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Linux/arch/arc/kernel/traps.c

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  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  * vineetg: May 2011
 11  *  -user-space unaligned access emulation
 12  *
 13  * Rahul Trivedi: Codito Technologies 2004
 14  */
 15 
 16 #include <linux/sched.h>
 17 #include <linux/kdebug.h>
 18 #include <linux/uaccess.h>
 19 #include <linux/ptrace.h>
 20 #include <linux/kprobes.h>
 21 #include <linux/kgdb.h>
 22 #include <asm/setup.h>
 23 #include <asm/unaligned.h>
 24 #include <asm/kprobes.h>
 25 
 26 void __init trap_init(void)
 27 {
 28         return;
 29 }
 30 
 31 void die(const char *str, struct pt_regs *regs, unsigned long address)
 32 {
 33         show_kernel_fault_diag(str, regs, address);
 34 
 35         /* DEAD END */
 36         __asm__("flag 1");
 37 }
 38 
 39 /*
 40  * Helper called for bulk of exceptions NOT needing specific handling
 41  *  -for user faults enqueues requested signal
 42  *  -for kernel, chk if due to copy_(to|from)_user, otherwise die()
 43  */
 44 static noinline int
 45 handle_exception(const char *str, struct pt_regs *regs, siginfo_t *info)
 46 {
 47         if (user_mode(regs)) {
 48                 struct task_struct *tsk = current;
 49 
 50                 tsk->thread.fault_address = (__force unsigned int)info->si_addr;
 51 
 52                 force_sig_info(info->si_signo, info, tsk);
 53 
 54         } else {
 55                 /* If not due to copy_(to|from)_user, we are doomed */
 56                 if (fixup_exception(regs))
 57                         return 0;
 58 
 59                 die(str, regs, (unsigned long)info->si_addr);
 60         }
 61 
 62         return 1;
 63 }
 64 
 65 #define DO_ERROR_INFO(signr, str, name, sicode) \
 66 int name(unsigned long address, struct pt_regs *regs) \
 67 {                                               \
 68         siginfo_t info = {                      \
 69                 .si_signo = signr,              \
 70                 .si_errno = 0,                  \
 71                 .si_code  = sicode,             \
 72                 .si_addr = (void __user *)address,      \
 73         };                                      \
 74         return handle_exception(str, regs, &info);\
 75 }
 76 
 77 /*
 78  * Entry points for exceptions NOT needing specific handling
 79  */
 80 DO_ERROR_INFO(SIGILL, "Priv Op/Disabled Extn", do_privilege_fault, ILL_PRVOPC)
 81 DO_ERROR_INFO(SIGILL, "Invalid Extn Insn", do_extension_fault, ILL_ILLOPC)
 82 DO_ERROR_INFO(SIGILL, "Illegal Insn (or Seq)", insterror_is_error, ILL_ILLOPC)
 83 DO_ERROR_INFO(SIGBUS, "Invalid Mem Access", do_memory_error, BUS_ADRERR)
 84 DO_ERROR_INFO(SIGTRAP, "Breakpoint Set", trap_is_brkpt, TRAP_BRKPT)
 85 DO_ERROR_INFO(SIGBUS, "Misaligned Access", do_misaligned_error, BUS_ADRALN)
 86 
 87 /*
 88  * Entry Point for Misaligned Data access Exception, for emulating in software
 89  */
 90 int do_misaligned_access(unsigned long address, struct pt_regs *regs,
 91                          struct callee_regs *cregs)
 92 {
 93         /* If emulation not enabled, or failed, kill the task */
 94         if (misaligned_fixup(address, regs, cregs) != 0)
 95                 return do_misaligned_error(address, regs);
 96 
 97         return 0;
 98 }
 99 
100 /*
101  * Entry point for miscll errors such as Nested Exceptions
102  *  -Duplicate TLB entry is handled seperately though
103  */
104 void do_machine_check_fault(unsigned long address, struct pt_regs *regs)
105 {
106         die("Machine Check Exception", regs, address);
107 }
108 
109 
110 /*
111  * Entry point for traps induced by ARCompact TRAP_S <n> insn
112  * This is same family as TRAP0/SWI insn (use the same vector).
113  * The only difference being SWI insn take no operand, while TRAP_S does
114  * which reflects in ECR Reg as 8 bit param.
115  * Thus TRAP_S <n> can be used for specific purpose
116  *  -1 used for software breakpointing (gdb)
117  *  -2 used by kprobes
118  */
119 void do_non_swi_trap(unsigned long address, struct pt_regs *regs)
120 {
121         unsigned int param = regs->ecr_param;
122 
123         switch (param) {
124         case 1:
125                 trap_is_brkpt(address, regs);
126                 break;
127 
128         case 2:
129                 trap_is_kprobe(address, regs);
130                 break;
131 
132         case 3:
133         case 4:
134                 kgdb_trap(regs);
135                 break;
136 
137         default:
138                 break;
139         }
140 }
141 
142 /*
143  * Entry point for Instruction Error Exception
144  *  -For a corner case, ARC kprobes implementation resorts to using
145  *   this exception, hence the check
146  */
147 void do_insterror_or_kprobe(unsigned long address, struct pt_regs *regs)
148 {
149         int rc;
150 
151         /* Check if this exception is caused by kprobes */
152         rc = notify_die(DIE_IERR, "kprobe_ierr", regs, address, 0, SIGILL);
153         if (rc == NOTIFY_STOP)
154                 return;
155 
156         insterror_is_error(address, regs);
157 }
158 

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