From 430923f3fa448bb555c0273d9d66260fb5c59308 Mon Sep 17 00:00:00 2001
From: John Gilmore <gnu@cygnus>
Date: Thu, 14 Nov 1991 21:20:12 +0000
Subject: [PATCH] * m88k-tdep.c (examine_prologue):  Deal with OR instructions
 that shuffle parameters into other regs. * symtab.c (decode_line_1):  Fix bug
 introduced in Per's change of Nov 12th.

---
 gdb/ChangeLog   |  7 +++++++
 gdb/m88k-tdep.c | 28 ++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 48662d53eac..a80c8e2943e 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,10 @@
+Thu Nov 14 13:18:25 1991  John Gilmore  (gnu at cygnus.com)
+
+	* m88k-tdep.c (examine_prologue):  Deal with OR instructions
+	that shuffle parameters into other regs.
+	* symtab.c (decode_line_1):  Fix bug introduced in Per's change
+	of Nov 12th.
+
 Wed Nov 13 19:51:11 1991  Steve Chamberlain  (sac at cygnus.com)
 
 	* Makefile.in, xconfig/delta88 made it install a sysV manual page;
diff --git a/gdb/m88k-tdep.c b/gdb/m88k-tdep.c
index 6d0ca8416a0..65e39f6b0a8 100644
--- a/gdb/m88k-tdep.c
+++ b/gdb/m88k-tdep.c
@@ -152,6 +152,8 @@ init_frame_pc (fromleaf, prev)
    (addu r30,r31,n)?			# frame pointer update
 
    (pic sequence)?			# PIC code prologue
+
+   (or   rn,rm,0)?			# Move parameters to other regs
 */
 
 /* Macros for extracting fields from instructions.  */
@@ -333,6 +335,32 @@ examine_prologue (ip, limit, frame_sp, fsr, fi)
       next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn1, &insn2);
     }
 
+  /* Accept moves of parameter registers to other registers, using
+     "or rd,rs,0" or "or.u rd,rs,0" or "or rd,r0,rs" or "or rd,rs,r0".
+     We don't have to worry about walking into the first lines of code,
+     since the first line number will stop us (assuming we have symbols).
+     What gcc actually seems to produce is "or rd,r0,rs".  */
+
+#define	OR_MOVE_INSN	0x58000000		/* or/or.u with immed of 0 */
+#define	OR_MOVE_MASK	0xF800FFFF
+#define	OR_REG_MOVE1_INSN	0xF4005800	/* or rd,r0,rs */
+#define	OR_REG_MOVE1_MASK	0xFC1FFFE0
+#define	OR_REG_MOVE2_INSN	0xF4005800	/* or rd,rs,r0 */
+#define	OR_REG_MOVE2_MASK	0xFC00FFFF
+  while (next_ip && 
+	 ((insn1 & OR_MOVE_MASK) == OR_MOVE_INSN ||
+	  (insn1 & OR_REG_MOVE1_MASK) == OR_REG_MOVE1_INSN ||
+	  (insn1 & OR_REG_MOVE2_MASK) == OR_REG_MOVE2_INSN
+	 )
+	)
+    {
+      /* We don't care what moves to where.  The result of the moves 
+ 	 has already been reflected in what the compiler tells us is the
+	 location of these parameters.  */
+      ip = next_ip;
+      next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn1, &insn2);
+    }
+
   /* We're done with the prologue.  If we don't care about the stack
      frame itself, just return.  (Note that fsr->regs has been trashed,
      but the one caller who calls with fi==0 passes a dummy there.)  */
-- 
2.30.2