) ? sizeof(struct aout_hdr) : 0;
uint32_t dataddr = read32(be,hdr->a_text);
uint32_t bssaddr = dataddr + read32(be,&hdr->a_data);
int i;
if (symtabsize == 0)
return; /* no symbols */
if (((uint8_t *)nlst < lf->data) ||
((uint8_t *)nlst + symtabsize > lf->data + lf->length))
error(85,lf->pathname,"symbol",lf->objname); /* illegal offset */
if (symtabsize % sizeof(struct nlist32) != 0) /* symtab sanity check */
error(86,lf->pathname,"symbol",lf->objname,sizeof(struct nlist32));
check_strtab(lf,hdr,be); /* strtab sanity check */
/* read the symbols */
for (i=0; i<(int)(symtabsize/sizeof(struct nlist32)); i++,nlst++) {
char *symname,*indirname = NULL;
uint8_t type=SYM_RELOC,objinfo,objbind;
uint32_t saddr=0,size=0;
uint32_t value=read32(be,&nlst->n_value);
struct Section *sec = NULL;
symname = get_symname(lf,hdr,be,read32(be,&nlst->n_strx));
switch (nlst->n_other & 0x0f) {
case AUX_FUNC:
case AUX_LABEL: /* @@@ what's label? */
objinfo = SYMI_FUNC;
break;
case AUX_OBJECT:
objinfo = SYMI_OBJECT;
break;
default:
objinfo = SYMI_NOTYPE;
break;
}
objbind = (nlst->n_type & N_EXT) ? SYMB_GLOBAL : SYMB_LOCAL;
switch ((nlst->n_other & 0xf0) >> 4) {
/* seems that local and global are not used in a.out... */
case BIND_LOCAL:
/*objbind = SYMB_LOCAL;*/
break;
case BIND_GLOBAL:
/*objbind = SYMB_GLOBAL;*/
break;
case BIND_WEAK:
objbind = SYMB_WEAK;
break;
default: /* illegal binding type */
error(88,lf->pathname,symname,(nlst->n_other&0xf0)>>4,lf->objname);
break;
}
if (nlst->n_type & N_STAB) {
/* debugging symbols */
if (gv->strip_symbols < STRIP_DEBUG) {
switch (nlst->n_type & N_TYPE) {
case N_TEXT:
if (!(sec = find_sect_type(ou,ST_CODE,SP_READ|SP_EXEC)))
sec = add_section(ou,TEXTNAME,NULL,0,ST_CODE,SF_ALLOC,
SP_READ|SP_EXEC,MIN_ALIGNMENT,FALSE);
saddr = txtaddr;
break;
case N_DATA:
if (!(sec = find_sect_type(ou,ST_DATA,SP_READ|SP_WRITE)))
sec = add_section(ou,DATANAME,NULL,0,ST_DATA,SF_ALLOC,
SP_READ|SP_WRITE,MIN_ALIGNMENT,FALSE);
saddr = dataddr;
break;
case N_BSS:
if (!(sec = find_sect_type(ou,ST_UDATA,SP_READ|SP_WRITE)))
sec = add_section(ou,BSSNAME,NULL,0,ST_UDATA,
SF_ALLOC|SF_UNINITIALIZED,SP_READ|SP_WRITE,
MIN_ALIGNMENT,FALSE);
saddr = bssaddr;
break;
}
addstabs(ou,sec,symname,nlst->n_type,nlst->n_other,
(int16_t)read16(be,&nlst->n_desc),value - saddr);
}
}
else {
/* normal symbols */
switch (nlst->n_type & (N_TYPE | N_EXT)) {
case N_WEAKU:
objbind = SYMB_WEAK;
/* fall through */
case N_UNDF: case N_UNDF | N_EXT:
if (value) {
/* undefd. symbol with a value is assumed to be a common symbol */
sec = common_section(gv,ou);
type = SYM_COMMON;
size = value;
value = MIN_ALIGNMENT;
}
/* ignore undefined symbols for now */
break;
/* assign a section for ABS and COMMON symbols, to prevent */
/* accidental NULL-pointer references */
case N_WEAKA:
objbind = SYMB_WEAK;
/* fall through */
case N_ABS: case N_ABS | N_EXT:
sec = abs_section(ou);
type = SYM_ABS;
break;
#if 0 /* @@@ N_UNDF is used instead? */
case N_COMM: case N_COMM | N_EXT:
sec = common_section(gv,ou);
type = SYM_COMMON;
size = value;
break;
#endif
case N_WEAKT:
objbind = SYMB_WEAK;
/* fall through */
case N_TEXT: case N_TEXT | N_EXT:
if (!(sec = find_sect_type(ou,ST_CODE,SP_READ|SP_EXEC)))
sec = add_section(ou,TEXTNAME,NULL,0,ST_CODE,SF_ALLOC,
SP_READ|SP_EXEC,MIN_ALIGNMENT,FALSE);
saddr = txtaddr;
break;
case N_WEAKD:
objbind = SYMB_WEAK;
/* fall through */
case N_DATA: case N_DATA | N_EXT:
if (!(sec = find_sect_type(ou,ST_DATA,SP_READ|SP_WRITE)))
sec = add_section(ou,DATANAME,NULL,0,ST_DATA,SF_ALLOC,
SP_READ|SP_WRITE,MIN_ALIGNMENT,FALSE);
saddr = dataddr;
break;
case N_WEAKB:
objbind = SYMB_WEAK;
/* fall through */
case N_BSS: case N_BSS | N_EXT:
if (!(sec = find_sect_type(ou,ST_UDATA,SP_READ|SP_WRITE)))
sec = add_section(ou,BSSNAME,NULL,0,ST_UDATA,
SF_ALLOC|SF_UNINITIALIZED,SP_READ|SP_WRITE,
MIN_ALIGNMENT,FALSE);
saddr = bssaddr;
break;
case N_INDR: case N_INDR | N_EXT:
sec = abs_section(ou);
type = SYM_INDIR;
indirname = get_symname(lf,hdr,be,
read32(be,&(nlst+1)->n_strx));
break;
case N_SIZE:
/* ignored */
error(96,lf->pathname,(int)value,lf->objname);
break;
case N_FN | N_EXT:
sec = abs_section(ou);
type = SYM_ABS;
objinfo = SYMI_FILE;
objbind = SYMB_LOCAL;
break;
default:
ierror("aout_symbols(): Symbol %s in %s has type %d, "
"which is currently not supported",
symname,lf->pathname,nlst->n_type&N_TYPE);
break;
}
if (sec) {
/* check for symbol size: following symbol has to be type = N_SIZE */
/* and the same symbol name */
if ((i+1)<(int)(symtabsize/sizeof(struct nlist32)) &&
((nlst+1)->n_type & N_TYPE) == N_SIZE) {
if (!strcmp(symname,get_symname(lf,hdr,be,
read32(be,&(nlst+1)->n_strx)))) {
i++; /* skip symbol */
nlst++;
size = read32(be,&nlst->n_value);
}
}
/* convert a.out specific file offset into a section offset */
value -= saddr;
/* add a new symbol definition */
if (objbind == SYMB_LOCAL) {
addlocsymbol(gv,sec,symname,indirname,(int32_t)value,
type,0,objinfo,size);
}
else {
addsymbol(gv,sec,symname,indirname,(int32_t)value,
type,0,objinfo,objbind,size,TRUE);
}
}
}
}
}
static void aout_newreloc(struct GlobalVars *gv,struct aout_hdr *hdr,
struct Section *sec,uint32_t saddr,uint32_t symidx,
bool xtern,uint8_t rtype,uint16_t size,
uint32_t offs,int be)
{
const char *fn = "aout_newreloc(): ";
struct ObjectUnit *ou = sec->obj;
struct LinkFile *lf = ou->lnkfile;
struct RelocInsert ri,ri2;
lword a;
/* read the addend from the relocation field */
if (rtype == R_AOUT_MOVEI) {
initRelocInsert(&ri,0,16,0xffff);
ri.next = initRelocInsert(&ri2,16,16,0xffff0000);
rtype = R_ABS;
}
else
initRelocInsert(&ri,0,size,-1);
a = readsection(gv,rtype,sec->data+offs,&ri);
if (xtern) {
/* relocation by an external reference to an unknown symbol */
char *strtab = ((char *)hdr) + aout_stroffset(hdr,be);
struct nlist32 *nlst = (struct nlist32 *)(((char *)hdr) +
aout_symoffset(hdr,be));
char *xrefname = strtab + read32(be,&nlst[symidx].n_strx);
if (rtype == R_PC) {
/* fix a.out specific PC-relative relocs */
a += (lword)saddr + (lword)offs;
}
if (nlst[symidx].n_type == N_EXT|N_UNDF)
addreloc_ri(sec,newreloc(gv,sec,xrefname,NULL,0,offs,rtype,a),&ri);
else
error(91,lf->pathname,xrefname,sec->name); /* illegal ext. ref. */
}
else {
/* local relocation */
struct Section *rsec = NULL;
uint32_t rsaddr = 0; /* reloc section base address in object file */
if (symidx & ~N_TYPE) /* illegal nlist type in relocation */
error(92,lf->pathname,symidx,sec->name,lf->objname,offs);
switch (symidx & N_TYPE) {
case N_TEXT:
if (!(rsec = find_sect_type(ou,ST_CODE,SP_READ|SP_EXEC)))
ierror("%sno .text for reloc found",fn);
rsaddr = 0;
break;
case N_DATA:
if (!(rsec = find_sect_type(ou,ST_DATA,SP_READ|SP_WRITE)))
ierror("%sno .data for reloc found",fn);
rsaddr = read32(be,hdr->a_text);
break;
case N_BSS:
if (!(rsec = find_sect_type(ou,ST_UDATA,SP_READ|SP_WRITE)))
ierror("%sno .bss for reloc found",fn);
rsaddr = read32(be,hdr->a_text) + read32(be,&hdr->a_data);
break;
default:
ierror("%slocal reloc with nlist type %lu is not supported",
fn,symidx&N_TYPE);
break;
}
/* fix addend for a.out */
switch (rtype) {
case R_ABS:
a -= (lword)rsaddr;
break;
case R_PC:
a += (lword)offs;
break;
case R_SD:
/* @@@ A local baserel relocation will not happen in standard a.out. */
/* A GOT base offset is always based on a symbol. But we use it here */
/* to support small data mode... */
a -= (lword)rsaddr;
break;
}
addreloc_ri(sec,newreloc(gv,sec,NULL,rsec,0,offs,rtype,a),&ri);
}
}
int aout_targetlink(struct GlobalVars *gv,struct LinkedSection *ls,
struct Section *s)
/* returns 1, if target requires the combination of the two sections, */
/* returns -1, if target doesn't want to combine them, */
/* returns 0, if target doesn't care - standard linking rules are used. */
{
/* a.out requires that all sections of type CODE or DATA or BSS */
/* will be combined, because there are only those three available! */
if (ls->type == s->type)
return (1);
return (0);
}
struct Symbol *aout_lnksym(struct GlobalVars *gv,struct Section *sec,
struct Reloc *xref)
/* Check for common a.out linker symbols. */
{
struct Symbol *sym;
int i;
if (!gv->dest_object) {
for (i=0; i<AOUTSTD_LNKSYMS; i++) {
if (!strcmp(aout_symnames[i],xref->xrefname)) {
sym = addlnksymbol(gv,aout_symnames[i],0,SYM_ABS,
SYMF_LNKSYM,SYMI_OBJECT,SYMB_GLOBAL,0);
sym->extra = i; /* for easy ident. in aout_setlnksym */
switch (i) {
case GOTSYM:
gv->got_base_name = aout_symnames[i];
sym->type = SYM_RELOC;
break;
case PLTSYM:
gv->got_base_name = aout_symnames[i];
sym->type = SYM_RELOC;
break;
case DYNAMICSYM:
break;
}
return (sym); /* new linker symbol created */
}
}
}
return (NULL);
}
void aout_setlnksym(struct GlobalVars *gv,struct Symbol *xdef)
/* Initialize common a.out linker symbol structure during resolve_xref() */
{
struct FFFuncs *tf = fff[gv->dest_format];
if (xdef->flags & SYMF_LNKSYM) {
switch (xdef->extra) {
case GOTSYM:
case PLTSYM:
case DYNAMICSYM:
/* @@@ FIXME! NOW! */
break;
}
xdef->flags &= ~SYMF_LNKSYM; /* do not init again */
}
}
void aoutstd_relocs(struct GlobalVars *gv,struct ObjectUnit *ou,
struct aout_hdr *hdr,int be,
struct relocation_info *reloc,uint32_t rsize,
struct Section *sec,uint32_t saddr)
/* reads all relocations in standard format for a section */
{
static uint16_t bsize[4] = { 8,16,32,64 };
struct LinkFile *lf = ou->lnkfile;
uint32_t mid = GETMID(hdr);
if (sec) {
int i;
if (((uint8_t *)reloc < lf->data) ||
(((uint8_t *)reloc)+rsize > lf->data + lf->length))
error(85,lf->pathname,"stdreloc",lf->objname); /* illegal offset */
if (rsize % sizeof(struct relocation_info) != 0) /* reloc sanity check */
error(86,lf->pathname,"stdreloc",lf->objname,
sizeof(struct relocation_info));
for (i=0; i<(rsize/sizeof(struct relocation_info)); i++,reloc++) {
uint32_t *info = &reloc->r_info;
uint32_t symnum = readbf(be,info,4,RELB_symbolnum,RELS_symbolnum);
int size = readbf(be,info,4,RSTDB_length,RSTDS_length);
int pcrel = readbf(be,info,4,RSTDB_pcrel,RSTDS_pcrel);
int baserel = readbf(be,info,4,RSTDB_baserel,RSTDS_baserel);
int jmptable = readbf(be,info,4,RSTDB_jmptable,RSTDS_jmptable);
int relative = readbf(be,info,4,RSTDB_relative,RSTDS_relative);
int copy = readbf(be,info,4,RSTDB_copy,RSTDS_copy);
int xtern = readbf(be,info,4,RSTDB_extern,RSTDS_extern);
uint8_t rtype;
if (!pcrel && !baserel && !jmptable && !relative && !copy) {
rtype = R_ABS;
}
else if (pcrel && !baserel && !jmptable && !relative && !copy) {
rtype = R_PC;
}
else if (baserel && !pcrel && !jmptable && !relative && !copy) {
rtype = R_SD;
}
else if (!mid && !pcrel && !baserel && !jmptable && !relative &&
copy && size==2) {
/* MID 0 and 32-bit COPY reloc may indicate a Jaguar GPU
MOVEI RISC-instruction, which has swapped 16-bit words */
rtype = R_AOUT_MOVEI;
if (gv->endianess < 0)
gv->endianess = _BIG_ENDIAN_; /* Jaguar is big-endian */
}
else
ierror("aoutstd_relocs(): %s (%s): Reloc type "
"<pcrel=%d len=%d extern=%d baserel=%d jmptab=%d "
"rel=%d copy=%d> in %s is currently not supported",
lf->pathname,lf->objname,pcrel,bsize[size],xtern,baserel,
jmptable,relative,copy,sec->name);
if (rtype) {
/* create a.out relocation */
aout_newreloc(gv,hdr,sec,saddr,symnum,xtern!=0,rtype,bsize[size],
read32(be,&reloc->r_address),be);
}
else {
/* illegal a.out relocation */
error(90,lf->pathname,sec->name,lf->objname,
(uint32_t)read32(be,&reloc->r_address),pcrel,size,xtern,
baserel,jmptable,relative,copy);
}
}
}
else if (rsize) {
/* no section for these relocations! */
error(89,lf->pathname,lf->objname);
}
}
void aoutstd_read(struct GlobalVars *gv,struct LinkFile *lf,
struct aout_hdr *hdr)
/* read an a.out file with standard relocations */
{
/*int so = (GETFLAGS(hdr)&EX_DPMASK) == (EX_DYNAMIC|EX_PIC);*/
int be;
struct ObjectUnit *u;
/* determine endianess */
if (fff[lf->format]->endianess < 0) {
if (gv->endianess < 0) {
/* unknown endianess, default to BE */
be = gv->endianess = host_endianess();
error(128,lf->pathname,endian_name[be]);
}
else
be = gv->endianess;
}
else
be = fff[lf->format]->endianess;
if (lf->type == ID_LIBARCH) { /* check ar-member for correct format */
if (!aout_check_ar_type(fff[lf->format],lf->pathname,hdr))
return; /* malformatted, so ignore */
}
u = create_objunit(gv,lf,lf->objname);
aout_make_sections(u,hdr,be); /* create up to 3 sections */
aout_symbols(gv,u,hdr,be); /* read all symbols */
aoutstd_relocs(gv,u,hdr,be,(struct relocation_info *) /* .text relocs */
(((uint8_t *)hdr)+aout_treloffset(hdr,be)),
read32(be,&hdr->a_trsize),
find_sect_type(u,ST_CODE,SP_READ|SP_EXEC),0);
aoutstd_relocs(gv,u,hdr,be,(struct relocation_info *) /* .data relocs */
(((uint8_t *)hdr)+aout_dreloffset(hdr,be)),
read32(be,&hdr->a_drsize),
find_sect_type(u,ST_DATA,SP_READ|SP_WRITE),
read32(be,hdr->a_text));
/* add new object unit to the appropriate list */
add_objunit(gv,u,FALSE);
}
void aoutstd_readconv(struct GlobalVars *gv,struct LinkFile *lf)
/* Read a.out executable / object / shared obj. with standard relocs */
{
if (lf->type == ID_LIBARCH) {
if (ar_init(&ai,(char *)lf->data,lf->length,lf->filename)) {
while (ar_extract(&ai)) {
lf->objname = allocstring(ai.name);
aoutstd_read(gv,lf,(struct aout_hdr *)ai.data);
}
}
else
ierror("aoutstd_readconv(): archive %s corrupted since last access",
lf->pathname);
}
else {
lf->objname = lf->filename;
aoutstd_read(gv,lf,(struct aout_hdr *)lf->data);
}
}
/*****************************************************************/
/* Write a.out */
/*****************************************************************/
unsigned long aout_headersize(struct GlobalVars *gv)
{
return (sizeof(struct aout_hdr));
}
static int aout_sectindex(struct LinkedSection **sections,
struct LinkedSection *ls)
/* return index (0,1,2 = .text,.data,.bss) of 'ls' */
{
int sec;
for (sec=0; sec<3; sec++) {
if (sections[sec] == ls)
break;
}
if (sec>=3)
ierror("aout_sectindex(): Section %s not found in list",ls->name);
return (sec);
}
void aout_initwrite(struct GlobalVars *gv,struct LinkedSection **sections)
{
static const char *fn = "aout_initwrite(): ";
struct LinkedSection *ls;
initlist(&aoutstrlist.l);
aoutstrlist.hashtab = alloczero(STRHTABSIZE*sizeof(struct StrTabNode *));
aoutstrlist.nextoffset = 4; /* first string is always at offset 4 */
initlist(&aoutsymlist.l);
aoutsymlist.hashtab = alloczero(SYMHTABSIZE*sizeof(struct SymbolNode *));
aoutsymlist.nextindex = 0;
initlist(&treloclist);
initlist(&dreloclist);
get_text_data_bss(gv,sections);
}
static uint8_t aout_getinfo(struct Symbol *sym)
{
uint8_t type;
switch (sym->info) {
case SYMI_NOTYPE:
case SYMI_FILE:
case SYMI_SECTION: /* this will be ignored later */
type = AUX_UNKNOWN;
break;
case SYMI_OBJECT:
type = AUX_OBJECT;
break;
case SYMI_FUNC:
type = AUX_FUNC;
break;
default:
ierror("aout_getinfo(): Illegal symbol info: %d",(int)sym->info);
break;
}
return (type);
}
static uint8_t aout_getbind(struct Symbol *sym)
{
uint8_t bind;
switch (sym->bind) {
case SYMB_LOCAL:
bind = BIND_LOCAL;
break;
case SYMB_GLOBAL:
bind = BIND_GLOBAL;
break;
case SYMB_WEAK:
bind = BIND_WEAK;
break;
default:
ierror("aout_getbind(): Illegal symbol binding: %d",(int)sym->bind);
break;
}
return (bind);
}
static uint32_t aout_addstr(const char *s)
/* add a new symbol name to the string table and return its offset */
{
struct StrTabNode **chain = &aoutstrlist.hashtab[elf_hash(s)%STRHTABSIZE];
struct StrTabNode *sn;
if (*s == '\0')
return (0);
/* search string in hash table */
while (sn = *chain) {
if (!strcmp(s,sn->str))
return (sn->offset); /* it's already in, return offset */
chain = &sn->hashchain;
}
/* new string table entry */
*chain = sn = alloc(sizeof(struct StrTabNode));
sn->hashchain = NULL;
sn->str = s;
sn->offset = aoutstrlist.nextoffset;
addtail(&aoutstrlist.l,&sn->n);
aoutstrlist.nextoffset += (uint32_t)strlen(s) + 1;
return (sn->offset);
}
static uint32_t aout_addsym(const char *name,uint32_t value,uint8_t bind,
uint8_t info,uint8_t type,int16_t desc,int be)
/* add a new symbol, return its symbol table index */
{
struct SymbolNode **chain;
struct SymbolNode *sym;
if (name == NULL)
name = noname;
chain = &aoutsymlist.hashtab[elf_hash(name)%SYMHTABSIZE];
while (sym = *chain)
chain = &sym->hashchain;
/* new symbol table entry */
*chain = sym = alloczero(sizeof(struct SymbolNode));
sym->name = name;
sym->index = aoutsymlist.nextindex++;
write32(be,&sym->s.n_strx,aout_addstr(name));
sym->s.n_type = type;
/* @@@ GNU binutils don't use BIND_LOCAL/GLOBAL in a.out files! We do! */
sym->s.n_other = ((bind&0xf)<<4) | (info&0xf);
write16(be,&sym->s.n_desc,desc);
write32(be,&sym->s.n_value,value);
addtail(&aoutsymlist.l,&sym->n);
return (sym->index);
}
static void aout_symconvert(struct GlobalVars *gv,struct Symbol *sym,
uint8_t symbind,uint8_t syminfo,
struct LinkedSection **ls,int sec,int be)
/* convert vlink symbol into a.out symbol(s) */
{
uint32_t val = (uint32_t)sym->value;
uint32_t size = sym->size;
uint8_t ext = (symbind == BIND_GLOBAL) ? N_EXT : 0;
uint8_t type = 0;
if (sym->info == SYMI_SECTION) {
return; /* section symbols are ignored in a.out! */
}
else if (sym->info == SYMI_FILE) {
type = N_FN | N_EXT; /* special case: file name symbol */
size = 0;
}
else {
if (symbind == BIND_WEAK) {
switch (sym->type) {
case SYM_ABS:
type = N_WEAKA;
break;
case SYM_RELOC:
type = weaktype[sec];
break;
default:
ierror("aout_symconvert(): Illegal weak symbol type: %d",
(int)sym->type);
break;
}
}
else {
switch (sym->type) {
case SYM_ABS:
type = N_ABS | ext;
break;
case SYM_RELOC:
type = sectype[sec] | ext;
break;
case SYM_COMMON:
#if 0 /* GNU binutils prefers N_UNDF with value!=0 instead of N_COMM! */
type = N_COMM | ext;
#else
type = N_UNDF | N_EXT;
#endif
val = sym->size;
size = 0;
break;
case SYM_INDIR:
aout_addsym(sym->name,0,symbind,0,N_INDR|ext,0,be);
aout_addsym(sym->indir_name,0,0,0,N_UNDF|N_EXT,0,be);
return;
default:
ierror("aout_symconvert(): Illegal symbol type: %d",(int)sym->type);
break;
}
}
}
aout_addsym(sym->name,val,symbind,syminfo,type,0,be);
if (size) {
/* append N_SIZE symbol declaring the previous symbol's size */
aout_addsym(sym->name,size,symbind,syminfo,N_SIZE,0,be);
}
}
void aout_addsymlist(struct GlobalVars *gv,struct LinkedSection **ls,
uint8_t bind,uint8_t type,int be)
/* add all symbols with specified bind and type to the a.out symbol list */
{
int i;
for (i=0; i<3; i++) {
if (ls[i]) {
struct Symbol *sym = (struct Symbol *)ls[i]->symbols.first;
struct Symbol *nextsym;
while (nextsym = (struct Symbol *)sym->n.next) {
uint8_t syminfo = aout_getinfo(sym);
uint8_t symbind = aout_getbind(sym);
if (symbind == bind && (!type || (syminfo == type))) {
if (!discard_symbol(gv,sym)) {
remnode(&sym->n);
/* add new symbol(s) */
aout_symconvert(gv,sym,symbind,syminfo,ls,i,be);
}
}
sym = nextsym;
}
}
}
}
void aout_debugsyms(struct GlobalVars *gv,bool be)