https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95285
--- Comment #11 from Bu Le <bule1 at huawei dot com> --- > You're right, we need an extra add, so it's like this: > > adrp x0, bar1.2782 > movk x1, :high32_47:bar1.2782 > add x0, x0, x1 > add x0, x0, :lo12:bar1.2782 > > > (By the way, the high32_47 relocation you suggested is the prel_g2 in the > > officail aarch64 ABI released) > > It needs a new relocation because of the ADRP. ADR could be used so the > existing R_<CLS>_MOVW_PREL_G0-3 work, but then you need 5 instructions. So you suggest a new relocation type "high32_47" to calculate the offset between ADRP and bar1. Am I right? > > And in terms of engineering, you idea can save the trouble to modify the > > linker for calculating the offset for 3 movks. But we still need to make a > > new relocation type for ADRP, because it currently checking the overflow of > > address and gives the "relocation truncated to fit" error. Therefore, both > > idea need to do works in binutils, which make it also equivalent. > > There is relocation 276 (R_<CLS>_ADR_PREL_PG_HI21_NC). Yes, through, we still need to make a change to compiler so when it comes to medium code model, ADRP can use R_<CLS>_ADR_PREL_PG_HI21_NC relocation.
