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Gold: Handle R_X86_64_CODE_4_GOTPC32_TLSDESC/R_X86_64_CODE_4_GOTTPOFF

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Handle R_X86_64_CODE_4_GOTTPOFF and R_X86_64_CODE_4_GOTPC32_TLSDESC.
Convert

	add	name@gottpoff(%rip), %reg
	mov	name@gottpoff(%rip), %reg

to

	add	$name@tpoff, %reg
	mov	$name@tpoff, %reg

and

	lea	name@tlsdesc(%rip), %reg

to

	mov     $name@tpoff, %reg
	mov	name@gottpoff(%rip), %reg

if the instruction is encoded with the REX2 prefix when possible.

elfcpp/

	* x86_64.h (R_X86_64_CODE_4_GOTTPOFF): New.
	(R_X86_64_CODE_4_GOTPC32_TLSDESC): Likewise.

gold/

	* x86_64.cc (Target_x86_64::optimize_tls_reloc): Handle
	R_X86_64_CODE_4_GOTPC32_TLSDESC and R_X86_64_CODE_4_GOTTPOFF.
	(Target_x86_64::Scan::get_reference_flags): Likewise.
	(Target_x86_64::Scan::local): Likewise.
	(Target_x86_64::Scan::global): Likewise.
	(Target_x86_64::Relocate::relocate): Likewise.
	(Target_x86_64::Relocate::relocate_tls): Likewise.
	(Target_x86_64::Relocate::tls_desc_gd_to_ie): Handle
	R_X86_64_CODE_4_GOTPC32_TLSDESC.
	(Target_x86_64::Relocate::tls_desc_gd_to_le): Likewise.
	(Target_x86_64::Relocate::tls_ie_to_le): Handle.
	R_X86_64_CODE_4_GOTTPOFF.
	* testsuite/Makefile.am: Add x86_64_ie_to_le test.
	* testsuite/Makefile.in: Regenerated.
	* testsuite/x86_64_gd_to_le.s: Add R_X86_64_CODE_4_GOTPC32_TLSDESC
	test.
	* testsuite/x86_64_gd_to_le.sh: Check GDesc to LE conversion.
	* testsuite/x86_64_ie_to_le.s: New file.
	* testsuite/x86_64_ie_to_le.sh: Likewise.
This commit is contained in:
H.J. Lu
2023-07-02 07:46:21 -07:00
parent a533c8df59
commit 00a17c6ad0
8 changed files with 203 additions and 37 deletions
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8
elfcpp/x86_64.h
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@@ -102,6 +102,14 @@ enum
// GOT if the instruction starts at 4
// bytes before the relocation offset,
// relaxable.
R_X86_64_CODE_4_GOTTPOFF = 44, // 32 bit signed PC relative offset to
// GOT entry for IE symbol if the
// instruction starts at 4 bytes before
// the relocation offset.
R_X86_64_CODE_4_GOTPC32_TLSDESC = 45, // 32-bit PC relative to TLS
// descriptor in GOT if the
// instruction starts at 4 bytes
// before the relocation offset.
// GNU vtable garbage collection extensions.
R_X86_64_GNU_VTINHERIT = 250,
R_X86_64_GNU_VTENTRY = 251