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    Subject[PATCH v2 15/76] ARC: Non-MMU Exception Handling
    Date
    Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
    ---
    arch/arc/include/asm/hw_irq.h | 7 --
    arch/arc/kernel/traps.c | 125 +++++++++++++++++++++++++++++++++++++++++
    2 files changed, 125 insertions(+), 7 deletions(-)
    delete mode 100644 arch/arc/include/asm/hw_irq.h
    create mode 100644 arch/arc/kernel/traps.c

    diff --git a/arch/arc/include/asm/hw_irq.h b/arch/arc/include/asm/hw_irq.h
    deleted file mode 100644
    index fd565ab..0000000
    --- a/arch/arc/include/asm/hw_irq.h
    +++ /dev/null
    @@ -1,7 +0,0 @@
    -/*
    - * 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.
    - */
    diff --git a/arch/arc/kernel/traps.c b/arch/arc/kernel/traps.c
    new file mode 100644
    index 0000000..fd2457c
    --- /dev/null
    +++ b/arch/arc/kernel/traps.c
    @@ -0,0 +1,125 @@
    +/*
    + * Traps/Non-MMU Exception handling for ARC
    + *
    + * 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.
    + *
    + * Rahul Trivedi: Codito Technologies 2004
    + */
    +
    +#include <linux/sched.h>
    +#include <linux/kdebug.h>
    +#include <linux/uaccess.h>
    +#include <asm/ptrace.h>
    +#include <asm/setup.h>
    +
    +void __init trap_init(void)
    +{
    + return;
    +}
    +
    +void die(const char *str, struct pt_regs *regs, unsigned long address,
    + unsigned long cause_reg)
    +{
    + show_kernel_fault_diag(str, regs, address, cause_reg);
    +
    + /* DEAD END */
    + __asm__("flag 1");
    +}
    +
    +/*
    + * Helper called for bulk of exceptions NOT needing specific handling
    + * -for user faults enqueues requested signal
    + * -for kernel, chk if due to copy_(to|from)_user, otherwise die()
    + */
    +static noinline int handle_exception(unsigned long cause, char *str,
    + struct pt_regs *regs, siginfo_t *info)
    +{
    + if (user_mode(regs)) {
    + struct task_struct *tsk = current;
    +
    + tsk->thread.fault_address = (__force unsigned int)info->si_addr;
    + tsk->thread.cause_code = cause;
    +
    + force_sig_info(info->si_signo, info, tsk);
    +
    + } else {
    + /* If not due to copy_(to|from)_user, we are doomed */
    + if (fixup_exception(regs))
    + return 0;
    +
    + die(str, regs, (unsigned long)info->si_addr, cause);
    + }
    +
    + return 1;
    +}
    +
    +#define DO_ERROR_INFO(signr, str, name, sicode) \
    +int name(unsigned long cause, unsigned long address, struct pt_regs *regs) \
    +{ \
    + siginfo_t info = { \
    + .si_signo = signr, \
    + .si_errno = 0, \
    + .si_code = sicode, \
    + .si_addr = (void __user *)address, \
    + }; \
    + return handle_exception(cause, str, regs, &info);\
    +}
    +
    +/*
    + * Entry points for exceptions NOT needing specific handling
    + */
    +DO_ERROR_INFO(SIGILL, "Priv Op/Disabled Extn", do_privilege_fault, ILL_PRVOPC)
    +DO_ERROR_INFO(SIGILL, "Invalid Extn Insn", do_extension_fault, ILL_ILLOPC)
    +DO_ERROR_INFO(SIGILL, "Illegal Insn (or Seq)", insterror_is_error, ILL_ILLOPC)
    +DO_ERROR_INFO(SIGBUS, "Invalid Mem Access", do_memory_error, BUS_ADRERR)
    +DO_ERROR_INFO(SIGTRAP, "Breakpoint Set", trap_is_brkpt, TRAP_BRKPT)
    +
    +DO_ERROR_INFO(SIGSEGV, "Misaligned Access", do_misaligned_access, SEGV_ACCERR)
    +
    +/*
    + * Entry point for miscll errors such as Nested Exceptions
    + * -Duplicate TLB entry is handled seperately though
    + */
    +void do_machine_check_fault(unsigned long cause, unsigned long address,
    + struct pt_regs *regs)
    +{
    + die("Machine Check Exception", regs, address, cause);
    +}
    +
    +/*
    + * Entry point for traps induced by ARCompact TRAP_S <n> insn
    + * This is same family as TRAP0/SWI insn (use the same vector).
    + * The only difference being SWI insn take no operand, while TRAP_S does
    + * which reflects in ECR Reg as 8 bit param.
    + * Thus TRAP_S <n> can be used for specific purpose
    + * -1 used for software breakpointing (gdb)
    + * -2 used by kprobes
    + */
    +void do_non_swi_trap(unsigned long cause, unsigned long address,
    + struct pt_regs *regs)
    +{
    + unsigned int param = cause & 0xff;
    +
    + switch (param) {
    + case 1:
    + trap_is_brkpt(cause, address, regs);
    + break;
    +
    + default:
    + break;
    + }
    +}
    +
    +/*
    + * Entry point for Instruction Error Exception
    + */
    +void do_insterror_or_kprobe(unsigned long cause,
    + unsigned long address,
    + struct pt_regs *regs)
    +{
    + insterror_is_error(cause, address, regs);
    +}
    --
    1.7.4.1


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