https://sourceware.org/bugzilla/show_bug.cgi?id=21516
Bug ID: 21516
Summary: PPC VLE linker produces broken object
Product: binutils
Version: 2.25
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: alfedotov at gmail dot com
Target Milestone: ---
Created attachment 10067
--> https://sourceware.org/bugzilla/attachment.cgi?id=10067&action=edit
reproducible test case
Hi
It seems since from 2.25 version linker does something with VLE relocations
wrong. Issue not present on 2.24.90.
Running LD with certain command line and disassemble resulting ELF gives:
02000000 <__init>:
2000000: 18 21 06 f0 e_stwu r1,-16(r1)
2000004: 00 80 se_mflr r0
2000006: 54 01 00 14 e_stw r0,20(r1)
200000a: 00 00 se_illegal
200000c: 50 01 00 14 e_lwz r0,20(r1)
2000010: 00 90 se_mtlr r0
2000012: 20 f1 se_addi r1,16
2000014: 00 04 se_blr
2000016: 50 01 81 00 e_lwz r0,0(r1)
se_illegal instruction appears in ELF multiple times and breaks runtime
execution.
Tracked down differences 2.24.90 vs 2.25 I found that check "branch in range"
at ppc_elf_relax_section() somehow affects final result. E.g. 2.24.90 produces
warning on output:
test.o: In function `main':
test.c:(.text+0x10): relocation truncated to fit: R_PPC_VLE_REL24 against
symbol `foo' defined in .ram_code section in test.o
while 2.25 is not.
Attached ld_se_illegal.tar which contains objects and linker script.
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