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target/arm: New utility function to extract EC from syndrome

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Create and use a utility function to extract the EC field
from a syndrome, rather than open-coding the shift.

Backports commit 64b91e3f890a8c221b65c6820a5ee39107ee40f5 from qemu
This commit is contained in:
Peter Maydell 2018-11-10 09:27:38 -05:00 committed by Lioncash
parent ebe442b1d4
commit 99516b43a3
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GPG key ID: 4E3C3CC1031BA9C7
3 changed files with 8 additions and 3 deletions
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4
qemu/target/arm/helper.c
View file

@ -7531,7 +7531,7 @@ static void arm_cpu_do_interrupt_aarch32_(CPUState *cs)
uint32_t moe;
/* If this is a debug exception we must update the DBGDSCR.MOE bits */
switch (env->exception.syndrome >> ARM_EL_EC_SHIFT) {
switch (syn_get_ec(env->exception.syndrome)) {
case EC_BREAKPOINT:
case EC_BREAKPOINT_SAME_EL:
moe = 1;
@ -7877,7 +7877,7 @@ void arm_cpu_do_interrupt(CPUState *cs)
if (qemu_loglevel_mask(CPU_LOG_INT)
&& !excp_is_internal(cs->exception_index)) {
qemu_log_mask(CPU_LOG_INT, "...with ESR 0x%x/0x%" PRIx32 "\n",
env->exception.syndrome >> ARM_EL_EC_SHIFT,
syn_get_ec(env->exception.syndrome),
env->exception.syndrome);
}

5
qemu/target/arm/internals.h
View file

@ -280,6 +280,11 @@ enum arm_exception_class {
#define ARM_EL_IL (1 << ARM_EL_IL_SHIFT)
#define ARM_EL_ISV (1 << ARM_EL_ISV_SHIFT)
static inline uint32_t syn_get_ec(uint32_t syn)
{
return syn >> ARM_EL_EC_SHIFT;
}
/* Utility functions for constructing various kinds of syndrome value.
* Note that in general we follow the AArch64 syndrome values; in a
* few cases the value in HSR for exceptions taken to AArch32 Hyp

2
qemu/target/arm/op_helper.c
View file

@ -41,7 +41,7 @@ void raise_exception(CPUARMState *env, uint32_t excp,
* (see DDI0478C.a D1.10.4)
*/
target_el = 2;
if (syndrome >> ARM_EL_EC_SHIFT == EC_ADVSIMDFPACCESSTRAP) {
if (syn_get_ec(syndrome) == EC_ADVSIMDFPACCESSTRAP) {
syndrome = syn_uncategorized();
}
}