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    Subject[PATCH 22/27] Blackfin: add preliminary support for STACKTRACE
    Date
    Signed-off-by: Mike Frysinger <vapier@gentoo.org>
    ---
    arch/blackfin/Kconfig | 3 ++
    arch/blackfin/kernel/Makefile | 1 +
    arch/blackfin/kernel/stacktrace.c | 53 +++++++++++++++++++++++++++++++++++++
    3 files changed, 57 insertions(+), 0 deletions(-)
    create mode 100644 arch/blackfin/kernel/stacktrace.c

    diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
    index d68cb0d..77ec14f 100644
    --- a/arch/blackfin/Kconfig
    +++ b/arch/blackfin/Kconfig
    @@ -55,6 +55,9 @@ config FORCE_MAX_ZONEORDER
    config GENERIC_CALIBRATE_DELAY
    def_bool y

    +config STACKTRACE_SUPPORT
    + def_bool y
    +
    config TRACE_IRQFLAGS_SUPPORT
    def_bool y

    diff --git a/arch/blackfin/kernel/Makefile b/arch/blackfin/kernel/Makefile
    index fd4d432..a66dda4 100644
    --- a/arch/blackfin/kernel/Makefile
    +++ b/arch/blackfin/kernel/Makefile
    @@ -23,6 +23,7 @@ obj-$(CONFIG_MODULES) += module.o
    obj-$(CONFIG_KGDB) += kgdb.o
    obj-$(CONFIG_KGDB_TESTS) += kgdb_test.o
    obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
    +obj-$(CONFIG_STACKTRACE) += stacktrace.o

    # the kgdb test puts code into L2 and without linker
    # relaxation, we need to force long calls to/from it
    diff --git a/arch/blackfin/kernel/stacktrace.c b/arch/blackfin/kernel/stacktrace.c
    new file mode 100644
    index 0000000..30301e1
    --- /dev/null
    +++ b/arch/blackfin/kernel/stacktrace.c
    @@ -0,0 +1,53 @@
    +/*
    + * Blackfin stacktrace code (mostly copied from avr32)
    + *
    + * Copyright 2009 Analog Devices Inc.
    + * Licensed under the GPL-2 or later.
    + */
    +
    +#include <linux/sched.h>
    +#include <linux/stacktrace.h>
    +#include <linux/thread_info.h>
    +#include <linux/module.h>
    +
    +register unsigned long current_frame_pointer asm("FP");
    +
    +struct stackframe {
    + unsigned long fp;
    + unsigned long rets;
    +};
    +
    +/*
    + * Save stack-backtrace addresses into a stack_trace buffer.
    + */
    +void save_stack_trace(struct stack_trace *trace)
    +{
    + unsigned long low, high;
    + unsigned long fp;
    + struct stackframe *frame;
    + int skip = trace->skip;
    +
    + low = (unsigned long)task_stack_page(current);
    + high = low + THREAD_SIZE;
    + fp = current_frame_pointer;
    +
    + while (fp >= low && fp <= (high - sizeof(*frame))) {
    + frame = (struct stackframe *)fp;
    +
    + if (skip) {
    + skip--;
    + } else {
    + trace->entries[trace->nr_entries++] = frame->rets;
    + if (trace->nr_entries >= trace->max_entries)
    + break;
    + }
    +
    + /*
    + * The next frame must be at a higher address than the
    + * current frame.
    + */
    + low = fp + sizeof(*frame);
    + fp = frame->fp;
    + }
    +}
    +EXPORT_SYMBOL_GPL(save_stack_trace);
    --
    1.6.3.1


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