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ftmemsim-valgrind/coregrind/m_debuginfo/readelf.c
Julian Seward a043f0a060 Remove the assumption, in m_debuginfo, that each address is associated 
with only one symbol.  Instead, allow an address to have arbitrarily
many names.  This reflects reality better, particularly for systemy
libraries such as glibc and ld.so, and is background work needed for
fixing #275284.  This is not in itself a fix for #275284.  A followup
commit to un-break compilation on OSX will follow shortly.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@11981
2011-08-15 09:42:34 +00:00

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/*--------------------------------------------------------------------*/
/*--- Reading of syms & debug info from ELF .so/executable files. ---*/
/*--- readelf.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2000-2010 Julian Seward
jseward@acm.org
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
*/
#if defined(VGO_linux)
#include "pub_core_basics.h"
#include "pub_core_vki.h"
#include "pub_core_debuginfo.h"
#include "pub_core_libcbase.h"
#include "pub_core_libcprint.h"
#include "pub_core_libcassert.h"
#include "pub_core_libcfile.h"
#include "pub_core_aspacemgr.h" /* for mmaping debuginfo files */
#include "pub_core_machine.h" /* VG_ELF_CLASS */
#include "pub_core_options.h"
#include "pub_core_oset.h"
#include "pub_core_tooliface.h" /* VG_(needs) */
#include "pub_core_xarray.h"
#include "priv_misc.h" /* dinfo_zalloc/free/strdup */
#include "priv_d3basics.h"
#include "priv_tytypes.h"
#include "priv_storage.h"
#include "priv_readelf.h" /* self */
#include "priv_readdwarf.h" /* 'cos ELF contains DWARF */
#include "priv_readdwarf3.h"
#include "priv_readstabs.h" /* and stabs, if we're unlucky */
/* --- !!! --- EXTERNAL HEADERS start --- !!! --- */
#include <elf.h>
/* --- !!! --- EXTERNAL HEADERS end --- !!! --- */
/*------------------------------------------------------------*/
/*--- 32/64-bit parameterisation ---*/
/*------------------------------------------------------------*/
/* For all the ELF macros and types which specify '32' or '64',
select the correct variant for this platform and give it
an 'XX' name. Then use the 'XX' variant consistently in
the rest of this file.
*/
#if VG_WORDSIZE == 4
# define ElfXX_Ehdr Elf32_Ehdr
# define ElfXX_Shdr Elf32_Shdr
# define ElfXX_Phdr Elf32_Phdr
# define ElfXX_Nhdr Elf32_Nhdr
# define ElfXX_Sym Elf32_Sym
# define ElfXX_Off Elf32_Off
# define ElfXX_Word Elf32_Word
# define ElfXX_Addr Elf32_Addr
# define ElfXX_Dyn Elf32_Dyn
# define ELFXX_ST_BIND ELF32_ST_BIND
# define ELFXX_ST_TYPE ELF32_ST_TYPE
#elif VG_WORDSIZE == 8
# define ElfXX_Ehdr Elf64_Ehdr
# define ElfXX_Shdr Elf64_Shdr
# define ElfXX_Phdr Elf64_Phdr
# define ElfXX_Nhdr Elf64_Nhdr
# define ElfXX_Sym Elf64_Sym
# define ElfXX_Off Elf64_Off
# define ElfXX_Word Elf64_Word
# define ElfXX_Addr Elf64_Addr
# define ElfXX_Dyn Elf64_Dyn
# define ELFXX_ST_BIND ELF64_ST_BIND
# define ELFXX_ST_TYPE ELF64_ST_TYPE
#else
# error "VG_WORDSIZE should be 4 or 8"
#endif
/*------------------------------------------------------------*/
/*--- ---*/
/*--- Read symbol table and line info from ELF files. ---*/
/*--- ---*/
/*------------------------------------------------------------*/
/* readelf.c parses ELF files and acquires symbol table info from
them. It calls onwards to readdwarf.c to read DWARF2/3 line number
and call frame info found. */
/* Identify an ELF object file by peering at the first few bytes of
it. */
Bool ML_(is_elf_object_file)( void* image, SizeT n_image )
{
ElfXX_Ehdr* ehdr = (ElfXX_Ehdr*)image;
Int ok = 1;
if (n_image < sizeof(ElfXX_Ehdr))
return False;
ok &= (ehdr->e_ident[EI_MAG0] == 0x7F
&& ehdr->e_ident[EI_MAG1] == 'E'
&& ehdr->e_ident[EI_MAG2] == 'L'
&& ehdr->e_ident[EI_MAG3] == 'F');
ok &= (ehdr->e_ident[EI_CLASS] == VG_ELF_CLASS
&& ehdr->e_ident[EI_DATA] == VG_ELF_DATA2XXX
&& ehdr->e_ident[EI_VERSION] == EV_CURRENT);
ok &= (ehdr->e_type == ET_EXEC || ehdr->e_type == ET_DYN);
ok &= (ehdr->e_machine == VG_ELF_MACHINE);
ok &= (ehdr->e_version == EV_CURRENT);
ok &= (ehdr->e_shstrndx != SHN_UNDEF);
ok &= (ehdr->e_shoff != 0 && ehdr->e_shnum != 0);
ok &= (ehdr->e_phoff != 0 && ehdr->e_phnum != 0);
if (ok)
return True;
else
return False;
}
/* Show a raw ELF symbol, given its in-image address and name. */
static
void show_raw_elf_symbol ( Int i,
ElfXX_Sym* sym, Char* sym_name, Addr sym_svma,
Bool ppc64_linux_format )
{
HChar* space = ppc64_linux_format ? " " : "";
VG_(printf)("raw symbol [%4d]: ", i);
switch (ELFXX_ST_BIND(sym->st_info)) {
case STB_LOCAL: VG_(printf)("LOC "); break;
case STB_GLOBAL: VG_(printf)("GLO "); break;
case STB_WEAK: VG_(printf)("WEA "); break;
case STB_LOPROC: VG_(printf)("lop "); break;
case STB_HIPROC: VG_(printf)("hip "); break;
default: VG_(printf)("??? "); break;
}
switch (ELFXX_ST_TYPE(sym->st_info)) {
case STT_NOTYPE: VG_(printf)("NOT "); break;
case STT_OBJECT: VG_(printf)("OBJ "); break;
case STT_FUNC: VG_(printf)("FUN "); break;
case STT_SECTION: VG_(printf)("SEC "); break;
case STT_FILE: VG_(printf)("FIL "); break;
case STT_LOPROC: VG_(printf)("lop "); break;
case STT_HIPROC: VG_(printf)("hip "); break;
default: VG_(printf)("??? "); break;
}
VG_(printf)(": svma %#010lx, %ssz %4ld %s\n",
sym_svma, space, sym->st_size + 0UL,
( sym->st_name ? sym_name : (Char*)"NONAME" ) );
}
/* Decide whether SYM is something we should collect, and if so, copy
relevant info to the _OUT arguments. For {x86,amd64,ppc32}-linux
this is straightforward - the name, address, size are copied out
unchanged.
There is a bit of a kludge re data symbols (see KLUDGED BSS CHECK
below): we assume that the .bss is mapped immediately after .data,
and so accept any data symbol which exists in the range [start of
.data, size of .data + size of .bss). I don't know if this is
really correct/justifiable, or not.
For ppc64-linux it's more complex. If the symbol is seen to be in
the .opd section, it is taken to be a function descriptor, and so
a dereference is attempted, in order to get hold of the real entry
point address. Also as part of the dereference, there is an attempt
to calculate the TOC pointer (R2 value) associated with the symbol.
To support the ppc64-linux pre-"dotless" ABI (prior to gcc 4.0.0),
if the symbol is seen to be outside the .opd section and its name
starts with a dot, an .opd deference is not attempted, and no TOC
pointer is calculated, but the the leading dot is removed from the
name.
As a result, on ppc64-linux, the caller of this function may have
to piece together the real size, address, name of the symbol from
multiple calls to this function. Ugly and confusing.
*/
static
Bool get_elf_symbol_info (
/* INPUTS */
struct _DebugInfo* di, /* containing DebugInfo */
ElfXX_Sym* sym, /* ELF symbol */
Char* sym_name, /* name */
Addr sym_svma, /* address as stated in the object file */
Bool symtab_in_debug, /* symbol table is in the debug file */
UChar* opd_img, /* oimage of .opd sec (ppc64-linux only) */
PtrdiffT opd_bias, /* for biasing AVMAs found in .opd */
/* OUTPUTS */
Char** sym_name_out, /* name we should record */
Addr* sym_avma_out, /* addr we should record */
Int* sym_size_out, /* symbol size */
Addr* sym_tocptr_out, /* ppc64-linux only: R2 value to be
used on entry */
Bool* from_opd_out, /* ppc64-linux only: did we deref an
.opd entry? */
Bool* is_text_out, /* is this a text symbol? */
Bool* is_ifunc /* is this a STT_GNU_IFUNC function ?*/
)
{
Bool plausible;
# if defined(VGP_ppc64_linux)
Bool is_in_opd;
# endif
Bool in_text, in_data, in_sdata, in_rodata, in_bss, in_sbss;
Addr text_svma, data_svma, sdata_svma, rodata_svma, bss_svma, sbss_svma;
PtrdiffT text_bias, data_bias, sdata_bias, rodata_bias, bss_bias, sbss_bias;
/* Set defaults */
*sym_name_out = sym_name;
*sym_avma_out = sym_svma; /* we will bias this shortly */
*is_text_out = True;
*sym_size_out = (Int)sym->st_size;
*sym_tocptr_out = 0; /* unknown/inapplicable */
*from_opd_out = False;
*is_ifunc = False;
/* Figure out if we're interested in the symbol. Firstly, is it of
the right flavour? */
plausible
= (ELFXX_ST_BIND(sym->st_info) == STB_GLOBAL
|| ELFXX_ST_BIND(sym->st_info) == STB_LOCAL
|| ELFXX_ST_BIND(sym->st_info) == STB_WEAK
)
&&
(ELFXX_ST_TYPE(sym->st_info) == STT_FUNC
|| ELFXX_ST_TYPE(sym->st_info) == STT_OBJECT
#ifdef STT_GNU_IFUNC
|| ELFXX_ST_TYPE(sym->st_info) == STT_GNU_IFUNC
#endif
);
/* Work out the svma and bias for each section as it will appear in
addresses in the symbol table. */
if (symtab_in_debug) {
text_svma = di->text_debug_svma;
text_bias = di->text_debug_bias;
data_svma = di->data_debug_svma;
data_bias = di->data_debug_bias;
sdata_svma = di->sdata_debug_svma;
sdata_bias = di->sdata_debug_bias;
rodata_svma = di->rodata_debug_svma;
rodata_bias = di->rodata_debug_bias;
bss_svma = di->bss_debug_svma;
bss_bias = di->bss_debug_bias;
sbss_svma = di->sbss_debug_svma;
sbss_bias = di->sbss_debug_bias;
} else {
text_svma = di->text_svma;
text_bias = di->text_bias;
data_svma = di->data_svma;
data_bias = di->data_bias;
sdata_svma = di->sdata_svma;
sdata_bias = di->sdata_bias;
rodata_svma = di->rodata_svma;
rodata_bias = di->rodata_bias;
bss_svma = di->bss_svma;
bss_bias = di->bss_bias;
sbss_svma = di->sbss_svma;
sbss_bias = di->sbss_bias;
}
/* Now bias sym_avma_out accordingly by figuring out exactly which
section the symbol is from and bias accordingly. Screws up if
the previously deduced section svma address ranges are wrong. */
if (di->text_present
&& di->text_size > 0
&& sym_svma >= text_svma
&& sym_svma < text_svma + di->text_size) {
*is_text_out = True;
*sym_avma_out += text_bias;
} else
if (di->data_present
&& di->data_size > 0
&& sym_svma >= data_svma
&& sym_svma < data_svma + di->data_size) {
*is_text_out = False;
*sym_avma_out += data_bias;
} else
if (di->sdata_present
&& di->sdata_size > 0
&& sym_svma >= sdata_svma
&& sym_svma < sdata_svma + di->sdata_size) {
*is_text_out = False;
*sym_avma_out += sdata_bias;
} else
if (di->rodata_present
&& di->rodata_size > 0
&& sym_svma >= rodata_svma
&& sym_svma < rodata_svma + di->rodata_size) {
*is_text_out = False;
*sym_avma_out += rodata_bias;
} else
if (di->bss_present
&& di->bss_size > 0
&& sym_svma >= bss_svma
&& sym_svma < bss_svma + di->bss_size) {
*is_text_out = False;
*sym_avma_out += bss_bias;
} else
if (di->sbss_present
&& di->sbss_size > 0
&& sym_svma >= sbss_svma
&& sym_svma < sbss_svma + di->sbss_size) {
*is_text_out = False;
*sym_avma_out += sbss_bias;
} else {
/* Assume it's in .text. Is this a good idea? */
*is_text_out = True;
*sym_avma_out += text_bias;
}
# ifdef STT_GNU_IFUNC
/* Check for indirect functions. */
if (*is_text_out
&& ELFXX_ST_TYPE(sym->st_info) == STT_GNU_IFUNC) {
*is_ifunc = True;
}
# endif
# if defined(VGP_ppc64_linux)
/* Allow STT_NOTYPE in the very special case where we're running on
ppc64-linux and the symbol is one which the .opd-chasing hack
below will chase. */
if (!plausible
&& *is_text_out
&& ELFXX_ST_TYPE(sym->st_info) == STT_NOTYPE
&& sym->st_size > 0
&& di->opd_present
&& di->opd_size > 0
&& *sym_avma_out >= di->opd_avma
&& *sym_avma_out < di->opd_avma + di->opd_size)
plausible = True;
# endif
if (!plausible)
return False;
/* Ignore if nameless, or zero-sized. */
if (sym->st_name == (ElfXX_Word)0
|| /* VG_(strlen)(sym_name) == 0 */
/* equivalent but cheaper ... */
sym_name[0] == 0
|| sym->st_size == 0) {
TRACE_SYMTAB(" ignore -- size=0: %s\n", sym_name);
return False;
}
/* This seems to significantly reduce the number of junk
symbols, and particularly reduces the number of
overlapping address ranges. Don't ask me why ... */
if ((Int)sym->st_value == 0) {
TRACE_SYMTAB( " ignore -- valu=0: %s\n", sym_name);
return False;
}
/* If it's apparently in a GOT or PLT, it's really a reference to a
symbol defined elsewhere, so ignore it. */
if (di->got_present
&& di->got_size > 0
&& *sym_avma_out >= di->got_avma
&& *sym_avma_out < di->got_avma + di->got_size) {
TRACE_SYMTAB(" ignore -- in GOT: %s\n", sym_name);
return False;
}
if (di->plt_present
&& di->plt_size > 0
&& *sym_avma_out >= di->plt_avma
&& *sym_avma_out < di->plt_avma + di->plt_size) {
TRACE_SYMTAB(" ignore -- in PLT: %s\n", sym_name);
return False;
}
/* ppc64-linux nasty hack: if the symbol is in an .opd section,
then really what we have is the address of a function
descriptor. So use the first word of that as the function's
text.
See thread starting at
http://gcc.gnu.org/ml/gcc-patches/2004-08/msg00557.html
*/
# if defined(VGP_ppc64_linux)
is_in_opd = False;
# endif
if (di->opd_present
&& di->opd_size > 0
&& *sym_avma_out >= di->opd_avma
&& *sym_avma_out < di->opd_avma + di->opd_size) {
# if !defined(VGP_ppc64_linux)
TRACE_SYMTAB(" ignore -- in OPD: %s\n", sym_name);
return False;
# else
Int offset_in_opd;
ULong* fn_descr;
Bool details = 1||False;
if (details)
TRACE_SYMTAB("opdXXX: opd_bias %p, sym_svma_out %p\n",
(void*)(opd_bias), (void*)*sym_avma_out);
if (!VG_IS_8_ALIGNED(*sym_avma_out)) {
TRACE_SYMTAB(" ignore -- not 8-aligned: %s\n", sym_name);
return False;
}
/* *sym_avma_out is a vma pointing into the .opd section. We
know the vma of the opd section start, so we can figure out
how far into the opd section this is. */
offset_in_opd = (Addr)(*sym_avma_out) - (Addr)(di->opd_avma);
if (offset_in_opd < 0 || offset_in_opd >= di->opd_size) {
TRACE_SYMTAB(" ignore -- invalid OPD offset: %s\n", sym_name);
return False;
}
/* Now we want to know what's at that offset in the .opd
section. We can't look in the running image since it won't
necessarily have been mapped. But we can consult the oimage.
opd_img is the start address of the .opd in the oimage.
Hence: */
fn_descr = (ULong*)(opd_img + offset_in_opd);
if (details)
TRACE_SYMTAB("opdXXY: offset %d, fn_descr %p\n",
offset_in_opd, fn_descr);
if (details)
TRACE_SYMTAB("opdXXZ: *fn_descr %p\n", (void*)(fn_descr[0]));
/* opd_bias is the what we have to add to SVMAs found in .opd to
get plausible .text AVMAs for the entry point, and .data
AVMAs (presumably) for the TOC locations. We use the caller
supplied value (which is di->text_bias) for both of these.
Not sure why that is correct - it seems to work, and sounds
OK for fn_descr[0], but surely we need to use the data bias
and not the text bias for fn_descr[1] ? Oh Well.
*/
*sym_avma_out = fn_descr[0] + opd_bias;
*sym_tocptr_out = fn_descr[1] + opd_bias;
*from_opd_out = True;
is_in_opd = True;
/* Do a final sanity check: if the symbol falls outside the
DebugInfo's mapped range, ignore it. Since *sym_avma_out has
been updated, that can be achieved simply by falling through
to the test below. */
# endif /* ppc64-linux nasty hack */
}
/* Here's yet another ppc64-linux hack. Get rid of leading dot if
the symbol is outside .opd. */
# if defined(VGP_ppc64_linux)
if (di->opd_size > 0
&& !is_in_opd
&& sym_name[0] == '.') {
vg_assert(!(*from_opd_out));
*sym_name_out = &sym_name[1];
}
# endif
/* If no part of the symbol falls within the mapped range,
ignore it. */
in_text
= di->text_present
&& di->text_size > 0
&& !(*sym_avma_out + *sym_size_out <= di->text_avma
|| *sym_avma_out >= di->text_avma + di->text_size);
in_data
= di->data_present
&& di->data_size > 0
&& !(*sym_avma_out + *sym_size_out <= di->data_avma
|| *sym_avma_out >= di->data_avma + di->data_size);
in_sdata
= di->sdata_present
&& di->sdata_size > 0
&& !(*sym_avma_out + *sym_size_out <= di->sdata_avma
|| *sym_avma_out >= di->sdata_avma + di->sdata_size);
in_rodata
= di->rodata_present
&& di->rodata_size > 0
&& !(*sym_avma_out + *sym_size_out <= di->rodata_avma
|| *sym_avma_out >= di->rodata_avma + di->rodata_size);
in_bss
= di->bss_present
&& di->bss_size > 0
&& !(*sym_avma_out + *sym_size_out <= di->bss_avma
|| *sym_avma_out >= di->bss_avma + di->bss_size);
in_sbss
= di->sbss_present
&& di->sbss_size > 0
&& !(*sym_avma_out + *sym_size_out <= di->sbss_avma
|| *sym_avma_out >= di->sbss_avma + di->sbss_size);
if (*is_text_out) {
/* This used to reject any symbol falling outside the text
segment ("if (!in_text) ..."). Now it is relaxed slightly,
to reject only symbols which fall outside the area mapped
r-x. This is in accordance with r7427. See
"Comment_Regarding_Text_Range_Checks" in storage.c for
background. */
Bool in_rx;
vg_assert(di->have_rx_map);
in_rx = (!(*sym_avma_out + *sym_size_out <= di->rx_map_avma
|| *sym_avma_out >= di->rx_map_avma + di->rx_map_size));
if (in_text)
vg_assert(in_rx);
if (!in_rx) {
TRACE_SYMTAB(
"ignore -- %#lx .. %#lx outside .text svma range %#lx .. %#lx\n",
*sym_avma_out, *sym_avma_out + *sym_size_out,
di->text_avma,
di->text_avma + di->text_size);
return False;
}
} else {
if (!(in_data || in_sdata || in_rodata || in_bss || in_sbss)) {
TRACE_SYMTAB(
"ignore -- %#lx .. %#lx outside .data / .sdata / .rodata / .bss / .sbss svma ranges\n",
*sym_avma_out, *sym_avma_out + *sym_size_out);
return False;
}
}
# if defined(VGP_ppc64_linux)
/* It's crucial that we never add symbol addresses in the .opd
section. This would completely mess up function redirection and
intercepting. This assert ensures that anysymbols that make it
into the symbol table on ppc64-linux don't point into .opd. */
if (di->opd_present && di->opd_size > 0) {
vg_assert(*sym_avma_out + *sym_size_out <= di->opd_avma
|| *sym_avma_out >= di->opd_avma + di->opd_size);
}
# endif
/* Acquire! */
return True;
}
/* Read an ELF symbol table (normal or dynamic). This one is for the
"normal" case ({x86,amd64,ppc32}-linux). */
static
__attribute__((unused)) /* not referred to on all targets */
void read_elf_symtab__normal(
struct _DebugInfo* di, UChar* tab_name,
ElfXX_Sym* symtab_img, SizeT symtab_szB,
UChar* strtab_img, SizeT strtab_szB,
Bool symtab_in_debug,
UChar* opd_img /* ppc64-linux only */
)
{
Word i;
Addr sym_svma, sym_avma_really;
Char *sym_name, *sym_name_really;
Int sym_size;
Addr sym_tocptr;
Bool from_opd, is_text, is_ifunc;
DiSym disym;
ElfXX_Sym *sym;
if (strtab_img == NULL || symtab_img == NULL) {
Char buf[80];
vg_assert(VG_(strlen)(tab_name) < 40);
VG_(sprintf)(buf, " object doesn't have a %s", tab_name);
ML_(symerr)(di, False, buf);
return;
}
TRACE_SYMTAB("\n--- Reading (ELF, standard) %s (%ld entries) ---\n",
tab_name, symtab_szB/sizeof(ElfXX_Sym) );
/* Perhaps should start at i = 1; ELF docs suggest that entry
0 always denotes 'unknown symbol'. */
for (i = 1; i < (Word)(symtab_szB/sizeof(ElfXX_Sym)); i++) {
sym = & symtab_img[i];
sym_name = (UChar*)(strtab_img + sym->st_name);
sym_svma = sym->st_value;
if (di->trace_symtab)
show_raw_elf_symbol(i, sym, sym_name, sym_svma, False);
if (get_elf_symbol_info(di, sym, sym_name, sym_svma,
symtab_in_debug,
opd_img, di->text_bias,
&sym_name_really,
&sym_avma_really,
&sym_size,
&sym_tocptr,
&from_opd, &is_text, &is_ifunc)) {
disym.addr = sym_avma_really;
disym.tocptr = sym_tocptr;
disym.pri_name = ML_(addStr) ( di, sym_name_really, -1 );
disym.sec_names = NULL;
disym.size = sym_size;
disym.isText = is_text;
disym.isIFunc = is_ifunc;
vg_assert(disym.pri_name);
vg_assert(disym.tocptr == 0); /* has no role except on ppc64-linux */
ML_(addSym) ( di, &disym );
if (di->trace_symtab) {
VG_(printf)(" rec(%c) [%4ld]: "
" val %#010lx, sz %4d %s\n",
is_text ? 't' : 'd',
i,
disym.addr,
(Int)disym.size,
(HChar*)disym.pri_name
);
}
}
}
}
/* Read an ELF symbol table (normal or dynamic). This one is for
ppc64-linux, which requires special treatment. */
typedef
struct {
Addr addr;
UChar* name;
}
TempSymKey;
typedef
struct {
TempSymKey key;
Addr tocptr;
Int size;
Bool from_opd;
Bool is_text;
Bool is_ifunc;
}
TempSym;
static Word cmp_TempSymKey ( TempSymKey* key1, TempSym* elem2 ) {
if (key1->addr < elem2->key.addr) return -1;
if (key1->addr > elem2->key.addr) return 1;
return (Word)VG_(strcmp)(key1->name, elem2->key.name);
}
static
__attribute__((unused)) /* not referred to on all targets */
void read_elf_symtab__ppc64_linux(
struct _DebugInfo* di, UChar* tab_name,
ElfXX_Sym* symtab_img, SizeT symtab_szB,
UChar* strtab_img, SizeT strtab_szB,
Bool symtab_in_debug,
UChar* opd_img /* ppc64-linux only */
)
{
Word i;
Int old_size;
Addr sym_svma, sym_avma_really;
Char *sym_name, *sym_name_really;
Int sym_size;
Addr sym_tocptr;
Bool from_opd, modify_size, modify_tocptr, is_text, is_ifunc;
DiSym disym;
ElfXX_Sym *sym;
OSet *oset;
TempSymKey key;
TempSym *elem;
TempSym *prev;
if (strtab_img == NULL || symtab_img == NULL) {
Char buf[80];
vg_assert(VG_(strlen)(tab_name) < 40);
VG_(sprintf)(buf, " object doesn't have a %s", tab_name);
ML_(symerr)(di, False, buf);
return;
}
TRACE_SYMTAB("\n--- Reading (ELF, ppc64-linux) %s (%ld entries) ---\n",
tab_name, symtab_szB/sizeof(ElfXX_Sym) );
oset = VG_(OSetGen_Create)( offsetof(TempSym,key),
(OSetCmp_t)cmp_TempSymKey,
ML_(dinfo_zalloc), "di.respl.1",
ML_(dinfo_free) );
vg_assert(oset);
/* Perhaps should start at i = 1; ELF docs suggest that entry
0 always denotes 'unknown symbol'. */
for (i = 1; i < (Word)(symtab_szB/sizeof(ElfXX_Sym)); i++) {
sym = & symtab_img[i];
sym_name = (Char*)(strtab_img + sym->st_name);
sym_svma = sym->st_value;
if (di->trace_symtab)
show_raw_elf_symbol(i, sym, sym_name, sym_svma, True);
if (get_elf_symbol_info(di, sym, sym_name, sym_svma,
symtab_in_debug,
opd_img, di->text_bias,
&sym_name_really,
&sym_avma_really,
&sym_size,
&sym_tocptr,
&from_opd, &is_text, &is_ifunc)) {
/* Check if we've seen this (name,addr) key before. */
key.addr = sym_avma_really;
key.name = sym_name_really;
prev = VG_(OSetGen_Lookup)( oset, &key );
if (prev) {
/* Seen it before. Fold in whatever new info we can. */
modify_size = False;
modify_tocptr = False;
old_size = 0;
if (prev->from_opd && !from_opd
&& (prev->size == 24 || prev->size == 16)
&& sym_size != prev->size) {
/* Existing one is an opd-redirect, with a bogus size,
so the only useful new fact we have is the real size
of the symbol. */
modify_size = True;
old_size = prev->size;
prev->size = sym_size;
}
else
if (!prev->from_opd && from_opd
&& (sym_size == 24 || sym_size == 16)) {
/* Existing one is non-opd, new one is opd. What we
can acquire from the new one is the TOC ptr to be
used. Since the existing sym is non-toc, it
shouldn't currently have an known TOC ptr. */
vg_assert(prev->tocptr == 0);
modify_tocptr = True;
prev->tocptr = sym_tocptr;
}
else {
/* ignore. can we do better here? */
}
/* Only one or the other is possible (I think) */
vg_assert(!(modify_size && modify_tocptr));
if (modify_size && di->trace_symtab) {
VG_(printf)(" modify (old sz %4d) "
" val %#010lx, toc %#010lx, sz %4d %s\n",
old_size,
prev->key.addr,
prev->tocptr,
(Int) prev->size,
(HChar*)prev->key.name
);
}
if (modify_tocptr && di->trace_symtab) {
VG_(printf)(" modify (upd tocptr) "
" val %#010lx, toc %#010lx, sz %4d %s\n",
prev->key.addr,
prev->tocptr,
(Int) prev->size,
(HChar*)prev->key.name
);
}
} else {
/* A new (name,addr) key. Add and continue. */
elem = VG_(OSetGen_AllocNode)(oset, sizeof(TempSym));
vg_assert(elem);
elem->key = key;
elem->tocptr = sym_tocptr;
elem->size = sym_size;
elem->from_opd = from_opd;
elem->is_text = is_text;
elem->is_ifunc = is_ifunc;
VG_(OSetGen_Insert)(oset, elem);
if (di->trace_symtab) {
VG_(printf)(" to-oset [%4ld]: "
" val %#010lx, toc %#010lx, sz %4d %s\n",
i,
elem->key.addr,
elem->tocptr,
(Int) elem->size,
(HChar*)elem->key.name
);
}
}
}
}
/* All the syms that matter are in the oset. Now pull them out,
build a "standard" symbol table, and nuke the oset. */
i = 0;
VG_(OSetGen_ResetIter)( oset );
while ( (elem = VG_(OSetGen_Next)(oset)) ) {
disym.addr = elem->key.addr;
disym.tocptr = elem->tocptr;
disym.pri_name = ML_(addStr) ( di, elem->key.name, -1 );
disym.sec_names = NULL;
disym.size = elem->size;
disym.isText = elem->is_text;
disym.isIFunc = elem->is_ifunc;
vg_assert(disym.pri_name != NULL);
ML_(addSym) ( di, &disym );
if (di->trace_symtab) {
VG_(printf)(" rec(%c) [%4ld]: "
" val %#010lx, toc %#010lx, sz %4d %s\n",
disym.isText ? 't' : 'd',
i,
disym.addr,
disym.tocptr,
(Int) disym.size,
(HChar*)disym.pri_name
);
}
i++;
}
VG_(OSetGen_Destroy)( oset );
}
/*
* Look for a build-id in an ELF image. The build-id specification
* can be found here:
*
* http://fedoraproject.org/wiki/RolandMcGrath/BuildID
*/
static
Char *find_buildid(Addr image, UWord n_image)
{
Char* buildid = NULL;
__attribute__((unused)) /* on Android, at least */
ElfXX_Ehdr* ehdr = (ElfXX_Ehdr*)image;
#ifdef NT_GNU_BUILD_ID
if (n_image >= sizeof(ElfXX_Ehdr) &&
ML_(is_elf_object_file)(ehdr, n_image)) {
Word i;
for (i = 0; i < ehdr->e_phnum; i++) {
ElfXX_Phdr* phdr = (ElfXX_Phdr*)(image + ehdr->e_phoff + i * ehdr->e_phentsize);
if (phdr->p_type == PT_NOTE) {
ElfXX_Off offset = phdr->p_offset;
while (offset < phdr->p_offset + phdr->p_filesz) {
ElfXX_Nhdr* note = (ElfXX_Nhdr*)(image + offset);
Char* name = (Char *)note + sizeof(ElfXX_Nhdr);
UChar *desc = (UChar *)name + ((note->n_namesz + 3) & ~3);
Word j;
if (VG_(strcmp)(name, ELF_NOTE_GNU) == 0 &&
note->n_type == NT_GNU_BUILD_ID) {
buildid = ML_(dinfo_zalloc)("di.fbi.1", note->n_descsz * 2 + 1);
for (j = 0; j < note->n_descsz; j++) {
VG_(sprintf)(buildid + VG_(strlen)(buildid), "%02x", desc[j]);
}
}
offset = offset + sizeof(ElfXX_Nhdr)
+ ((note->n_namesz + 3) & ~3)
+ ((note->n_descsz + 3) & ~3);
}
}
}
}
#endif
return buildid;
}
/*
* This routine for calculating the CRC for a separate debug file
* is GPLed code borrowed from GNU binutils.
*/
static UInt
calc_gnu_debuglink_crc32(UInt crc, const UChar *buf, Int len)
{
static const UInt crc32_table[256] =
{
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
0x2d02ef8d
};
const UChar *end;
crc = ~crc & 0xffffffff;
for (end = buf + len; buf < end; ++ buf)
crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
return ~crc & 0xffffffff;;
}
/*
* Try and open a separate debug file, ignoring any where the CRC does
* not match the value from the main object file.
*/
static
Addr open_debug_file( Char* name, Char* buildid, UInt crc, /*OUT*/UWord* size )
{
SysRes fd, sres;
struct vg_stat stat_buf;
UInt calccrc;
fd = VG_(open)(name, VKI_O_RDONLY, 0);
if (sr_isError(fd))
return 0;
if (VG_(fstat)(sr_Res(fd), &stat_buf) != 0) {
VG_(close)(sr_Res(fd));
return 0;
}
if (VG_(clo_verbosity) > 1)
VG_(message)(Vg_DebugMsg, " Considering %s ..\n", name);
*size = stat_buf.size;
sres = VG_(am_mmap_file_float_valgrind)
( *size, VKI_PROT_READ, sr_Res(fd), 0 );
VG_(close)(sr_Res(fd));
if (sr_isError(sres))
return 0;
if (buildid) {
Char* debug_buildid = find_buildid(sr_Res(sres), *size);
if (debug_buildid == NULL || VG_(strcmp)(buildid, debug_buildid) != 0) {
SysRes res = VG_(am_munmap_valgrind)(sr_Res(sres), *size);
vg_assert(!sr_isError(res));
if (VG_(clo_verbosity) > 1)
VG_(message)(Vg_DebugMsg,
" .. build-id mismatch (found %s wanted %s)\n", debug_buildid, buildid);
ML_(dinfo_free)(debug_buildid);
return 0;
}
ML_(dinfo_free)(debug_buildid);
if (VG_(clo_verbosity) > 1)
VG_(message)(Vg_DebugMsg, " .. build-id is valid\n");
} else {
calccrc = calc_gnu_debuglink_crc32(0, (UChar*)sr_Res(sres), *size);
if (calccrc != crc) {
SysRes res = VG_(am_munmap_valgrind)(sr_Res(sres), *size);
vg_assert(!sr_isError(res));
if (VG_(clo_verbosity) > 1)
VG_(message)(Vg_DebugMsg,
" .. CRC mismatch (computed %08x wanted %08x)\n", calccrc, crc);
return 0;
}
if (VG_(clo_verbosity) > 1)
VG_(message)(Vg_DebugMsg, " .. CRC is valid\n");
}
return sr_Res(sres);
}
/*
* Try to find a separate debug file for a given object file.
*/
static
Addr find_debug_file( struct _DebugInfo* di,
Char* objpath, Char* buildid,
Char* debugname, UInt crc,
/*OUT*/UWord* size )
{
Char *debugpath = NULL;
Addr addr = 0;
if (buildid != NULL) {
debugpath = ML_(dinfo_zalloc)(
"di.fdf.1",
VG_(strlen)(buildid) + 33);
VG_(sprintf)(debugpath, "/usr/lib/debug/.build-id/%c%c/%s.debug",
buildid[0], buildid[1], buildid + 2);
if ((addr = open_debug_file(debugpath, buildid, 0, size)) == 0) {
ML_(dinfo_free)(debugpath);
debugpath = NULL;
}
}
if (addr == 0 && debugname != NULL) {
Char *objdir = ML_(dinfo_strdup)("di.fdf.2", objpath);
Char *objdirptr;
if ((objdirptr = VG_(strrchr)(objdir, '/')) != NULL)
*objdirptr = '\0';
debugpath = ML_(dinfo_zalloc)(
"di.fdf.3",
VG_(strlen)(objdir) + VG_(strlen)(debugname) + 32);
VG_(sprintf)(debugpath, "%s/%s", objdir, debugname);
if ((addr = open_debug_file(debugpath, NULL, crc, size)) == 0) {
VG_(sprintf)(debugpath, "%s/.debug/%s", objdir, debugname);
if ((addr = open_debug_file(debugpath, NULL, crc, size)) == 0) {
VG_(sprintf)(debugpath, "/usr/lib/debug%s/%s", objdir, debugname);
addr = open_debug_file(debugpath, NULL, crc, size);
}
}
ML_(dinfo_free)(objdir);
}
if (addr) {
TRACE_SYMTAB("\n");
TRACE_SYMTAB("------ Found a debuginfo file: %s\n", debugpath);
}
ML_(dinfo_free)(debugpath);
return addr;
}
static Bool contained_within ( Addr outer, UWord n_outer,
Addr inner, UWord n_inner )
{
if (n_outer == 0 || n_inner == 0)
return False;
/* Simplistic .. assumes no wraparound (reasonably enough) */
if (inner >= outer && inner+n_inner <= outer+n_outer)
return True;
return False;
}
static void* INDEX_BIS ( void* base, Word idx, Word scale ) {
return (void*)( ((UChar*)base) + idx * scale );
}
/* Find the file offset corresponding to SVMA by using the program
headers. This is taken from binutils-2.17/binutils/readelf.c
offset_from_vma(). */
static
Word file_offset_from_svma ( /*OUT*/Bool* ok,
Addr svma,
ElfXX_Phdr* phdr_img,
Word phdr_nent,
Word phdr_ent_szB )
{
Word i;
ElfXX_Phdr* seg;
for (i = 0; i < phdr_nent; i++) {
seg = INDEX_BIS( phdr_img, i, phdr_ent_szB );
if (seg->p_type != PT_LOAD)
continue;
if (svma >= (seg->p_vaddr & -seg->p_align)
&& svma + 1 <= seg->p_vaddr + seg->p_filesz) {
*ok = True;
return svma - seg->p_vaddr + seg->p_offset;
}
}
*ok = False;
return 0;
}
/* The central function for reading ELF debug info. For the
object/exe specified by the DebugInfo, find ELF sections, then read
the symbols, line number info, file name info, CFA (stack-unwind
info) and anything else we want, into the tables within the
supplied DebugInfo.
*/
/* Temporarily holds information copied out of PT_LOAD entries
in ML_(read_elf_debug_info. */
typedef
struct { Addr svma_base; Addr svma_limit; PtrdiffT bias; }
RangeAndBias;
Bool ML_(read_elf_debug_info) ( struct _DebugInfo* di )
{
Bool res, ok;
SysRes fd, sres;
Word i;
Bool dynbss_present = False;
Bool sdynbss_present = False;
/* Image addresses for the ELF file we're working with. */
Addr oimage = 0;
UWord n_oimage = 0;
/* Ditto for any ELF debuginfo file that we might happen to load. */
Addr dimage = 0;
UWord n_dimage = 0;
/* ELF header for the main file. Should == oimage since is at
start of file. */
ElfXX_Ehdr* ehdr_img = NULL;
/* Program header table image addr, # entries, entry size */
ElfXX_Phdr* phdr_img = NULL;
UWord phdr_nent = 0;
UWord phdr_ent_szB = 0;
/* Section header image addr, # entries, entry size. Also the
associated string table. */
ElfXX_Shdr* shdr_img = NULL;
UWord shdr_nent = 0;
UWord shdr_ent_szB = 0;
UChar* shdr_strtab_img = NULL;
/* SVMAs covered by rx and rw segments and corresponding biases.
We keep separate lists of rx and rw areas. Each can have up to
N_RX_RW_AREAS entries. Normally each object would provide just
one rx and one rw area, but Mike Hommey's elfhack creates
objects with two rx PT_LOAD entries, hence the generality. */
const Int N_RX_RW_AREAS = 2;
RangeAndBias rx[N_RX_RW_AREAS];
RangeAndBias rw[N_RX_RW_AREAS];
Word n_rx = 0; /* 0 .. N_RX_RW_AREAS */
Word n_rw = 0; /* 0 .. N_RX_RW_AREAS */
/* Pointless paranoia: */
VG_(memset)( rx, 0, sizeof(rx) );
VG_(memset)( rw, 0, sizeof(rw) );
/* Build ID */
Char* buildid = NULL;
vg_assert(di);
vg_assert(di->have_rx_map == True);
vg_assert(di->have_rw_map == True);
vg_assert(di->rx_map_size > 0);
vg_assert(di->rw_map_size > 0);
vg_assert(di->have_dinfo == False);
vg_assert(di->filename);
vg_assert(!di->memname);
vg_assert(!di->symtab);
vg_assert(!di->loctab);
vg_assert(!di->cfsi);
vg_assert(!di->cfsi_exprs);
vg_assert(!di->strchunks);
vg_assert(!di->soname);
/* If these don't hold true, it means that m_syswrap/m_aspacemgr
managed to do a mapping where the start isn't page aligned.
Which sounds pretty bogus to me. */
vg_assert(VG_IS_PAGE_ALIGNED(di->rx_map_avma));
vg_assert(VG_IS_PAGE_ALIGNED(di->rw_map_avma));
/* ----------------------------------------------------------
At this point, there is very little information in the
DebugInfo. We only know that something that looks like an ELF
file has been mapped rx-ishly as recorded with the di->*rx_map*
fields and has also been mapped rw-ishly as recorded with the
di->*rw_map* fields. First we examine the file's ELF Program
Header, and, by comparing that against the di->*r{w,x}_map*
info, try to figure out the AVMAs for the sections we care
about, that should have been mapped: text, data, sdata, bss,
got, plt, and toc.
---------------------------------------------------------- */
res = False;
oimage = (Addr)NULL;
if (VG_(clo_verbosity) > 1 || VG_(clo_trace_redir))
VG_(message)(Vg_DebugMsg, "Reading syms from %s (%#lx)\n",
di->filename, di->rx_map_avma );
/* mmap the object image aboard, so that we can read symbols and
line number info out of it. It will be munmapped immediately
thereafter; it is only aboard transiently. */
fd = VG_(open)(di->filename, VKI_O_RDONLY, 0);
if (sr_isError(fd)) {
ML_(symerr)(di, True, "Can't open .so/.exe to read symbols?!");
return False;
}
{ Long n_oimageLL = VG_(fsize)(sr_Res(fd));
if (n_oimageLL <= 0) {
ML_(symerr)(di, True, "Can't stat .so/.exe (to determine its size)?!");
VG_(close)(sr_Res(fd));
return False;
}
n_oimage = (UWord)(ULong)n_oimageLL;
}
sres = VG_(am_mmap_file_float_valgrind)
( n_oimage, VKI_PROT_READ, sr_Res(fd), 0 );
VG_(close)(sr_Res(fd));
if (sr_isError(sres)) {
VG_(message)(Vg_UserMsg, "warning: mmap failed on %s\n", di->filename );
VG_(message)(Vg_UserMsg, " no symbols or debug info loaded\n" );
return False;
}
oimage = sr_Res(sres);
/* Check against wraparound. am_mmap_file_float_valgrind should
not produce a wrapped-around mapping. */
vg_assert(n_oimage > 0);
vg_assert(oimage + n_oimage > oimage);
if (0) {
VG_(printf)("read_elf_debug_info: OIMAGE = %p - %p\n",
(void*)oimage, (void*)(oimage + (UWord)n_oimage));
}
/* Ok, the object image is safely in oimage[0 .. n_oimage-1]. Now
verify that it is a valid ELF .so or executable image. */
res = False;
ok = (n_oimage >= sizeof(ElfXX_Ehdr));
ehdr_img = (ElfXX_Ehdr*)oimage;
if (ok)
ok &= ML_(is_elf_object_file)(ehdr_img, n_oimage);
if (!ok) {
ML_(symerr)(di, True, "Invalid ELF Header");
goto out;
}
/* Find where the program and section header tables are, and give
up if either is missing or outside the image (bogus). */
phdr_img = (ElfXX_Phdr*)( ((UChar*)ehdr_img) + ehdr_img->e_phoff );
phdr_nent = ehdr_img->e_phnum;
phdr_ent_szB = ehdr_img->e_phentsize;
shdr_img = (ElfXX_Shdr*)( ((UChar*)ehdr_img) + ehdr_img->e_shoff );
shdr_nent = ehdr_img->e_shnum;
shdr_ent_szB = ehdr_img->e_shentsize;
TRACE_SYMTAB("------ Basic facts about the object ------\n");
TRACE_SYMTAB("object: img %p n_oimage %ld\n",
(void*)oimage, n_oimage);
TRACE_SYMTAB("phdr: img %p nent %ld ent_szB %ld\n",
phdr_img, phdr_nent, phdr_ent_szB);
TRACE_SYMTAB("shdr: img %p nent %ld ent_szB %ld\n",
shdr_img, shdr_nent, shdr_ent_szB);
TRACE_SYMTAB("rx_map: avma %#lx size %lu foff %lu\n",
di->rx_map_avma, di->rx_map_size, di->rx_map_foff);
TRACE_SYMTAB("rw_map: avma %#lx size %lu foff %lu\n",
di->rw_map_avma, di->rw_map_size, di->rw_map_foff);
if (phdr_nent == 0
|| !contained_within(
oimage, n_oimage,
(Addr)phdr_img, phdr_nent * phdr_ent_szB)) {
ML_(symerr)(di, True, "Missing or invalid ELF Program Header Table");
goto out;
}
if (shdr_nent == 0
|| !contained_within(
oimage, n_oimage,
(Addr)shdr_img, shdr_nent * shdr_ent_szB)) {
ML_(symerr)(di, True, "Missing or invalid ELF Section Header Table");
goto out;
}
/* Also find the section header's string table, and validate. */
/* checked previously by is_elf_object_file: */
vg_assert( ehdr_img->e_shstrndx != SHN_UNDEF );
shdr_strtab_img
= (UChar*)( ((UChar*)ehdr_img)
+ shdr_img[ehdr_img->e_shstrndx].sh_offset);
if (!contained_within( oimage, n_oimage,
(Addr)shdr_strtab_img,
1/*bogus, but we don't know the real size*/ )) {
ML_(symerr)(di, True, "Invalid ELF Section Header String Table");
goto out;
}
TRACE_SYMTAB("shdr: string table at %p\n", shdr_strtab_img );
/* Look through the program header table, and:
- copy information from suitable PT_LOAD entries into rx[] or
rw[]
- find (or fake up) the .soname for this object.
*/
TRACE_SYMTAB("\n");
TRACE_SYMTAB("------ Examining the program headers ------\n");
vg_assert(di->soname == NULL);
{
ElfXX_Addr prev_svma = 0;
for (i = 0; i < phdr_nent; i++) {
ElfXX_Phdr* phdr = INDEX_BIS( phdr_img, i, phdr_ent_szB );
/* Make sure the PT_LOADable entries are in order and
non-overlapping. This in turn means the address ranges
slurped into rx[] and rw[] are in order and
non-overlapping. */
vg_assert(n_rx >= 0 && n_rx <= N_RX_RW_AREAS);
vg_assert(n_rw >= 0 && n_rw <= N_RX_RW_AREAS);
if (phdr->p_type == PT_LOAD) {
TRACE_SYMTAB("PT_LOAD[%ld]: p_vaddr %#lx (prev %#lx)\n",
i, (UWord)phdr->p_vaddr, (UWord)prev_svma);
TRACE_SYMTAB("PT_LOAD[%ld]: p_offset %#lx, p_filesz %lu,"
" perms %c%c%c\n",
i, (UWord)phdr->p_offset, (UWord)phdr->p_filesz,
phdr->p_flags & PF_R ? 'r' : '-',
phdr->p_flags & PF_W ? 'w' : '-',
phdr->p_flags & PF_X ? 'x' : '-');
if (phdr->p_vaddr < prev_svma) {
ML_(symerr)(di, True,
"ELF Program Headers are not in ascending order");
goto out;
}
prev_svma = phdr->p_vaddr;
if (phdr->p_offset >= di->rx_map_foff
&& phdr->p_offset < di->rx_map_foff + di->rx_map_size
&& phdr->p_offset + phdr->p_filesz <= di->rx_map_foff + di->rx_map_size
&& (phdr->p_flags & (PF_R | PF_W | PF_X)) == (PF_R | PF_X)) {
if (n_rx == N_RX_RW_AREAS) {
ML_(symerr)(di, True,
"N_RX_RW_AREAS is too low; increase and recompile.");
goto out;
}
rx[n_rx].svma_base = phdr->p_vaddr;
rx[n_rx].svma_limit = phdr->p_vaddr + phdr->p_memsz;
rx[n_rx].bias = di->rx_map_avma - di->rx_map_foff
+ phdr->p_offset - phdr->p_vaddr;
n_rx++;
TRACE_SYMTAB("PT_LOAD[%ld]: acquired as rx\n", i);
}
else
if (phdr->p_offset >= di->rw_map_foff
&& phdr->p_offset < di->rw_map_foff + di->rw_map_size
&& phdr->p_offset + phdr->p_filesz <= di->rw_map_foff + di->rw_map_size
&& (phdr->p_flags & (PF_R | PF_W | PF_X)) == (PF_R | PF_W)) {
if (n_rw == N_RX_RW_AREAS) {
ML_(symerr)(di, True,
"N_RX_RW_AREAS is too low; increase and recompile.");
goto out;
}
rw[n_rw].svma_base = phdr->p_vaddr;
rw[n_rw].svma_limit = phdr->p_vaddr + phdr->p_memsz;
rw[n_rw].bias = di->rw_map_avma - di->rw_map_foff
+ phdr->p_offset - phdr->p_vaddr;
n_rw++;
TRACE_SYMTAB("PT_LOAD[%ld]: acquired as rw\n", i);
}
}
/* Try to get the soname. If there isn't one, use "NONE".
The seginfo needs to have some kind of soname in order to
facilitate writing redirect functions, since all redirect
specifications require a soname (pattern). */
if (phdr->p_type == PT_DYNAMIC && di->soname == NULL) {
ElfXX_Dyn* dyn_img = (ElfXX_Dyn*)( ((UChar*)ehdr_img)
+ phdr->p_offset);
Word stroff = -1;
UChar* strtab = NULL;
Word j;
for (j = 0; dyn_img[j].d_tag != DT_NULL; j++) {
switch (dyn_img[j].d_tag) {
case DT_SONAME: {
stroff = dyn_img[j].d_un.d_val;
break;
}
case DT_STRTAB: {
Bool ok2 = False;
Word offset = file_offset_from_svma(
&ok2,
dyn_img[j].d_un.d_ptr,
phdr_img,
phdr_nent, phdr_ent_szB
);
if (ok2 && strtab == NULL) {
vg_assert(offset >= 0 && offset <= n_oimage);
strtab = ((UChar*)ehdr_img) + offset;
}
break;
}
default:
break;
}
}
if (stroff != -1 && strtab != NULL) {
TRACE_SYMTAB("Found soname = %s\n", strtab+stroff);
di->soname = ML_(dinfo_strdup)("di.redi.1", strtab+stroff);
}
}
} /* for (i = 0; i < phdr_nent; i++) ... */
} /* look for the soname */
/* If, after looking at all the program headers, we still didn't
find a soname, add a fake one. */
if (di->soname == NULL) {
TRACE_SYMTAB("No soname found; using (fake) \"NONE\"\n");
di->soname = "NONE";
}
vg_assert(n_rx >= 0 && n_rx <= N_RX_RW_AREAS);
vg_assert(n_rw >= 0 && n_rw <= N_RX_RW_AREAS);
for (i = 0; i < n_rx; i++) {
vg_assert(rx[i].svma_limit != 0);
}
for (i = 0; i < n_rw; i++) {
vg_assert(rw[i].svma_limit != 0);
}
/* Now read the section table. */
TRACE_SYMTAB("\n");
TRACE_SYMTAB("------ Examining the section headers ------\n");
TRACE_SYMTAB("rx: at %#lx are mapped foffsets %ld .. %ld\n",
di->rx_map_avma,
di->rx_map_foff, di->rx_map_foff + di->rx_map_size - 1 );
for (i = 0; i < n_rx; i++) {
TRACE_SYMTAB("rx[%ld]: contains svmas %#lx .. %#lx with bias %#lx\n",
i, rx[i].svma_base, rx[i].svma_limit - 1, rx[i].bias );
}
TRACE_SYMTAB("rw: at %#lx are mapped foffsets %ld .. %ld\n",
di->rw_map_avma,
di->rw_map_foff, di->rw_map_foff + di->rw_map_size - 1 );
for (i = 0; i < n_rw; i++) {
TRACE_SYMTAB("rw[%ld]: contains svmas %#lx .. %#lx with bias %#lx\n",
i, rw[i].svma_base, rw[i].svma_limit - 1, rw[i].bias );
}
/* Iterate over section headers */
for (i = 0; i < shdr_nent; i++) {
ElfXX_Shdr* shdr = INDEX_BIS( shdr_img, i, shdr_ent_szB );
UChar* name = shdr_strtab_img + shdr->sh_name;
Addr svma = shdr->sh_addr;
OffT foff = shdr->sh_offset;
UWord size = shdr->sh_size;
UInt alyn = shdr->sh_addralign;
Bool bits = !(shdr->sh_type == SHT_NOBITS);
/* Look through our collection of info obtained from the PT_LOAD
headers, and make 'inrx' and 'inrw' point to the first entry
in each that intersects 'avma'. If in each case none is found,
leave the relevant pointer at NULL. */
RangeAndBias* inrx = NULL;
RangeAndBias* inrw = NULL;
{ Word j;
for (j = 0; j < n_rx; j++) {
if (svma >= rx[j].svma_base && svma < rx[j].svma_limit) {
inrx = &rx[j];
break;
}
}
for (j = 0; j < n_rw; j++) {
if (svma >= rw[j].svma_base && svma < rw[j].svma_limit) {
inrw = &rw[j];
break;
}
}
}
TRACE_SYMTAB(" [sec %2ld] %s %s al%2u foff %6ld .. %6ld "
" svma %p name \"%s\"\n",
i, inrx ? "rx" : " ", inrw ? "rw" : " ", alyn,
foff, foff+size-1, (void*)svma, name );
/* Check for sane-sized segments. SHT_NOBITS sections have zero
size in the file. */
if ((foff >= n_oimage) || (foff + (bits ? size : 0) > n_oimage)) {
ML_(symerr)(di, True, "ELF Section extends beyond image end");
goto out;
}
/* Check for a sane alignment value. */
if (alyn > 0 && -1 == VG_(log2)(alyn)) {
ML_(symerr)(di, True, "ELF Section contains invalid "
".sh_addralign value");
goto out;
}
# define BAD(_secname) \
do { ML_(symerr)(di, True, \
"Can't make sense of " _secname \
" section mapping"); \
goto out; \
} while (0)
/* Find avma-s for: .text .data .sdata .rodata .bss .sbss .plt .got .opd
and .eh_frame */
/* Accept .text where mapped as rx (code), even if zero-sized */
if (0 == VG_(strcmp)(name, ".text")) {
if (inrx && size >= 0 && !di->text_present) {
di->text_present = True;
di->text_svma = svma;
di->text_avma = svma + inrx->bias;
di->text_size = size;
di->text_bias = inrx->bias;
di->text_debug_svma = svma;
di->text_debug_bias = inrx->bias;
TRACE_SYMTAB("acquiring .text svma = %#lx .. %#lx\n",
di->text_svma,
di->text_svma + di->text_size - 1);
TRACE_SYMTAB("acquiring .text avma = %#lx .. %#lx\n",
di->text_avma,
di->text_avma + di->text_size - 1);
TRACE_SYMTAB("acquiring .text bias = %#lx\n", di->text_bias);
} else {
BAD(".text");
}
}
/* Accept .data where mapped as rw (data), even if zero-sized */
if (0 == VG_(strcmp)(name, ".data")) {
if (inrw && size >= 0 && !di->data_present) {
di->data_present = True;
di->data_svma = svma;
di->data_avma = svma + inrw->bias;
di->data_size = size;
di->data_bias = inrw->bias;
di->data_debug_svma = svma;
di->data_debug_bias = inrw->bias;
TRACE_SYMTAB("acquiring .data svma = %#lx .. %#lx\n",
di->data_svma,
di->data_svma + di->data_size - 1);
TRACE_SYMTAB("acquiring .data avma = %#lx .. %#lx\n",
di->data_avma,
di->data_avma + di->data_size - 1);
TRACE_SYMTAB("acquiring .data bias = %#lx\n", di->data_bias);
} else {
BAD(".data");
}
}
/* Accept .sdata where mapped as rw (data) */
if (0 == VG_(strcmp)(name, ".sdata")) {
if (inrw && size > 0 && !di->sdata_present) {
di->sdata_present = True;
di->sdata_svma = svma;
di->sdata_avma = svma + inrw->bias;
di->sdata_size = size;
di->sdata_bias = inrw->bias;
di->sdata_debug_svma = svma;
di->sdata_debug_bias = inrw->bias;
TRACE_SYMTAB("acquiring .sdata svma = %#lx .. %#lx\n",
di->sdata_svma,
di->sdata_svma + di->sdata_size - 1);
TRACE_SYMTAB("acquiring .sdata avma = %#lx .. %#lx\n",
di->sdata_avma,
di->sdata_avma + di->sdata_size - 1);
TRACE_SYMTAB("acquiring .sdata bias = %#lx\n", di->sdata_bias);
} else {
BAD(".sdata");
}
}
/* Accept .rodata where mapped as rx (data), even if zero-sized */
if (0 == VG_(strcmp)(name, ".rodata")) {
if (inrx && size >= 0 && !di->rodata_present) {
di->rodata_present = True;
di->rodata_svma = svma;
di->rodata_avma = svma + inrx->bias;
di->rodata_size = size;
di->rodata_bias = inrx->bias;
di->rodata_debug_svma = svma;
di->rodata_debug_bias = inrx->bias;
/* NB was 'inrw' prior to r11794 */
TRACE_SYMTAB("acquiring .rodata svma = %#lx .. %#lx\n",
di->rodata_svma,
di->rodata_svma + di->rodata_size - 1);
TRACE_SYMTAB("acquiring .rodata avma = %#lx .. %#lx\n",
di->rodata_avma,
di->rodata_avma + di->rodata_size - 1);
TRACE_SYMTAB("acquiring .rodata bias = %#lx\n", di->rodata_bias);
} else {
BAD(".rodata");
}
}
if (0 == VG_(strcmp)(name, ".dynbss")) {
if (inrw && size > 0 && !di->bss_present) {
dynbss_present = True;
di->bss_present = True;
di->bss_svma = svma;
di->bss_avma = svma + inrw->bias;
di->bss_size = size;
di->bss_bias = inrw->bias;
di->bss_debug_svma = svma;
di->bss_debug_bias = inrw->bias;
TRACE_SYMTAB("acquiring .dynbss svma = %#lx .. %#lx\n",
di->bss_svma,
di->bss_svma + di->bss_size - 1);
TRACE_SYMTAB("acquiring .dynbss avma = %#lx .. %#lx\n",
di->bss_avma,
di->bss_avma + di->bss_size - 1);
TRACE_SYMTAB("acquiring .dynbss bias = %#lx\n", di->bss_bias);
}
}
/* Accept .bss where mapped as rw (data), even if zero-sized */
if (0 == VG_(strcmp)(name, ".bss")) {
if (inrw && size > 0 && dynbss_present) {
vg_assert(di->bss_present);
dynbss_present = False;
vg_assert(di->bss_svma + di->bss_size == svma);
di->bss_size += size;
TRACE_SYMTAB("acquiring .bss svma = %#lx .. %#lx\n",
svma, svma + size - 1);
TRACE_SYMTAB("acquiring .bss avma = %#lx .. %#lx\n",
svma + inrw->bias, svma + inrw->bias + size - 1);
TRACE_SYMTAB("acquiring .bss bias = %#lx\n", di->bss_bias);
} else
if (inrw && size >= 0 && !di->bss_present) {
di->bss_present = True;
di->bss_svma = svma;
di->bss_avma = svma + inrw->bias;
di->bss_size = size;
di->bss_bias = inrw->bias;
di->bss_debug_svma = svma;
di->bss_debug_bias = inrw->bias;
TRACE_SYMTAB("acquiring .bss svma = %#lx .. %#lx\n",
di->bss_svma,
di->bss_svma + di->bss_size - 1);
TRACE_SYMTAB("acquiring .bss avma = %#lx .. %#lx\n",
di->bss_avma,
di->bss_avma + di->bss_size - 1);
TRACE_SYMTAB("acquiring .bss bias = %#lx\n", di->bss_bias);
} else
/* Now one from the wtf?! department ... */
if (inrx && (!inrw) && size >= 0 && !di->bss_present) {
/* File contains a .bss, but it got mapped as rx only.
This is very strange. For now, just pretend we didn't
see it :-) */
di->bss_present = False;
di->bss_svma = 0;
di->bss_avma = 0;
di->bss_size = 0;
di->bss_bias = 0;
di->bss_debug_svma = 0;
di->bss_debug_bias = 0;
if (!VG_(clo_xml)) {
VG_(message)(Vg_UserMsg,
"Warning: the following file's .bss is "
"mapped r-x only - ignoring .bss syms\n");
VG_(message)(Vg_UserMsg, " %s\n", di->filename
? di->filename
: (UChar*)"(null?!)" );
}
} else
if ((!inrw) && (!inrx) && size >= 0 && !di->bss_present) {
/* File contains a .bss, but it didn't get mapped. Ignore. */
di->bss_present = False;
di->bss_svma = 0;
di->bss_avma = 0;
di->bss_size = 0;
di->bss_bias = 0;
} else {
BAD(".bss");
}
}
if (0 == VG_(strcmp)(name, ".sdynbss")) {
if (inrw && size >= 0 && !di->sbss_present) {
sdynbss_present = True;
di->sbss_present = True;
di->sbss_svma = svma;
di->sbss_avma = svma + inrw->bias;
di->sbss_size = size;
di->sbss_bias = inrw->bias;
di->sbss_debug_svma = svma;
di->sbss_debug_bias = inrw->bias;
TRACE_SYMTAB("acquiring .sdynbss svma = %#lx .. %#lx\n",
di->sbss_svma,
di->sbss_svma + di->sbss_size - 1);
TRACE_SYMTAB("acquiring .sdynbss avma = %#lx .. %#lx\n",
di->sbss_avma,
di->sbss_avma + di->sbss_size - 1);
TRACE_SYMTAB("acquiring .sdynbss bias = %#lx\n", di->sbss_bias);
}
}
/* Accept .sbss where mapped as rw (data) */
if (0 == VG_(strcmp)(name, ".sbss")) {
if (inrw && size > 0 && sdynbss_present) {
vg_assert(di->sbss_present);
sdynbss_present = False;
vg_assert(di->sbss_svma + di->sbss_size == svma);
di->sbss_size += size;
TRACE_SYMTAB("acquiring .sbss svma = %#lx .. %#lx\n",
svma, svma + size - 1);
TRACE_SYMTAB("acquiring .sbss avma = %#lx .. %#lx\n",
svma + inrw->bias, svma + inrw->bias + size - 1);
TRACE_SYMTAB("acquiring .sbss bias = %#lx\n", di->sbss_bias);
} else
if (inrw && size > 0 && !di->sbss_present) {
di->sbss_present = True;
di->sbss_svma = svma;
di->sbss_avma = svma + inrw->bias;
di->sbss_size = size;
di->sbss_bias = inrw->bias;
di->sbss_debug_svma = svma;
di->sbss_debug_bias = inrw->bias;
TRACE_SYMTAB("acquiring .sbss svma = %#lx .. %#lx\n",
di->sbss_svma,
di->sbss_svma + di->sbss_size - 1);
TRACE_SYMTAB("acquiring .sbss avma = %#lx .. %#lx\n",
di->sbss_avma,
di->sbss_avma + di->sbss_size - 1);
TRACE_SYMTAB("acquiring .sbss bias = %#lx\n", di->sbss_bias);
} else {
BAD(".sbss");
}
}
/* Accept .got where mapped as rw (data) */
if (0 == VG_(strcmp)(name, ".got")) {
if (inrw && size > 0 && !di->got_present) {
di->got_present = True;
di->got_avma = svma + inrw->bias;
di->got_size = size;
TRACE_SYMTAB("acquiring .got avma = %#lx\n", di->got_avma);
} else {
BAD(".got");
}
}
/* Accept .got.plt where mapped as rw (data) */
if (0 == VG_(strcmp)(name, ".got.plt")) {
if (inrw && size > 0 && !di->gotplt_present) {
di->gotplt_present = True;
di->gotplt_avma = svma + inrw->bias;
di->gotplt_size = size;
TRACE_SYMTAB("acquiring .got.plt avma = %#lx\n", di->gotplt_avma);
} else if (size != 0) {
BAD(".got.plt");
}
}
/* PLT is different on different platforms, it seems. */
# if defined(VGP_x86_linux) || defined(VGP_amd64_linux) \
|| defined(VGP_arm_linux) || defined (VGP_s390x_linux)
/* Accept .plt where mapped as rx (code) */
if (0 == VG_(strcmp)(name, ".plt")) {
if (inrx && size > 0 && !di->plt_present) {
di->plt_present = True;
di->plt_avma = svma + inrx->bias;
di->plt_size = size;
TRACE_SYMTAB("acquiring .plt avma = %#lx\n", di->plt_avma);
} else {
BAD(".plt");
}
}
# elif defined(VGP_ppc32_linux)
/* Accept .plt where mapped as rw (data) */
if (0 == VG_(strcmp)(name, ".plt")) {
if (inrw && size > 0 && !di->plt_present) {
di->plt_present = True;
di->plt_avma = svma + inrw->bias;
di->plt_size = size;
TRACE_SYMTAB("acquiring .plt avma = %#lx\n", di->plt_avma);
} else {
BAD(".plt");
}
}
# elif defined(VGP_ppc64_linux)
/* Accept .plt where mapped as rw (data), or unmapped */
if (0 == VG_(strcmp)(name, ".plt")) {
if (inrw && size > 0 && !di->plt_present) {
di->plt_present = True;
di->plt_avma = svma + inrw->bias;
di->plt_size = size;
TRACE_SYMTAB("acquiring .plt avma = %#lx\n", di->plt_avma);
} else
if ((!inrw) && (!inrx) && size > 0 && !di->plt_present) {
/* File contains a .plt, but it didn't get mapped.
Presumably it is not required on this platform. At
least don't reject the situation as invalid. */
di->plt_present = True;
di->plt_avma = 0;
di->plt_size = 0;
} else {
BAD(".plt");
}
}
# else
# error "Unsupported platform"
# endif
/* Accept .opd where mapped as rw (data) */
if (0 == VG_(strcmp)(name, ".opd")) {
if (inrw && size > 0 && !di->opd_present) {
di->opd_present = True;
di->opd_avma = svma + inrw->bias;
di->opd_size = size;
TRACE_SYMTAB("acquiring .opd avma = %#lx\n", di->opd_avma);
} else {
BAD(".opd");
}
}
/* Accept .eh_frame where mapped as rx (code). This seems to be
the common case. However, if that doesn't pan out, try for
rw (data) instead. We can handle up to N_EHFRAME_SECTS per
ELF object. */
if (0 == VG_(strcmp)(name, ".eh_frame")) {
if (inrx && size > 0 && di->n_ehframe < N_EHFRAME_SECTS) {
di->ehframe_avma[di->n_ehframe] = svma + inrx->bias;
di->ehframe_size[di->n_ehframe] = size;
TRACE_SYMTAB("acquiring .eh_frame avma = %#lx\n",
di->ehframe_avma[di->n_ehframe]);
di->n_ehframe++;
} else
if (inrw && size > 0 && di->n_ehframe < N_EHFRAME_SECTS) {
di->ehframe_avma[di->n_ehframe] = svma + inrw->bias;
di->ehframe_size[di->n_ehframe] = size;
TRACE_SYMTAB("acquiring .eh_frame avma = %#lx\n",
di->ehframe_avma[di->n_ehframe]);
di->n_ehframe++;
} else {
BAD(".eh_frame");
}
}
# undef BAD
}
if (0) VG_(printf)("YYYY text_: avma %#lx size %ld bias %#lx\n",
di->text_avma, di->text_size, di->text_bias);
if (VG_(clo_verbosity) > 2 || VG_(clo_trace_redir))
VG_(message)(Vg_DebugMsg, " svma %#010lx, avma %#010lx\n",
di->text_avma - di->text_bias,
di->text_avma );
TRACE_SYMTAB("\n");
TRACE_SYMTAB("------ Finding image addresses "
"for debug-info sections ------\n");
/* Find interesting sections, read the symbol table(s), read any debug
information */
{
/* IMAGE addresses: pointers to start of sections in the
transiently loaded oimage, not in the fragments of the file
mapped in by the guest's dynamic linker. */
UChar* strtab_img = NULL; /* .strtab */
ElfXX_Sym* symtab_img = NULL; /* .symtab */
UChar* dynstr_img = NULL; /* .dynstr */
ElfXX_Sym* dynsym_img = NULL; /* .dynsym */
UChar* debuglink_img = NULL; /* .gnu_debuglink */
UChar* stab_img = NULL; /* .stab (stabs) */
UChar* stabstr_img = NULL; /* .stabstr (stabs) */
UChar* debug_line_img = NULL; /* .debug_line (dwarf2) */
UChar* debug_info_img = NULL; /* .debug_info (dwarf2) */
UChar* debug_abbv_img = NULL; /* .debug_abbrev (dwarf2) */
UChar* debug_str_img = NULL; /* .debug_str (dwarf2) */
UChar* debug_ranges_img = NULL; /* .debug_ranges (dwarf2) */
UChar* debug_loc_img = NULL; /* .debug_loc (dwarf2) */
UChar* debug_frame_img = NULL; /* .debug_frame (dwarf2) */
UChar* dwarf1d_img = NULL; /* .debug (dwarf1) */
UChar* dwarf1l_img = NULL; /* .line (dwarf1) */
UChar* opd_img = NULL; /* .opd (dwarf2,
ppc64-linux) */
UChar* ehframe_img[N_EHFRAME_SECTS]; /* .eh_frame (dwarf2) */
/* Section sizes, in bytes */
SizeT strtab_sz = 0;
SizeT symtab_sz = 0;
SizeT dynstr_sz = 0;
SizeT dynsym_sz = 0;
SizeT debuglink_sz = 0;
SizeT stab_sz = 0;
SizeT stabstr_sz = 0;
SizeT debug_line_sz = 0;
SizeT debug_info_sz = 0;
SizeT debug_abbv_sz = 0;
SizeT debug_str_sz = 0;
SizeT debug_ranges_sz = 0;
SizeT debug_loc_sz = 0;
SizeT debug_frame_sz = 0;
SizeT dwarf1d_sz = 0;
SizeT dwarf1l_sz = 0;
SizeT opd_sz_unused = 0;
SizeT ehframe_sz[N_EHFRAME_SECTS];
for (i = 0; i < N_EHFRAME_SECTS; i++) {
ehframe_img[i] = NULL;
ehframe_sz[i] = 0;
}
/* Find all interesting sections */
UInt ehframe_ix = 0;
/* What FIND does: it finds the section called _SEC_NAME. The
size of it is assigned to _SEC_SIZE. The address of the
section in the transiently loaded oimage is assigned to
_SEC_IMG. If the section is found, _POST_FX is executed
after _SEC_NAME and _SEC_SIZE have been assigned to.
Even for sections which are marked loadable, the client's
ld.so may not have loaded them yet, so there is no guarantee
that we can safely prod around in any such area). Because
the entire object file is transiently mapped aboard for
inspection, it's always safe to inspect that area. */
/* Iterate over section headers (again) */
for (i = 0; i < ehdr_img->e_shnum; i++) {
# define FINDX(_sec_name, _sec_size, _sec_img, _post_fx) \
do { ElfXX_Shdr* shdr \
= INDEX_BIS( shdr_img, i, shdr_ent_szB ); \
if (0 == VG_(strcmp)(_sec_name, shdr_strtab_img \
+ shdr->sh_name)) { \
Bool nobits; \
_sec_img = (void*)(oimage + shdr->sh_offset); \
_sec_size = shdr->sh_size; \
nobits = shdr->sh_type == SHT_NOBITS; \
TRACE_SYMTAB( "%18s: img %p .. %p\n", \
_sec_name, (UChar*)_sec_img, \
((UChar*)_sec_img) + _sec_size - 1); \
/* SHT_NOBITS sections have zero size in the file. */ \
if ( shdr->sh_offset \
+ (nobits ? 0 : _sec_size) > n_oimage ) { \
ML_(symerr)(di, True, \
" section beyond image end?!"); \
goto out; \
} \
_post_fx; \
} \
} while (0);
/* Version with no post-effects */
# define FIND(_sec_name, _sec_size, _sec_img) \
FINDX(_sec_name, _sec_size, _sec_img, /**/)
/* NAME SIZE IMAGE addr */
FIND(".dynsym", dynsym_sz, dynsym_img)
FIND(".dynstr", dynstr_sz, dynstr_img)
FIND(".symtab", symtab_sz, symtab_img)
FIND(".strtab", strtab_sz, strtab_img)
FIND(".gnu_debuglink", debuglink_sz, debuglink_img)
FIND(".stab", stab_sz, stab_img)
FIND(".stabstr", stabstr_sz, stabstr_img)
FIND(".debug_line", debug_line_sz, debug_line_img)
FIND(".debug_info", debug_info_sz, debug_info_img)
FIND(".debug_abbrev", debug_abbv_sz, debug_abbv_img)
FIND(".debug_str", debug_str_sz, debug_str_img)
FIND(".debug_ranges", debug_ranges_sz, debug_ranges_img)
FIND(".debug_loc", debug_loc_sz, debug_loc_img)
FIND(".debug_frame", debug_frame_sz, debug_frame_img)
FIND(".debug", dwarf1d_sz, dwarf1d_img)
FIND(".line", dwarf1l_sz, dwarf1l_img)
FIND(".opd", opd_sz_unused, opd_img)
FINDX(".eh_frame", ehframe_sz[ehframe_ix],
ehframe_img[ehframe_ix],
do { ehframe_ix++; vg_assert(ehframe_ix <= N_EHFRAME_SECTS); }
while (0)
)
/* Comment_on_EH_FRAME_MULTIPLE_INSTANCES: w.r.t. .eh_frame
multi-instance kludgery, how are we assured that the order
in which we fill in ehframe_sz[] and ehframe_img[] is
consistent with the order in which we previously filled in
di->ehframe_avma[] and di->ehframe_size[] ? By the fact
that in both cases, these arrays were filled in by
iterating over the section headers top-to-bottom. So both
loops (this one and the previous one) encounter the
.eh_frame entries in the same order and so fill in these
arrays in a consistent order.
*/
# undef FINDX
# undef FIND
}
/* Look for a build-id */
buildid = find_buildid(oimage, n_oimage);
/* Look for a debug image */
if (buildid != NULL || debuglink_img != NULL) {
/* Do have a debuglink section? */
if (debuglink_img != NULL) {
UInt crc_offset = VG_ROUNDUP(VG_(strlen)(debuglink_img)+1, 4);
UInt crc;
vg_assert(crc_offset + sizeof(UInt) <= debuglink_sz);
/* Extract the CRC from the debuglink section */
crc = *(UInt *)(debuglink_img + crc_offset);
/* See if we can find a matching debug file */
dimage = find_debug_file( di, di->filename, buildid,
debuglink_img, crc, &n_dimage );
} else {
/* See if we can find a matching debug file */
dimage = find_debug_file( di, di->filename, buildid, NULL, 0, &n_dimage );
}
ML_(dinfo_free)(buildid);
if (dimage != 0
&& n_dimage >= sizeof(ElfXX_Ehdr)
&& ML_(is_elf_object_file)((void*)dimage, n_dimage)) {
/* Pull out and validate program header and section header info */
ElfXX_Ehdr* ehdr_dimg = (ElfXX_Ehdr*)dimage;
ElfXX_Phdr* phdr_dimg = (ElfXX_Phdr*)( ((UChar*)ehdr_dimg)
+ ehdr_dimg->e_phoff );
UWord phdr_dnent = ehdr_dimg->e_phnum;
UWord phdr_dent_szB = ehdr_dimg->e_phentsize;
ElfXX_Shdr* shdr_dimg = (ElfXX_Shdr*)( ((UChar*)ehdr_dimg)
+ ehdr_dimg->e_shoff );
UWord shdr_dnent = ehdr_dimg->e_shnum;
UWord shdr_dent_szB = ehdr_dimg->e_shentsize;
UChar* shdr_strtab_dimg = NULL;
/* SVMAs covered by rx and rw segments and corresponding bias. */
/* Addr rx_dsvma_base = 0; */ /* UNUSED */
Addr rx_dsvma_limit = 0;
PtrdiffT rx_dbias = 0;
/* Addr rw_dsvma_base = 0; */ /* UNUSED */
Addr rw_dsvma_limit = 0;
PtrdiffT rw_dbias = 0;
Bool need_symtab, need_stabs, need_dwarf2, need_dwarf1;
if (phdr_dnent == 0
|| !contained_within(
dimage, n_dimage,
(Addr)phdr_dimg, phdr_dnent * phdr_dent_szB)) {
ML_(symerr)(di, True,
"Missing or invalid ELF Program Header Table"
" (debuginfo file)");
goto out;
}
if (shdr_dnent == 0
|| !contained_within(
dimage, n_dimage,
(Addr)shdr_dimg, shdr_dnent * shdr_dent_szB)) {
ML_(symerr)(di, True,
"Missing or invalid ELF Section Header Table"
" (debuginfo file)");
goto out;
}
/* Also find the section header's string table, and validate. */
/* checked previously by is_elf_object_file: */
vg_assert( ehdr_dimg->e_shstrndx != SHN_UNDEF );
shdr_strtab_dimg
= (UChar*)( ((UChar*)ehdr_dimg)
+ shdr_dimg[ehdr_dimg->e_shstrndx].sh_offset);
if (!contained_within(
dimage, n_dimage,
(Addr)shdr_strtab_dimg,
1/*bogus, but we don't know the real size*/ )) {
ML_(symerr)(di, True,
"Invalid ELF Section Header String Table"
" (debuginfo file)");
goto out;
}
need_symtab = (NULL == symtab_img);
need_stabs = (NULL == stab_img);
need_dwarf2 = (NULL == debug_info_img);
need_dwarf1 = (NULL == dwarf1d_img);
for (i = 0; i < ehdr_dimg->e_phnum; i++) {
ElfXX_Phdr* phdr
= INDEX_BIS( (void*)(dimage + ehdr_dimg->e_phoff),
i, phdr_ent_szB );
if (phdr->p_type == PT_LOAD) {
if (rx_dsvma_limit == 0
&& phdr->p_offset >= di->rx_map_foff
&& phdr->p_offset < di->rx_map_foff + di->rx_map_size
&& phdr->p_offset + phdr->p_filesz <= di->rx_map_foff + di->rx_map_size) {
/* rx_dsvma_base = phdr->p_vaddr; */ /* UNUSED */
rx_dsvma_limit = phdr->p_vaddr + phdr->p_memsz;
rx_dbias = di->rx_map_avma - di->rx_map_foff + phdr->p_offset - phdr->p_vaddr;
}
else
if (rw_dsvma_limit == 0
&& phdr->p_offset >= di->rw_map_foff
&& phdr->p_offset < di->rw_map_foff + di->rw_map_size
&& phdr->p_offset + phdr->p_filesz <= di->rw_map_foff + di->rw_map_size) {
/* rw_dsvma_base = phdr->p_vaddr; */ /* UNUSED */
rw_dsvma_limit = phdr->p_vaddr + phdr->p_memsz;
rw_dbias = di->rw_map_avma - di->rw_map_foff + phdr->p_offset - phdr->p_vaddr;
}
}
}
/* Find all interesting sections */
for (i = 0; i < ehdr_dimg->e_shnum; i++) {
/* Find debug svma and bias information for sections
we found in the main file. */
# define FIND(sec, seg) \
do { ElfXX_Shdr* shdr \
= INDEX_BIS( shdr_dimg, i, shdr_dent_szB ); \
if (di->sec##_present \
&& 0 == VG_(strcmp)("." #sec, \
shdr_strtab_dimg + shdr->sh_name)) { \
vg_assert(di->sec##_size == shdr->sh_size); \
vg_assert(di->sec##_avma + shdr->sh_addr + seg##_dbias); \
/* Assume we have a correct value for the main */ \
/* object's bias. Use that to derive the debuginfo */ \
/* object's bias, by adding the difference in SVMAs */ \
/* for the corresponding sections in the two files. */ \
/* That should take care of all prelinking effects. */ \
di->sec##_debug_svma = shdr->sh_addr; \
di->sec##_debug_bias \
= di->sec##_bias + \
di->sec##_svma - di->sec##_debug_svma; \
TRACE_SYMTAB("acquiring ." #sec " debug svma = %#lx .. %#lx\n", \
di->sec##_debug_svma, \
di->sec##_debug_svma + di->sec##_size - 1); \
TRACE_SYMTAB("acquiring ." #sec " debug bias = %#lx\n", \
di->sec##_debug_bias); \
} \
} while (0);
/* SECTION SEGMENT */
FIND(text, rx)
FIND(data, rw)
FIND(sdata, rw)
FIND(rodata, rw)
FIND(bss, rw)
FIND(sbss, rw)
# undef FIND
/* Same deal as previous FIND, except only do it for those
sections for which we didn't find anything useful in
the main file. */
# define FIND(condition, sec_name, sec_size, sec_img) \
do { ElfXX_Shdr* shdr \
= INDEX_BIS( shdr_dimg, i, shdr_dent_szB ); \
if (condition \
&& 0 == VG_(strcmp)(sec_name, \
shdr_strtab_dimg + shdr->sh_name)) { \
Bool nobits; \
if (0 != sec_img) \
VG_(core_panic)("repeated section!\n"); \
sec_img = (void*)(dimage + shdr->sh_offset); \
sec_size = shdr->sh_size; \
nobits = shdr->sh_type == SHT_NOBITS; \
TRACE_SYMTAB( "%18s: dimg %p .. %p\n", \
sec_name, \
(UChar*)sec_img, \
((UChar*)sec_img) + sec_size - 1); \
/* SHT_NOBITS sections have zero size in the file. */ \
if ( shdr->sh_offset \
+ (nobits ? 0 : sec_size) > n_dimage ) { \
ML_(symerr)(di, True, \
" section beyond image end?!"); \
goto out; \
} \
} \
} while (0);
/* NEEDED? NAME SIZE IMAGE addr */
FIND(need_symtab, ".symtab", symtab_sz, symtab_img)
FIND(need_symtab, ".strtab", strtab_sz, strtab_img)
FIND(need_stabs, ".stab", stab_sz, stab_img)
FIND(need_stabs, ".stabstr", stabstr_sz, stabstr_img)
FIND(need_dwarf2, ".debug_line", debug_line_sz, debug_line_img)
FIND(need_dwarf2, ".debug_info", debug_info_sz, debug_info_img)
FIND(need_dwarf2, ".debug_abbrev", debug_abbv_sz, debug_abbv_img)
FIND(need_dwarf2, ".debug_str", debug_str_sz, debug_str_img)
FIND(need_dwarf2, ".debug_ranges", debug_ranges_sz,
debug_ranges_img)
FIND(need_dwarf2, ".debug_loc", debug_loc_sz, debug_loc_img)
FIND(need_dwarf2, ".debug_frame", debug_frame_sz,
debug_frame_img)
FIND(need_dwarf1, ".debug", dwarf1d_sz, dwarf1d_img)
FIND(need_dwarf1, ".line", dwarf1l_sz, dwarf1l_img)
# undef FIND
}
}
}
/* Check some sizes */
vg_assert((dynsym_sz % sizeof(ElfXX_Sym)) == 0);
vg_assert((symtab_sz % sizeof(ElfXX_Sym)) == 0);
/* Read symbols */
{
void (*read_elf_symtab)(struct _DebugInfo*,UChar*,
ElfXX_Sym*,SizeT,
UChar*,SizeT,
Bool,UChar*);
Bool symtab_in_debug;
# if defined(VGP_ppc64_linux)
read_elf_symtab = read_elf_symtab__ppc64_linux;
# else
read_elf_symtab = read_elf_symtab__normal;
# endif
symtab_in_debug = (Addr)symtab_img >= dimage
&& (Addr)symtab_img < dimage + n_dimage;
read_elf_symtab(di, "symbol table",
symtab_img, symtab_sz,
strtab_img, strtab_sz,
symtab_in_debug, opd_img);
read_elf_symtab(di, "dynamic symbol table",
dynsym_img, dynsym_sz,
dynstr_img, dynstr_sz,
False, opd_img);
}
/* Read .eh_frame and .debug_frame (call-frame-info) if any. Do
the .eh_frame section(s) first. */
vg_assert(di->n_ehframe >= 0 && di->n_ehframe <= N_EHFRAME_SECTS);
for (i = 0; i < di->n_ehframe; i++) {
/* see Comment_on_EH_FRAME_MULTIPLE_INSTANCES above for why
this next assertion should hold. */
vg_assert(ehframe_sz[i] == di->ehframe_size[i]);
ML_(read_callframe_info_dwarf3)( di,
ehframe_img[i],
ehframe_sz[i],
di->ehframe_avma[i],
True/*is_ehframe*/ );
}
if (debug_frame_sz) {
ML_(read_callframe_info_dwarf3)( di,
debug_frame_img, debug_frame_sz,
0/*assume zero avma*/,
False/*!is_ehframe*/ );
}
/* Read the stabs and/or dwarf2 debug information, if any. It
appears reading stabs stuff on amd64-linux doesn't work, so
we ignore it. On s390x stabs also doesnt work and we always
have the dwarf info in the eh_frame. We also segfault on
ppc64-linux when reading stabs, so skip that. ppc32-linux
seems OK though. Also skip on Android. */
# if !defined(VGP_amd64_linux) \
&& !defined(VGP_s390x_linux) \
&& !defined(VGP_ppc64_linux) \
&& !defined(VGPV_arm_linux_android)
if (stab_img && stabstr_img) {
ML_(read_debuginfo_stabs) ( di, stab_img, stab_sz,
stabstr_img, stabstr_sz );
}
# endif
/* jrs 2006-01-01: icc-8.1 has been observed to generate
binaries without debug_str sections. Don't preclude
debuginfo reading for that reason, but, in
read_unitinfo_dwarf2, do check that debugstr is non-NULL
before using it. */
if (debug_info_img && debug_abbv_img && debug_line_img
/* && debug_str_img */) {
/* The old reader: line numbers and unwind info only */
ML_(read_debuginfo_dwarf3) ( di,
debug_info_img, debug_info_sz,
debug_abbv_img, debug_abbv_sz,
debug_line_img, debug_line_sz,
debug_str_img, debug_str_sz );
/* The new reader: read the DIEs in .debug_info to acquire
information on variable types and locations. But only if
the tool asks for it, or the user requests it on the
command line. */
if (VG_(needs).var_info /* the tool requires it */
|| VG_(clo_read_var_info) /* the user asked for it */) {
ML_(new_dwarf3_reader)(
di, debug_info_img, debug_info_sz,
debug_abbv_img, debug_abbv_sz,
debug_line_img, debug_line_sz,
debug_str_img, debug_str_sz,
debug_ranges_img, debug_ranges_sz,
debug_loc_img, debug_loc_sz
);
}
}
if (dwarf1d_img && dwarf1l_img) {
ML_(read_debuginfo_dwarf1) ( di, dwarf1d_img, dwarf1d_sz,
dwarf1l_img, dwarf1l_sz );
}
}
res = True;
/* If reading Dwarf3 variable type/location info, print a line
showing the number of variables read for each object.
(Currently disabled -- is a sanity-check mechanism for
exp-sgcheck.) */
if (0 && (VG_(needs).var_info || VG_(clo_read_var_info))) {
UWord nVars = 0;
Word j;
if (di->varinfo) {
for (j = 0; j < VG_(sizeXA)(di->varinfo); j++) {
OSet* /* of DiAddrRange */ scope
= *(OSet**)VG_(indexXA)(di->varinfo, j);
vg_assert(scope);
VG_(OSetGen_ResetIter)( scope );
while (True) {
DiAddrRange* range = VG_(OSetGen_Next)( scope );
if (!range) break;
vg_assert(range->vars);
Word w = VG_(sizeXA)(range->vars);
vg_assert(w >= 0);
if (0) VG_(printf)("range %#lx %#lx %ld\n",
range->aMin, range->aMax, w);
nVars += (UWord)w;
}
}
}
VG_(umsg)("VARINFO: %7lu vars %7ld text_size %s\n",
nVars, di->text_size, di->filename);
}
out: {
SysRes m_res;
/* Last, but not least, heave the image(s) back overboard. */
if (dimage) {
m_res = VG_(am_munmap_valgrind) ( dimage, n_dimage );
vg_assert(!sr_isError(m_res));
}
m_res = VG_(am_munmap_valgrind) ( oimage, n_oimage );
vg_assert(!sr_isError(m_res));
return res;
}
}
#endif // defined(VGO_linux)
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/
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