[llvm-dev] How to get absolute address of llvm-objdump

[Fāng-ruì Sòng via llvm-dev]

This needs an AArch64InstPrinter change. Sent https://reviews.llvm.org/D93241

adr may need a similar change as well.

On Mon, Dec 14, 2020 at 12:53 AM James Henderson
<jh7370.2008 at my.bristol.ac.uk> wrote:
>
> Hi,
>
> I thought this was something that somebody had looked at a while back, but I can't immediately find it. I've explicitly CC'ed Fangrui Song, who has made a number of disassembly improvements in the past year. He may be able to help.
>
> James
>
> On Sat, 12 Dec 2020 at 08:57, Haishan via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>>
>>
>> I used llvm-objdump to dump aarch64 binary, but it prints relative address of .rodata section in adrp instruction.
>>
>> Like:
>>
>>   llvm-objdump
>>
>>   400848: 02 00 00 90   adrp    x2, #0x0
>>
>>   40084c: 42 60 29 91   add x2, x2, #0xa58
>>
>>   400850: 44 48 63 38   ldrb    w4, [x2, w3, uxtw]
>>
>>   400854: 65 00 00 10   adr x5, #0xc
>>
>>   400858: a4 88 24 8b   add x4, x5, w4, sxtb #2
>>
>>   40085c: 80 00 1f d6   br  x4
>>
>> Moreover, when debug llvm-objdump binary, this adrp MCInst express by MCExpr which Kind is MCExpr::Target, not immediate.
>>
>>
>>
>> But I used objdump tools of binutils, it prints absolute address. Such as:
>>
>>   400848:       90000002        adrp    x2, 400000 <_init-0x518>
>>
>>   40084c:       91296042        add     x2, x2, #0xa58
>>
>>   400850:       38634844        ldrb    w4, [x2,w3,uxtw]
>>
>>   400854:       10000065        adr     x5, 400860 <local+0x48>
>>
>>   400858:       8b2488a4        add     x4, x5, w4, sxtb #2
>>
>>   40085c:       d61f0080        br      x4
>>
>> So How to get absolute address with llvm MCInst?
>>
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