projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 054419ed VG |
1 | /* |
| 2 | * Traps/Non-MMU Exception handling for ARC | |
| 3 | * | |
| 4 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * Rahul Trivedi: Codito Technologies 2004 | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/sched.h> | |
| 14 | #include <linux/kdebug.h> | |
| 15 | #include <linux/uaccess.h> | |
| 16 | #include <asm/ptrace.h> | |
| 17 | #include <asm/setup.h> | |
| 18 | ||
| 19 | void __init trap_init(void) | |
| 20 | { | |
| 21 | return; | |
| 22 | } | |
| 23 | ||
| 24 | void die(const char *str, struct pt_regs *regs, unsigned long address, | |
| 25 | unsigned long cause_reg) | |
| 26 | { | |
| 27 | show_kernel_fault_diag(str, regs, address, cause_reg); | |
| 28 | ||
| 29 | /* DEAD END */ | |
| 30 | __asm__("flag 1"); | |
| 31 | } | |
| 32 | ||
| 33 | /* | |
| 34 | * Helper called for bulk of exceptions NOT needing specific handling | |
| 35 | * -for user faults enqueues requested signal | |
| 36 | * -for kernel, chk if due to copy_(to|from)_user, otherwise die() | |
| 37 | */ | |
| 38 | static noinline int handle_exception(unsigned long cause, char *str, | |
| 39 | struct pt_regs *regs, siginfo_t *info) | |
| 40 | { | |
| 41 | if (user_mode(regs)) { | |
| 42 | struct task_struct *tsk = current; | |
| 43 | ||
| 44 | tsk->thread.fault_address = (__force unsigned int)info->si_addr; | |
| 45 | tsk->thread.cause_code = cause; | |
| 46 | ||
| 47 | force_sig_info(info->si_signo, info, tsk); | |
| 48 | ||
| 49 | } else { | |
| 50 | /* If not due to copy_(to|from)_user, we are doomed */ | |
| 51 | if (fixup_exception(regs)) | |
| 52 | return 0; | |
| 53 | ||
| 54 | die(str, regs, (unsigned long)info->si_addr, cause); | |
| 55 | } | |
| 56 | ||
| 57 | return 1; | |
| 58 | } | |
| 59 | ||
| 60 | #define DO_ERROR_INFO(signr, str, name, sicode) \ | |
| 61 | int name(unsigned long cause, unsigned long address, struct pt_regs *regs) \ | |
| 62 | { \ | |
| 63 | siginfo_t info = { \ | |
| 64 | .si_signo = signr, \ | |
| 65 | .si_errno = 0, \ | |
| 66 | .si_code = sicode, \ | |
| 67 | .si_addr = (void __user *)address, \ | |
| 68 | }; \ | |
| 69 | return handle_exception(cause, str, regs, &info);\ | |
| 70 | } | |
| 71 | ||
| 72 | /* | |
| 73 | * Entry points for exceptions NOT needing specific handling | |
| 74 | */ | |
| 75 | DO_ERROR_INFO(SIGILL, "Priv Op/Disabled Extn", do_privilege_fault, ILL_PRVOPC) | |
| 76 | DO_ERROR_INFO(SIGILL, "Invalid Extn Insn", do_extension_fault, ILL_ILLOPC) | |
| 77 | DO_ERROR_INFO(SIGILL, "Illegal Insn (or Seq)", insterror_is_error, ILL_ILLOPC) | |
| 78 | DO_ERROR_INFO(SIGBUS, "Invalid Mem Access", do_memory_error, BUS_ADRERR) | |
| 79 | DO_ERROR_INFO(SIGTRAP, "Breakpoint Set", trap_is_brkpt, TRAP_BRKPT) | |
| 80 | ||
| 81 | DO_ERROR_INFO(SIGSEGV, "Misaligned Access", do_misaligned_access, SEGV_ACCERR) | |
| 82 | ||
| 83 | /* | |
| 84 | * Entry point for miscll errors such as Nested Exceptions | |
| 85 | * -Duplicate TLB entry is handled seperately though | |
| 86 | */ | |
| 87 | void do_machine_check_fault(unsigned long cause, unsigned long address, | |
| 88 | struct pt_regs *regs) | |
| 89 | { | |
| 90 | die("Machine Check Exception", regs, address, cause); | |
| 91 | } | |
| 92 | ||
| 93 | /* | |
| 94 | * Entry point for traps induced by ARCompact TRAP_S <n> insn | |
| 95 | * This is same family as TRAP0/SWI insn (use the same vector). | |
| 96 | * The only difference being SWI insn take no operand, while TRAP_S does | |
| 97 | * which reflects in ECR Reg as 8 bit param. | |
| 98 | * Thus TRAP_S <n> can be used for specific purpose | |
| 99 | * -1 used for software breakpointing (gdb) | |
| 100 | * -2 used by kprobes | |
| 101 | */ | |
| 102 | void do_non_swi_trap(unsigned long cause, unsigned long address, | |
| 103 | struct pt_regs *regs) | |
| 104 | { | |
| 105 | unsigned int param = cause & 0xff; | |
| 106 | ||
| 107 | switch (param) { | |
| 108 | case 1: | |
| 109 | trap_is_brkpt(cause, address, regs); | |
| 110 | break; | |
| 111 | ||
| 112 | default: | |
| 113 | break; | |
| 114 | } | |
| 115 | } | |
| 116 | ||
| 117 | /* | |
| 118 | * Entry point for Instruction Error Exception | |
| 119 | */ | |
| 120 | void do_insterror_or_kprobe(unsigned long cause, | |
| 121 | unsigned long address, | |
| 122 | struct pt_regs *regs) | |
| 123 | { | |
| 124 | insterror_is_error(cause, address, regs); | |
| 125 | } |