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target/riscv: Add User CSRs read-only check 

For U-mode CSRs, read-only check is also needed.

Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Message-id: 20210810014552.4884-1-zhiwei_liu@c-sky.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
LIU Zhiwei 2021-08-10 09:45:52 +08:00 committed by Alistair Francis
parent a8b37120d4
commit 42109837b5
1 changed files with 5 additions and 3 deletions
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8
target/riscv/csr.c
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@ -1422,11 +1422,11 @@ RISCVException riscv_csrrw(CPURISCVState *env, int csrno,
RISCVException ret;
target_ulong old_value;
RISCVCPU *cpu = env_archcpu(env);
int read_only = get_field(csrno, 0xC00) == 3;
/* check privileges and return RISCV_EXCP_ILLEGAL_INST if check fails */
#if !defined(CONFIG_USER_ONLY)
int effective_priv = env->priv;
int read_only = get_field(csrno, 0xC00) == 3;
if (riscv_has_ext(env, RVH) &&
env->priv == PRV_S &&
@ -1439,11 +1439,13 @@ RISCVException riscv_csrrw(CPURISCVState *env, int csrno,
effective_priv++;
}
if ((write_mask && read_only) ||
(!env->debugger && (effective_priv < get_field(csrno, 0x300)))) {
if (!env->debugger && (effective_priv < get_field(csrno, 0x300))) {
return RISCV_EXCP_ILLEGAL_INST;
}
#endif
if (write_mask && read_only) {
return RISCV_EXCP_ILLEGAL_INST;
}
/* ensure the CSR extension is enabled. */
if (!cpu->cfg.ext_icsr) {