[PATCH 03/05] Linux Kernel Markers : powerpc optimization
Mathieu Desnoyers <[email protected]>
| Newsgroups | gmane.linux.systemtap,gmane.linux.kernel,gmane.linux.kernel.tracing |
|---|---|
| Message-ID | <[email protected]> |
Linux Kernel Markers : powerpc optimization Signed-off-by: Mathieu Desnoyers <[email protected]> --- /dev/null +++ b/include/asm-powerpc/marker.h @@ -0,0 +1,49 @@ +/* + * marker.h + * + * Code markup for dynamic and static tracing. PowerPC architecture + * optimisations. + * + * (C) Copyright 2006 Mathieu Desnoyers <[email protected]> + * + * This file is released under the GPLv2. + * See the file COPYING for more details. + */ + +#include <asm/asm-compat.h> + +#ifdef CONFIG_MARKERS + +#define MARK(name, format, args...) \ + do { \ + static marker_probe_func *__mark_call_##name = \ + __mark_empty_function; \ + static const struct __mark_marker_c __mark_c_##name \ + __attribute__((section(".markers.c"))) = \ + { #name, &__mark_call_##name, format, \ + MARKER_OPTIMIZED } ; \ + char condition; \ + asm volatile( ".section .markers, \"a\";\n\t" \ + PPC_LONG "%1, 0f;\n\t" \ + ".previous;\n\t" \ + ".align 4\n\t" \ + "0:\n\t" \ + "li %0,0;\n\t" \ + : "=r" (condition) \ + : "i" (&__mark_c_##name)); \ + __mark_check_format(format, ## args); \ + if (unlikely(condition)) { \ + preempt_disable(); \ + (*__mark_call_##name)(format, ## args); \ + preempt_enable(); \ + } \ + } while (0) + + +/* Offset of the immediate value from the start of the addi instruction (result + * of the li mnemonic), in bytes. */ +#define MARK_ENABLE_IMMEDIATE_OFFSET 2 +#define MARK_ENABLE_TYPE short +#define MARK_POLYMORPHIC + +#endif