Hi list, I try to extract function assembly code with objdump using "--start-address" and "--stop-address" options but the stop address stop on the second to last address.
Exemple : Extraction of "printf_size_info" function form "libc.so.6" - Get "printf_size_info" function symbol address $ objdump -T /lib/x86_64-linux-gnu/libc.so.6 | grep printf_size_info 0000000000050c40 g DF .text 000000000000001f GLIBC_2.2.5 printf_size_info - Add the size of the function (4th column) to the base address of the function (1st column) to get the ending address 0x50c40+0x1f = 0x50c5f - Extract the function assembly code $ objdump --start-address=0x50c40 --stop-address=0x50c5f -d /lib/x86_64-linux-gnu/libc.so.6 /lib/x86_64-linux-gnu/libc.so.6: format de fichier elf64-x86-64 Déassemblage de la section .text : 0000000000050c40 <printf_size_info@@GLIBC_2.2.5>: 50c40: 48 85 f6 test %rsi,%rsi 50c43: 74 14 je 50c59 <printf_size_info@@GLIBC_2.2.5+0x19> 50c45: 0f b6 47 0c movzbl 0xc(%rdi),%eax 50c49: 83 e0 01 and $0x1,%eax 50c4c: 3c 01 cmp $0x1,%al 50c4e: 19 c0 sbb %eax,%eax 50c50: 30 c0 xor %al,%al 50c52: 05 07 01 00 00 add $0x107,%eax 50c57: 89 02 mov %eax,(%rdx) 50c59: b8 01 00 00 00 mov $0x1,%eax 50c5e: c3 retq As you can see the last address is wrong. The assembly code stop on 0x50c5e instead of 0x50c5f. I've tried on these versions : - "GNU objdump (GNU Binutils) 2.27" version from the official mirror (http://ftp.gnu.org/gnu/binutils/). - "GNU objdump (GNU Binutils for Debian) 2.25" from the offical Debian Jessie repository. My Linux installation is : "3.16.0-4-amd64 #1 SMP Debian 3.16.36-1+deb8u2 (2016-10-19) x86_64 GNU/Linux" Full updated. Thank you Florian
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