arm64: Make the user fault reporting more specific
For user space faults the kernel reports "unhandled page fault" and it
gives the ESR value. With this patch the error message looked up in the
fault info array to give a better description.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 1909a69..afadae6 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -36,6 +36,8 @@
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
+static const char *fault_name(unsigned int esr);
+
/*
* Dump out the page tables associated with 'addr' in mm 'mm'.
*/
@@ -112,8 +114,9 @@
struct siginfo si;
if (show_unhandled_signals) {
- pr_info("%s[%d]: unhandled page fault (%d) at 0x%08lx, code 0x%03x\n",
- tsk->comm, task_pid_nr(tsk), sig, addr, esr);
+ pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
+ tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
+ addr, esr);
show_pte(tsk->mm, addr);
show_regs(regs);
}
@@ -450,6 +453,12 @@
{ do_bad, SIGBUS, 0, "unknown 63" },
};
+static const char *fault_name(unsigned int esr)
+{
+ const struct fault_info *inf = fault_info + (esr & 63);
+ return inf->name;
+}
+
/*
* Dispatch a data abort to the relevant handler.
*/