Message ID | 20250130182309.717346-12-peter.maydell@linaro.org |
---|---|
State | Superseded |
Headers | show |
Series | target/arm: Clean up some corner cases of sysreg traps | expand |
On 30/1/25 19:23, Peter Maydell wrote: > On XScale CPUs, there is no EL2 or AArch64, so no syndrome register. > These traps are just UNDEFs in the traditional AArch32 sense, so > CP_ACCESS_TRAP_UNCATEGORIZED is more accurate than CP_ACCESS_TRAP. > This has no visible behavioural change, because the guest doesn't > have a way to see the syndrome value we generate. > > Signed-off-by: Peter Maydell <peter.maydell@linaro.org> > --- > target/arm/tcg/op_helper.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
On 1/30/25 10:23, Peter Maydell wrote: > On XScale CPUs, there is no EL2 or AArch64, so no syndrome register. > These traps are just UNDEFs in the traditional AArch32 sense, so > CP_ACCESS_TRAP_UNCATEGORIZED is more accurate than CP_ACCESS_TRAP. > This has no visible behavioural change, because the guest doesn't > have a way to see the syndrome value we generate. > > Signed-off-by: Peter Maydell<peter.maydell@linaro.org> > --- > target/arm/tcg/op_helper.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) Reviewed-by: Richard Henderson <richard.henderson@linaro.org> r~
diff --git a/target/arm/tcg/op_helper.c b/target/arm/tcg/op_helper.c index c427118655d..c69d2ac643f 100644 --- a/target/arm/tcg/op_helper.c +++ b/target/arm/tcg/op_helper.c @@ -764,7 +764,7 @@ const void *HELPER(access_check_cp_reg)(CPUARMState *env, uint32_t key, if (arm_feature(env, ARM_FEATURE_XSCALE) && ri->cp < 14 && extract32(env->cp15.c15_cpar, ri->cp, 1) == 0) { - res = CP_ACCESS_TRAP; + res = CP_ACCESS_TRAP_UNCATEGORIZED; goto fail; }
On XScale CPUs, there is no EL2 or AArch64, so no syndrome register. These traps are just UNDEFs in the traditional AArch32 sense, so CP_ACCESS_TRAP_UNCATEGORIZED is more accurate than CP_ACCESS_TRAP. This has no visible behavioural change, because the guest doesn't have a way to see the syndrome value we generate. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> --- target/arm/tcg/op_helper.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)