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x86/crypto/crc32c-pcl-intel: Standardize jump table
author
Josh Poimboeuf
<jpoimboe@redhat.com>
Wed, 24 Feb 2021 16:29:19 +0000
(10:29 -0600)
committer
Josh Poimboeuf
<jpoimboe@redhat.com>
Mon, 19 Apr 2021 17:36:34 +0000
(12:36 -0500)
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
arch/x86/crypto/crc32c-pcl-intel-asm_64.S
patch
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diff --git
a/arch/x86/crypto/crc32c-pcl-intel-asm_64.S
b/arch/x86/crypto/crc32c-pcl-intel-asm_64.S
index
884dc76
..
ac1f303
100644
(file)
--- a/
arch/x86/crypto/crc32c-pcl-intel-asm_64.S
+++ b/
arch/x86/crypto/crc32c-pcl-intel-asm_64.S
@@
-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
################################################################