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target-arm: ignore ELR_ELx[1] for exception return to 32-bit ARM mode
The architecture requires that for an exception return to AArch32 the low bits of ELR_ELx are ignored when the PC is set from them: * if returning to Thumb mode, ignore ELR_ELx[0] * if returning to ARM mode, ignore ELR_ELx[1:0] We were only squashing bit 0; also squash bit 1 if the SPSR T bit indicates this is a return to ARM code. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
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