summaryrefslogtreecommitdiffstats
path: root/arch/mips/mm/fault.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/mm/fault.c')
-rw-r--r--arch/mips/mm/fault.c29
1 files changed, 20 insertions, 9 deletions
diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c
index 70ab5d6..7ff8637 100644
--- a/arch/mips/mm/fault.c
+++ b/arch/mips/mm/fault.c
@@ -14,6 +14,7 @@
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
+#include <linux/ratelimit.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/smp.h>
@@ -28,6 +29,8 @@
#include <asm/highmem.h> /* For VMALLOC_END */
#include <linux/kdebug.h>
+int show_unhandled_signals = 1;
+
/*
* This routine handles page faults. It determines the address,
* and the problem, and then passes it off to one of the appropriate
@@ -44,6 +47,8 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
int fault;
unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
+ static DEFINE_RATELIMIT_STATE(ratelimit_state, 5 * HZ, 10);
+
#if 0
printk("Cpu%d[%s:%d:%0*lx:%ld:%0*lx]\n", raw_smp_processor_id(),
current->comm, current->pid, field, address, write,
@@ -203,15 +208,21 @@ bad_area_nosemaphore:
if (user_mode(regs)) {
tsk->thread.cp0_badvaddr = address;
tsk->thread.error_code = write;
-#if 0
- printk("do_page_fault() #2: sending SIGSEGV to %s for "
- "invalid %s\n%0*lx (epc == %0*lx, ra == %0*lx)\n",
- tsk->comm,
- write ? "write access to" : "read access from",
- field, address,
- field, (unsigned long) regs->cp0_epc,
- field, (unsigned long) regs->regs[31]);
-#endif
+ if (show_unhandled_signals &&
+ unhandled_signal(tsk, SIGSEGV) &&
+ __ratelimit(&ratelimit_state)) {
+ pr_info("\ndo_page_fault(): sending SIGSEGV to %s for invalid %s %0*lx",
+ tsk->comm,
+ write ? "write access to" : "read access from",
+ field, address);
+ pr_info("epc = %0*lx in", field,
+ (unsigned long) regs->cp0_epc);
+ print_vma_addr(" ", regs->cp0_epc);
+ pr_info("ra = %0*lx in", field,
+ (unsigned long) regs->regs[31]);
+ print_vma_addr(" ", regs->regs[31]);
+ pr_info("\n");
+ }
info.si_signo = SIGSEGV;
info.si_errno = 0;
/* info.si_code has been set above */
OpenPOWER on IntegriCloud