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-rw-r--r--arch/c6x/kernel/traps.c423
1 files changed, 423 insertions, 0 deletions
diff --git a/arch/c6x/kernel/traps.c b/arch/c6x/kernel/traps.c
new file mode 100644
index 00000000000..f50e3edd6da
--- /dev/null
+++ b/arch/c6x/kernel/traps.c
@@ -0,0 +1,423 @@
+/*
+ * Port on Texas Instruments TMS320C6x architecture
+ *
+ * Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
+ * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.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.
+ */
+#include <linux/module.h>
+#include <linux/ptrace.h>
+#include <linux/kallsyms.h>
+#include <linux/bug.h>
+
+#include <asm/soc.h>
+#include <asm/traps.h>
+
+int (*c6x_nmi_handler)(struct pt_regs *regs);
+
+void __init trap_init(void)
+{
+ ack_exception(EXCEPT_TYPE_NXF);
+ ack_exception(EXCEPT_TYPE_EXC);
+ ack_exception(EXCEPT_TYPE_IXF);
+ ack_exception(EXCEPT_TYPE_SXF);
+ enable_exception();
+}
+
+void show_regs(struct pt_regs *regs)
+{
+ pr_err("\n");
+ pr_err("PC: %08lx SP: %08lx\n", regs->pc, regs->sp);
+ pr_err("Status: %08lx ORIG_A4: %08lx\n", regs->csr, regs->orig_a4);
+ pr_err("A0: %08lx B0: %08lx\n", regs->a0, regs->b0);
+ pr_err("A1: %08lx B1: %08lx\n", regs->a1, regs->b1);
+ pr_err("A2: %08lx B2: %08lx\n", regs->a2, regs->b2);
+ pr_err("A3: %08lx B3: %08lx\n", regs->a3, regs->b3);
+ pr_err("A4: %08lx B4: %08lx\n", regs->a4, regs->b4);
+ pr_err("A5: %08lx B5: %08lx\n", regs->a5, regs->b5);
+ pr_err("A6: %08lx B6: %08lx\n", regs->a6, regs->b6);
+ pr_err("A7: %08lx B7: %08lx\n", regs->a7, regs->b7);
+ pr_err("A8: %08lx B8: %08lx\n", regs->a8, regs->b8);
+ pr_err("A9: %08lx B9: %08lx\n", regs->a9, regs->b9);
+ pr_err("A10: %08lx B10: %08lx\n", regs->a10, regs->b10);
+ pr_err("A11: %08lx B11: %08lx\n", regs->a11, regs->b11);
+ pr_err("A12: %08lx B12: %08lx\n", regs->a12, regs->b12);
+ pr_err("A13: %08lx B13: %08lx\n", regs->a13, regs->b13);
+ pr_err("A14: %08lx B14: %08lx\n", regs->a14, regs->dp);
+ pr_err("A15: %08lx B15: %08lx\n", regs->a15, regs->sp);
+ pr_err("A16: %08lx B16: %08lx\n", regs->a16, regs->b16);
+ pr_err("A17: %08lx B17: %08lx\n", regs->a17, regs->b17);
+ pr_err("A18: %08lx B18: %08lx\n", regs->a18, regs->b18);
+ pr_err("A19: %08lx B19: %08lx\n", regs->a19, regs->b19);
+ pr_err("A20: %08lx B20: %08lx\n", regs->a20, regs->b20);
+ pr_err("A21: %08lx B21: %08lx\n", regs->a21, regs->b21);
+ pr_err("A22: %08lx B22: %08lx\n", regs->a22, regs->b22);
+ pr_err("A23: %08lx B23: %08lx\n", regs->a23, regs->b23);
+ pr_err("A24: %08lx B24: %08lx\n", regs->a24, regs->b24);
+ pr_err("A25: %08lx B25: %08lx\n", regs->a25, regs->b25);
+ pr_err("A26: %08lx B26: %08lx\n", regs->a26, regs->b26);
+ pr_err("A27: %08lx B27: %08lx\n", regs->a27, regs->b27);
+ pr_err("A28: %08lx B28: %08lx\n", regs->a28, regs->b28);
+ pr_err("A29: %08lx B29: %08lx\n", regs->a29, regs->b29);
+ pr_err("A30: %08lx B30: %08lx\n", regs->a30, regs->b30);
+ pr_err("A31: %08lx B31: %08lx\n", regs->a31, regs->b31);
+}
+
+void dump_stack(void)
+{
+ unsigned long stack;
+
+ show_stack(current, &stack);
+}
+EXPORT_SYMBOL(dump_stack);
+
+
+void die(char *str, struct pt_regs *fp, int nr)
+{
+ console_verbose();
+ pr_err("%s: %08x\n", str, nr);
+ show_regs(fp);
+
+ pr_err("Process %s (pid: %d, stackpage=%08lx)\n",
+ current->comm, current->pid, (PAGE_SIZE +
+ (unsigned long) current));
+
+ dump_stack();
+ while (1)
+ ;
+}
+
+static void die_if_kernel(char *str, struct pt_regs *fp, int nr)
+{
+ if (user_mode(fp))
+ return;
+
+ die(str, fp, nr);
+}
+
+
+/* Internal exceptions */
+static struct exception_info iexcept_table[10] = {
+ { "Oops - instruction fetch", SIGBUS, BUS_ADRERR },
+ { "Oops - fetch packet", SIGBUS, BUS_ADRERR },
+ { "Oops - execute packet", SIGILL, ILL_ILLOPC },
+ { "Oops - undefined instruction", SIGILL, ILL_ILLOPC },
+ { "Oops - resource conflict", SIGILL, ILL_ILLOPC },
+ { "Oops - resource access", SIGILL, ILL_PRVREG },
+ { "Oops - privilege", SIGILL, ILL_PRVOPC },
+ { "Oops - loops buffer", SIGILL, ILL_ILLOPC },
+ { "Oops - software exception", SIGILL, ILL_ILLTRP },
+ { "Oops - unknown exception", SIGILL, ILL_ILLOPC }
+};
+
+/* External exceptions */
+static struct exception_info eexcept_table[128] = {
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - external exception", SIGBUS, BUS_ADRERR },
+ { "Oops - CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
+ { "Oops - CPU memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
+ { "Oops - DMA memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
+ { "Oops - CPU memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
+ { "Oops - DMA memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
+ { "Oops - CPU memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
+ { "Oops - DMA memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
+ { "Oops - EMC CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
+ { "Oops - EMC bus error", SIGBUS, BUS_ADRERR }
+};
+
+static void do_trap(struct exception_info *except_info, struct pt_regs *regs)
+{
+ unsigned long addr = instruction_pointer(regs);
+ siginfo_t info;
+
+ if (except_info->code != TRAP_BRKPT)
+ pr_err("TRAP: %s PC[0x%lx] signo[%d] code[%d]\n",
+ except_info->kernel_str, regs->pc,
+ except_info->signo, except_info->code);
+
+ die_if_kernel(except_info->kernel_str, regs, addr);
+
+ info.si_signo = except_info->signo;
+ info.si_errno = 0;
+ info.si_code = except_info->code;
+ info.si_addr = (void __user *)addr;
+
+ force_sig_info(except_info->signo, &info, current);
+}
+
+/*
+ * Process an internal exception (non maskable)
+ */
+static int process_iexcept(struct pt_regs *regs)
+{
+ unsigned int iexcept_report = get_iexcept();
+ unsigned int iexcept_num;
+
+ ack_exception(EXCEPT_TYPE_IXF);
+
+ pr_err("IEXCEPT: PC[0x%lx]\n", regs->pc);
+
+ while (iexcept_report) {
+ iexcept_num = __ffs(iexcept_report);
+ iexcept_report &= ~(1 << iexcept_num);
+ set_iexcept(iexcept_report);
+ if (*(unsigned int *)regs->pc == BKPT_OPCODE) {
+ /* This is a breakpoint */
+ struct exception_info bkpt_exception = {
+ "Oops - undefined instruction",
+ SIGTRAP, TRAP_BRKPT
+ };
+ do_trap(&bkpt_exception, regs);
+ iexcept_report &= ~(0xFF);
+ set_iexcept(iexcept_report);
+ continue;
+ }
+
+ do_trap(&iexcept_table[iexcept_num], regs);
+ }
+ return 0;
+}
+
+/*
+ * Process an external exception (maskable)
+ */
+static void process_eexcept(struct pt_regs *regs)
+{
+ int evt;
+
+ pr_err("EEXCEPT: PC[0x%lx]\n", regs->pc);
+
+ while ((evt = soc_get_exception()) >= 0)
+ do_trap(&eexcept_table[evt], regs);
+
+ ack_exception(EXCEPT_TYPE_EXC);
+}
+
+/*
+ * Main exception processing
+ */
+asmlinkage int process_exception(struct pt_regs *regs)
+{
+ unsigned int type;
+ unsigned int type_num;
+ unsigned int ie_num = 9; /* default is unknown exception */
+
+ while ((type = get_except_type()) != 0) {
+ type_num = fls(type) - 1;
+
+ switch (type_num) {
+ case EXCEPT_TYPE_NXF:
+ ack_exception(EXCEPT_TYPE_NXF);
+ if (c6x_nmi_handler)
+ (c6x_nmi_handler)(regs);
+ else
+ pr_alert("NMI interrupt!\n");
+ break;
+
+ case EXCEPT_TYPE_IXF:
+ if (process_iexcept(regs))
+ return 1;
+ break;
+
+ case EXCEPT_TYPE_EXC:
+ process_eexcept(regs);
+ break;
+
+ case EXCEPT_TYPE_SXF:
+ ie_num = 8;
+ default:
+ ack_exception(type_num);
+ do_trap(&iexcept_table[ie_num], regs);
+ break;
+ }
+ }
+ return 0;
+}
+
+static int kstack_depth_to_print = 48;
+
+static void show_trace(unsigned long *stack, unsigned long *endstack)
+{
+ unsigned long addr;
+ int i;
+
+ pr_debug("Call trace:");
+ i = 0;
+ while (stack + 1 <= endstack) {
+ addr = *stack++;
+ /*
+ * If the address is either in the text segment of the
+ * kernel, or in the region which contains vmalloc'ed
+ * memory, it *may* be the address of a calling
+ * routine; if so, print it so that someone tracing
+ * down the cause of the crash will be able to figure
+ * out the call path that was taken.
+ */
+ if (__kernel_text_address(addr)) {
+#ifndef CONFIG_KALLSYMS
+ if (i % 5 == 0)
+ pr_debug("\n ");
+#endif
+ pr_debug(" [<%08lx>]", addr);
+ print_symbol(" %s\n", addr);
+ i++;
+ }
+ }
+ pr_debug("\n");
+}
+
+void show_stack(struct task_struct *task, unsigned long *stack)
+{
+ unsigned long *p, *endstack;
+ int i;
+
+ if (!stack) {
+ if (task && task != current)
+ /* We know this is a kernel stack,
+ so this is the start/end */
+ stack = (unsigned long *)thread_saved_ksp(task);
+ else
+ stack = (unsigned long *)&stack;
+ }
+ endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1)
+ & -THREAD_SIZE);
+
+ pr_debug("Stack from %08lx:", (unsigned long)stack);
+ for (i = 0, p = stack; i < kstack_depth_to_print; i++) {
+ if (p + 1 > endstack)
+ break;
+ if (i % 8 == 0)
+ pr_cont("\n ");
+ pr_cont(" %08lx", *p++);
+ }
+ pr_cont("\n");
+ show_trace(stack, endstack);
+}
+
+int is_valid_bugaddr(unsigned long addr)
+{
+ return __kernel_text_address(addr);
+}