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5bba7aa495
Fix the problem of inaccurate identification of instructions BLEZL and BGTZL in R2 emulation code by making sure all necessary encoding specifications are met. Previously, certain R6 instructions could be identified as BLEZL or BGTZL. R2 emulation routine didn't take into account that both BLEZL and BGTZL instructions require their rt field (bits 20 to 16 of instruction encoding) to be 0, and that, at same time, if the value in that field is not 0, the encoding may represent a legitimate MIPS R6 instruction. This means that a problem could occur after emulation optimization, when emulation routine tried to pipeline emulation, picked up a next candidate, and subsequently misrecognized an R6 instruction as BLEZL or BGTZL. It should be said that for single pass strategy, the problem does not happen because CPU doesn't trap on branch-compacts which share opcode space with BLEZL/BGTZL (but have rt field != 0, of course). Signed-off-by: Leonid Yegoshin <leonid.yegoshin@imgtec.com> Signed-off-by: Miodrag Dinic <miodrag.dinic@imgtech.com> Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtech.com> Reported-by: Douglas Leung <douglas.leung@imgtec.com> Reviewed-by: Paul Burton <paul.burton@imgtec.com> Cc: james.hogan@imgtec.com Cc: petar.jovanovic@imgtec.com Cc: goran.ferenc@imgtec.com Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/15456/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org> |
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