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target-arm: implement arm_debug_target_el()

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Implement debug exception routing according to ARM ARM D2.3.1 Pseudocode
description of routing debug exceptions.

Backports commit 81669b8b81eb450d7b89ee5fdd57bdb73d87022d from qemu
This commit is contained in:
Sergey Fedorov 2018-02-16 14:47:42 -05:00 committed by Lioncash
parent 9b5cd0cec1
commit cb04e919ab
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 16 additions and 1 deletions
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15
qemu/target-arm/cpu.h
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@ -1725,7 +1725,22 @@ static inline int cpu_mmu_index(CPUARMState *env, bool ifetch)
*/
static inline int arm_debug_target_el(CPUARMState *env)
{
bool secure = arm_is_secure(env);
bool route_to_el2 = false;
if (arm_feature(env, ARM_FEATURE_EL2) && !secure) {
route_to_el2 = env->cp15.hcr_el2 & HCR_TGE ||
env->cp15.mdcr_el2 & (1 << 8);
}
if (route_to_el2) {
return 2;
} else if (arm_feature(env, ARM_FEATURE_EL3) &&
!arm_el_is_aa64(env, 3) && secure) {
return 3;
} else {
return 1;
}
}
static inline bool aa64_generate_debug_exceptions(CPUARMState *env)