MN10300: Create generic kernel debugger hooks

Create generic kernel debugger hooks in the MN10300 arch and make gdbstub use
them.  This is a preparation for KGDB support.

Signed-off-by: David Howells <dhowells@redhat.com>

1 files changed, 24 insertions, 12 deletions

diff --git a/arch/mn10300/kernel/entry.S b/arch/mn10300/kernel/entry.S
index 8e79a04f1cb0..fb93ad720b82 100644
--- a/arch/mn10300/kernel/entry.S
+++ b/arch/mn10300/kernel/entry.S
@@ -266,7 +266,11 @@ ENTRY(raw_bus_error)
 
 ###############################################################################
 #
-# Miscellaneous exception entry points
+# NMI exception entry points
+#
+# This is used by ordinary interrupt channels that have the GxICR_NMI bit set
+# in addition to the main NMI and Watchdog channels.  SMP NMI IPIs use this
+# facility.
 #
 ###############################################################################
 ENTRY(nmi_handler)
@@ -281,7 +285,7 @@ ENTRY(nmi_handler)
         and     NMIAGR_GN,d0
         lsr     0x2,d0
         cmp     CALL_FUNCTION_NMI_IPI,d0
-        bne     5f                      # if not call function, jump
+        bne     nmi_not_smp_callfunc    # if not call function, jump
 
         # function call nmi ipi
         add     4,sp                    # no need to store TBR
@@ -295,30 +299,38 @@ ENTRY(nmi_handler)
         call    smp_nmi_call_function_interrupt[],0
         RESTORE_ALL
 
-5:
-#ifdef CONFIG_GDBSTUB
-        cmp     GDB_NMI_IPI,d0
-        bne     3f                      # if not gdb nmi ipi, jump
+nmi_not_smp_callfunc:
+#ifdef CONFIG_KERNEL_DEBUGGER
+        cmp     DEBUGGER_NMI_IPI,d0
+        bne     nmi_not_debugger        # if not kernel debugger NMI IPI, jump
 
-        # gdb nmi ipi
+        # kernel debugger NMI IPI
         add     4,sp                    # no need to store TBR
         mov     GxICR_DETECT,d0         # clear NMI
-        movbu   d0,(GxICR(GDB_NMI_IPI))
-        movhu   (GxICR(GDB_NMI_IPI)),d0
+        movbu   d0,(GxICR(DEBUGGER_NMI_IPI))
+        movhu   (GxICR(DEBUGGER_NMI_IPI)),d0
         and     ~EPSW_NMID,epsw         # enable NMI
 
         mov     (sp),d0
         SAVE_ALL
-        call    gdbstub_nmi_wait[],0
+        mov     fp,d0                   # arg 0: stacked register file
+        mov     a2,d1                   # arg 1: exception number
+        call    debugger_nmi_interrupt[],0
         RESTORE_ALL
-3:
-#endif /* CONFIG_GDBSTUB */
+
+nmi_not_debugger:
+#endif /* CONFIG_KERNEL_DEBUGGER */
         mov     (sp),d0                 # restore TBR to d0
         add     4,sp
 #endif /* CONFIG_SMP */
 
         bra     __common_exception_nonmi
 
+###############################################################################
+#
+# General exception entry point
+#
+###############################################################################
 ENTRY(__common_exception)
         add     -4,sp
         mov     d0,(sp)