From 7b2bcbf59d9eaa5123765fcc9640b7bbd4180e4f Mon Sep 17 00:00:00 2001
From: John Gilmore <gnu@cygnus>
Date: Tue, 11 Jan 1994 07:45:48 +0000
Subject: * a29k-tdep.c (examine_prologue):  Don't worry if the ASGEQ stack
 overflow check isn't right after the register stack adjustment instruction. 
 Metaware R2.3u compiler moves other things in front of it.  This fix isn't
 perfect but is what's running.

---
 gdb/a29k-tdep.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

(limited to 'gdb/a29k-tdep.c')

diff --git a/gdb/a29k-tdep.c b/gdb/a29k-tdep.c
index 88b630a..20e9d53 100644
--- a/gdb/a29k-tdep.c
+++ b/gdb/a29k-tdep.c
@@ -1,5 +1,5 @@
 /* Target-machine dependent code for the AMD 29000
-   Copyright 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
+   Copyright 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
    Contributed by Cygnus Support.  Written by Jim Kingdon.
 
 This file is part of GDB.
@@ -149,17 +149,18 @@ examine_prologue (pc, rsize, msize, mfp_used)
     }
   p += 4;
 
-  /* Next instruction must be asgeu V_SPILL,gr1,rab.  
+  /* Next instruction ought to be asgeu V_SPILL,gr1,rab.  
    * We don't check the vector number to allow for kernel debugging.  The 
    * kernel will use a different trap number. 
+   * If this insn is missing, we just keep going; Metaware R2.3u compiler
+   * generates prologue that intermixes initializations and puts the asgeu
+   * way down.
    */
   insn = read_memory_integer (p, 4);
-  if ((insn & 0xff00ffff) != (0x5e000100|RAB_HW_REGNUM))
+  if ((insn & 0xff00ffff) == (0x5e000100|RAB_HW_REGNUM))
     {
-      p = pc;
-      goto done;
+      p += 4;
     }
-  p += 4;
 
   /* Next instruction usually sets the frame pointer (lr1) by adding
      <size * 4> from gr1.  However, this can (and high C does) be
@@ -271,6 +272,19 @@ examine_prologue (pc, rsize, msize, mfp_used)
 	}
     }
 
+  /* Next instruction might be asgeu V_SPILL,gr1,rab.  
+   * We don't check the vector number to allow for kernel debugging.  The 
+   * kernel will use a different trap number. 
+   * Metaware R2.3u compiler
+   * generates prologue that intermixes initializations and puts the asgeu
+   * way down after everything else.
+   */
+  insn = read_memory_integer (p, 4);
+  if ((insn & 0xff00ffff) == (0x5e000100|RAB_HW_REGNUM))
+    {
+      p += 4;
+    }
+
  done:
   if (msymbol != NULL)
     {
-- 
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