gdb/

* arm-tdep.c (thumb_analyze_prologue): Always fallback on the SP
register when the frame can't be determined.
* arm-tdep.c (arm_analyze_prologue): Ditto.

gdb/testsuite/
* gdb.arch/thumb-prologue.c (switch_stack_to_same): New test function.
(switch_stack_to_other): New test function.
* gdb.arch/thumb-prologue.exp: New test cases.

1 files changed, 2 insertions, 14 deletions

diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index 3337248..4cd11d4 100644
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -1152,18 +1152,12 @@ thumb_analyze_prologue (struct gdbarch *gdbarch,
       cache->framereg = THUMB_FP_REGNUM;
       cache->framesize = -regs[THUMB_FP_REGNUM].k;
     }
-  else if (pv_is_register (regs[ARM_SP_REGNUM], ARM_SP_REGNUM))
+  else
     {
       /* Try the stack pointer... this is a bit desperate.  */
       cache->framereg = ARM_SP_REGNUM;
       cache->framesize = -regs[ARM_SP_REGNUM].k;
     }
-  else
-    {
-      /* We're just out of luck.  We don't know where the frame is.  */
-      cache->framereg = -1;
-      cache->framesize = 0;
-    }
 
   for (i = 0; i < 16; i++)
     if (pv_area_find_reg (stack, gdbarch, i, &offset))
@@ -1883,18 +1877,12 @@ arm_analyze_prologue (struct gdbarch *gdbarch,
       framereg = ARM_FP_REGNUM;
       framesize = -regs[ARM_FP_REGNUM].k;
     }
-  else if (pv_is_register (regs[ARM_SP_REGNUM], ARM_SP_REGNUM))
+  else
     {
       /* Try the stack pointer... this is a bit desperate.  */
       framereg = ARM_SP_REGNUM;
       framesize = -regs[ARM_SP_REGNUM].k;
     }
-  else
-    {
-      /* We're just out of luck.  We don't know where the frame is.  */
-      framereg = -1;
-      framesize = 0;
-    }
 
   if (cache)
     {