Messages in this thread | | | Subject | Re: [PATCH v1 5/6] objtool: Add skipped member in struct reloc | From | Xi Ruoyao <> | Date | Wed, 09 Aug 2023 19:58:20 +0800 |
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On Wed, 2023-08-09 at 19:51 +0800, Xi Ruoyao wrote: > On Thu, 2023-08-03 at 14:11 +0200, Peter Zijlstra wrote: > > On Thu, Aug 03, 2023 at 07:36:24PM +0800, Tiezhu Yang wrote: > > > > > > ".long " __stringify_label(c) "b - .\n\t" \ > > > > > I discussed offline with the engineers who are familiar with gnu > > > assembler of LoongArch, maybe it can modify the gnu assembler > > > to use R_LARCH_32_PCREL to replace a pair of R_LARCH_ADD32 and > > > R_LARCH_SUB32, then I will test it again and drop this change if > > > possible. > > Hmm, but I don't like the idea to disallow users having GAS <= 2.41 from > using ORC unwinder. > > Can we emit the R_LARCH_32_PCREL reloc with an explicit .reloc > directive?
Answering myself: "maybe", I've written a simple PoC:
$ cat t.s .global main main: la.pcrel $t0, f ld.w $t1, $t0, 0 ldx.d $a0, $t1, $t0 jr $ra
t: .dword 42 .zero 64
f: .reloc f, R_LARCH_32_PCREL, t .word 0 $ ./a.out $ echo $? 42 -- Xi Ruoyao <xry111@xry111.site> School of Aerospace Science and Technology, Xidian University
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