[PATCH] Lookup the JIT descriptor symbol first to avoid finding the PLT entry of the breakpoint in the wrong object file.

Yichao Yu yyc1992@gmail.com
Thu Jan 26 20:24:00 GMT 2017


Fix 20633
---
 gdb/jit.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/gdb/jit.c b/gdb/jit.c
index 158d6d8..d6eb800 100644
--- a/gdb/jit.c
+++ b/gdb/jit.c
@@ -1051,18 +1051,21 @@ jit_breakpoint_re_set_internal (struct gdbarch *gdbarch,
   if (ps_data->objfile == NULL)
     {
       /* Lookup the registration symbol.  If it is missing, then we
-	 assume we are not attached to a JIT.  */
-      reg_symbol = lookup_minimal_symbol_and_objfile (jit_break_name);
-      if (reg_symbol.minsym == NULL
-	  || BMSYMBOL_VALUE_ADDRESS (reg_symbol) == 0)
-	return 1;
+	 assume we are not attached to a JIT.
+	 Lookup the descriptor first since looking up the breakpoint might
+	 return a PLT entry in the wrong file.  */
 
-      desc_symbol = lookup_minimal_symbol (jit_descriptor_name, NULL,
-					   reg_symbol.objfile);
+      desc_symbol = lookup_minimal_symbol_and_objfile (jit_descriptor_name);
       if (desc_symbol.minsym == NULL
 	  || BMSYMBOL_VALUE_ADDRESS (desc_symbol) == 0)
 	return 1;
 
+      reg_symbol = lookup_minimal_symbol (jit_break_name, NULL,
+					  desc_symbol.objfile);
+      if (reg_symbol.minsym == NULL
+	  || BMSYMBOL_VALUE_ADDRESS (reg_symbol) == 0)
+	return 1;
+
       objf_data = get_jit_objfile_data (reg_symbol.objfile);
       objf_data->register_code = reg_symbol.minsym;
       objf_data->descriptor = desc_symbol.minsym;
-- 
2.10.2



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