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

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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: Josh Poimboeuf <jpoimboe@redhat.com>
Tested-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Sami Tolvanen <samitolvanen@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Link: https://lore.kernel.org/r/5357a039def90b8ef6b5874ef12cda008ecf18ba.1614182415.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf 2021-02-24 10:29:19 -06:00
parent dabe5167a3
commit 2b02ed5548
1 changed files with 2 additions and 5 deletions
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7
arch/x86/crypto/crc32c-pcl-intel-asm_64.S
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@ -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
################################################################