| Message ID | 20220627141104.669152-3-matheus.ferst@eldorado.org.br |
|---|---|
| State | New |
| Headers | show |
| Series | Fix gen_*_exception error codes | expand |
On 6/27/22 11:11, Matheus Ferst wrote: > Testing on a POWER9 DD2.3, we observed that the Linux kernel delivers a > signal with si_code ILL_PRVOPC (5) when a userspace application tries to > use slbfee. To obtain this behavior on linux-user, we should use > POWERPC_EXCP_PRIV with POWERPC_EXCP_PRIV_OPC. > > No functional change is intended for softmmu targets as > gen_hvpriv_exception uses the same 'exception' argument > (POWERPC_EXCP_HV_EMU) for raise_exception_*, and the powerpc_excp_* > methods do not use lower bits of the exception error code when handling > POWERPC_EXCP_{INVAL,PRIV}. > > Reported-by: Laurent Vivier <laurent@vivier.eu> > Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br> > --- Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com> > target/ppc/translate.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/target/ppc/translate.c b/target/ppc/translate.c > index 55f34eb490..d7e5670c20 100644 > --- a/target/ppc/translate.c > +++ b/target/ppc/translate.c > @@ -5386,12 +5386,12 @@ static void gen_slbmfev(DisasContext *ctx) > static void gen_slbfee_(DisasContext *ctx) > { > #if defined(CONFIG_USER_ONLY) > - gen_inval_exception(ctx, POWERPC_EXCP_PRIV_REG); > + gen_hvpriv_exception(ctx, POWERPC_EXCP_PRIV_OPC); > #else > TCGLabel *l1, *l2; > > if (unlikely(ctx->pr)) { > - gen_inval_exception(ctx, POWERPC_EXCP_PRIV_REG); > + gen_hvpriv_exception(ctx, POWERPC_EXCP_PRIV_OPC); > return; > } > gen_helper_find_slb_vsid(cpu_gpr[rS(ctx->opcode)], cpu_env,
diff --git a/target/ppc/translate.c b/target/ppc/translate.c index 55f34eb490..d7e5670c20 100644 --- a/target/ppc/translate.c +++ b/target/ppc/translate.c @@ -5386,12 +5386,12 @@ static void gen_slbmfev(DisasContext *ctx) static void gen_slbfee_(DisasContext *ctx) { #if defined(CONFIG_USER_ONLY) - gen_inval_exception(ctx, POWERPC_EXCP_PRIV_REG); + gen_hvpriv_exception(ctx, POWERPC_EXCP_PRIV_OPC); #else TCGLabel *l1, *l2; if (unlikely(ctx->pr)) { - gen_inval_exception(ctx, POWERPC_EXCP_PRIV_REG); + gen_hvpriv_exception(ctx, POWERPC_EXCP_PRIV_OPC); return; } gen_helper_find_slb_vsid(cpu_gpr[rS(ctx->opcode)], cpu_env,
Testing on a POWER9 DD2.3, we observed that the Linux kernel delivers a signal with si_code ILL_PRVOPC (5) when a userspace application tries to use slbfee. To obtain this behavior on linux-user, we should use POWERPC_EXCP_PRIV with POWERPC_EXCP_PRIV_OPC. No functional change is intended for softmmu targets as gen_hvpriv_exception uses the same 'exception' argument (POWERPC_EXCP_HV_EMU) for raise_exception_*, and the powerpc_excp_* methods do not use lower bits of the exception error code when handling POWERPC_EXCP_{INVAL,PRIV}. Reported-by: Laurent Vivier <laurent@vivier.eu> Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br> --- target/ppc/translate.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)