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-rw-r--r--arch/mn10300/kernel/traps.c619
1 files changed, 619 insertions, 0 deletions
diff --git a/arch/mn10300/kernel/traps.c b/arch/mn10300/kernel/traps.c
new file mode 100644
index 000000000000..8b9dc6d9dcc6
--- /dev/null
+++ b/arch/mn10300/kernel/traps.c
@@ -0,0 +1,619 @@
+/* MN10300 Exception handling
+ *
+ * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Modified by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/kallsyms.h>
+#include <linux/pci.h>
+#include <linux/kdebug.h>
+#include <linux/bug.h>
+#include <linux/irq.h>
+#include <asm/processor.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/atomic.h>
+#include <asm/smp.h>
+#include <asm/pgalloc.h>
+#include <asm/cacheflush.h>
+#include <asm/cpu-regs.h>
+#include <asm/busctl-regs.h>
+#include <asm/unit/leds.h>
+#include <asm/fpu.h>
+#include <asm/gdb-stub.h>
+#include <asm/sections.h>
+
+#if (CONFIG_INTERRUPT_VECTOR_BASE & 0xffffff)
+#error "INTERRUPT_VECTOR_BASE not aligned to 16MiB boundary!"
+#endif
+
+struct pt_regs *__frame; /* current frame pointer */
+EXPORT_SYMBOL(__frame);
+
+int kstack_depth_to_print = 24;
+
+spinlock_t die_lock = __SPIN_LOCK_UNLOCKED(die_lock);
+
+ATOMIC_NOTIFIER_HEAD(mn10300_die_chain);
+
+/*
+ * These constants are for searching for possible module text
+ * segments. MODULE_RANGE is a guess of how much space is likely
+ * to be vmalloced.
+ */
+#define MODULE_RANGE (8 * 1024 * 1024)
+
+#define DO_ERROR(signr, prologue, str, name) \
+asmlinkage void name(struct pt_regs *regs, u32 intcode) \
+{ \
+ prologue; \
+ if (die_if_no_fixup(str, regs, intcode)) \
+ return; \
+ force_sig(signr, current); \
+}
+
+#define DO_EINFO(signr, prologue, str, name, sicode) \
+asmlinkage void name(struct pt_regs *regs, u32 intcode) \
+{ \
+ siginfo_t info; \
+ prologue; \
+ if (die_if_no_fixup(str, regs, intcode)) \
+ return; \
+ info.si_signo = signr; \
+ if (signr == SIGILL && sicode == ILL_ILLOPC) { \
+ uint8_t opcode; \
+ if (get_user(opcode, (uint8_t __user *)regs->pc) == 0) \
+ if (opcode == 0xff) \
+ info.si_signo = SIGTRAP; \
+ } \
+ info.si_errno = 0; \
+ info.si_code = sicode; \
+ info.si_addr = (void *) regs->pc; \
+ force_sig_info(info.si_signo, &info, current); \
+}
+
+DO_ERROR(SIGTRAP, {}, "trap", trap);
+DO_ERROR(SIGSEGV, {}, "ibreak", ibreak);
+DO_ERROR(SIGSEGV, {}, "obreak", obreak);
+DO_EINFO(SIGSEGV, {}, "access error", access_error, SEGV_ACCERR);
+DO_EINFO(SIGSEGV, {}, "insn access error", insn_acc_error, SEGV_ACCERR);
+DO_EINFO(SIGSEGV, {}, "data access error", data_acc_error, SEGV_ACCERR);
+DO_EINFO(SIGILL, {}, "privileged opcode", priv_op, ILL_PRVOPC);
+DO_EINFO(SIGILL, {}, "invalid opcode", invalid_op, ILL_ILLOPC);
+DO_EINFO(SIGILL, {}, "invalid ex opcode", invalid_exop, ILL_ILLOPC);
+DO_EINFO(SIGBUS, {}, "invalid address", mem_error, BUS_ADRERR);
+DO_EINFO(SIGBUS, {}, "bus error", bus_error, BUS_ADRERR);
+DO_EINFO(SIGILL, {}, "FPU invalid opcode", fpu_invalid_op, ILL_COPROC);
+
+DO_ERROR(SIGTRAP,
+#ifndef CONFIG_MN10300_USING_JTAG
+ DCR &= ~0x0001,
+#else
+ {},
+#endif
+ "single step", istep);
+
+/*
+ * handle NMI
+ */
+asmlinkage void nmi(struct pt_regs *regs, enum exception_code code)
+{
+ /* see if gdbstub wants to deal with it */
+#ifdef CONFIG_GDBSTUB
+ if (gdbstub_intercept(regs, code))
+ return;
+#endif
+
+ printk(KERN_WARNING "--- Register Dump ---\n");
+ show_registers(regs);
+ printk(KERN_WARNING "---------------------\n");
+}
+
+/*
+ * show a stack trace from the specified stack pointer
+ */
+void show_trace(unsigned long *sp)
+{
+ unsigned long *stack, addr, module_start, module_end;
+ int i;
+
+ printk(KERN_EMERG "\n"
+ KERN_EMERG "Call Trace:");
+
+ stack = sp;
+ i = 0;
+ module_start = VMALLOC_START;
+ module_end = VMALLOC_END;
+
+ while (((long) stack & (THREAD_SIZE - 1)) != 0) {
+ addr = *stack++;
+ if (__kernel_text_address(addr)) {
+#if 1
+ printk(" [<%08lx>]", addr);
+ print_symbol(" %s", addr);
+ printk("\n");
+#else
+ if ((i % 6) == 0)
+ printk("\n" KERN_EMERG " ");
+ printk("[<%08lx>] ", addr);
+ i++;
+#endif
+ }
+ }
+
+ printk("\n");
+}
+
+/*
+ * show the raw stack from the specified stack pointer
+ */
+void show_stack(struct task_struct *task, unsigned long *sp)
+{
+ unsigned long *stack;
+ int i;
+
+ if (!sp)
+ sp = (unsigned long *) &sp;
+
+ stack = sp;
+ printk(KERN_EMERG "Stack:");
+ for (i = 0; i < kstack_depth_to_print; i++) {
+ if (((long) stack & (THREAD_SIZE - 1)) == 0)
+ break;
+ if ((i % 8) == 0)
+ printk("\n" KERN_EMERG " ");
+ printk("%08lx ", *stack++);
+ }
+
+ show_trace(sp);
+}
+
+/*
+ * the architecture-independent dump_stack generator
+ */
+void dump_stack(void)
+{
+ unsigned long stack;
+
+ show_stack(current, &stack);
+}
+EXPORT_SYMBOL(dump_stack);
+
+/*
+ * dump the register file in the specified exception frame
+ */
+void show_registers_only(struct pt_regs *regs)
+{
+ unsigned long ssp;
+
+ ssp = (unsigned long) regs + sizeof(*regs);
+
+ printk(KERN_EMERG "PC: %08lx EPSW: %08lx SSP: %08lx mode: %s\n",
+ regs->pc, regs->epsw, ssp, user_mode(regs) ? "User" : "Super");
+ printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
+ regs->d0, regs->d1, regs->d2, regs->d3);
+ printk(KERN_EMERG "a0: %08lx a1: %08lx a2: %08lx a3: %08lx\n",
+ regs->a0, regs->a1, regs->a2, regs->a3);
+ printk(KERN_EMERG "e0: %08lx e1: %08lx e2: %08lx e3: %08lx\n",
+ regs->e0, regs->e1, regs->e2, regs->e3);
+ printk(KERN_EMERG "e4: %08lx e5: %08lx e6: %08lx e7: %08lx\n",
+ regs->e4, regs->e5, regs->e6, regs->e7);
+ printk(KERN_EMERG "lar: %08lx lir: %08lx mdr: %08lx usp: %08lx\n",
+ regs->lar, regs->lir, regs->mdr, regs->sp);
+ printk(KERN_EMERG "cvf: %08lx crl: %08lx crh: %08lx drq: %08lx\n",
+ regs->mcvf, regs->mcrl, regs->mcrh, regs->mdrq);
+ printk(KERN_EMERG "threadinfo=%p task=%p)\n",
+ current_thread_info(), current);
+
+ if ((unsigned long) current >= 0x90000000UL &&
+ (unsigned long) current < 0x94000000UL)
+ printk(KERN_EMERG "Process %s (pid: %d)\n",
+ current->comm, current->pid);
+
+ printk(KERN_EMERG "CPUP: %04hx\n", CPUP);
+ printk(KERN_EMERG "TBR: %08x\n", TBR);
+ printk(KERN_EMERG "DEAR: %08x\n", DEAR);
+ printk(KERN_EMERG "sISR: %08x\n", sISR);
+ printk(KERN_EMERG "NMICR: %04hx\n", NMICR);
+ printk(KERN_EMERG "BCBERR: %08x\n", BCBERR);
+ printk(KERN_EMERG "BCBEAR: %08x\n", BCBEAR);
+ printk(KERN_EMERG "MMUFCR: %08x\n", MMUFCR);
+ printk(KERN_EMERG "IPTEU : %08x IPTEL2: %08x\n", IPTEU, IPTEL2);
+ printk(KERN_EMERG "DPTEU: %08x DPTEL2: %08x\n", DPTEU, DPTEL2);
+}
+
+/*
+ * dump the registers and the stack
+ */
+void show_registers(struct pt_regs *regs)
+{
+ unsigned long sp;
+ int i;
+
+ show_registers_only(regs);
+
+ if (!user_mode(regs))
+ sp = (unsigned long) regs + sizeof(*regs);
+ else
+ sp = regs->sp;
+
+ /* when in-kernel, we also print out the stack and code at the
+ * time of the fault..
+ */
+ if (!user_mode(regs)) {
+ printk(KERN_EMERG "\n");
+ show_stack(current, (unsigned long *) sp);
+
+#if 0
+ printk(KERN_EMERG "\n"
+ KERN_EMERG "Code: ");
+ if (regs->pc < PAGE_OFFSET)
+ goto bad;
+
+ for (i = 0; i < 20; i++) {
+ unsigned char c;
+ if (__get_user(c, &((unsigned char *) regs->pc)[i]))
+ goto bad;
+ printk("%02x ", c);
+ }
+#else
+ i = 0;
+#endif
+ }
+
+ printk("\n");
+ return;
+
+#if 0
+bad:
+ printk(KERN_EMERG " Bad PC value.");
+ break;
+#endif
+}
+
+/*
+ *
+ */
+void show_trace_task(struct task_struct *tsk)
+{
+ unsigned long sp = tsk->thread.sp;
+
+ /* User space on another CPU? */
+ if ((sp ^ (unsigned long) tsk) & (PAGE_MASK << 1))
+ return;
+
+ show_trace((unsigned long *) sp);
+}
+
+/*
+ * note the untimely death of part of the kernel
+ */
+void die(const char *str, struct pt_regs *regs, enum exception_code code)
+{
+ console_verbose();
+ spin_lock_irq(&die_lock);
+ printk(KERN_EMERG "\n"
+ KERN_EMERG "%s: %04x\n",
+ str, code & 0xffff);
+ show_registers(regs);
+
+ if (regs->pc >= 0x02000000 && regs->pc < 0x04000000 &&
+ (regs->epsw & (EPSW_IM | EPSW_IE)) != (EPSW_IM | EPSW_IE)) {
+ printk(KERN_EMERG "Exception in usermode interrupt handler\n");
+ printk(KERN_EMERG "\n"
+ KERN_EMERG " Please connect to kernel debugger !!\n");
+ asm volatile ("0: bra 0b");
+ }
+
+ spin_unlock_irq(&die_lock);
+ do_exit(SIGSEGV);
+}
+
+/*
+ * see if there's a fixup handler we can force a jump to when an exception
+ * happens due to something kernel code did
+ */
+int die_if_no_fixup(const char *str, struct pt_regs *regs,
+ enum exception_code code)
+{
+ if (user_mode(regs))
+ return 0;
+
+ peripheral_leds_display_exception(code);
+
+ switch (code) {
+ /* see if we can fixup the kernel accessing memory */
+ case EXCEP_ITLBMISS:
+ case EXCEP_DTLBMISS:
+ case EXCEP_IAERROR:
+ case EXCEP_DAERROR:
+ case EXCEP_MEMERR:
+ case EXCEP_MISALIGN:
+ case EXCEP_BUSERROR:
+ case EXCEP_ILLDATACC:
+ case EXCEP_IOINSACC:
+ case EXCEP_PRIVINSACC:
+ case EXCEP_PRIVDATACC:
+ case EXCEP_DATINSACC:
+ if (fixup_exception(regs))
+ return 1;
+ case EXCEP_UNIMPINS:
+ if (regs->pc && *(uint8_t *)regs->pc == 0xff)
+ if (notify_die(DIE_BREAKPOINT, str, regs, code, 0, 0))
+ return 1;
+ break;
+ default:
+ break;
+ }
+
+ /* see if gdbstub wants to deal with it */
+#ifdef CONFIG_GDBSTUB
+ if (gdbstub_intercept(regs, code))
+ return 1;
+#endif
+
+ if (notify_die(DIE_GPF, str, regs, code, 0, 0))
+ return 1;
+
+ /* make the process die as the last resort */
+ die(str, regs, code);
+}
+
+/*
+ * handle unsupported syscall instructions (syscall 1-15)
+ */
+static asmlinkage void unsupported_syscall(struct pt_regs *regs,
+ enum exception_code code)
+{
+ struct task_struct *tsk = current;
+ siginfo_t info;
+
+ /* catch a kernel BUG() */
+ if (code == EXCEP_SYSCALL15 && !user_mode(regs)) {
+ if (report_bug(regs->pc, regs) == BUG_TRAP_TYPE_BUG) {
+#ifdef CONFIG_GDBSTUB
+ __gdbstub_bug_trap();
+#endif
+ }
+ }
+
+ regs->pc -= 2; /* syscall return addr is _after_ the instruction */
+
+ die_if_no_fixup("An unsupported syscall insn was used by the kernel\n",
+ regs, code);
+
+ info.si_signo = SIGILL;
+ info.si_errno = ENOSYS;
+ info.si_code = ILL_ILLTRP;
+ info.si_addr = (void *) regs->pc;
+ force_sig_info(SIGILL, &info, tsk);
+}
+
+/*
+ * display the register file when the stack pointer gets clobbered
+ */
+asmlinkage void do_double_fault(struct pt_regs *regs)
+{
+ struct task_struct *tsk = current;
+
+ strcpy(tsk->comm, "emergency tsk");
+ tsk->pid = 0;
+ console_verbose();
+ printk(KERN_EMERG "--- double fault ---\n");
+ show_registers(regs);
+}
+
+/*
+ * asynchronous bus error (external, usually I/O DMA)
+ */
+asmlinkage void io_bus_error(u32 bcberr, u32 bcbear, struct pt_regs *regs)
+{
+ console_verbose();
+
+ printk(KERN_EMERG "\n"
+ KERN_EMERG "Asynchronous I/O Bus Error\n"
+ KERN_EMERG "==========================\n");
+
+ if (bcberr & BCBERR_BEME)
+ printk(KERN_EMERG "- Multiple recorded errors\n");
+
+ printk(KERN_EMERG "- Faulting Buses:%s%s%s\n",
+ bcberr & BCBERR_BEMR_CI ? " CPU-Ins-Fetch" : "",
+ bcberr & BCBERR_BEMR_CD ? " CPU-Data" : "",
+ bcberr & BCBERR_BEMR_DMA ? " DMA" : "");
+
+ printk(KERN_EMERG "- %s %s access made to %s at address %08x\n",
+ bcberr & BCBERR_BEBST ? "Burst" : "Single",
+ bcberr & BCBERR_BERW ? "Read" : "Write",
+ bcberr & BCBERR_BESB_MON ? "Monitor Space" :
+ bcberr & BCBERR_BESB_IO ? "Internal CPU I/O Space" :
+ bcberr & BCBERR_BESB_EX ? "External I/O Bus" :
+ bcberr & BCBERR_BESB_OPEX ? "External Memory Bus" :
+ "On Chip Memory",
+ bcbear
+ );
+
+ printk(KERN_EMERG "- Detected by the %s\n",
+ bcberr&BCBERR_BESD ? "Bus Control Unit" : "Slave Bus");
+
+#ifdef CONFIG_PCI
+#define BRIDGEREGB(X) (*(volatile __u8 *)(0xBE040000 + (X)))
+#define BRIDGEREGW(X) (*(volatile __u16 *)(0xBE040000 + (X)))
+#define BRIDGEREGL(X) (*(volatile __u32 *)(0xBE040000 + (X)))
+
+ printk(KERN_EMERG "- PCI Memory Paging Reg: %08x\n",
+ *(volatile __u32 *) (0xBFFFFFF4));
+ printk(KERN_EMERG "- PCI Bridge Base Address 0: %08x\n",
+ BRIDGEREGL(PCI_BASE_ADDRESS_0));
+ printk(KERN_EMERG "- PCI Bridge AMPCI Base Address: %08x\n",
+ BRIDGEREGL(0x48));
+ printk(KERN_EMERG "- PCI Bridge Command: %04hx\n",
+ BRIDGEREGW(PCI_COMMAND));
+ printk(KERN_EMERG "- PCI Bridge Status: %04hx\n",
+ BRIDGEREGW(PCI_STATUS));
+ printk(KERN_EMERG "- PCI Bridge Int Status: %08hx\n",
+ BRIDGEREGL(0x4c));
+#endif
+
+ printk(KERN_EMERG "\n");
+ show_registers(regs);
+
+ panic("Halted due to asynchronous I/O Bus Error\n");
+}
+
+/*
+ * handle an exception for which a handler has not yet been installed
+ */
+asmlinkage void uninitialised_exception(struct pt_regs *regs,
+ enum exception_code code)
+{
+
+ /* see if gdbstub wants to deal with it */
+#ifdef CONFIG_GDBSTUB
+ if (gdbstub_intercept(regs, code))
+ return;
+#endif
+
+ peripheral_leds_display_exception(code);
+ printk(KERN_EMERG "Uninitialised Exception 0x%04x\n", code & 0xFFFF);
+ show_registers(regs);
+
+ for (;;)
+ continue;
+}
+
+/*
+ * set an interrupt stub to jump to a handler
+ * ! NOTE: this does *not* flush the caches
+ */
+void __init __set_intr_stub(enum exception_code code, void *handler)
+{
+ unsigned long addr;
+ u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);
+
+ addr = (unsigned long) handler - (unsigned long) vector;
+ vector[0] = 0xdc; /* JMP handler */
+ vector[1] = addr;
+ vector[2] = addr >> 8;
+ vector[3] = addr >> 16;
+ vector[4] = addr >> 24;
+ vector[5] = 0xcb;
+ vector[6] = 0xcb;
+ vector[7] = 0xcb;
+}
+
+/*
+ * set an interrupt stub to jump to a handler
+ */
+void __init set_intr_stub(enum exception_code code, void *handler)
+{
+ unsigned long addr;
+ u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);
+
+ addr = (unsigned long) handler - (unsigned long) vector;
+ vector[0] = 0xdc; /* JMP handler */
+ vector[1] = addr;
+ vector[2] = addr >> 8;
+ vector[3] = addr >> 16;
+ vector[4] = addr >> 24;
+ vector[5] = 0xcb;
+ vector[6] = 0xcb;
+ vector[7] = 0xcb;
+
+ mn10300_dcache_flush_inv();
+ mn10300_icache_inv();
+}
+
+/*
+ * set an interrupt stub to invoke the JTAG unit and then jump to a handler
+ */
+void __init set_jtag_stub(enum exception_code code, void *handler)
+{
+ unsigned long addr;
+ u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);
+
+ addr = (unsigned long) handler - ((unsigned long) vector + 1);
+ vector[0] = 0xff; /* PI to jump into JTAG debugger */
+ vector[1] = 0xdc; /* jmp handler */
+ vector[2] = addr;
+ vector[3] = addr >> 8;
+ vector[4] = addr >> 16;
+ vector[5] = addr >> 24;
+ vector[6] = 0xcb;
+ vector[7] = 0xcb;
+
+ mn10300_dcache_flush_inv();
+ flush_icache_range((unsigned long) vector, (unsigned long) vector + 8);
+}
+
+/*
+ * initialise the exception table
+ */
+void __init trap_init(void)
+{
+ set_excp_vector(EXCEP_TRAP, trap);
+ set_excp_vector(EXCEP_ISTEP, istep);
+ set_excp_vector(EXCEP_IBREAK, ibreak);
+ set_excp_vector(EXCEP_OBREAK, obreak);
+
+ set_excp_vector(EXCEP_PRIVINS, priv_op);
+ set_excp_vector(EXCEP_UNIMPINS, invalid_op);
+ set_excp_vector(EXCEP_UNIMPEXINS, invalid_exop);
+ set_excp_vector(EXCEP_MEMERR, mem_error);
+ set_excp_vector(EXCEP_MISALIGN, misalignment);
+ set_excp_vector(EXCEP_BUSERROR, bus_error);
+ set_excp_vector(EXCEP_ILLINSACC, insn_acc_error);
+ set_excp_vector(EXCEP_ILLDATACC, data_acc_error);
+ set_excp_vector(EXCEP_IOINSACC, insn_acc_error);
+ set_excp_vector(EXCEP_PRIVINSACC, insn_acc_error);
+ set_excp_vector(EXCEP_PRIVDATACC, data_acc_error);
+ set_excp_vector(EXCEP_DATINSACC, insn_acc_error);
+ set_excp_vector(EXCEP_FPU_DISABLED, fpu_disabled);
+ set_excp_vector(EXCEP_FPU_UNIMPINS, fpu_invalid_op);
+ set_excp_vector(EXCEP_FPU_OPERATION, fpu_exception);
+
+ set_excp_vector(EXCEP_NMI, nmi);
+
+ set_excp_vector(EXCEP_SYSCALL1, unsupported_syscall);
+ set_excp_vector(EXCEP_SYSCALL2, unsupported_syscall);
+ set_excp_vector(EXCEP_SYSCALL3, unsupported_syscall);
+ set_excp_vector(EXCEP_SYSCALL4, unsupported_syscall);
+ set_excp_vector(EXCEP_SYSCALL5, unsupported_syscall);
+ set_excp_vector(EXCEP_SYSCALL6, unsupported_syscall);
+ set_excp_vector(EXCEP_SYSCALL7, unsupported_syscall);
+ set_excp_vector(EXCEP_SYSCALL8, unsupported_syscall);
+ set_excp_vector(EXCEP_SYSCALL9, unsupported_syscall);
+ set_excp_vector(EXCEP_SYSCALL10, unsupported_syscall);
+ set_excp_vector(EXCEP_SYSCALL11, unsupported_syscall);
+ set_excp_vector(EXCEP_SYSCALL12, unsupported_syscall);
+ set_excp_vector(EXCEP_SYSCALL13, unsupported_syscall);
+ set_excp_vector(EXCEP_SYSCALL14, unsupported_syscall);
+ set_excp_vector(EXCEP_SYSCALL15, unsupported_syscall);
+}
+
+/*
+ * determine if a program counter value is a valid bug address
+ */
+int is_valid_bugaddr(unsigned long pc)
+{
+ return pc >= PAGE_OFFSET;
+}
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