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bf54968b12
The TLSDESC entry in a lazy procedure linkage table is called indirectly with "callq *(%rax)". This patch adds an ENDBR64 to support indirect branch tracking in Intel CET. The TLSDESC PLT entry now looks like: 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */ 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ 0xff, 0x25, 16, 0, 0, 0 /* jmpq *GOT+TDG(%rip) */ The BND prefix isn't needed since MPX isn't used for TLSDESC. bfd/ PR ld/23000 * elf64-x86-64.c (elf_x86_64_finish_dynamic_sections): Add ENDBR64 to the TLSDESC PLT entry. ld/ PR ld/23000 * testsuite/ld-x86-64/tlsdesc.pd: Updated.
20 lines
689 B
Plaintext
20 lines
689 B
Plaintext
#source: tlsdesc.s
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#source: tlspic2.s
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#as: --64
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#ld: -shared -melf_x86_64 --no-ld-generated-unwind-info
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#objdump: -drj.plt
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#target: x86_64-*-*
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.*: +file format elf64-x86-64
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Disassembly of section .plt:
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[0-9a-f]+ <.plt>:
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[0-9a-f]+: ff 35 .. .. 20 00 pushq .*\(%rip\) # 201358 <_GLOBAL_OFFSET_TABLE_\+0x8>
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[0-9a-f]+: ff 25 .. .. 20 00 jmpq \*.*\(%rip\) # 201360 <_GLOBAL_OFFSET_TABLE_\+0x10>
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[0-9a-f]+: 0f 1f 40 00 nopl 0x0\(%rax\)
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[0-9a-f]+: f3 0f 1e fa endbr64
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[0-9a-f]+: ff 35 .. .. 20 00 pushq .*\(%rip\) # 201358 <_GLOBAL_OFFSET_TABLE_\+0x8>
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[0-9a-f]+: ff 25 .. .. 20 00 jmpq \*.*\(%rip\) # 201348 <.*>
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