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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