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bn_mul.h: require at least ARMv6 to enable the ARM DSP code

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Commit 16b1bd8932 "bn_mul.h: add ARM DSP optimized MULADDC code"
added some ARM DSP instructions that was assumed to always be available
when __ARM_FEATURE_DSP is defined to 1. Unfortunately it appears that
the ARMv5TE architecture (GCC flag -march=armv5te) supports the DSP
instructions, but only in Thumb mode and not in ARM mode, despite
defining __ARM_FEATURE_DSP in both cases.

This patch fixes the build issue by requiring at least ARMv6 in addition
to the DSP feature.
This commit is contained in:
Aurelien Jarno 2018-11-03 00:46:06 +01:00 committed by Gilles Peskine
parent a60dc25e9f
commit a6901796f6
1 changed files with 2 additions and 1 deletions
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3
include/mbedtls/bn_mul.h
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@ -642,7 +642,8 @@
"r6", "r7", "r8", "r9", "cc" \
);
#elif defined (__ARM_FEATURE_DSP) && (__ARM_FEATURE_DSP == 1)
#elif (__ARM_ARCH >= 6) && \
defined (__ARM_FEATURE_DSP) && (__ARM_FEATURE_DSP == 1)
#define MULADDC_INIT \
asm(