Old MIPS patch [drow@mvista.com: Re: Missing .cprestore warning]

[Daniel Jacobowitz <drow at mvista dot com>]

In searching through my archives, I noticed this MIPS patch.  Eric, is
this OK?  It warns about certain obviously-bogus missing directives.

----- Forwarded message from Daniel Jacobowitz <drow@mvista.com> -----

Date: Thu, 23 Aug 2001 11:03:54 -0700
From: Daniel Jacobowitz <drow@mvista.com>
Subject: Re: Missing .cprestore warning
To: Richard Henderson <rth@redhat.com>
Cc: binutils@sources.redhat.com

On Tue, Aug 14, 2001 at 05:43:00PM -0700, Richard Henderson wrote:
> On Tue, Aug 14, 2001 at 01:20:56PM -0700, Daniel Jacobowitz wrote:
> > Is there another logical place we could reset this?  Perhaps in .end?
> 
> That sounds ideal.

How about this patch, then?  This catches all the stupid mistakes I
made while working on giving _mcount a stack frame properly.

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer

2001-08-23  Daniel Jacobowitz  <drow@mvista.com>

	* tc-mips.c (mips_cprestore_valid): New flag.
	(mips_frame_reg_valid): New flag.
	(macro) [M_JAL_2]: Check both flags.
	[M_JAL_A]: Likewise.
	(s_cprestore): Set mips_cprestore_valid.
	(tc_get_register): If setting mips_frame_reg, set
	mips_frame_reg_valid and clear mips_cprestore_valid.
	(s_mips_ent): Clear both flags.
	(s_mips_end): Clear both flags.

Index: tc-mips.c
===================================================================
RCS file: /cvs/src/src/gas/config/tc-mips.c,v
retrieving revision 1.68
diff -u -p -r1.68 tc-mips.c
--- tc-mips.c	2001/08/21 01:13:05	1.68
+++ tc-mips.c	2001/08/23 17:56:41
@@ -414,10 +414,18 @@ static int auto_align = 1;
    variable.  */
 static offsetT mips_cprestore_offset = -1;
 
+/* Whether mips_cprestore_offset has been set in the current function
+   (or whether it has already been warned about, if not).  */
+static int mips_cprestore_valid = 0;
+
 /* This is the register which holds the stack frame, as set by the
    .frame pseudo-op.  This is needed to implement .cprestore.  */
 static int mips_frame_reg = SP;
 
+/* Whether mips_frame_reg has been set in the current function
+   (or whether it has already been warned about, if not).  */
+static int mips_frame_reg_valid = 0;
+
 /* To output NOP instructions correctly, we need to keep information
    about the previous two instructions.  */
 
@@ -4654,6 +4662,18 @@ macro (ip)
 	    as_warn (_("No .cprestore pseudo-op used in PIC code"));
 	  else
 	    {
+	      if (! mips_frame_reg_valid)
+		{
+		  as_warn (_("No .frame pseudo-op used in PIC code"));
+		  /* Quiet this warning.  */
+		  mips_frame_reg_valid = 1;
+		}
+	      if (! mips_cprestore_valid)
+		{
+		  as_warn (_("No .cprestore pseudo-op used in PIC code"));
+		  /* Quiet this warning.  */
+		  mips_cprestore_valid = 1;
+		}
 	      expr1.X_add_number = mips_cprestore_offset;
 	      macro_build ((char *) NULL, &icnt, &expr1,
 			   HAVE_32BIT_ADDRESSES ? "lw" : "ld",
@@ -4754,6 +4774,18 @@ macro (ip)
 	    as_warn (_("No .cprestore pseudo-op used in PIC code"));
 	  else
 	    {
+	      if (! mips_frame_reg_valid)
+		{
+		  as_warn (_("No .frame pseudo-op used in PIC code"));
+		  /* Quiet this warning.  */
+		  mips_frame_reg_valid = 1;
+		}
+	      if (! mips_cprestore_valid)
+		{
+		  as_warn (_("No .cprestore pseudo-op used in PIC code"));
+		  /* Quiet this warning.  */
+		  mips_cprestore_valid = 1;
+		}
 	      if (mips_opts.noreorder)
 		macro_build ((char *) NULL, &icnt, (expressionS *) NULL,
 			     "nop", "");
@@ -10537,6 +10569,7 @@ s_cprestore (ignore)
     }
 
   mips_cprestore_offset = get_absolute_expression ();
+  mips_cprestore_valid = 1;
 
   ex.X_op = O_constant;
   ex.X_add_symbol = NULL;
@@ -10743,7 +10776,11 @@ tc_get_register (frame)
       input_line_pointer += 2;
     }
   if (frame)
-    mips_frame_reg = reg != 0 ? reg : SP;
+    {
+      mips_frame_reg = reg != 0 ? reg : SP;
+      mips_frame_reg_valid = 1;
+      mips_cprestore_valid = 0;
+    }
   return reg;
 }
 
@@ -11798,6 +11835,10 @@ s_mips_end (x)
   symbolS *p;
   int maybe_text;
 
+  /* Following functions need their own .frame and .cprestore directives.  */
+  mips_frame_reg_valid = 0;
+  mips_cprestore_valid = 0;
+
   if (!is_end_of_line[(unsigned char) *input_line_pointer])
     {
       p = get_symbol ();
@@ -11915,6 +11956,10 @@ s_mips_ent (aent)
 
   if (!aent)
     {
+      /* This function needs its own .frame and .cprestore directives.  */
+      mips_frame_reg_valid = 0;
+      mips_cprestore_valid = 0;
+
       cur_proc_ptr = &cur_proc;
       memset (cur_proc_ptr, '\0', sizeof (procS));
 


----- End forwarded message -----

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer