ARC: Non-MMU Exception Handling

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

1 files changed, 125 insertions, 0 deletions

diff --git a/arch/arc/kernel/traps.c b/arch/arc/kernel/traps.c
new file mode 100644
index 000000000000..fd2457cec226
--- /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);
+}