sparc64: Reschedule KGDB capture to a software interrupt.
Otherwise it might interrupt switch_to() midstream and use
half-cooked register window state.
Reported-by: Chris Torek <chris.torek@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/include/asm/pil.h b/arch/sparc/include/asm/pil.h
index 32a7efe..26693703 100644
--- a/arch/sparc/include/asm/pil.h
+++ b/arch/sparc/include/asm/pil.h
@@ -24,6 +24,7 @@
#define PIL_DEVICE_IRQ 5
#define PIL_SMP_CALL_FUNC_SNGL 6
#define PIL_DEFERRED_PCR_WORK 7
+#define PIL_KGDB_CAPTURE 8
#define PIL_NORMAL_MAX 14
#define PIL_NMI 15
diff --git a/arch/sparc/kernel/kgdb_64.c b/arch/sparc/kernel/kgdb_64.c
index fefbe6d..f5a0fd4 100644
--- a/arch/sparc/kernel/kgdb_64.c
+++ b/arch/sparc/kernel/kgdb_64.c
@@ -108,7 +108,7 @@
}
#ifdef CONFIG_SMP
-void smp_kgdb_capture_client(struct pt_regs *regs)
+void smp_kgdb_capture_client(int irq, struct pt_regs *regs)
{
unsigned long flags;
diff --git a/arch/sparc/kernel/ttable.S b/arch/sparc/kernel/ttable.S
index d9bdfb9..76d837f 100644
--- a/arch/sparc/kernel/ttable.S
+++ b/arch/sparc/kernel/ttable.S
@@ -64,7 +64,12 @@
tl0_irq6: BTRAP(0x46)
#endif
tl0_irq7: TRAP_IRQ(deferred_pcr_work_irq, 7)
-tl0_irq8: BTRAP(0x48) BTRAP(0x49)
+#ifdef CONFIG_KGDB
+tl0_irq8: TRAP_IRQ(smp_kgdb_capture_client, 8)
+#else
+tl0_irq8: BTRAP(0x48)
+#endif
+tl0_irq9: BTRAP(0x49)
tl0_irq10: BTRAP(0x4a) BTRAP(0x4b) BTRAP(0x4c) BTRAP(0x4d)
tl0_irq14: TRAP_IRQ(timer_interrupt, 14)
tl0_irq15: TRAP_NMI_IRQ(perfctr_irq, 15)
diff --git a/arch/sparc/mm/ultra.S b/arch/sparc/mm/ultra.S
index 80c788e..b57a594 100644
--- a/arch/sparc/mm/ultra.S
+++ b/arch/sparc/mm/ultra.S
@@ -679,28 +679,8 @@
#ifdef CONFIG_KGDB
.globl xcall_kgdb_capture
xcall_kgdb_capture:
-661: rdpr %pstate, %g2
- wrpr %g2, PSTATE_IG | PSTATE_AG, %pstate
- .section .sun4v_2insn_patch, "ax"
- .word 661b
- nop
- nop
- .previous
-
- rdpr %pil, %g2
- wrpr %g0, PIL_NORMAL_MAX, %pil
- sethi %hi(109f), %g7
- ba,pt %xcc, etrap_irq
-109: or %g7, %lo(109b), %g7
-#ifdef CONFIG_TRACE_IRQFLAGS
- call trace_hardirqs_off
- nop
-#endif
- call smp_kgdb_capture_client
- add %sp, PTREGS_OFF, %o0
- /* Has to be a non-v9 branch due to the large distance. */
- ba rtrap_xcall
- ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
+ wr %g0, (1 << PIL_KGDB_CAPTURE), %set_softint
+ retry
#endif
#endif /* CONFIG_SMP */