What would be the proper gcc compilable GAS ASM code to store my constant $3360220 in a memory location 0x7FFFFFFFb098? Will this produce the desired result? Is it ok that the movabs instruction "spills" on the next line? added question: my disassembled code looks like this eventhough i wrote
jmp 0x401070
, why is that and how do i fix it? it also converted my movq to movabs
0: 49 c7 c1 dc 45 33 00 mov $0x3345dc,%r9
7: 49 ba 98 f0 ff ff ff movabs $0x7fffffff098,%r10
e: 07 00 00
11: 4d 89 0a mov %r9,(%r10)
14: e9 00 00 00 00 jmpq 0x19
I made the .d file in linux x86-64 using objdump -d file.o > file.d. How do I use the proper linking?
I mistyped the address at first missing the "b" in the hex.Sorry for that.
I solved my problem pushing the address on the stack and returning.
0000000000000000 <.text>:
0: 49 c7 c1 dc 45 33 00 mov $0x3345dc,%r9
7: 4c 8d 54 24 08 lea 0x8(%rsp),%r10
c: 4d 89 0a mov %r9,(%r10)
f: ff 34 25 70 10 40 00 pushq 0x401070
16: c3 retq
The problem was that one cannot easily specify a 64bit address in a jmp instruction. The assembler does not know where is this code going to be, it sets aside 32-bits for a near jump and adds a relocation section that tells the linker to update this region with the correct data.