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Mark clobbered registers as clobbered in GCM mode (GH #1133)

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This resolves failing AES-GCM tests on amd64 with GCC 11 on Linux
with SSE2 on and other CPU features off.

While here, remove unused r11 and clobber ebx unconditionally.

Co-authored-by: v1ne <v1ne2go@gmail.com>
This commit is contained in:
v1ne 2022-07-29 10:24:02 +02:00 committed by GitHub
parent 9ea66ce4d9
commit e59577b49e
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 6 additions and 5 deletions
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11
gcm.cpp
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@ -559,6 +559,9 @@ size_t GCM_Base::AuthenticateBlocks(const byte *data, size_t len)
#endif
#if CRYPTOPP_SSE2_ASM_AVAILABLE
#define PERCENT_REG_(x) "%" #x
#define PERCENT_REG(x) PERCENT_REG_(x)
case 1: // SSE2 and 2K tables
{
#ifdef __GNUC__
@ -725,10 +728,8 @@ size_t GCM_Base::AuthenticateBlocks(const byte *data, size_t len)
ATT_PREFIX
:
: "c" (data), "d" (len/16), "S" (hashBuffer), "D" (s_reductionTable)
: "memory", "cc", "%eax"
#if CRYPTOPP_BOOL_X64
, "%ebx", "%r11"
#endif
: "memory", "cc", "%eax", "%ebx", PERCENT_REG(AS_REG_7), "%xmm0",
"%xmm1", "%xmm2", "%xmm3", "%xmm4", "%xmm5"
);
#elif defined(CRYPTOPP_GENERATE_X64_MASM)
pop rbx
@ -804,7 +805,7 @@ size_t GCM_Base::AuthenticateBlocks(const byte *data, size_t len)
ATT_PREFIX
:
: "c" (data), "d" (len/16), "S" (hashBuffer)
: "memory", "cc", "%edi", "%eax"
: "memory", "cc", "%edi", "%eax", "%xmm0", "%xmm1"
);
#elif defined(CRYPTOPP_GENERATE_X64_MASM)
pop rdi