[Bug gas/25406] New: [ARM] pcrel relocations referencing STB_GLOBAL symbols are resolved at assembly time

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=25406

            Bug ID: 25406
           Summary: [ARM] pcrel relocations referencing STB_GLOBAL symbols
                    are resolved at assembly time
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: i at maskray dot me
  Target Milestone: ---

% cat pcrel-global.s
.syntax unified

.globl foo
foo:
ldrd r0, r1, foo @ arm_pcrel_10_unscaled
vldr d0, foo     @ arm_pcrel_10
adr r2, foo      @ arm_adr_pcrel_12
ldr r0, foo      @ arm_ldst_pcrel_12

.thumb
.thumb_func

.globl bar
bar:
adr r0, bar      @ thumb_adr_pcrel_10
adr.w r0, bar    @ t2_adr_pcrel_12
ldr.w pc, bar    @ t2_ldst_pcrel_12

% arm-linux-gnueabi-as -mfpu=vfp pcrel-global.s -o /tmp/c/a.o
% readelf -r /tmp/c/a.o

There are no relocations in this file.


If the definitions of foo and bar are deleted, each instruction can issue an
error.



STB_GLOBAL STV_DEFAULT symbols can be preemptible (if in a shared object).
Should relocations be emitted? On many other architectures, relocations will be
emitted.

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