ARM: show short message on segfault

[pandora-kernel.git] / arch / arm / kernel / traps.c

diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 3f9b4e7..071772c 100644 (file)
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -37,12 +37,18 @@
 
 #include "signal.h"
 
-static const char *handler[]= { "prefetch abort", "data abort", "address exception", "interrupt" };
+static const char *handler[]= {
+       "prefetch abort",
+       "data abort",
+       "address exception",
+       "interrupt",
+       "undefined instruction",
+};
 
 void *vectors_page;
 
 #ifdef CONFIG_DEBUG_USER
-unsigned int user_debug;
+unsigned int user_debug = UDBG_SEGV_SHORT;
 
 static int __init user_debug_setup(char *str)
 {
@@ -466,14 +472,14 @@ static int bad_syscall(int n, struct pt_regs *regs)
        return regs->ARM_r0;
 }
 
-static inline void
+static inline int
 do_cache_op(unsigned long start, unsigned long end, int flags)
 {
        struct mm_struct *mm = current->active_mm;
        struct vm_area_struct *vma;
 
        if (end < start || flags)
-               return;
+               return -EINVAL;
 
        down_read(&mm->mmap_sem);
        vma = find_vma(mm, start);
@@ -484,10 +490,10 @@ do_cache_op(unsigned long start, unsigned long end, int flags)
                        end = vma->vm_end;
 
                up_read(&mm->mmap_sem);
-               flush_cache_user_range(start, end);
-               return;
+               return flush_cache_user_range(start, end);
        }
        up_read(&mm->mmap_sem);
+       return -EINVAL;
 }
 
 /*
@@ -533,8 +539,7 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs)
         * the specified region).
         */
        case NR(cacheflush):
-               do_cache_op(regs->ARM_r0, regs->ARM_r1, regs->ARM_r2);
-               return 0;
+               return do_cache_op(regs->ARM_r0, regs->ARM_r1, regs->ARM_r2);
 
        case NR(usr26):
                if (!(elf_hwcap & HWCAP_26BIT))