/*
This function performs error handling as described in the
libdwarf consumer document section 3. Dbg is the Dwarf_P_debug
structure being processed. Error is a pointer to the pointer
to the error descriptor that will be returned. Errval is an
error code listed in dwarf_error.h.
*/
void
_dwarf_p_error(Dwarf_P_Debug dbg,
Dwarf_Error * error, Dwarf_Word errval)
{
Dwarf_Error errptr;
/* Allow NULL dbg on entry, since sometimes that can happen and we
want to report the upper-level error, not this one. */
if ((Dwarf_Sword) errval < 0)
printf("ERROR VALUE: %ld - %s\n",
(long) errval, _dwarf_errmsgs[-errval - 1]);
if (error != NULL) {
errptr = (Dwarf_Error)
_dwarf_p_get_alloc(dbg, sizeof(struct Dwarf_Error_s));
if (errptr == NULL) {
fprintf(stderr,
"Could not allocate Dwarf_Error structure\n");
abort();
}
errptr->er_errval = (Dwarf_Sword) errval;
*error = errptr;
return;
}
if (dbg != NULL && dbg->de_errhand != NULL) {
errptr = (Dwarf_Error)
_dwarf_p_get_alloc(dbg, sizeof(struct Dwarf_Error_s));
if (errptr == NULL) {
fprintf(stderr,
"Could not allocate Dwarf_Error structure\n");
abort();
}
errptr->er_errval = (Dwarf_Sword) errval;
dbg->de_errhand(errptr, dbg->de_errarg);
return;
}
abort();
}
int
_dwarf_transform_arange_to_disk(Dwarf_P_Debug dbg,
Dwarf_Signed *nbufs, Dwarf_Error * error)
{
/* Total num of bytes in .debug_aranges section. */
Dwarf_Unsigned arange_num_bytes = 0;
/* Adjustment to align the start of the actual address ranges on a
boundary aligned with twice the address size. */
Dwarf_Small remainder = 0;
/* Total number of bytes excluding the length field. */
Dwarf_Unsigned adjusted_length = 0;
/* Points to first byte of .debug_aranges buffer. */
Dwarf_Small *arange = 0;
/* Fills in the .debug_aranges buffer. */
Dwarf_Small *arange_ptr = 0;
/* Scans the list of address ranges provided by user. */
Dwarf_P_Arange given_arange = 0;
/* Used to fill in 0. */
const Dwarf_Signed big_zero = 0;
int extension_word_size = dbg->de_64bit_extension ? 4 : 0;
int offset_size = dbg->de_offset_size;
int upointer_size = dbg->de_pointer_size;
/* All dwarf versions so far use 2 here. */
Dwarf_Half version = 2;
int res = 0;
/* ***** BEGIN CODE ***** */
/* Size of the .debug_aranges section header. */
arange_num_bytes = extension_word_size +
offset_size + /* Size of length field. */
DWARF_HALF_SIZE + /* Size of version field. */
offset_size + /* Size of .debug_info offset. */
sizeof(Dwarf_Small) + /* Size of address size field. */
sizeof(Dwarf_Small); /* Size of segment size field. */
/* Adjust the size so that the set of aranges begins on a boundary
that aligned with twice the address size. This is a Libdwarf
requirement. */
remainder = arange_num_bytes % (2 * upointer_size);
if (remainder != 0)
arange_num_bytes += (2 * upointer_size) - remainder;
/* Add the bytes for the actual address ranges. */
arange_num_bytes += upointer_size * 2 * (dbg->de_arange_count + 1);
GET_CHUNK(dbg, dbg->de_elf_sects[DEBUG_ARANGES],
arange, (unsigned long) arange_num_bytes, error);
arange_ptr = arange;
if (extension_word_size) {
Dwarf_Word x = DISTINGUISHED_VALUE;
WRITE_UNALIGNED(dbg, (void *) arange_ptr,
(const void *) &x,
sizeof(x), extension_word_size);
arange_ptr += extension_word_size;
}
/* Write the total length of .debug_aranges section. */
adjusted_length = arange_num_bytes - offset_size
- extension_word_size;
{
Dwarf_Unsigned du = adjusted_length;
WRITE_UNALIGNED(dbg, (void *) arange_ptr,
(const void *) &du, sizeof(du), offset_size);
arange_ptr += offset_size;
}
/* Write the version as 2 bytes. */
{
Dwarf_Half verstamp = version;
WRITE_UNALIGNED(dbg, (void *) arange_ptr,
(const void *) &verstamp,
sizeof(verstamp), DWARF_HALF_SIZE);
arange_ptr += DWARF_HALF_SIZE;
}
/* Write the .debug_info offset. This is always 0. */
WRITE_UNALIGNED(dbg, (void *) arange_ptr,
(const void *) &big_zero,
sizeof(big_zero), offset_size);
arange_ptr += offset_size;
{
unsigned long count = dbg->de_arange_count + 1;
int res2 = 0;
Dwarf_P_Per_Reloc_Sect p_reloc =
&dbg->de_reloc_sect[DEBUG_ARANGES];
if (dbg->de_relocate_pair_by_symbol) {
count = (3 * dbg->de_arange_count) + 1;
}
/* The following is a small optimization: not needed for
correctness. Does nothing if
preloc->pr_first_block is non-null */
res2 = _dwarf_pro_pre_alloc_specific_reloc_slots(dbg,
p_reloc, count);
if (res2 != DW_DLV_OK) {
_dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL);
return DW_DLV_ERROR;
}
}
/* reloc for .debug_info */
res = dbg->de_relocate_by_name_symbol(dbg,
DEBUG_ARANGES,
extension_word_size +
offset_size + DWARF_HALF_SIZE,
dbg->de_sect_name_idx[DEBUG_INFO],
dwarf_drt_data_reloc, offset_size);
/* Write the size of addresses. */
*arange_ptr = dbg->de_pointer_size;
arange_ptr++;
/* Write the size of segment addresses. This is zero for MIPS
architectures. */
*arange_ptr = 0;
arange_ptr++;
/* Skip over the padding to align the start of the actual address
ranges to twice the address size. */
if (remainder != 0)
arange_ptr += (2 * upointer_size) - remainder;
/* The arange address, length are pointer-size fields of the target
machine. */
for (given_arange = dbg->de_arange; given_arange != NULL;
given_arange = given_arange->ag_next) {
/* Write relocation record for beginning of address range. */
res = dbg->de_relocate_by_name_symbol(dbg, DEBUG_ARANGES,
arange_ptr - arange, /* r_offset */
(long) given_arange->ag_symbol_index,
dwarf_drt_data_reloc, upointer_size);
if (res != DW_DLV_OK) {
_dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL);
return DW_DLV_ERROR;
}
/* Copy beginning address of range. */
WRITE_UNALIGNED(dbg, (void *) arange_ptr,
(const void *) &given_arange->ag_begin_address,
sizeof(given_arange->ag_begin_address),
upointer_size);
arange_ptr += upointer_size;
if (dbg->de_relocate_pair_by_symbol &&
given_arange->ag_end_symbol_index != 0 &&
given_arange->ag_length == 0) {
/* symbolic reloc, need reloc for length What if we really
know the length? If so, should use the other part of
'if'. */
Dwarf_Unsigned val;
res = dbg->de_relocate_pair_by_symbol(dbg,
DEBUG_ARANGES,
arange_ptr - arange, /* r_offset */
given_arange->ag_symbol_index,
given_arange->ag_end_symbol_index,
dwarf_drt_first_of_length_pair,
upointer_size);
if (res != DW_DLV_OK) {
_dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL);
return DW_DLV_ERROR;
}
/* arange pre-calc so assem text can do .word end - begin
+ val (gets val from stream) */
val = given_arange->ag_end_symbol_offset -
given_arange->ag_begin_address;
WRITE_UNALIGNED(dbg, (void *) arange_ptr,
(const void *) &val,
sizeof(val), upointer_size);
arange_ptr += upointer_size;
} else {
/* plain old length to copy, no relocation at all */
WRITE_UNALIGNED(dbg, (void *) arange_ptr,
(const void *) &given_arange->ag_length,
sizeof(given_arange->ag_length),
upointer_size);
arange_ptr += upointer_size;
}
}
WRITE_UNALIGNED(dbg, (void *) arange_ptr,
(const void *) &big_zero,
sizeof(big_zero), upointer_size);
arange_ptr += upointer_size;
WRITE_UNALIGNED(dbg, (void *) arange_ptr,
(const void *) &big_zero,
sizeof(big_zero), upointer_size);
*nbufs = dbg->de_n_debug_sect;
return DW_DLV_OK;
}
/*
Ensure each stream is a single buffer and
add that single buffer to the set of stream buffers.
By creating a new buffer and copying if necessary.
Free the input set of buffers if we consolidate.
Return -1 on error (malloc failure)
Return DW_DLV_OK on success. Any other return indicates
malloc failed.
*/
int
_dwarf_stream_relocs_to_disk(Dwarf_P_Debug dbg,
Dwarf_Signed * new_sec_count)
{
unsigned long total_size = 0;
Dwarf_Small *data = 0;
int sec_index = 0;
unsigned long i = 0;
Dwarf_Error err = 0;
Dwarf_Error *error = &err;
Dwarf_Signed sec_count = 0;
Dwarf_P_Per_Reloc_Sect p_reloc = &dbg->de_reloc_sect[0];
for (i = 0; i < NUM_DEBUG_SECTIONS; ++i, ++p_reloc) {
unsigned long ct = p_reloc->pr_reloc_total_count;
unsigned len = 0;
struct Dwarf_P_Relocation_Block_s *p_blk = 0;
struct Dwarf_P_Relocation_Block_s *p_blk_last = 0;
Dwarf_P_Per_Reloc_Sect prb = 0;
if (ct == 0) {
continue;
}
prb = &dbg->de_reloc_sect[i];
len = dbg->de_relocation_record_size;
++sec_count;
total_size = ct * len;
sec_index = prb->pr_sect_num_of_reloc_sect;
if (sec_index == 0) {
/* call de_func or de_func_b, getting section number of
reloc sec */
int rel_section_index = 0;
Dwarf_Unsigned name_idx = 0;
int int_name = 0;
int err = 0;
if (dbg->de_func_b) {
rel_section_index =
dbg->de_func_b(_dwarf_rel_section_names[i],
/* size */
dbg->de_relocation_record_size,
/* type */ SHT_REL,
/* flags */ 0,
/* link to symtab, which we cannot
know */ 0,
/* info == link to sec rels apply to
*/
dbg->de_elf_sects[i],
&name_idx, &err);
} else {
rel_section_index =
dbg->de_func(_dwarf_rel_section_names[i],
/* size */
dbg->de_relocation_record_size,
/* type */ SHT_REL,
/* flags */ 0,
/* link to symtab, which we cannot
know */ 0,
/* info == link to sec rels apply to */
dbg->de_elf_sects[i], &int_name, &err);
name_idx = int_name;
}
if (rel_section_index == -1) {
{
_dwarf_p_error(dbg, error, DW_DLE_ELF_SECT_ERR);
return (DW_DLV_ERROR);
}
}
prb->pr_sect_num_of_reloc_sect = rel_section_index;
sec_index = rel_section_index;
}
GET_CHUNK(dbg, sec_index, data, total_size, &err);
p_blk = p_reloc->pr_first_block;
/* following loop executes at least once. Effects the
consolidation to a single block or, if already a single
block, simply copies to the output buffer. And frees the
input block. The new block is in the de_debug_sects list. */
while (p_blk) {
unsigned long len =
p_blk->rb_where_to_add_next - p_blk->rb_data;
memcpy(data, p_blk->rb_data, len);
data += len;
p_blk_last = p_blk;
p_blk = p_blk->rb_next;
_dwarf_p_dealloc(dbg, (Dwarf_Small *) p_blk_last);
}
/* ASSERT: sum of len copied == total_size */
/*
We have copied the input, now drop the pointers to it. For
debugging, leave the other data untouched. */
p_reloc->pr_first_block = 0;
p_reloc->pr_last_block = 0;
}
*new_sec_count = sec_count;
return DW_DLV_OK;
}
/*
_dwarf_transform_simplename_to_disk writes
".rel.debug_pubnames",
".rel.debug_funcnames", sgi extension
".rel.debug_typenames", sgi extension
".rel.debug_varnames", sgi extension
".rel.debug_weaknames", sgi extension
to disk.
section_index indexes one of those sections.
entrykind is one of those 'kind's.
*/
int
_dwarf_transform_simplename_to_disk(Dwarf_P_Debug dbg, enum dwarf_sn_kind entrykind, int section_index, /* in
de_elf_sects
etc
*/
Dwarf_Error * error)
{
/* Used to fill in 0. */
const Dwarf_Signed big_zero = 0;
/* Used to scan the section data buffers. */
Dwarf_P_Section_Data debug_sect;
Dwarf_Signed debug_info_size;
Dwarf_P_Simple_nameentry nameentry_original;
Dwarf_P_Simple_nameentry nameentry;
Dwarf_Small *stream_bytes;
Dwarf_Small *cur_stream_bytes_ptr;
Dwarf_Unsigned stream_bytes_count;
Dwarf_Unsigned adjusted_length; /* count excluding length field
*/
int uword_size = dbg->de_offset_size;
int extension_size = dbg->de_64bit_extension ? 4 : 0;
Dwarf_P_Simple_name_header hdr;
/* ***** BEGIN CODE ***** */
debug_info_size = 0;
for (debug_sect = dbg->de_debug_sects; debug_sect != NULL;
debug_sect = debug_sect->ds_next) {
/* We want the size of the .debug_info section for this CU
because the dwarf spec requires us to output it below so we
look for it specifically. */
if (debug_sect->ds_elf_sect_no == dbg->de_elf_sects[DEBUG_INFO]) {
debug_info_size += debug_sect->ds_nbytes;
}
}
hdr = &dbg->de_simple_name_headers[entrykind];
/* Size of the .debug_typenames (or similar) section header. */
stream_bytes_count = extension_size + uword_size + /* Size of
length
field. */
sizeof(Dwarf_Half) + /* Size of version field. */
uword_size + /* Size of .debug_info offset. */
uword_size; /* Size of .debug_names. */
nameentry_original = hdr->sn_head;
nameentry = nameentry_original;
/* add in the content size */
stream_bytes_count += hdr->sn_net_len;
/* Size of the last 0 offset. */
stream_bytes_count += uword_size;
/* Now we know how long the entire section is */
GET_CHUNK(dbg, dbg->de_elf_sects[section_index],
stream_bytes, (unsigned long) stream_bytes_count, error);
if (stream_bytes == NULL) {
_dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL);
return (0);
}
cur_stream_bytes_ptr = stream_bytes;
if (extension_size) {
Dwarf_Unsigned x = DISTINGUISHED_VALUE;
WRITE_UNALIGNED(dbg, cur_stream_bytes_ptr,
(const void *) &x, sizeof(x), extension_size);
cur_stream_bytes_ptr += extension_size;
}
/* Write the adjusted length of .debug_*names section. */
adjusted_length = stream_bytes_count - uword_size - extension_size;
WRITE_UNALIGNED(dbg, cur_stream_bytes_ptr,
(const void *) &adjusted_length,
sizeof(adjusted_length), uword_size);
cur_stream_bytes_ptr += uword_size;
/* Write the version as 2 bytes. */
{
Dwarf_Half verstamp = CURRENT_VERSION_STAMP;
WRITE_UNALIGNED(dbg, cur_stream_bytes_ptr,
(const void *) &verstamp,
sizeof(verstamp), sizeof(Dwarf_Half));
cur_stream_bytes_ptr += sizeof(Dwarf_Half);
}
/* Write the offset of the compile-unit. */
WRITE_UNALIGNED(dbg, cur_stream_bytes_ptr,
(const void *) &big_zero,
sizeof(big_zero), uword_size);
cur_stream_bytes_ptr += uword_size;
/* now create the relocation for the compile_unit offset */
{
int res = dbg->de_reloc_name(dbg,
section_index,
extension_size + uword_size +
sizeof(Dwarf_Half)
/* r_offset */
,
/* debug_info section name symbol */
dbg->de_sect_name_idx[DEBUG_INFO],
dwarf_drt_data_reloc,
uword_size);
if (res != DW_DLV_OK) {
{
_dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL);
return (0);
}
}
}
/* Write the size of .debug_info section. */
WRITE_UNALIGNED(dbg, cur_stream_bytes_ptr,
(const void *) &debug_info_size,
sizeof(debug_info_size), uword_size);
cur_stream_bytes_ptr += uword_size;
for (nameentry = nameentry_original;
nameentry != NULL; nameentry = nameentry->sne_next) {
/* Copy offset of die from start of compile-unit. */
WRITE_UNALIGNED(dbg, cur_stream_bytes_ptr,
(const void *) &nameentry->sne_die->di_offset,
sizeof(nameentry->sne_die->di_offset),
uword_size);
cur_stream_bytes_ptr += uword_size;
/* Copy the type name. */
strcpy((char *) cur_stream_bytes_ptr, nameentry->sne_name);
cur_stream_bytes_ptr += nameentry->sne_name_len + 1;
}
WRITE_UNALIGNED(dbg, cur_stream_bytes_ptr,
(const void *) &big_zero,
sizeof(big_zero), uword_size);
return (int) dbg->de_n_debug_sect;
}
/*
Ensure each stream is a single buffer and
add that single buffer to the set of stream buffers.
By creating a new buffer and copying if necessary.
(If > 1 block, reduce to 1 block)
Free the input set of buffers if we consolidate.
We pass back *new_sec_count as zero because we
are not creating normal sections for a .o, but
symbolic relocations, separately counted.
Return -1 on error (malloc failure)
Return DW_DLV_OK on success. Any other return indicates
malloc failed.
*/
int
_dwarf_symbolic_relocs_to_disk(Dwarf_P_Debug dbg,
Dwarf_Signed * new_sec_count)
{
/* unsigned long total_size =0; */
Dwarf_Small *data;
int sec_index;
int res;
unsigned long i;
Dwarf_Error error;
Dwarf_Signed sec_count = 0;
Dwarf_P_Per_Reloc_Sect p_reloc = &dbg->de_reloc_sect[0];
for (i = 0; i < NUM_DEBUG_SECTIONS; ++i, ++p_reloc) {
unsigned long ct = p_reloc->pr_reloc_total_count;
struct Dwarf_P_Relocation_Block_s *p_blk;
struct Dwarf_P_Relocation_Block_s *p_blk_last;
/* int len */
int err;
if (ct == 0) {
continue;
}
/* len = dbg->de_relocation_record_size; */
++sec_count;
/* total_size = ct *len; */
sec_index = p_reloc->pr_sect_num_of_reloc_sect;
if (sec_index == 0) {
/* call de_func or de_func_b, getting section number of
reloc sec */
int rel_section_index;
int int_name;
Dwarf_Unsigned name_idx;
/*
This is a bit of a fake, as we do not really have true
elf sections at all. Just the data such might contain.
But this lets the caller eventually link things
together: without this call we would not know what rel
data goes with what section when we are asked for the
real arrays. */
if (dbg->de_func_b) {
rel_section_index =
dbg->de_func_b(_dwarf_rel_section_names[i],
dbg->de_relocation_record_size,
/* type */ SHT_REL,
/* flags */ 0,
/* link to symtab, which we cannot
know */ SHN_UNDEF,
/* sec rels apply to */
dbg->de_elf_sects[i],
&name_idx, &err);
} else {
rel_section_index =
dbg->de_func(_dwarf_rel_section_names[i],
dbg->de_relocation_record_size,
/* type */ SHT_REL,
/* flags */ 0,
/* link to symtab, which we cannot
know */ SHN_UNDEF,
/* sec rels apply to, in elf, sh_info */
dbg->de_elf_sects[i], &int_name, &err);
name_idx = int_name;
}
if (rel_section_index == -1) {
{
_dwarf_p_error(dbg, &error, DW_DLE_ELF_SECT_ERR);
return (DW_DLV_ERROR);
}
}
p_reloc->pr_sect_num_of_reloc_sect = rel_section_index;
sec_index = rel_section_index;
}
p_blk = p_reloc->pr_first_block;
if (p_reloc->pr_block_count > 1) {
struct Dwarf_P_Relocation_Block_s *new_blk;
/* HACK , not normal interfaces, trashing p_reloc
current contents! */
_dwarf_reset_reloc_sect_info(p_reloc, ct);
/* Creating new single block for all 'ct' entries */
res = _dwarf_pro_pre_alloc_n_reloc_slots(dbg, (int) i, ct);
if (res != DW_DLV_OK) {
return res;
}
new_blk = p_reloc->pr_first_block;
data = (Dwarf_Small *) new_blk->rb_data;
/* The following loop does the consolidation to a
single block and frees the input block(s). */
do {
unsigned long len =
p_blk->rb_where_to_add_next - p_blk->rb_data;
memcpy(data, p_blk->rb_data, len);
data += len;
p_blk_last = p_blk;
p_blk = p_blk->rb_next;
_dwarf_p_dealloc(dbg, (Dwarf_Small *) p_blk_last);
} while (p_blk) ;
/* ASSERT: sum of len copied == total_size */
new_blk->rb_next_slot_to_use = ct;
new_blk->rb_where_to_add_next = (char *) data;
p_reloc->pr_reloc_total_count = ct;
/* have now created a single block, but no change in slots
used (pr_reloc_total_count) */
}
}
*new_sec_count = 0;
return DW_DLV_OK;
}