int
_dwarf_transform_arange_to_disk(Dwarf_P_Debug dbg, 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 uword_size = dbg->de_offset_size;
int upointer_size = dbg->de_pointer_size;
int res = 0;
/* ***** BEGIN CODE ***** */
/* Size of the .debug_aranges section header. */
arange_num_bytes = extension_word_size +
uword_size + /* Size of length field. */
sizeof(Dwarf_Half) + /* Size of version field. */
uword_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 (arange == NULL) {
_dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL);
return (0);
}
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 - uword_size
- extension_word_size;
{
Dwarf_Unsigned du = adjusted_length;
WRITE_UNALIGNED(dbg, (void *) arange_ptr,
(const void *) &du, sizeof(du), uword_size);
arange_ptr += uword_size;
}
/* Write the version as 2 bytes. */
{
Dwarf_Half verstamp = CURRENT_VERSION_STAMP;
WRITE_UNALIGNED(dbg, (void *) arange_ptr,
(const void *) &verstamp,
sizeof(verstamp), sizeof(Dwarf_Half));
arange_ptr += sizeof(Dwarf_Half);
}
/* Write the .debug_info offset. This is always 0. */
WRITE_UNALIGNED(dbg, (void *) arange_ptr,
(const void *) &big_zero,
sizeof(big_zero), uword_size);
arange_ptr += uword_size;
{
unsigned long count = dbg->de_arange_count + 1;
int res = 0;
if (dbg->de_reloc_pair) {
count = (3 * dbg->de_arange_count) + 1;
}
/* The following is a small optimization: not needed for
correctness */
res = _dwarf_pro_pre_alloc_n_reloc_slots(dbg,
DEBUG_ARANGES, count);
if (res != DW_DLV_OK) {
_dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL);
return (0);
}
}
/* reloc for .debug_info */
res = dbg->de_reloc_name(dbg,
DEBUG_ARANGES,
extension_word_size +
uword_size + sizeof(Dwarf_Half),
dbg->de_sect_name_idx[DEBUG_INFO],
dwarf_drt_data_reloc, uword_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_reloc_name(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 (0);
}
/* 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_reloc_pair &&
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_reloc_pair(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 (0);
}
/* 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);
return (int) dbg->de_n_debug_sect;
}
