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[nrf fromlist] debug: mipi_stp_decoder: Avoid potential 64bit unalign… #2049

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Oct 16, 2024
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[nrf fromlist] debug: mipi_stp_decoder: Avoid potential 64bit unalign… #2049

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35 changes: 20 additions & 15 deletions subsys/debug/mipi_stp_decoder.c
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Original file line number Diff line number Diff line change
Expand Up @@ -461,36 +461,41 @@ static inline void get_nibbles64(const uint8_t *src, size_t src_noff, uint8_t *d
{
bool src_ba = (src_noff & 0x1UL) == 0;
bool dst_ba = (dst_noff & 0x1UL) == 0;
uint64_t *src64 = (uint64_t *)&src[src_noff / 2];
uint64_t *dst64 = (uint64_t *)&dst[dst_noff / 2];
uint32_t *src32 = (uint32_t *)&src[src_noff / 2];
uint32_t *dst32 = (uint32_t *)&dst[dst_noff / 2];

if (nlen == 16) {
/* dst must be aligned. */
if (src_ba) {
uint32_t *s32 = (uint32_t *)src64;
uint32_t *d32 = (uint32_t *)dst64;

d32[0] = s32[0];
d32[1] = s32[1];
dst32[0] = src32[0];
dst32[1] = src32[1];
} else {
uint64_t part_a = src64[0] >> 4;
uint64_t part_b = src64[1] << 60;

dst64[0] = part_a | part_b;
uint64_t src0 = src32[0] | ((uint64_t)src32[1] << 32);
uint64_t src1 = src32[2] | ((uint64_t)src32[3] << 32);
uint64_t part_a = src0 >> 4;
uint64_t part_b = src1 << 60;
uint64_t out = part_a | part_b;

dst32[0] = (uint32_t)out;
dst32[1] = (uint32_t)(out >> 32);
}
return;
}

uint64_t src0 = src32[0] | ((uint64_t)src32[1] << 32);
uint64_t mask = BIT64_MASK(nlen * 4) << (src_ba ? 0 : 4);
uint64_t src_d = src64[0] & mask;
uint64_t src_d = src0 & mask;

if (((src_noff ^ dst_noff) & 0x1UL) == 0) {
dst64[0] |= src_d;
/* nothing */
} else if (dst_ba) {
dst64[0] |= (src_d >> 4);
src_d >>= 4;
} else {
dst64[0] |= (src_d << 4);
src_d <<= 4;
}

dst32[0] |= (uint32_t)src_d;
dst32[1] |= (uint32_t)(src_d >> 32);
}

/* Function performs getting nibbles in less efficient way but does not use unaligned
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