[MIPS] TRACE_IRQFLAGS_SUPPORT support.
Ralf Baechle [Fri, 7 Jul 2006 13:07:18 +0000 (14:07 +0100)]
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

15 files changed:
arch/mips/Kconfig.debug
arch/mips/kernel/entry.S
arch/mips/kernel/gdb-low.S
arch/mips/kernel/genex.S
arch/mips/kernel/head.S
arch/mips/kernel/scall32-o32.S
arch/mips/kernel/scall64-64.S
arch/mips/kernel/scall64-n32.S
arch/mips/kernel/scall64-o32.S
arch/mips/kernel/smtc-asm.S
include/asm-mips/atomic.h
include/asm-mips/bitops.h
include/asm-mips/irqflags.h [moved from include/asm-mips/interrupt.h with 80% similarity]
include/asm-mips/mipsregs.h
include/asm-mips/system.h

index 515f9e6..5d6afb5 100644 (file)
@@ -1,5 +1,9 @@
 menu "Kernel hacking"
 
+config TRACE_IRQFLAGS_SUPPORT
+       bool
+       default y
+
 source "lib/Kconfig.debug"
 
 config CROSSCOMPILE
index 01e7fa8..766655f 100644 (file)
@@ -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
index 666bc90..2c44606 100644 (file)
@@ -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>
                LONG_S  $31, GDB_FR_REG31(sp)
 
                CLI                             /* disable interrupts */
+               TRACE_IRQS_OFF
 
 /*
  * Followed by the floating point registers
index b563811..37fda3d 100644 (file)
@@ -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
 
index 476c1eb..8c6db0f 100644 (file)
@@ -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>
index c8e5f9c..ba1bcd8 100644 (file)
@@ -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>
 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
 
index 809fd1b..939e172 100644 (file)
@@ -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
index b2b5cb9..98abbc5 100644 (file)
@@ -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
index 3a138dc..505c9ee 100644 (file)
@@ -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
index 72c6d98..4cc3dea 100644 (file)
@@ -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)
index 13d44e1..e64abc0 100644 (file)
@@ -22,8 +22,8 @@
 #ifndef _ASM_ATOMIC_H
 #define _ASM_ATOMIC_H
 
+#include <linux/irqflags.h>
 #include <asm/cpu-features.h>
-#include <asm/interrupt.h>
 #include <asm/war.h>
 
 typedef struct { volatile int counter; } atomic_t;
index 098cec2..1bb89c5 100644 (file)
@@ -31,7 +31,7 @@
 
 #ifdef __KERNEL__
 
-#include <asm/interrupt.h>
+#include <linux/irqflags.h>
 #include <asm/sgidefs.h>
 #include <asm/war.h>
 
similarity index 80%
rename from include/asm-mips/interrupt.h
rename to include/asm-mips/irqflags.h
index a99d686..43ca09a 100644 (file)
@@ -8,13 +8,15 @@
  * Copyright (C) 1999 Silicon Graphics
  * Copyright (C) 2000 MIPS Technologies, Inc.
  */
-#ifndef _ASM_INTERRUPT_H
-#define _ASM_INTERRUPT_H
+#ifndef _ASM_IRQFLAGS_H
+#define _ASM_IRQFLAGS_H
+
+#ifndef __ASSEMBLY__
 
 #include <asm/hazards.h>
 
 __asm__ (
-       "       .macro  local_irq_enable                                \n"
+       "       .macro  raw_local_irq_enable                            \n"
        "       .set    push                                            \n"
        "       .set    reorder                                         \n"
        "       .set    noat                                            \n"
@@ -35,10 +37,10 @@ __asm__ (
        "       .set    pop                                             \n"
        "       .endm");
 
-static inline void local_irq_enable(void)
+static inline void raw_local_irq_enable(void)
 {
        __asm__ __volatile__(
-               "local_irq_enable"
+               "raw_local_irq_enable"
                : /* no outputs */
                : /* no inputs */
                : "memory");
@@ -63,7 +65,7 @@ static inline void local_irq_enable(void)
  * Workaround: mask EXL bit of the result or place a nop before mfc0.
  */
 __asm__ (
-       "       .macro  local_irq_disable\n"
+       "       .macro  raw_local_irq_disable\n"
        "       .set    push                                            \n"
        "       .set    noat                                            \n"
 #ifdef CONFIG_MIPS_MT_SMTC
@@ -84,17 +86,17 @@ __asm__ (
        "       .set    pop                                             \n"
        "       .endm                                                   \n");
 
-static inline void local_irq_disable(void)
+static inline void raw_local_irq_disable(void)
 {
        __asm__ __volatile__(
-               "local_irq_disable"
+               "raw_local_irq_disable"
                : /* no outputs */
                : /* no inputs */
                : "memory");
 }
 
 __asm__ (
-       "       .macro  local_save_flags flags                          \n"
+       "       .macro  raw_local_save_flags flags                      \n"
        "       .set    push                                            \n"
        "       .set    reorder                                         \n"
 #ifdef CONFIG_MIPS_MT_SMTC
@@ -105,13 +107,13 @@ __asm__ (
        "       .set    pop                                             \n"
        "       .endm                                                   \n");
 
-#define local_save_flags(x)                                            \
+#define raw_local_save_flags(x)                                                \
 __asm__ __volatile__(                                                  \
-       "local_save_flags %0"                                           \
+       "raw_local_save_flags %0"                                       \
        : "=r" (x))
 
 __asm__ (
-       "       .macro  local_irq_save result                           \n"
+       "       .macro  raw_local_irq_save result                       \n"
        "       .set    push                                            \n"
        "       .set    reorder                                         \n"
        "       .set    noat                                            \n"
@@ -135,15 +137,15 @@ __asm__ (
        "       .set    pop                                             \n"
        "       .endm                                                   \n");
 
-#define local_irq_save(x)                                              \
+#define raw_local_irq_save(x)                                          \
 __asm__ __volatile__(                                                  \
-       "local_irq_save\t%0"                                            \
+       "raw_local_irq_save\t%0"                                        \
        : "=r" (x)                                                      \
        : /* no inputs */                                               \
        : "memory")
 
 __asm__ (
-       "       .macro  local_irq_restore flags                         \n"
+       "       .macro  raw_local_irq_restore flags                     \n"
        "       .set    push                                            \n"
        "       .set    noreorder                                       \n"
        "       .set    noat                                            \n"
@@ -182,40 +184,42 @@ __asm__ (
        "       .set    pop                                             \n"
        "       .endm                                                   \n");
 
-#define local_irq_restore(flags)                                       \
+#define raw_local_irq_restore(flags)                                   \
 do {                                                                   \
        unsigned long __tmp1;                                           \
                                                                        \
        __asm__ __volatile__(                                           \
-               "local_irq_restore\t%0"                                 \
+               "raw_local_irq_restore\t%0"                             \
                : "=r" (__tmp1)                                         \
                : "0" (flags)                                           \
                : "memory");                                            \
 } while(0)
 
-static inline int irqs_disabled(void)
+static inline int raw_irqs_disabled_flags(unsigned long flags)
 {
 #ifdef CONFIG_MIPS_MT_SMTC
        /*
         * SMTC model uses TCStatus.IXMT to disable interrupts for a thread/CPU
         */
-       unsigned long __result;
-
-       __asm__ __volatile__(
-       "       .set    noreorder                                       \n"
-       "       mfc0    %0, $2, 1                                       \n"
-       "       andi    %0, 0x400                                       \n"
-       "       slt     %0, $0, %0                                      \n"
-       "       .set    reorder                                         \n"
-       : "=r" (__result));
-
-       return __result;
+       return flags & 0x400;
 #else
-       unsigned long flags;
-       local_save_flags(flags);
-
        return !(flags & 1);
 #endif
 }
 
-#endif /* _ASM_INTERRUPT_H */
+#endif
+
+/*
+ * Do the CPU's IRQ-state tracing from assembly code.
+ */
+#ifdef CONFIG_TRACE_IRQFLAGS
+# define TRACE_IRQS_ON                                                 \
+       jal     trace_hardirqs_on
+# define TRACE_IRQS_OFF                                                        \
+       jal     trace_hardirqs_off
+#else
+# define TRACE_IRQS_ON
+# define TRACE_IRQS_OFF
+#endif
+
+#endif /* _ASM_IRQFLAGS_H */
index b4169f0..6776688 100644 (file)
@@ -1417,7 +1417,7 @@ change_c0_##name(unsigned int change, unsigned int new)           \
 
 #else /* SMTC versions that manage MT scheduling */
 
-#include <asm/interrupt.h>
+#include <linux/irqflags.h>
 
 /*
  * This is a duplicate of dmt() in mipsmtregs.h to avoid problems with
index 130333d..13c98dd 100644 (file)
 #define _ASM_SYSTEM_H
 
 #include <linux/types.h>
+#include <linux/irqflags.h>
 
 #include <asm/addrspace.h>
 #include <asm/cpu-features.h>
 #include <asm/dsp.h>
 #include <asm/ptrace.h>
 #include <asm/war.h>
-#include <asm/interrupt.h>
 
 /*
  * read_barrier_depends - Flush all pending reads that subsequents reads