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| author | Jens Remus <jremus@linux.ibm.com> | 2024-07-12 16:53:47 +0200 |
|---|---|---|
| committer | Jens Remus <jremus@linux.ibm.com> | 2024-07-12 16:53:47 +0200 |
| commit | 6f8b365b653dc9a7370b3bb906a945b5bf5f867c (patch) | |
| tree | b4b64b1751dbe4e3b61ed9d9fc1197821f8b799e /ld | |
| parent | 83511d2679bbcc4b8d6ac42fb71cfbc35e77107e (diff) | |
| download | gdb-6f8b365b653dc9a7370b3bb906a945b5bf5f867c.zip gdb-6f8b365b653dc9a7370b3bb906a945b5bf5f867c.tar.gz gdb-6f8b365b653dc9a7370b3bb906a945b5bf5f867c.tar.bz2 | |
s390: Avoid reloc overflows on undefined weak symbols (cont)
This complements and reuses logic from Andreas Krebbel's commit
896a639babe2 ("s390: Avoid reloc overflows on undefined weak symbols").
Replace relative long addressing instructions of weak symbols, which
will definitely resolve to zero, with either a load address of 0 or a
a trapping insn.
This prevents the PLT32DBL relocation from overflowing in case the
binary will be loaded at 4GB or more.
bfd/
* elf64-s390.c (elf_s390_relocate_section): Replace
instructions using undefined weak symbols with relative
addressing to avoid relocation overflows.
ld/
* testsuite/ld-s390/s390.exp: Add new test.
* testsuite/ld-s390/weakundef-2.s: New test.
* testsuite/ld-s390/weakundef-2.dd: Likewise.
Reported-by: Alexander Gordeev <agordeev@linux.ibm.com>
Suggested-by: Ilya Leoshkevich <iii@linux.ibm.com>
Suggested-by: Andreas Krebbel <krebbel@linux.ibm.com>
Signed-off-by: Jens Remus <jremus@linux.ibm.com>
Diffstat (limited to 'ld')
| -rw-r--r-- | ld/testsuite/ld-s390/s390.exp | 5 | ||||
| -rw-r--r-- | ld/testsuite/ld-s390/weakundef-2.dd | 17 | ||||
| -rw-r--r-- | ld/testsuite/ld-s390/weakundef-2.s | 17 |
3 files changed, 38 insertions, 1 deletions
diff --git a/ld/testsuite/ld-s390/s390.exp b/ld/testsuite/ld-s390/s390.exp index eb9ea35..ac62d7a 100644 --- a/ld/testsuite/ld-s390/s390.exp +++ b/ld/testsuite/ld-s390/s390.exp @@ -95,9 +95,12 @@ set s390xtests { "-m64" {pltoffset-1.s} {{objdump "-dzrj.text --stop-address=16" pltoffset-1.dd}} "pltoffset-1"} - {"WEAKUNDEF1: overflow test" + {"WEAKUNDEF1: overflow test (PC32DBL)" "-m elf64_s390 -dT 8GB.ld --no-error-rwx-segments" "" "-m64" {weakundef-1.s} {{objdump "-dzrj.text" weakundef-1.dd}} "weakundef-1"} + {"WEAKUNDEF2: overflow test (PLT32DBL)" + "-m elf64_s390 -dT 8GB.ld --no-error-rwx-segments -no-pie" "" "-m64" {weakundef-2.s} + {{objdump "-dzrj.text" weakundef-2.dd}} "weakundef-2"} } if [istarget "s390-*-*"] { diff --git a/ld/testsuite/ld-s390/weakundef-2.dd b/ld/testsuite/ld-s390/weakundef-2.dd new file mode 100644 index 0000000..e7f0e22 --- /dev/null +++ b/ld/testsuite/ld-s390/weakundef-2.dd @@ -0,0 +1,17 @@ +tmpdir/weakundef-2: file format elf64-s390 + +Disassembly of section .text: + +0+200000000 <foo>: +.*: c0 10 00 00 00 12 [ ]*larl %r1,200000024 <d> +.*: c0 10 00 00 00 10 [ ]*larl %r1,200000026 <wd> +.*: e3 10 00 00 00 71 [ ]*lay %r1,0 +.*: c0 e5 00 00 00 09 [ ]*brasl %r14,200000024 <d> +.*: c0 e5 00 00 00 07 [ ]*brasl %r14,200000026 <wd> +.*: c0 f4 00 00 00 01 [ ]*jg .* + +0+200000024 <d>: +.*: 07 fe [ ]*br %r14 + +0+200000026 <wd>: +.*: 07 fe [ ]*br %r14 diff --git a/ld/testsuite/ld-s390/weakundef-2.s b/ld/testsuite/ld-s390/weakundef-2.s new file mode 100644 index 0000000..d147b53 --- /dev/null +++ b/ld/testsuite/ld-s390/weakundef-2.s @@ -0,0 +1,17 @@ +.text + .globl foo +foo: + larl %r1,d@PLT + larl %r1,wd@PLT + larl %r1,wu@PLT + brasl %r14,d@PLT + brasl %r14,wd@PLT + brasl %r14,wu@PLT + .weak wu + .type d,@function +d: + br %r14 + .weak wd + .type wd,@function +wd: + br %r14 |