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126 lines
3.3 KiB
C
126 lines
3.3 KiB
C
/*
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* Traps/Non-MMU Exception handling for ARC
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*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Rahul Trivedi: Codito Technologies 2004
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*/
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#include <linux/sched.h>
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#include <linux/kdebug.h>
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#include <linux/uaccess.h>
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#include <asm/ptrace.h>
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#include <asm/setup.h>
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void __init trap_init(void)
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{
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return;
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}
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void die(const char *str, struct pt_regs *regs, unsigned long address,
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unsigned long cause_reg)
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{
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show_kernel_fault_diag(str, regs, address, cause_reg);
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/* DEAD END */
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__asm__("flag 1");
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}
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/*
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* Helper called for bulk of exceptions NOT needing specific handling
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* -for user faults enqueues requested signal
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* -for kernel, chk if due to copy_(to|from)_user, otherwise die()
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*/
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static noinline int handle_exception(unsigned long cause, char *str,
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struct pt_regs *regs, siginfo_t *info)
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{
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if (user_mode(regs)) {
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struct task_struct *tsk = current;
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tsk->thread.fault_address = (__force unsigned int)info->si_addr;
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tsk->thread.cause_code = cause;
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force_sig_info(info->si_signo, info, tsk);
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} else {
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/* If not due to copy_(to|from)_user, we are doomed */
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if (fixup_exception(regs))
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return 0;
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die(str, regs, (unsigned long)info->si_addr, cause);
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}
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return 1;
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}
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#define DO_ERROR_INFO(signr, str, name, sicode) \
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int name(unsigned long cause, unsigned long address, struct pt_regs *regs) \
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{ \
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siginfo_t info = { \
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.si_signo = signr, \
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.si_errno = 0, \
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.si_code = sicode, \
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.si_addr = (void __user *)address, \
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}; \
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return handle_exception(cause, str, regs, &info);\
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}
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/*
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* Entry points for exceptions NOT needing specific handling
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*/
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DO_ERROR_INFO(SIGILL, "Priv Op/Disabled Extn", do_privilege_fault, ILL_PRVOPC)
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DO_ERROR_INFO(SIGILL, "Invalid Extn Insn", do_extension_fault, ILL_ILLOPC)
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DO_ERROR_INFO(SIGILL, "Illegal Insn (or Seq)", insterror_is_error, ILL_ILLOPC)
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DO_ERROR_INFO(SIGBUS, "Invalid Mem Access", do_memory_error, BUS_ADRERR)
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DO_ERROR_INFO(SIGTRAP, "Breakpoint Set", trap_is_brkpt, TRAP_BRKPT)
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DO_ERROR_INFO(SIGSEGV, "Misaligned Access", do_misaligned_access, SEGV_ACCERR)
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/*
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* Entry point for miscll errors such as Nested Exceptions
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* -Duplicate TLB entry is handled seperately though
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*/
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void do_machine_check_fault(unsigned long cause, unsigned long address,
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struct pt_regs *regs)
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{
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die("Machine Check Exception", regs, address, cause);
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}
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/*
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* Entry point for traps induced by ARCompact TRAP_S <n> insn
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* This is same family as TRAP0/SWI insn (use the same vector).
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* The only difference being SWI insn take no operand, while TRAP_S does
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* which reflects in ECR Reg as 8 bit param.
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* Thus TRAP_S <n> can be used for specific purpose
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* -1 used for software breakpointing (gdb)
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* -2 used by kprobes
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*/
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void do_non_swi_trap(unsigned long cause, unsigned long address,
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struct pt_regs *regs)
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{
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unsigned int param = cause & 0xff;
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switch (param) {
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case 1:
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trap_is_brkpt(cause, address, regs);
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break;
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default:
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break;
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}
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}
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/*
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* Entry point for Instruction Error Exception
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*/
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void do_insterror_or_kprobe(unsigned long cause,
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unsigned long address,
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struct pt_regs *regs)
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{
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insterror_is_error(cause, address, regs);
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}
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