diff options
Diffstat (limited to 'arch/avr32/kernel/traps.c')
| -rw-r--r-- | arch/avr32/kernel/traps.c | 262 |
1 files changed, 0 insertions, 262 deletions
diff --git a/arch/avr32/kernel/traps.c b/arch/avr32/kernel/traps.c deleted file mode 100644 index 50b541325025..000000000000 --- a/arch/avr32/kernel/traps.c +++ /dev/null @@ -1,262 +0,0 @@ -/* - * Copyright (C) 2004-2006 Atmel Corporation - * - * 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/bug.h> -#include <linux/hardirq.h> -#include <linux/init.h> -#include <linux/kallsyms.h> -#include <linux/kdebug.h> -#include <linux/extable.h> -#include <linux/module.h> /* print_modules */ -#include <linux/notifier.h> -#include <linux/sched/signal.h> -#include <linux/uaccess.h> - -#include <asm/addrspace.h> -#include <asm/mmu_context.h> -#include <asm/ocd.h> -#include <asm/sysreg.h> -#include <asm/traps.h> - -static DEFINE_SPINLOCK(die_lock); - -void die(const char *str, struct pt_regs *regs, long err) -{ - static int die_counter; - - console_verbose(); - spin_lock_irq(&die_lock); - bust_spinlocks(1); - - printk(KERN_ALERT "Oops: %s, sig: %ld [#%d]\n", - str, err, ++die_counter); - - printk(KERN_EMERG); - -#ifdef CONFIG_PREEMPT - printk(KERN_CONT "PREEMPT "); -#endif -#ifdef CONFIG_FRAME_POINTER - printk(KERN_CONT "FRAME_POINTER "); -#endif - if (current_cpu_data.features & AVR32_FEATURE_OCD) { - unsigned long did = ocd_read(DID); - printk(KERN_CONT "chip: 0x%03lx:0x%04lx rev %lu\n", - (did >> 1) & 0x7ff, - (did >> 12) & 0x7fff, - (did >> 28) & 0xf); - } else { - printk(KERN_CONT "cpu: arch %u r%u / core %u r%u\n", - current_cpu_data.arch_type, - current_cpu_data.arch_revision, - current_cpu_data.cpu_type, - current_cpu_data.cpu_revision); - } - - print_modules(); - show_regs_log_lvl(regs, KERN_EMERG); - show_stack_log_lvl(current, regs->sp, regs, KERN_EMERG); - bust_spinlocks(0); - add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); - spin_unlock_irq(&die_lock); - - if (in_interrupt()) - panic("Fatal exception in interrupt"); - - if (panic_on_oops) - panic("Fatal exception"); - - do_exit(err); -} - -void _exception(long signr, struct pt_regs *regs, int code, - unsigned long addr) -{ - siginfo_t info; - - if (!user_mode(regs)) { - const struct exception_table_entry *fixup; - - /* Are we prepared to handle this kernel fault? */ - fixup = search_exception_tables(regs->pc); - if (fixup) { - regs->pc = fixup->fixup; - return; - } - die("Unhandled exception in kernel mode", regs, signr); - } - - memset(&info, 0, sizeof(info)); - info.si_signo = signr; - info.si_code = code; - info.si_addr = (void __user *)addr; - force_sig_info(signr, &info, current); -} - -asmlinkage void do_nmi(unsigned long ecr, struct pt_regs *regs) -{ - int ret; - - nmi_enter(); - - ret = notify_die(DIE_NMI, "NMI", regs, 0, ecr, SIGINT); - switch (ret) { - case NOTIFY_OK: - case NOTIFY_STOP: - break; - case NOTIFY_BAD: - die("Fatal Non-Maskable Interrupt", regs, SIGINT); - default: - printk(KERN_ALERT "Got NMI, but nobody cared. Disabling...\n"); - nmi_disable(); - break; - } - nmi_exit(); -} - -asmlinkage void do_critical_exception(unsigned long ecr, struct pt_regs *regs) -{ - die("Critical exception", regs, SIGKILL); -} - -asmlinkage void do_address_exception(unsigned long ecr, struct pt_regs *regs) -{ - _exception(SIGBUS, regs, BUS_ADRALN, regs->pc); -} - -/* This way of handling undefined instructions is stolen from ARM */ -static LIST_HEAD(undef_hook); -static DEFINE_SPINLOCK(undef_lock); - -void register_undef_hook(struct undef_hook *hook) -{ - spin_lock_irq(&undef_lock); - list_add(&hook->node, &undef_hook); - spin_unlock_irq(&undef_lock); -} - -void unregister_undef_hook(struct undef_hook *hook) -{ - spin_lock_irq(&undef_lock); - list_del(&hook->node); - spin_unlock_irq(&undef_lock); -} - -static int do_cop_absent(u32 insn) -{ - int cop_nr; - u32 cpucr; - - if ((insn & 0xfdf00000) == 0xf1900000) - /* LDC0 */ - cop_nr = 0; - else - cop_nr = (insn >> 13) & 0x7; - - /* Try enabling the coprocessor */ - cpucr = sysreg_read(CPUCR); - cpucr |= (1 << (24 + cop_nr)); - sysreg_write(CPUCR, cpucr); - - cpucr = sysreg_read(CPUCR); - if (!(cpucr & (1 << (24 + cop_nr)))) - return -ENODEV; - - return 0; -} - -#ifdef CONFIG_BUG -int is_valid_bugaddr(unsigned long pc) -{ - unsigned short opcode; - - if (pc < PAGE_OFFSET) - return 0; - if (probe_kernel_address((u16 *)pc, opcode)) - return 0; - - return opcode == AVR32_BUG_OPCODE; -} -#endif - -asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs) -{ - u32 insn; - struct undef_hook *hook; - void __user *pc; - long code; - -#ifdef CONFIG_BUG - if (!user_mode(regs) && (ecr == ECR_ILLEGAL_OPCODE)) { - enum bug_trap_type type; - - type = report_bug(regs->pc, regs); - switch (type) { - case BUG_TRAP_TYPE_NONE: - break; - case BUG_TRAP_TYPE_WARN: - regs->pc += 2; - return; - case BUG_TRAP_TYPE_BUG: - die("Kernel BUG", regs, SIGKILL); - } - } -#endif - - local_irq_enable(); - - if (user_mode(regs)) { - pc = (void __user *)instruction_pointer(regs); - if (get_user(insn, (u32 __user *)pc)) - goto invalid_area; - - if (ecr == ECR_COPROC_ABSENT && !do_cop_absent(insn)) - return; - - spin_lock_irq(&undef_lock); - list_for_each_entry(hook, &undef_hook, node) { - if ((insn & hook->insn_mask) == hook->insn_val) { - if (hook->fn(regs, insn) == 0) { - spin_unlock_irq(&undef_lock); - return; - } - } - } - spin_unlock_irq(&undef_lock); - } - - switch (ecr) { - case ECR_PRIVILEGE_VIOLATION: - code = ILL_PRVOPC; - break; - case ECR_COPROC_ABSENT: - code = ILL_COPROC; - break; - default: - code = ILL_ILLOPC; - break; - } - - _exception(SIGILL, regs, code, regs->pc); - return; - -invalid_area: - _exception(SIGSEGV, regs, SEGV_MAPERR, regs->pc); -} - -asmlinkage void do_fpe(unsigned long ecr, struct pt_regs *regs) -{ - /* We have no FPU yet */ - _exception(SIGILL, regs, ILL_COPROC, regs->pc); -} - - -void __init trap_init(void) -{ - -} |