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; }