diff options
Diffstat (limited to 'arch/sh/kernel/traps.c')
| -rw-r--r-- | arch/sh/kernel/traps.c | 77 |
1 files changed, 74 insertions, 3 deletions
diff --git a/arch/sh/kernel/traps.c b/arch/sh/kernel/traps.c index 7b036339dc9..dfdad72c61c 100644 --- a/arch/sh/kernel/traps.c +++ b/arch/sh/kernel/traps.c @@ -6,8 +6,79 @@ #include <linux/sched.h> #include <linux/uaccess.h> #include <linux/hardirq.h> +#include <linux/kernel.h> +#include <linux/kexec.h> +#include <linux/module.h> #include <asm/unwinder.h> -#include <asm/system.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; + + oops_enter(); + + spin_lock_irq(&die_lock); + console_verbose(); + bust_spinlocks(1); + + printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter); + print_modules(); + show_regs(regs); + + printk("Process: %s (pid: %d, stack limit = %p)\n", current->comm, + task_pid_nr(current), task_stack_page(current) + 1); + + if (!user_mode(regs) || in_interrupt()) + dump_mem("Stack: ", regs->regs[15], THREAD_SIZE + + (unsigned long)task_stack_page(current)); + + notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV); + + bust_spinlocks(0); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); + spin_unlock_irq(&die_lock); + oops_exit(); + + if (kexec_should_crash(current)) + crash_kexec(regs); + + if (in_interrupt()) + panic("Fatal exception in interrupt"); + + if (panic_on_oops) + panic("Fatal exception"); + + do_exit(SIGSEGV); +} + +void die_if_kernel(const char *str, struct pt_regs *regs, long err) +{ + if (!user_mode(regs)) + die(str, regs, err); +} + +/* + * try and fix up kernelspace address errors + * - userspace errors just cause EFAULT to be returned, resulting in SEGV + * - kernel/userspace interfaces cause a jump to an appropriate handler + * - other kernel errors are bad + */ +void die_if_no_fixup(const char *str, struct pt_regs *regs, long err) +{ + if (!user_mode(regs)) { + const struct exception_table_entry *fixup; + fixup = search_exception_tables(regs->pc); + if (fixup) { + regs->pc = fixup->fixup; + return; + } + + die(str, regs, err); + } +} #ifdef CONFIG_GENERIC_BUG static void handle_BUG(struct pt_regs *regs) @@ -58,7 +129,7 @@ BUILD_TRAP_HANDLER(debug) TRAP_HANDLER_DECL; /* Rewind */ - regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); + regs->pc -= instruction_size(__raw_readw(regs->pc - 4)); if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff, SIGTRAP) == NOTIFY_STOP) @@ -75,7 +146,7 @@ BUILD_TRAP_HANDLER(bug) TRAP_HANDLER_DECL; /* Rewind */ - regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); + regs->pc -= instruction_size(__raw_readw(regs->pc - 4)); if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff, SIGTRAP) == NOTIFY_STOP) |