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Clean up handling of unexpected exceptions. Previously we would issue a

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breakpoint instruction, however this would lose information that may be
useful for debugging.

These are now handled in a similar way to other exceptions, however it
won't exit out of the exception handler until it is known if we can
handle these exceptions in a useful way.

Sponsored by:	DARPA, AFRL
This commit is contained in:
Andrew Turner 2018-06-10 16:21:21 +00:00
parent 3cd246d9a9
commit dc9b99a884
2 changed files with 43 additions and 16 deletions
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29
sys/arm64/arm64/exception.S
View File

@ -161,10 +161,6 @@ ENTRY(handle_el1h_irq)
eret
END(handle_el1h_irq)
ENTRY(handle_el1h_error)
brk 0xf13
END(handle_el1h_error)
ENTRY(handle_el0_sync)
save_registers 0
ldr x0, [x18, #PC_CURTHREAD]
@ -185,18 +181,23 @@ ENTRY(handle_el0_irq)
eret
END(handle_el0_irq)
ENTRY(handle_el0_error)
ENTRY(handle_serror)
save_registers 0
mov x0, sp
bl do_el0_error
brk 0xf23
1: b 1b
END(handle_el0_error)
1: bl do_serror
b 1b
END(handle_serror)
ENTRY(handle_empty_exception)
save_registers 0
mov x0, sp
1: bl unhandled_exception
b 1b
END(handle_unhandled_exception)
.macro vempty
.align 7
brk 0xfff
1: b 1b
b handle_empty_exception
.endm
.macro vector name
@ -215,15 +216,15 @@ exception_vectors:
vector el1h_sync /* Synchronous EL1h */
vector el1h_irq /* IRQ EL1h */
vempty /* FIQ EL1h */
vector el1h_error /* Error EL1h */
vector serror /* Error EL1h */
vector el0_sync /* Synchronous 64-bit EL0 */
vector el0_irq /* IRQ 64-bit EL0 */
vempty /* FIQ 64-bit EL0 */
vector el0_error /* Error 64-bit EL0 */
vector serror /* Error 64-bit EL0 */
vector el0_sync /* Synchronous 32-bit EL0 */
vector el0_irq /* IRQ 32-bit EL0 */
vempty /* FIQ 32-bit EL0 */
vector el0_error /* Error 32-bit EL0 */
vector serror /* Error 32-bit EL0 */

30
sys/arm64/arm64/trap.c
View File

@ -76,6 +76,9 @@ extern register_t fsu_intr_fault;
void do_el1h_sync(struct thread *, struct trapframe *);
void do_el0_sync(struct thread *, struct trapframe *);
void do_el0_error(struct trapframe *);
void do_serror(struct trapframe *);
void unhandled_exception(struct trapframe *);
static void print_registers(struct trapframe *frame);
int (*dtrace_invop_jump_addr)(struct trapframe *);
@ -477,10 +480,33 @@ do_el0_sync(struct thread *td, struct trapframe *frame)
("Kernel VFP state in use when entering userspace"));
}
/*
* TODO: We will need to handle these later when we support ARMv8.2 RAS.
*/
void
do_el0_error(struct trapframe *frame)
do_serror(struct trapframe *frame)
{
uint64_t esr, far;
panic("ARM64TODO: do_el0_error");
far = READ_SPECIALREG(far_el1);
esr = frame->tf_esr;
print_registers(frame);
printf(" far: %16lx\n", far);
printf(" esr: %.8lx\n", esr);
panic("Unhandled System Error");
}
void
unhandled_exception(struct trapframe *frame)
{
uint64_t esr, far;
far = READ_SPECIALREG(far_el1);
esr = frame->tf_esr;
print_registers(frame);
printf(" far: %16lx\n", far);
printf(" esr: %.8lx\n", esr);
panic("Unhandled exception");
}