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Add ebx to the i386 clobber list for MPI assembly

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This fix adds the ebx register to the clobber list for the i386 inline assembly
for the multiply helper function.

ebx was used but not listed, so when the compiler chose to also use it, ebx was
getting corrupted. I'm surprised this wasn't spotted sooner.

Fixes Github issues #1550.
This commit is contained in:
Simon Butcher 2018-06-24 12:58:31 +01:00
parent 41c23b5a49
commit 83868a0e45
1 changed files with 2 additions and 2 deletions
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4
include/mbedtls/bn_mul.h
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@ -142,7 +142,7 @@
"movl %%esi, %3 \n\t" \
: "=m" (t), "=m" (c), "=m" (d), "=m" (s) \
: "m" (t), "m" (s), "m" (d), "m" (c), "m" (b) \
: "eax", "ecx", "edx", "esi", "edi" \
: "eax", "ebx", "ecx", "edx", "esi", "edi" \
);
#else
@ -154,7 +154,7 @@
"movl %%esi, %3 \n\t" \
: "=m" (t), "=m" (c), "=m" (d), "=m" (s) \
: "m" (t), "m" (s), "m" (d), "m" (c), "m" (b) \
: "eax", "ecx", "edx", "esi", "edi" \
: "eax", "ebx", "ecx", "edx", "esi", "edi" \
);
#endif /* SSE2 */
#endif /* i386 */