[PATCH 5/8] Detect a frameless frame by comparing the FP register to -1.

[John Baldwin <jhb@FreeBSD.org>]

Since CORE_ADDR is unsigned, the saved FP register is always greater than
or equal to zero.  Comparing to -1 results in a direct comparison with the
value used to initialize the saved FP register to an uninitialized state.
---
 gdb/ChangeLog   | 5 +++++
 gdb/sh64-tdep.c | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 73f42e2..243b717 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,10 @@
 2016-06-11  John Baldwin  <jhb@FreeBSD.org>
 
+	* sh64-tdep.c (sh64_analyze_prologue): Compare FP register against
+	-1 to detect missing FP.
+
+2016-06-11  John Baldwin  <jhb@FreeBSD.org>
+
 	* score-tdep.c (score7_malloc_and_get_memblock): Remove check for
 	negative size.
 
diff --git a/gdb/sh64-tdep.c b/gdb/sh64-tdep.c
index e6b1e27..f5a6504 100644
--- a/gdb/sh64-tdep.c
+++ b/gdb/sh64-tdep.c
@@ -971,7 +971,7 @@ sh64_analyze_prologue (struct gdbarch *gdbarch,
 	}
     }
 
-  if (cache->saved_regs[MEDIA_FP_REGNUM] >= 0)
+  if (cache->saved_regs[MEDIA_FP_REGNUM] == -1)
     cache->uses_fp = 1;
 }
 
-- 
2.7.0