diff options
Diffstat (limited to 'arch/arm/mm/fault.c')
| -rw-r--r-- | arch/arm/mm/fault.c | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c index bc0e1d8..6f66c0e 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -24,6 +24,10 @@ #include <asm/pgtable.h> #include <asm/tlbflush.h> +#if defined(CONFIG_MACH_Q1_BD) +#include <mach/sec_debug.h> +#endif + #include "fault.h" /* @@ -162,6 +166,29 @@ __do_kernel_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr, do_exit(SIGKILL); } +#if defined(CONFIG_MACH_Q1_BD) +/* + * This function can be used while current pointer is invalid. + */ +static void +__do_kernel_fault_safe(struct mm_struct *mm, unsigned long addr, + unsigned int fsr, struct pt_regs *regs) +{ + static char buf[64] = "__do_kernel_fault_safe"; + + printk(KERN_ALERT + "Unable to handle kernel %s at virtual address %08lx\n", + (addr < PAGE_SIZE) ? "NULL pointer dereference" : + "paging request", addr); + + printk(KERN_ALERT "current is %p\n", current); + + __show_regs(regs); + + sec_debug_panic_handler_safe(buf); +} +#endif + /* * Something tried to access memory that isn't in our memory map.. * User mode accesses just cause a SIGSEGV @@ -283,7 +310,17 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) return 0; tsk = current; - mm = tsk->mm; +#if defined(CONFIG_MACH_Q1_BD) + /* + * If current pointer is NULL, infinite abort can occur. + * It make us get correct debug information in the situation. + */ + if (!tsk) { + __do_kernel_fault_safe(NULL, addr, fsr, regs); + return 0; + } +#endif + mm = tsk->mm; /* * If we're in an interrupt or have no user |