https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71951
--- Comment #7 from Timo Teräs <timo.teras at iki dot fi> --- (In reply to Andrew Pinski from comment #6) > (In reply to Timo Teräs from comment #5) > > Not easily. It's musl, and using iterate phdr. Same build script works on > > x86, x86_64 and armhf. It's only aarch64 misbehaving like this with omit > > frame pointer. Any other suggestions what to try/how to debug further? > > So check the unwind information to see if it is correct. > > > 0x000003ffb7db974c <+20>: sxtw x1, w1 > 0x000003ffb7db9750 <+24>: ldr x2, [x0,x1,lsl #3] > > So x0 + ((long long)(int)w1) << 3 > Or rather contex + index > > And it is looking into x29 because of x1 is 29. > > So it does look like the unwind information is messed up for the frame being > looked at. I'm not too familiar with dwarf, but I assume the section relevant from objdump --dwarf output is: 00000120 000000000000001c 00000124 FDE cie=00000000 pc=0000000000009738..0000000000009788 DW_CFA_advance_loc: 12 to 0000000000009744 DW_CFA_def_cfa_offset: 16 DW_CFA_offset: r30 (x30) at cfa-16 DW_CFA_advance_loc: 4 to 0000000000009748 DW_CFA_def_cfa_offset: 0 DW_CFA_restore: r30 (x30) DW_CFA_nop DW_CFA_nop DW_CFA_nop DW_CFA_nop DW_CFA_nop DW_CFA_nop I can also attach the broken libgcc_s here if it helps.
