diff options
Diffstat (limited to 'arch/mn10300/kernel/traps.c')
| -rw-r--r-- | arch/mn10300/kernel/traps.c | 615 |
1 files changed, 0 insertions, 615 deletions
diff --git a/arch/mn10300/kernel/traps.c b/arch/mn10300/kernel/traps.c deleted file mode 100644 index 72d1015b2ae7..000000000000 --- a/arch/mn10300/kernel/traps.c +++ /dev/null @@ -1,615 +0,0 @@ -/* 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/sched/debug.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/init.h> -#include <linux/delay.h> -#include <linux/spinlock.h> -#include <linux/interrupt.h> -#include <linux/pci.h> -#include <linux/kdebug.h> -#include <linux/bug.h> -#include <linux/irq.h> -#include <linux/export.h> -#include <asm/processor.h> -#include <linux/uaccess.h> -#include <asm/io.h> -#include <linux/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 <unit/leds.h> -#include <asm/fpu.h> -#include <asm/sections.h> -#include <asm/debugger.h> -#include "internal.h" - -#if (CONFIG_INTERRUPT_VECTOR_BASE & 0xffffff) -#error "INTERRUPT_VECTOR_BASE not aligned to 16MiB boundary!" -#endif - -int kstack_depth_to_print = 24; - -spinlock_t die_lock = __SPIN_LOCK_UNLOCKED(die_lock); - -struct exception_to_signal_map { - u8 signo; - u32 si_code; -}; - -static const struct exception_to_signal_map exception_to_signal_map[256] = { - /* MMU exceptions */ - [EXCEP_ITLBMISS >> 3] = { 0, 0 }, - [EXCEP_DTLBMISS >> 3] = { 0, 0 }, - [EXCEP_IAERROR >> 3] = { 0, 0 }, - [EXCEP_DAERROR >> 3] = { 0, 0 }, - - /* system exceptions */ - [EXCEP_TRAP >> 3] = { SIGTRAP, TRAP_BRKPT }, - [EXCEP_ISTEP >> 3] = { SIGTRAP, TRAP_TRACE }, /* Monitor */ - [EXCEP_IBREAK >> 3] = { SIGTRAP, TRAP_HWBKPT }, /* Monitor */ - [EXCEP_OBREAK >> 3] = { SIGTRAP, TRAP_HWBKPT }, /* Monitor */ - [EXCEP_PRIVINS >> 3] = { SIGILL, ILL_PRVOPC }, - [EXCEP_UNIMPINS >> 3] = { SIGILL, ILL_ILLOPC }, - [EXCEP_UNIMPEXINS >> 3] = { SIGILL, ILL_ILLOPC }, - [EXCEP_MEMERR >> 3] = { SIGSEGV, SEGV_ACCERR }, - [EXCEP_MISALIGN >> 3] = { SIGBUS, BUS_ADRALN }, - [EXCEP_BUSERROR >> 3] = { SIGBUS, BUS_ADRERR }, - [EXCEP_ILLINSACC >> 3] = { SIGSEGV, SEGV_ACCERR }, - [EXCEP_ILLDATACC >> 3] = { SIGSEGV, SEGV_ACCERR }, - [EXCEP_IOINSACC >> 3] = { SIGSEGV, SEGV_ACCERR }, - [EXCEP_PRIVINSACC >> 3] = { SIGSEGV, SEGV_ACCERR }, /* userspace */ - [EXCEP_PRIVDATACC >> 3] = { SIGSEGV, SEGV_ACCERR }, /* userspace */ - [EXCEP_DATINSACC >> 3] = { SIGSEGV, SEGV_ACCERR }, - [EXCEP_DOUBLE_FAULT >> 3] = { SIGILL, ILL_BADSTK }, - - /* FPU exceptions */ - [EXCEP_FPU_DISABLED >> 3] = { SIGILL, ILL_COPROC }, - [EXCEP_FPU_UNIMPINS >> 3] = { SIGILL, ILL_COPROC }, - [EXCEP_FPU_OPERATION >> 3] = { SIGFPE, FPE_INTDIV }, - - /* interrupts */ - [EXCEP_WDT >> 3] = { SIGALRM, 0 }, - [EXCEP_NMI >> 3] = { SIGQUIT, 0 }, - [EXCEP_IRQ_LEVEL0 >> 3] = { SIGINT, 0 }, - [EXCEP_IRQ_LEVEL1 >> 3] = { 0, 0 }, - [EXCEP_IRQ_LEVEL2 >> 3] = { 0, 0 }, - [EXCEP_IRQ_LEVEL3 >> 3] = { 0, 0 }, - [EXCEP_IRQ_LEVEL4 >> 3] = { 0, 0 }, - [EXCEP_IRQ_LEVEL5 >> 3] = { 0, 0 }, - [EXCEP_IRQ_LEVEL6 >> 3] = { 0, 0 }, - - /* system calls */ - [EXCEP_SYSCALL0 >> 3] = { 0, 0 }, - [EXCEP_SYSCALL1 >> 3] = { SIGILL, ILL_ILLTRP }, - [EXCEP_SYSCALL2 >> 3] = { SIGILL, ILL_ILLTRP }, - [EXCEP_SYSCALL3 >> 3] = { SIGILL, ILL_ILLTRP }, - [EXCEP_SYSCALL4 >> 3] = { SIGILL, ILL_ILLTRP }, - [EXCEP_SYSCALL5 >> 3] = { SIGILL, ILL_ILLTRP }, - [EXCEP_SYSCALL6 >> 3] = { SIGILL, ILL_ILLTRP }, - [EXCEP_SYSCALL7 >> 3] = { SIGILL, ILL_ILLTRP }, - [EXCEP_SYSCALL8 >> 3] = { SIGILL, ILL_ILLTRP }, - [EXCEP_SYSCALL9 >> 3] = { SIGILL, ILL_ILLTRP }, - [EXCEP_SYSCALL10 >> 3] = { SIGILL, ILL_ILLTRP }, - [EXCEP_SYSCALL11 >> 3] = { SIGILL, ILL_ILLTRP }, - [EXCEP_SYSCALL12 >> 3] = { SIGILL, ILL_ILLTRP }, - [EXCEP_SYSCALL13 >> 3] = { SIGILL, ILL_ILLTRP }, - [EXCEP_SYSCALL14 >> 3] = { SIGILL, ILL_ILLTRP }, - [EXCEP_SYSCALL15 >> 3] = { SIGABRT, 0 }, -}; - -/* - * Handle kernel exceptions. - * - * 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) -{ - u8 opcode; - int signo, si_code; - - if (user_mode(regs)) - return 0; - - peripheral_leds_display_exception(code); - - signo = exception_to_signal_map[code >> 3].signo; - si_code = exception_to_signal_map[code >> 3].si_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; - break; - - case EXCEP_TRAP: - case EXCEP_UNIMPINS: - if (probe_kernel_read(&opcode, (u8 *)regs->pc, 1) < 0) - break; - if (opcode == 0xff) { - if (notify_die(DIE_BREAKPOINT, str, regs, code, 0, 0)) - return 1; - if (at_debugger_breakpoint(regs)) - regs->pc++; - signo = SIGTRAP; - si_code = TRAP_BRKPT; - } - break; - - case EXCEP_SYSCALL1 ... EXCEP_SYSCALL14: - /* syscall return addr is _after_ the instruction */ - regs->pc -= 2; - break; - - case EXCEP_SYSCALL15: - if (report_bug(regs->pc, regs) == BUG_TRAP_TYPE_WARN) - return 1; - - /* syscall return addr is _after_ the instruction */ - regs->pc -= 2; - break; - - default: - break; - } - - if (debugger_intercept(code, signo, si_code, regs) == 0) - return 1; - - if (notify_die(DIE_GPF, str, regs, code, 0, 0)) - return 1; - - /* make the process die as the last resort */ - die(str, regs, code); -} - -/* - * General exception handler - */ -asmlinkage void handle_exception(struct pt_regs *regs, u32 intcode) -{ - siginfo_t info; - - /* deal with kernel exceptions here */ - if (die_if_no_fixup(NULL, regs, intcode)) - return; - - /* otherwise it's a userspace exception */ - info.si_signo = exception_to_signal_map[intcode >> 3].signo; - info.si_code = exception_to_signal_map[intcode >> 3].si_code; - info.si_errno = 0; - info.si_addr = (void *) regs->pc; - force_sig_info(info.si_signo, &info, current); -} - -/* - * handle NMI - */ -asmlinkage void nmi(struct pt_regs *regs, enum exception_code code) -{ - /* see if gdbstub wants to deal with it */ - if (debugger_intercept(code, SIGQUIT, 0, regs)) - return; - - 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 bottom, stack, addr, fp, raslot; - - printk(KERN_EMERG "\nCall Trace:\n"); - - //stack = (unsigned long)sp; - asm("mov sp,%0" : "=a"(stack)); - asm("mov a3,%0" : "=r"(fp)); - - raslot = ULONG_MAX; - bottom = (stack + THREAD_SIZE) & ~(THREAD_SIZE - 1); - for (; stack < bottom; stack += sizeof(addr)) { - addr = *(unsigned long *)stack; - if (stack == fp) { - if (addr > stack && addr < bottom) { - fp = addr; - raslot = stack + sizeof(addr); - continue; - } - fp = 0; - raslot = ULONG_MAX; - } - - if (__kernel_text_address(addr)) { - printk(" [<%08lx>]", addr); - if (stack >= raslot) - raslot = ULONG_MAX; - else - printk(" ?"); - printk(" %pS\n", (void *)addr); - } - } - - 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(KERN_EMERG " "); - printk("%08lx ", *stack++); - } - - show_trace(sp); -} - -/* - * 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 >= PAGE_OFFSET && - (unsigned long) current < (unsigned long)high_memory) - printk(KERN_EMERG "Process %s (pid: %d)\n", - current->comm, current->pid); - -#ifdef CONFIG_SMP - printk(KERN_EMERG "CPUID: %08x\n", CPUID); -#endif - 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 "\nCode: "); - 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%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 "\nPlease connect to kernel debugger !!\n"); - asm volatile ("0: bra 0b"); - } - - spin_unlock_irq(&die_lock); - do_exit(SIGSEGV); -} - -/* - * 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 "Asynchronous I/O Bus Error\n"); - printk(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 */ - if (debugger_intercept(code, SIGSYS, 0, regs) == 0) - return; - - 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); - unsigned long flags; - - addr = (unsigned long) handler - (unsigned long) vector; - - flags = arch_local_cli_save(); - - 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; - - arch_local_irq_restore(flags); - -#ifndef CONFIG_MN10300_CACHE_SNOOP - mn10300_dcache_flush_inv(); - mn10300_icache_inv(); -#endif -} - -/* - * initialise the exception table - */ -void __init trap_init(void) -{ - set_excp_vector(EXCEP_TRAP, handle_exception); - set_excp_vector(EXCEP_ISTEP, handle_exception); - set_excp_vector(EXCEP_IBREAK, handle_exception); - set_excp_vector(EXCEP_OBREAK, handle_exception); - - set_excp_vector(EXCEP_PRIVINS, handle_exception); - set_excp_vector(EXCEP_UNIMPINS, handle_exception); - set_excp_vector(EXCEP_UNIMPEXINS, handle_exception); - set_excp_vector(EXCEP_MEMERR, handle_exception); - set_excp_vector(EXCEP_MISALIGN, misalignment); - set_excp_vector(EXCEP_BUSERROR, handle_exception); - set_excp_vector(EXCEP_ILLINSACC, handle_exception); - set_excp_vector(EXCEP_ILLDATACC, handle_exception); - set_excp_vector(EXCEP_IOINSACC, handle_exception); - set_excp_vector(EXCEP_PRIVINSACC, handle_exception); - set_excp_vector(EXCEP_PRIVDATACC, handle_exception); - set_excp_vector(EXCEP_DATINSACC, handle_exception); - set_excp_vector(EXCEP_FPU_UNIMPINS, handle_exception); - set_excp_vector(EXCEP_FPU_OPERATION, fpu_exception); - - set_excp_vector(EXCEP_NMI, nmi); - - set_excp_vector(EXCEP_SYSCALL1, handle_exception); - set_excp_vector(EXCEP_SYSCALL2, handle_exception); - set_excp_vector(EXCEP_SYSCALL3, handle_exception); - set_excp_vector(EXCEP_SYSCALL4, handle_exception); - set_excp_vector(EXCEP_SYSCALL5, handle_exception); - set_excp_vector(EXCEP_SYSCALL6, handle_exception); - set_excp_vector(EXCEP_SYSCALL7, handle_exception); - set_excp_vector(EXCEP_SYSCALL8, handle_exception); - set_excp_vector(EXCEP_SYSCALL9, handle_exception); - set_excp_vector(EXCEP_SYSCALL10, handle_exception); - set_excp_vector(EXCEP_SYSCALL11, handle_exception); - set_excp_vector(EXCEP_SYSCALL12, handle_exception); - set_excp_vector(EXCEP_SYSCALL13, handle_exception); - set_excp_vector(EXCEP_SYSCALL14, handle_exception); - set_excp_vector(EXCEP_SYSCALL15, handle_exception); -} - -/* - * determine if a program counter value is a valid bug address - */ -int is_valid_bugaddr(unsigned long pc) -{ - return pc >= PAGE_OFFSET; -} |