x86/unwind: Show function name+offset in ORC error messages

Improve the warning messages to show the relevant function name+offset.
This makes it much easier to diagnose problems with the ORC metadata.

Before:

  WARNING: can't dereference iret registers at ffff8801c5f17fe0 for ip ffffffff95f0d94b

After:

  WARNING: can't dereference iret registers at ffff880178f5ffe0 for ip int3+0x5b/0x60

Reported-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: ee9f8fce9964 ("x86/unwind: Add the ORC unwinder")
Link: http://lkml.kernel.org/r/6bada6b9eac86017e16bd79e1e77877935cb50bb.1508516398.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 15 insertions, 14 deletions

diff --git a/arch/x86/kernel/unwind_orc.c b/arch/x86/kernel/unwind_orc.c
index 570b70d3f604..b95007e7c1b3 100644
--- a/arch/x86/kernel/unwind_orc.c
+++ b/arch/x86/kernel/unwind_orc.c
@@ -86,8 +86,8 @@ static struct orc_entry *orc_find(unsigned long ip)
                 idx = (ip - LOOKUP_START_IP) / LOOKUP_BLOCK_SIZE;
 
                 if (unlikely((idx >= lookup_num_blocks-1))) {
-                        orc_warn("WARNING: bad lookup idx: idx=%u num=%u ip=%lx\n",
-                                 idx, lookup_num_blocks, ip);
+                        orc_warn("WARNING: bad lookup idx: idx=%u num=%u ip=%pB\n",
+                                 idx, lookup_num_blocks, (void *)ip);
                         return NULL;
                 }
 
@@ -96,8 +96,8 @@ static struct orc_entry *orc_find(unsigned long ip)
 
                 if (unlikely((__start_orc_unwind + start >= __stop_orc_unwind) ||
                              (__start_orc_unwind + stop > __stop_orc_unwind))) {
-                        orc_warn("WARNING: bad lookup value: idx=%u num=%u start=%u stop=%u ip=%lx\n",
-                                 idx, lookup_num_blocks, start, stop, ip);
+                        orc_warn("WARNING: bad lookup value: idx=%u num=%u start=%u stop=%u ip=%pB\n",
+                                 idx, lookup_num_blocks, start, stop, (void *)ip);
                         return NULL;
                 }
 
@@ -373,7 +373,7 @@ bool unwind_next_frame(struct unwind_state *state)
 
         case ORC_REG_R10:
                 if (!state->regs || !state->full_regs) {
-                        orc_warn("missing regs for base reg R10 at ip %p\n",
+                        orc_warn("missing regs for base reg R10 at ip %pB\n",
                                  (void *)state->ip);
                         goto done;
                 }
@@ -382,7 +382,7 @@ bool unwind_next_frame(struct unwind_state *state)
 
         case ORC_REG_R13:
                 if (!state->regs || !state->full_regs) {
-                        orc_warn("missing regs for base reg R13 at ip %p\n",
+                        orc_warn("missing regs for base reg R13 at ip %pB\n",
                                  (void *)state->ip);
                         goto done;
                 }
@@ -391,7 +391,7 @@ bool unwind_next_frame(struct unwind_state *state)
 
         case ORC_REG_DI:
                 if (!state->regs || !state->full_regs) {
-                        orc_warn("missing regs for base reg DI at ip %p\n",
+                        orc_warn("missing regs for base reg DI at ip %pB\n",
                                  (void *)state->ip);
                         goto done;
                 }
@@ -400,7 +400,7 @@ bool unwind_next_frame(struct unwind_state *state)
 
         case ORC_REG_DX:
                 if (!state->regs || !state->full_regs) {
-                        orc_warn("missing regs for base reg DX at ip %p\n",
+                        orc_warn("missing regs for base reg DX at ip %pB\n",
                                  (void *)state->ip);
                         goto done;
                 }
@@ -408,7 +408,7 @@ bool unwind_next_frame(struct unwind_state *state)
                 break;
 
         default:
-                orc_warn("unknown SP base reg %d for ip %p\n",
+                orc_warn("unknown SP base reg %d for ip %pB\n",
                          orc->sp_reg, (void *)state->ip);
                 goto done;
         }
@@ -436,7 +436,7 @@ bool unwind_next_frame(struct unwind_state *state)
 
         case ORC_TYPE_REGS:
                 if (!deref_stack_regs(state, sp, &state->ip, &state->sp, true)) {
-                        orc_warn("can't dereference registers at %p for ip %p\n",
+                        orc_warn("can't dereference registers at %p for ip %pB\n",
                                  (void *)sp, (void *)orig_ip);
                         goto done;
                 }
@@ -448,7 +448,7 @@ bool unwind_next_frame(struct unwind_state *state)
 
         case ORC_TYPE_REGS_IRET:
                 if (!deref_stack_regs(state, sp, &state->ip, &state->sp, false)) {
-                        orc_warn("can't dereference iret registers at %p for ip %p\n",
+                        orc_warn("can't dereference iret registers at %p for ip %pB\n",
                                  (void *)sp, (void *)orig_ip);
                         goto done;
                 }
@@ -465,7 +465,8 @@ bool unwind_next_frame(struct unwind_state *state)
                 break;
 
         default:
-                orc_warn("unknown .orc_unwind entry type %d\n", orc->type);
+                orc_warn("unknown .orc_unwind entry type %d for ip %pB\n",
+                         orc->type, (void *)orig_ip);
                 break;
         }
 
@@ -487,7 +488,7 @@ bool unwind_next_frame(struct unwind_state *state)
                 break;
 
         default:
-                orc_warn("unknown BP base reg %d for ip %p\n",
+                orc_warn("unknown BP base reg %d for ip %pB\n",
                          orc->bp_reg, (void *)orig_ip);
                 goto done;
         }
@@ -496,7 +497,7 @@ bool unwind_next_frame(struct unwind_state *state)
         if (state->stack_info.type == prev_type &&
             on_stack(&state->stack_info, (void *)state->sp, sizeof(long)) &&
             state->sp <= prev_sp) {
-                orc_warn("stack going in the wrong direction? ip=%p\n",
+                orc_warn("stack going in the wrong direction? ip=%pB\n",
                          (void *)orig_ip);
                 goto done;
         }