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Diffstat (limited to 'arch/v850/kernel/bug.c')
| -rw-r--r-- | arch/v850/kernel/bug.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/arch/v850/kernel/bug.c b/arch/v850/kernel/bug.c new file mode 100644 index 000000000000..c78cf750915a --- /dev/null +++ b/arch/v850/kernel/bug.c @@ -0,0 +1,142 @@ +/* + * arch/v850/kernel/bug.c -- Bug reporting functions + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/kernel.h> +#include <linux/reboot.h> +#include <linux/sched.h> +#include <linux/module.h> + +#include <asm/errno.h> +#include <asm/ptrace.h> +#include <asm/processor.h> +#include <asm/current.h> + +/* We should use __builtin_return_address, but it doesn't work in gcc-2.90 + (which is currently our standard compiler on the v850). */ +#define ret_addr() ({ register u32 lp asm ("lp"); lp; }) +#define stack_addr() ({ register u32 sp asm ("sp"); sp; }) + +void __bug () +{ + printk (KERN_CRIT "kernel BUG at PC 0x%x (SP ~0x%x)!\n", + ret_addr() - 4, /* - 4 for `jarl' */ + stack_addr()); + machine_halt (); +} + +int bad_trap (int trap_num, struct pt_regs *regs) +{ + printk (KERN_CRIT + "unimplemented trap %d called at 0x%08lx, pid %d!\n", + trap_num, regs->pc, current->pid); + return -ENOSYS; +} + +#ifdef CONFIG_RESET_GUARD +void unexpected_reset (unsigned long ret_addr, unsigned long kmode, + struct task_struct *task, unsigned long sp) +{ + printk (KERN_CRIT + "unexpected reset in %s mode, pid %d" + " (ret_addr = 0x%lx, sp = 0x%lx)\n", + kmode ? "kernel" : "user", + task ? task->pid : -1, + ret_addr, sp); + + machine_halt (); +} +#endif /* CONFIG_RESET_GUARD */ + + + +struct spec_reg_name { + const char *name; + int gpr; +}; + +struct spec_reg_name spec_reg_names[] = { + { "sp", GPR_SP }, + { "gp", GPR_GP }, + { "tp", GPR_TP }, + { "ep", GPR_EP }, + { "lp", GPR_LP }, + { 0, 0 } +}; + +void show_regs (struct pt_regs *regs) +{ + int gpr_base, gpr_offs; + + printk (" pc 0x%08lx psw 0x%08lx kernel_mode %d\n", + regs->pc, regs->psw, regs->kernel_mode); + printk (" ctpc 0x%08lx ctpsw 0x%08lx ctbp 0x%08lx\n", + regs->ctpc, regs->ctpsw, regs->ctbp); + + for (gpr_base = 0; gpr_base < NUM_GPRS; gpr_base += 4) { + for (gpr_offs = 0; gpr_offs < 4; gpr_offs++) { + int gpr = gpr_base + gpr_offs; + long val = regs->gpr[gpr]; + struct spec_reg_name *srn; + + for (srn = spec_reg_names; srn->name; srn++) + if (srn->gpr == gpr) + break; + + if (srn->name) + printk ("%7s 0x%08lx", srn->name, val); + else + printk (" r%02d 0x%08lx", gpr, val); + } + + printk ("\n"); + } +} + +/* + * TASK is a pointer to the task whose backtrace we want to see (or NULL + * for current task), SP is the stack pointer of the first frame that + * should be shown in the back trace (or NULL if the entire call-chain of + * the task should be shown). + */ +void show_stack (struct task_struct *task, unsigned long *sp) +{ + unsigned long addr, end; + + if (sp) + addr = (unsigned long)sp; + else if (task) + addr = task_sp (task); + else + addr = stack_addr (); + + addr = addr & ~3; + end = (addr + THREAD_SIZE - 1) & THREAD_MASK; + + while (addr < end) { + printk ("%8lX: ", addr); + while (addr < end) { + printk (" %8lX", *(unsigned long *)addr); + addr += sizeof (unsigned long); + if (! (addr & 0xF)) + break; + } + printk ("\n"); + } +} + +void dump_stack () +{ + show_stack (0, 0); +} + +EXPORT_SYMBOL(dump_stack); |