@@ -39,6 +39,35 @@ void riscv_set_csr_ops(int csrno, riscv_csr_operations *ops)
}
/* Predicates */
+static RISCVException smstateen_acc_ok(CPURISCVState *env, int mode, int bit)
+{
+ CPUState *cs = env_cpu(env);
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ bool virt = riscv_cpu_virt_enabled(env);
+
+ if (!cpu->cfg.ext_smstateen) {
+ return RISCV_EXCP_NONE;
+ }
+
+ if (!(env->mstateen[0] & 1UL << bit)) {
+ return RISCV_EXCP_ILLEGAL_INST;
+ }
+
+ if (virt) {
+ if (!(env->hstateen[0] & 1UL << bit)) {
+ return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
+ }
+ }
+
+ if (mode == PRV_U) {
+ if (!(env->sstateen[0] & 1UL << bit)) {
+ return RISCV_EXCP_ILLEGAL_INST;
+ }
+ }
+
+ return RISCV_EXCP_NONE;
+}
+
static RISCVException fs(CPURISCVState *env, int csrno)
{
#if !defined(CONFIG_USER_ONLY)
@@ -1865,6 +1894,13 @@ static RISCVException write_menvcfgh(CPURISCVState *env, int csrno,
static RISCVException read_senvcfg(CPURISCVState *env, int csrno,
target_ulong *val)
{
+ RISCVException ret;
+
+ ret = smstateen_acc_ok(env, PRV_S, SMSTATEEN0_HSENVCFG);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
*val = env->senvcfg;
return RISCV_EXCP_NONE;
}
@@ -1873,15 +1909,27 @@ static RISCVException write_senvcfg(CPURISCVState *env, int csrno,
target_ulong val)
{
uint64_t mask = SENVCFG_FIOM | SENVCFG_CBIE | SENVCFG_CBCFE | SENVCFG_CBZE;
+ RISCVException ret;
- env->senvcfg = (env->senvcfg & ~mask) | (val & mask);
+ ret = smstateen_acc_ok(env, PRV_S, SMSTATEEN0_HSENVCFG);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+ env->senvcfg = (env->senvcfg & ~mask) | (val & mask);
return RISCV_EXCP_NONE;
}
static RISCVException read_henvcfg(CPURISCVState *env, int csrno,
target_ulong *val)
{
+ RISCVException ret;
+
+ ret = smstateen_acc_ok(env, PRV_S, SMSTATEEN0_HSENVCFG);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
*val = env->henvcfg;
return RISCV_EXCP_NONE;
}
@@ -1890,6 +1938,12 @@ static RISCVException write_henvcfg(CPURISCVState *env, int csrno,
target_ulong val)
{
uint64_t mask = HENVCFG_FIOM | HENVCFG_CBIE | HENVCFG_CBCFE | HENVCFG_CBZE;
+ RISCVException ret;
+
+ ret = smstateen_acc_ok(env, PRV_S, SMSTATEEN0_HSENVCFG);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
if (riscv_cpu_mxl(env) == MXL_RV64) {
mask |= HENVCFG_PBMTE | HENVCFG_STCE;
@@ -1903,6 +1957,13 @@ static RISCVException write_henvcfg(CPURISCVState *env, int csrno,
static RISCVException read_henvcfgh(CPURISCVState *env, int csrno,
target_ulong *val)
{
+ RISCVException ret;
+
+ ret = smstateen_acc_ok(env, PRV_S, SMSTATEEN0_HSENVCFG);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+
*val = env->henvcfg >> 32;
return RISCV_EXCP_NONE;
}
@@ -1912,9 +1973,14 @@ static RISCVException write_henvcfgh(CPURISCVState *env, int csrno,
{
uint64_t mask = HENVCFG_PBMTE | HENVCFG_STCE;
uint64_t valh = (uint64_t)val << 32;
+ RISCVException ret;
- env->henvcfg = (env->henvcfg & ~mask) | (valh & mask);
+ ret = smstateen_acc_ok(env, PRV_S, SMSTATEEN0_HSENVCFG);
+ if (ret != RISCV_EXCP_NONE) {
+ return ret;
+ }
+ env->henvcfg = (env->henvcfg & ~mask) | (valh & mask);
return RISCV_EXCP_NONE;
}
@@ -1936,7 +2002,8 @@ static RISCVException write_mstateen(CPURISCVState *env, int csrno,
target_ulong new_val)
{
uint64_t *reg;
- uint64_t wr_mask = 1UL << SMSTATEEN_STATEN;
+ uint64_t wr_mask = (1UL << SMSTATEEN_STATEN) |
+ (1UL << SMSTATEEN0_HSENVCFG);
reg = &env->mstateen[csrno - CSR_MSTATEEN0];
write_smstateen(env, reg, wr_mask, new_val);
@@ -1957,7 +2024,8 @@ static RISCVException write_mstateenh(CPURISCVState *env, int csrno,
{
uint64_t *reg;
uint64_t val;
- uint64_t wr_mask = 1UL << SMSTATEEN_STATEN;
+ uint64_t wr_mask = (1UL << SMSTATEEN_STATEN) |
+ (1UL << SMSTATEEN0_HSENVCFG);
reg = &env->mstateen[csrno - CSR_MSTATEEN0H - 0x10];
val = (uint64_t)new_val << 32;
@@ -1979,7 +2047,8 @@ static RISCVException write_hstateen(CPURISCVState *env, int csrno,
target_ulong new_val)
{
uint64_t *reg;
- uint64_t wr_mask = 1UL << SMSTATEEN_STATEN;
+ uint64_t wr_mask = (1UL << SMSTATEEN_STATEN) |
+ (1UL << SMSTATEEN0_HSENVCFG);
int index = csrno - CSR_HSTATEEN0;
reg = &env->hstateen[index];
@@ -2002,8 +2071,9 @@ static RISCVException write_hstateenh(CPURISCVState *env, int csrno,
{
uint64_t *reg;
uint64_t val;
- uint64_t wr_mask = 1UL << SMSTATEEN_STATEN;
int index = csrno - CSR_HSTATEEN0H - 0x10;
+ uint64_t wr_mask = (1UL << SMSTATEEN_STATEN) |
+ (1UL << SMSTATEEN0_HSENVCFG);
reg = &env->hstateen[index];
val = (uint64_t)new_val << 32;
Accesses to henvcfg, henvcfgh and senvcfg are allowed only if corresponding bit in mstateen0/hstateen0 is enabled. Otherwise an illegal instruction trap is generated. Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com> --- target/riscv/csr.c | 82 ++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 76 insertions(+), 6 deletions(-)