[Bug ld/18668] New: relocation truncated to fit: R_AARCH64_CALL26 (veneers not inserted)

[david.abdurachmanov at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18668

            Bug ID: 18668
           Summary: relocation truncated to fit: R_AARCH64_CALL26 (veneers
                    not inserted)
           Product: binutils
           Version: 2.26 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: david.abdurachmanov at gmail dot com
  Target Milestone: ---

The issues was discovered in OpenLoops package, also this was raised on the
internet earlier. IIUC, this works fine if ARM linker is used.

OpenLoops generates DSO of ~150MB and -/+ 128 MB are not enough for direct
calls. ld.bfd does not insert veneers in these cases.

A smallest reproducer was posted on LLVM mailing-list:

    void  foo ();
    int main () {foo();}

$ gcc -Wl,--defsym=foo=0x80000000 -o main main.c
/tmp/cc0zWsNY.o: In function `main':
main.c:(.text+0x8): relocation truncated to fit: R_AARCH64_CALL26 against
symbol `foo' defined in *ABS* section in main
collect2: error: ld returned 1 exit status

Note, that this works fine on ARMv7/AArch32 and veneer is inserted. Tested on
Jetson TK1 + binutils 2.24 + GCC 4.8.

Looking at AArch64 backend in aarch64_type_of_stub there is a check:

2287   if ((r_type == AARCH64_R (CALL26) || r_type == AARCH64_R (JUMP26))
2288       && (branch_offset > AARCH64_MAX_FWD_BRANCH_OFFSET
2289           || branch_offset < AARCH64_MAX_BWD_BRANCH_OFFSET))
2290     {
2291       stub_type = aarch64_stub_long_branch;
2292     }

I guess, the mechanism for adding stub/veneer exist, but it's somehow it's not
applied here.

Binutils commit: d5131498a57d1789ff0fea2cfeb1af90802c8dad (Mon Jul 13 17:14:13
2015 +0100)

### OpenLoops failures ###

process_obj/pplljjj/virtual_6_pplljjj_eexuuxggg_1_qp.os: In function
`__ol_vamp_6_pplljjj_eexuuxggg_1_qp_MOD_vamp_6':
virtual_6_pplljjj_eexuuxggg_1_qp.f90:(.text+0x22820): relocation truncated to
fit: R_AARCH64_CALL26 against symbol `__ol_last_step_qp_MOD_check_last_aq_v'
defined in .text section i
n lib/libopenloops.so
virtual_6_pplljjj_eexuuxggg_1_qp.f90:(.text+0x22f94): relocation truncated to
fit: R_AARCH64_CALL26 against symbol `__ol_last_step_qp_MOD_check_last_aq_v'
defined in .text section i
n lib/libopenloops.so
virtual_6_pplljjj_eexuuxggg_1_qp.f90:(.text+0x23228): relocation truncated to
fit: R_AARCH64_CALL26 against symbol `__ol_vert_interface_qp_MOD_loop_av_q'
defined in .text section in
lib/libopenloops.so
virtual_6_pplljjj_eexuuxggg_1_qp.f90:(.text+0x234d0): relocation truncated to
fit: R_AARCH64_CALL26 against symbol `__ol_prop_interface_qp_MOD_loop_a_q'
defined in .text section in
lib/libopenloops.so
virtual_6_pplljjj_eexuuxggg_1_qp.f90:(.text+0x23764): relocation truncated to
fit: R_AARCH64_CALL26 against symbol `__ol_vert_interface_qp_MOD_loop_av_q'
defined in .text section in
lib/libopenloops.so
virtual_6_pplljjj_eexuuxggg_1_qp.f90:(.text+0x23a0c): relocation truncated to
fit: R_AARCH64_CALL26 against symbol `__ol_prop_interface_qp_MOD_loop_a_q'
defined in .text section in
lib/libopenloops.so
virtual_6_pplljjj_eexuuxggg_1_qp.f90:(.text+0x23c34): relocation truncated to
fit: R_AARCH64_CALL26 against symbol `__ol_last_step_qp_MOD_check_last_aq_v'
defined in .text section i
n lib/libopenloops.so
virtual_6_pplljjj_eexuuxggg_1_qp.f90:(.text+0x24180): relocation truncated to
fit: R_AARCH64_CALL26 against symbol `__ol_prop_interface_qp_MOD_loop_a_q'
defined in .text section in
lib/libopenloops.so
virtual_6_pplljjj_eexuuxggg_1_qp.f90:(.text+0x24414): relocation truncated to
fit: R_AARCH64_CALL26 against symbol `__ol_vert_interface_qp_MOD_loop_av_q'
defined in .text section in
lib/libopenloops.so
virtual_6_pplljjj_eexuuxggg_1_qp.f90:(.text+0x246bc): relocation truncated to
fit: R_AARCH64_CALL26 against symbol `__ol_prop_interface_qp_MOD_loop_a_q'
defined in .text section in
lib/libopenloops.so

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