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    Subject[PATCH v3 35/71] ARC: Last bits (stubs) to get to a running kernel with UART
    Date
    This was part of port buildup strategy from Arnd to have a minimal kernel
    at first and then add optional features (stacktracing, ptrace, smp,
    kprobes, oprofile....)

    Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
    ---
    arch/arc/kernel/ptrace.c | 26 ++++++++++++++++++++++++
    arch/arc/kernel/stacktrace.c | 43 ++++++++++++++++++++++++++++++++++++++++
    arch/arc/kernel/troubleshoot.c | 17 +++++++++++++++
    3 files changed, 86 insertions(+), 0 deletions(-)
    create mode 100644 arch/arc/kernel/ptrace.c
    create mode 100644 arch/arc/kernel/stacktrace.c
    create mode 100644 arch/arc/kernel/troubleshoot.c

    diff --git a/arch/arc/kernel/ptrace.c b/arch/arc/kernel/ptrace.c
    new file mode 100644
    index 0000000..1cf944a
    --- /dev/null
    +++ b/arch/arc/kernel/ptrace.c
    @@ -0,0 +1,26 @@
    +/*
    + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License version 2 as
    + * published by the Free Software Foundation.
    + */
    +
    +#include <linux/ptrace.h>
    +
    +void ptrace_disable(struct task_struct *child)
    +{
    +}
    +
    +long arch_ptrace(struct task_struct *child, long request,
    + unsigned long addr, unsigned long data)
    +{
    + int ret = -EIO;
    + return ret;
    +}
    +
    +
    +const struct user_regset_view *task_user_regset_view(struct task_struct *task)
    +{
    + return (const struct user_regset_view *)NULL;
    +}
    diff --git a/arch/arc/kernel/stacktrace.c b/arch/arc/kernel/stacktrace.c
    new file mode 100644
    index 0000000..b9d1646
    --- /dev/null
    +++ b/arch/arc/kernel/stacktrace.c
    @@ -0,0 +1,43 @@
    +/*
    + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License version 2 as
    + * published by the Free Software Foundation.
    + */
    +
    +#include <linux/ptrace.h>
    +#include <linux/export.h>
    +
    +/*-------------------------------------------------------------------------
    + * APIs expected by various kernel sub-systems
    + *-------------------------------------------------------------------------
    + */
    +
    +noinline void show_stacktrace(struct task_struct *tsk, struct pt_regs *regs)
    +{
    + pr_info("\nStack Trace: NOT Available\n");
    +}
    +EXPORT_SYMBOL(show_stacktrace);
    +
    +/* Expected by sched Code */
    +void show_stack(struct task_struct *tsk, unsigned long *sp)
    +{
    + show_stacktrace(tsk, NULL);
    +}
    +
    +/* Expected by Rest of kernel code */
    +void dump_stack(void)
    +{
    + show_stacktrace(NULL, NULL);
    +}
    +EXPORT_SYMBOL(dump_stack);
    +
    +/* Another API expected by schedular, shows up in "ps" as Wait Channel
    + * Ofcourse just returning schedule( ) would be pointless so unwind until
    + * the function is not in schedular code
    + */
    +unsigned int get_wchan(struct task_struct *tsk)
    +{
    + return 0;
    +}
    diff --git a/arch/arc/kernel/troubleshoot.c b/arch/arc/kernel/troubleshoot.c
    new file mode 100644
    index 0000000..80bfe2a
    --- /dev/null
    +++ b/arch/arc/kernel/troubleshoot.c
    @@ -0,0 +1,17 @@
    +/*
    + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License version 2 as
    + */
    +
    +#include <linux/ptrace.h>
    +
    +void show_regs(struct pt_regs *regs)
    +{
    +}
    +
    +void show_kernel_fault_diag(const char *str, struct pt_regs *regs,
    + unsigned long address, unsigned long cause_reg)
    +{
    +}
    --
    1.7.4.1


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