I'm cross-compiling the FIPS Module v2.0.2 for a NetBSD/MIPS target. All
seems well except for the following warning when compiling bn-mips.s
(gcc version 4.1.3):
/usr/local/bin/perl ../../util/fipsas.pl <http://fipsas.pl> ../..
bn-mips.s mips64--netbsd-gcc -I.. -I../.. -I../modes -I../asn1 -I../evp
-I../../include -DOPENSSL_FIPSCANISTER -fPIC -DOPENSSL_PIC
-DOPENSSL_THREADS -pthread -D_THREAD_SAFE -D_REENTRANT -DDSO_DLFCN
-DHAVE_DLFCN_H -Wa,--noexecstack -DTERMIOS -O3 -fomit-frame-pointer
-msoft-float -Wall -DOPENSSL_BN_ASM_MONT -DSHA1_ASM -DSHA256_ASM
-DSHA512_ASM -DAES_ASM -c -o bn-mips.o bn-mips.s
bn-mips.s: Assembler messages:
bn-mips.s:585: Warning: Pretending global symbol used as branch target
is local.
The code causing the warning is below:
.align 5
.ent bn_div_3_words_internal
bn_div_3_words_internal:
.set reorder
move $11,$31
bal fips_bn_div_words <-----------
move $31,$11
multu $10,$2
lw $14,-2*4($7)
...
Here is something strange. Compiler is called mips64-*, there is
-DSHA512_ASM, both indicate that we are talking about MIPS64 build
(maybe in N32 ABI context, but MIPS64 nevertheless)... But then how come
it's multu and not dmultu two lines below <-----? We don't have config
line for NetBSD/MIPS, so it must be yours, private one. And provided
above it's likely to be inconsistent. I don't know if it will pass the
test. But even if it will, bn will perform sub-optimally, as dmultu
gives at least 3x improvement over multu.
Is this something I can ignore?
Most likely. "Most likely" means that I can't imagine that it would be a
problem, but can't be sure without hands-on experience. At all
occasions, -Bsymbolic should help to avoid eventual problems.
Is there a compiler option I'm missing that would eliminate the warning?
I can't know. But can you test/verify following? Open
crypto/bn/asm/mips.pl in text editor, locate the line that reads
"bal\tbn_div_words" and replace it bn_div_words with
bn_div_words_internal. I can confirm that it produces correct result (in
supported configs!-), but I can't tell if it fixes the warning.
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