https://sourceware.org/bugzilla/show_bug.cgi?id=28735
Bug ID: 28735
Summary: relocation truncated to fit: R_OR1K_GOT16 on OpenRISC,
building libgeos
Product: binutils
Version: 2.37
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: shorne at sourceware dot org
Target Milestone: ---
This is related to 21464, the original fix was not sufficient.
Creating this binutils filing as a copy of the gcc bug:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99783
>From that bug:
OK, I can reproduce, but I am not sure what is going on I will need to debug a
bit more. This is what I have so far.
ERROR:
I am seeing the same error you report.
buildroot/output/host/lib/gcc/or1k-buildroot-linux-uclibc/11.2.0/crtbeginS.o:
in function `deregister_tm_clones':
crtstuff.c:(.text+0x44): relocation truncated to fit: R_OR1K_GOT16 against
undefined symbol `_ITM_deregisterTMCloneTable'
buildroot/output/host/lib/gcc/or1k-buildroot-linux-uclibc/11.2.0/crtbeginS.o:
in function `register_tm_clones':
crtstuff.c:(.text+0xcc): relocation truncated to fit: R_OR1K_GOT16 against
undefined symbol `_ITM_registerTMCloneTable'
buildroot/output/host/lib/gcc/or1k-buildroot-linux-uclibc/11.2.0/crtbeginS.o:
in function `__do_global_dtors_aux':
crtstuff.c:(.text+0x12c): relocation truncated to fit: R_OR1K_GOT16 against
symbol `__cxa_finalize' defined in .text section in
buildroot/output/host/or1k-buildroot-linux-uclibc/sysroot/lib/libc.so.1
crtstuff.c:(.text+0x15c): relocation truncated to fit: R_OR1K_GOT16 against
symbol `__deregister_frame_info@@GLIBC_2.0' defined in .text section in
buildroot/output/host/lib/gcc/or1k-buildroot-linux-uclibc/11.2.0/../../../../or1k-buildroot-linux-uclibc/lib/libgcc_s.so
buildroot/output/host/lib/gcc/or1k-buildroot-linux-uclibc/11.2.0/crtbeginS.o:
in function `frame_dummy':
Actual Code patterns:
Looking at the generated object file.
We can see R_OR1K_GOT_AHI16 followed by R_OR1K_GOT16. This confirms the
cmodel=large is ON.
or1k-elf-objdump -dr
buildroot/output/host/lib/gcc/or1k-buildroot-linux-uclibc/11.2.0/crtbeginS.o
deregister_tm_clones:
38: 1a 20 00 00 l.movhi r17,0x0
38: R_OR1K_GOT_AHI16 _ITM_deregisterTMCloneTable
3c: e2 31 98 00 l.add r17,r17,r19
40: 1a 60 00 00 l.movhi r19,0x0
44: 86 31 00 00 l.lwz r17,0(r17)
44: R_OR1K_GOT16 _ITM_deregisterTMCloneTable
48: e4 11 98 00 l.sfeq r17,r19
4c: 10 00 00 04 l.bf 5c <deregister_tm_clones+0x5c>
50: 85 21 00 00 l.lwz r9,0(r1)
register_tm_clones:
c0: 10 00 00 09 l.bf e4 <register_tm_clones+0x7c>
c4: 1a 20 00 00 l.movhi r17,0x0
c4: R_OR1K_GOT_AHI16 _ITM_registerTMCloneTable
c8: e2 31 98 00 l.add r17,r17,r19
cc: 86 31 00 00 l.lwz r17,0(r17)
cc: R_OR1K_GOT16 _ITM_registerTMCloneTable
d0: e4 11 a8 00 l.sfeq r17,r21
__do_global_dtors_aux:
150: 1a 20 00 00 l.movhi r17,0x0
150: R_OR1K_GOT_AHI16 __deregister_frame_info
154: e2 31 80 00 l.add r17,r17,r16
158: 1a 60 00 00 l.movhi r19,0x0
15c: 86 31 00 00 l.lwz r17,0(r17)
15c: R_OR1K_GOT16 __deregister_frame_info
160: e4 11 98 00 l.sfeq r17,r19
164: 10 00 00 07 l.bf 180 <__do_global_dtors_aux+0x90>
IN buildroot/output/build/host-binutils-2.37/bfd/elf32-or1k.c:
We have this bit of code which confirms we have the correct patches
available in binutils. This code shows we should be avoiding this
truncation
if we have R_OR1K_GOT_AHI16 followed by R_OR1K_GOT16 which is what we have.
Note, the comment above if (r_type == R_OR1K_GOT16 && saw_gotha) seems
backwards.
if (r_type == R_OR1K_GOT_AHI16)
saw_gotha = true;
/* If we have a R_OR1K_GOT16 followed by a R_OR1K_GOT_AHI16
relocation we assume the code is doing the right thing to avoid
overflows. Here we mask the lower 16-bit of the relocation to
avoid overflow validation failures. */
if (r_type == R_OR1K_GOT16 && saw_gotha)
relocation &= 0xffff;
I will have to look at this more.
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