[RFA/RFC/IRIX] Remove some deprecated_registers from irix5-nat.c

[Joel Brobecker <brobecker@gnat.com>]

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Hello,

Here is a patch that removes most of the uses of deprecated_registers
in irix5-nat.c. I am not too familiar with the regcache yet, I hope
I got it right. There was also a small issue with type size, where
I introduced a temporary (regval) to make sure that the buffer given
to regcache_raw_read_signed would always be large enough. Not sure
whether it was the best way to do it (this shows my lack of C knowledge).

2004-11-13  Joel Brobecker  <brobecker@gnat.com>

        * irix5-nat.c (fill_gregset): Replace use of deprecated_registers
        with equivalent code.
        (fill_fpregset): Likewise.

Tested on mips-irix. There is an occasional screwup during the execution
of gdb.threads/killed.exp that causes the testsuite to abort before the
end:

        ERROR: (DejaGnu) proc "(gdb) {$}" does not exist.
        The error code is NONE
        The info on the error is:
        close: invalid spawn id (8)
            while executing
        "close -i 8"
            invoked from within
        "catch "close -i $spawn_id""

Given that the testsuite takes a fair bit of time to run on our
IRIX machine, and given that it can happen several times in a row
before I get a clean run, I am reluctant to retry.

So it's a bit more difficult to compare the two testsuite results.
But I verified that we didn't have any change in all the testsuite
up until this point.

OK to apply?

The last couple of uses of deprecated_registers will be removed shortly.
I decided to handle them separately because they are used when loading
the registers from a core file. I wanted to evaluate the attached change
first.

Thanks,
-- 
Joel

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Index: irix5-nat.c
===================================================================
RCS file: /cvs/src/src/gdb/irix5-nat.c,v
retrieving revision 1.35
diff -u -p -r1.35 irix5-nat.c
--- irix5-nat.c	30 Oct 2004 22:36:34 -0000	1.35
+++ irix5-nat.c	13 Nov 2004 22:33:07 -0000
@@ -83,6 +83,7 @@ fill_gregset (gregset_t *gregsetp, int r
 {
   int regi;
   greg_t *regp = &(*gregsetp)[0];
+  LONGEST regval;
 
   /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32
      executable, we have to sign extend the registers to 64 bits before
@@ -90,30 +91,39 @@ fill_gregset (gregset_t *gregsetp, int r
 
   for (regi = 0; regi <= CTX_RA; regi++)
     if ((regno == -1) || (regno == regi))
-      *(regp + regi) =
-	extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (regi)],
-				register_size (current_gdbarch, regi));
+      {
+        regcache_raw_read_signed (current_regcache, regi, &regval);
+        *(regp + regi) = regval;
+      }
 
   if ((regno == -1) || (regno == PC_REGNUM))
-    *(regp + CTX_EPC) =
-      extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->pc)],
-			      register_size (current_gdbarch, mips_regnum (current_gdbarch)->pc));
+    {
+      regcache_raw_read_signed
+        (current_regcache, mips_regnum (current_gdbarch)->pc, &regval);
+      *(regp + CTX_EPC) = regval;
+    }
 
   if ((regno == -1) || (regno == mips_regnum (current_gdbarch)->cause))
-    *(regp + CTX_CAUSE) =
-      extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->cause)],
-			      register_size (current_gdbarch, mips_regnum (current_gdbarch)->cause));
+    {
+      regcache_raw_read_signed
+        (current_regcache, mips_regnum (current_gdbarch)->cause, &regval);
+      *(regp + CTX_CAUSE) = regval;
+    }
 
   if ((regno == -1)
       || (regno == mips_regnum (current_gdbarch)->hi))
-    *(regp + CTX_MDHI) =
-      extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->hi)],
-			      register_size (current_gdbarch, mips_regnum (current_gdbarch)->hi));
+    {
+      regcache_raw_read_signed
+        (current_regcache, mips_regnum (current_gdbarch)->hi, &regval);
+      *(regp + CTX_MDHI) = regval;
+    }
 
   if ((regno == -1) || (regno == mips_regnum (current_gdbarch)->lo))
-    *(regp + CTX_MDLO) =
-      extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->lo)],
-			      register_size (current_gdbarch, mips_regnum (current_gdbarch)->lo));
+    {
+      regcache_raw_read_signed
+        (current_regcache, mips_regnum (current_gdbarch)->lo, &regval);
+      *(regp + CTX_MDLO) = regval;
+    }
 }
 
 /*
@@ -158,15 +168,16 @@ fill_fpregset (fpregset_t *fpregsetp, in
     {
       if ((regno == -1) || (regno == regi))
 	{
-	  from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regi)];
 	  to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
-	  memcpy (to, from, register_size (current_gdbarch, regi));
+          regcache_raw_read (current_regcache, regi, to);
 	}
     }
 
   if ((regno == -1)
       || (regno == mips_regnum (current_gdbarch)->fp_control_status))
-    fpregsetp->fp_csr = *(unsigned *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->fp_control_status)];
+    regcache_raw_read (current_regcache,
+                       mips_regnum (current_gdbarch)->fp_control_status, 
+                       &fpregsetp->fp_csr);
 }