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Diffstat (limited to 'arch/blackfin/kernel/traps.c')
-rw-r--r--arch/blackfin/kernel/traps.c94
1 files changed, 58 insertions, 36 deletions
diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index 56a67ab698c..5b847070dae 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -67,6 +67,8 @@ void __init trap_init(void)
CSYNC();
}
+void *saved_icplb_fault_addr, *saved_dcplb_fault_addr;
+
int kstack_depth_to_print = 48;
static void decode_address(char *buf, unsigned long address)
@@ -75,7 +77,7 @@ static void decode_address(char *buf, unsigned long address)
struct task_struct *p;
struct mm_struct *mm;
unsigned long flags, offset;
- unsigned int in_exception = bfin_read_IPEND() & 0x10;
+ unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
#ifdef CONFIG_KALLSYMS
unsigned long symsize;
@@ -117,7 +119,7 @@ static void decode_address(char *buf, unsigned long address)
*/
write_lock_irqsave(&tasklist_lock, flags);
for_each_process(p) {
- mm = (in_exception ? p->mm : get_task_mm(p));
+ mm = (in_atomic ? p->mm : get_task_mm(p));
if (!mm)
continue;
@@ -137,23 +139,36 @@ static void decode_address(char *buf, unsigned long address)
/* FLAT does not have its text aligned to the start of
* the map while FDPIC ELF does ...
*/
- if (current->mm &&
- (address > current->mm->start_code) &&
- (address < current->mm->end_code))
- offset = address - current->mm->start_code;
- else
- offset = (address - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT);
-
- sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
- (void *)address, name, offset);
- if (!in_exception)
+
+ /* before we can check flat/fdpic, we need to
+ * make sure current is valid
+ */
+ if ((unsigned long)current >= FIXED_CODE_START &&
+ !((unsigned long)current & 0x3)) {
+ if (current->mm &&
+ (address > current->mm->start_code) &&
+ (address < current->mm->end_code))
+ offset = address - current->mm->start_code;
+ else
+ offset = (address - vma->vm_start) +
+ (vma->vm_pgoff << PAGE_SHIFT);
+
+ sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
+ (void *)address, name, offset);
+ } else
+ sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
+ (void *)address, name,
+ vma->vm_start, vma->vm_end);
+
+ if (!in_atomic)
mmput(mm);
+
goto done;
}
vml = vml->next;
}
- if (!in_exception)
+ if (!in_atomic)
mmput(mm);
}
@@ -506,7 +521,7 @@ asmlinkage void trap_c(struct pt_regs *fp)
info.si_signo = sig;
info.si_errno = 0;
- info.si_addr = (void *)fp->pc;
+ info.si_addr = (void __user *)fp->pc;
force_sig_info(sig, &info, current);
trace_buffer_restore(j);
@@ -655,21 +670,31 @@ void dump_bfin_process(struct pt_regs *fp)
else if (context & 0x8000)
printk(KERN_NOTICE "Kernel process context\n");
- if (current->pid && current->mm) {
+ /* Because we are crashing, and pointers could be bad, we check things
+ * pretty closely before we use them
+ */
+ if ((unsigned long)current >= FIXED_CODE_START &&
+ !((unsigned long)current & 0x3) && current->pid) {
printk(KERN_NOTICE "CURRENT PROCESS:\n");
- printk(KERN_NOTICE "COMM=%s PID=%d\n",
- current->comm, current->pid);
-
- printk(KERN_NOTICE "TEXT = 0x%p-0x%p DATA = 0x%p-0x%p\n"
- KERN_NOTICE "BSS = 0x%p-0x%p USER-STACK = 0x%p\n"
- KERN_NOTICE "\n",
- (void *)current->mm->start_code,
- (void *)current->mm->end_code,
- (void *)current->mm->start_data,
- (void *)current->mm->end_data,
- (void *)current->mm->end_data,
- (void *)current->mm->brk,
- (void *)current->mm->start_stack);
+ if (current->comm >= (char *)FIXED_CODE_START)
+ printk(KERN_NOTICE "COMM=%s PID=%d\n",
+ current->comm, current->pid);
+ else
+ printk(KERN_NOTICE "COMM= invalid\n");
+
+ if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
+ printk(KERN_NOTICE "TEXT = 0x%p-0x%p DATA = 0x%p-0x%p\n"
+ KERN_NOTICE " BSS = 0x%p-0x%p USER-STACK = 0x%p\n"
+ KERN_NOTICE "\n",
+ (void *)current->mm->start_code,
+ (void *)current->mm->end_code,
+ (void *)current->mm->start_data,
+ (void *)current->mm->end_data,
+ (void *)current->mm->end_data,
+ (void *)current->mm->brk,
+ (void *)current->mm->start_stack);
+ else
+ printk(KERN_NOTICE "invalid mm\n");
} else
printk(KERN_NOTICE "\n" KERN_NOTICE
"No Valid process in current context\n");
@@ -680,10 +705,7 @@ void dump_bfin_mem(struct pt_regs *fp)
unsigned short *addr, *erraddr, val = 0, err = 0;
char sti = 0, buf[6];
- if (unlikely((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR))
- erraddr = (void *)fp->pc;
- else
- erraddr = (void *)fp->retx;
+ erraddr = (void *)fp->pc;
printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
@@ -807,9 +829,9 @@ unlock:
if (((long)fp->seqstat & SEQSTAT_EXCAUSE) &&
(((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
- decode_address(buf, bfin_read_DCPLB_FAULT_ADDR());
+ decode_address(buf, saved_dcplb_fault_addr);
printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
- decode_address(buf, bfin_read_ICPLB_FAULT_ADDR());
+ decode_address(buf, saved_icplb_fault_addr);
printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
}
@@ -917,8 +939,8 @@ void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
oops_in_progress = 1;
- printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", (void *)bfin_read_DCPLB_FAULT_ADDR());
- printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", (void *)bfin_read_ICPLB_FAULT_ADDR());
+ printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", saved_dcplb_fault_addr);
+ printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", saved_icplb_fault_addr);
dump_bfin_process(fp);
dump_bfin_mem(fp);
show_regs(fp);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-19 04:58:02 +0000