arch/powerpc/include/asm/irqflags.h

   1 /*
   2  * IRQ flags handling
   3  */
   4 #ifndef _ASM_IRQFLAGS_H
   5 #define _ASM_IRQFLAGS_H
   6
   7 #ifndef __ASSEMBLY__
   8 /*
   9  * Get definitions for arch_local_save_flags(x), etc.
  10  */
  11 #include <asm/hw_irq.h>
  12
  13 #else
  14 #ifdef CONFIG_TRACE_IRQFLAGS
  15 #ifdef CONFIG_IRQSOFF_TRACER
  16 /*
  17  * Since the ftrace irqsoff latency trace checks CALLER_ADDR1,
  18  * which is the stack frame here, we need to force a stack frame
  19  * in case we came from user space.
  20  */
  21 #define TRACE_WITH_FRAME_BUFFER(func)           \
  22         mflr    r0;                             \
  23         stdu    r1, -32(r1);                    \
  24         std     r0, 16(r1);                     \
  25         stdu    r1, -32(r1);                    \
  26         bl func;                                \
  27         ld      r1, 0(r1);                      \
  28         ld      r1, 0(r1);
  29 #else
  30 #define TRACE_WITH_FRAME_BUFFER(func)           \
  31         bl func;
  32 #endif
  33
  34 /*
  35  * Most of the CPU's IRQ-state tracing is done from assembly code; we
  36  * have to call a C function so call a wrapper that saves all the
  37  * C-clobbered registers.
  38  */
  39 #define TRACE_ENABLE_INTS       TRACE_WITH_FRAME_BUFFER(.trace_hardirqs_on)
  40 #define TRACE_DISABLE_INTS      TRACE_WITH_FRAME_BUFFER(.trace_hardirqs_off)
  41
  42 #define TRACE_AND_RESTORE_IRQ_PARTIAL(en,skip)          \
  43         cmpdi   en,0;                                   \
  44         bne     95f;                                    \
  45         stb     en,PACASOFTIRQEN(r13);                  \
  46         TRACE_WITH_FRAME_BUFFER(.trace_hardirqs_off)    \
  47         b       skip;                                   \
  48 95:     TRACE_WITH_FRAME_BUFFER(.trace_hardirqs_on)     \
  49         li      en,1;
  50 #define TRACE_AND_RESTORE_IRQ(en)               \
  51         TRACE_AND_RESTORE_IRQ_PARTIAL(en,96f);  \
  52         stb     en,PACASOFTIRQEN(r13);          \
  53 96:
  54 #else
  55 #define TRACE_ENABLE_INTS
  56 #define TRACE_DISABLE_INTS
  57 #define TRACE_AND_RESTORE_IRQ_PARTIAL(en,skip)
  58 #define TRACE_AND_RESTORE_IRQ(en)               \
  59         stb     en,PACASOFTIRQEN(r13)
  60 #endif
  61 #endif
  62
  63 #endif