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由 Peter Maydell 提交于
The code which patches x86 jump instructions assumes it can do an unaligned write of a uint32_t. This is actually safe on x86, but it's still undefined behaviour. We have infrastructure for doing efficient unaligned accesses which doesn't engage in undefined behaviour, so use it. This is technically fractionally less efficient, at least with gcc 4.6; instead of one instruction: 7b2: 89 3e mov %edi,(%rsi) we get an extra spurious store to the stack slot: 7b2: 89 7c 24 64 mov %edi,0x64(%rsp) 7b6: 89 3e mov %edi,(%rsi) Reviewed-by: NAlex Bennée <alex.bennee@linaro.org> Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NRichard Henderson <rth@twiddle.net>
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