rt==15 is a special case when reading the flags: it means the destination is APSR. This patch avoids rejecting vmrs apsr_nzcv, fpscr as illegal instruction.
Signed-off-by: Christophe Lyon <christophe.l...@linaro.org> --- target/arm/translate-vfp.inc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/target/arm/translate-vfp.inc.c b/target/arm/translate-vfp.inc.c index 9ae980b..82bed5b 100644 --- a/target/arm/translate-vfp.inc.c +++ b/target/arm/translate-vfp.inc.c @@ -705,7 +705,7 @@ static bool trans_VMSR_VMRS(DisasContext *s, arg_VMSR_VMRS *a) * The only M-profile VFP vmrs/vmsr sysreg is FPSCR. * Writes to R15 are UNPREDICTABLE; we choose to undef. */ - if (a->rt == 15 || a->reg != ARM_VFP_FPSCR) { + if (a->rt == 15 && (!a->l || a->reg != ARM_VFP_FPSCR)) { return false; } } -- 2.7.4