Author: rpaulo
Date: Mon Aug 30 18:12:21 2010
New Revision: 212004
URL: http://svn.freebsd.org/changeset/base/212004
Log:
When DTrace is enabled, make sure we don't overwrite the IDT_DTRACE_RET
entry with an IRQ for some hardware component.
Reviewed by: jhb
Sponsored by: The FreeBSD Foundation
Modified:
head/sys/x86/x86/local_apic.c
Modified: head/sys/x86/x86/local_apic.c
==============================================================================
--- head/sys/x86/x86/local_apic.c Mon Aug 30 17:34:59 2010
(r212003)
+++ head/sys/x86/x86/local_apic.c Mon Aug 30 18:12:21 2010
(r212004)
@@ -89,6 +89,7 @@ CTASSERT(IPI_STOP < APIC_SPURIOUS_INT);
/* Magic IRQ values for the timer and syscalls. */
#define IRQ_TIMER (NUM_IO_INTS + 1)
#define IRQ_SYSCALL (NUM_IO_INTS + 2)
+#define IRQ_DTRACE_RET (NUM_IO_INTS + 3)
/*
* Support for local APICs. Local APICs manage interrupts on each
@@ -307,6 +308,10 @@ lapic_create(u_int apic_id, int boot_cpu
lapics[apic_id].la_ioint_irqs[IDT_SYSCALL - APIC_IO_INTS] = IRQ_SYSCALL;
lapics[apic_id].la_ioint_irqs[APIC_TIMER_INT - APIC_IO_INTS] =
IRQ_TIMER;
+#ifdef KDTRACE_HOOKS
+ lapics[apic_id].la_ioint_irqs[IDT_DTRACE_RET - APIC_IO_INTS] =
IRQ_DTRACE_RET;
+#endif
+
#ifdef SMP
cpu_add(apic_id, boot_cpu);
@@ -1028,6 +1033,10 @@ apic_enable_vector(u_int apic_id, u_int
KASSERT(vector != IDT_SYSCALL, ("Attempt to overwrite syscall entry"));
KASSERT(ioint_handlers[vector / 32] != NULL,
("No ISR handler for vector %u", vector));
+#ifdef KDTRACE_HOOKS
+ KASSERT(vector != IDT_DTRACE_RET,
+ ("Attempt to overwrite DTrace entry"));
+#endif
setidt(vector, ioint_handlers[vector / 32], SDT_APIC, SEL_KPL,
GSEL_APIC);
}
@@ -1037,6 +1046,10 @@ apic_disable_vector(u_int apic_id, u_int
{
KASSERT(vector != IDT_SYSCALL, ("Attempt to overwrite syscall entry"));
+#ifdef KDTRACE_HOOKS
+ KASSERT(vector != IDT_DTRACE_RET,
+ ("Attempt to overwrite DTrace entry"));
+#endif
KASSERT(ioint_handlers[vector / 32] != NULL,
("No ISR handler for vector %u", vector));
#ifdef notyet
@@ -1060,6 +1073,10 @@ apic_free_vector(u_int apic_id, u_int ve
KASSERT(irq < NUM_IO_INTS, ("Invalid IRQ %u", irq));
KASSERT(lapics[apic_id].la_ioint_irqs[vector - APIC_IO_INTS] ==
irq, ("IRQ mismatch"));
+#ifdef KDTRACE_HOOKS
+ KASSERT(vector != IDT_DTRACE_RET,
+ ("Attempt to overwrite DTrace entry"));
+#endif
/*
* Bind us to the cpu that owned the vector before freeing it so
@@ -1092,6 +1109,10 @@ apic_idt_to_irq(u_int apic_id, u_int vec
KASSERT(vector >= APIC_IO_INTS && vector != IDT_SYSCALL &&
vector <= APIC_IO_INTS + APIC_NUM_IOINTS,
("Vector %u does not map to an IRQ line", vector));
+#ifdef KDTRACE_HOOKS
+ KASSERT(vector != IDT_DTRACE_RET,
+ ("Attempt to overwrite DTrace entry"));
+#endif
irq = lapics[apic_id].la_ioint_irqs[vector - APIC_IO_INTS];
if (irq < 0)
irq = 0;
@@ -1123,6 +1144,10 @@ DB_SHOW_COMMAND(apic, db_show_apic)
irq = lapics[apic_id].la_ioint_irqs[i];
if (irq == -1 || irq == IRQ_SYSCALL)
continue;
+#ifdef KDTRACE_HOOKS
+ if (irq == IRQ_DTRACE_RET)
+ continue;
+#endif
db_printf("vec 0x%2x -> ", i + APIC_IO_INTS);
if (irq == IRQ_TIMER)
db_printf("lapic timer\n");
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