/*
* Converts a pointer into a function name and an offset from the start of
* this function. Returns NULL if it doesn't know.
* Wildly inefficient - we ought to use a binary search.
*/
static char *get_name(unsigned long laddr, unsigned long *diff,
int *frameoffset) {
unsigned long i;
SYMR symbol;
PDR procp;
char *cp;
static LDFILE *ldp = NULL;
/* Read the LDFILE structure */
if (!ldp) {
if (NULL == (ldp = ldopen(prog_name, NULL))) {
return NULL;
}
}
/* Maybe it's stripped */
if (!SYMTAB(ldp))
return NULL;
/* Loop through the procedure data to find the correct address */
for (i = 0; i < SYMHEADER(ldp).ipdMax; i++) {
if (FAILURE == ldgetpd(ldp, i, &procp))
continue;
if (laddr < procp.adr)
break;
}
if (--i < 0)
return NULL;
/* Read the symbol entry and then the name of this procedure */
ldgetpd(ldp, i, &procp);
*diff = laddr - procp.adr;
if (FAILURE == ldtbread(ldp, procp.isym, &symbol))
return NULL;
*frameoffset = procp.frameoffset;
cp = ldgetname(ldp, &symbol);
/* printf("Function=%s frameoffset=%d, regoff=%d, fregoff=%d\n",
cp, procp.frameoffset, procp.regoffset, procp.fregoffset); */
return cp;
}
/*
* Converts a pointer into a function name and an offset from the start of
* this function. Returns NULL if it doesn't know.
* Wildly inefficient - we ought to use a binary search.
*/
static char *get_name(unsigned long laddr, signed long *diff) {
static LDFILE *ldp = NULL;
unsigned long i;
SYMR symbol;
PDR procp;
/* Read the LDFILE structure */
if (!ldp) {
if (NULL == (ldp = ldopen(prog_name, NULL))) {
return NULL;
}
}
/* Maybe it's stripped */
if (!SYMTAB(ldp))
return NULL;
/* Loop through the procedure data to find the correct address */
for (i = 0; i < SYMHEADER(ldp).ipdMax; i++) {
if (FAILURE == ldgetpd(ldp, i, &procp))
continue;
if (laddr < procp.adr)
break;
}
if (--i < 0)
return NULL;
/* Read the symbol entry and then the name of this procedure */
ldgetpd(ldp, i, &procp);
*diff = laddr - procp.adr;
if (FAILURE == ldtbread(ldp, procp.isym, &symbol))
return NULL;
return ldgetname(ldp, &symbol);
}
void leaky::readSymbols(const char *fileName)
{
LDFILE *ldptr;
ldptr = ldopen(fileName, nullptr);
if (!ldptr) {
fprintf(stderr, "%s: unable to open \"%s\"\n", applicationName,
fileName);
exit(-1);
}
if (PSYMTAB(ldptr) == 0) {
fprintf(stderr, "%s: \"%s\": has no symbol table\n", applicationName,
fileName);
exit(-1);
}
long isymMax = SYMHEADER(ldptr).isymMax;
long iextMax = SYMHEADER(ldptr).iextMax;
long iMax = isymMax + iextMax;
long alloced = 10000;
Symbol* syms = (Symbol*) malloc(sizeof(Symbol) * 10000);
Symbol* sp = syms;
Symbol* last = syms + alloced;
SYMR symr;
for (long isym = 0; isym < iMax; isym++) {
if (ldtbread(ldptr, isym, &symr) != SUCCESS) {
fprintf(stderr, "%s: can't read symbol #%d\n", applicationName,
isym);
exit(-1);
}
if (isym < isymMax) {
if ((symr.st == stStaticProc)
|| ((symr.st == stProc) &&
((symr.sc == scText) || (symr.sc == scAbs)))
|| ((symr.st == stBlock) &&
(symr.sc == scText))) {
// Text symbol. Set name field to point to the symbol name
sp->name = Demangle(ldgetname(ldptr, &symr));
sp->address = symr.value;
sp++;
if (sp >= last) {
long n = alloced + 10000;
syms = (Symbol*)
realloc(syms, (size_t) (sizeof(Symbol) * n));
last = syms + n;
sp = syms + alloced;
alloced = n;
}
}
}
}
int interesting = sp - syms;
if (!quiet) {
printf("Total of %d symbols\n", interesting);
}
usefulSymbols = interesting;
externalSymbols = syms;
}
void Object::load_object(bool sharedLibrary) {
char* file = strdup(file_.c_str());
bool did_open = false, success=true, text_read=false;
LDFILE *ldptr = NULL;
HDRR sym_hdr;
pCHDRR sym_tab_ptr = NULL;
long index=0;
SYMR symbol;
unsigned short sectindex=1;
SCNHDR secthead;
filehdr fhdr;
unsigned nsymbols;
pdvector<Symbol> allSymbols;
pdvector<Address> all_addr(9, 0);
pdvector<long> all_size(9, 0);
pdvector<bool> all_dex(9, false);
pdvector<long> all_disk(9, 0);
if (!(ldptr = ldopen(file, ldptr))) {
log_perror(err_func_, file);
success = false;
bperr("failed open\n");
free(file);
return;
}
did_open = true;
if (TYPE(ldptr) != ALPHAMAGIC) {
bperr( "%s is not an alpha executable\n", file);
success = false;
bperr("failed magic region\n");
ldclose(ldptr);
free(file);
return;
}
// Read the text and data sections
fhdr = HEADER(ldptr);
unsigned short fmax = fhdr.f_nscns;
dynamicallyLinked = false;
// Life would be so much easier if there were a guaranteed order for
// these sections. But the man page makes no mention of it.
while (sectindex < fmax) {
if (ldshread(ldptr, sectindex, §head) == SUCCESS) {
// cout << "Section: " << secthead.s_name << "\tStart: " << secthead.s_vaddr
// << "\tEnd: " << secthead.s_vaddr + secthead.s_size << endl;
if (!P_strcmp(secthead.s_name, ".text")) {
code_len_ = (Word) secthead.s_size;
Word *buffer = new Word[code_len_+1];
code_ptr_ = buffer;
code_off_ = (Address) secthead.s_vaddr;
if (!obj_read_section(secthead, ldptr, buffer)) {
success = false;
bperr("failed text region\n");
ldclose(ldptr);
free(file);
return;
}
text_read = true;
} else if (!P_strcmp(secthead.s_name, ".data")) {
if (secthead.s_vaddr && secthead.s_scnptr) {
all_addr[K_D_INDEX] = secthead.s_vaddr;
all_size[K_D_INDEX] = secthead.s_size;
all_dex[K_D_INDEX] = true;
all_disk[K_D_INDEX] = secthead.s_scnptr;
} else {
bperr("failed data region\n");
success = false;
ldclose(ldptr);
free(file);
return;
}
} else if (!P_strcmp(secthead.s_name, ".xdata")) {
if (secthead.s_vaddr && secthead.s_scnptr) {
all_addr[K_XD_INDEX] = secthead.s_vaddr;
all_size[K_XD_INDEX] = secthead.s_size;
all_dex[K_XD_INDEX] = true;
all_disk[K_XD_INDEX] = secthead.s_scnptr;
}
} else if (!P_strcmp(secthead.s_name, ".sdata")) {
if (secthead.s_vaddr && secthead.s_scnptr) {
all_addr[K_SD_INDEX] = secthead.s_vaddr;
all_size[K_SD_INDEX] = secthead.s_size;
all_dex[K_SD_INDEX] = true;
all_disk[K_SD_INDEX] = secthead.s_scnptr;
}
} else if (!P_strcmp(secthead.s_name, ".rdata")) {
if (secthead.s_vaddr && secthead.s_scnptr) {
all_addr[K_RD_INDEX] = secthead.s_vaddr;
all_size[K_RD_INDEX] = secthead.s_size;
all_dex[K_RD_INDEX] = true;
all_disk[K_RD_INDEX] = secthead.s_scnptr;
}
} else if (!P_strcmp(secthead.s_name, ".lit4")) {
if (secthead.s_vaddr && secthead.s_scnptr) {
all_addr[K_L4_INDEX] = secthead.s_vaddr;
all_size[K_L4_INDEX] = secthead.s_size;
all_dex[K_L4_INDEX] = true;
all_disk[K_L4_INDEX] = secthead.s_scnptr;
}
} else if (!P_strcmp(secthead.s_name, ".lita")) {
if (secthead.s_vaddr && secthead.s_scnptr) {
all_addr[K_LA_INDEX] = secthead.s_vaddr;
all_size[K_LA_INDEX] = secthead.s_size;
all_dex[K_LA_INDEX] = true;
all_disk[K_LA_INDEX] = secthead.s_scnptr;
}
} else if (!P_strcmp(secthead.s_name, ".rconst")) {
if (secthead.s_vaddr && secthead.s_scnptr) {
all_addr[K_RC_INDEX] = secthead.s_vaddr;
all_size[K_RC_INDEX] = secthead.s_size;
all_dex[K_RC_INDEX] = true;
all_disk[K_RC_INDEX] = secthead.s_scnptr;
}
} else if (!P_strcmp(secthead.s_name, ".lit8")) {
if (secthead.s_vaddr && secthead.s_scnptr) {
all_addr[K_L8_INDEX] = secthead.s_vaddr;
all_size[K_L8_INDEX] = secthead.s_size;
all_dex[K_L8_INDEX] = true;
all_disk[K_L8_INDEX] = secthead.s_scnptr;
}
} else if (!P_strncmp(secthead.s_name, ".dynamic", 8)) {
// a section .dynamic implies the program is dynamically linked
dynamicallyLinked = true;
}
} else {
success = false;
bperr("failed header region\n");
ldclose(ldptr);
free(file);
return;
}
sectindex++;
}
if (!text_read) {
success = false;
bperr("failed text region\n");
ldclose(ldptr);
free(file);
return;
}
// I am assuming that .data comes before all other data sections
// I will include all other contiguous data sections
// Determine the size of the data section(s)
if (all_disk[K_D_INDEX]) {
if (!find_data_region(all_addr, all_size, all_disk,
data_len_, data_off_)) {
success = false;
bperr("failed find data region\n");
ldclose(ldptr);
free(file);
return;
}
}
// Now read in the data from the assorted data regions
Word *buffer = new Word[data_len_+1];
data_ptr_ = buffer;
if (!read_data_region(all_addr, all_size, all_disk,
data_len_, data_off_, buffer, ldptr)) {
success = false;
bperr("failed read data region\n");
ldclose(ldptr);
free(file);
return;
}
// COFF doesn't have segments, so the entire code/data sections are valid
code_vldS_ = code_off_;
code_vldE_ = code_off_ + code_len_;
data_vldS_ = data_off_;
data_vldE_ = data_off_ + code_len_;
// Check for the symbol table
if (!(sym_tab_ptr = PSYMTAB(ldptr))) {
success = false;
bperr("failed check for symbol table - object may be strip'd!\n");
ldclose(ldptr);
free(file);
return;
}
// Read the symbol table
sym_hdr = SYMHEADER(ldptr);
if (sym_hdr.magic != magicSym) {
success = false;
bperr("failed check for magic symbol\n");
ldclose(ldptr);
free(file);
return;
}
if (!(sym_tab_ptr = SYMTAB(ldptr))) {
success = false;
bperr("failed read symbol table\n");
ldclose(ldptr);
free(file);
return;
}
if (LDSWAP(ldptr)) {
// These bytes are swapped
// supposedly libsex.a will unswap them
assert(0);
}
pdstring module = "DEFAULT_MODULE";
if (sharedLibrary) {
module = file_;
allSymbols.push_back(Symbol(module, module, Symbol::PDST_MODULE,
Symbol::SL_GLOBAL, (Address) 0, false));
} else {
module = "DEFAULT_MODULE";
}
pdstring name = "DEFAULT_SYMBOL";
int moduleEndIdx = -1;
dictionary_hash<pdstring, int> fcnNames(pdstring::hash);
while (ldtbread(ldptr, index, &symbol) == SUCCESS) {
// TODO -- when global?
Symbol::SymbolLinkage linkage = Symbol::SL_GLOBAL;
Symbol::SymbolType type = Symbol::PDST_UNKNOWN;
bool st_kludge = false;
bool sym_use = true;
char *name = ldgetname(ldptr, &symbol);
char prettyName[1024];
switch(symbol.st) {
case stProc:
case stStaticProc:
// Native C++ name demangling.
MLD_demangle_string(name, prettyName, 1024,
MLD_SHOW_DEMANGLED_NAME | MLD_NO_SPACES);
if (strchr(prettyName, '('))
*strchr(prettyName, '(') = 0;
name = prettyName;
if (symbol.sc == scText && !fcnNames.defines(name)) {
type = Symbol::PDST_FUNCTION;
fcnNames[name] = 1;
}
else
sym_use = false;
break;
case stGlobal:
case stConstant:
case stStatic:
switch(symbol.sc) {
case scData:
case scSData:
case scBss:
case scSBss:
case scRData:
case scRConst:
case scTlsData:
case scTlsBss:
type = Symbol::PDST_OBJECT;
break;
default:
sym_use = false;
}
break;
case stLocal:
case stParam:
linkage = Symbol::SL_LOCAL;
switch(symbol.sc) {
case scAbs:
case scRegister:
case scVar:
case scVarRegister:
case scUnallocated:
type = Symbol::PDST_OBJECT;
break;
case scData:
case scSData:
case scBss:
case scSBss:
case scRConst:
case scRData:
//Parameter is static var. Don't know what to do
if (symbol.st == stParam)
type = Symbol::PDST_OBJECT;
else
sym_use = false;
break;
default:
sym_use = false;
}
break;
case stTypedef:
case stBase: //Base class
case stTag: //C++ class, structure or union
if (symbol.sc == scInfo)
type = Symbol::PDST_OBJECT;
else
sym_use = false;
break;
case stFile:
if (!sharedLibrary) {
module = ldgetname(ldptr, &symbol); assert(module.length());
type = Symbol::PDST_MODULE;
moduleEndIdx = symbol.index - 1;
//Detect the compiler type by searching libgcc.
if (strstr(module.c_str(), "libgcc"))
GCC_COMPILED = true;
}
break;
case stLabel:
// For stLabel/scText combinations, if the symbol address falls
// within the text section and has a valid name, process it as
// a function.
if (symbol.sc == scText &&
code_vldS_ <= (unsigned) symbol.value && (unsigned) symbol.value < code_vldE_ &&
name && *name && !fcnNames.defines(name)) {
// Native C++ name demangling.
// Keep this in sync with stProc case above.
MLD_demangle_string(name, prettyName, 1024,
MLD_SHOW_DEMANGLED_NAME | MLD_NO_SPACES);
if (strchr(prettyName, '('))
*strchr(prettyName, '(') = 0;
name = prettyName;
type = Symbol::PDST_FUNCTION;
fcnNames[name] = 1;
} else {
sym_use = false;
}
break;
case stEnd:
if (index == moduleEndIdx)
module = "DEFAULT_MODULE";
sym_use = false;
break;
default:
sym_use = false;
}
// Skip eCoff encoded stab string. Functions and global variable
// addresses will still be found via the external symbols.
if (P_strchr(name, ':'))
sym_use = false;
// cout << index << "\t" << name << "\t" << StName(symbol.st) << "\t" << ScName(symbol.sc) << "\t" << symbol.value << "\n";
index++;
if (sym_use) {
// cout << index << "\t" << module << "\t" << name << "\t" << type << "\t" << symbol.value << "\n";
allSymbols.push_back(Symbol(name, module, type, linkage,
(Address) symbol.value, st_kludge));
}
} //while
VECTOR_SORT(allSymbols,symbol_compare);
// find the function boundaries
nsymbols = allSymbols.size();
//Insert global symbols
for (unsigned u = 0; u < nsymbols; u++) {
unsigned size = 0;
if (allSymbols[u].type() == Symbol::PDST_FUNCTION) {
unsigned v = u+1;
while (v < nsymbols) {
// The .ef below is a special symbol that gcc puts in to
// mark the end of a function.
if (allSymbols[v].addr() != allSymbols[u].addr() &&
(allSymbols[v].type() == Symbol::PDST_FUNCTION ||
allSymbols[v].name() == ".ef"))
break;
v++;
}
if (v < nsymbols) {
size = (unsigned)allSymbols[v].addr()
- (unsigned)allSymbols[u].addr();
} else {
size = (unsigned)(code_off_+code_len_)
- (unsigned)allSymbols[u].addr();
}
}
if (allSymbols[u].linkage() != Symbol::SL_LOCAL) {
symbols_[allSymbols[u].name()].push_back(
Symbol(allSymbols[u].name(), allSymbols[u].module(),
allSymbols[u].type(), allSymbols[u].linkage(),
allSymbols[u].addr(), allSymbols[u].kludge(), size) );
}
}
//Insert local symbols (Do we need this?)
for (unsigned u = 0; u < nsymbols; u++) {
if ( (allSymbols[u].linkage() == Symbol::SL_LOCAL) &&
(!symbols_.defines(allSymbols[u].name())) ) {
symbols_[allSymbols[u].name()].push_back(
Symbol(allSymbols[u].name(), allSymbols[u].module(),
allSymbols[u].type(), allSymbols[u].linkage(),
allSymbols[u].addr(), allSymbols[u].kludge(), 0) );
}
}
if (did_open && (ldclose(ldptr) == FAILURE)) {
log_perror(err_func_, "close");
}
free(file);
}