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nvic: Implement v8M changes to fixed priority exceptions

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In v7M, the fixed-priority exceptions are:
 Reset: -3
 NMI: -2
 HardFault: -1

In v8M, this changes because Secure HardFault may need
to be prioritised above NMI:
 Reset: -4
 Secure HardFault if AIRCR.BFHFNMINS == 1: -3
 NMI: -2
 Secure HardFault if AIRCR.BFHFNMINS == 0: -1
 NonSecure HardFault: -1

Make these changes, including support for changing the
priority of Secure HardFault as AIRCR.BFHFNMINS changes.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 1505240046-11454-14-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2017-09-12 19:14:00 +01:00
parent 94a34abe32
commit 331f4bae6c
1 changed files with 19 additions and 3 deletions
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22
hw/intc/armv7m_nvic.c
View file

@ -937,6 +937,12 @@ static void nvic_writel(NVICState *s, uint32_t offset, uint32_t value,
(R_V7M_AIRCR_SYSRESETREQS_MASK |
R_V7M_AIRCR_BFHFNMINS_MASK |
R_V7M_AIRCR_PRIS_MASK);
/* BFHFNMINS changes the priority of Secure HardFault */
if (cpu->env.v7m.aircr & R_V7M_AIRCR_BFHFNMINS_MASK) {
s->sec_vectors[ARMV7M_EXCP_HARD].prio = -3;
} else {
s->sec_vectors[ARMV7M_EXCP_HARD].prio = -1;
}
}
nvic_irq_update(s);
}
@ -1452,9 +1458,12 @@ static int nvic_post_load(void *opaque, int version_id)
{
NVICState *s = opaque;
unsigned i;
int resetprio;
/* Check for out of range priority settings */
if (s->vectors[ARMV7M_EXCP_RESET].prio != -3 ||
resetprio = arm_feature(&s->cpu->env, ARM_FEATURE_V8) ? -4 : -3;
if (s->vectors[ARMV7M_EXCP_RESET].prio != resetprio ||
s->vectors[ARMV7M_EXCP_NMI].prio != -2 ||
s->vectors[ARMV7M_EXCP_HARD].prio != -1) {
return 1;
@ -1497,7 +1506,12 @@ static int nvic_security_post_load(void *opaque, int version_id)
int i;
/* Check for out of range priority settings */
if (s->sec_vectors[ARMV7M_EXCP_HARD].prio != -1) {
if (s->sec_vectors[ARMV7M_EXCP_HARD].prio != -1
&& s->sec_vectors[ARMV7M_EXCP_HARD].prio != -3) {
/* We can't cross-check against AIRCR.BFHFNMINS as we don't know
* if the CPU state has been migrated yet; a mismatch won't
* cause the emulation to blow up, though.
*/
return 1;
}
for (i = ARMV7M_EXCP_MEM; i < ARRAY_SIZE(s->sec_vectors); i++) {
@ -1548,6 +1562,7 @@ static Property props_nvic[] = {
static void armv7m_nvic_reset(DeviceState *dev)
{
int resetprio;
NVICState *s = NVIC(dev);
s->vectors[ARMV7M_EXCP_NMI].enabled = 1;
@ -1560,7 +1575,8 @@ static void armv7m_nvic_reset(DeviceState *dev)
s->vectors[ARMV7M_EXCP_PENDSV].enabled = 1;
s->vectors[ARMV7M_EXCP_SYSTICK].enabled = 1;
s->vectors[ARMV7M_EXCP_RESET].prio = -3;
resetprio = arm_feature(&s->cpu->env, ARM_FEATURE_V8) ? -4 : -3;
s->vectors[ARMV7M_EXCP_RESET].prio = resetprio;
s->vectors[ARMV7M_EXCP_NMI].prio = -2;
s->vectors[ARMV7M_EXCP_HARD].prio = -1;