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For x32, we must encode "lea x@TLSDESC(%rip), %reg" with a REX prefix
even if it isn't required. Otherwise linker can’t safely perform
GDesc -> IE/LE optimization. X32 TLSDESC sequences can be:
40 8d 05 00 00 00 00 rex lea x@TLSDESC(%rip), %reg
...
67 ff 10 call *x@TLSCALL(%eax)
or the same sequence as LP64:
48 8d 05 00 00 00 00 lea foo@TLSDESC(%rip), %reg
...
ff 10 call *foo@TLSCALL(%rax)
We need to support both sequences for x32. For both GDesc -> IE/LE
transitions,
67 ff 10 call *x@TLSCALL(%eax)
should relaxed to
0f 1f 00 nopl (%rax)
For GDesc -> LE transition,
40 8d 05 00 00 00 00 rex lea x@TLSDESC(%rip), %reg
should relaxed to
40 c7 c0 fc ff ff ff rex movl $x@tpoff, %reg
For GDesc -> IE transition,
40 8d 05 00 00 00 00 rex lea x@TLSDESC(%rip), %reg
should relaxed to
40 8b 05 00 00 00 00 rex movl x@gottpoff(%rip), %eax
bfd/
PR ld/25416
* elf64-x86-64.c (elf_x86_64_check_tls_transition): Support
"rex leal x@tlsdesc(%rip), %reg" and "call *x@tlsdesc(%eax)" in
X32 mode.
(elf_x86_64_relocate_section): In x32 mode, for GDesc -> LE
transition, relax "rex leal x@tlsdesc(%rip), %reg" to
"rex movl $x@tpoff, %reg", for GDesc -> IE transition, relax
"rex leal x@tlsdesc(%rip), %reg" to
"rex movl x@gottpoff(%rip), %eax". For both transitions, relax
"call *(%eax)" to "nopl (%rax)".
gas/
PR ld/25416
* config/tc-i386.c (output_insn): Add a dummy REX_OPCODE prefix
for lea with R_X86_64_GOTPC32_TLSDESC relocation when generating
x32 object.
* testsuite/gas/i386/ilp32/x32-tls.d: Updated.
* testsuite/gas/i386/ilp32/x32-tls.s: Add tests for lea with
R_X86_64_GOTPC32_TLSDESC relocation.
ld/
PR ld/25416
* testsuite/ld-x86-64/pr25416-1.s: New file
* testsuite/ld-x86-64/pr25416-1a.d: Likewise.
* testsuite/ld-x86-64/pr25416-1b.d: Likewise.
* testsuite/ld-x86-64/pr25416-1.s: Likewise.
* testsuite/ld-x86-64/pr25416-2.s: Likewise.
* testsuite/ld-x86-64/pr25416-2a.d: Likewise.
* testsuite/ld-x86-64/pr25416-2b.d: Likewise.
* testsuite/ld-x86-64/pr25416-3.d: Likewise.
* testsuite/ld-x86-64/pr25416-3.s: Likewise.
* testsuite/ld-x86-64/pr25416-4.d: Likewise.
* testsuite/ld-x86-64/pr25416-4.s: Likewise.
* testsuite/ld-x86-64/pr25416-5a.c: Likewise.
* testsuite/ld-x86-64/pr25416-5b.s: Likewise.
* testsuite/ld-x86-64/pr25416-5c.s: Likewise.
* testsuite/ld-x86-64/pr25416-5d.s: Likewise.
* testsuite/ld-x86-64/pr25416-5e.s: Likewise.
* testsuite/ld-x86-64/x86-64.exp: Run PR ld/25416 tests.
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