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target/riscv: Create xl field in env

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Current xlen has been used in helper functions and many other places.
The computation of current xlen is not so trivial, so that we should
recompute it as little as possible.

Fortunately, xlen only changes in very seldom cases, such as exception,
misa write, mstatus write, cpu reset, migration load. So that we can only
recompute xlen in this places and cache it into CPURISCVState.

Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20220120122050.41546-6-zhiwei_liu@c-sky.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
LIU Zhiwei 2022-01-20 20:20:32 +08:00 • committed by Alistair Francis
parent 40f0c2046c
commit 440544e1cf
5 changed files with 46 additions and 32 deletions
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34
target/riscv/cpu_helper.c
View file

@ -35,37 +35,6 @@ int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch)
#endif
}
static RISCVMXL cpu_get_xl(CPURISCVState *env)
{
#if defined(TARGET_RISCV32)
return MXL_RV32;
#elif defined(CONFIG_USER_ONLY)
return MXL_RV64;
#else
RISCVMXL xl = riscv_cpu_mxl(env);
/*
* When emulating a 32-bit-only cpu, use RV32.
* When emulating a 64-bit cpu, and MXL has been reduced to RV32,
* MSTATUSH doesn't have UXL/SXL, therefore XLEN cannot be widened
* back to RV64 for lower privs.
*/
if (xl != MXL_RV32) {
switch (env->priv) {
case PRV_M:
break;
case PRV_U:
xl = get_field(env->mstatus, MSTATUS64_UXL);
break;
default: /* PRV_S | PRV_H */
xl = get_field(env->mstatus, MSTATUS64_SXL);
break;
}
}
return xl;
#endif
}
void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc,
target_ulong *cs_base, uint32_t *pflags)
{
@ -148,7 +117,7 @@ void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc,
}
#endif
flags = FIELD_DP32(flags, TB_FLAGS, XL, cpu_get_xl(env));
flags = FIELD_DP32(flags, TB_FLAGS, XL, env->xl);
*pflags = flags;
}
@ -364,6 +333,7 @@ void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv)
}
/* tlb_flush is unnecessary as mode is contained in mmu_idx */
env->priv = newpriv;
env->xl = cpu_recompute_xl(env);
/*
* Clear the load reservation - otherwise a reservation placed in one