This is the mail archive of the binutils@sourceware.org mailing list for the binutils project.
Index Nav: | [Date Index] [Subject Index] [Author Index] [Thread Index] | |
---|---|---|
Message Nav: | [Date Prev] [Date Next] | [Thread Prev] [Thread Next] |
Other format: | [Raw text] |
Hi. I've hope I've come to the correct mailing list: I have a small, noobish question about GAS syntax. How does one write a short, relative jump in GAS syntax, i.e., with an 8 bit operand and without using a symbol? For example, we can do this: code ---------- $ cat symboljmp.S .text nop nop nop jmp .L0 nop nop nop nop .L0: nop nop nop nop $ as symboljmp.S -o symboljmp.o $ objdump symboljmp.o -d symboljmp.o: file format elf64-x86-64 Disassembly of section .text: 0000000000000000 <.text>: 0: 90 nop 1: 90 nop 2: 90 nop 3: eb 04 jmp 0x9 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop ---------- And it seems to be using a nice, tiny 8 bit operand pointing ahead 4 bytes. But if one does something like jmp 4(%eip) then one gets a huge 4 byte operand. Same question goes for the conditional jumps (jne, etc.) -- frigidcode.com indicium.us
Attachment:
signature.asc
Description: OpenPGP digital signature
Index Nav: | [Date Index] [Subject Index] [Author Index] [Thread Index] | |
---|---|---|
Message Nav: | [Date Prev] [Date Next] | [Thread Prev] [Thread Next] |