10 files changed, 50 insertions, 2 deletions

diff --git a/arch/mips/Kconfig.debug b/arch/mips/Kconfig.debug
index 515f9e611307..5d6afb52d904 100644
--- a/arch/mips/Kconfig.debug
+++ b/arch/mips/Kconfig.debug
@@ -1,5 +1,9 @@
 menu "Kernel hacking"
 
+config TRACE_IRQFLAGS_SUPPORT
+        bool
+        default y
+
 source "lib/Kconfig.debug"
 
 config CROSSCOMPILE
diff --git a/arch/mips/kernel/entry.S b/arch/mips/kernel/entry.S
index 01e7fa86aa43..766655f35250 100644
--- a/arch/mips/kernel/entry.S
+++ b/arch/mips/kernel/entry.S
@@ -113,6 +113,21 @@ FEXPORT(restore_all)			# restore full frame
         RESTORE_AT
         RESTORE_STATIC
 FEXPORT(restore_partial)                # restore partial frame
+#ifdef CONFIG_TRACE_IRQFLAGS
+        SAVE_STATIC
+        SAVE_AT
+        SAVE_TEMP
+        LONG_L  v0, PT_STATUS(sp)
+        and     v0, 1
+        beqz    v0, 1f
+        jal     trace_hardirqs_on
+        b       2f
+1:      jal     trace_hardirqs_off
+2:
+        RESTORE_TEMP
+        RESTORE_AT
+        RESTORE_STATIC
+#endif
         RESTORE_SOME
         RESTORE_SP_AND_RET
         .set    at
diff --git a/arch/mips/kernel/gdb-low.S b/arch/mips/kernel/gdb-low.S
index 666bc9014cbd..2c446063636a 100644
--- a/arch/mips/kernel/gdb-low.S
+++ b/arch/mips/kernel/gdb-low.S
@@ -7,6 +7,7 @@
 
 #include <asm/asm.h>
 #include <asm/errno.h>
+#include <asm/irqflags.h>
 #include <asm/mipsregs.h>
 #include <asm/regdef.h>
 #include <asm/stackframe.h>
@@ -120,6 +121,7 @@
                 LONG_S  $31, GDB_FR_REG31(sp)
 
                 CLI                             /* disable interrupts */
+                TRACE_IRQS_OFF
 
 /*
  * Followed by the floating point registers
diff --git a/arch/mips/kernel/genex.S b/arch/mips/kernel/genex.S
index b563811b1b27..37fda3dcdfc5 100644
--- a/arch/mips/kernel/genex.S
+++ b/arch/mips/kernel/genex.S
@@ -13,6 +13,7 @@
 #include <asm/asm.h>
 #include <asm/asmmacro.h>
 #include <asm/cacheops.h>
+#include <asm/irqflags.h>
 #include <asm/regdef.h>
 #include <asm/fpregdef.h>
 #include <asm/mipsregs.h>
@@ -128,6 +129,7 @@ handle_vcei:
 NESTED(handle_int, PT_SIZE, sp)
         SAVE_ALL
         CLI
+        TRACE_IRQS_OFF
 
         PTR_LA  ra, ret_from_irq
         move    a0, sp
@@ -216,6 +218,7 @@ NESTED(except_vec_vi_handler, 0, sp)
         _ehb
 #endif /* CONFIG_MIPS_MT_SMTC */
         CLI
+        TRACE_IRQS_OFF
         move    a0, sp
         jalr    v0
         j       ret_from_irq
@@ -288,11 +291,13 @@ NESTED(nmi_handler, PT_SIZE, sp)
         .endm
 
         .macro  __build_clear_sti
+        TRACE_IRQS_ON
         STI
         .endm
 
         .macro  __build_clear_cli
         CLI
+        TRACE_IRQS_OFF
         .endm
 
         .macro  __build_clear_fpe
@@ -300,6 +305,7 @@ NESTED(nmi_handler, PT_SIZE, sp)
         li      a2, ~(0x3f << 12)
         and     a2, a1
         ctc1    a2, fcr31
+        TRACE_IRQS_ON
         STI
         .endm
 
diff --git a/arch/mips/kernel/head.S b/arch/mips/kernel/head.S
index 476c1eb33c94..8c6db0fc72f0 100644
--- a/arch/mips/kernel/head.S
+++ b/arch/mips/kernel/head.S
@@ -5,7 +5,7 @@
  *
  * Copyright (C) 1994, 1995 Waldorf Electronics
  * Written by Ralf Baechle and Andreas Busse
- * Copyright (C) 1994, 95, 96, 97, 98, 99, 2003 Ralf Baechle
+ * Copyright (C) 1994 - 99, 2003, 06 Ralf Baechle
  * Copyright (C) 1996 Paul M. Antoine
  * Modified for DECStation and hence R3000 support by Paul M. Antoine
  * Further modifications by David S. Miller and Harald Koerfgen
@@ -18,6 +18,7 @@
 
 #include <asm/asm.h>
 #include <asm/asmmacro.h>
+#include <asm/irqflags.h>
 #include <asm/regdef.h>
 #include <asm/page.h>
 #include <asm/mipsregs.h>
diff --git a/arch/mips/kernel/scall32-o32.S b/arch/mips/kernel/scall32-o32.S
index c8e5f9c9a113..ba1bcd83c7d3 100644
--- a/arch/mips/kernel/scall32-o32.S
+++ b/arch/mips/kernel/scall32-o32.S
@@ -3,13 +3,14 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
- * Copyright (C) 1995, 96, 97, 98, 99, 2000, 01, 02 by Ralf Baechle
+ * Copyright (C) 1995-99, 2000- 02, 06 Ralf Baechle <ralf@linux-mips.org>
  * Copyright (C) 2001 MIPS Technologies, Inc.
  * Copyright (C) 2004 Thiemo Seufer
  */
 #include <linux/errno.h>
 #include <asm/asm.h>
 #include <asm/asmmacro.h>
+#include <asm/irqflags.h>
 #include <asm/mipsregs.h>
 #include <asm/regdef.h>
 #include <asm/stackframe.h>
@@ -27,6 +28,18 @@
 NESTED(handle_sys, PT_SIZE, sp)
         .set    noat
         SAVE_SOME
+#ifdef CONFIG_TRACE_IRQFLAGS
+        TRACE_IRQS_ON
+#ifdef CONFIG_64BIT
+        LONG_L  $8, PT_R8(sp)
+        LONG_L  $9, PT_R9(sp)
+#endif
+        LONG_L  $7, PT_R7(sp)
+        LONG_L  $6, PT_R6(sp)
+        LONG_L  $5, PT_R5(sp)
+        LONG_L  $4, PT_R4(sp)
+        LONG_L  $2, PT_R2(sp)
+#endif
         STI
         .set    at
 
diff --git a/arch/mips/kernel/scall64-64.S b/arch/mips/kernel/scall64-64.S
index 809fd1b55f84..939e172db953 100644
--- a/arch/mips/kernel/scall64-64.S
+++ b/arch/mips/kernel/scall64-64.S
@@ -10,6 +10,7 @@
 #include <linux/errno.h>
 #include <asm/asm.h>
 #include <asm/asmmacro.h>
+#include <asm/irqflags.h>
 #include <asm/mipsregs.h>
 #include <asm/regdef.h>
 #include <asm/stackframe.h>
@@ -33,6 +34,7 @@ NESTED(handle_sys64, PT_SIZE, sp)
          */
         .set    noat
         SAVE_SOME
+        TRACE_IRQS_ON
         STI
         .set    at
 #endif
diff --git a/arch/mips/kernel/scall64-n32.S b/arch/mips/kernel/scall64-n32.S
index b2b5cb9fe571..98abbc5a9f13 100644
--- a/arch/mips/kernel/scall64-n32.S
+++ b/arch/mips/kernel/scall64-n32.S
@@ -10,6 +10,7 @@
 #include <linux/errno.h>
 #include <asm/asm.h>
 #include <asm/asmmacro.h>
+#include <asm/irqflags.h>
 #include <asm/mipsregs.h>
 #include <asm/regdef.h>
 #include <asm/stackframe.h>
@@ -32,6 +33,7 @@ NESTED(handle_sysn32, PT_SIZE, sp)
 #ifndef CONFIG_MIPS32_O32
         .set    noat
         SAVE_SOME
+        TRACE_IRQS_ON
         STI
         .set    at
 #endif
diff --git a/arch/mips/kernel/scall64-o32.S b/arch/mips/kernel/scall64-o32.S
index 3a138dcc8827..505c9ee54009 100644
--- a/arch/mips/kernel/scall64-o32.S
+++ b/arch/mips/kernel/scall64-o32.S
@@ -16,6 +16,7 @@
 #include <linux/errno.h>
 #include <asm/asm.h>
 #include <asm/asmmacro.h>
+#include <asm/irqflags.h>
 #include <asm/mipsregs.h>
 #include <asm/regdef.h>
 #include <asm/stackframe.h>
@@ -27,6 +28,7 @@
 NESTED(handle_sys, PT_SIZE, sp)
         .set    noat
         SAVE_SOME
+        TRACE_IRQS_ON
         STI
         .set    at
         ld      t1, PT_EPC(sp)          # skip syscall on return
diff --git a/arch/mips/kernel/smtc-asm.S b/arch/mips/kernel/smtc-asm.S
index 72c6d98f8854..4cc3dea36612 100644
--- a/arch/mips/kernel/smtc-asm.S
+++ b/arch/mips/kernel/smtc-asm.S
@@ -96,6 +96,7 @@ FEXPORT(__smtc_ipi_vector)
         /* Save all will redundantly recompute the SP, but use it for now */
         SAVE_ALL
         CLI
+        TRACE_IRQS_OFF
         move    a0,sp
         /* Function to be invoked passed stack pad slot 5 */
         lw      t0,PT_PADSLOT5(sp)