diff options
Diffstat (limited to 'arch/arm/kernel/traps.c')
| -rw-r--r-- | arch/arm/kernel/traps.c | 43 |
1 files changed, 24 insertions, 19 deletions
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index c8e4bb714944..0c8b10801d36 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -25,6 +25,7 @@ #include <linux/delay.h> #include <linux/init.h> #include <linux/sched.h> +#include <linux/irq.h> #include <linux/atomic.h> #include <asm/cacheflush.h> @@ -460,10 +461,29 @@ die_sig: arm_notify_die("Oops - undefined instruction", regs, &info, 0, 6); } -asmlinkage void do_unexp_fiq (struct pt_regs *regs) +/* + * Handle FIQ similarly to NMI on x86 systems. + * + * The runtime environment for NMIs is extremely restrictive + * (NMIs can pre-empt critical sections meaning almost all locking is + * forbidden) meaning this default FIQ handling must only be used in + * circumstances where non-maskability improves robustness, such as + * watchdog or debug logic. + * + * This handler is not appropriate for general purpose use in drivers + * platform code and can be overrideen using set_fiq_handler. + */ +asmlinkage void __exception_irq_entry handle_fiq_as_nmi(struct pt_regs *regs) { - printk("Hmm. Unexpected FIQ received, but trying to continue\n"); - printk("You may have a hardware problem...\n"); + struct pt_regs *old_regs = set_irq_regs(regs); + + nmi_enter(); + + /* nop. FIQ handlers for special arch/arm features can be added here. */ + + nmi_exit(); + + set_irq_regs(old_regs); } /* @@ -581,7 +601,6 @@ do_cache_op(unsigned long start, unsigned long end, int flags) #define NR(x) ((__ARM_NR_##x) - __ARM_NR_BASE) asmlinkage int arm_syscall(int no, struct pt_regs *regs) { - struct thread_info *thread = current_thread_info(); siginfo_t info; if ((no >> 16) != (__ARM_NR_BASE>> 16)) @@ -632,21 +651,7 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs) return regs->ARM_r0; case NR(set_tls): - thread->tp_value[0] = regs->ARM_r0; - if (tls_emu) - return 0; - if (has_tls_reg) { - asm ("mcr p15, 0, %0, c13, c0, 3" - : : "r" (regs->ARM_r0)); - } else { - /* - * User space must never try to access this directly. - * Expect your app to break eventually if you do so. - * The user helper at 0xffff0fe0 must be used instead. - * (see entry-armv.S for details) - */ - *((unsigned int *)0xffff0ff0) = regs->ARM_r0; - } + set_tls(regs->ARM_r0); return 0; #ifdef CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG |