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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.
57 lines
935 B
ArmAsm
57 lines
935 B
ArmAsm
.text
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.p2align 4
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.globl test1
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.type test1, @function
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test1:
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.cfi_startproc
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subq $8, %rsp
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.cfi_def_cfa_offset 16
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lea foo@TLSDESC(%rip), %rax
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call *foo@TLSCALL(%rax)
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addl %fs:0, %eax
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cmpl %edi, (%eax)
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jne .L5
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movl %eax, %r8d
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addq $8, %rsp
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.cfi_remember_state
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.cfi_def_cfa_offset 8
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movq %r8, %rax
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ret
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.L5:
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.cfi_restore_state
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call abort@PLT
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.cfi_endproc
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.size test1, .-test1
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.p2align 4
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.globl test2
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.type test2, @function
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test2:
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.cfi_startproc
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subq $8, %rsp
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.cfi_def_cfa_offset 16
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lea bar@TLSDESC(%rip), %rax
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call *bar@TLSCALL(%rax)
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addl %fs:0, %eax
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cmpl %edi, (%eax)
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jne .L9
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movl %eax, %r8d
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addq $8, %rsp
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.cfi_remember_state
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.cfi_def_cfa_offset 8
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movq %r8, %rax
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ret
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.L9:
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.cfi_restore_state
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call abort@PLT
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.cfi_endproc
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.size test2, .-test2
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.section .tdata,"awT",@progbits
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.align 4
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.hidden foo
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.globl foo
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.type foo, @object
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.size foo, 4
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foo:
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.long 30
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.section .note.GNU-stack,"",@progbits
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