From 6b538db7c6b091960c57b23feae5431fc82286e7 Mon Sep 17 00:00:00 2001
From: Vineet Gupta <vgupta@synopsys.com>
Date: Mon, 21 Dec 2015 13:52:01 +0530
Subject: ARC: dw2 unwind: Catch Dwarf SNAFUs early
Instead of seeing empty stack traces, let kernel fail early so dwarf
issues can be fixed sooner
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
arch/arc/kernel/unwind.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
(limited to 'arch/arc')
diff --git a/arch/arc/kernel/unwind.c b/arch/arc/kernel/unwind.c
index f34599abe182..5eb707640e9c 100644
--- a/arch/arc/kernel/unwind.c
+++ b/arch/arc/kernel/unwind.c
@@ -296,10 +296,10 @@ static void init_unwind_hdr(struct unwind_table *table,
if (cie == ¬_fde)
continue;
if (cie == NULL || cie == &bad_cie)
- return;
+ goto ret_err;
ptrType = fde_pointer_type(cie);
if (ptrType < 0)
- return;
+ goto ret_err;
ptr = (const u8 *)(fde + 2);
if (!read_pointer(&ptr, (const u8 *)(fde + 1) + *fde,
@@ -315,14 +315,14 @@ static void init_unwind_hdr(struct unwind_table *table,
}
if (tableSize || !n)
- return;
+ goto ret_err;
hdrSize = 4 + sizeof(unsigned long) + sizeof(unsigned int)
+ 2 * n * sizeof(unsigned long);
header = alloc(hdrSize);
if (!header)
- return;
+ goto ret_err;
header->version = 1;
header->eh_frame_ptr_enc = DW_EH_PE_abs | DW_EH_PE_native;
@@ -361,6 +361,10 @@ static void init_unwind_hdr(struct unwind_table *table,
table->hdrsz = hdrSize;
smp_wmb();
table->header = (const void *)header;
+ return;
+
+ret_err:
+ panic("Attention !!! Dwarf FDE parsing errors\n");;
}
#ifdef CONFIG_MODULES
--
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