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Diffstat (limited to 'arch/arm/kernel/traps.c')
-rw-r--r--arch/arm/kernel/traps.c81
1 files changed, 45 insertions, 36 deletions
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 57eb0f6f600..f838f36eb70 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -45,21 +45,21 @@ static int __init user_debug_setup(char *str)
__setup("user_debug=", user_debug_setup);
#endif
-static void dump_mem(const char *str, unsigned long bottom, unsigned long top);
+static void dump_mem(const char *, const char *, unsigned long, unsigned long);
void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long frame)
{
#ifdef CONFIG_KALLSYMS
- printk("[<%08lx>] ", where);
- print_symbol("(%s) ", where);
- printk("from [<%08lx>] ", from);
- print_symbol("(%s)\n", from);
+ char sym1[KSYM_SYMBOL_LEN], sym2[KSYM_SYMBOL_LEN];
+ sprint_symbol(sym1, where);
+ sprint_symbol(sym2, from);
+ printk("[<%08lx>] (%s) from [<%08lx>] (%s)\n", where, sym1, from, sym2);
#else
printk("Function entered at [<%08lx>] from [<%08lx>]\n", where, from);
#endif
if (in_exception_text(where))
- dump_mem("Exception stack", frame + 4, frame + 4 + sizeof(struct pt_regs));
+ dump_mem("", "Exception stack", frame + 4, frame + 4 + sizeof(struct pt_regs));
}
#ifndef CONFIG_ARM_UNWIND
@@ -81,9 +81,10 @@ static int verify_stack(unsigned long sp)
/*
* Dump out the contents of some memory nicely...
*/
-static void dump_mem(const char *str, unsigned long bottom, unsigned long top)
+static void dump_mem(const char *lvl, const char *str, unsigned long bottom,
+ unsigned long top)
{
- unsigned long p = bottom & ~31;
+ unsigned long first;
mm_segment_t fs;
int i;
@@ -95,33 +96,37 @@ static void dump_mem(const char *str, unsigned long bottom, unsigned long top)
fs = get_fs();
set_fs(KERNEL_DS);
- printk("%s(0x%08lx to 0x%08lx)\n", str, bottom, top);
+ printk("%s%s(0x%08lx to 0x%08lx)\n", lvl, str, bottom, top);
- for (p = bottom & ~31; p < top;) {
- printk("%04lx: ", p & 0xffff);
+ for (first = bottom & ~31; first < top; first += 32) {
+ unsigned long p;
+ char str[sizeof(" 12345678") * 8 + 1];
- for (i = 0; i < 8; i++, p += 4) {
- unsigned int val;
+ memset(str, ' ', sizeof(str));
+ str[sizeof(str) - 1] = '\0';
- if (p < bottom || p >= top)
- printk(" ");
- else {
- __get_user(val, (unsigned long *)p);
- printk("%08x ", val);
+ for (p = first, i = 0; i < 8 && p < top; i++, p += 4) {
+ if (p >= bottom && p < top) {
+ unsigned long val;
+ if (__get_user(val, (unsigned long *)p) == 0)
+ sprintf(str + i * 9, " %08lx", val);
+ else
+ sprintf(str + i * 9, " ????????");
}
}
- printk ("\n");
+ printk("%s%04lx:%s\n", lvl, first & 0xffff, str);
}
set_fs(fs);
}
-static void dump_instr(struct pt_regs *regs)
+static void dump_instr(const char *lvl, struct pt_regs *regs)
{
unsigned long addr = instruction_pointer(regs);
const int thumb = thumb_mode(regs);
const int width = thumb ? 4 : 8;
mm_segment_t fs;
+ char str[sizeof("00000000 ") * 5 + 2 + 1], *p = str;
int i;
/*
@@ -132,7 +137,6 @@ static void dump_instr(struct pt_regs *regs)
fs = get_fs();
set_fs(KERNEL_DS);
- printk("Code: ");
for (i = -4; i < 1; i++) {
unsigned int val, bad;
@@ -142,13 +146,14 @@ static void dump_instr(struct pt_regs *regs)
bad = __get_user(val, &((u32 *)addr)[i]);
if (!bad)
- printk(i == 0 ? "(%0*x) " : "%0*x ", width, val);
+ p += sprintf(p, i == 0 ? "(%0*x) " : "%0*x ",
+ width, val);
else {
- printk("bad PC value.");
+ p += sprintf(p, "bad PC value");
break;
}
}
- printk("\n");
+ printk("%sCode: %s\n", lvl, str);
set_fs(fs);
}
@@ -224,18 +229,19 @@ static void __die(const char *str, int err, struct thread_info *thread, struct p
struct task_struct *tsk = thread->task;
static int die_counter;
- printk("Internal error: %s: %x [#%d]" S_PREEMPT S_SMP "\n",
+ printk(KERN_EMERG "Internal error: %s: %x [#%d]" S_PREEMPT S_SMP "\n",
str, err, ++die_counter);
+ sysfs_printk_last_file();
print_modules();
__show_regs(regs);
- printk("Process %s (pid: %d, stack limit = 0x%p)\n",
- tsk->comm, task_pid_nr(tsk), thread + 1);
+ printk(KERN_EMERG "Process %.*s (pid: %d, stack limit = 0x%p)\n",
+ TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk), thread + 1);
if (!user_mode(regs) || in_interrupt()) {
- dump_mem("Stack: ", regs->ARM_sp,
+ dump_mem(KERN_EMERG, "Stack: ", regs->ARM_sp,
THREAD_SIZE + (unsigned long)task_stack_page(tsk));
dump_backtrace(regs, tsk);
- dump_instr(regs);
+ dump_instr(KERN_EMERG, regs);
}
}
@@ -250,13 +256,14 @@ NORET_TYPE void die(const char *str, struct pt_regs *regs, int err)
oops_enter();
- console_verbose();
spin_lock_irq(&die_lock);
+ console_verbose();
bust_spinlocks(1);
__die(str, err, thread, regs);
bust_spinlocks(0);
add_taint(TAINT_DIE);
spin_unlock_irq(&die_lock);
+ oops_exit();
if (in_interrupt())
panic("Fatal exception in interrupt");
@@ -264,7 +271,6 @@ NORET_TYPE void die(const char *str, struct pt_regs *regs, int err)
if (panic_on_oops)
panic("Fatal exception");
- oops_exit();
do_exit(SIGSEGV);
}
@@ -349,7 +355,7 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
if (user_debug & UDBG_UNDEFINED) {
printk(KERN_INFO "%s (%d): undefined instruction: pc=%p\n",
current->comm, task_pid_nr(current), pc);
- dump_instr(regs);
+ dump_instr(KERN_INFO, regs);
}
#endif
@@ -400,7 +406,7 @@ static int bad_syscall(int n, struct pt_regs *regs)
if (user_debug & UDBG_SYSCALL) {
printk(KERN_ERR "[%d] %s: obsolete system call %08x.\n",
task_pid_nr(current), current->comm, n);
- dump_instr(regs);
+ dump_instr(KERN_ERR, regs);
}
#endif
@@ -418,12 +424,14 @@ static int bad_syscall(int n, struct pt_regs *regs)
static inline void
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;
- vma = find_vma(current->active_mm, start);
+ down_read(&mm->mmap_sem);
+ vma = find_vma(mm, start);
if (vma && vma->vm_start < end) {
if (start < vma->vm_start)
start = vma->vm_start;
@@ -432,6 +440,7 @@ do_cache_op(unsigned long start, unsigned long end, int flags)
flush_cache_user_range(vma, start, end);
}
+ up_read(&mm->mmap_sem);
}
/*
@@ -576,7 +585,7 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs)
if (user_debug & UDBG_SYSCALL) {
printk("[%d] %s: arm syscall %d\n",
task_pid_nr(current), current->comm, no);
- dump_instr(regs);
+ dump_instr("", regs);
if (user_mode(regs)) {
__show_regs(regs);
c_backtrace(regs->ARM_fp, processor_mode(regs));
@@ -653,7 +662,7 @@ baddataabort(int code, unsigned long instr, struct pt_regs *regs)
if (user_debug & UDBG_BADABORT) {
printk(KERN_ERR "[%d] %s: bad data abort: code %d instr 0x%08lx\n",
task_pid_nr(current), current->comm, code, instr);
- dump_instr(regs);
+ dump_instr(KERN_ERR, regs);
show_pte(current->mm, addr);
}
#endif
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-14 18:11:11 +0000