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target/arm: Split helper_msr_i_pstate into 3 

The EL0+UMA check is unique to DAIF.  While SPSel had avoided the
check by nature of already checking EL >= 1, the other post v8.0
extensions to MSR (imm) allow EL0 and do not require UMA.  Avoid
the unconditional write to pc and use raise_exception_ra to unwind.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20190301200501.16533-5-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2019-03-01 12:04:55 -08:00 committed by Peter Maydell
parent cb570bd318
commit ff730e9666
6 changed files with 73 additions and 59 deletions
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30
target/arm/helper-a64.c
View File

@ -61,6 +61,36 @@ uint64_t HELPER(rbit64)(uint64_t x)
return revbit64(x);
}
void HELPER(msr_i_spsel)(CPUARMState *env, uint32_t imm)
{
update_spsel(env, imm);
}
static void daif_check(CPUARMState *env, uint32_t op,
uint32_t imm, uintptr_t ra)
{
/* DAIF update to PSTATE. This is OK from EL0 only if UMA is set. */
if (arm_current_el(env) == 0 && !(env->cp15.sctlr_el[1] & SCTLR_UMA)) {
raise_exception_ra(env, EXCP_UDEF,
syn_aa64_sysregtrap(0, extract32(op, 0, 3),
extract32(op, 3, 3), 4,
imm, 0x1f, 0),
exception_target_el(env), ra);
}
}
void HELPER(msr_i_daifset)(CPUARMState *env, uint32_t imm)
{
daif_check(env, 0x1e, imm, GETPC());
env->daif |= (imm << 6) & PSTATE_DAIF;
}
void HELPER(msr_i_daifclear)(CPUARMState *env, uint32_t imm)
{
daif_check(env, 0x1f, imm, GETPC());
env->daif &= ~((imm << 6) & PSTATE_DAIF);
}
/* Convert a softfloat float_relation_ (as returned by
* the float*_compare functions) to the correct ARM
* NZCV flag state.

3
target/arm/helper-a64.h
View File

@ -19,6 +19,9 @@
DEF_HELPER_FLAGS_2(udiv64, TCG_CALL_NO_RWG_SE, i64, i64, i64)
DEF_HELPER_FLAGS_2(sdiv64, TCG_CALL_NO_RWG_SE, s64, s64, s64)
DEF_HELPER_FLAGS_1(rbit64, TCG_CALL_NO_RWG_SE, i64, i64)
DEF_HELPER_2(msr_i_spsel, void, env, i32)
DEF_HELPER_2(msr_i_daifset, void, env, i32)
DEF_HELPER_2(msr_i_daifclear, void, env, i32)
DEF_HELPER_3(vfp_cmph_a64, i64, f16, f16, ptr)
DEF_HELPER_3(vfp_cmpeh_a64, i64, f16, f16, ptr)
DEF_HELPER_3(vfp_cmps_a64, i64, f32, f32, ptr)

1
target/arm/helper.h
View File

@ -77,7 +77,6 @@ DEF_HELPER_2(get_cp_reg, i32, env, ptr)
DEF_HELPER_3(set_cp_reg64, void, env, ptr, i64)
DEF_HELPER_2(get_cp_reg64, i64, env, ptr)
DEF_HELPER_3(msr_i_pstate, void, env, i32, i32)
DEF_HELPER_1(clear_pstate_ss, void, env)
DEF_HELPER_2(get_r13_banked, i32, env, i32)

15
target/arm/internals.h
View File

@ -968,4 +968,19 @@ ARMVAParameters aa64_va_parameters_both(CPUARMState *env, uint64_t va,
ARMVAParameters aa64_va_parameters(CPUARMState *env, uint64_t va,
ARMMMUIdx mmu_idx, bool data);
static inline int exception_target_el(CPUARMState *env)
{
int target_el = MAX(1, arm_current_el(env));
/*
* No such thing as secure EL1 if EL3 is aarch32,
* so update the target EL to EL3 in this case.
*/
if (arm_is_secure(env) && !arm_el_is_aa64(env, 3) && target_el == 1) {
target_el = 3;
}
return target_el;
}
#endif

42
target/arm/op_helper.c
View File

@ -68,20 +68,6 @@ void raise_exception_ra(CPUARMState *env, uint32_t excp, uint32_t syndrome,
cpu_loop_exit_restore(cs, ra);
}
static int exception_target_el(CPUARMState *env)
{
int target_el = MAX(1, arm_current_el(env));
/* No such thing as secure EL1 if EL3 is aarch32, so update the target EL
* to EL3 in this case.
*/
if (arm_is_secure(env) && !arm_el_is_aa64(env, 3) && target_el == 1) {
target_el = 3;
}
return target_el;
}
uint32_t HELPER(neon_tbl)(uint32_t ireg, uint32_t def, void *vn,
uint32_t maxindex)
{
@ -875,34 +861,6 @@ uint64_t HELPER(get_cp_reg64)(CPUARMState *env, void *rip)
return res;
}
void HELPER(msr_i_pstate)(CPUARMState *env, uint32_t op, uint32_t imm)
{
/* MSR_i to update PSTATE. This is OK from EL0 only if UMA is set.
* Note that SPSel is never OK from EL0; we rely on handle_msr_i()
* to catch that case at translate time.
*/
if (arm_current_el(env) == 0 && !(env->cp15.sctlr_el[1] & SCTLR_UMA)) {
uint32_t syndrome = syn_aa64_sysregtrap(0, extract32(op, 0, 3),
extract32(op, 3, 3), 4,
imm, 0x1f, 0);
raise_exception(env, EXCP_UDEF, syndrome, exception_target_el(env));
}
switch (op) {
case 0x05: /* SPSel */
update_spsel(env, imm);
break;
case 0x1e: /* DAIFSet */
env->daif |= (imm << 6) & PSTATE_DAIF;
break;
case 0x1f: /* DAIFClear */
env->daif &= ~((imm << 6) & PSTATE_DAIF);
break;
default:
g_assert_not_reached();
}
}
void HELPER(clear_pstate_ss)(CPUARMState *env)
{
env->pstate &= ~PSTATE_SS;

41
target/arm/translate-a64.c
View File

@ -1661,29 +1661,38 @@ static void handle_sync(DisasContext *s, uint32_t insn,
static void handle_msr_i(DisasContext *s, uint32_t insn,
unsigned int op1, unsigned int op2, unsigned int crm)
{
TCGv_i32 t1;
int op = op1 << 3 | op2;
/* End the TB by default, chaining is ok. */
s->base.is_jmp = DISAS_TOO_MANY;
switch (op) {
case 0x05: /* SPSel */
if (s->current_el == 0) {
unallocated_encoding(s);
return;
goto do_unallocated;
}
/* fall through */
case 0x1e: /* DAIFSet */
case 0x1f: /* DAIFClear */
{
TCGv_i32 tcg_imm = tcg_const_i32(crm);
TCGv_i32 tcg_op = tcg_const_i32(op);
gen_a64_set_pc_im(s->pc - 4);
gen_helper_msr_i_pstate(cpu_env, tcg_op, tcg_imm);
tcg_temp_free_i32(tcg_imm);
tcg_temp_free_i32(tcg_op);
/* For DAIFClear, exit the cpu loop to re-evaluate pending IRQs. */
gen_a64_set_pc_im(s->pc);
s->base.is_jmp = (op == 0x1f ? DISAS_EXIT : DISAS_JUMP);
t1 = tcg_const_i32(crm & PSTATE_SP);
gen_helper_msr_i_spsel(cpu_env, t1);
tcg_temp_free_i32(t1);
break;
}
case 0x1e: /* DAIFSet */
t1 = tcg_const_i32(crm);
gen_helper_msr_i_daifset(cpu_env, t1);
tcg_temp_free_i32(t1);
break;
case 0x1f: /* DAIFClear */
t1 = tcg_const_i32(crm);
gen_helper_msr_i_daifclear(cpu_env, t1);
tcg_temp_free_i32(t1);
/* For DAIFClear, exit the cpu loop to re-evaluate pending IRQs. */
s->base.is_jmp = DISAS_UPDATE;
break;
default:
do_unallocated:
unallocated_encoding(s);
return;
}