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target/arm: fix exception syndrome for AArch32 bkpt insn

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Debug exceptions that target AArch32 Hyp mode are reported differently
than on AAarch64. Internally, Qemu uses the AArch64 syndromes. Therefore
such exceptions need to be either converted to a prefetch abort
(breakpoints, vector catch) or a data abort (watchpoints).

Cc: qemu-stable@nongnu.org
Signed-off-by: Jan Klötzke <jan.kloetzke@kernkonzept.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240127202758.3326381-1-jan.kloetzke@kernkonzept.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Jan Klötzke 2024-02-01 10:57:19 +00:00 committed by Peter Maydell
parent c3709fde59
commit f670be1aad
2 changed files with 26 additions and 0 deletions
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18
target/arm/helper.c
View File

@ -11015,6 +11015,24 @@ static void arm_cpu_do_interrupt_aarch32(CPUState *cs)
}
if (env->exception.target_el == 2) {
/* Debug exceptions are reported differently on AArch32 */
switch (syn_get_ec(env->exception.syndrome)) {
case EC_BREAKPOINT:
case EC_BREAKPOINT_SAME_EL:
case EC_AA32_BKPT:
case EC_VECTORCATCH:
env->exception.syndrome = syn_insn_abort(arm_current_el(env) == 2,
0, 0, 0x22);
break;
case EC_WATCHPOINT:
env->exception.syndrome = syn_set_ec(env->exception.syndrome,
EC_DATAABORT);
break;
case EC_WATCHPOINT_SAME_EL:
env->exception.syndrome = syn_set_ec(env->exception.syndrome,
EC_DATAABORT_SAME_EL);
break;
}
arm_cpu_do_interrupt_aarch32_hyp(cs);
return;
}

8
target/arm/syndrome.h
View File

@ -25,6 +25,8 @@
#ifndef TARGET_ARM_SYNDROME_H
#define TARGET_ARM_SYNDROME_H
#include "qemu/bitops.h"
/* Valid Syndrome Register EC field values */
enum arm_exception_class {
EC_UNCATEGORIZED = 0x00,
@ -80,6 +82,7 @@ typedef enum {
SME_ET_InactiveZA,
} SMEExceptionType;
#define ARM_EL_EC_LENGTH 6
#define ARM_EL_EC_SHIFT 26
#define ARM_EL_IL_SHIFT 25
#define ARM_EL_ISV_SHIFT 24
@ -94,6 +97,11 @@ static inline uint32_t syn_get_ec(uint32_t syn)
return syn >> ARM_EL_EC_SHIFT;
}
static inline uint32_t syn_set_ec(uint32_t syn, uint32_t ec)
{
return deposit32(syn, ARM_EL_EC_SHIFT, ARM_EL_EC_LENGTH, ec);
}
/*
* Utility functions for constructing various kinds of syndrome value.
* Note that in general we follow the AArch64 syndrome values; in a