* spu-tdep.c (spu_analyze_prologue): Track instruction to

	store backchain as part of prologue.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 2f5bbdf..c41c38d 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2010-03-02  Ulrich Weigand  <uweigand@de.ibm.com>
+
+       * spu-tdep.c (spu_analyze_prologue): Track instruction to
+       store backchain as part of prologue.
+
 2010-03-02  Daniel Jacobowitz  <dan@codesourcery.com>
 
        * progspace.c (update_address_spaces): Update inferior address spaces

diff --git a/gdb/spu-tdep.c b/gdb/spu-tdep.c
index c6db8dc..269ad28 100644 (file)
--- a/gdb/spu-tdep.c
+++ b/gdb/spu-tdep.c
@@ -633,6 +633,7 @@ spu_analyze_prologue (struct gdbarch *gdbarch,
   int found_sp = 0;
   int found_fp = 0;
   int found_lr = 0;
+  int found_bc = 0;
   int reg_immed[SPU_NUM_GPRS];
   gdb_byte buf[16];
   CORE_ADDR prolog_pc = start_pc;
@@ -661,8 +662,9 @@ spu_analyze_prologue (struct gdbarch *gdbarch,
        - The first instruction to set up the stack pointer.
        - The first instruction to set up the frame pointer.
        - The first instruction to save the link register.
+       - The first instruction to save the backchain.
 
-     We return the instruction after the latest of these three,
+     We return the instruction after the latest of these four,
      or the incoming PC if none is found.  The first instruction
      to set up the stack pointer also defines the frame size.
 
@@ -771,6 +773,14 @@ spu_analyze_prologue (struct gdbarch *gdbarch,
              found_lr = 1;
              prolog_pc = pc + 4;
            }
+
+         if (ra == SPU_RAW_SP_REGNUM
+             && (found_sp? immed == 0 : rt == SPU_RAW_SP_REGNUM)
+             && !found_bc)
+           {
+             found_bc = 1;
+             prolog_pc = pc + 4;
+           }
        }
 
       /* _start uses SELB to set up the stack pointer.  */