[PATCH] Fix CFI interpretation for locations on DW_CFA_*_loc boundaries

Milian Wolff milian.wolff@kdab.com
Thu Nov 1 08:49:00 GMT 2018


According to the DWARF v3 standard §6.4.3 3., all call frame
instructions up to L1 <= L2 should be interpreted for an FDE.
Elfutils currently only interprets L1 < L2, potentially missing
some instructions when L1 directly points at a DW_CFA_*_loc boundary.

This patch changes the behavior and makes elfutils behave like
libunwind in that regard.
---
 libdw/cfi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libdw/cfi.c b/libdw/cfi.c
index 341e055b..332c6b8b 100644
--- a/libdw/cfi.c
+++ b/libdw/cfi.c
@@ -125,7 +125,7 @@ execute_cfi (Dwarf_CFI *cache,
     fs->regs[regno].value = (r_value);			\
   } while (0)
 
-  while (program < end)
+  while (program <= end)
     {
       uint8_t opcode = *program++;
       Dwarf_Word regno;
-- 
2.19.1



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