Commit 2b02ed55 authored by Josh Poimboeuf's avatar Josh Poimboeuf
Browse files

x86/crypto/crc32c-pcl-intel: Standardize jump table 



Simplify the jump table code so that it resembles a compiler-generated
table.

This enables ORC unwinding by allowing objtool to follow all the
potential code paths.

Signed-off-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
Tested-by: default avatarArd Biesheuvel <ardb@kernel.org>
Acked-by: default avatarArd Biesheuvel <ardb@kernel.org>
Tested-by: default avatarSami Tolvanen <samitolvanen@google.com>
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Link: https://lore.kernel.org/r/5357a039def90b8ef6b5874ef12cda008ecf18ba.1614182415.git.jpoimboe@redhat.com
parent dabe5167

arch/x86/crypto/crc32c-pcl-intel-asm_64.S

+2 −5
Original line number Diff line number Diff line
@@ -53,7 +53,7 @@ 
.endm



.macro JMPTBL_ENTRY i

.word crc_\i - crc_array

.quad crc_\i

.endm



.macro JNC_LESS_THAN j
@@ -168,10 +168,7 @@ continue_block: 
	xor     crc2, crc2



	## branch into array

	lea	jump_table(%rip), %bufp

	movzwq  (%bufp, %rax, 2), len

	lea	crc_array(%rip), %bufp

	lea     (%bufp, len, 1), %bufp

	mov	jump_table(,%rax,8), %bufp

	JMP_NOSPEC bufp



	################################################################