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arm: fix aa64_generate_debug_exceptions to work with EL2

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The test was incomplete and incorrectly caused debug exceptions to be
generated when returning to EL2 after a failed attempt to single-step
an EL1 instruction. Fix this while cleaning up the function a little.

Backports commit 22af90255ec2100a44cbbb7f0460ba15eed79538 from qemu
This commit is contained in:
Alex Bennée 2018-11-16 21:43:39 -05:00 committed by Lioncash
parent 2a3edfce37
commit 5b4c46eeab
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 24 additions and 12 deletions
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36
qemu/target/arm/cpu.h
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@ -2713,23 +2713,35 @@ static inline bool arm_v7m_csselr_razwi(ARMCPU *cpu)
return (cpu->clidr & R_V7M_CLIDR_CTYPE_ALL_MASK) != 0;
}
/* See AArch64.GenerateDebugExceptionsFrom() in ARM ARM pseudocode */
static inline bool aa64_generate_debug_exceptions(CPUARMState *env)
{
if (arm_is_secure(env)) {
/* MDCR_EL3.SDD disables debug events from Secure state */
if (extract32(env->cp15.mdcr_el3, 16, 1) != 0
|| arm_current_el(env) == 3) {
return false;
}
int cur_el = arm_current_el(env);
int debug_el;
if (cur_el == 3) {
return false;
}
if (arm_current_el(env) == arm_debug_target_el(env)) {
if ((extract32(env->cp15.mdscr_el1, 13, 1) == 0)
|| (env->daif & PSTATE_D)) {
return false;
}
/* MDCR_EL3.SDD disables debug events from Secure state */
if (arm_is_secure_below_el3(env)
&& extract32(env->cp15.mdcr_el3, 16, 1)) {
return false;
}
return true;
/*
* Same EL to same EL debug exceptions need MDSCR_KDE enabled
* while not masking the (D)ebug bit in DAIF.
*/
debug_el = arm_debug_target_el(env);
if (cur_el == debug_el) {
return extract32(env->cp15.mdscr_el1, 13, 1)
&& !(env->daif & PSTATE_D);
}
/* Otherwise the debug target needs to be a higher EL */
return debug_el > cur_el;
}
static inline bool aa32_generate_debug_exceptions(CPUARMState *env)