| Message ID | 1524699938-6764-20-git-send-email-mjc@sifive.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, Apr 25, 2018 at 5:10 PM Michael Clark <mjc@sifive.com> wrote: > The mstatus.MXR alias in sstatus should only be writable > by S-mode if the privileged ISA version >= v1.10. Also MXR > was masked in sstatus CSR read but not sstatus CSR writes. > Now we correctly mask sstatus.mxr in both read and write. > Cc: Sagar Karandikar <sagark@eecs.berkeley.edu> > Cc: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> > Cc: Palmer Dabbelt <palmer@sifive.com> > Cc: Alistair Francis <Alistair.Francis@wdc.com> > Signed-off-by: Michael Clark <mjc@sifive.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Alistair > --- > target/riscv/op_helper.c | 7 +++++-- > 1 file changed, 5 insertions(+), 2 deletions(-) > diff --git a/target/riscv/op_helper.c b/target/riscv/op_helper.c > index b81b9b6..88c263a 100644 > --- a/target/riscv/op_helper.c > +++ b/target/riscv/op_helper.c > @@ -236,7 +236,10 @@ void csr_write_helper(CPURISCVState *env, target_ulong val_to_write, > target_ulong ms = env->mstatus; > target_ulong mask = SSTATUS_SIE | SSTATUS_SPIE | SSTATUS_UIE > | SSTATUS_UPIE | SSTATUS_SPP | SSTATUS_FS | SSTATUS_XS > - | SSTATUS_SUM | SSTATUS_MXR | SSTATUS_SD; > + | SSTATUS_SUM | SSTATUS_SD; > + if (env->priv_ver >= PRIV_VERSION_1_10_0) { > + mask |= SSTATUS_MXR; > + } > ms = (ms & ~mask) | (val_to_write & mask); > csr_write_helper(env, ms, CSR_MSTATUS); > break; > @@ -439,7 +442,7 @@ target_ulong csr_read_helper(CPURISCVState *env, target_ulong csrno) > case CSR_SSTATUS: { > target_ulong mask = SSTATUS_SIE | SSTATUS_SPIE | SSTATUS_UIE > | SSTATUS_UPIE | SSTATUS_SPP | SSTATUS_FS | SSTATUS_XS > - | SSTATUS_SUM | SSTATUS_SD; > + | SSTATUS_SUM | SSTATUS_SD; > if (env->priv_ver >= PRIV_VERSION_1_10_0) { > mask |= SSTATUS_MXR; > } > -- > 2.7.0
diff --git a/target/riscv/op_helper.c b/target/riscv/op_helper.c index b81b9b6..88c263a 100644 --- a/target/riscv/op_helper.c +++ b/target/riscv/op_helper.c @@ -236,7 +236,10 @@ void csr_write_helper(CPURISCVState *env, target_ulong val_to_write, target_ulong ms = env->mstatus; target_ulong mask = SSTATUS_SIE | SSTATUS_SPIE | SSTATUS_UIE | SSTATUS_UPIE | SSTATUS_SPP | SSTATUS_FS | SSTATUS_XS - | SSTATUS_SUM | SSTATUS_MXR | SSTATUS_SD; + | SSTATUS_SUM | SSTATUS_SD; + if (env->priv_ver >= PRIV_VERSION_1_10_0) { + mask |= SSTATUS_MXR; + } ms = (ms & ~mask) | (val_to_write & mask); csr_write_helper(env, ms, CSR_MSTATUS); break; @@ -439,7 +442,7 @@ target_ulong csr_read_helper(CPURISCVState *env, target_ulong csrno) case CSR_SSTATUS: { target_ulong mask = SSTATUS_SIE | SSTATUS_SPIE | SSTATUS_UIE | SSTATUS_UPIE | SSTATUS_SPP | SSTATUS_FS | SSTATUS_XS - | SSTATUS_SUM | SSTATUS_SD; + | SSTATUS_SUM | SSTATUS_SD; if (env->priv_ver >= PRIV_VERSION_1_10_0) { mask |= SSTATUS_MXR; }
The mstatus.MXR alias in sstatus should only be writable by S-mode if the privileged ISA version >= v1.10. Also MXR was masked in sstatus CSR read but not sstatus CSR writes. Now we correctly mask sstatus.mxr in both read and write. Cc: Sagar Karandikar <sagark@eecs.berkeley.edu> Cc: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Alistair Francis <Alistair.Francis@wdc.com> Signed-off-by: Michael Clark <mjc@sifive.com> --- target/riscv/op_helper.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)