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target-arm: A32: Emulate the SMC instruction 

Implements SMC instruction in AArch32 using the A32 syndrome. When executing
SMC instruction from monitor CPU mode SCR.NS bit is reset.

Signed-off-by: Sergey Fedorov <s.fedorov@samsung.com>
Signed-off-by: Fabian Aggeler <aggelerf@ethz.ch>
Signed-off-by: Greg Bellows <greg.bellows@linaro.org>
Message-id: 1413910544-20150-7-git-send-email-greg.bellows@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Fabian Aggeler 2014-10-24 12:19:15 +01:00 committed by Peter Maydell
parent 592125f83a
commit dbe9d16367
2 changed files with 12 additions and 2 deletions
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11
target-arm/helper.c
View File

@ -4091,6 +4091,12 @@ void arm_cpu_do_interrupt(CPUState *cs)
mask = CPSR_A | CPSR_I | CPSR_F; mask = CPSR_A | CPSR_I | CPSR_F;
offset = 4; offset = 4;
break; break;
case EXCP_SMC:
new_mode = ARM_CPU_MODE_MON;
addr = 0x08;
mask = CPSR_A | CPSR_I | CPSR_F;
offset = 0;
break;
default: default:
cpu_abort(cs, "Unhandled exception 0x%x\n", cs->exception_index); cpu_abort(cs, "Unhandled exception 0x%x\n", cs->exception_index);
return; /* Never happens. Keep compiler happy. */ return; /* Never happens. Keep compiler happy. */
@ -4109,6 +4115,11 @@ void arm_cpu_do_interrupt(CPUState *cs)
*/ */
addr += env->cp15.vbar_el[1]; addr += env->cp15.vbar_el[1];
} }
if ((env->uncached_cpsr & CPSR_M) == ARM_CPU_MODE_MON) {
env->cp15.scr_el3 &= ~SCR_NS;
}
switch_mode (env, new_mode); switch_mode (env, new_mode);
/* For exceptions taken to AArch32 we must clear the SS bit in both /* For exceptions taken to AArch32 we must clear the SS bit in both
* PSTATE and in the old-state value we save to SPSR_<mode>, so zero it now. * PSTATE and in the old-state value we save to SPSR_<mode>, so zero it now.

3
target-arm/op_helper.c
View File

@ -429,8 +429,7 @@ void HELPER(pre_smc)(CPUARMState *env, uint32_t syndrome)
{ {
ARMCPU *cpu = arm_env_get_cpu(env); ARMCPU *cpu = arm_env_get_cpu(env);
int cur_el = arm_current_el(env); int cur_el = arm_current_el(env);
/* FIXME: Use real secure state. */ bool secure = arm_is_secure(env);
bool secure = false;
bool smd = env->cp15.scr_el3 & SCR_SMD; bool smd = env->cp15.scr_el3 & SCR_SMD;
/* On ARMv8 AArch32, SMD only applies to NS state. /* On ARMv8 AArch32, SMD only applies to NS state.
* On ARMv7 SMD only applies to NS state and only if EL2 is available. * On ARMv7 SMD only applies to NS state and only if EL2 is available.