[Bug ld/25500] New: [powerpc] R_PPC_REL16_LO/R_PPC64_REL16_LO referencing a preemptible symbol should be rejected

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=25500

            Bug ID: 25500
           Summary: [powerpc] R_PPC_REL16_LO/R_PPC64_REL16_LO referencing
                    a preemptible symbol should be rejected
           Product: binutils
           Version: 2.35 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: i at maskray dot me
  Target Milestone: ---

x86-64 (and many other archs)
cat > b.s <<e
.byte 0xe8
.long foo - . - 4

.section .text.foo,"ax",@progbits
.globl foo
foo:
e

as b.s -o b.o
ld.bfd b.o -shared # relocation R_X86_64_PC32 against symbol `foo' can not be
used when making a shared object;  recompile with -fPIC


powerpc32/powerpc64
cat > a.s <<e
bcl 20,31,.+4
mflr 9
addi 9,9, (__kernel_datapage_offset - (.-4))@l

.section .text.foo,"ax",@progbits
.globl __kernel_datapage_offset
__kernel_datapage_offset:
e

powerpc-linux-gnu-as a.s -o a.o
powerpc-linux-gnu-ld -shared a.o  # no error
powerpc64le-linux-gnu-as a.s -o a.o
powerpc64le-linux-gnu-ld -shared a.o  # no error


This is incorrect. STB_DEFAULT STV_DEFAULT __kernel_datapage_offset is
preemptible in a shared object. If __kernel_datapage_offset binds to another
component at runtime, the patched instruction will be wrong.

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