diff options
| -rw-r--r-- | arch/cris/arch-v10/kernel/traps.c | 198 |
1 files changed, 95 insertions, 103 deletions
diff --git a/arch/cris/arch-v10/kernel/traps.c b/arch/cris/arch-v10/kernel/traps.c index 4becc1bcced..9eada5d8893 100644 --- a/arch/cris/arch-v10/kernel/traps.c +++ b/arch/cris/arch-v10/kernel/traps.c @@ -1,13 +1,10 @@ -/* $Id: traps.c,v 1.4 2005/04/24 18:47:55 starvik Exp $ +/* + * Helper functions for trap handlers * - * linux/arch/cris/arch-v10/traps.c + * Copyright (C) 2000-2007, Axis Communications AB. * - * Heler functions for trap handlers - * - * Copyright (C) 2000-2002 Axis Communications AB - * - * Authors: Bjorn Wesen - * Hans-Peter Nilsson + * Authors: Bjorn Wesen + * Hans-Peter Nilsson * */ @@ -15,124 +12,119 @@ #include <asm/uaccess.h> #include <asm/arch/sv_addr_ag.h> -extern int raw_printk(const char *fmt, ...); - -void -show_registers(struct pt_regs * regs) +void +show_registers(struct pt_regs *regs) { - /* We either use rdusp() - the USP register, which might not - correspond to the current process for all cases we're called, - or we use the current->thread.usp, which is not up to date for - the current process. Experience shows we want the USP - register. */ + /* + * It's possible to use either the USP register or current->thread.usp. + * USP might not correspond to the current process for all cases this + * function is called, and current->thread.usp isn't up to date for the + * current process. Experience shows that using USP is the way to go. + */ unsigned long usp = rdusp(); - raw_printk("IRP: %08lx SRP: %08lx DCCR: %08lx USP: %08lx MOF: %08lx\n", - regs->irp, regs->srp, regs->dccr, usp, regs->mof ); - raw_printk(" r0: %08lx r1: %08lx r2: %08lx r3: %08lx\n", + printk("IRP: %08lx SRP: %08lx DCCR: %08lx USP: %08lx MOF: %08lx\n", + regs->irp, regs->srp, regs->dccr, usp, regs->mof); + + printk(" r0: %08lx r1: %08lx r2: %08lx r3: %08lx\n", regs->r0, regs->r1, regs->r2, regs->r3); - raw_printk(" r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n", + + printk(" r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n", regs->r4, regs->r5, regs->r6, regs->r7); - raw_printk(" r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n", + + printk(" r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n", regs->r8, regs->r9, regs->r10, regs->r11); - raw_printk("r12: %08lx r13: %08lx oR10: %08lx sp: %08lx\n", - regs->r12, regs->r13, regs->orig_r10, regs); - raw_printk("R_MMU_CAUSE: %08lx\n", (unsigned long)*R_MMU_CAUSE); - raw_printk("Process %s (pid: %d, stackpage=%08lx)\n", + + printk("r12: %08lx r13: %08lx oR10: %08lx sp: %08lx\n", + regs->r12, regs->r13, regs->orig_r10, (long unsigned)regs); + + printk("R_MMU_CAUSE: %08lx\n", (unsigned long)*R_MMU_CAUSE); + + printk("Process %s (pid: %d, stackpage=%08lx)\n", current->comm, current->pid, (unsigned long)current); /* - * When in-kernel, we also print out the stack and code at the - * time of the fault.. - */ - if (! user_mode(regs)) { - int i; + * When in-kernel, we also print out the stack and code at the + * time of the fault.. + */ + if (!user_mode(regs)) { + int i; - show_stack(NULL, (unsigned long*)usp); + show_stack(NULL, (unsigned long *)usp); - /* Dump kernel stack if the previous dump wasn't one. */ + /* + * If the previous stack-dump wasn't a kernel one, dump the + * kernel stack now. + */ if (usp != 0) - show_stack (NULL, NULL); - - raw_printk("\nCode: "); - if(regs->irp < PAGE_OFFSET) - goto bad; - - /* Often enough the value at regs->irp does not point to - the interesting instruction, which is most often the - _previous_ instruction. So we dump at an offset large - enough that instruction decoding should be in sync at - the interesting point, but small enough to fit on a row - (sort of). We point out the regs->irp location in a - ksymoops-friendly way by wrapping the byte for that - address in parentheses. */ - for(i = -12; i < 12; i++) - { - unsigned char c; - if(__get_user(c, &((unsigned char*)regs->irp)[i])) { -bad: - raw_printk(" Bad IP value."); - break; - } + show_stack(NULL, NULL); + + printk("\nCode: "); + + if (regs->irp < PAGE_OFFSET) + goto bad_value; + + /* + * Quite often the value at regs->irp doesn't point to the + * interesting instruction, which often is the previous + * instruction. So dump at an offset large enough that the + * instruction decoding should be in sync at the interesting + * point, but small enough to fit on a row. The regs->irp + * location is pointed out in a ksymoops-friendly way by + * wrapping the byte for that address in parenthesises. + */ + for (i = -12; i < 12; i++) { + unsigned char c; + + if (__get_user(c, &((unsigned char *)regs->irp)[i])) { +bad_value: + printk(" Bad IP value."); + break; + } if (i == 0) - raw_printk("(%02x) ", c); + printk("(%02x) ", c); else - raw_printk("%02x ", c); - } - raw_printk("\n"); - } + printk("%02x ", c); + } + printk("\n"); + } } -/* Called from entry.S when the watchdog has bitten - * We print out something resembling an oops dump, and if - * we have the nice doggy development flag set, we halt here - * instead of rebooting. - */ - -extern void reset_watchdog(void); -extern void stop_watchdog(void); - - void -watchdog_bite_hook(struct pt_regs *regs) +arch_enable_nmi(void) { -#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY - local_irq_disable(); - stop_watchdog(); - show_registers(regs); - while(1) /* nothing */; -#else - show_registers(regs); -#endif + asm volatile ("setf m"); } -/* This is normally the 'Oops' routine */ -void -die_if_kernel(const char * str, struct pt_regs * regs, long err) +extern void (*nmi_handler)(struct pt_regs *); +void handle_nmi(struct pt_regs *regs) { - if(user_mode(regs)) - return; - -#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY - /* This printout might take too long and trigger the - * watchdog normally. If we're in the nice doggy - * development mode, stop the watchdog during printout. - */ - stop_watchdog(); -#endif - - raw_printk("%s: %04lx\n", str, err & 0xffff); - - show_registers(regs); - -#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY - reset_watchdog(); -#endif - do_exit(SIGSEGV); + if (nmi_handler) + nmi_handler(regs); + + /* Wait until nmi is no longer active. (We enable NMI immediately after + returning from this function, and we don't want it happening while + exiting from the NMI interrupt handler.) */ + while (*R_IRQ_MASK0_RD & IO_STATE(R_IRQ_MASK0_RD, nmi_pin, active)) + ; } -void arch_enable_nmi(void) +#ifdef CONFIG_DEBUG_BUGVERBOSE +void +handle_BUG(struct pt_regs *regs) { - asm volatile("setf m"); + struct bug_frame f; + unsigned char c; + unsigned long irp = regs->irp; + + if (__copy_from_user(&f, (const void __user *)(irp - 8), sizeof f)) + return; + if (f.prefix != BUG_PREFIX || f.magic != BUG_MAGIC) + return; + if (__get_user(c, f.filename)) + f.filename = "<bad filename>"; + + printk("kernel BUG at %s:%d!\n", f.filename, f.line); } +#endif |