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authorChristophe Leroy <christophe.leroy@c-s.fr>2019-08-21 15:21:55 +0000
committerMichael Ellerman <mpe@ellerman.id.au>2019-11-18 22:27:51 +1100
commit46ddcb3950a28c0df4815e8dbb8d4b91d5d9f22d (patch)
tree3bc0f24c22f19196f817336e1eacc8d2dc997ab9 /arch/powerpc
parentc4028fa2daa059ac9231ab3a4f57cbae814b3625 (diff)
powerpc/mm: Show if a bad page fault on data is read or write.
DSISR (or ESR on some CPUs) has a bit to tell if the fault is due to a read or a write. Display it. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Santosh Sivaraj <santosh@fossix.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/4f88d7e6fda53b5f80a71040ab400242f6c8cb93.1566400889.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/mm/fault.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 8432c281de92..b5047f9b5dec 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -645,6 +645,7 @@ NOKPROBE_SYMBOL(do_page_fault);
void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig)
{
const struct exception_table_entry *entry;
+ int is_write = page_fault_is_write(regs->dsisr);
/* Are we prepared to handle this fault? */
if ((entry = search_exception_tables(regs->nip)) != NULL) {
@@ -658,9 +659,10 @@ void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig)
case 0x300:
case 0x380:
case 0xe00:
- pr_alert("BUG: %s at 0x%08lx\n",
+ pr_alert("BUG: %s on %s at 0x%08lx\n",
regs->dar < PAGE_SIZE ? "Kernel NULL pointer dereference" :
- "Unable to handle kernel data access", regs->dar);
+ "Unable to handle kernel data access",
+ is_write ? "write" : "read", regs->dar);
break;
case 0x400:
case 0x480: