Hi, what is the data format of "initial_location" and "address_range" in the .eh_frame section of an ELF64 binary? I read the DWARF specification which says: "initial_location (target address): An addressing-unit sized constant indicating the address of the first location associated with this table entry." and "address_range (target address): An addressing unit sized constant indicating the number of bytes of program instructions described by this entry." Because I'm building for x86-64 I thought that must be 64 bit, but that seems to be wrong. So I examined the binary with readelf and objdump: ____________________________________________________________________ READELF: Contents of the .eh_frame section: 00000000 0000001c 00000000 CIE Version: 1 Augmentation: "zPR" Code alignment factor: 1 Data alignment factor: -8 Return address column: 16 Augmentation data: 00 54 23 00 00 00 00 00 00 1b DW_CFA_def_cfa: r7 (rsp) ofs 8 DW_CFA_offset: r16 (rip) at cfa-8 00000020 0000001c 00000024 FDE cie=00000000 pc=000000ec..000000f6 DW_CFA_advance_loc: 1 to 000000ed DW_CFA_def_cfa_offset: 16 DW_CFA_advance_loc: 3 to 000000f0 DW_CFA_offset: r6 (rbp) at cfa-16 DW_CFA_def_cfa_register: r6 (rbp) DW_CFA_advance_loc: 5 to 000000f5 DW_CFA_def_cfa: r7 (rsp) ofs 8 DW_CFA_nop DW_CFA_nop DW_CFA_nop ____________________________________________________________________ OBJDUMP: Contents of section .eh_frame: 3b78 1c000000 00000000 017a5052 00017810 .........zPR..x. 3b88 0a005423 00000000 00001b0c 07089001 ..T#............ 3b98 1c000000 24000000 4cc5ffff 0a000000 ....$...L....... 3ba8 00410e10 4386020d 06450c07 08000000 .A..C....E...... According to the above output of readelf the value of address_range should be 0xf6 - 0xec = 0xa. This value is at address 0x3ba4 and seems to be 32 bit wide. initial_location hast to be at address 0x3ba0, is 32 bit wide too and has a quite weird value. So please tell what am I doing wrong here? Martin
